<?php
/**
 * Copyright seit 2024 Webshop System
 *
 * Shop Controller für das Admin-Bereich
 *
 * @author    Webshop System
 * @license   GPL v3
 */

namespace App\Controllers\Admin;

use App\Core\MultiShop;
use App\Core\SessionHandler;
use App\Core\Configuration;
use Doctrine\DBAL\DriverManager;
use Doctrine\DBAL\Exception;

class ShopController extends AdminController
{
    private $multiShop;
    
    public function __construct()
    {
        parent::__construct();
        $this->multiShop = new MultiShop();
    }
    
    /**
     * Shop-Übersicht
     */
    public function index()
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        $shops = $this->multiShop->getAllShops();
        $currentShop = $this->multiShop->getCurrentShop();
        
        // Statistiken für jeden Shop
        $shopStats = [];
        foreach ($shops as $shop) {
            $shopStats[$shop['id']] = $this->multiShop->getShopStatistics($shop['id']);
        }
        
        $this->render('admin/shop/index.html.twig', [
            'title' => 'Shop-Verwaltung',
            'shops' => $shops,
            'current_shop' => $currentShop,
            'shop_stats' => $shopStats
        ]);
    }
    
    /**
     * Shop erstellen
     */
    public function create()
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->handleShopCreate();
        }
        
        $this->render('admin/shop/create.html.twig', [
            'title' => 'Neuen Shop erstellen'
        ]);
    }
    
    /**
     * Shop bearbeiten
     */
    public function edit($id)
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        $shop = $this->multiShop->getShop($id);
        
        if (!$shop) {
            $this->addFlashMessage('Shop nicht gefunden', 'error');
            $this->redirect('/admin/shop');
        }
        
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->handleShopUpdate($id);
        }
        
        $shopConfig = $this->getShopConfiguration($id);
        
        $this->render('admin/shop/edit.html.twig', [
            'title' => 'Shop bearbeiten: ' . $shop['name'],
            'shop' => $shop,
            'shop_config' => $shopConfig
        ]);
    }
    
    /**
     * Shop löschen
     */
    public function delete($id)
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        $shop = $this->multiShop->getShop($id);
        
        if (!$shop) {
            $this->addFlashMessage('Shop nicht gefunden', 'error');
            $this->redirect('/admin/shop');
        }
        
        if ($shop['is_default']) {
            $this->addFlashMessage('Standard-Shop kann nicht gelöscht werden', 'error');
            $this->redirect('/admin/shop');
        }
        
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            if ($this->multiShop->deleteShop($id)) {
                $this->addFlashMessage('Shop erfolgreich gelöscht', 'success');
            } else {
                $this->addFlashMessage('Fehler beim Löschen des Shops', 'error');
            }
            $this->redirect('/admin/shop');
        }
        
        $this->render('admin/shop/delete.html.twig', [
            'title' => 'Shop löschen: ' . $shop['name'],
            'shop' => $shop
        ]);
    }
    
    /**
     * Shop-Konfiguration
     */
    public function config($id)
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        $shop = $this->multiShop->getShop($id);
        
        if (!$shop) {
            $this->addFlashMessage('Shop nicht gefunden', 'error');
            $this->redirect('/admin/shop');
        }
        
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->handleConfigUpdate($id);
        }
        
        $shopConfig = $this->getShopConfiguration($id);
        $availableCurrencies = $this->getAvailableCurrencies();
        $availableLanguages = $this->getAvailableLanguages();
        $availableCountries = $this->getAvailableCountries();
        
        $this->render('admin/shop/config.html.twig', [
            'title' => 'Shop-Konfiguration: ' . $shop['name'],
            'shop' => $shop,
            'shop_config' => $shopConfig,
            'currencies' => $availableCurrencies,
            'languages' => $availableLanguages,
            'countries' => $availableCountries
        ]);
    }
    
    /**
     * Shop-Statistiken
     */
    public function statistics($id)
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        $shop = $this->multiShop->getShop($id);
        
        if (!$shop) {
            $this->addFlashMessage('Shop nicht gefunden', 'error');
            $this->redirect('/admin/shop');
        }
        
        $statistics = $this->multiShop->getShopStatistics($id);
        $recentOrders = $this->getRecentOrders($id);
        $topProducts = $this->getTopProducts($id);
        $customerGrowth = $this->getCustomerGrowth($id);
        
        $this->render('admin/shop/statistics.html.twig', [
            'title' => 'Shop-Statistiken: ' . $shop['name'],
            'shop' => $shop,
            'statistics' => $statistics,
            'recent_orders' => $recentOrders,
            'top_products' => $topProducts,
            'customer_growth' => $customerGrowth
        ]);
    }
    
    /**
     * Shop-Wechsel
     */
    public function switch($id)
    {
        if (!$this->checkAdminSession()) {
            $this->redirect('/admin/login');
        }
        
        if ($this->multiShop->switchShop($id)) {
            $this->addFlashMessage('Shop gewechselt', 'success');
        } else {
            $this->addFlashMessage('Fehler beim Shop-Wechsel', 'error');
        }
        
        $this->redirect('/admin/shop');
    }
    
    /**
     * Shop erstellen verarbeiten
     */
    private function handleShopCreate()
    {
        $data = [
            'name' => $_POST['name'] ?? '',
            'description' => $_POST['description'] ?? '',
            'domain' => $_POST['domain'] ?? '',
            'ssl_enabled' => isset($_POST['ssl_enabled']),
            'force_ssl' => isset($_POST['force_ssl']),
            'active' => isset($_POST['active']),
            'sort_order' => intval($_POST['sort_order'] ?? 0)
        ];
        
        // Validierung
        if (empty($data['name'])) {
            $this->addFlashMessage('Shop-Name ist erforderlich', 'error');
            return;
        }
        
        if (!empty($data['domain']) && !$this->multiShop->validateShopDomain($data['domain'])) {
            $this->addFlashMessage('Domain ist bereits vergeben oder ungültig', 'error');
            return;
        }
        
        $shopId = $this->multiShop->createShop($data);
        
        if ($shopId) {
            $this->addFlashMessage('Shop erfolgreich erstellt', 'success');
            $this->redirect('/admin/shop');
        } else {
            $this->addFlashMessage('Fehler beim Erstellen des Shops', 'error');
        }
    }
    
    /**
     * Shop aktualisieren verarbeiten
     */
    private function handleShopUpdate($id)
    {
        $data = [
            'name' => $_POST['name'] ?? '',
            'description' => $_POST['description'] ?? '',
            'domain' => $_POST['domain'] ?? '',
            'ssl_enabled' => isset($_POST['ssl_enabled']),
            'force_ssl' => isset($_POST['force_ssl']),
            'active' => isset($_POST['active']),
            'sort_order' => intval($_POST['sort_order'] ?? 0)
        ];
        
        // Validierung
        if (empty($data['name'])) {
            $this->addFlashMessage('Shop-Name ist erforderlich', 'error');
            return;
        }
        
        if (!empty($data['domain']) && !$this->multiShop->validateShopDomain($data['domain'], $id)) {
            $this->addFlashMessage('Domain ist bereits vergeben oder ungültig', 'error');
            return;
        }
        
        if ($this->multiShop->updateShop($id, $data)) {
            $this->addFlashMessage('Shop erfolgreich aktualisiert', 'success');
            $this->redirect('/admin/shop');
        } else {
            $this->addFlashMessage('Fehler beim Aktualisieren des Shops', 'error');
        }
    }
    
    /**
     * Konfiguration aktualisieren
     */
    private function handleConfigUpdate($id)
    {
        $configKeys = [
            'SHOP_NAME', 'SHOP_DESCRIPTION', 'SHOP_EMAIL', 'SHOP_PHONE',
            'SHOP_ADDRESS', 'SHOP_CITY', 'SHOP_POSTAL_CODE', 'SHOP_COUNTRY',
            'SHOP_CURRENCY', 'SHOP_LANGUAGE', 'SHOP_TIMEZONE',
            'SHOP_DATE_FORMAT', 'SHOP_TIME_FORMAT', 'SHOP_TAX_RATE',
            'SHOP_SHIPPING_COST', 'SHOP_FREE_SHIPPING_THRESHOLD',
            'SHOP_MIN_ORDER_AMOUNT', 'SHOP_MAX_ORDER_AMOUNT',
            'SHOP_STOCK_WARNING', 'SHOP_REVIEWS_ENABLED',
            'SHOP_NEWSLETTER_ENABLED', 'SHOP_MAINTENANCE_MODE',
            'SHOP_MAINTENANCE_MESSAGE'
        ];
        
        foreach ($configKeys as $key) {
            $value = $_POST[strtolower($key)] ?? '';
            $this->multiShop->setShopConfig($key, $value);
        }
        
        $this->addFlashMessage('Shop-Konfiguration aktualisiert', 'success');
        $this->redirect("/admin/shop/config/$id");
    }
    
    /**
     * Shop-Konfiguration abrufen
     */
    private function getShopConfiguration($shopId)
    {
        $config = [];
        $configKeys = [
            'SHOP_NAME', 'SHOP_DESCRIPTION', 'SHOP_EMAIL', 'SHOP_PHONE',
            'SHOP_ADDRESS', 'SHOP_CITY', 'SHOP_POSTAL_CODE', 'SHOP_COUNTRY',
            'SHOP_CURRENCY', 'SHOP_LANGUAGE', 'SHOP_TIMEZONE',
            'SHOP_DATE_FORMAT', 'SHOP_TIME_FORMAT', 'SHOP_TAX_RATE',
            'SHOP_SHIPPING_COST', 'SHOP_FREE_SHIPPING_THRESHOLD',
            'SHOP_MIN_ORDER_AMOUNT', 'SHOP_MAX_ORDER_AMOUNT',
            'SHOP_STOCK_WARNING', 'SHOP_REVIEWS_ENABLED',
            'SHOP_NEWSLETTER_ENABLED', 'SHOP_MAINTENANCE_MODE',
            'SHOP_MAINTENANCE_MESSAGE'
        ];
        
        foreach ($configKeys as $key) {
            $config[strtolower($key)] = $this->multiShop->getShopConfig($key, '');
        }
        
        return $config;
    }
    
    /**
     * Verfügbare Währungen
     */
    private function getAvailableCurrencies()
    {
        return [
            'EUR' => 'Euro (€)',
            'USD' => 'US Dollar ($)',
            'GBP' => 'British Pound (£)',
            'CHF' => 'Swiss Franc (CHF)',
            'JPY' => 'Japanese Yen (¥)',
            'CAD' => 'Canadian Dollar (C$)',
            'AUD' => 'Australian Dollar (A$)'
        ];
    }
    
    /**
     * Verfügbare Sprachen
     */
    private function getAvailableLanguages()
    {
        return [
            'de' => 'Deutsch',
            'en' => 'English',
            'fr' => 'Français',
            'es' => 'Español',
            'it' => 'Italiano',
            'nl' => 'Nederlands',
            'pl' => 'Polski',
            'ru' => 'Русский'
        ];
    }
    
    /**
     * Verfügbare Länder
     */
    private function getAvailableCountries()
    {
        try {
            $stmt = $this->conn->prepare('
                SELECT code, name FROM ws_country 
                WHERE active = 1 
                ORDER BY name ASC
            ');
            $stmt->execute();
            $countries = $stmt->fetchAllAssociative();
            
            $result = [];
            foreach ($countries as $country) {
                $result[$country['code']] = $country['name'];
            }
            
            return $result;
            
        } catch (Exception $e) {
            return [
                'DE' => 'Deutschland',
                'AT' => 'Österreich',
                'CH' => 'Schweiz',
                'US' => 'United States',
                'GB' => 'United Kingdom',
                'FR' => 'France',
                'IT' => 'Italy',
                'ES' => 'Spain'
            ];
        }
    }
    
    /**
     * Letzte Bestellungen
     */
    private function getRecentOrders($shopId)
    {
        try {
            $stmt = $this->conn->prepare('
                SELECT o.*, c.first_name, c.last_name
                FROM ws_order o
                LEFT JOIN ws_customer c ON o.customer_id = c.id
                WHERE o.shop_id = ?
                ORDER BY o.created_at DESC
                LIMIT 10
            ');
            $stmt->execute([$shopId]);
            
            return $stmt->fetchAllAssociative();
            
        } catch (Exception $e) {
            return [];
        }
    }
    
    /**
     * Top-Produkte
     */
    private function getTopProducts($shopId)
    {
        try {
            $stmt = $this->conn->prepare('
                SELECT p.*, 
                       COUNT(oi.id) as order_count,
                       SUM(oi.quantity) as total_quantity,
                       SUM(oi.price * oi.quantity) as total_revenue
                FROM ws_product p
                LEFT JOIN ws_order_item oi ON p.id = oi.product_id
                LEFT JOIN ws_order o ON oi.order_id = o.id
                WHERE p.shop_id = ? AND o.status = "completed"
                GROUP BY p.id
                ORDER BY total_revenue DESC
                LIMIT 10
            ');
            $stmt->execute([$shopId]);
            
            return $stmt->fetchAllAssociative();
            
        } catch (Exception $e) {
            return [];
        }
    }
    
    /**
     * Kundenwachstum
     */
    private function getCustomerGrowth($shopId)
    {
        try {
            $stmt = $this->conn->prepare('
                SELECT DATE(created_at) as date,
                       COUNT(*) as new_customers
                FROM ws_customer
                WHERE shop_id = ? 
                AND created_at >= DATE_SUB(NOW(), INTERVAL 30 DAY)
                GROUP BY DATE(created_at)
                ORDER BY date ASC
            ');
            $stmt->execute([$shopId]);
            
            return $stmt->fetchAllAssociative();
            
        } catch (Exception $e) {
            return [];
        }
    }
}