<?php
require_once __DIR__ . '/../config/database.php';

// Zabezpieczenie przed XSS
function escape($string) {
    return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
}

// Generowanie slug z tytułu
function createSlug($text) {
    $text = mb_strtolower($text, 'UTF-8');
    
    // Polskie znaki
    $replacements = [
        'ą' => 'a', 'ć' => 'c', 'ę' => 'e', 'ł' => 'l',
        'ń' => 'n', 'ó' => 'o', 'ś' => 's', 'ź' => 'z',
        'ż' => 'z', 'Ą' => 'a', 'Ć' => 'c', 'Ę' => 'e',
        'Ł' => 'l', 'Ń' => 'n', 'Ó' => 'o', 'Ś' => 's',
        'Ź' => 'z', 'Ż' => 'z'
    ];
    
    $text = strtr($text, $replacements);
    $text = preg_replace('/[^a-z0-9-]/', '-', $text);
    $text = preg_replace('/-+/', '-', $text);
    $text = trim($text, '-');
    
    return $text;
}

// Pobranie strony po slug
function getPageBySlug($slug) {
    $db = getDB();
    $stmt = $db->prepare("
        SELECT p.*, u.username as author_name 
        FROM pages p 
        LEFT JOIN users u ON p.author_id = u.id 
        WHERE p.slug = ? AND p.status = 'published'
    ");
    $stmt->execute([$slug]);
    return $stmt->fetch();
}

// Pobranie wszystkich stron
function getAllPages($status = 'published', $limit = null) {
    $db = getDB();
    $sql = "SELECT p.*, u.username as author_name 
            FROM pages p 
            LEFT JOIN users u ON p.author_id = u.id 
            WHERE p.status = ? 
            ORDER BY p.created_at DESC";
    
    if ($limit) {
        $sql .= " LIMIT " . intval($limit);
    }
    
    $stmt = $db->prepare($sql);
    $stmt->execute([$status]);
    return $stmt->fetchAll();
}

// Pobranie ustawień
function getSetting($key, $default = '') {
    $db = getDB();
    $stmt = $db->prepare("SELECT setting_value FROM settings WHERE setting_key = ?");
    $stmt->execute([$key]);
    $result = $stmt->fetch();
    return $result ? $result['setting_value'] : $default;
}

// Aktualizacja ustawienia
function updateSetting($key, $value) {
    $db = getDB();
    $stmt = $db->prepare("
        INSERT INTO settings (setting_key, setting_value) 
        VALUES (?, ?) 
        ON DUPLICATE KEY UPDATE setting_value = ?
    ");
    return $stmt->execute([$key, $value, $value]);
}

// Zapisywanie strony
function savePage($data) {
    $db = getDB();
    
    // Jeśli nie ma slug, generuj z tytułu
    if (empty($data['slug'])) {
        $data['slug'] = createSlug($data['title']);
    }
    
    if (isset($data['id']) && $data['id']) {
        // Aktualizacja
        $stmt = $db->prepare("
            UPDATE pages SET 
                title = ?, 
                slug = ?, 
                content = ?, 
                meta_description = ?, 
                meta_keywords = ?, 
                template = ?, 
                status = ?,
                featured_image = ?
            WHERE id = ?
        ");
        
        return $stmt->execute([
            $data['title'],
            $data['slug'],
            $data['content'],
            $data['meta_description'] ?? '',
            $data['meta_keywords'] ?? '',
            $data['template'] ?? 'default',
            $data['status'] ?? 'draft',
            $data['featured_image'] ?? null,
            $data['id']
        ]);
    } else {
        // Nowa strona
        $stmt = $db->prepare("
            INSERT INTO pages (title, slug, content, meta_description, meta_keywords, template, author_id, status, featured_image) 
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
        ");
        
        return $stmt->execute([
            $data['title'],
            $data['slug'],
            $data['content'],
            $data['meta_description'] ?? '',
            $data['meta_keywords'] ?? '',
            $data['template'] ?? 'default',
            $data['author_id'],
            $data['status'] ?? 'draft',
            $data['featured_image'] ?? null
        ]);
    }
}

// Usuwanie strony
function deletePage($id) {
    $db = getDB();
    $stmt = $db->prepare("DELETE FROM pages WHERE id = ?");
    return $stmt->execute([$id]);
}

// Pobranie menu
function getMenu($location) {
    $db = getDB();
    $stmt = $db->prepare("
        SELECT mi.* 
        FROM menu_items mi
        JOIN menus m ON mi.menu_id = m.id
        WHERE m.location = ?
        ORDER BY mi.sort_order ASC
    ");
    $stmt->execute([$location]);
    return $stmt->fetchAll();
}

// Upload pliku
function uploadFile($file, $allowedTypes = ['image/jpeg', 'image/png', 'image/gif']) {
    if (!isset($file['error']) || $file['error'] !== UPLOAD_ERR_OK) {
        return ['success' => false, 'message' => 'Błąd podczas przesyłania pliku'];
    }
    
    if (!in_array($file['type'], $allowedTypes)) {
        return ['success' => false, 'message' => 'Niedozwolony typ pliku'];
    }
    
    if ($file['size'] > MAX_UPLOAD_SIZE) {
        return ['success' => false, 'message' => 'Plik jest za duży'];
    }
    
    $extension = pathinfo($file['name'], PATHINFO_EXTENSION);
    $filename = uniqid() . '.' . $extension;
    $filepath = UPLOAD_DIR . $filename;
    
    if (!is_dir(UPLOAD_DIR)) {
        mkdir(UPLOAD_DIR, 0755, true);
    }
    
    if (move_uploaded_file($file['tmp_name'], $filepath)) {
        // Zapisz do bazy
        $db = getDB();
        $stmt = $db->prepare("
            INSERT INTO media (filename, original_name, file_path, file_type, file_size, mime_type, uploaded_by) 
            VALUES (?, ?, ?, ?, ?, ?, ?)
        ");
        
        $stmt->execute([
            $filename,
            $file['name'],
            $filepath,
            $extension,
            $file['size'],
            $file['type'],
            $_SESSION['user_id'] ?? 1
        ]);
        
        return [
            'success' => true, 
            'filename' => $filename,
            'url' => UPLOAD_URL . $filename,
            'id' => $db->lastInsertId()
        ];
    }
    
    return ['success' => false, 'message' => 'Nie udało się zapisać pliku'];
}

// Logowanie aktywności
function logActivity($action, $entityType = null, $entityId = null) {
    $db = getDB();
    $stmt = $db->prepare("
        INSERT INTO activity_logs (user_id, action, entity_type, entity_id, ip_address, user_agent) 
        VALUES (?, ?, ?, ?, ?, ?)
    ");
    
    return $stmt->execute([
        $_SESSION['user_id'] ?? null,
        $action,
        $entityType,
        $entityId,
        $_SERVER['REMOTE_ADDR'] ?? null,
        $_SERVER['HTTP_USER_AGENT'] ?? null
    ]);
}

// Formatowanie daty
function formatDate($date, $format = 'd.m.Y H:i') {
    return date($format, strtotime($date));
}

// Pobieranie kategorii strony
function getPageCategories($pageId) {
    $db = getDB();
    $stmt = $db->prepare("
        SELECT c.* 
        FROM categories c
        JOIN page_categories pc ON c.id = pc.category_id
        WHERE pc.page_id = ?
    ");
    $stmt->execute([$pageId]);
    return $stmt->fetchAll();
}
?>