<?php
declare(strict_types=1);
session_start();
require_once 'db/config.php';

// Handle POST Requests
$message = '';

function numberToWordsOMR($number) {
    $number = number_format((float)$number, 3, '.', '');
    list($rials, $baisas) = explode('.', $number);
    
    $rialsWords = numberToWords((int)$rials);
    $baisasWords = numberToWords((int)$baisas);
    
    $result = $rialsWords . " Omani Rials";
    if ((int)$baisas > 0) {
        $result .= " and " . $baisasWords . " Baisas";
    }
    return $result . " Only";
}

function numberToWords($num) {
    $num = (int)$num;
    if ($num === 0) return "Zero";
    $ones = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"];
    $tens = ["", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"];
    if ($num < 20) return $ones[$num];
    if ($num < 100) return $tens[(int)($num / 10)] . ($num % 10 ? " " . $ones[$num % 10] : "");
    if ($num < 1000) return $ones[(int)($num / 100)] . " Hundred" . ($num % 100 ? " and " . numberToWords($num % 100) : "");
    if ($num < 1000000) return numberToWords((int)($num / 1000)) . " Thousand" . ($num % 1000 ? " " . numberToWords($num % 1000) : "");
    return (string)$num;
}

if ($_SERVER['REQUEST_METHOD'] === 'GET' && isset($_GET['action'])) {
    if ($_GET['action'] === 'search_items') {
        header('Content-Type: application/json');
        $q = $_GET['q'] ?? '';
        $stmt = db()->prepare("SELECT id, name_en, name_ar, sku, sale_price, purchase_price, stock_quantity, vat_rate FROM stock_items WHERE name_en LIKE ? OR name_ar LIKE ? OR sku LIKE ? LIMIT 10");
        $stmt->execute(["%$q%", "%$q%", "%$q%"]);
        echo json_encode($stmt->fetchAll());
        exit;
    }
    if ($_GET['action'] === 'get_payments') {
        header('Content-Type: application/json');
        $invoice_id = (int)$_GET['invoice_id'];
        $stmt = db()->prepare("SELECT p.*, i.id as inv_id, c.name as customer_name 
                                FROM payments p 
                                JOIN invoices i ON p.invoice_id = i.id 
                                LEFT JOIN customers c ON i.customer_id = c.id 
                                WHERE p.invoice_id = ? ORDER BY p.payment_date DESC, p.id DESC");
        $stmt->execute([$invoice_id]);
        $payments = $stmt->fetchAll(PDO::FETCH_ASSOC);
        foreach ($payments as &$p) {
            $p['amount_words'] = numberToWordsOMR($p['amount']);
        }
        echo json_encode($payments);
        exit;
    }
    if ($_GET['action'] === 'get_payment_details') {
        header('Content-Type: application/json');
        $payment_id = (int)$_GET['payment_id'];
        $stmt = db()->prepare("SELECT p.*, i.id as inv_id, c.name as customer_name 
                                FROM payments p 
                                JOIN invoices i ON p.invoice_id = i.id 
                                LEFT JOIN customers c ON i.customer_id = c.id 
                                WHERE p.id = ?");
        $stmt->execute([$payment_id]);
        $payment = $stmt->fetch(PDO::FETCH_ASSOC);
        if ($payment) {
            $payment['amount_words'] = numberToWordsOMR($payment['amount']);
        }
        echo json_encode($payment);
        exit;
    }
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_POST['add_customer'])) {
        $name = $_POST['name'] ?? '';
        $email = $_POST['email'] ?? '';
        $phone = $_POST['phone'] ?? '';
        $tax_id = $_POST['tax_id'] ?? '';
        $balance = (float)($_POST['balance'] ?? 0);
        $type = $_POST['type'] ?? 'customer';
        if ($name) {
            $stmt = db()->prepare("INSERT INTO customers (name, email, phone, tax_id, balance, type) VALUES (?, ?, ?, ?, ?, ?)");
            $stmt->execute([$name, $email, $phone, $tax_id, $balance, $type]);
            $message = ucfirst($type) . " added successfully!";
        }
    }

    if (isset($_POST['edit_customer'])) {
        $id = (int)$_POST['id'];
        $name = $_POST['name'] ?? '';
        $email = $_POST['email'] ?? '';
        $phone = $_POST['phone'] ?? '';
        $tax_id = $_POST['tax_id'] ?? '';
        $balance = (float)($_POST['balance'] ?? 0);
        if ($id && $name) {
            $stmt = db()->prepare("UPDATE customers SET name = ?, email = ?, phone = ?, tax_id = ?, balance = ? WHERE id = ?");
            $stmt->execute([$name, $email, $phone, $tax_id, $balance, $id]);
            $message = "Record updated successfully!";
        }
    }

    if (isset($_POST['delete_customer'])) {
        $id = (int)$_POST['id'];
        if ($id) {
            $stmt = db()->prepare("DELETE FROM customers WHERE id = ?");
            $stmt->execute([$id]);
            $message = "Record deleted successfully!";
        }
    }

    if (isset($_POST['add_category'])) {
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        if ($name_en && $name_ar) {
            $stmt = db()->prepare("INSERT INTO stock_categories (name_en, name_ar) VALUES (?, ?)");
            $stmt->execute([$name_en, $name_ar]);
            $message = "Category added successfully!";
        }
    }

    if (isset($_POST['add_unit'])) {
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        $short_en = $_POST['short_en'] ?? '';
        $short_ar = $_POST['short_ar'] ?? '';
        if ($name_en && $name_ar) {
            $stmt = db()->prepare("INSERT INTO stock_units (name_en, name_ar, short_name_en, short_name_ar) VALUES (?, ?, ?, ?)");
            $stmt->execute([$name_en, $name_ar, $short_en, $short_ar]);
            $message = "Unit added successfully!";
        }
    }

    if (isset($_POST['add_item'])) {
        $cat_id = $_POST['category_id'] ?: null;
        $unit_id = $_POST['unit_id'] ?: null;
        $supplier_id = $_POST['supplier_id'] ?: null;
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        $sku = $_POST['sku'] ?? '';
        $p_price = (float)($_POST['purchase_price'] ?? 0);
        $s_price = (float)($_POST['sale_price'] ?? 0);
        $qty = (float)($_POST['stock_quantity'] ?? 0);
        $min_stock = (float)($_POST['min_stock_level'] ?? 0);
        $vat_rate = (float)($_POST['vat_rate'] ?? 0);
        $expiry = $_POST['expiry_date'] ?: null;
        
        $image_path = null;
        if (isset($_FILES['image']) && $_FILES['image']['error'] === UPLOAD_ERR_OK) {
            $ext = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);
            $filename = uniqid('item_') . '.' . $ext;
            $target = 'uploads/items/' . $filename;
            if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {
                $image_path = $target;
            }
        }

        if ($name_en && $name_ar) {
            $stmt = db()->prepare("INSERT INTO stock_items (category_id, unit_id, supplier_id, name_en, name_ar, sku, purchase_price, sale_price, stock_quantity, min_stock_level, expiry_date, image_path, vat_rate) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
            $stmt->execute([$cat_id, $unit_id, $supplier_id, $name_en, $name_ar, $sku, $p_price, $s_price, $qty, $min_stock, $expiry, $image_path, $vat_rate]);
            $message = "Item added successfully!";
        }
    }

    if (isset($_POST['delete_item'])) {
        $id = (int)$_POST['id'];
        // Optional: delete image file
        $item = db()->prepare("SELECT image_path FROM stock_items WHERE id = ?");
        $item->execute([$id]);
        $path = $item->fetchColumn();
        if ($path && file_exists($path)) {
            unlink($path);
        }
        
        $stmt = db()->prepare("DELETE FROM stock_items WHERE id = ?");
        $stmt->execute([$id]);
        $message = "Item deleted successfully!";
    }

    if (isset($_POST['edit_item'])) {
        $id = (int)$_POST['id'];
        $cat_id = $_POST['category_id'] ?: null;
        $unit_id = $_POST['unit_id'] ?: null;
        $supplier_id = $_POST['supplier_id'] ?: null;
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        $sku = $_POST['sku'] ?? '';
        $p_price = (float)($_POST['purchase_price'] ?? 0);
        $s_price = (float)($_POST['sale_price'] ?? 0);
        $qty = (float)($_POST['stock_quantity'] ?? 0);
        $min_stock = (float)($_POST['min_stock_level'] ?? 0);
        $vat_rate = (float)($_POST['vat_rate'] ?? 0);
        $expiry = $_POST['expiry_date'] ?: null;

        $stmt = db()->prepare("SELECT image_path FROM stock_items WHERE id = ?");
        $stmt->execute([$id]);
        $image_path = $stmt->fetchColumn();

        if (isset($_FILES['image']) && $_FILES['image']['error'] === UPLOAD_ERR_OK) {
            // Delete old image
            if ($image_path && file_exists($image_path)) {
                unlink($image_path);
            }
            $ext = pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION);
            $filename = uniqid('item_') . '.' . $ext;
            $target = 'uploads/items/' . $filename;
            if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {
                $image_path = $target;
            }
        }

        if ($name_en && $name_ar) {
            $stmt = db()->prepare("UPDATE stock_items SET category_id = ?, unit_id = ?, supplier_id = ?, name_en = ?, name_ar = ?, sku = ?, purchase_price = ?, sale_price = ?, stock_quantity = ?, min_stock_level = ?, expiry_date = ?, image_path = ?, vat_rate = ? WHERE id = ?");
            $stmt->execute([$cat_id, $unit_id, $supplier_id, $name_en, $name_ar, $sku, $p_price, $s_price, $qty, $min_stock, $expiry, $image_path, $vat_rate, $id]);
            $message = "Item updated successfully!";
        }
    }

    if (isset($_POST['import_items'])) {
        if (isset($_FILES['excel_file']) && $_FILES['excel_file']['error'] === UPLOAD_ERR_OK) {
            $file = $_FILES['excel_file']['tmp_name'];
            $handle = fopen($file, 'r');
            $header = fgetcsv($handle); // Skip header row
            
            $count = 0;
            while (($row = fgetcsv($handle)) !== FALSE) {
                // Mapping: sku, eng name, arabic name, sale price, cost price
                if (count($row) < 5) continue;
                
                $sku = trim($row[0]);
                $name_en = trim($row[1]);
                $name_ar = trim($row[2]);
                $sale_price = (float)trim($row[3]);
                $purchase_price = (float)trim($row[4]);
                
                if ($name_en && $name_ar) {
                    // Check if SKU exists to update or insert
                    $existingId = null;
                    if ($sku !== "") {
                        $check = db()->prepare("SELECT id FROM stock_items WHERE sku = ?");
                        $check->execute([$sku]);
                        $existingId = $check->fetchColumn();
                    }
                    
                    if ($existingId) {
                        $stmt = db()->prepare("UPDATE stock_items SET name_en = ?, name_ar = ?, sale_price = ?, purchase_price = ? WHERE id = ?");
                        $stmt->execute([$name_en, $name_ar, $sale_price, $purchase_price, $existingId]);
                    } else {
                        $stmt = db()->prepare("INSERT INTO stock_items (sku, name_en, name_ar, sale_price, purchase_price) VALUES (?, ?, ?, ?, ?)");
                        $stmt->execute([$sku, $name_en, $name_ar, $sale_price, $purchase_price]);
                    }
                    $count++;
                }
            }
            fclose($handle);
            $message = "$count items processed successfully!";
        }
    }

    if (isset($_POST['import_customers']) || isset($_POST['import_suppliers'])) {
        $type = isset($_POST['import_customers']) ? 'customer' : 'supplier';
        if (isset($_FILES['excel_file']) && $_FILES['excel_file']['error'] === UPLOAD_ERR_OK) {
            $file = $_FILES['excel_file']['tmp_name'];
            $handle = fopen($file, 'r');
            $header = fgetcsv($handle);
            $count = 0;
            while (($row = fgetcsv($handle)) !== FALSE) {
                if (count($row) < 4) continue;
                $name = trim($row[0]);
                $email = trim($row[1]);
                $phone = trim($row[2]);
                $tax_id = isset($row[3]) ? trim($row[3]) : '';
                $balance = isset($row[4]) ? (float)trim($row[4]) : (float)trim($row[3] ?? 0);
                if ($name) {
                    $stmt = db()->prepare("INSERT INTO customers (name, email, phone, tax_id, balance, type) VALUES (?, ?, ?, ?, ?, ?)");
                    $stmt->execute([$name, $email, $phone, $tax_id, $balance, $type]);
                    $count++;
                }
            }
            fclose($handle);
            $message = "$count " . ($type === 'customer' ? 'customers' : 'suppliers') . " imported successfully!";
        }
    }

    if (isset($_POST['import_categories'])) {
        if (isset($_FILES['excel_file']) && $_FILES['excel_file']['error'] === UPLOAD_ERR_OK) {
            $file = $_FILES['excel_file']['tmp_name'];
            $handle = fopen($file, 'r');
            $header = fgetcsv($handle);
            $count = 0;
            while (($row = fgetcsv($handle)) !== FALSE) {
                if (count($row) < 2) continue;
                $name_en = trim($row[0]);
                $name_ar = trim($row[1]);
                if ($name_en && $name_ar) {
                    $stmt = db()->prepare("INSERT INTO stock_categories (name_en, name_ar) VALUES (?, ?)");
                    $stmt->execute([$name_en, $name_ar]);
                    $count++;
                }
            }
            fclose($handle);
            $message = "$count categories imported successfully!";
        }
    }

    if (isset($_POST['import_units'])) {
        if (isset($_FILES['excel_file']) && $_FILES['excel_file']['error'] === UPLOAD_ERR_OK) {
            $file = $_FILES['excel_file']['tmp_name'];
            $handle = fopen($file, 'r');
            $header = fgetcsv($handle);
            $count = 0;
            while (($row = fgetcsv($handle)) !== FALSE) {
                if (count($row) < 4) continue;
                $name_en = trim($row[0]);
                $name_ar = trim($row[1]);
                $short_en = trim($row[2]);
                $short_ar = trim($row[3]);
                if ($name_en && $name_ar) {
                    $stmt = db()->prepare("INSERT INTO stock_units (name_en, name_ar, short_name_en, short_name_ar) VALUES (?, ?, ?, ?)");
                    $stmt->execute([$name_en, $name_ar, $short_en, $short_ar]);
                    $count++;
                }
            }
            fclose($handle);
            $message = "$count units imported successfully!";
        }
    }

    if (isset($_POST['add_invoice'])) {
        $customer_id = $_POST['customer_id'] ?: null;
        $invoice_date = $_POST['invoice_date'] ?: date('Y-m-d');
        $type = $_POST['type'] ?? 'sale'; // 'sale' or 'purchase'
        $payment_type = $_POST['payment_type'] ?? 'cash';
        $status = $_POST['status'] ?? 'unpaid';
        $item_ids = $_POST['item_ids'] ?? [];
        $quantities = $_POST['quantities'] ?? [];
        $prices = $_POST['prices'] ?? [];
        
        if (!empty($item_ids)) {
            $db = db();
            $db->beginTransaction();
            try {
                $subtotal = 0;
                $total_vat = 0;
                
                $items_data = [];
                foreach ($item_ids as $index => $item_id) {
                    $qty = (float)$quantities[$index];
                    $price = (float)$prices[$index];
                    
                    // Fetch vat_rate for this item
                    $stmtVat = $db->prepare("SELECT vat_rate FROM stock_items WHERE id = ?");
                    $stmtVat->execute([$item_id]);
                    $vat_rate = (float)$stmtVat->fetchColumn();
                    
                    $line_total = $qty * $price;
                    $line_vat = $line_total * ($vat_rate / 100);
                    
                    $subtotal += $line_total;
                    $total_vat += $line_vat;
                    
                    $items_data[] = [
                        'id' => $item_id,
                        'qty' => $qty,
                        'price' => $price,
                        'total' => $line_total
                    ];
                }
                
                $total_with_vat = $subtotal + $total_vat;
                $paid_amount = ($status === 'paid') ? $total_with_vat : 0;

                $stmt = $db->prepare("INSERT INTO invoices (customer_id, invoice_date, type, payment_type, status, total_amount, vat_amount, total_with_vat, paid_amount) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)");
                $stmt->execute([$customer_id, $invoice_date, $type, $payment_type, $status, $subtotal, $total_vat, $total_with_vat, $paid_amount]);
                $invoice_id = $db->lastInsertId();

                if ($paid_amount > 0) {
                    $stmt = $db->prepare("INSERT INTO payments (invoice_id, payment_date, amount, payment_method, notes) VALUES (?, ?, ?, ?, ?)");
                    $stmt->execute([$invoice_id, $invoice_date, $paid_amount, 'Cash', 'Initial payment']);
                }

                foreach ($items_data as $item) {
                    $stmt = $db->prepare("INSERT INTO invoice_items (invoice_id, item_id, quantity, unit_price, total_price) VALUES (?, ?, ?, ?, ?)");
                    $stmt->execute([$invoice_id, $item['id'], $item['qty'], $item['price'], $item['total']]);

                    // Update stock level
                    if ($type === 'sale') {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity - ? WHERE id = ?");
                    } else {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity + ? WHERE id = ?");
                    }
                    $stmt->execute([$item['qty'], $item['id']]);
                }

                $db->commit();
                $message = "Invoice #$invoice_id created successfully!";
            } catch (Exception $e) {
                $db->rollBack();
                $message = "Error: " . $e->getMessage();
            }
        }
    }

    if (isset($_POST['delete_invoice'])) {
        $id = (int)$_POST['id'];
        if ($id) {
            $db = db();
            $db->beginTransaction();
            try {
                // Get invoice details
                $stmt = $db->prepare("SELECT type FROM invoices WHERE id = ?");
                $stmt->execute([$id]);
                $type = $stmt->fetchColumn();

                // Get items to restore stock
                $stmt = $db->prepare("SELECT item_id, quantity FROM invoice_items WHERE invoice_id = ?");
                $stmt->execute([$id]);
                $items = $stmt->fetchAll();

                foreach ($items as $item) {
                    if ($type === 'sale') {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity + ? WHERE id = ?");
                    } else {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity - ? WHERE id = ?");
                    }
                    $stmt->execute([$item['quantity'], $item['item_id']]);
                }

                $stmt = $db->prepare("DELETE FROM invoice_items WHERE invoice_id = ?");
                $stmt->execute([$id]);
                $stmt = $db->prepare("DELETE FROM invoices WHERE id = ?");
                $stmt->execute([$id]);

                $db->commit();
                $message = "Invoice deleted successfully and stock restored!";
            } catch (Exception $e) {
                $db->rollBack();
                $message = "Error: " . $e->getMessage();
            }
        }
    }

    if (isset($_POST['edit_invoice'])) {
        $invoice_id = (int)$_POST['invoice_id'];
        $customer_id = $_POST['customer_id'] ?: null;
        $invoice_date = $_POST['invoice_date'] ?: date('Y-m-d');
        $payment_type = $_POST['payment_type'] ?? 'cash';
        $status = $_POST['status'] ?? 'unpaid';
        $item_ids = $_POST['item_ids'] ?? [];
        $quantities = $_POST['quantities'] ?? [];
        $prices = $_POST['prices'] ?? [];

        if ($invoice_id && !empty($item_ids)) {
            $db = db();
            $db->beginTransaction();
            try {
                // Get old invoice type and items to revert stock
                $stmt = $db->prepare("SELECT type, paid_amount FROM invoices WHERE id = ?");
                $stmt->execute([$invoice_id]);
                $inv_info = $stmt->fetch();
                $type = $inv_info['type'];
                $old_paid_amount = (float)$inv_info['paid_amount'];

                $stmt = $db->prepare("SELECT item_id, quantity FROM invoice_items WHERE invoice_id = ?");
                $stmt->execute([$invoice_id]);
                $old_items = $stmt->fetchAll();

                foreach ($old_items as $item) {
                    if ($type === 'sale') {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity + ? WHERE id = ?");
                    } else {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity - ? WHERE id = ?");
                    }
                    $stmt->execute([$item['quantity'], $item['item_id']]);
                }

                // Delete old items
                $stmt = $db->prepare("DELETE FROM invoice_items WHERE invoice_id = ?");
                $stmt->execute([$invoice_id]);

                // Calculate new totals
                $subtotal = 0;
                $total_vat = 0;
                $items_data = [];
                foreach ($item_ids as $index => $item_id) {
                    $qty = (float)$quantities[$index];
                    $price = (float)$prices[$index];
                    
                    $stmtVat = $db->prepare("SELECT vat_rate FROM stock_items WHERE id = ?");
                    $stmtVat->execute([$item_id]);
                    $vat_rate = (float)$stmtVat->fetchColumn();
                    
                    $line_total = $qty * $price;
                    $line_vat = $line_total * ($vat_rate / 100);
                    
                    $subtotal += $line_total;
                    $total_vat += $line_vat;
                    
                    $items_data[] = [
                        'id' => $item_id,
                        'qty' => $qty,
                        'price' => $price,
                        'total' => $line_total
                    ];
                }
                
                $total_with_vat = $subtotal + $total_vat;
                $paid_amount = ($status === 'paid') ? $total_with_vat : (($status === 'unpaid') ? 0 : ($old_paid_amount > 0 ? $old_paid_amount : ($_POST['paid_amount'] ?? 0)));

                if ($paid_amount > $old_paid_amount) {
                    $diff = $paid_amount - $old_paid_amount;
                    $stmt = $db->prepare("INSERT INTO payments (invoice_id, payment_date, amount, payment_method, notes) VALUES (?, ?, ?, ?, ?)");
                    $stmt->execute([$invoice_id, $invoice_date, $diff, 'Cash', 'Payment via edit']);
                }

                // Update invoice
                $stmt = $db->prepare("UPDATE invoices SET customer_id = ?, invoice_date = ?, payment_type = ?, status = ?, total_amount = ?, vat_amount = ?, total_with_vat = ?, paid_amount = ? WHERE id = ?");
                $stmt->execute([$customer_id, $invoice_date, $payment_type, $status, $subtotal, $total_vat, $total_with_vat, $paid_amount, $invoice_id]);

                // Insert new items and update stock
                foreach ($items_data as $item) {
                    $stmt = $db->prepare("INSERT INTO invoice_items (invoice_id, item_id, quantity, unit_price, total_price) VALUES (?, ?, ?, ?, ?)");
                    $stmt->execute([$invoice_id, $item['id'], $item['qty'], $item['price'], $item['total']]);

                    if ($type === 'sale') {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity - ? WHERE id = ?");
                    } else {
                        $stmt = $db->prepare("UPDATE stock_items SET stock_quantity = stock_quantity + ? WHERE id = ?");
                    }
                    $stmt->execute([$item['qty'], $item['id']]);
                }

                $db->commit();
                $message = "Invoice #$invoice_id updated successfully!";
            } catch (Exception $e) {
                $db->rollBack();
                $message = "Error: " . $e->getMessage();
            }
        }
    }

    if (isset($_POST['add_payment_method'])) {
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        if ($name_en && $name_ar) {
            $stmt = db()->prepare("INSERT INTO payment_methods (name_en, name_ar) VALUES (?, ?)");
            $stmt->execute([$name_en, $name_ar]);
            $message = "Payment method added successfully!";
        }
    }

    if (isset($_POST['edit_payment_method'])) {
        $id = (int)$_POST['id'];
        $name_en = $_POST['name_en'] ?? '';
        $name_ar = $_POST['name_ar'] ?? '';
        if ($id && $name_en && $name_ar) {
            $stmt = db()->prepare("UPDATE payment_methods SET name_en = ?, name_ar = ? WHERE id = ?");
            $stmt->execute([$name_en, $name_ar, $id]);
            $message = "Payment method updated successfully!";
        }
    }

    if (isset($_POST['delete_payment_method'])) {
        $id = (int)$_POST['id'];
        if ($id) {
            $stmt = db()->prepare("DELETE FROM payment_methods WHERE id = ?");
            $stmt->execute([$id]);
            $message = "Payment method deleted successfully!";
        }
    }

    if (isset($_POST['update_settings'])) {
        foreach ($_POST['settings'] as $key => $value) {
            $stmt = db()->prepare("INSERT INTO settings (`key`, `value`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `value` = ?");
            $stmt->execute([$key, $value, $value]);
        }
        
        if (isset($_FILES['company_logo']) && $_FILES['company_logo']['error'] === UPLOAD_ERR_OK) {
            $ext = pathinfo($_FILES['company_logo']['name'], PATHINFO_EXTENSION);
            $filename = 'logo.' . $ext;
            $target = 'uploads/' . $filename;
            if (!is_dir('uploads')) mkdir('uploads', 0775, true);
            if (move_uploaded_file($_FILES['company_logo']['tmp_name'], $target)) {
                $stmt = db()->prepare("INSERT INTO settings (`key`, `value`) VALUES ('company_logo', ?) ON DUPLICATE KEY UPDATE `value` = ?");
                $stmt->execute([$target, $target]);
            }
        }

        if (isset($_FILES['favicon']) && $_FILES['favicon']['error'] === UPLOAD_ERR_OK) {
            $ext = pathinfo($_FILES['favicon']['name'], PATHINFO_EXTENSION);
            $filename = 'favicon.' . $ext;
            $target = 'uploads/' . $filename;
            if (!is_dir('uploads')) mkdir('uploads', 0775, true);
            if (move_uploaded_file($_FILES['favicon']['tmp_name'], $target)) {
                $stmt = db()->prepare("INSERT INTO settings (`key`, `value`) VALUES ('favicon', ?) ON DUPLICATE KEY UPDATE `value` = ?");
                $stmt->execute([$target, $target]);
            }
        }

        if (isset($_FILES['manager_signature']) && $_FILES['manager_signature']['error'] === UPLOAD_ERR_OK) {
            $ext = pathinfo($_FILES['manager_signature']['name'], PATHINFO_EXTENSION);
            $filename = 'signature.' . $ext;
            $target = 'uploads/' . $filename;
            if (!is_dir('uploads')) mkdir('uploads', 0775, true);
            if (move_uploaded_file($_FILES['manager_signature']['tmp_name'], $target)) {
                $stmt = db()->prepare("INSERT INTO settings (`key`, `value`) VALUES ('manager_signature', ?) ON DUPLICATE KEY UPDATE `value` = ?");
                $stmt->execute([$target, $target]);
            }
        }
        $message = "Settings updated successfully!";
        }
    }

    if (isset($_POST['record_payment'])) {
        $invoice_id = (int)$_POST['invoice_id'];
        $amount = (float)$_POST['amount'];
        $payment_date = $_POST['payment_date'] ?: date('Y-m-d');
        $payment_method = $_POST['payment_method'] ?: 'Cash';
        $notes = $_POST['notes'] ?? '';

        if ($invoice_id && $amount > 0) {
            $db = db();
            $db->beginTransaction();
            try {
                // Record the payment
                $stmt = $db->prepare("INSERT INTO payments (invoice_id, payment_date, amount, payment_method, notes) VALUES (?, ?, ?, ?, ?)");
                $stmt->execute([$invoice_id, $payment_date, $amount, $payment_method, $notes]);
                $payment_id = $db->lastInsertId();

                // Update invoice paid_amount and status
                $stmt = $db->prepare("SELECT total_with_vat, paid_amount FROM invoices WHERE id = ?");
                $stmt->execute([$invoice_id]);
                $inv = $stmt->fetch();

                $new_paid_amount = (float)$inv['paid_amount'] + $amount;
                $total = (float)$inv['total_with_vat'];

                $new_status = 'partially_paid';
                if ($new_paid_amount >= $total) {
                    $new_status = 'paid';
                }

                $stmt = $db->prepare("UPDATE invoices SET paid_amount = ?, status = ? WHERE id = ?");
                $stmt->execute([$new_paid_amount, $new_status, $invoice_id]);

                $db->commit();
                $message = "Payment of OMR " . number_format($amount, 3) . " recorded successfully! Receipt ID: $payment_id";
                
                // For showing receipt after redirect/refresh, we can use a session or just a message.
                // The user wants to "issue a receipt". I'll add a trigger to show the receipt modal.
                $_SESSION['show_receipt_id'] = $payment_id;
                $_SESSION['trigger_receipt_modal'] = true;
            } catch (Exception $e) {
                $db->rollBack();
                $message = "Error: " . $e->getMessage();
            }
        }
    }


// Routing & Data Fetching
$page = $_GET['page'] ?? 'dashboard';
$data = [];

if ($page === 'export') {
    $type = $_GET['type'] ?? 'sales';
    $filename = $type . "_export_" . date('Y-m-d') . ".csv";
    
    header('Content-Type: text/csv; charset=utf-8');
    header('Content-Disposition: attachment; filename=' . $filename);
    $output = fopen('php://output', 'w');
    
    // Add UTF-8 BOM for Excel
    fprintf($output, chr(0xEF).chr(0xBB).chr(0xBF));

    if ($type === 'sales' || $type === 'purchases') {
        $invType = ($type === 'sales') ? 'sale' : 'purchase';
        $where = ["v.type = ?"];
        $params = [$invType];
        if (!empty($_GET['search'])) { $where[] = "(v.id LIKE ? OR c.name LIKE ?)"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; }
        if (!empty($_GET['customer_id'])) { $where[] = "v.customer_id = ?"; $params[] = $_GET['customer_id']; }
        if (!empty($_GET['start_date'])) { $where[] = "v.invoice_date >= ?"; $params[] = $_GET['start_date']; }
        if (!empty($_GET['end_date'])) { $where[] = "v.invoice_date <= ?"; $params[] = $_GET['end_date']; }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT v.id, c.name as customer_name, v.invoice_date, v.payment_type, v.status, v.total_with_vat, v.paid_amount, (v.total_with_vat - v.paid_amount) as balance 
                               FROM invoices v LEFT JOIN customers c ON v.customer_id = c.id 
                               WHERE $whereSql ORDER BY v.id DESC");
        $stmt->execute($params);
        fputcsv($output, ['Invoice ID', 'Customer/Supplier', 'Date', 'Payment', 'Status', 'Total', 'Paid', 'Balance']);
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) fputcsv($output, $row);
    } elseif ($type === 'customers' || $type === 'suppliers') {
        $custType = ($type === 'suppliers') ? 'supplier' : 'customer';
        $where = ["type = ?"];
        $params = [$custType];
        if (!empty($_GET['search'])) { $where[] = "(name LIKE ? OR email LIKE ? OR phone LIKE ? OR tax_id LIKE ?)"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; }
        if (!empty($_GET['start_date'])) { $where[] = "DATE(created_at) >= ?"; $params[] = $_GET['start_date']; }
        if (!empty($_GET['end_date'])) { $where[] = "DATE(created_at) <= ?"; $params[] = $_GET['end_date']; }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT id, name, email, phone, tax_id, balance, created_at FROM customers WHERE $whereSql ORDER BY id DESC");
        $stmt->execute($params);
        fputcsv($output, ['ID', 'Name', 'Email', 'Phone', 'Tax ID', 'Balance', 'Created At']);
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) fputcsv($output, $row);
    } elseif ($type === 'items') {
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) { $where[] = "(i.name_en LIKE ? OR i.name_ar LIKE ? OR i.sku LIKE ?)"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; $params[] = "%{$_GET['search']}%"; }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT i.sku, i.name_en, i.name_ar, c.name_en as category, i.purchase_price, i.sale_price, i.stock_quantity, i.vat_rate 
                               FROM stock_items i LEFT JOIN stock_categories c ON i.category_id = c.id 
                               WHERE $whereSql ORDER BY i.id DESC");
        $stmt->execute($params);
        fputcsv($output, ['SKU', 'Name (EN)', 'Name (AR)', 'Category', 'Purchase Price', 'Sale Price', 'Quantity', 'VAT %']);
        while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) fputcsv($output, $row);
    }
    fclose($output);
    exit;
}

// Global data for modals
$data['categories'] = db()->query("SELECT * FROM stock_categories ORDER BY name_en ASC")->fetchAll();
$data['units'] = db()->query("SELECT * FROM stock_units ORDER BY name_en ASC")->fetchAll();
$data['suppliers'] = db()->query("SELECT * FROM customers WHERE type = 'supplier' ORDER BY name ASC")->fetchAll();

$settings_raw = db()->query("SELECT * FROM settings")->fetchAll();
$data['settings'] = [];
foreach ($settings_raw as $s) {
    $data['settings'][$s['key']] = $s['value'];
}

switch ($page) {
    case 'suppliers':
    case 'customers':
        $type = ($page === 'suppliers') ? 'supplier' : 'customer';
        $where = ["type = ?"];
        $params = [$type];
        if (!empty($_GET['search'])) {
            $where[] = "(name LIKE ? OR email LIKE ? OR phone LIKE ? OR tax_id LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        if (!empty($_GET['start_date'])) {
            $where[] = "DATE(created_at) >= ?";
            $params[] = $_GET['start_date'];
        }
        if (!empty($_GET['end_date'])) {
            $where[] = "DATE(created_at) <= ?";
            $params[] = $_GET['end_date'];
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT * FROM customers WHERE $whereSql ORDER BY id DESC");
        $stmt->execute($params);
        $data['customers'] = $stmt->fetchAll();
        break;
    case 'categories':
        // Already fetched globally
        break;
    case 'units':
        // Already fetched globally
        break;
    case 'items':
        $where = ["1=1"];
        $params = [];
        if (!empty($_GET['search'])) {
            $where[] = "(i.name_en LIKE ? OR i.name_ar LIKE ? OR i.sku LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT i.*, c.name_en as cat_en, c.name_ar as cat_ar, u.short_name_en as unit_en, u.short_name_ar as unit_ar, s.name as supplier_name 
                                      FROM stock_items i 
                                      LEFT JOIN stock_categories c ON i.category_id = c.id 
                                      LEFT JOIN stock_units u ON i.unit_id = u.id 
                                      LEFT JOIN customers s ON i.supplier_id = s.id
                                      WHERE $whereSql
                                      ORDER BY i.id DESC");
        $stmt->execute($params);
        $data['items'] = $stmt->fetchAll();
        break;
    case 'payment_methods':
        $data['payment_methods'] = db()->query("SELECT * FROM payment_methods ORDER BY id DESC")->fetchAll();
        break;
    case 'settings':
        // Already fetched globally
        break;
    case 'sales':
    case 'purchases':
        $type = ($page === 'sales') ? 'sale' : 'purchase';
        
        $where = ["v.type = ?"];
        $params = [$type];
        
        if (!empty($_GET['search'])) {
            $where[] = "(v.id LIKE ? OR c.name LIKE ?)";
            $params[] = "%{$_GET['search']}%";
            $params[] = "%{$_GET['search']}%";
        }
        
        if (!empty($_GET['customer_id'])) {
            $where[] = "v.customer_id = ?";
            $params[] = $_GET['customer_id'];
        }
        
        if (!empty($_GET['start_date'])) {
            $where[] = "v.invoice_date >= ?";
            $params[] = $_GET['start_date'];
        }
        
        if (!empty($_GET['end_date'])) {
            $where[] = "v.invoice_date <= ?";
            $params[] = $_GET['end_date'];
        }
        
        $whereSql = implode(" AND ", $where);
        $stmt = db()->prepare("SELECT v.*, c.name as customer_name, c.tax_id as customer_tax_id 
                               FROM invoices v 
                               LEFT JOIN customers c ON v.customer_id = c.id 
                               WHERE $whereSql 
                               ORDER BY v.id DESC");
        $stmt->execute($params);
        $data['invoices'] = $stmt->fetchAll();
        
        $data['items_list'] = db()->query("SELECT id, name_en, name_ar, sale_price, purchase_price, stock_quantity, vat_rate FROM stock_items ORDER BY name_en ASC")->fetchAll();
        $data['customers_list'] = db()->query("SELECT id, name FROM customers WHERE type = '" . ($type === 'sale' ? 'customer' : 'supplier') . "' ORDER BY name ASC")->fetchAll();
        break;
    default:
        $data['customers'] = db()->query("SELECT * FROM customers WHERE type = 'customer' ORDER BY id DESC LIMIT 5")->fetchAll();
        // Dashboard stats
        $data['stats'] = [
            'total_customers' => db()->query("SELECT COUNT(*) FROM customers WHERE type = 'customer'")->fetchColumn(),
            'total_items' => db()->query("SELECT COUNT(*) FROM stock_items")->fetchColumn(),
            'total_sales' => db()->query("SELECT SUM(total_with_vat) FROM invoices WHERE type = 'sale'")->fetchColumn() ?: 0,
            'total_received' => db()->query("SELECT SUM(amount) FROM payments p JOIN invoices i ON p.invoice_id = i.id WHERE i.type = 'sale'")->fetchColumn() ?: 0,
        ];
        $data['stats']['total_receivable'] = $data['stats']['total_sales'] - $data['stats']['total_received'];
        break;
}

$projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? 'Accounting System';
?>
<!doctype html>
<html lang="en" dir="ltr">
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title data-en="Accounting Admin" data-ar="لوحة التحكم المحاسبية">Accounting Admin</title>
    <meta name="description" content="<?= htmlspecialchars($projectDescription) ?>" />
    <?php if (!empty($data['settings']['favicon'])): ?>
    <link rel="icon" href="<?= htmlspecialchars($data['settings']['favicon']) ?>?v=<?= time() ?>">
    <?php endif; ?>
    
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.0/font/bootstrap-icons.css">
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap" rel="stylesheet">
    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
    <style>
        @media print {
            .sidebar, .topbar, .d-print-none, .btn, .modal-header, .modal-footer {
                display: none !important;
            }
            .main-content {
                margin-left: 0 !important;
                padding: 0 !important;
            }
            .modal {
                position: absolute;
                left: 0;
                top: 0;
                margin: 0;
                padding: 0;
                visibility: visible;
                overflow: visible !important;
                display: block !important;
            }
            .modal-dialog {
                max-width: 100% !important;
                width: 100% !important;
                margin: 0 !important;
                padding: 0 !important;
                box-shadow: none !important;
            }
            .modal-content {
                border: none !important;
                box-shadow: none !important;
            }
            body {
                background: white !important;
            }
        }
    </style>
</head>
<body>

<div class="sidebar">
    <div class="sidebar-header" data-en="Accounting" data-ar="المحاسبة">Accounting</div>
    <nav class="mt-4">
        <!-- General Section -->
        <a href="index.php?page=dashboard" class="nav-link <?= !isset($_GET['page']) || $_GET['page'] === 'dashboard' ? 'active' : '' ?>">
            <i class="bi bi-speedometer2"></i> <span data-en="Dashboard" data-ar="لوحة القيادة">Dashboard</span>
        </a>

        <!-- Operations Section -->
        <div class="nav-section-title px-4 mt-3 mb-1 text-uppercase small text-muted" data-en="Operations" data-ar="العمليات">Operations</div>
        <a href="index.php?page=sales" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'sales' ? 'active' : '' ?>">
            <i class="bi bi-cart"></i> <span data-en="Sales Tax Invoices" data-ar="فواتير المبيعات الضريبية">Sales Tax Invoices</span>
        </a>
        <a href="index.php?page=purchases" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'purchases' ? 'active' : '' ?>">
            <i class="bi bi-bag"></i> <span data-en="Purchase Tax Invoices" data-ar="فواتير المشتريات الضريبية">Purchase Tax Invoices</span>
        </a>
        <a href="#" class="nav-link">
            <i class="bi bi-wallet2"></i> <span data-en="Expenses" data-ar="المصروفات">Expenses</span>
        </a>

        <!-- Inventory Section -->
        <div class="nav-section-title px-4 mt-3 mb-1 text-uppercase small text-muted" data-en="Inventory" data-ar="المخزون">Inventory</div>
        <a href="index.php?page=items" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'items' ? 'active' : '' ?>">
            <i class="bi bi-box-seam"></i> <span data-en="Items" data-ar="الأصناف">Items</span>
        </a>
        <a href="index.php?page=categories" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'categories' ? 'active' : '' ?>">
            <i class="bi bi-tags"></i> <span data-en="Categories" data-ar="الفئات">Categories</span>
        </a>
        <a href="index.php?page=units" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'units' ? 'active' : '' ?>">
            <i class="bi bi-calculator"></i> <span data-en="Units" data-ar="الوحدات">Units</span>
        </a>

        <!-- People Section -->
        <div class="nav-section-title px-4 mt-3 mb-1 text-uppercase small text-muted" data-en="Relationships" data-ar="العلاقات">Relationships</div>
        <a href="index.php?page=customers" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'customers' ? 'active' : '' ?>">
            <i class="bi bi-people"></i> <span data-en="Customers" data-ar="العملاء">Customers</span>
        </a>
        <a href="index.php?page=suppliers" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'suppliers' ? 'active' : '' ?>">
            <i class="bi bi-truck"></i> <span data-en="Suppliers" data-ar="الموردون">Suppliers</span>
        </a>

        <!-- Configuration Section -->
        <div class="nav-section-title px-4 mt-3 mb-1 text-uppercase small text-muted" data-en="Configuration" data-ar="الإعدادات">Configuration</div>
        <a href="index.php?page=payment_methods" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'payment_methods' ? 'active' : '' ?>">
            <i class="bi bi-credit-card"></i> <span data-en="Payment Methods" data-ar="طرق الدفع">Payment Methods</span>
        </a>
        <a href="index.php?page=settings" class="nav-link <?= isset($_GET['page']) && $_GET['page'] === 'settings' ? 'active' : '' ?>">
            <i class="bi bi-building"></i> <span data-en="Company Profile" data-ar="ملف الشركة">Company Profile</span>
        </a>
        <a href="#" class="nav-link">
            <i class="bi bi-person-badge"></i> <span data-en="HR" data-ar="الموارد البشرية">HR</span>
        </a>
    </nav>
</div>

<div class="main-content">
    <header class="topbar">
        <h4 class="m-0">
            <?php 
            $titles = [
                'dashboard' => ['en' => 'Dashboard', 'ar' => 'لوحة القيادة'],
                'customers' => ['en' => 'Customers', 'ar' => 'العملاء'],
                'suppliers' => ['en' => 'Suppliers', 'ar' => 'الموردون'],
                'categories' => ['en' => 'Stock Categories', 'ar' => 'فئات المخزون'],
                'units' => ['en' => 'Stock Units', 'ar' => 'وحدات المخزون'],
                'items' => ['en' => 'Stock Items', 'ar' => 'أصناف المخزون'],
                'payment_methods' => ['en' => 'Payment Methods', 'ar' => 'طرق الدفع'],
                'sales' => ['en' => 'Sales Tax Invoices', 'ar' => 'فواتير المبيعات الضريبية'],
                'purchases' => ['en' => 'Purchase Tax Invoices', 'ar' => 'فواتير المشتريات الضريبية'],
                'settings' => ['en' => 'Company Profile', 'ar' => 'ملف الشركة'],
            ];
            $currTitle = $titles[$page] ?? $titles['dashboard'];
            ?>
            <span data-en="<?= $currTitle['en'] ?>" data-ar="<?= $currTitle['ar'] ?>"><?= $currTitle['en'] ?></span>
        </h4>
        <div class="d-flex align-items-center">
            <button id="langToggle" class="btn btn-outline-secondary btn-sm me-3">
                <i class="bi bi-translate"></i> <span data-en="العربية" data-ar="English">العربية</span>
            </button>
            <div class="dropdown">
                <button class="btn btn-link dropdown-toggle text-dark text-decoration-none" type="button" data-bs-toggle="dropdown">
                    <i class="bi bi-person-circle"></i> Admin
                </button>
                <ul class="dropdown-menu dropdown-menu-end">
                    <li><a class="dropdown-item" href="index.php?page=settings" data-en="Company Profile" data-ar="ملف الشركة">Company Profile</a></li>
                    <li><hr class="dropdown-divider"></li>
                    <li><a class="dropdown-item" href="#" data-en="Logout" data-ar="تسجيل الخروج">Logout</a></li>
                </ul>
            </div>
        </div>
    </header>

    <?php if ($message): ?>
        <div class="alert alert-success alert-dismissible fade show" role="alert">
            <?= $message ?>
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        </div>
    <?php endif; ?>

    <?php if ($page === 'dashboard'): ?>
    <div class="row g-4 mb-4">
        <div class="col">
            <div class="card p-3 border-start border-primary border-4 h-100">
                <div class="text-muted small" data-en="Total Sales" data-ar="إجمالي المبيعات">Total Sales</div>
                <div class="h4 m-0">OMR <?= number_format((float)($data['stats']['total_sales'] ?? 0), 3) ?></div>
            </div>
        </div>
        <div class="col">
            <div class="card p-3 border-start border-success border-4 h-100">
                <div class="text-muted small" data-en="Total Customers" data-ar="إجمالي العملاء">Total Customers</div>
                <div class="h4 m-0"><?= (int)($data['stats']['total_customers'] ?? 0) ?></div>
            </div>
        </div>
        <div class="col">
            <div class="card p-3 border-start border-info border-4 h-100">
                <div class="text-muted small" data-en="Total Items" data-ar="إجمالي الأصناف">Total Items</div>
                <div class="h4 m-0"><?= (int)($data['stats']['total_items'] ?? 0) ?></div>
            </div>
        </div>
        <div class="col">
            <div class="card p-3 border-start border-warning border-4 h-100">
                <div class="text-muted small" data-en="Total Received" data-ar="إجمالي المبالغ المحصلة">Total Received</div>
                <div class="h4 m-0">OMR <?= number_format((float)($data['stats']['total_received'] ?? 0), 3) ?></div>
            </div>
        </div>
        <div class="col">
            <div class="card p-3 border-start border-danger border-4 h-100">
                <div class="text-muted small" data-en="Total Balance" data-ar="إجمالي الرصيد المتبقي">Total Balance</div>
                <div class="h4 m-0">OMR <?= number_format((float)($data['stats']['total_receivable'] ?? 0), 3) ?></div>
            </div>
        </div>
    </div>

    <div class="row">
        <div class="col-md-8">
            <div class="card p-4">
                <div class="d-flex justify-content-between align-items-center mb-4">
                    <h5 class="m-0" data-en="Recent Customers" data-ar="العملاء الحاليين">Recent Customers</h5>
                    <a href="index.php?page=customers" class="btn btn-outline-primary btn-sm">
                        <span data-en="View All" data-ar="عرض الكل">View All</span>
                    </a>
                </div>
                <div class="table-responsive">
                    <table class="table table-hover align-middle">
                        <thead>
                            <tr>
                                <th data-en="Name" data-ar="الاسم">Name</th>
                                <th data-en="Phone" data-ar="الهاتف">Phone</th>
                                <th data-en="Balance" data-ar="الرصيد" class="text-end">Balance</th>
                            </tr>
                        </thead>
                        <tbody>
                            <?php foreach ($data['customers'] as $c): ?>
                            <tr>
                                <td><?= htmlspecialchars($c['name']) ?></td>
                                <td><?= htmlspecialchars($c['phone']) ?></td>
                                <td class="text-end">OMR <?= number_format((float)$c['balance'], 3) ?></td>
                            </tr>
                            <?php endforeach; ?>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
        <div class="col-md-4">
            <div class="card p-4">
                <h5 class="mb-4" data-en="Quick Links" data-ar="روابط سريعة">Quick Links</h5>
                <div class="list-group list-group-flush">
                    <button class="list-group-item list-group-item-action border-0 px-0" data-bs-toggle="modal" data-bs-target="#addCustomerModal">
                        <i class="bi bi-person-plus text-primary"></i> <span data-en="Add Customer" data-ar="إضافة عميل">Add Customer</span>
                    </button>
                    <button class="list-group-item list-group-item-action border-0 px-0" data-bs-toggle="modal" data-bs-target="#addItemModal">
                        <i class="bi bi-box-seam text-success"></i> <span data-en="Add Item" data-ar="إضافة صنف">Add Item</span>
                    </button>
                    <button class="list-group-item list-group-item-action border-0 px-0" data-bs-toggle="modal" data-bs-target="#importItemsModal">
                        <i class="bi bi-file-earmark-excel text-success"></i> <span data-en="Import Items" data-ar="استيراد أصناف">Import Items</span>
                    </button>
                    <a href="index.php?page=sales" class="list-group-item list-group-item-action border-0 px-0">
                        <i class="bi bi-cart text-primary"></i> <span data-en="Sales Tax Invoices" data-ar="فواتير المبيعات الضريبية">Sales Tax Invoices</span>
                    </a>
                    <a href="index.php?page=purchases" class="list-group-item list-group-item-action border-0 px-0">
                        <i class="bi bi-bag text-warning"></i> <span data-en="Purchase Tax Invoices" data-ar="فواتير المشتريات الضريبية">Purchase Tax Invoices</span>
                    </a>
                </div>
            </div>
        </div>
    </div>
    <?php elseif ($page === 'customers' || $page === 'suppliers'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="<?= $currTitle['en'] ?> Management" data-ar="إدارة <?= $currTitle['ar'] ?>"><?= $currTitle['en'] ?> Management</h5>
            <div>
                <button class="btn btn-outline-success me-2" data-bs-toggle="modal" data-bs-target="<?= $page === 'suppliers' ? '#importSuppliersModal' : '#importCustomersModal' ?>">
                    <i class="bi bi-file-earmark-excel"></i> <span data-en="Import Excel" data-ar="استيراد من اكسل">Import Excel</span>
                </button>
                <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addCustomerModal">
                    <i class="bi bi-plus-lg"></i> <span data-en="Add <?= $currTitle['en'] ?>" data-ar="إضافة <?= $currTitle['ar'] ?>">Add <?= $currTitle['en'] ?></span>
                </button>
            </div>
        </div>

        <!-- Search & Filter Bar -->
        <div class="bg-light p-3 rounded mb-4">
            <form method="GET" class="row g-2 align-items-end">
                <input type="hidden" name="page" value="<?= $page ?>">
                <div class="col-md-4">
                    <label class="form-label small" data-en="Search" data-ar="بحث">Search</label>
                    <input type="text" name="search" class="form-control" value="<?= htmlspecialchars($_GET['search'] ?? '') ?>" placeholder="Name, email, or phone..." data-en="Name, email, or phone..." data-ar="الاسم، البريد، أو الهاتف...">
                </div>
                <div class="col-md-2">
                    <label class="form-label small" data-en="From Date" data-ar="من تاريخ">From Date</label>
                    <input type="date" name="start_date" class="form-control" value="<?= htmlspecialchars($_GET['start_date'] ?? '') ?>">
                </div>
                <div class="col-md-2">
                    <label class="form-label small" data-en="To Date" data-ar="إلى تاريخ">To Date</label>
                    <input type="date" name="end_date" class="form-control" value="<?= htmlspecialchars($_GET['end_date'] ?? '') ?>">
                </div>
                <div class="col-md-4 d-flex gap-1">
                    <button type="submit" class="btn btn-primary flex-grow-1">
                        <i class="bi bi-filter"></i> <span data-en="Filter" data-ar="تصفية">Filter</span>
                    </button>
                    <a href="index.php?page=export&type=<?= $page ?>&<?= http_build_query($_GET) ?>" class="btn btn-outline-success">
                        <i class="bi bi-download"></i> <span data-en="Export" data-ar="تصدير">Export</span>
                    </a>
                    <?php if (!empty($_GET['search']) || !empty($_GET['start_date']) || !empty($_GET['end_date'])): ?>
                    <a href="index.php?page=<?= $page ?>" class="btn btn-outline-secondary">
                        <i class="bi bi-x-lg"></i>
                    </a>
                    <?php endif; ?>
                </div>
            </form>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="Name" data-ar="الاسم">Name</th>
                        <th data-en="Tax ID" data-ar="الرقم الضريبي">Tax ID</th>
                        <th data-en="Email" data-ar="البريد">Email</th>
                        <th data-en="Phone" data-ar="الهاتف">Phone</th>
                        <th data-en="Balance" data-ar="الرصيد" class="text-end">Balance</th>
                        <th data-en="Actions" data-ar="الإجراءات" class="text-end">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($data['customers'] as $c): ?>
                    <tr>
                        <td><?= htmlspecialchars($c['name']) ?></td>
                        <td><?= htmlspecialchars($c['tax_id'] ?? '---') ?></td>
                        <td><?= htmlspecialchars($c['email']) ?></td>
                        <td><?= htmlspecialchars($c['phone']) ?></td>
                        <td class="text-end">OMR <?= number_format((float)$c['balance'], 3) ?></td>
                        <td class="text-end">
                            <div class="btn-group btn-group-sm">
                                <button class="btn btn-outline-primary" title="Edit" data-bs-toggle="modal" data-bs-target="#editCustomerModal<?= $c['id'] ?>"><i class="bi bi-pencil"></i></button>
                                <form method="POST" class="d-inline" onsubmit="return confirm('Are you sure?')">
                                    <input type="hidden" name="id" value="<?= $c['id'] ?>">
                                    <button type="submit" name="delete_customer" class="btn btn-outline-danger" title="Delete"><i class="bi bi-trash"></i></button>
                                </form>
                            </div>

                            <!-- Edit Customer Modal -->
                            <div class="modal fade" id="editCustomerModal<?= $c['id'] ?>" tabindex="-1">
                                <div class="modal-dialog">
                                    <div class="modal-content border-0 shadow text-start">
                                        <div class="modal-header">
                                            <h5 class="modal-title">
                                                <span data-en="Edit <?= $currTitle['en'] ?>" data-ar="تعديل <?= $currTitle['ar'] ?>">Edit <?= $currTitle['en'] ?></span>
                                            </h5>
                                            <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                                        </div>
                                        <form method="POST">
                                            <input type="hidden" name="id" value="<?= $c['id'] ?>">
                                            <div class="modal-body">
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Name" data-ar="الاسم">Name</label>
                                                    <input type="text" name="name" class="form-control" value="<?= htmlspecialchars($c['name']) ?>" required>
                                                </div>
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Email" data-ar="البريد الإلكتروني">Email</label>
                                                    <input type="email" name="email" class="form-control" value="<?= htmlspecialchars($c['email'] ?? '') ?>">
                                                </div>
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Phone" data-ar="الهاتف">Phone</label>
                                                    <input type="text" name="phone" class="form-control" value="<?= htmlspecialchars($c['phone'] ?? '') ?>">
                                                </div>
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Tax ID / VAT No" data-ar="الرقم الضريبي">Tax ID / VAT No</label>
                                                    <input type="text" name="tax_id" class="form-control" value="<?= htmlspecialchars($c['tax_id'] ?? '') ?>">
                                                </div>
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Balance" data-ar="الرصيد">Balance</label>
                                                    <input type="number" step="0.001" name="balance" class="form-control" value="<?= (float)$c['balance'] ?>">
                                                </div>
                                            </div>
                                            <div class="modal-footer">
                                                <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                                                <button type="submit" name="edit_customer" class="btn btn-primary" data-en="Update" data-ar="تحديث">Update</button>
                                            </div>
                                        </form>
                                    </div>
                                </div>
                            </div>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>

    <?php elseif ($page === 'categories'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="Stock Categories" data-ar="فئات المخزون">Stock Categories</h5>
            <div>
                <button class="btn btn-outline-success me-2" data-bs-toggle="modal" data-bs-target="#importCategoriesModal">
                    <i class="bi bi-file-earmark-excel"></i> <span data-en="Import Excel" data-ar="استيراد من اكسل">Import Excel</span>
                </button>
                <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addCategoryModal">
                    <i class="bi bi-plus-lg"></i> <span data-en="Add Category" data-ar="إضافة فئة">Add Category</span>
                </button>
            </div>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="ID" data-ar="المعرف">ID</th>
                        <th data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</th>
                        <th data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($data['categories'] as $cat): ?>
                    <tr>
                        <td><?= $cat['id'] ?></td>
                        <td><?= htmlspecialchars($cat['name_en']) ?></td>
                        <td><?= htmlspecialchars($cat['name_ar']) ?></td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>

    <?php elseif ($page === 'units'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="Stock Units" data-ar="وحدات المخزون">Stock Units</h5>
            <div>
                <button class="btn btn-outline-success me-2" data-bs-toggle="modal" data-bs-target="#importUnitsModal">
                    <i class="bi bi-file-earmark-excel"></i> <span data-en="Import Excel" data-ar="استيراد من اكسل">Import Excel</span>
                </button>
                <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addUnitModal">
                    <i class="bi bi-plus-lg"></i> <span data-en="Add Unit" data-ar="إضافة وحدة">Add Unit</span>
                </button>
            </div>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</th>
                        <th data-en="Short (EN)" data-ar="الاختصار (إنجليزي)">Short (EN)</th>
                        <th data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</th>
                        <th data-en="Short (AR)" data-ar="الاختصار (عربي)">Short (AR)</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($data['units'] as $u): ?>
                    <tr>
                        <td><?= htmlspecialchars($u['name_en']) ?></td>
                        <td><?= htmlspecialchars($u['short_name_en']) ?></td>
                        <td><?= htmlspecialchars($u['name_ar']) ?></td>
                        <td><?= htmlspecialchars($u['short_name_ar']) ?></td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>

    <?php elseif ($page === 'items'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="Stock Items" data-ar="أصناف المخزون">Stock Items</h5>
            <div>
                <button class="btn btn-outline-success me-2" data-bs-toggle="modal" data-bs-target="#importItemsModal">
                    <i class="bi bi-file-earmark-excel"></i> <span data-en="Import Excel" data-ar="استيراد من اكسل">Import Excel</span>
                </button>
                <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addItemModal">
                    <i class="bi bi-plus-lg"></i> <span data-en="Add Item" data-ar="إضافة صنف">Add Item</span>
                </button>
            </div>
        </div>

        <!-- Search Bar -->
        <div class="bg-light p-3 rounded mb-4">
            <form method="GET" class="row g-2 align-items-end">
                <input type="hidden" name="page" value="items">
                <div class="col-md-7">
                    <label class="form-label small" data-en="Search" data-ar="بحث">Search</label>
                    <input type="text" name="search" class="form-control" value="<?= htmlspecialchars($_GET['search'] ?? '') ?>" placeholder="Name or SKU..." data-en="Name or SKU..." data-ar="الاسم أو الباركود...">
                </div>
                <div class="col-md-5 d-flex gap-1">
                    <button type="submit" class="btn btn-primary flex-grow-1">
                        <i class="bi bi-search"></i> <span data-en="Search" data-ar="بحث">Search</span>
                    </button>
                    <a href="index.php?page=export&type=items&<?= http_build_query($_GET) ?>" class="btn btn-outline-success">
                        <i class="bi bi-download"></i> <span data-en="Export" data-ar="تصدير">Export</span>
                    </a>
                    <?php if (!empty($_GET['search'])): ?>
                    <a href="index.php?page=items" class="btn btn-outline-secondary">
                        <i class="bi bi-x-lg"></i>
                    </a>
                    <?php endif; ?>
                </div>
            </form>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="Image" data-ar="الصورة">Image</th>
                        <th data-en="SKU" data-ar="الباركود">SKU</th>
                        <th data-en="Name" data-ar="الاسم">Name</th>
                        <th data-en="Category" data-ar="الفئة">Category</th>
                        <th data-en="Supplier" data-ar="المورد">Supplier</th>
                        <th data-en="Stock Level" data-ar="المخزون">Stock Level</th>
                        <th data-en="Expiry" data-ar="تاريخ الانتهاء">Expiry</th>
                        <th data-en="VAT" data-ar="الضريبة">VAT</th>
                        <th data-en="Actions" data-ar="الإجراءات">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($data['items'] as $item): ?>
                    <tr>
                        <td>
                            <?php if ($item['image_path']): ?>
                                <img src="<?= htmlspecialchars($item['image_path']) ?>" alt="item" style="width: 40px; height: 40px; object-fit: cover;" class="rounded">
                            <?php else: ?>
                                <div class="bg-light rounded d-flex align-items-center justify-content-center" style="width: 40px; height: 40px;">
                                    <i class="bi bi-image text-muted"></i>
                                </div>
                            <?php endif; ?>
                        </td>
                        <td><?= htmlspecialchars($item['sku']) ?></td>
                        <td>
                            <div class="fw-bold"><?= htmlspecialchars($item['name_en']) ?></div>
                            <div class="small text-muted"><?= htmlspecialchars($item['name_ar']) ?></div>
                        </td>
                        <td><span data-en="<?= htmlspecialchars($item['cat_en']) ?>" data-ar="<?= htmlspecialchars($item['cat_ar']) ?>"><?= htmlspecialchars($item['cat_en']) ?></span></td>
                        <td><?= htmlspecialchars($item['supplier_name'] ?? '---') ?></td>
                        <td>
                            <div class="text-end">
                                <strong><?= number_format((float)$item['stock_quantity'], 3) ?></strong>
                                <div class="small text-muted">Min: <?= number_format((float)$item['min_stock_level'], 3) ?></div>
                                <?php if ($item['stock_quantity'] <= $item['min_stock_level']): ?>
                                    <span class="badge bg-danger" data-en="Low Stock" data-ar="مخزون منخفض">Low Stock</span>
                                <?php endif; ?>
                            </div>
                        </td>
                        <td><?= $item['expiry_date'] ?: '---' ?></td>
                        <td><?= number_format((float)$item['vat_rate'], 3) ?>%</td>
                        <td>
                            <div class="btn-group btn-group-sm">
                                <button class="btn btn-outline-info" title="View" data-bs-toggle="modal" data-bs-target="#viewItemModal<?= $item['id'] ?>"><i class="bi bi-eye"></i></button>
                                <button class="btn btn-outline-primary" title="Edit" data-bs-toggle="modal" data-bs-target="#editItemModal<?= $item['id'] ?>"><i class="bi bi-pencil"></i></button>
                                <form method="POST" class="d-inline" onsubmit="return confirm('Are you sure?')">
                                    <input type="hidden" name="id" value="<?= $item['id'] ?>">
                                    <button type="submit" name="delete_item" class="btn btn-outline-danger" title="Delete"><i class="bi bi-trash"></i></button>
                                </form>
                            </div>

                            <!-- Edit Item Modal -->
                            <div class="modal fade" id="editItemModal<?= $item['id'] ?>" tabindex="-1">
                                <div class="modal-dialog modal-lg">
                                    <div class="modal-content border-0 shadow">
                                        <div class="modal-header">
                                            <h5 class="modal-title" data-en="Edit Item" data-ar="تعديل الصنف">Edit Item</h5>
                                            <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                                        </div>
                                        <form method="POST" enctype="multipart/form-data">
                                            <input type="hidden" name="id" value="<?= $item['id'] ?>">
                                            <div class="modal-body">
                                                <div class="row g-3">
                                                    <div class="col-md-6">
                                                        <label class="form-label" data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</label>
                                                        <input type="text" name="name_en" class="form-control" value="<?= htmlspecialchars($item['name_en']) ?>" required>
                                                    </div>
                                                    <div class="col-md-6">
                                                        <label class="form-label" data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</label>
                                                        <input type="text" name="name_ar" class="form-control" value="<?= htmlspecialchars($item['name_ar']) ?>" required>
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Category" data-ar="الفئة">Category</label>
                                                        <select name="category_id" class="form-select">
                                                            <option value="">---</option>
                                                            <?php foreach ($data['categories'] ?? [] as $c): ?>
                                                            <option value="<?= $c['id'] ?>" <?= $item['category_id'] == $c['id'] ? 'selected' : '' ?>><?= htmlspecialchars($c['name_en']) ?> / <?= htmlspecialchars($c['name_ar']) ?></option>
                                                            <?php endforeach; ?>
                                                        </select>
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Unit" data-ar="الوحدة">Unit</label>
                                                        <select name="unit_id" class="form-select">
                                                            <option value="">---</option>
                                                            <?php foreach ($data['units'] ?? [] as $u): ?>
                                                            <option value="<?= $u['id'] ?>" <?= $item['unit_id'] == $u['id'] ? 'selected' : '' ?>><?= htmlspecialchars($u['short_name_en']) ?> / <?= htmlspecialchars($u['short_name_ar']) ?></option>
                                                            <?php endforeach; ?>
                                                        </select>
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Supplier" data-ar="المورد">Supplier</label>
                                                        <select name="supplier_id" class="form-select">
                                                            <option value="">---</option>
                                                            <?php foreach ($data['suppliers'] ?? [] as $s): ?>
                                                            <option value="<?= $s['id'] ?>" <?= $item['supplier_id'] == $s['id'] ? 'selected' : '' ?>><?= htmlspecialchars($s['name']) ?></option>
                                                            <?php endforeach; ?>
                                                        </select>
                                                    </div>
                                                    <div class="col-md-6">
                                                        <label class="form-label" data-en="SKU / Barcode" data-ar="الباركود">SKU / Barcode</label>
                                                        <div class="input-group">
                                                            <input type="text" name="sku" class="form-control" value="<?= htmlspecialchars($item['sku']) ?>">
                                                        </div>
                                                    </div>
                                                    <div class="col-md-3">
                                                        <label class="form-label" data-en="Sale Price" data-ar="سعر البيع">Sale Price</label>
                                                        <input type="number" step="0.001" name="sale_price" class="form-control" value="<?= (float)$item['sale_price'] ?>">
                                                    </div>
                                                    <div class="col-md-3">
                                                        <label class="form-label" data-en="Purchase Price" data-ar="سعر الشراء">Purchase Price</label>
                                                        <input type="number" step="0.001" name="purchase_price" class="form-control" value="<?= (float)$item['purchase_price'] ?>">
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Stock Quantity" data-ar="الكمية">Stock Quantity</label>
                                                        <input type="number" step="0.001" name="stock_quantity" class="form-control" value="<?= (float)$item['stock_quantity'] ?>">
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Min Stock Level" data-ar="الحد الأدنى للمخزون">Min Stock Level</label>
                                                        <input type="number" step="0.001" name="min_stock_level" class="form-control" value="<?= (float)$item['min_stock_level'] ?>">
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="Change Picture" data-ar="تغيير الصورة">Change Picture</label>
                                                        <input type="file" name="image" class="form-control" accept="image/*">
                                                    </div>
                                                    <div class="col-md-4">
                                                        <label class="form-label" data-en="VAT Rate (%)" data-ar="ضريبة القيمة المضافة (%)">VAT Rate (%)</label>
                                                        <input type="number" step="0.001" name="vat_rate" class="form-control" value="<?= (float)$item['vat_rate'] ?>">
                                                    </div>
                                                    <div class="col-md-8">
                                                        <div class="form-check form-switch mt-4">
                                                            <input class="form-check-input hasExpiryToggleEdit" type="checkbox" id="hasExpiryToggle<?= $item['id'] ?>" <?= $item['expiry_date'] ? 'checked' : '' ?>>
                                                            <label class="form-check-label" for="hasExpiryToggle<?= $item['id'] ?>" data-en="Has Expiry Date?" data-ar="هل له تاريخ انتهاء؟">Has Expiry Date?</label>
                                                        </div>
                                                    </div>
                                                    <div class="col-md-6 expiryDateContainerEdit" style="<?= $item['expiry_date'] ? 'display: block;' : 'display: none;' ?>">
                                                        <label class="form-label" data-en="Expiry Date" data-ar="تاريخ الانتهاء">Expiry Date</label>
                                                        <input type="date" name="expiry_date" class="form-control" value="<?= $item['expiry_date'] ?>">
                                                    </div>
                                                </div>
                                            </div>
                                            <div class="modal-footer">
                                                <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                                                <button type="submit" name="edit_item" class="btn btn-primary" data-en="Update Item" data-ar="تحديث الصنف">Update Item</button>
                                            </div>
                                        </form>
                                    </div>
                                </div>
                            </div>

                            <!-- View Item Modal -->
                            <div class="modal fade" id="viewItemModal<?= $item['id'] ?>" tabindex="-1">
                                <div class="modal-dialog">
                                    <div class="modal-content border-0 shadow">
                                        <div class="modal-header">
                                            <h5 class="modal-title"><?= htmlspecialchars($item['name_en'] ) ?> / <?= htmlspecialchars($item['name_ar']) ?></h5>
                                            <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                                        </div>
                                        <div class="modal-body text-start">
                                            <div class="text-center mb-4">
                                                <?php if ($item['image_path']): ?>
                                                    <img src="<?= htmlspecialchars($item['image_path']) ?>" class="img-fluid rounded shadow-sm" style="max-height: 200px;">
                                                <?php else: ?>
                                                    <div class="bg-light py-5 rounded"><i class="bi bi-image h1 text-muted"></i></div>
                                                <?php endif; ?>
                                            </div>
                                            <div class="row g-3">
                                                <div class="col-6"><small class="text-muted d-block">SKU</small> <?= htmlspecialchars($item['sku'] ?: '---') ?></div>
                                                <div class="col-6"><small class="text-muted d-block">Category</small> <?= htmlspecialchars($item['cat_en'] ?: '---') ?></div>
                                                <div class="col-6"><small class="text-muted d-block">Supplier</small> <?= htmlspecialchars($item['supplier_name'] ?? '---') ?></div>
                                                <div class="col-6"><small class="text-muted d-block">Unit</small> <?= htmlspecialchars($item['unit_en'] ?: '---') ?></div>
                                                <div class="col-4"><small class="text-muted d-block">Purchase Price</small> OMR <?= number_format((float)$item['purchase_price'], 3) ?></div>
                                                <div class="col-4"><small class="text-muted d-block">Sale Price</small> OMR <?= number_format((float)$item['sale_price'], 3) ?></div>
                                                <div class="col-4"><small class="text-muted d-block">Stock</small> <?= number_format((float)$item['stock_quantity'], 3) ?></div>
                                                <div class="col-4"><small class="text-muted d-block">VAT Rate</small> <?= number_format((float)$item['vat_rate'], 3) ?>%</div>
                                                <div class="col-6"><small class="text-muted d-block">Min Stock</small> <?= number_format((float)$item['min_stock_level'], 3) ?></div>
                                                <div class="col-6"><small class="text-muted d-block">Expiry Date</small> <?= $item['expiry_date'] ?: '---' ?></div>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>
    <?php elseif ($page === 'sales' || $page === 'purchases'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="<?= $currTitle['en'] ?>" data-ar="<?= $currTitle['ar'] ?>"><?= $currTitle['en'] ?></h5>
            <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addInvoiceModal">
                <i class="bi bi-plus-lg"></i> <span data-en="Create New Tax Invoice" data-ar="إنشاء فاتورة ضريبية جديدة">Create New Tax Invoice</span>
            </button>
        </div>

        <!-- Filters Section -->
        <div class="bg-light p-3 rounded mb-4">
            <form method="GET" class="row g-3">
                <input type="hidden" name="page" value="<?= $page ?>">
                <div class="col-md-3">
                    <label class="form-label small fw-bold" data-en="Search" data-ar="بحث">Search</label>
                    <input type="text" name="search" class="form-control form-control-sm" value="<?= htmlspecialchars($_GET['search'] ?? '') ?>" placeholder="Inv # or Name...">
                </div>
                <div class="col-md-3">
                    <label class="form-label small fw-bold" data-en="<?= $page === 'sales' ? 'Customer' : 'Supplier' ?>" data-ar="<?= $page === 'sales' ? 'العميل' : 'المورد' ?>"><?= $page === 'sales' ? 'Customer' : 'Supplier' ?></label>
                    <select name="customer_id" class="form-select form-select-sm">
                        <option value="" data-en="All" data-ar="الكل">All</option>
                        <?php foreach ($data['customers_list'] as $c): ?>
                        <option value="<?= $c['id'] ?>" <?= (($_GET['customer_id'] ?? '') == $c['id']) ? 'selected' : '' ?>><?= htmlspecialchars($c['name']) ?></option>
                        <?php endforeach; ?>
                    </select>
                </div>
                <div class="col-md-2">
                    <label class="form-label small fw-bold" data-en="Start Date" data-ar="من تاريخ">Start Date</label>
                    <input type="date" name="start_date" class="form-control form-control-sm" value="<?= htmlspecialchars($_GET['start_date'] ?? '') ?>">
                </div>
                <div class="col-md-2">
                    <label class="form-label small fw-bold" data-en="End Date" data-ar="إلى تاريخ">End Date</label>
                    <input type="date" name="end_date" class="form-control form-control-sm" value="<?= htmlspecialchars($_GET['end_date'] ?? '') ?>">
                </div>
                <div class="col-md-2 d-flex align-items-end gap-1">
                    <button type="submit" class="btn btn-primary btn-sm flex-grow-1">
                        <i class="bi bi-filter"></i> <span data-en="Filter" data-ar="تصفية">Filter</span>
                    </button>
                    <a href="index.php?page=export&type=<?= $page ?>&<?= http_build_query($_GET) ?>" class="btn btn-success btn-sm">
                        <i class="bi bi-download"></i> <span data-en="Export" data-ar="تصدير">Export</span>
                    </a>
                    <a href="index.php?page=<?= $page ?>" class="btn btn-outline-secondary btn-sm flex-grow-1">
                        <i class="bi bi-x-circle"></i> <span data-en="Clear" data-ar="مسح">Clear</span>
                    </a>
                </div>
            </form>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="Invoice #" data-ar="رقم الفاتورة">Invoice #</th>
                        <th data-en="Date" data-ar="التاريخ">Date</th>
                        <th data-en="<?= $page === 'sales' ? 'Customer' : 'Supplier' ?>" data-ar="<?= $page === 'sales' ? 'العميل' : 'المورد' ?>"><?= $page === 'sales' ? 'Customer' : 'Supplier' ?></th>
                        <th data-en="Status" data-ar="الحالة">Status</th>
                        <th data-en="Total" data-ar="الإجمالي" class="text-end">Total</th>
                        <th data-en="Paid" data-ar="المدفوع" class="text-end">Paid</th>
                        <th data-en="Balance" data-ar="المتبقي" class="text-end">Balance</th>
                        <th data-en="Actions" data-ar="الإجراءات" class="text-end">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    <?php 
                    foreach ($data['invoices'] as $inv): 
                        // Fetch items for this invoice
                        $items = db()->prepare("SELECT ii.*, i.name_en, i.name_ar, i.vat_rate 
                                                FROM invoice_items ii 
                                                JOIN stock_items i ON ii.item_id = i.id 
                                                WHERE ii.invoice_id = ?");
                        $items->execute([$inv['id']]);
                        $inv['items'] = $items->fetchAll(PDO::FETCH_ASSOC);
                    ?>
                    <tr>
                        <td>INV-<?= str_pad((string)$inv['id'], 5, '0', STR_PAD_LEFT) ?></td>
                        <td><?= $inv['invoice_date'] ?></td>
                        <td><?= htmlspecialchars($inv['customer_name'] ?? '---') ?></td>
                        <td>
                            <?php 
                                $statusClass = 'bg-secondary';
                                $statusLabelEn = ucfirst($inv['status']);
                                $statusLabelAr = $inv['status'];
                                
                                if ($inv['status'] === 'paid') {
                                    $statusClass = 'bg-success';
                                    $statusLabelAr = 'مدفوع';
                                } elseif ($inv['status'] === 'unpaid') {
                                    $statusClass = 'bg-danger';
                                    $statusLabelAr = 'غير مدفوع';
                                } elseif ($inv['status'] === 'partially_paid') {
                                    $statusClass = 'bg-warning text-dark';
                                    $statusLabelAr = 'مدفوع جزئياً';
                                    $statusLabelEn = 'Partially Paid';
                                }
                            ?>
                            <span class="badge <?= $statusClass ?>">
                                <span data-en="<?= $statusLabelEn ?>" data-ar="<?= $statusLabelAr ?>"><?= $statusLabelEn ?></span>
                            </span>
                        </td>
                        <td class="text-end fw-bold">OMR <?= number_format((float)$inv['total_with_vat'], 3) ?></td>
                        <td class="text-end text-success">OMR <?= number_format((float)$inv['paid_amount'], 3) ?></td>
                        <td class="text-end text-danger fw-bold">OMR <?= number_format((float)($inv['total_with_vat'] - $inv['paid_amount']), 3) ?></td>
                        <td class="text-end">
                            <div class="btn-group btn-group-sm">
                                <?php if ($inv['status'] !== 'paid'): ?>
                                <button class="btn btn-outline-success pay-invoice-btn" 
                                        data-id="<?= $inv['id'] ?>" 
                                        data-total="<?= $inv['total_with_vat'] ?>" 
                                        data-paid="<?= $inv['paid_amount'] ?>" 
                                        data-bs-toggle="modal" data-bs-target="#payInvoiceModal"
                                        title="Pay">
                                    <i class="bi bi-credit-card"></i>
                                </button>
                                <?php endif; ?>
                                <button class="btn btn-outline-info view-invoice-btn" 
                                        data-json='<?= json_encode($inv, JSON_HEX_APOS | JSON_HEX_QUOT) ?>' 
                                        data-bs-toggle="modal" data-bs-target="#viewInvoiceModal"
                                        title="Print Invoice">
                                    <i class="bi bi-printer"></i>
                                </button>
                                <button class="btn btn-outline-warning view-payments-btn" 
                                        data-id="<?= $inv['id'] ?>"
                                        data-bs-toggle="modal" data-bs-target="#viewPaymentsModal"
                                        title="View Receipts">
                                    <i class="bi bi-receipt"></i>
                                </button>
                                <button class="btn btn-outline-primary edit-invoice-btn" 
                                        data-json='<?= json_encode($inv, JSON_HEX_APOS | JSON_HEX_QUOT) ?>' 
                                        data-bs-toggle="modal" data-bs-target="#editInvoiceModal">
                                    <i class="bi bi-pencil"></i>
                                </button>
                                <form method="POST" class="d-inline" onsubmit="return confirm('Are you sure? This will restore stock levels.')">
                                    <input type="hidden" name="id" value="<?= $inv['id'] ?>">
                                    <button type="submit" name="delete_invoice" class="btn btn-outline-danger"><i class="bi bi-trash"></i></button>
                                </form>
                            </div>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>

    <!-- Add Invoice Modal -->
    <div class="modal fade" id="addInvoiceModal" tabindex="-1">
        <div class="modal-dialog modal-xl">
            <div class="modal-content border-0 shadow">
                <div class="modal-header">
                    <h5 class="modal-title" data-en="Create <?= $page === 'sales' ? 'Sales' : 'Purchase' ?> Tax Invoice" data-ar="إنشاء فاتورة <?= $page === 'sales' ? 'مبيعات' : 'مشتريات' ?> ضريبية">Create <?= $page === 'sales' ? 'Sales' : 'Purchase' ?> Tax Invoice</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <form method="POST">
                    <input type="hidden" name="type" value="<?= $page === 'sales' ? 'sale' : 'purchase' ?>">
                    <div class="modal-body">
                        <div class="row mb-4">
                            <div class="col-md-4">
                                <label class="form-label" data-en="<?= $page === 'sales' ? 'Customer' : 'Supplier' ?>" data-ar="<?= $page === 'sales' ? 'العميل' : 'المورد' ?>"><?= $page === 'sales' ? 'Customer' : 'Supplier' ?></label>
                                <select name="customer_id" class="form-select" required>
                                    <option value="">--- Select ---</option>
                                    <?php foreach ($data['customers_list'] as $c): ?>
                                    <option value="<?= $c['id'] ?>"><?= htmlspecialchars($c['name']) ?></option>
                                    <?php endforeach; ?>
                                </select>
                            </div>
                            <div class="col-md-4">
                                <label class="form-label" data-en="Invoice Date" data-ar="تاريخ الفاتورة">Invoice Date</label>
                                <input type="date" name="invoice_date" class="form-control" value="<?= date('Y-m-d') ?>" required>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label" data-en="Payment Type" data-ar="نوع الدفع">Payment Type</label>
                                <select name="payment_type" class="form-select" required>
                                    <option value="cash" data-en="Cash" data-ar="نقداً">Cash</option>
                                    <option value="credit" data-en="Credit" data-ar="آجل">Credit</option>
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label" data-en="Status" data-ar="الحالة">Status</label>
                                <select name="status" class="form-select" required>
                                    <option value="unpaid" data-en="Unpaid" data-ar="غير مدفوع">Unpaid</option>
                                    <option value="paid" data-en="Paid" data-ar="مدفوع">Paid</option>
                                    <option value="partially_paid" data-en="Partially Paid" data-ar="مدفوع جزئياً">Partially Paid</option>
                                </select>
                            </div>
                        </div>

                        <div class="mb-4 position-relative">
                            <label class="form-label fw-bold" data-en="Search Product (SKU / Name)" data-ar="بحث عن صنف (باركود / اسم)">Search Product (SKU / Name)</label>
                            <div class="input-group">
                                <span class="input-group-text"><i class="bi bi-search"></i></span>
                                <input type="text" id="productSearchInput" class="form-control" placeholder="Search by SKU, Name EN or AR..." data-en="Search by SKU, Name EN or AR..." data-ar="ابحث بالباركود، الاسم الإنجليزي أو العربي...">
                            </div>
                            <div id="searchSuggestions" class="list-group position-absolute w-100 shadow-lg" style="z-index: 1050; display: none;"></div>
                        </div>

                        <div class="table-responsive">
                            <table class="table table-bordered" id="invoiceItemsTable">
                                <thead class="bg-light">
                                    <tr>
                                        <th style="width: 40%;" data-en="Item" data-ar="الصنف">Item</th>
                                        <th data-en="Quantity" data-ar="الكمية">Quantity</th>
                                        <th data-en="Unit Price" data-ar="سعر الوحدة">Unit Price</th>
                                        <th data-en="VAT %" data-ar="الضريبة %">VAT %</th>
                                        <th data-en="Total" data-ar="الإجمالي">Total</th>
                                        <th style="width: 50px;"></th>
                                    </tr>
                                </thead>
                                <tbody id="invoiceItemsTableBody">
                                    <!-- Rows added dynamically via search -->
                                </tbody>
                                <tfoot>
                                    <tr>
                                        <td colspan="4" class="text-end fw-bold" data-en="Subtotal" data-ar="الإجمالي">Subtotal</td>
                                        <td class="fw-bold" id="subtotal">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                    <tr>
                                        <td colspan="4" class="text-end fw-bold text-primary" data-en="VAT Amount" data-ar="مبلغ الضريبة">VAT Amount</td>
                                        <td class="fw-bold text-primary" id="totalVat">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                    <tr class="table-dark">
                                        <td colspan="4" class="text-end fw-bold" data-en="Grand Total (Inc. VAT)" data-ar="الإجمالي الكلي (شامل الضريبة)">Grand Total (Inc. VAT)</td>
                                        <td class="fw-bold" id="grandTotal">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                </tfoot>
                            </table>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                        <button type="submit" name="add_invoice" class="btn btn-success" data-en="Save Invoice" data-ar="حفظ الفاتورة">Save Invoice</button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- Edit Invoice Modal -->
    <div class="modal fade" id="editInvoiceModal" tabindex="-1">
        <div class="modal-dialog modal-xl">
            <div class="modal-content border-0 shadow">
                <div class="modal-header">
                    <h5 class="modal-title" data-en="Edit Tax Invoice" data-ar="تعديل الفاتورة الضريبية">Edit Tax Invoice</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <form method="POST">
                    <input type="hidden" name="invoice_id" id="edit_invoice_id">
                    <div class="modal-body">
                        <div class="row mb-4">
                            <div class="col-md-4">
                                <label class="form-label" data-en="<?= $page === 'sales' ? 'Customer' : 'Supplier' ?>" data-ar="<?= $page === 'sales' ? 'العميل' : 'المورد' ?>"><?= $page === 'sales' ? 'Customer' : 'Supplier' ?></label>
                                <select name="customer_id" id="edit_customer_id" class="form-select" required>
                                    <option value="">--- Select ---</option>
                                    <?php foreach ($data['customers_list'] as $c): ?>
                                    <option value="<?= $c['id'] ?>"><?= htmlspecialchars($c['name']) ?></option>
                                    <?php endforeach; ?>
                                </select>
                            </div>
                            <div class="col-md-4">
                                <label class="form-label" data-en="Invoice Date" data-ar="تاريخ الفاتورة">Invoice Date</label>
                                <input type="date" name="invoice_date" id="edit_invoice_date" class="form-control" required>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label" data-en="Payment Type" data-ar="نوع الدفع">Payment Type</label>
                                <select name="payment_type" id="edit_payment_type" class="form-select" required>
                                    <option value="cash" data-en="Cash" data-ar="نقداً">Cash</option>
                                    <option value="credit" data-en="Credit" data-ar="آجل">Credit</option>
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label" data-en="Status" data-ar="الحالة">Status</label>
                                <select name="status" id="edit_status" class="form-select" required>
                                    <option value="unpaid" data-en="Unpaid" data-ar="غير مدفوع">Unpaid</option>
                                    <option value="paid" data-en="Paid" data-ar="مدفوع">Paid</option>
                                    <option value="partially_paid" data-en="Partially Paid" data-ar="مدفوع جزئياً">Partially Paid</option>
                                </select>
                            </div>
                        </div>

                        <div class="mb-4 position-relative">
                            <label class="form-label fw-bold" data-en="Search Product (SKU / Name)" data-ar="بحث عن صنف (باركود / اسم)">Search Product (SKU / Name)</label>
                            <div class="input-group">
                                <span class="input-group-text"><i class="bi bi-search"></i></span>
                                <input type="text" id="editProductSearchInput" class="form-control" placeholder="Search by SKU, Name EN or AR..." data-en="Search by SKU, Name EN or AR..." data-ar="ابحث بالباركود، الاسم الإنجليزي أو العربي...">
                            </div>
                            <div id="editSearchSuggestions" class="list-group position-absolute w-100 shadow-lg" style="z-index: 1050; display: none;"></div>
                        </div>

                        <div class="table-responsive">
                            <table class="table table-bordered">
                                <thead class="bg-light">
                                    <tr>
                                        <th style="width: 40%;" data-en="Item" data-ar="الصنف">Item</th>
                                        <th data-en="Quantity" data-ar="الكمية">Quantity</th>
                                        <th data-en="Unit Price" data-ar="سعر الوحدة">Unit Price</th>
                                        <th data-en="VAT %" data-ar="الضريبة %">VAT %</th>
                                        <th data-en="Total" data-ar="الإجمالي">Total</th>
                                        <th style="width: 50px;"></th>
                                    </tr>
                                </thead>
                                <tbody id="editInvoiceItemsTableBody">
                                    <!-- Rows added dynamically -->
                                </tbody>
                                <tfoot>
                                    <tr>
                                        <td colspan="4" class="text-end fw-bold" data-en="Subtotal" data-ar="الإجمالي">Subtotal</td>
                                        <td class="fw-bold" id="edit_subtotal">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                    <tr>
                                        <td colspan="4" class="text-end fw-bold text-primary" data-en="VAT Amount" data-ar="مبلغ الضريبة">VAT Amount</td>
                                        <td class="fw-bold text-primary" id="edit_totalVat">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                    <tr class="table-dark">
                                        <td colspan="4" class="text-end fw-bold" data-en="Grand Total (Inc. VAT)" data-ar="الإجمالي الكلي (شامل الضريبة)">Grand Total (Inc. VAT)</td>
                                        <td class="fw-bold" id="edit_grandTotal">OMR 0.000</td>
                                        <td></td>
                                    </tr>
                                </tfoot>
                            </table>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                        <button type="submit" name="edit_invoice" class="btn btn-primary" data-en="Update Invoice" data-ar="تحديث الفاتورة">Update Invoice</button>
                    </div>
                </form>
            </div>
        </div>
    </div>
    <div class="modal fade" id="viewInvoiceModal" tabindex="-1">
        <div class="modal-dialog modal-lg">
            <div class="modal-content border-0 shadow">
                <div class="modal-header d-print-none">
                    <h5 class="modal-title" data-en="Tax Invoice Details" data-ar="تفاصيل الفاتورة الضريبية">Tax Invoice Details</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body p-5" id="printableInvoice">
                    <div class="row mb-5 align-items-center">
                        <div class="col-6">
                            <?php if (!empty($data['settings']['company_logo'])): ?>
                                <img src="<?= htmlspecialchars($data['settings']['company_logo']) ?>" alt="Logo" style="height: 80px;" class="mb-3">
                            <?php endif; ?>
                            <h4 class="fw-bold m-0"><?= htmlspecialchars($data['settings']['company_name'] ?? 'My Company') ?></h4>
                            <div class="text-muted small">
                                <?= nl2br(htmlspecialchars($data['settings']['company_address'] ?? '')) ?><br>
                                <?php if(!empty($data['settings']['company_phone'])): ?>
                                    <span data-en="Phone" data-ar="الهاتف">Phone</span>: <?= htmlspecialchars($data['settings']['company_phone']) ?><br>
                                <?php endif; ?>
                                <?php if(!empty($data['settings']['company_email'])): ?>
                                    <span data-en="Email" data-ar="البريد">Email</span>: <?= htmlspecialchars($data['settings']['company_email']) ?><br>
                                <?php endif; ?>
                                <?php if(!empty($data['settings']['vat_number'])): ?>
                                    <span data-en="VAT No" data-ar="الرقم الضريبي">VAT No</span>: <?= htmlspecialchars($data['settings']['vat_number']) ?><br>
                                <?php endif; ?>
                                <?php if(!empty($data['settings']['cr_number'])): ?>
                                    <span data-en="CR No" data-ar="السجل التجاري">CR No</span>: <?= htmlspecialchars($data['settings']['cr_number']) ?><br>
                                <?php endif; ?>
                                <?php if(!empty($data['settings']['registration_no'])): ?>
                                    <span data-en="Reg No" data-ar="رقم التسجيل">Reg No</span>: <?= htmlspecialchars($data['settings']['registration_no']) ?>
                                <?php endif; ?>
                            </div>
                        </div>
                        <div class="col-6 text-end">
                            <h1 class="fw-bold text-uppercase text-primary m-0" data-en="TAX INVOICE" data-ar="فاتورة ضريبية">TAX INVOICE</h1>
                             <div id="invoiceTypeLabel" class="badge bg-primary text-uppercase mb-2"></div>
                             <div id="invoiceStatusLabel" class="badge text-uppercase mb-2"></div>
                            <div class="text-muted small">
                                <div><strong data-en="Invoice #" data-ar="رقم الفاتورة">Invoice #</strong> <span id="invNumber" class="text-dark fw-bold"></span></div>
                                <div><strong data-en="Date" data-ar="التاريخ">Date:</strong> <span id="invDate" class="text-dark"></span></div>
                                <div><strong data-en="Payment" data-ar="الدفع">Payment:</strong> <span id="invPaymentType" class="text-dark"></span></div>
                            </div>
                        </div>
                    </div>

                    <div class="mb-4">
                        <h6 class="fw-bold text-muted text-uppercase small mb-2" id="invPartyLabel" data-en="Bill To" data-ar="فاتورة إلى">Bill To</h6>
                        <div class="h5 m-0" id="invCustomerName"></div>
                        <div class="text-muted small mt-1" id="invCustomerTaxIdContainer" style="display: none;">
                            <span data-en="VAT No / Tax ID" data-ar="الرقم الضريبي">VAT No / Tax ID</span>: <span id="invCustomerTaxId"></span>
                        </div>
                    </div>

                    <table class="table table-bordered mb-4">
                        <thead class="bg-light">
                            <tr>
                                <th data-en="Description" data-ar="الوصف">Description</th>
                                <th class="text-center" data-en="Qty" data-ar="الكمية">Qty</th>
                                <th class="text-end" data-en="Price" data-ar="السعر">Price</th>
                                <th class="text-end" data-en="VAT %" data-ar="الضريبة %">VAT %</th>
                                <th class="text-end" data-en="Total" data-ar="الإجمالي">Total</th>
                            </tr>
                        </thead>
                        <tbody id="invItemsBody">
                            <!-- Items populated by JS -->
                        </tbody>
                        <tfoot>
                            <tr>
                                <td colspan="4" class="text-end fw-bold" data-en="Subtotal" data-ar="الإجمالي">Subtotal</td>
                                <td class="text-end fw-bold" id="invSubtotal"></td>
                            </tr>
                            <tr>
                                <td colspan="4" class="text-end fw-bold" data-en="VAT Amount" data-ar="مبلغ الضريبة">VAT Amount</td>
                                <td class="text-end fw-bold" id="invVatAmount"></td>
                            </tr>
                            <tr class="table-light">
                                <td colspan="4" class="text-end fw-bold" data-en="Total (Inc. VAT)" data-ar="الإجمالي (شامل الضريبة)">Total (Inc. VAT)</td>
                                <td class="text-end fw-bold" id="invGrandTotal"></td>
                            </tr>
                        </tfoot>
                    </table>

                    <div class="row mt-5 align-items-end">
                        <div class="col-6">
                            <div id="invQrCode" class="mb-3">
                                <!-- QR Code image will be injected here -->
                            </div>
                            <div class="text-muted small" data-en="Scan to verify invoice" data-ar="امسح للتحقق من الفاتورة">Scan to verify invoice</div>
                        </div>
                        <div class="col-6 text-end">
                            <?php if(!empty($data['settings']['manager_signature'])): ?>
                                <div class="mb-2">
                                    <img src="<?= htmlspecialchars($data['settings']['manager_signature']) ?>" alt="Signature" style="height: 60px;">
                                </div>
                            <?php endif; ?>
                            <div class="fw-bold"><?= htmlspecialchars($data['settings']['manager_name'] ?? '') ?></div>
                            <div class="text-muted small" data-en="Authorized Manager" data-ar="المدير المعتمد">Authorized Manager</div>
                        </div>
                    </div>

                    <div class="mt-5 pt-5 border-top text-center text-muted small">
                        <?php if(!empty($data['settings']['bank_name']) || !empty($data['settings']['company_iban'])): ?>
                            <div class="mb-3 border rounded p-2 bg-light d-inline-block text-dark">
                                <strong><span data-en="Bank Details" data-ar="تفاصيل البنك">Bank Details</span>:</strong>
                                <?= htmlspecialchars($data['settings']['bank_name'] ?? '') ?> - 
                                <span data-en="IBAN" data-ar="الأيبان">IBAN</span>: <?= htmlspecialchars($data['settings']['company_iban'] ?? '') ?>
                            </div>
                        <?php endif; ?>
                        <p><?= nl2br(htmlspecialchars($data['settings']['invoice_footer'] ?? 'Thank you for your business!')) ?></p>
                    </div>
                </div>
                <div class="modal-footer d-print-none">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Close" data-ar="إغلاق">Close</button>
                    <button type="button" class="btn btn-primary" onclick="window.print()">
                        <i class="bi bi-printer"></i> <span data-en="Print Invoice" data-ar="طباعة الفاتورة">Print Invoice</span>
                    </button>
                </div>
            </div>
        </div>
    </div>

    <!-- Pay Invoice Modal -->
    <div class="modal fade" id="payInvoiceModal" tabindex="-1">
        <div class="modal-dialog">
            <div class="modal-content border-0 shadow">
                <div class="modal-header">
                    <h5 class="modal-title" data-en="Record Payment" data-ar="تسجيل دفعة">Record Payment</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <form method="POST">
                    <input type="hidden" name="invoice_id" id="pay_invoice_id">
                    <div class="modal-body">
                        <div class="mb-3">
                            <label class="form-label" data-en="Invoice Total" data-ar="إجمالي الفاتورة">Invoice Total</label>
                            <input type="text" id="pay_invoice_total" class="form-control-plaintext fw-bold" readonly>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Remaining Amount" data-ar="المبلغ المتبقي">Remaining Amount</label>
                            <input type="text" id="pay_remaining_amount" class="form-control-plaintext text-danger fw-bold" readonly>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Payment Amount" data-ar="مبلغ الدفع">Payment Amount</label>
                            <input type="number" step="0.001" name="amount" id="pay_amount" class="form-control" required>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Payment Date" data-ar="تاريخ الدفع">Payment Date</label>
                            <input type="date" name="payment_date" class="form-control" value="<?= date('Y-m-d') ?>" required>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Payment Method" data-ar="طريقة الدفع">Payment Method</label>
                            <select name="payment_method" class="form-select">
                                <option value="Cash">Cash</option>
                                <option value="Bank Transfer">Bank Transfer</option>
                                <option value="Credit Card">Credit Card</option>
                                <option value="Cheque">Cheque</option>
                            </select>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Notes" data-ar="ملاحظات">Notes</label>
                            <textarea name="notes" class="form-control" rows="2"></textarea>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                        <button type="submit" name="record_payment" class="btn btn-success" data-en="Record Payment" data-ar="حفظ الدفعة">Record Payment</button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- View Payments Modal -->
    <div class="modal fade" id="viewPaymentsModal" tabindex="-1">
        <div class="modal-dialog modal-lg">
            <div class="modal-content border-0 shadow">
                <div class="modal-header">
                    <h5 class="modal-title" data-en="Payment History" data-ar="سجل المدفوعات">Payment History</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body">
                    <div class="table-responsive">
                        <table class="table table-hover">
                            <thead>
                                <tr>
                                    <th data-en="Receipt #" data-ar="رقم السند">Receipt #</th>
                                    <th data-en="Date" data-ar="التاريخ">Date</th>
                                    <th data-en="Method" data-ar="الطريقة">Method</th>
                                    <th data-en="Amount" data-ar="المبلغ" class="text-end">Amount</th>
                                    <th data-en="Actions" data-ar="الإجراءات" class="text-end">Actions</th>
                                </tr>
                            </thead>
                            <tbody id="paymentsTableBody">
                                <!-- Populated via JS -->
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Payment Receipt Modal -->
    <div class="modal fade" id="receiptModal" tabindex="-1">
        <div class="modal-dialog">
            <div class="modal-content border-0 shadow">
                <div class="modal-header d-print-none">
                    <h5 class="modal-title" data-en="Payment Receipt" data-ar="سند قبض">Payment Receipt</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <div class="modal-body p-0" id="printableReceipt">
                    <div class="receipt-container p-4" style="font-family: 'Inter', sans-serif;">
                        <div class="receipt-header text-center mb-4 border-bottom border-dark pb-3">
                            <div class="d-flex justify-content-between align-items-center mb-2">
                                <div class="text-start">
                                    <h4 class="fw-bold mb-0 text-primary"><?= htmlspecialchars($data['settings']['company_name'] ?? 'My Company') ?></h4>
                                    <div class="small text-muted"><?= nl2br(htmlspecialchars($data['settings']['company_address'] ?? '')) ?></div>
                                    <div class="small text-muted">VAT: <?= htmlspecialchars($data['settings']['vat_number'] ?? '') ?></div>
                                </div>
                                <?php if (!empty($data['settings']['company_logo'])): ?>
                                    <img src="<?= htmlspecialchars($data['settings']['company_logo']) ?>" alt="Logo" style="height: 60px;">
                                <?php endif; ?>
                            </div>
                            <h4 class="mt-3 text-uppercase fw-bold letter-spacing-2" data-en="PAYMENT RECEIPT" data-ar="سند قبض">PAYMENT RECEIPT</h4>
                        </div>

                        <div class="receipt-info row g-3 mb-4">
                            <div class="col-6">
                                <div class="p-2 border bg-light">
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Receipt No" data-ar="رقم السند">Receipt No</small>
                                    <span class="fw-bold h6" id="receiptNo">---</span>
                                </div>
                            </div>
                            <div class="col-6 text-end">
                                <div class="p-2 border bg-light">
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Date" data-ar="التاريخ">Date</small>
                                    <span class="fw-bold h6" id="receiptDate">---</span>
                                </div>
                            </div>
                        </div>

                        <div class="receipt-body px-2">
                            <div class="mb-3 border-bottom pb-2">
                                <small class="text-muted d-block text-uppercase small fw-bold" data-en="Received From" data-ar="وصلنا من">Received From</small>
                                <span class="h5 mb-0" id="receiptCustomer">---</span>
                            </div>
                            <div class="row mb-3">
                                <div class="col-6">
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Against Invoice" data-ar="مقابل فاتورة">Against Invoice</small>
                                    <span class="fw-bold" id="receiptInvNo">---</span>
                                </div>
                                <div class="col-6">
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Payment Method" data-ar="طريقة الدفع">Payment Method</small>
                                    <span id="receiptMethod">---</span>
                                </div>
                            </div>
                            <div class="mb-4 p-3 border border-2 border-dark rounded bg-light d-flex justify-content-between align-items-center">
                                <div>
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Amount in Words" data-ar="المبلغ بالحروف">Amount in Words</small>
                                    <span class="fst-italic fw-bold text-dark" id="receiptAmountWords">---</span>
                                </div>
                                <div class="text-end">
                                    <small class="text-muted d-block text-uppercase small fw-bold" data-en="Total Amount" data-ar="الإجمالي">Total Amount</small>
                                    <span class="h4 fw-bold text-primary mb-0" id="receiptAmount">OMR 0.000</span>
                                </div>
                            </div>
                            <div class="mb-4" id="receiptNotesContainer" style="display:none;">
                                <small class="text-muted d-block text-uppercase small fw-bold" data-en="Notes" data-ar="ملاحظات">Notes</small>
                                <div class="p-2 border rounded bg-white small" id="receiptNotes">---</div>
                            </div>
                        </div>

                        <div class="receipt-footer mt-5 pt-4">
                            <div class="row">
                                <div class="col-6 text-center">
                                    <div style="height: 60px;"></div>
                                    <div class="border-top border-dark pt-2 mx-4 small fw-bold" data-en="Customer Signature" data-ar="توقيع العميل">Customer Signature</div>
                                </div>
                                <div class="col-6 text-center">
                                    <div style="height: 60px;">
                                        <?php if (!empty($data['settings']['manager_signature'])): ?>
                                            <img src="<?= htmlspecialchars($data['settings']['manager_signature']) ?>" alt="Signature" style="max-height: 50px;">
                                        <?php endif; ?>
                                    </div>
                                    <div class="border-top border-dark pt-2 mx-4 small fw-bold" data-en="Authorized Signature" data-ar="توقيع المعتمد">Authorized Signature</div>
                                </div>
                            </div>
                            <div class="text-center mt-4 small text-muted border-top pt-2">
                                <?= htmlspecialchars($data['settings']['invoice_footer'] ?? '') ?>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="modal-footer d-print-none">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Close" data-ar="إغلاق">Close</button>
                    <button type="button" class="btn btn-primary" onclick="printReceipt()">
                        <i class="bi bi-printer"></i> <span data-en="Print Receipt" data-ar="طباعة السند">Print Receipt</span>
                    </button>
                </div>
            </div>
        </div>
    </div>

    <?php elseif ($page === 'settings'): ?>
    <div class="card p-4">
        <h5 class="mb-4" data-en="Company Settings" data-ar="إعدادات الشركة">Company Settings</h5>
        <form method="POST" enctype="multipart/form-data">
            <div class="row g-4">
                <div class="col-md-6">
                    <div class="card p-3 bg-light border-0">
                        <h6 class="mb-3 fw-bold" data-en="Profile Information" data-ar="معلومات الملف الشخصي">Profile Information</h6>
                        <div class="mb-3">
                            <label class="form-label" data-en="Company Name" data-ar="اسم الشركة">Company Name</label>
                            <input type="text" name="settings[company_name]" class="form-control" value="<?= htmlspecialchars($data['settings']['company_name'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Company Logo" data-ar="شعار الشركة">Company Logo</label>
                            <?php if (!empty($data['settings']['company_logo'])): ?>
                                <div class="mb-2">
                                    <img src="<?= htmlspecialchars($data['settings']['company_logo']) ?>" alt="Logo" style="height: 50px;" class="rounded border">
                                </div>
                            <?php endif; ?>
                            <input type="file" name="company_logo" class="form-control" accept="image/*">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Favicon" data-ar="أيقونة الموقع">Favicon</label>
                            <?php if (!empty($data['settings']['favicon'])): ?>
                                <div class="mb-2">
                                    <img src="<?= htmlspecialchars($data['settings']['favicon']) ?>" alt="Favicon" style="height: 32px;" class="rounded border">
                                </div>
                            <?php endif; ?>
                            <input type="file" name="favicon" class="form-control" accept="image/x-icon,image/png,image/gif">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Phone" data-ar="الهاتف">Phone</label>
                            <input type="text" name="settings[company_phone]" class="form-control" value="<?= htmlspecialchars($data['settings']['company_phone'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Company Email" data-ar="البريد الإلكتروني للشركة">Company Email</label>
                            <input type="email" name="settings[company_email]" class="form-control" value="<?= htmlspecialchars($data['settings']['company_email'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Website" data-ar="الموقع الإلكتروني">Website</label>
                            <input type="url" name="settings[company_website]" class="form-control" value="<?= htmlspecialchars($data['settings']['company_website'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Manager Name" data-ar="اسم المدير">Manager Name</label>
                            <input type="text" name="settings[manager_name]" class="form-control" value="<?= htmlspecialchars($data['settings']['manager_name'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Manager Signature" data-ar="توقيع المدير">Manager Signature</label>
                            <?php if (!empty($data['settings']['manager_signature'])): ?>
                                <div class="mb-2">
                                    <img src="<?= htmlspecialchars($data['settings']['manager_signature']) ?>" alt="Signature" style="height: 50px;" class="rounded border">
                                </div>
                            <?php endif; ?>
                            <input type="file" name="manager_signature" class="form-control" accept="image/*">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Address" data-ar="العنوان">Address</label>
                            <textarea name="settings[company_address]" class="form-control" rows="2"><?= htmlspecialchars($data['settings']['company_address'] ?? '') ?></textarea>
                        </div>
                    </div>
                </div>
                <div class="col-md-6">
                    <div class="card p-3 bg-light border-0">
                        <h6 class="mb-3 fw-bold" data-en="Legal & Tax Details" data-ar="التفاصيل القانونية والضريبية">Legal & Tax Details</h6>
                        <div class="mb-3">
                            <label class="form-label" data-en="VAT Number" data-ar="الرقم الضريبي">VAT Number</label>
                            <input type="text" name="settings[vat_number]" class="form-control" value="<?= htmlspecialchars($data['settings']['vat_number'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="CR Number" data-ar="السجل التجاري">CR Number</label>
                            <input type="text" name="settings[cr_number]" class="form-control" value="<?= htmlspecialchars($data['settings']['cr_number'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Registration Number" data-ar="رقم التسجيل">Registration Number</label>
                            <input type="text" name="settings[registration_no]" class="form-control" value="<?= htmlspecialchars($data['settings']['registration_no'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Bank Name" data-ar="اسم البنك">Bank Name</label>
                            <input type="text" name="settings[bank_name]" class="form-control" value="<?= htmlspecialchars($data['settings']['bank_name'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="IBAN" data-ar="رقم الأيبان">IBAN</label>
                            <input type="text" name="settings[company_iban]" class="form-control" value="<?= htmlspecialchars($data['settings']['company_iban'] ?? '') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Default VAT Rate (%)" data-ar="نسبة الضريبة الافتراضية (%)">Default VAT Rate (%)</label>
                            <input type="number" step="0.001" name="settings[default_vat_rate]" class="form-control" value="<?= htmlspecialchars($data['settings']['default_vat_rate'] ?? '15.00') ?>">
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Invoice Footer Note" data-ar="ملاحظة أسفل الفاتورة">Invoice Footer Note</label>
                            <textarea name="settings[invoice_footer]" class="form-control" rows="2"><?= htmlspecialchars($data['settings']['invoice_footer'] ?? '') ?></textarea>
                        </div>
                    </div>
                </div>
            </div>
            <div class="mt-4 text-end">
                <button type="submit" name="update_settings" class="btn btn-primary px-5">
                    <i class="bi bi-save"></i> <span data-en="Save Settings" data-ar="حفظ الإعدادات">Save Settings</span>
                </button>
            </div>
        </form>
    </div>
    <?php elseif ($page === 'payment_methods'): ?>
    <div class="card p-4">
        <div class="d-flex justify-content-between align-items-center mb-4">
            <h5 class="m-0" data-en="Payment Methods" data-ar="طرق الدفع">Payment Methods</h5>
            <button class="btn btn-primary" data-bs-toggle="modal" data-bs-target="#addPaymentMethodModal">
                <i class="bi bi-plus-lg"></i> <span data-en="Add Payment Method" data-ar="إضافة طريقة دفع">Add Payment Method</span>
            </button>
        </div>
        <div class="table-responsive">
            <table class="table table-hover align-middle">
                <thead>
                    <tr>
                        <th data-en="ID" data-ar="المعرف">ID</th>
                        <th data-en="Name (EN)" data-ar="الاسم (EN)">Name (EN)</th>
                        <th data-en="Name (AR)" data-ar="الاسم (AR)">Name (AR)</th>
                        <th data-en="Actions" data-ar="الإجراءات" class="text-end">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($data['payment_methods'] as $pm): ?>
                    <tr>
                        <td><?= $pm['id'] ?></td>
                        <td><?= htmlspecialchars($pm['name_en'] ?? '') ?></td>
                        <td><?= htmlspecialchars($pm['name_ar'] ?? '') ?></td>
                        <td class="text-end">
                            <div class="btn-group btn-group-sm">
                                <button class="btn btn-outline-primary" title="Edit" data-bs-toggle="modal" data-bs-target="#editPaymentMethodModal<?= $pm['id'] ?>"><i class="bi bi-pencil"></i></button>
                                <form method="POST" class="d-inline" onsubmit="return confirm('Are you sure?')">
                                    <input type="hidden" name="id" value="<?= $pm['id'] ?>">
                                    <button type="submit" name="delete_payment_method" class="btn btn-outline-danger" title="Delete"><i class="bi bi-trash"></i></button>
                                </form>
                            </div>

                            <!-- Edit Payment Method Modal -->
                            <div class="modal fade" id="editPaymentMethodModal<?= $pm['id'] ?>" tabindex="-1">
                                <div class="modal-dialog">
                                    <div class="modal-content border-0 shadow text-start">
                                        <div class="modal-header">
                                            <h5 class="modal-title" data-en="Edit Payment Method" data-ar="تعديل طريقة الدفع">Edit Payment Method</h5>
                                            <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                                        </div>
                                        <form method="POST">
                                            <input type="hidden" name="id" value="<?= $pm['id'] ?>">
                                            <div class="modal-body">
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Name (EN)" data-ar="الاسم (EN)">Name (EN)</label>
                                                    <input type="text" name="name_en" class="form-control" value="<?= htmlspecialchars($pm['name_en'] ?? '') ?>" required>
                                                </div>
                                                <div class="mb-3">
                                                    <label class="form-label" data-en="Name (AR)" data-ar="الاسم (AR)">Name (AR)</label>
                                                    <input type="text" name="name_ar" class="form-control" value="<?= htmlspecialchars($pm['name_ar'] ?? '') ?>" required>
                                                </div>
                                            </div>
                                            <div class="modal-footer">
                                                <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                                                <button type="submit" name="edit_payment_method" class="btn btn-primary" data-en="Update" data-ar="تحديث">Update</button>
                                            </div>
                                        </form>
                                    </div>
                                </div>
                            </div>
                        </td>
                    </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>
        </div>
    </div>

    <!-- Add Payment Method Modal -->
    <div class="modal fade" id="addPaymentMethodModal" tabindex="-1">
        <div class="modal-dialog">
            <div class="modal-content border-0 shadow">
                <div class="modal-header">
                    <h5 class="modal-title" data-en="Add Payment Method" data-ar="إضافة طريقة دفع">Add Payment Method</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                </div>
                <form method="POST">
                    <div class="modal-body">
                        <div class="mb-3">
                            <label class="form-label" data-en="Name (EN)" data-ar="الاسم (EN)">Name (EN)</label>
                            <input type="text" name="name_en" class="form-control" required>
                        </div>
                        <div class="mb-3">
                            <label class="form-label" data-en="Name (AR)" data-ar="الاسم (AR)">Name (AR)</label>
                            <input type="text" name="name_ar" class="form-control" required>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                        <button type="submit" name="add_payment_method" class="btn btn-primary" data-en="Save" data-ar="حفظ">Save</button>
                    </div>
                </form>
            </div>
        </div>
    </div>
    <?php endif; ?>
</div>

<!-- Add Customer Modal -->
<div class="modal fade" id="addCustomerModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title">
                    <?php if ($page === 'suppliers'): ?>
                        <span data-en="Add New Supplier" data-ar="إضافة مورد جديد">Add New Supplier</span>
                    <?php else: ?>
                        <span data-en="Add New Customer" data-ar="إضافة عميل جديد">Add New Customer</span>
                    <?php endif; ?>
                </h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST">
                <input type="hidden" name="type" value="<?= $page === 'suppliers' ? 'supplier' : 'customer' ?>">
                <div class="modal-body">
                    <div class="mb-3">
                        <label class="form-label" data-en="Name" data-ar="الاسم">Name</label>
                        <input type="text" name="name" class="form-control" required>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Email" data-ar="البريد الإلكتروني">Email</label>
                        <input type="email" name="email" class="form-control">
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Phone" data-ar="الهاتف">Phone</label>
                        <input type="text" name="phone" class="form-control">
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Tax ID / VAT No" data-ar="الرقم الضريبي">Tax ID / VAT No</label>
                        <input type="text" name="tax_id" class="form-control">
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Initial Balance" data-ar="الرصيد الافتتاحي">Initial Balance</label>
                        <input type="number" step="0.001" name="balance" class="form-control" value="0.000">
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="add_customer" class="btn btn-primary" data-en="Save" data-ar="حفظ">Save</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Add Item Modal -->
<div class="modal fade" id="addItemModal" tabindex="-1">
    <div class="modal-dialog modal-lg">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Add New Item" data-ar="إضافة صنف جديد">Add New Item</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="row g-3">
                        <div class="col-md-6">
                            <label class="form-label" data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</label>
                            <input type="text" name="name_en" class="form-control" required>
                        </div>
                        <div class="col-md-6">
                            <label class="form-label" data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</label>
                            <input type="text" name="name_ar" class="form-control" required>
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Category" data-ar="الفئة">Category</label>
                            <select name="category_id" class="form-select">
                                <option value="">---</option>
                                <?php foreach ($data['categories'] ?? [] as $c): ?>
                                <option value="<?= $c['id'] ?>"><?= htmlspecialchars($c['name_en']) ?> / <?= htmlspecialchars($c['name_ar']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Unit" data-ar="الوحدة">Unit</label>
                            <select name="unit_id" class="form-select">
                                <option value="">---</option>
                                <?php foreach ($data['units'] ?? [] as $u): ?>
                                <option value="<?= $u['id'] ?>"><?= htmlspecialchars($u['short_name_en']) ?> / <?= htmlspecialchars($u['short_name_ar']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Supplier" data-ar="المورد">Supplier</label>
                            <select name="supplier_id" class="form-select">
                                <option value="">---</option>
                                <?php foreach ($data['suppliers'] ?? [] as $s): ?>
                                <option value="<?= $s['id'] ?>"><?= htmlspecialchars($s['name']) ?></option>
                                <?php endforeach; ?>
                            </select>
                        </div>
                        <div class="col-md-6">
                            <label class="form-label" data-en="SKU / Barcode" data-ar="الباركود">SKU / Barcode</label>
                            <div class="input-group">
                                <input type="text" name="sku" id="skuInput" class="form-control">
                                <button class="btn btn-outline-secondary" type="button" id="suggestSkuBtn" data-en="Suggest" data-ar="اقتراح">Suggest</button>
                            </div>
                        </div>
                        <div class="col-md-3">
                            <label class="form-label" data-en="Sale Price" data-ar="سعر البيع">Sale Price</label>
                            <input type="number" step="0.001" name="sale_price" class="form-control" value="0.000">
                        </div>
                        <div class="col-md-3">
                            <label class="form-label" data-en="Purchase Price" data-ar="سعر الشراء">Purchase Price</label>
                            <input type="number" step="0.001" name="purchase_price" class="form-control" value="0.000">
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Initial Stock" data-ar="المخزون الحالي">Initial Stock</label>
                            <input type="number" step="0.001" name="stock_quantity" class="form-control" value="0.000">
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Min Stock Level" data-ar="الحد الأدنى للمخزون">Min Stock Level</label>
                            <input type="number" step="0.001" name="min_stock_level" class="form-control" value="0.000">
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="Item Picture" data-ar="صورة الصنف">Item Picture</label>
                            <input type="file" name="image" class="form-control" accept="image/*">
                        </div>
                        <div class="col-md-4">
                            <label class="form-label" data-en="VAT Rate (%)" data-ar="ضريبة القيمة المضافة (%)">VAT Rate (%)</label>
                            <input type="number" step="0.001" name="vat_rate" class="form-control" value="15.00">
                        </div>
                        <div class="col-md-8">
                            <div class="form-check form-switch mt-4">
                                <input class="form-check-input" type="checkbox" id="hasExpiryToggle">
                                <label class="form-check-label" for="hasExpiryToggle" data-en="Has Expiry Date?" data-ar="هل له تاريخ انتهاء؟">Has Expiry Date?</label>
                            </div>
                        </div>
                        <div class="col-md-6" id="expiryDateContainer" style="display: none;">
                            <label class="form-label" data-en="Expiry Date" data-ar="تاريخ الانتهاء">Expiry Date</label>
                            <input type="date" name="expiry_date" class="form-control">
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="add_item" class="btn btn-primary" data-en="Save Item" data-ar="حفظ الصنف">Save Item</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Import Items Modal -->
<div class="modal fade" id="importItemsModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow text-start">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Import Items from Excel (CSV)" data-ar="استيراد الأصناف من اكسل (CSV)">Import Items from Excel (CSV)</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="alert alert-info py-2">
                        <small data-en="Please upload a CSV file with the following columns: SKU, English Name, Arabic Name, Sale Price, Cost Price." data-ar="يرجى رفع ملف CSV بالأعمدة التالية: الباركود، الاسم الإنجليزي، الاسم العربي، سعر البيع، سعر التكلفة.">
                            Please upload a CSV file with the following columns: SKU, English Name, Arabic Name, Sale Price, Cost Price.
                        </small>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Choose CSV File" data-ar="اختر ملف CSV">Choose CSV File</label>
                        <input type="file" name="excel_file" class="form-control" accept=".csv" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="import_items" class="btn btn-success" data-en="Import Now" data-ar="استيراد الآن">Import Now</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Import Customers Modal -->
<div class="modal fade" id="importCustomersModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow text-start">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Import Customers from Excel (CSV)" data-ar="استيراد العملاء من اكسل (CSV)">Import Customers from Excel (CSV)</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="alert alert-info py-2">
                        <small data-en="Please upload a CSV file with the following columns: Name, Email, Phone, Tax ID, Balance." data-ar="يرجى رفع ملف CSV بالأعمدة التالية: الاسم، البريد الإلكتروني، الهاتف، الرقم الضريبي، الرصيد.">
                            Please upload a CSV file with the following columns: Name, Email, Phone, Tax ID, Balance.
                        </small>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Choose CSV File" data-ar="اختر ملف CSV">Choose CSV File</label>
                        <input type="file" name="excel_file" class="form-control" accept=".csv" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="import_customers" class="btn btn-success" data-en="Import Now" data-ar="استيراد الآن">Import Now</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Import Suppliers Modal -->
<div class="modal fade" id="importSuppliersModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow text-start">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Import Suppliers from Excel (CSV)" data-ar="استيراد الموردين من اكسل (CSV)">Import Suppliers from Excel (CSV)</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="alert alert-info py-2">
                        <small data-en="Please upload a CSV file with the following columns: Name, Email, Phone, Tax ID, Balance." data-ar="يرجى رفع ملف CSV بالأعمدة التالية: الاسم، البريد الإلكتروني، الهاتف، الرقم الضريبي، الرصيد.">
                            Please upload a CSV file with the following columns: Name, Email, Phone, Tax ID, Balance.
                        </small>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Choose CSV File" data-ar="اختر ملف CSV">Choose CSV File</label>
                        <input type="file" name="excel_file" class="form-control" accept=".csv" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="import_suppliers" class="btn btn-success" data-en="Import Now" data-ar="استيراد الآن">Import Now</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Import Categories Modal -->
<div class="modal fade" id="importCategoriesModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow text-start">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Import Categories from Excel (CSV)" data-ar="استيراد الفئات من اكسل (CSV)">Import Categories from Excel (CSV)</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="alert alert-info py-2">
                        <small data-en="Please upload a CSV file with the following columns: Name (EN), Name (AR)." data-ar="يرجى رفع ملف CSV بالأعمدة التالية: الاسم (إنجليزي)، الاسم (عربي).">
                            Please upload a CSV file with the following columns: Name (EN), Name (AR).
                        </small>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Choose CSV File" data-ar="اختر ملف CSV">Choose CSV File</label>
                        <input type="file" name="excel_file" class="form-control" accept=".csv" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="import_categories" class="btn btn-success" data-en="Import Now" data-ar="استيراد الآن">Import Now</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Import Units Modal -->
<div class="modal fade" id="importUnitsModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow text-start">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Import Units from Excel (CSV)" data-ar="استيراد الوحدات من اكسل (CSV)">Import Units from Excel (CSV)</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST" enctype="multipart/form-data">
                <div class="modal-body">
                    <div class="alert alert-info py-2">
                        <small data-en="Please upload a CSV file with the following columns: Name (EN), Name (AR), Short (EN), Short (AR)." data-ar="يرجى رفع ملف CSV بالأعمدة التالية: الاسم (إنجليزي)، الاسم (عربي)، الاختصار (إنجليزي)، الاختصار (عربي).">
                            Please upload a CSV file with the following columns: Name (EN), Name (AR), Short (EN), Short (AR).
                        </small>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Choose CSV File" data-ar="اختر ملف CSV">Choose CSV File</label>
                        <input type="file" name="excel_file" class="form-control" accept=".csv" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="import_units" class="btn btn-success" data-en="Import Now" data-ar="استيراد الآن">Import Now</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Add Category Modal -->
<div class="modal fade" id="addCategoryModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Add Category" data-ar="إضافة فئة">Add Category</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST">
                <div class="modal-body">
                    <div class="mb-3">
                        <label class="form-label" data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</label>
                        <input type="text" name="name_en" class="form-control" required>
                    </div>
                    <div class="mb-3">
                        <label class="form-label" data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</label>
                        <input type="text" name="name_ar" class="form-control" required>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="add_category" class="btn btn-primary" data-en="Save" data-ar="حفظ">Save</button>
                </div>
            </form>
        </div>
    </div>
</div>

<!-- Add Unit Modal -->
<div class="modal fade" id="addUnitModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content border-0 shadow">
            <div class="modal-header">
                <h5 class="modal-title" data-en="Add Unit" data-ar="إضافة وحدة">Add Unit</h5>
                <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
            </div>
            <form method="POST">
                <div class="modal-body">
                    <div class="row g-3">
                        <div class="col-md-6">
                            <label class="form-label" data-en="Name (EN)" data-ar="الاسم (إنجليزي)">Name (EN)</label>
                            <input type="text" name="name_en" class="form-control" required>
                        </div>
                        <div class="col-md-6">
                            <label class="form-label" data-en="Short Name (EN)" data-ar="الاختصار (إنجليزي)">Short (EN)</label>
                            <input type="text" name="short_en" class="form-control" required placeholder="e.g. Kg">
                        </div>
                        <div class="col-md-6">
                            <label class="form-label" data-en="Name (AR)" data-ar="الاسم (عربي)">Name (AR)</label>
                            <input type="text" name="name_ar" class="form-control" required>
                        </div>
                        <div class="col-md-6">
                            <label class="form-label" data-en="Short Name (AR)" data-ar="الاختصار (عربي)">Short (AR)</label>
                            <input type="text" name="short_ar" class="form-control" required placeholder="مثلاً: كجم">
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-light" data-bs-dismiss="modal" data-en="Cancel" data-ar="إلغاء">Cancel</button>
                    <button type="submit" name="add_unit" class="btn btn-primary" data-en="Save" data-ar="حفظ">Save</button>
                </div>
            </form>
        </div>
    </div>
</div>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const hasExpiryToggle = document.getElementById('hasExpiryToggle');
    const expiryDateContainer = document.getElementById('expiryDateContainer');
    const suggestSkuBtn = document.getElementById('suggestSkuBtn');
    const skuInput = document.getElementById('skuInput');

    // Toggle Expiry Date visibility
    if (hasExpiryToggle && expiryDateContainer) {
        hasExpiryToggle.addEventListener('change', function() {
            expiryDateContainer.style.display = this.checked ? 'block' : 'none';
            if (!this.checked) {
                expiryDateContainer.querySelector('input').value = '';
            }
        });
    }

    // Pay Invoice Logic
    document.querySelectorAll('.pay-invoice-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const id = this.getAttribute('data-id');
            const total = parseFloat(this.getAttribute('data-total'));
            const paid = parseFloat(this.getAttribute('data-paid') || 0);
            const remaining = total - paid;

            document.getElementById('pay_invoice_id').value = id;
            document.getElementById('pay_invoice_total').value = `OMR ${total.toFixed(3)}`;
            document.getElementById('pay_remaining_amount').value = `OMR ${remaining.toFixed(3)}`;
            document.getElementById('pay_amount').value = remaining.toFixed(3);
            document.getElementById('pay_amount').max = remaining.toFixed(3);
        });
    });

    // Show receipt modal if needed
    <?php if (isset($_SESSION['trigger_receipt_modal'])): 
        $rid = (int)$_SESSION['show_receipt_id'];
        unset($_SESSION['trigger_receipt_modal']);
    ?>
    showReceipt(<?= $rid ?>);
    <?php endif; ?>

    window.showReceipt = function(paymentId) {
        fetch(`index.php?action=get_payment_details&payment_id=${paymentId}`)
            .then(res => res.json())
            .then(data => {
                if (!data) return;
                document.getElementById('receiptNo').textContent = 'RCP-' + data.id.toString().padStart(5, '0');
                document.getElementById('receiptDate').textContent = data.payment_date;
                document.getElementById('receiptCustomer').textContent = data.customer_name || '---';
                document.getElementById('receiptInvNo').textContent = 'INV-' + data.inv_id.toString().padStart(5, '0');
                document.getElementById('receiptMethod').textContent = data.payment_method;
                document.getElementById('receiptAmount').textContent = 'OMR ' + parseFloat(data.amount).toFixed(3);
                document.getElementById('receiptAmountWords').textContent = data.amount_words;
                
                const notesContainer = document.getElementById('receiptNotesContainer');
                if (data.notes) {
                    document.getElementById('receiptNotes').textContent = data.notes;
                    notesContainer.style.display = 'block';
                } else {
                    notesContainer.style.display = 'none';
                }
                
                const receiptModal = new bootstrap.Modal(document.getElementById('receiptModal'));
                receiptModal.show();
            });
    };

    document.querySelectorAll('.view-payments-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const invoiceId = this.getAttribute('data-id');
            const tbody = document.getElementById('paymentsTableBody');
            tbody.innerHTML = '<tr><td colspan="5" class="text-center">Loading...</td></tr>';
            
            fetch(`index.php?action=get_payments&invoice_id=${invoiceId}`)
                .then(res => res.json())
                .then(data => {
                    tbody.innerHTML = '';
                    if (data.length === 0) {
                        tbody.innerHTML = '<tr><td colspan="5" class="text-center">No payments found.</td></tr>';
                        return;
                    }
                    data.forEach(p => {
                        const tr = document.createElement('tr');
                        tr.innerHTML = `
                            <td>RCP-${p.id.toString().padStart(5, '0')}</td>
                            <td>${p.payment_date}</td>
                            <td>${p.payment_method}</td>
                            <td class="text-end fw-bold">OMR ${parseFloat(p.amount).toFixed(3)}</td>
                            <td class="text-end">
                                <button class="btn btn-sm btn-outline-primary" onclick="showReceipt(${p.id})">
                                    <i class="bi bi-printer"></i>
                                </button>
                            </td>
                        `;
                        tbody.appendChild(tr);
                    });
                });
        });
    });

    window.printReceipt = function() {
        const content = document.getElementById('printableReceipt').innerHTML;
        const originalContent = document.body.innerHTML;
        document.body.innerHTML = content;
        window.print();
        document.body.innerHTML = originalContent;
        window.location.reload();
    };

    // Handle Expiry toggle in Edit Modals
    document.querySelectorAll('.hasExpiryToggleEdit').forEach(toggle => {
        toggle.addEventListener('change', function() {
            const container = this.closest('.row').querySelector('.expiryDateContainerEdit');
            if (container) {
                container.style.display = this.checked ? 'block' : 'none';
                if (!this.checked) {
                    container.querySelector('input').value = '';
                }
            }
        });
    });

    // Invoice Form Logic
    const initInvoiceForm = (searchInputId, suggestionsId, tableBodyId, grandTotalId, subtotalId, totalVatId) => {
        const searchInput = document.getElementById(searchInputId);
        const suggestions = document.getElementById(suggestionsId);
        const tableBody = document.getElementById(tableBodyId);
        const grandTotalEl = document.getElementById(grandTotalId);
        const subtotalEl = document.getElementById(subtotalId);
        const totalVatEl = document.getElementById(totalVatId);

        if (!searchInput || !tableBody) return;

        let timeout = null;
        searchInput.addEventListener('input', function() {
            clearTimeout(timeout);
            const q = this.value.trim();
            if (q.length < 1) {
                suggestions.style.display = 'none';
                return;
            }

            timeout = setTimeout(() => {
                fetch(`index.php?action=search_items&q=${encodeURIComponent(q)}`)
                    .then(res => res.json())
                    .then(data => {
                        suggestions.innerHTML = '';
                        if (data.length > 0) {
                            data.forEach(item => {
                                const btn = document.createElement('button');
                                btn.type = 'button';
                                btn.className = 'list-group-item list-group-item-action';
                                btn.innerHTML = `
                                    <div class="d-flex justify-content-between">
                                        <span><strong>${item.sku}</strong> - ${item.name_en} / ${item.name_ar}</span>
                                        <span class="text-muted small">Stock: ${item.stock_quantity}</span>
                                    </div>
                                `;
                                btn.onclick = () => addItemToTable(item, tableBody, searchInput, suggestions, grandTotalEl, subtotalEl, totalVatEl);
                                suggestions.appendChild(btn);
                            });
                            suggestions.style.display = 'block';
                        } else {
                            suggestions.style.display = 'none';
                        }
                    });
            }, 300);
        });

        // Close suggestions when clicking outside
        document.addEventListener('click', function(e) {
            if (!searchInput.contains(e.target) && !suggestions.contains(e.target)) {
                suggestions.style.display = 'none';
            }
        });
    };

    function addItemToTable(item, tableBody, searchInput, suggestions, grandTotalEl, subtotalEl, totalVatEl, customData = null) {
        if (suggestions) suggestions.style.display = 'none';
        if (searchInput) searchInput.value = '';
        
        const existingRow = Array.from(tableBody.querySelectorAll('.item-id-input')).find(input => input.value == item.id);
        if (existingRow && !customData) {
            const row = existingRow.closest('tr');
            const qtyInput = row.querySelector('.item-qty');
            qtyInput.value = parseFloat(qtyInput.value) + 1;
            recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl);
            return;
        }

        const row = document.createElement('tr');
        row.className = 'item-row';
        const price = customData ? customData.unit_price : (invoiceType === 'sale' ? item.sale_price : item.purchase_price);
        const qty = customData ? customData.quantity : 1;
        const vatRate = item.vat_rate || 0;
        
        row.innerHTML = `
            <td>
                <input type="hidden" name="item_ids[]" class="item-id-input" value="${item.id}">
                <input type="hidden" class="item-vat-rate" value="${vatRate}">
                <div><strong>${item.name_en}</strong></div>
                <div class="small text-muted">${item.name_ar} (${item.sku})</div>
            </td>
            <td><input type="number" step="0.001" name="quantities[]" class="form-control item-qty" value="${qty}" required></td>
            <td><input type="number" step="0.001" name="prices[]" class="form-control item-price" value="${price}" required></td>
            <td><input type="text" class="form-control bg-light" value="${vatRate}%" readonly></td>
            <td><input type="number" step="0.001" class="form-control item-total" value="${(qty * price).toFixed(3)}" readonly></td>
            <td><button type="button" class="btn btn-outline-danger btn-sm remove-row"><i class="bi bi-trash"></i></button></td>
        `;
        
        tableBody.appendChild(row);
        attachRowListeners(row, tableBody, grandTotalEl, subtotalEl, totalVatEl);
        recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl);
    }

    function recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl) {
        let subtotal = 0;
        let totalVat = 0;
        tableBody.querySelectorAll('.item-row').forEach(row => {
            const qty = parseFloat(row.querySelector('.item-qty').value) || 0;
            const price = parseFloat(row.querySelector('.item-price').value) || 0;
            const vatRate = parseFloat(row.querySelector('.item-vat-rate').value) || 0;
            
            const total = qty * price;
            const vatAmount = total * (vatRate / 100);
            
            row.querySelector('.item-total').value = total.toFixed(3);
            subtotal += total;
            totalVat += vatAmount;
        });
        const grandTotal = subtotal + totalVat;
        
        if (subtotalEl) subtotalEl.textContent = 'OMR ' + subtotal.toFixed(3);
        if (totalVatEl) totalVatEl.textContent = 'OMR ' + totalVat.toFixed(3);
        if (grandTotalEl) grandTotalEl.textContent = 'OMR ' + grandTotal.toFixed(3);
    }

    function attachRowListeners(row, tableBody, grandTotalEl, subtotalEl, totalVatEl) {
        row.querySelector('.item-qty').addEventListener('input', () => recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl));
        row.querySelector('.item-price').addEventListener('input', () => recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl));
        row.querySelector('.remove-row').addEventListener('click', function() {
            row.remove();
            recalculate(tableBody, grandTotalEl, subtotalEl, totalVatEl);
        });
    }

    const invoiceType = '<?= $page === "sales" ? "sale" : ($page === "purchases" ? "purchase" : "") ?>';
    initInvoiceForm('productSearchInput', 'searchSuggestions', 'invoiceItemsTableBody', 'grandTotal', 'subtotal', 'totalVat');
    initInvoiceForm('editProductSearchInput', 'editSearchSuggestions', 'editInvoiceItemsTableBody', 'edit_grandTotal', 'edit_subtotal', 'edit_totalVat');

    // Edit Invoice Logic
    document.querySelectorAll('.edit-invoice-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const data = JSON.parse(this.dataset.json);
            document.getElementById('edit_invoice_id').value = data.id;
            document.getElementById('edit_customer_id').value = data.customer_id;
            document.getElementById('edit_invoice_date').value = data.invoice_date;
            document.getElementById('edit_payment_type').value = data.payment_type || 'cash';
            document.getElementById('edit_status').value = data.status || 'unpaid';
            
            const tableBody = document.getElementById('editInvoiceItemsTableBody');
            tableBody.innerHTML = '';
            
            data.items.forEach(item => {
                // We need more data than what's in invoice_items (like SKU and names, but we have them from the join in PHP)
                // The dataset-json already contains name_en, name_ar etc because of the PHP logic at line 1093
                const itemMeta = {
                    id: item.item_id,
                    name_en: item.name_en,
                    name_ar: item.name_ar,
                    sku: '', // Optional, or fetch if needed
                    vat_rate: 0 // Will be handled if we have it in the join
                };

                // Fetch current item details to get VAT rate if possible, or use stored if available
                // For simplicity, let's assume we want to use the item's current VAT rate or store it.
                // Looking at the join at line 1093, it doesn't fetch vat_rate. Let's fix that in PHP too.
                
                addItemToTable({
                    id: item.item_id,
                    name_en: item.name_en,
                    name_ar: item.name_ar,
                    sku: '',
                    vat_rate: item.vat_rate || 0 // We'll add this to PHP join
                }, tableBody, null, null, 
                document.getElementById('edit_grandTotal'), 
                document.getElementById('edit_subtotal'), 
                document.getElementById('edit_totalVat'),
                { quantity: item.quantity, unit_price: item.unit_price });
            });
        });
    });

    // View Invoice Logic
    document.querySelectorAll('.view-invoice-btn').forEach(btn => {
        btn.addEventListener('click', function() {
            const data = JSON.parse(this.dataset.json);
            document.getElementById('invNumber').textContent = 'INV-' + data.id.toString().padStart(5, '0');
            document.getElementById('invDate').textContent = data.invoice_date;
            document.getElementById('invPaymentType').textContent = data.payment_type ? data.payment_type.toUpperCase() : 'CASH';
            document.getElementById('invCustomerName').textContent = data.customer_name || '---';
            
            const taxIdEl = document.getElementById('invCustomerTaxId');
            const taxIdContainer = document.getElementById('invCustomerTaxIdContainer');
            if (data.customer_tax_id) {
                taxIdEl.textContent = data.customer_tax_id;
                taxIdContainer.style.display = 'block';
            } else {
                taxIdContainer.style.display = 'none';
            }

            document.getElementById('invPartyLabel').textContent = data.type === 'sale' ? 'Bill To' : 'Bill From';
            document.getElementById('invPartyLabel').setAttribute('data-en', data.type === 'sale' ? 'Bill To' : 'Bill From');
            document.getElementById('invPartyLabel').setAttribute('data-ar', data.type === 'sale' ? 'فاتورة إلى' : 'فاتورة من');
            document.getElementById('invoiceTypeLabel').textContent = data.type;
            document.getElementById('invoiceTypeLabel').className = 'badge text-uppercase ' + (data.type === 'sale' ? 'bg-success' : 'bg-warning');
            
            const statusLabel = document.getElementById('invoiceStatusLabel');
            let statusClass = 'bg-secondary';
            let statusEn = data.status.charAt(0).toUpperCase() + data.status.slice(1);
            let statusAr = data.status;
            
            if (data.status === 'paid') {
                statusClass = 'bg-success';
                statusAr = 'مدفوع';
            } else if (data.status === 'unpaid') {
                statusClass = 'bg-danger';
                statusAr = 'غير مدفوع';
            } else if (data.status === 'partially_paid') {
                statusClass = 'bg-warning text-dark';
                statusEn = 'Partially Paid';
                statusAr = 'مدفوع جزئياً';
            }
            
            statusLabel.textContent = statusEn;
            statusLabel.setAttribute('data-en', statusEn);
            statusLabel.setAttribute('data-ar', statusAr);
            statusLabel.className = 'badge text-uppercase ' + statusClass;
            
            const body = document.getElementById('invItemsBody');
            body.innerHTML = '';
            data.items.forEach(item => {
                const tr = document.createElement('tr');
                tr.innerHTML = `
                    <td>${item.name_en} / ${item.name_ar}</td>
                    <td class="text-center">${item.quantity}</td>
                    <td class="text-end">OMR ${parseFloat(item.unit_price).toFixed(3)}</td>
                    <td class="text-end">${parseFloat(item.vat_rate || 0).toFixed(3)}%</td>
                    <td class="text-end">OMR ${parseFloat(item.total_price).toFixed(3)}</td>
                `;
                body.appendChild(tr);
            });
            document.getElementById('invSubtotal').textContent = 'OMR ' + parseFloat(data.total_amount).toFixed(3);
            document.getElementById('invVatAmount').textContent = 'OMR ' + (parseFloat(data.vat_amount) || 0).toFixed(3);
            document.getElementById('invGrandTotal').textContent = 'OMR ' + (parseFloat(data.total_with_vat) || parseFloat(data.total_amount)).toFixed(3);

            // Generate QR Code
            const companyName = "<?= htmlspecialchars($data['settings']['company_name'] ?? 'My Company') ?>";
            const vatNo = "<?= htmlspecialchars($data['settings']['vat_number'] ?? '') ?>";
            const total = (parseFloat(data.total_with_vat) || parseFloat(data.total_amount)).toFixed(3);
            const qrData = `Seller: ${companyName}\nVAT: ${vatNo}\nInvoice: INV-${data.id.toString().padStart(5, '0')}\nDate: ${data.invoice_date}\nTotal: ${total}`;
            const qrUrl = `https://api.qrserver.com/v1/create-qr-code/?size=100x100&data=${encodeURIComponent(qrData)}`;
            document.getElementById('invQrCode').innerHTML = `<img src="${qrUrl}" alt="QR Code" style="width: 100px; height: 100px;" class="border p-1 bg-white">`;
        });
    });
});
</script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
    <script src="assets/js/main.js?v=<?php echo time(); ?>"></script>
</body>
</html>