<?php
/**
 * Copyright seit 2024 Webshop System
 *
 * Override-System für PrestaShop-Modul-Kompatibilität
 *
 * @author    Webshop System
 * @license   GPL v3
 */

namespace App\Core;

use Doctrine\DBAL\DriverManager;
use Doctrine\DBAL\Exception;

class Override
{
    private static $overrides = [];
    private static $initialized = false;
    
    /**
     * Override-System initialisieren
     */
    public static function init()
    {
        if (self::$initialized) {
            return;
        }
        
        self::loadOverridesFromDatabase();
        self::$initialized = true;
    }
    
    /**
     * Class-Override registrieren
     */
    public static function registerClassOverride($originalClass, $overridePath, $moduleName)
    {
        $overrideKey = 'class_' . $originalClass;
        
        self::$overrides[$overrideKey] = [
            'type' => 'class',
            'original' => $originalClass,
            'path' => $overridePath,
            'module' => $moduleName,
            'active' => true
        ];
        
        // Override in Datenbank speichern
        self::saveOverrideToDatabase($overrideKey, 'class', $originalClass, $overridePath, $moduleName);
    }
    
    /**
     * Template-Override registrieren
     */
    public static function registerTemplateOverride($originalTemplate, $overridePath, $moduleName)
    {
        $overrideKey = 'template_' . $originalTemplate;
        
        self::$overrides[$overrideKey] = [
            'type' => 'template',
            'original' => $originalTemplate,
            'path' => $overridePath,
            'module' => $moduleName,
            'active' => true
        ];
        
        // Override in Datenbank speichern
        self::saveOverrideToDatabase($overrideKey, 'template', $originalTemplate, $overridePath, $moduleName);
    }
    
    /**
     * Controller-Override registrieren
     */
    public static function registerControllerOverride($originalController, $overridePath, $moduleName)
    {
        $overrideKey = 'controller_' . $originalController;
        
        self::$overrides[$overrideKey] = [
            'type' => 'controller',
            'original' => $originalController,
            'path' => $overridePath,
            'module' => $moduleName,
            'active' => true
        ];
        
        // Override in Datenbank speichern
        self::saveOverrideToDatabase($overrideKey, 'controller', $originalController, $overridePath, $moduleName);
    }
    
    /**
     * Class-Override laden
     */
    public static function loadClass($className)
    {
        self::init();
        
        $overrideKey = 'class_' . $className;
        
        if (isset(self::$overrides[$overrideKey]) && self::$overrides[$overrideKey]['active']) {
            $overridePath = self::$overrides[$overrideKey]['path'];
            
            if (file_exists($overridePath)) {
                require_once $overridePath;
                
                // Prüfen ob die Override-Klasse existiert
                if (class_exists($className)) {
                    return true;
                }
            }
        }
        
        return false;
    }
    
    /**
     * Template-Override laden
     */
    public static function loadTemplate($templatePath)
    {
        self::init();
        
        $overrideKey = 'template_' . $templatePath;
        
        if (isset(self::$overrides[$overrideKey]) && self::$overrides[$overrideKey]['active']) {
            $overridePath = self::$overrides[$overrideKey]['path'];
            
            if (file_exists($overridePath)) {
                return $overridePath;
            }
        }
        
        return $templatePath;
    }
    
    /**
     * Controller-Override laden
     */
    public static function loadController($controllerName)
    {
        self::init();
        
        $overrideKey = 'controller_' . $controllerName;
        
        if (isset(self::$overrides[$overrideKey]) && self::$overrides[$overrideKey]['active']) {
            $overridePath = self::$overrides[$overrideKey]['path'];
            
            if (file_exists($overridePath)) {
                require_once $overridePath;
                return true;
            }
        }
        
        return false;
    }
    
    /**
     * Override entfernen
     */
    public static function removeOverride($overrideKey, $moduleName)
    {
        if (isset(self::$overrides[$overrideKey])) {
            self::$overrides[$overrideKey]['active'] = false;
        }
        
        // Override aus Datenbank entfernen
        self::removeOverrideFromDatabase($overrideKey, $moduleName);
    }
    
    /**
     * Override-Statistiken abrufen
     */
    public static function getOverrideStatistics()
    {
        self::init();
        
        $stats = [
            'class' => 0,
            'template' => 0,
            'controller' => 0,
            'total' => 0
        ];
        
        foreach (self::$overrides as $override) {
            if ($override['active']) {
                $stats[$override['type']]++;
                $stats['total']++;
            }
        }
        
        return $stats;
    }
    
    /**
     * Overrides aus Datenbank laden
     */
    private static function loadOverridesFromDatabase()
    {
        try {
            $conn = DriverManager::getConnection([
                'url' => getenv('DATABASE_URL') ?: 'mysql://root:password@localhost/webshop'
            ]);
            
            $stmt = $conn->prepare('
                SELECT override_key, override_type, original_path, override_path, module_name, active
                FROM ws_module_override 
                WHERE active = 1 
                ORDER BY module_name ASC
            ');
            $stmt->execute();
            
            $overrides = $stmt->fetchAllAssociative();
            
            foreach ($overrides as $override) {
                self::$overrides[$override['override_key']] = [
                    'type' => $override['override_type'],
                    'original' => $override['original_path'],
                    'path' => $override['override_path'],
                    'module' => $override['module_name'],
                    'active' => (bool)$override['active']
                ];
            }
            
        } catch (Exception $e) {
            error_log('Override-Datenbank Fehler: ' . $e->getMessage());
        }
    }
    
    /**
     * Override in Datenbank speichern
     */
    private static function saveOverrideToDatabase($overrideKey, $type, $originalPath, $overridePath, $moduleName)
    {
        try {
            $conn = DriverManager::getConnection([
                'url' => getenv('DATABASE_URL') ?: 'mysql://root:password@localhost/webshop'
            ]);
            
            $stmt = $conn->prepare('
                INSERT INTO ws_module_override (
                    override_key, override_type, original_path, override_path, 
                    module_name, active, created_at
                ) VALUES (?, ?, ?, ?, ?, 1, NOW())
                ON DUPLICATE KEY UPDATE 
                    override_path = ?, active = 1, updated_at = NOW()
            ');
            
            $stmt->execute([
                $overrideKey,
                $type,
                $originalPath,
                $overridePath,
                $moduleName,
                $overridePath
            ]);
            
        } catch (Exception $e) {
            error_log('Override-Speicher Fehler: ' . $e->getMessage());
        }
    }
    
    /**
     * Override aus Datenbank entfernen
     */
    private static function removeOverrideFromDatabase($overrideKey, $moduleName)
    {
        try {
            $conn = DriverManager::getConnection([
                'url' => getenv('DATABASE_URL') ?: 'mysql://root:password@localhost/webshop'
            ]);
            
            $stmt = $conn->prepare('
                UPDATE ws_module_override 
                SET active = 0, updated_at = NOW()
                WHERE override_key = ? AND module_name = ?
            ');
            $stmt->execute([$overrideKey, $moduleName]);
            
        } catch (Exception $e) {
            error_log('Override-Entfernung Fehler: ' . $e->getMessage());
        }
    }
    
    /**
     * Override-Pfad generieren
     */
    public static function generateOverridePath($moduleName, $type, $originalPath)
    {
        $modulePath = __DIR__ . '/../../modules/' . $moduleName . '/';
        
        switch ($type) {
            case 'class':
                return $modulePath . 'override/classes/' . basename($originalPath);
                
            case 'template':
                return $modulePath . 'override/templates/' . $originalPath;
                
            case 'controller':
                return $modulePath . 'override/controllers/' . $originalPath;
                
            default:
                return $modulePath . 'override/' . $originalPath;
        }
    }
    
    /**
     * Override-Verzeichnisse erstellen
     */
    public static function createOverrideDirectories($moduleName)
    {
        $modulePath = __DIR__ . '/../../modules/' . $moduleName . '/';
        $overridePath = $modulePath . 'override/';
        
        $directories = [
            $overridePath,
            $overridePath . 'classes/',
            $overridePath . 'templates/',
            $overridePath . 'controllers/'
        ];
        
        foreach ($directories as $dir) {
            if (!is_dir($dir)) {
                mkdir($dir, 0755, true);
            }
        }
        
        return true;
    }
    
    /**
     * Override-Kompatibilität prüfen
     */
    public static function checkOverrideCompatibility($originalPath, $overridePath)
    {
        if (!file_exists($originalPath)) {
            return false;
        }
        
        if (!file_exists($overridePath)) {
            return false;
        }
        
        // Prüfen ob Override-Datei neuer ist
        $originalTime = filemtime($originalPath);
        $overrideTime = filemtime($overridePath);
        
        return $overrideTime >= $originalTime;
    }
    
    /**
     * Override-Liste für Admin-Interface
     */
    public static function getOverrideList()
    {
        self::init();
        
        $list = [];
        foreach (self::$overrides as $key => $override) {
            if ($override['active']) {
                $list[] = [
                    'key' => $key,
                    'type' => $override['type'],
                    'original' => $override['original'],
                    'path' => $override['path'],
                    'module' => $override['module']
                ];
            }
        }
        
        return $list;
    }
    
    /**
     * Override-Priority-System
     */
    public static function getOverridePriority($overrideKey)
    {
        // Module-spezifische Prioritäten
        $priorities = [
            'payment' => 100,
            'shipping' => 90,
            'theme' => 80,
            'default' => 50
        ];
        
        if (isset(self::$overrides[$overrideKey])) {
            $moduleName = self::$overrides[$overrideKey]['module'];
            
            foreach ($priorities as $prefix => $priority) {
                if (strpos($moduleName, $prefix) === 0) {
                    return $priority;
                }
            }
        }
        
        return $priorities['default'];
    }
}