<?php
// Αρχείο: /var/www/html/hockey-cms/index.php

if (session_status() === PHP_SESSION_NONE) { session_start(); }

require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/config/database.php';

// --- Μηχανισμός Αλλαγής Γλώσσας (Language Switcher) ---
if (isset($_GET['lang']) && in_array($_GET['lang'], ['el', 'en'])) {
    $_SESSION['lang'] =$_GET['lang'];
}
$current_lang =$_SESSION['lang'] ?? 'el';

// --- Εντοπισμός Ενεργού Theme ---
$active_theme = 'default';
try {
    $stmt =$pdo->query("SELECT value FROM settings WHERE `key` = 'active_theme'");
    $res =$stmt->fetchColumn();
    if ($res) { $active_theme =$res; }
} catch (Exception $e) {}

$theme_dir = __DIR__ . '/themes/' .$active_theme;
if (!is_dir($theme_dir)) {
    $active_theme = 'default';$theme_dir = __DIR__ . '/themes/default';
}

// --- Αρχικοποίηση Twig ---
$loader = new \Twig\Loader\FilesystemLoader($theme_dir);
$twig = new \Twig\Environment($loader, ['cache' => false]);

$twig->addGlobal('session',$_SESSION);
$twig->addGlobal('current_lang',$current_lang);

// --- Φόρτωση Δυναμικών Κειμένων Site ---
$siteTexts = [];
try {
    $text_column = ($current_lang === 'en') ? 'text_value_en' : 'text_value_el';
    $textsStmt =$pdo->query("SELECT text_key, {$text_column} as text_value FROM site_texts");
    
    while ($row = $textsStmt->fetch(PDO::FETCH_ASSOC)) {$siteTexts[$row['text_key']] =$row['text_value'];
    }
} catch (Exception $e) {}
$twig->addGlobal('text',$siteTexts);

// --- Φόρτωση Logo Site ---
$site_logo = '';
try {
    $logoStmt =$pdo->prepare("SELECT value FROM settings WHERE `key` = 'site_logo'");
    $logoStmt->execute();
    $site_logo =$logoStmt->fetchColumn();
} catch (Exception $e) {}
$twig->addGlobal('site_logo',$site_logo);

try {
    // --- Φόρτωση Κατηγοριών ---
    $categoriesRaw =$pdo->query("SELECT * FROM categories ORDER BY sort_order ASC, name_el ASC")->fetchAll(PDO::FETCH_ASSOC);
    
    $categories = [];
    foreach ($categoriesRaw as $cat) {$cat['display_name'] = ($current_lang === 'en' && !empty($cat['name_en'])) ? $cat['name_en'] :$cat['name_el'];
        $categories[] =$cat;
    }
    
    // --- Λήψη Παραμέτρων Φίλτρων & ΣΕΛΙΔΟΠΟΙΗΣΗΣ ---
    $category_id = isset($_GET['category_id']) ? (int)$_GET['category_id'] : 0;
    $sort = isset($_GET['sort']) ?$_GET['sort'] : 'newest';
    $min_price = (isset($_GET['min_price']) && is_numeric($_GET['min_price'])) ? (float)$_GET['min_price'] : null;
    $max_price = (isset($_GET['max_price']) && is_numeric($_GET['max_price'])) ? (float)$_GET['max_price'] : null;
    $search_query = isset($_GET['q']) ? trim($_GET['q']) : '';

    // Παράμετροι Σελιδοποίησης
    $limit = isset($_GET['limit']) ? (int)$_GET['limit'] : 30;
    if (!in_array($limit, [30, 50, 100])) { $limit = 30; } // Default & Safety$page = isset($_GET['page']) ? (int)$_GET['page'] : 1;
    if ($page < 1) {$page = 1; }

    $current_category_name = null;
    $category_attributes = [];

    // --- ΔΙΑΣΠΑΣΗ ΤΟΥ SQL QUERY (Για να μετράμε και το σύνολο) ---
    $sql_select = "SELECT p.id, p.sku, p.title, p.price, p.created_at, pi.image_path";
    $sql_from = " FROM products p LEFT JOIN product_images pi ON (p.id = pi.product_id AND pi.is_primary = 1)";
    $sql_where = " WHERE p.status = 'available'";
    $params = [];

    // 1. Φίλτρο Κατηγορίας
    if ($category_id > 0) {
        $catStmt =$pdo->prepare("SELECT name_el, name_en, attribute_group_id FROM categories WHERE id = ?");
        $catStmt->execute([$category_id]);
        $catData =$catStmt->fetch(PDO::FETCH_ASSOC);
        
        if ($catData) {
            $current_category_name = ($current_lang === 'en' && !empty($catData['name_en'])) ?$catData['name_en'] : $catData['name_el'];$sql_where .= " AND (p.category_id = ? OR p.category_id IN (SELECT id FROM categories WHERE parent_id = ?))";
            $params[] =$category_id;
            $params[] =$category_id;

            if ($catData['attribute_group_id']) {
                $attrStmt =$pdo->prepare("
                    SELECT a.id, a.name as name_el, a.name_en, a.unit, 
                           (SELECT GROUP_CONCAT(DISTINCT value SEPARATOR '||') FROM product_attribute_values WHERE attribute_id = a.id) as distinct_values
                    FROM attributes a 
                    WHERE a.group_id = ?
                ");
                $attrStmt->execute([$catData['attribute_group_id']]);
                $catAttrsRaw =$attrStmt->fetchAll(PDO::FETCH_ASSOC);
                
                foreach ($catAttrsRaw as $a) {$a['display_name'] = ($current_lang === 'en' && !empty($a['name_en'])) ? $a['name_en'] :$a['name_el'];
                    $category_attributes[] =$a;
                }
            }
        }
    }

    // 2. Έξυπνο Φίλτρο Αναζήτησης (Βελτιωμένο)
    if ($search_query !== '') {
        $clean_query = preg_replace('/[^\p{L}\p{N}\s\-]/u', ' ',$search_query);
        $words = preg_split('/\s+/', mb_strtolower($clean_query, 'UTF-8'));
        $words = array_filter($words, function($w) { return mb_strlen(trim($w)) > 1; });

        if (!empty($words)) {$whereClauses = [];
            foreach ($words as $word) {$whereClauses[] = "(LOWER(COALESCE(p.sku, '')) LIKE CONCAT('%', ?, '%') OR LOWER(COALESCE(p.title, '')) LIKE CONCAT('%', ?, '%') OR LOWER(COALESCE(p.description, '')) LIKE CONCAT('%', ?, '%') OR LOWER(COALESCE(p.search_tags, '')) LIKE CONCAT('%', ?, '%'))";
                array_push($params, $word,$word, $word,$word);
            }
            $sql_where .= " AND (" . implode(" AND ", $whereClauses) . ")";
        }
    }

    // 3. Φίλτρο Τιμής
    if ($min_price !== null) {$sql_where .= " AND p.price >= ?"; $params[] =$min_price; }
    if ($max_price !== null) {$sql_where .= " AND p.price <= ?"; $params[] =$max_price; }

    // 4. Φίλτρο Δυναμικών Χαρακτηριστικών
    if (isset($_GET['attr']) && is_array($_GET['attr'])) {
        foreach ($_GET['attr'] as $attr_id =>$attr_val) {
            if (!empty($attr_val)) {$sql_where .= " AND EXISTS (SELECT 1 FROM product_attribute_values pav WHERE pav.product_id = p.id AND pav.attribute_id = ? AND pav.value = ?)";
                $params[] = (int)$attr_id;
                $params[] =$attr_val;
            }
        }
    }

    // --- ΜΕΤΡΗΣΗ ΣΥΝΟΛΙΚΩΝ ΠΡΟΪΟΝΤΩΝ ΓΙΑ ΣΕΛΙΔΟΠΟΙΗΣΗ ---
    $countSql = "SELECT COUNT(p.id)" . $sql_from .$sql_where;
    $stmtCount = $pdo->prepare($countSql);
    $stmtCount->execute($params);
    $total_products = (int)$stmtCount->fetchColumn();

    $total_pages = ceil($total_products / $limit);
    if ($page >$total_pages && $total_pages > 0) {$page = $total_pages; }$offset = ($page - 1) *$limit;

    // --- ΤΕΛΙΚΟ QUERY ΠΡΟΪΟΝΤΩΝ ΜΕ ΟΡΙΑ ---
    $sql =$sql_select . $sql_from .$sql_where;

    // 5. Ταξινόμηση
    if ($sort === 'price_asc') {$sql .= " ORDER BY p.price ASC"; }
    elseif ($sort === 'price_desc') {$sql .= " ORDER BY p.price DESC"; }
    else { $sql .= " ORDER BY p.id DESC"; }

    // 6. Προσθήκη Ορίων (Pagination)
    $sql .= " LIMIT " . $limit . " OFFSET " . $offset;

    // Εκτέλεση
    $stmt = $pdo->prepare($sql);
    $stmt->execute($params);
    $products =$stmt->fetchAll(PDO::FETCH_ASSOC);

    // --- ΕΝΣΩΜΑΤΩΣΗ ΧΑΡΑΚΤΗΡΙΣΤΙΚΩΝ ΣΤΑ ΠΡΟΪΟΝΤΑ ---
    if (!empty($products)) {
        $product_ids = array_column($products, 'id');
        $inQuery = implode(',', array_fill(0, count($product_ids), '?'));
        
        $attrValsStmt =$pdo->prepare("
            SELECT pav.product_id, a.name as name_el, a.name_en, a.unit, pav.value 
            FROM product_attribute_values pav
            JOIN attributes a ON pav.attribute_id = a.id
            WHERE pav.product_id IN ($inQuery)
        ");
        $attrValsStmt->execute($product_ids);
        $all_attrs =$attrValsStmt->fetchAll(PDO::FETCH_ASSOC);

        $attrs_by_pid = [];
        foreach ($all_attrs as $attr) {$attr_name = ($current_lang === 'en' && !empty($attr['name_en'])) ? $attr['name_en'] :$attr['name_el'];
            $attrs_by_pid[$attr['product_id']][] = [
                'name' => $attr_name,
                'value' => $attr['value'],
                'unit' => $attr['unit']
            ];
        }

        foreach ($products as &$prod) {$prod['attributes'] = $attrs_by_pid[$prod['id']] ?? [];
        }
        unset($prod);
    }

    // --- ΔΗΜΙΟΥΡΓΙΑ BASE URL ΓΙΑ ΤΑ ΚΟΥΜΠΙΑ ΣΕΛΙΔΟΠΟΙΗΣΗΣ ---
    $qs =$_GET;
    unset($qs['page']); // Αφαιρούμε το page για να το βάλει δυναμικά το Twig
    $base_qs = http_build_query($qs);$pagination_url = 'index.php?' . ($base_qs ? $base_qs . '&' : '') . 'page=';

} catch (Exception $e) {
    die("Σφάλμα ανάγνωσης δεδομένων: " . $e->getMessage());
}

echo $twig->render('index.html.twig', [
    'site_title' => 'Hockey Gear CMS',
    'categories' => $categories,
    'products' => $products,
    'current_category_name' => $current_category_name,
    'category_id' => $category_id,
    'category_attributes' => $category_attributes,
    'search_query' => $search_query,
    'filters' => $_GET,
    // Νέες μεταβλητές Σελιδοποίησης
    'current_page' => $page,
    'total_pages' => $total_pages,
    'limit' => $limit,
    'total_products' => $total_products,
    'pagination_url' => $pagination_url
]);