<?php
require_once 'config.php';

class Products {
    private $conn;

    public function __construct($conn) {
        $this->conn = $conn;
    }

    public function getProducts($filters = [], $page = 1, $limit = 12) {
        $offset = ($page - 1) * $limit;
        $where = [];
        $params = [];
        $types = "";

        if (!empty($filters['category'])) {
            $where[] = "category_id = ?";
            $params[] = $filters['category'];
            $types .= "i";
        }

        if (!empty($filters['search'])) {
            $search = "%" . $filters['search'] . "%";
            $where[] = "(name LIKE ? OR name_ar LIKE ? OR description LIKE ? OR description_ar LIKE ?)";
            $params = array_merge($params, [$search, $search, $search, $search]);
            $types .= "ssss";
        }

        if (!empty($filters['min_price'])) {
            $where[] = "price >= ?";
            $params[] = $filters['min_price'];
            $types .= "d";
        }

        if (!empty($filters['max_price'])) {
            $where[] = "price <= ?";
            $params[] = $filters['max_price'];
            $types .= "d";
        }

        $whereClause = !empty($where) ? "WHERE " . implode(" AND ", $where) : "";
        
        // Get total count
        $countQuery = "SELECT COUNT(*) as total FROM products $whereClause";
        $stmt = $this->conn->prepare($countQuery);
        if (!empty($params)) {
            $stmt->bind_param($types, ...$params);
        }
        $stmt->execute();
        $total = $stmt->get_result()->fetch_assoc()['total'];

        // Get products
        $query = "SELECT p.*, 
                        c.name as category_name, 
                        c.name_ar as category_name_ar,
                        (SELECT image_url FROM product_images WHERE product_id = p.id AND is_primary = 1 LIMIT 1) as primary_image,
                        (SELECT AVG(rating) FROM reviews WHERE product_id = p.id) as average_rating,
                        (SELECT COUNT(*) FROM reviews WHERE product_id = p.id) as review_count
                 FROM products p
                 LEFT JOIN categories c ON p.category_id = c.id
                 $whereClause
                 ORDER BY p.created_at DESC
                 LIMIT ? OFFSET ?";

        $stmt = $this->conn->prepare($query);
        $params[] = $limit;
        $params[] = $offset;
        $types .= "ii";
        $stmt->bind_param($types, ...$params);
        $stmt->execute();
        $result = $stmt->get_result();

        $products = [];
        while ($row = $result->fetch_assoc()) {
            $products[] = $row;
        }

        return [
            'products' => $products,
            'total' => $total,
            'pages' => ceil($total / $limit),
            'current_page' => $page
        ];
    }

    public function getProduct($id) {
        $query = "SELECT p.*, 
                        c.name as category_name, 
                        c.name_ar as category_name_ar,
                        (SELECT AVG(rating) FROM reviews WHERE product_id = p.id) as average_rating,
                        (SELECT COUNT(*) FROM reviews WHERE product_id = p.id) as review_count
                 FROM products p
                 LEFT JOIN categories c ON p.category_id = c.id
                 WHERE p.id = ?";

        $stmt = $this->conn->prepare($query);
        $stmt->bind_param("i", $id);
        $stmt->execute();
        $product = $stmt->get_result()->fetch_assoc();

        if ($product) {
            // Get images
            $stmt = $this->conn->prepare("SELECT * FROM product_images WHERE product_id = ? ORDER BY is_primary DESC, sort_order ASC");
            $stmt->bind_param("i", $id);
            $stmt->execute();
            $result = $stmt->get_result();
            $product['images'] = [];
            while ($row = $result->fetch_assoc()) {
                $product['images'][] = $row;
            }

            // Get reviews
            $stmt = $this->conn->prepare("
                SELECT r.*, u.username, u.full_name 
                FROM reviews r 
                LEFT JOIN users u ON r.user_id = u.id 
                WHERE r.product_id = ? 
                ORDER BY r.created_at DESC
            ");
            $stmt->bind_param("i", $id);
            $stmt->execute();
            $result = $stmt->get_result();
            $product['reviews'] = [];
            while ($row = $result->fetch_assoc()) {
                $product['reviews'][] = $row;
            }

            // Get related products
            $stmt = $this->conn->prepare("
                SELECT p.*, 
                       (SELECT image_url FROM product_images WHERE product_id = p.id AND is_primary = 1 LIMIT 1) as primary_image
                FROM products p 
                WHERE p.category_id = ? AND p.id != ? 
                LIMIT 4
            ");
            $stmt->bind_param("ii", $product['category_id'], $id);
            $stmt->execute();
            $result = $stmt->get_result();
            $product['related_products'] = [];
            while ($row = $result->fetch_assoc()) {
                $product['related_products'][] = $row;
            }
        }

        return $product;
    }

    public function addReview($data) {
        if (!is_logged_in()) {
            return ['success' => false, 'message' => 'يجب تسجيل الدخول لإضافة تقييم'];
        }

        $stmt = $this->conn->prepare("INSERT INTO reviews (product_id, user_id, rating, comment) VALUES (?, ?, ?, ?)");
        $stmt->bind_param("iiis", $data['product_id'], $_SESSION['user_id'], $data['rating'], $data['comment']);
        
        if ($stmt->execute()) {
            return ['success' => true, 'message' => 'تم إضافة التقييم بنجاح'];
        }

        return ['success' => false, 'message' => 'حدث خطأ أثناء إضافة التقييم'];
    }

    public function getCategories() {
        $query = "SELECT * FROM categories ORDER BY parent_id ASC, name ASC";
        $result = $this->conn->query($query);
        $categories = [];
        while ($row = $result->fetch_assoc()) {
            $categories[] = $row;
        }
        return $categories;
    }
}