<?php

require_once __DIR__ . '/../Models/Product.php';
require_once __DIR__ . '/../Models/Category.php';
require_once __DIR__ . '/../../helpers/slugify.php';

class ProductController {

    public function index() {
        return Product::getAll();
    }

    public function store() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $name = trim($_POST['name'] ?? '');
            $price = trim($_POST['price'] ?? '0');
            $stock = trim($_POST['stock'] ?? '0');

            if (empty($name) || empty($price) || empty($stock)) {
                $_SESSION['error_message'] = 'Name, price and stock are required.';
                return false;
            }

            $slug = slugify($name);
            $image_filename = $this->handleImageUpload();

            $data = [
                'category_id' => $_POST['category_id'],
                'name' => $name,
                'slug' => $slug,
                'description' => $_POST['description'] ?? '',
                'price' => $price,
                'stock' => $stock,
                'active' => isset($_POST['active']) ? 1 : 0,
                'image' => $image_filename
            ];

            if (Product::create($data)) {
                $_SESSION['success_message'] = 'Product created successfully.';
                return true;
            } else {
                $_SESSION['error_message'] = 'Failed to create product.';
                return false;
            }
        }
        return false;
    }

    public function update() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $id = $_POST['id'];
            $name = trim($_POST['name'] ?? '');
            $price = trim($_POST['price'] ?? '0');
            $stock = trim($_POST['stock'] ?? '0');

            if (empty($name) || empty($price) || empty($stock)) {
                $_SESSION['error_message'] = 'Name, price and stock are required.';
                return false;
            }

            $product = Product::find($id);
            if (!$product) {
                $_SESSION['error_message'] = 'Product not found.';
                return false;
            }

            $slug = slugify($name);
            $image_filename = $this->handleImageUpload($product['image']);

            $data = [
                'category_id' => $_POST['category_id'],
                'name' => $name,
                'slug' => $slug,
                'description' => $_POST['description'] ?? '',
                'price' => $price,
                'stock' => $stock,
                'active' => isset($_POST['active']) ? 1 : 0,
                'image' => $image_filename
            ];

            if (Product::update($id, $data)) {
                $_SESSION['success_message'] = 'Product updated successfully.';
                return true;
            } else {
                $_SESSION['error_message'] = 'Failed to update product.';
                return false;
            }
        }
        return false;
    }

    public function destroy() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $id = $_POST['delete_id'];
            $image = Product::getProductImage($id);

            if (Product::delete($id)) {
                if ($image) {
                    $this->deleteImage($image);
                }
                $_SESSION['success_message'] = 'Product deleted successfully.';
                return true;
            } else {
                $_SESSION['error_message'] = 'Failed to delete product.';
                return false;
            }
        }
        return false;
    }

    private function handleImageUpload($existing_image = null) {
        if (isset($_FILES['image']) && $_FILES['image']['error'] === UPLOAD_ERR_OK) {
            $upload_dir = __DIR__ . '/../../public_html/uploads/products/';
            if (!is_dir($upload_dir)) {
                mkdir($upload_dir, 0777, true);
            }

            $tmp_name = $_FILES['image']['tmp_name'];
            $original_name = basename($_FILES['image']['name']);
            $file_extension = pathinfo($original_name, PATHINFO_EXTENSION);
            $safe_filename = uniqid('product_', true) . '.' . $file_extension;
            $destination = $upload_dir . $safe_filename;

            if (move_uploaded_file($tmp_name, $destination)) {
                // Delete old image if a new one is uploaded
                if ($existing_image) {
                    $this->deleteImage($existing_image);
                }
                return $safe_filename;
            }
        }
        return $existing_image; // Return old image if no new one was uploaded
    }

    private function deleteImage($filename) {
        $file_path = __DIR__ . '/../../public_html/uploads/products/' . $filename;
        if (file_exists($file_path)) {
            unlink($file_path);
        }
    }

    public function getCategories() {
        return Category::getAll();
    }

    public function show($slug) {
        return Product::findBySlug($slug);
    }

    public function search($term) {
        return Product::search($term);
    }
}