const escapeHtml = (value) => {
        const stringValue = value == null ? '' : String(value);
        return stringValue.replace(/[&<>"']/g, (character) => ({
            '&': '&amp;',
            '<': '&lt;',
            '>': '&gt;',
            '"': '&quot;',
            "'": '&#039;'
        }[character] || character));
    };

    const humanizeInvoiceText = (value) => {
        const raw = String(value ?? '').trim();
        if (!raw) {
            return '---';
        }

        return raw
            .replace(/[_-]+/g, ' ')
            .replace(/\s+/g, ' ')
            .toLowerCase()
            .replace(/\b\w/g, (letter) => letter.toUpperCase());
    };

    const formatInvoiceCurrency = (amount, decimals = 3) => {
        const numericAmount = Number.isFinite(parseFloat(amount)) ? parseFloat(amount) : 0;
        return `<span class="invoice-currency"><?= __('currency') ?></span>${numericAmount.toFixed(decimals)}`;
    };

    const setInvoiceText = (id, value) => {
        const element = document.getElementById(id);
        if (element) {
            element.textContent = value == null || value === '' ? '---' : String(value);
        }
        return element;
    };

    const toggleInvoiceField = (containerId, valueId, value) => {
        const container = document.getElementById(containerId);
        const valueElement = document.getElementById(valueId);
        if (!container || !valueElement) {
            return;
        }

        if (value) {
            valueElement.textContent = value;
            container.style.display = '';
        } else {
            valueElement.textContent = '';
            container.style.display = 'none';
        }
    };

    let invoicePrintOriginalParent = null;
    let invoicePrintOriginalNextSibling = null;
    let invoicePrintRestoreTimer = null;

    const prepareInvoiceForPrint = () => {
        const modal = document.getElementById('viewInvoiceModal');
        if (!modal || !document.body) {
            return;
        }

        if (!invoicePrintOriginalParent) {
            invoicePrintOriginalParent = modal.parentNode;
            invoicePrintOriginalNextSibling = modal.nextSibling;
        }

        if (modal.parentNode !== document.body) {
            document.body.appendChild(modal);
        }

        document.body.classList.add('printing-invoice');
    };

    const restoreInvoiceAfterPrint = () => {
        const modal = document.getElementById('viewInvoiceModal');
        if (!document.body) {
            return;
        }

        document.body.classList.remove('printing-invoice');

        if (!modal || !invoicePrintOriginalParent || modal.parentNode === invoicePrintOriginalParent) {
            return;
        }

        invoicePrintOriginalParent.insertBefore(modal, invoicePrintOriginalNextSibling);
    };

    window.printInvoiceDocument = function() {
        prepareInvoiceForPrint();
        window.print();

        if (invoicePrintRestoreTimer) {
            window.clearTimeout(invoicePrintRestoreTimer);
        }

        invoicePrintRestoreTimer = window.setTimeout(() => {
            restoreInvoiceAfterPrint();
        }, 1200);
    };

    window.addEventListener('beforeprint', prepareInvoiceForPrint);
    window.addEventListener('afterprint', restoreInvoiceAfterPrint);

    window.viewAndPrintA4Invoice = function(data, autoPrint = true) {
        if (!data) return;

        const invoiceType = String(data.type || 'sale').toLowerCase() === 'purchase' ? 'purchase' : 'sale';
        const invoiceDisplayNo = data.document_no || data.transaction_no || ((invoiceType === 'purchase' ? 'PUR-' : 'INV-') + data.id.toString().padStart(5, '0'));
        const paymentText = humanizeInvoiceText(data.payment_type || 'cash');
        const statusKey = String(data.status || '').toLowerCase();
        const statusText = statusKey === 'partially_paid' ? 'Partially Paid' : humanizeInvoiceText(statusKey);
        const typeText = invoiceType === 'purchase' ? 'Purchase Invoice' : 'Sales Invoice';
        const documentTitle = invoiceType === 'purchase' ? 'Purchase Invoice / فاتورة شراء' : 'Tax Invoice / فاتورة ضريبية';
        const documentSubtitle = invoiceType === 'purchase' ? 'Official purchase record / مستند شراء رسمي' : 'Official tax document / مستند ضريبي رسمي';
        const partyLabelText = invoiceType === 'purchase' ? 'Supplier Details / بيانات المورد' : 'Bill To / بيانات العميل';
        const partyLabelEn = invoiceType === 'purchase' ? 'Supplier Details' : 'Bill To';
        const partyLabelAr = invoiceType === 'purchase' ? 'بيانات المورد' : 'بيانات العميل';
        const formatQty = typeof window.formatQuantity === 'function'
            ? window.formatQuantity
            : (value) => {
                const numericValue = Number.isFinite(parseFloat(value)) ? parseFloat(value) : 0;
                return Number.isInteger(numericValue)
                    ? String(numericValue)
                    : numericValue.toFixed(3).replace(/\.?0+$/, '');
            };

        setInvoiceText('invNumber', invoiceDisplayNo);
        setInvoiceText('invDate', data.invoice_date || '---');
        setInvoiceText('invPaymentType', paymentText);
        setInvoiceText('invPaymentTypeSummary', paymentText);
        setInvoiceText('invCustomerName', data.customer_name || '---');
        setInvoiceText('invStatusText', statusText);
        setInvoiceText('invDocumentTitle', documentTitle);
        setInvoiceText('invDocumentSubtitle', documentSubtitle);
        setInvoiceText('invAmountInWords', data.total_in_words || '---');

        toggleInvoiceField('invCustomerPhoneContainer', 'invCustomerPhone', data.customer_phone || '');
        toggleInvoiceField('invCustomerTaxIdContainer', 'invCustomerTaxId', data.customer_tax_id || '');
        toggleInvoiceField('invOutletRow', 'invOutletName', data.outlet_name || '');

        const partyLabel = document.getElementById('invPartyLabel');
        if (partyLabel) {
            partyLabel.textContent = partyLabelText;
            partyLabel.setAttribute('data-en', partyLabelEn);
            partyLabel.setAttribute('data-ar', partyLabelAr);
        }

        const invoiceTypeLabel = document.getElementById('invoiceTypeLabel');
        if (invoiceTypeLabel) {
            invoiceTypeLabel.textContent = typeText;
            invoiceTypeLabel.className = 'invoice-pill ' + (invoiceType === 'purchase' ? 'invoice-pill--purchase' : 'invoice-pill--sale');
        }

        const statusLabel = document.getElementById('invoiceStatusLabel');
        let statusClass = 'invoice-pill--neutral';
        if (statusKey === 'paid') {
            statusClass = 'invoice-pill--paid';
        } else if (statusKey === 'unpaid') {
            statusClass = 'invoice-pill--unpaid';
        } else if (statusKey === 'partially_paid') {
            statusClass = 'invoice-pill--partial';
        }
        if (statusLabel) {
            statusLabel.textContent = statusText;
            statusLabel.className = 'invoice-pill ' + statusClass;
        }

        const body = document.getElementById('invItemsBody');
        if (body) {
            body.innerHTML = '';
            if (Array.isArray(data.items) && data.items.length > 0) {
                data.items.forEach((item, index) => {
                    const tr = document.createElement('tr');
                    const englishName = escapeHtml(item.name_en || item.name || 'Item');
                    const arabicName = escapeHtml(item.name_ar || '');
                    const vatRateText = `${(Number.isFinite(parseFloat(item.vat_rate)) ? parseFloat(item.vat_rate) : 0).toFixed(2)}%`;
                    const itemDetails = [];
                    if (arabicName) {
                        itemDetails.push(arabicName);
                    }
                    itemDetails.push(`VAT ${vatRateText}`);
                    const itemNameHtml = `
                        <div class="invoice-item-name">${englishName}</div>
                        <div class="invoice-item-secondary">${itemDetails.join(' • ')}</div>
                    `;

                    tr.innerHTML = `
                        <td class="text-center invoice-line-no">${index + 1}</td>
                        <td>${itemNameHtml}</td>
                        <td class="text-center">${formatQty(item.quantity)}</td>
                        <td class="text-end invoice-amount">${formatInvoiceCurrency(item.unit_price, 3)}</td>
                        <td class="text-end invoice-amount">${formatInvoiceCurrency(item.total_price, 3)}</td>
                    `;
                    body.appendChild(tr);
                });
            } else {
                body.innerHTML = '<tr><td colspan="5" class="text-center text-muted py-4">No invoice items / لا توجد أصناف</td></tr>';
            }
        }

        const vatVal = Number.isFinite(parseFloat(data.vat_amount)) ? parseFloat(data.vat_amount) : 0;
        const totalVal = Number.isFinite(parseFloat(data.total_amount)) ? parseFloat(data.total_amount) : 0;
        const discountVal = Math.max(0, Number.isFinite(parseFloat(data.discount_amount)) ? parseFloat(data.discount_amount) : 0);
        const isPosInvoice = String(data.is_pos || '0') === '1';
        const grossBeforeDiscount = isPosInvoice ? totalVal : (totalVal + vatVal);
        const grandTotalParsed = parseFloat(data.total_with_vat);
        const grandTotalValue = Number.isFinite(grandTotalParsed) ? grandTotalParsed : Math.max(0, grossBeforeDiscount - discountVal);
        const subtotalExVat = isPosInvoice ? Math.max(0, grossBeforeDiscount - vatVal) : totalVal;
        const paidAmount = Number.isFinite(parseFloat(data.paid_amount)) ? parseFloat(data.paid_amount) : 0;
        const balance = Math.max(0, grandTotalValue - paidAmount);

        const subtotalEl = document.getElementById('invSubtotal');
        if (subtotalEl) subtotalEl.innerHTML = formatInvoiceCurrency(subtotalExVat, 3);

        const vatEl = document.getElementById('invVatAmount');
        if (vatEl) vatEl.innerHTML = formatInvoiceCurrency(vatVal, 3);

        const discountRow = document.getElementById('invDiscountRow');
        const discountAmountEl = document.getElementById('invDiscountAmount');
        if (discountRow && discountAmountEl) {
            if (discountVal > 0) {
                discountRow.style.display = 'flex';
                discountAmountEl.innerHTML = formatInvoiceCurrency(discountVal, 3);
            } else {
                discountRow.style.display = 'none';
                discountAmountEl.innerHTML = '';
            }
        }

        const grandTotalEl = document.getElementById('invGrandTotal');
        if (grandTotalEl) grandTotalEl.innerHTML = formatInvoiceCurrency(grandTotalValue, 3);

        const paidInfoEl = document.getElementById('invPaidInfo');
        if (paidInfoEl) paidInfoEl.innerHTML = formatInvoiceCurrency(paidAmount, 3);

        const balanceInfoEl = document.getElementById('invBalanceInfo');
        if (balanceInfoEl) balanceInfoEl.innerHTML = formatInvoiceCurrency(balance, 3);

        const companyName = <?= json_encode($data['settings']['company_name'] ?? 'Accounting System') ?>;
        const vatNo = <?= json_encode($data['settings']['vat_number'] ?? '') ?>;
        const qrData = `Seller: ${companyName}\nVAT: ${vatNo}\nInvoice: ${invoiceDisplayNo}\nDate: ${data.invoice_date}\nTotal: ${grandTotalValue.toFixed(3)}`;
        const qrUrl = `https://api.qrserver.com/v1/create-qr-code/?size=112x112&data=${encodeURIComponent(qrData)}`;
        const qrCode = document.getElementById('invQrCode');
        if (qrCode) {
            qrCode.innerHTML = `<img src="${qrUrl}" alt="QR Code" width="112" height="112" class="bg-white rounded" style="width: 112px; height: 112px;">`;
        }

        const viewModal = bootstrap.Modal.getOrCreateInstance(document.getElementById('viewInvoiceModal'));
        viewModal.show();

        const paymentsPromise = fetch(`index.php?action=get_payments&invoice_id=${data.id}`)
            .then((res) => res.json())
            .then((payments) => {
                const paymentsBody = document.getElementById('invPaymentsBody');
                const paymentsSection = document.getElementById('invPaymentsSection');
                if (paymentsBody) paymentsBody.innerHTML = '';

                if (Array.isArray(payments) && payments.length > 0) {
                    if (paymentsBody) {
                        payments.slice(0, 3).forEach((payment) => {
                            const paymentChip = document.createElement('div');
                            paymentChip.className = 'invoice-payment-pill';
                            paymentChip.innerHTML = `
                                <span>${escapeHtml(payment.payment_date || '')}</span>
                                <span class="invoice-payment-sep">•</span>
                                <span>${escapeHtml(humanizeInvoiceText(payment.payment_method || ''))}</span>
                                <span class="invoice-payment-sep">•</span>
                                <strong>${formatInvoiceCurrency(payment.amount, 3)}</strong>
                            `;
                            paymentsBody.appendChild(paymentChip);
                        });

                        if (payments.length > 3) {
                            const moreChip = document.createElement('div');
                            moreChip.className = 'invoice-payment-pill invoice-payment-pill--more';
                            moreChip.textContent = `+${payments.length - 3} more payments`;
                            paymentsBody.appendChild(moreChip);
                        }
                    }
                    if (paymentsSection) paymentsSection.style.display = 'block';
                } else if (paymentsSection) {
                    paymentsSection.style.display = 'none';
                }
            })
            .catch((err) => {
                console.error('Error fetching payments:', err);
                const paymentsSection = document.getElementById('invPaymentsSection');
                if (paymentsSection) paymentsSection.style.display = 'none';
            });

        if (autoPrint) {
            paymentsPromise.finally(() => {
                setTimeout(() => {
                    window.printInvoiceDocument();
                }, 450);
            });
        }
    };

    <?php
    $autoInvoicePayload = null;
    if (
        isset($_SESSION['trigger_invoice_modal'], $_SESSION['show_invoice_id'], $_SESSION['show_invoice_page']) &&
        in_array($page, ['sales', 'purchases'], true) &&
        $_SESSION['show_invoice_page'] === $page
    ) {
        $autoInvoiceId = (int)$_SESSION['show_invoice_id'];
        $autoInvoiceType = $page === 'purchases' ? 'purchase' : 'sale';
        unset($_SESSION['trigger_invoice_modal'], $_SESSION['show_invoice_id'], $_SESSION['show_invoice_page']);

        try {
            $autoTable = $autoInvoiceType === 'purchase' ? 'purchases' : 'invoices';
            $autoPartyTable = $autoInvoiceType === 'purchase' ? 'suppliers' : 'customers';
            $autoPartyCol = $autoInvoiceType === 'purchase' ? 'supplier_id' : 'customer_id';
            $autoTaxColumn = entity_tax_column($autoPartyTable);
            $autoTaxSelect = $autoTaxColumn !== null ? "c.$autoTaxColumn AS customer_tax_id" : "'' AS customer_tax_id";
            $autoOutletSelect = "'' AS outlet_name";
            $autoOutletJoin = '';

            if (db_column_exists($autoTable, 'outlet_id') && db_table_exists('outlets')) {
                $autoOutletSelect = 'o.name AS outlet_name';
                $autoOutletJoin = 'LEFT JOIN outlets o ON doc.outlet_id = o.id';
            }

            $autoStmt = db()->prepare("SELECT doc.*, c.name AS customer_name, c.phone AS customer_phone, $autoTaxSelect, $autoOutletSelect
                                       FROM $autoTable doc
                                       LEFT JOIN $autoPartyTable c ON doc.$autoPartyCol = c.id
                                       $autoOutletJoin
                                       WHERE doc.id = ?
                                       LIMIT 1");
            $autoStmt->execute([$autoInvoiceId]);
            $autoInvoicePayload = $autoStmt->fetch(PDO::FETCH_ASSOC);

            if ($autoInvoicePayload) {
                $autoItemSql = $autoInvoiceType === 'purchase'
                    ? "SELECT pi.*, i.name_en, i.name_ar, i.vat_rate FROM purchase_items pi LEFT JOIN stock_items i ON pi.item_id = i.id WHERE pi.purchase_id = ?"
                    : "SELECT ii.*, i.name_en, i.name_ar, i.vat_rate FROM invoice_items ii LEFT JOIN stock_items i ON ii.item_id = i.id WHERE ii.invoice_id = ?";
                $autoItemsStmt = db()->prepare($autoItemSql);
                $autoItemsStmt->execute([$autoInvoiceId]);
                $autoInvoicePayload['items'] = $autoItemsStmt->fetchAll(PDO::FETCH_ASSOC);
                $autoInvoicePayload['type'] = $autoInvoiceType;
                $autoInvoicePayload['total_with_vat'] = (float)($autoInvoicePayload['total_with_vat'] ?? (($autoInvoicePayload['total_amount'] ?? 0) + ($autoInvoicePayload['vat_amount'] ?? 0)));
                $autoInvoicePayload['paid_amount'] = (float)($autoInvoicePayload['paid_amount'] ?? 0);
                $autoInvoicePayload['total_in_words'] = numberToWordsOMR($autoInvoicePayload['total_with_vat']);
                $autoTransactionNo = trim((string)($autoInvoicePayload['transaction_no'] ?? ''));
                $autoPrefix = $autoInvoiceType === 'purchase' ? 'PUR' : 'INV';
                $autoInvoicePayload['document_no'] = ($autoInvoiceType === 'sale' && $autoTransactionNo !== '')
                    ? $autoTransactionNo
                    : $autoPrefix . '-' . str_pad((string)$autoInvoicePayload['id'], 5, '0', STR_PAD_LEFT);
            }
        } catch (Throwable $e) {
            $autoInvoicePayload = null;
        }
    }
    ?>
    <?php if (!empty($autoInvoicePayload)): ?>
    setTimeout(() => {
        if (window.viewAndPrintA4Invoice) {
            window.viewAndPrintA4Invoice(<?= json_encode($autoInvoicePayload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?>, true);
        }
    }, 300);
    <?php endif; ?>