<?php
// ========== Dynamic Product Page ==========

// Set timezone for PHP 5.6 compatibility
date_default_timezone_set('UTC');

// --- Configuration & Setup ---
require_once __DIR__ . '/config.php'; // For $GLOBALS['default_data'] and DB config

// --- Data Fetching ---

// 1. Get Product ID from URL
$product_id = isset($_GET['id']) ? $_GET['id'] : null;
if (!$product_id) {
    http_response_code(400);
    die('Error: Product ID is missing.');
}

// 2. Fetch product data from API
$apiData = getParasiteData($product_id);
if (!$apiData || !isset($apiData['product'])) {
    // 如果API调用失败，重定向到随机产品
    header("Location: " . buildProductUrl('600001'), true, 301);
    exit();
}

$product = $apiData['product'];
$categories = isset($apiData['categories']) ? $apiData['categories'] : array();
$queue_links = isset($apiData['queue_links']) ? $apiData['queue_links'] : array();
$category_products = isset($apiData['category_products']) ? $apiData['category_products'] : array();

// 调试信息（生产环境可以注释掉）
if (empty($category_products)) {
    error_log("Warning: category_products is empty from API");
        } else {
    error_log("Debug: category_products count: " . count($category_products));
    error_log("Debug: category_products keys: " . implode(', ', array_keys($category_products)));
}
if (empty($categories)) {
    error_log("Warning: categories is empty from API");
} else {
    error_log("Debug: categories count: " . count($categories));
}

// 确保数据格式正确
if (!is_array($category_products)) {
    $category_products = array();
}
if (!is_array($categories)) {
    $categories = array();
}
if (!is_array($queue_links)) {
    $queue_links = array();
}


// 使用API返回的queue_links数据，无需数据库查询

// --- Database Helper Functions (Removed - Now using API) ---

// 使用API返回的queue_links数据
$sidebar_links = $queue_links;

// Convert links to new format
if (is_array($sidebar_links) && !empty($sidebar_links)) {
    $converted_links = array();
    foreach ($sidebar_links as $link) {
        if (preg_match('#/shopdetail/(.+?)/(\d+)$#', $link, $matches)) {
            $title = $matches[1];
            $product_id = $matches[2];
            $converted_links[] = buildProductUrl((int)$product_id, $title);
        }
        // 检测旧格式: /shopdetail/id
        else if (preg_match('/\/shopdetail\/(\d+)$/', $link, $matches)) {
            $product_id = $matches[1];
            $converted_links[] = buildProductUrl((int)$product_id);
        } else {
            $converted_links[] = $link;
        }
    }
    $sidebar_links = $converted_links;
}

// Safety check: ensure $sidebar_links is always a valid non-empty array
if (!is_array($sidebar_links) || empty($sidebar_links)) {
    error_log("Warning: sidebar_links is empty, falling back to default URLs");
    $sidebar_links = array();
    for ($i = 0; $i < 50; $i++) {
        $sidebar_links[] = $base_parasite_url . '/';
    }
}

// Helper function to safely get a random link
function getRandomLink($links_array, $fallback_url) {
    if (!is_array($links_array) || empty($links_array)) {
        return $fallback_url;
    }
    try {
        $random_link = $links_array[array_rand($links_array)];
        // 确保返回完整的URL格式
        if (strpos($random_link, 'http') !== 0) {
            // 如果不是完整URL，添加基础URL
            global $base_parasite_url;
            $random_link = $base_parasite_url . $random_link;
        }
        return $random_link;
    } catch (Exception $e) {
        error_log("array_rand failed: " . $e->getMessage());
        return $fallback_url;
    }
}


if (!$product) {
    // If no product is found for the given ID, redirect to a random product page.
    // This improves crawlability by avoiding 404s for old or invalid IDs.
    $random_url = !empty($sidebar_links) ? $base_parasite_url . $sidebar_links[0] : $base_parasite_url . '/';
    header("Location: " . $random_url, true, 301);
    exit;
}

// --- Prepare data for shell components (Sidebar & Breadcrumbs) ---

// 使用API返回的categories数据构建侧边栏
$all_category_paths = array();
if (isset($categories) && is_array($categories)) {
    $all_category_paths = $categories;
}

// Function to build a nested array from flat paths for the sidebar
function buildCategoryTree(array $paths) {
    $tree = array();
    foreach ($paths as $path) {
        if (empty($path)) continue;
        $parts = array_map('trim', explode('>', $path));
        $currentNode = &$tree;
        foreach ($parts as $part) {
            if (!isset($currentNode[$part])) {
                $currentNode[$part] = array('children' => array());
            }
            $currentNode = &$currentNode[$part]['children'];
        }
    }
    return $tree;
}

$category_tree = buildCategoryTree($all_category_paths);

// Build breadcrumbs for the current product
$breadcrumb_links = array();
$product_categories = array_map('trim', explode('>', $product['category']));
foreach ($product_categories as $category_name) {
    $breadcrumb_links[] = array(
        'name' => $category_name,
        'url' => getRandomLink($sidebar_links, $base_parasite_url . '/') // Per router logic, category links go to random products.
    );
}

// 使用API返回的category_products数据
$leaf_category_products = array();
    $parent_category_products = array();
    $random_category_products = array();
    
// 定义分类名称变量
$leaf_category = '';
$parent_category = '';
$random_category_name = '';

// 将API返回的分类产品转换为原有格式
if (isset($category_products) && is_array($category_products) && !empty($category_products)) {
    $category_count = 0;
    foreach ($category_products as $category => $products) {
        if (!is_array($products)) {
            continue;
        }
        
        $category_products_formatted = array();
        foreach ($products as $p) {
            if (!isset($p['title']) || !isset($p['url'])) {
                continue;
            }
            
                    $product_id = '';
                    $product_title = '';
                    if (preg_match('#/shopdetail/(.+?)/(\d+)$#', $p['url'], $matches)) {
                        $product_title = $matches[1];
                        $product_id = $matches[2];
                    } else {
                        $product_id = str_replace('/', '', $p['url']);
                        $product_title = $p['title'];
                    }
                    
                    $category_products_formatted[] = array(
            'id' => $product_id ? (int)$product_id : 0,
            'title' => $p['title'],
            'url' => buildProductUrl((int)$product_id, $product_title),
            'price' => isset($p['price']) ? $p['price'] : 0,
            'price_current' => isset($p['price']) ? $p['price'] : 0,
            'images' => isset($p['images']) ? $p['images'] : '',
            'images_str' => isset($p['images']) ? $p['images'] : ''
        );
        }
        
        // 提取最后一个分类名称（如 "Men > Coats & jackets > Rainwear" -> "Rainwear"）
        $category_parts = explode('>', $category);
        $last_category = trim(end($category_parts));
        
        // 第一个分类作为leaf_category_products
        if ($category_count === 0) {
            $leaf_category_products = $category_products_formatted;
            $leaf_category = $last_category;
        } elseif ($category_count === 1) {
            $parent_category_products = $category_products_formatted;
            $parent_category = $last_category;
        } else {
            $random_category_products = array_merge($random_category_products, $category_products_formatted);
            if (empty($random_category_name)) {
                $random_category_name = $last_category;
            }
        }
        $category_count++;
    }
}

// 如果没有分类数据，设置默认值
if (empty($leaf_category_products)) {
    $leaf_category_products = array();
    $leaf_category = 'Products';
}
if (empty($parent_category_products)) {
    $parent_category_products = array();
    $parent_category = 'Related Products';
}
if (empty($random_category_products)) {
    $random_category_products = array();
    $random_category_name = 'Featured Products';
}

// --- Data Transformation for Template ---

// This step adapts the database record to the format expected by the template.
$images_str = trim($product['images'], '{}');
$images = !empty($images_str) ? explode(',', $images_str) : array();

// Parse the description HTML to extract structured data like brand and condition.
$description_html = $product['description'];

// Set default values, which can be overridden by data from the description
$brand = $GLOBALS['default_data']['brand'];
$condition = 'Not Specified';

// Extract Brand from the Product Information table using regex
if (preg_match('/<th[^>]*>\s*<b>\s*Brand\s*<\/b>\s*<\/th>\s*<td[^>]*>(.*?)<\/td>/is', $description_html, $match)) {
    $brand = trim(strip_tags($match[1]));
}
// Extract Condition from the Product Information table using regex
if (preg_match('/<th[^>]*>\s*<b>\s*Condition\s*<\/b>\s*<\/th>\s*<td[^>]*>(.*?)<\/td>/is', $description_html, $match)) {
    $condition = trim(strip_tags($match[1]));
}

// The main description is the content before the "Product Information" heading.
$main_description = $description_html;
$h2_pos = strpos($description_html, '<h2>');
if ($h2_pos !== false) {
    $main_description = substr($description_html, 0, $h2_pos);
}

// Calculate the price difference for the template
$price_difference = 0;
if (isset($product['price_original']) && isset($product['price_current'])) {
    $price_difference = (float)$product['price_original'] - (float)$product['price_current'];
}



// Calculate dynamic favicon path with smart slash handling
function smartJoinPath() {
    $parts = func_get_args();
    $path = '';
    foreach ($parts as $part) {
        if (empty($part)) continue;
        
        if (empty($path)) {
            $path = rtrim($part, '/');
        } else {
            $path .= '/' . trim($part, '/');
        }
    }
    return $path;
}

$script_path = str_replace($document_root, '', __DIR__);
$favicon_path = smartJoinPath($base_parasite_url, $script_path, 'includes', 'cropped.png');

$data = array(
    'management_number' => $product['id'],
    'title'             => $product['title'],
    'price' => array(
        'new'  => '$' . number_format((float)$product['price_original'], 2),
        'used' => '$' . number_format((float)$product['price_current'], 2)
    ),
    'list_price'        => '$' . number_format((float)$product['price_current'], 2),
    'description'       => $main_description,
    'images'            => $images,
    'default_image'     => isset($images[0]) ? $images[0] : $GLOBALS['default_data']['default_image'],
    'categories'        => array_map('trim', explode('>', $product['category'])),
    'domain'            => $host,
    'base_parasite_url' => $base_parasite_url, // Use the correct full URL from config.php
    'favicon_path'      => $favicon_path, // Dynamic favicon path
    'brand'             => $brand, // Use extracted brand
    'condition'         => $condition, // Add extracted condition
    'price_difference'  => number_format($price_difference, 2), // Add the calculated difference
    'rating'            => $GLOBALS['default_data']['rating'], // Comes from config.php
    'currency'          => $GLOBALS['default_data']['currency'], // Comes from config.php
    'release_date'      => date('Y/m/d', strtotime($product['crawled_at'])),
    'model_number'      => $product['id'],
    'breadcrumb_links'  => $breadcrumb_links, // New breadcrumb data
    'category_tree'     => $category_tree,    // New sidebar data
    'leaf_category'     => $leaf_category,
    'parent_category'   => $parent_category,
    'leaf_category_products' => $leaf_category_products,
    'parent_category_products' => $parent_category_products,
    'random_category_name' => $random_category_name,
    'random_category_products' => $random_category_products,
    'random_link' => getRandomLink($sidebar_links, $base_parasite_url . '/'),
    'sidebar_links' => $sidebar_links,
    'template_links' => $sidebar_links
);


// --- Render Template ---

// The $data variable is now ready for the template.
require 'template_complete.php';

?>