<?php
/**
 * Copyright seit 2024 Webshop System
 *
 * Frontend-Checkout-Controller für das Webshop-System
 *
 * @author    Webshop System
 * @license   GPL v3
 */

namespace App\Front\Controllers;

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

class CheckoutController
{
    public function index()
    {
        // Session starten
        session_start();
        
        // Warenkorb prüfen
        $cart = $_SESSION['cart'] ?? [];
        
        if (empty($cart)) {
            header('Location: /cart');
            exit;
        }

        // DB-Verbindung herstellen
        $connectionParams = [
            'dbname' => getenv('DB_DATABASE') ?: 'freeshop',
            'user' => getenv('DB_USERNAME') ?: 'freeshop_user',
            'password' => getenv('DB_PASSWORD') ?: 'freeshop_password',
            'host' => getenv('DB_HOST') ?: 'db',
            'driver' => 'pdo_mysql',
            'port' => getenv('DB_PORT') ?: 3306,
            'charset' => 'utf8mb4',
        ];

        try {
            $conn = DriverManager::getConnection($connectionParams);
            
            // Produkte aus Warenkorb laden
            $cartItems = [];
            $total = 0;
            
            foreach ($cart as $productId => $quantity) {
                $stmt = $conn->prepare('SELECT * FROM ws_product WHERE id = ?');
                $stmt->execute([$productId]);
                $product = $stmt->fetchAssociative();
                
                if ($product) {
                    $product['quantity'] = $quantity;
                    $product['subtotal'] = $product['price'] * $quantity;
                    $cartItems[] = $product;
                    $total += $product['subtotal'];
                }
            }
            
            $this->render('front/checkout/index.html.twig', [
                'title' => 'Checkout - Webshop',
                'cart_items' => $cartItems,
                'total' => $total
            ]);
            
        } catch (Exception $e) {
            $this->render('front/checkout/index.html.twig', [
                'title' => 'Checkout - Webshop',
                'cart_items' => [],
                'total' => 0,
                'error' => 'Datenbankfehler: ' . $e->getMessage()
            ]);
        }
    }

    public function process()
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            header('Location: /checkout');
            exit;
        }

        // Session starten
        session_start();
        
        // Warenkorb prüfen
        $cart = $_SESSION['cart'] ?? [];
        
        if (empty($cart)) {
            header('Location: /cart');
            exit;
        }

        // Formulardaten validieren
        $email = $_POST['email'] ?? '';
        $firstname = $_POST['firstname'] ?? '';
        $lastname = $_POST['lastname'] ?? '';
        $address = $_POST['address'] ?? '';
        $city = $_POST['city'] ?? '';
        $postcode = $_POST['postcode'] ?? '';
        $country = $_POST['country'] ?? '';

        if (empty($email) || empty($firstname) || empty($lastname) || empty($address) || empty($city) || empty($postcode)) {
            header('Location: /checkout?error=Bitte füllen Sie alle Pflichtfelder aus');
            exit;
        }

        // DB-Verbindung herstellen
        $connectionParams = [
            'dbname' => getenv('DB_DATABASE') ?: 'freeshop',
            'user' => getenv('DB_USERNAME') ?: 'freeshop_user',
            'password' => getenv('DB_PASSWORD') ?: 'freeshop_password',
            'host' => getenv('DB_HOST') ?: 'db',
            'driver' => 'pdo_mysql',
            'port' => getenv('DB_PORT') ?: 3306,
            'charset' => 'utf8mb4',
        ];

        try {
            $conn = DriverManager::getConnection($connectionParams);
            
            // Kunde erstellen oder finden
            $stmt = $conn->prepare('SELECT id FROM ws_user WHERE email = ?');
            $stmt->execute([$email]);
            $existingUser = $stmt->fetchAssociative();
            
            if ($existingUser) {
                $userId = $existingUser['id'];
            } else {
                // Neuen Kunden erstellen
                $stmt = $conn->prepare('
                    INSERT INTO ws_user (email, firstname, lastname, is_admin) 
                    VALUES (?, ?, ?, 0)
                ');
                $stmt->execute([$email, $firstname, $lastname]);
                $userId = $conn->lastInsertId();
            }
            
            // Bestellung erstellen
            $total = 0;
            foreach ($cart as $productId => $quantity) {
                $stmt = $conn->prepare('SELECT price FROM ws_product WHERE id = ?');
                $stmt->execute([$productId]);
                $product = $stmt->fetchAssociative();
                if ($product) {
                    $total += $product['price'] * $quantity;
                }
            }
            
            $stmt = $conn->prepare('
                INSERT INTO ws_order (user_id, total, status) 
                VALUES (?, ?, "pending")
            ');
            $stmt->execute([$userId, $total]);
            $orderId = $conn->lastInsertId();
            
            // Bestellpositionen erstellen
            foreach ($cart as $productId => $quantity) {
                $stmt = $conn->prepare('SELECT price FROM ws_product WHERE id = ?');
                $stmt->execute([$productId]);
                $product = $stmt->fetchAssociative();
                
                if ($product) {
                    $stmt = $conn->prepare('
                        INSERT INTO ws_order_product (order_id, product_id, quantity, price) 
                        VALUES (?, ?, ?, ?)
                    ');
                    $stmt->execute([$orderId, $productId, $quantity, $product['price']]);
                }
            }
            
            // Warenkorb leeren
            $_SESSION['cart'] = [];
            
            // Zur Bestellbestätigung weiterleiten
            header('Location: /checkout/success?order_id=' . $orderId);
            exit;
            
        } catch (Exception $e) {
            header('Location: /checkout?error=Datenbankfehler: ' . $e->getMessage());
            exit;
        }
    }

    public function success()
    {
        $orderId = $_GET['order_id'] ?? 0;
        
        if (!$orderId) {
            header('Location: /');
            exit;
        }

        // DB-Verbindung herstellen
        $connectionParams = [
            'dbname' => getenv('DB_DATABASE') ?: 'freeshop',
            'user' => getenv('DB_USERNAME') ?: 'freeshop_user',
            'password' => getenv('DB_PASSWORD') ?: 'freeshop_password',
            'host' => getenv('DB_HOST') ?: 'db',
            'driver' => 'pdo_mysql',
            'port' => getenv('DB_PORT') ?: 3306,
            'charset' => 'utf8mb4',
        ];

        try {
            $conn = DriverManager::getConnection($connectionParams);
            
            // Bestellung laden
            $stmt = $conn->prepare('
                SELECT o.*, u.firstname, u.lastname, u.email 
                FROM ws_order o 
                LEFT JOIN ws_user u ON o.user_id = u.id 
                WHERE o.id = ?
            ');
            $stmt->execute([$orderId]);
            $order = $stmt->fetchAssociative();
            
            if (!$order) {
                header('Location: /');
                exit;
            }
            
            // Bestellpositionen laden
            $stmt = $conn->prepare('
                SELECT op.*, p.name 
                FROM ws_order_product op 
                LEFT JOIN ws_product p ON op.product_id = p.id 
                WHERE op.order_id = ?
            ');
            $stmt->execute([$orderId]);
            
            $orderItems = [];
            while ($row = $stmt->fetchAssociative()) {
                $orderItems[] = $row;
            }
            
            $this->render('front/checkout/success.html.twig', [
                'title' => 'Bestellbestätigung - Webshop',
                'order' => $order,
                'order_items' => $orderItems
            ]);
            
        } catch (Exception $e) {
            $this->render('front/checkout/success.html.twig', [
                'title' => 'Bestellbestätigung - Webshop',
                'order' => ['id' => $orderId],
                'order_items' => [],
                'error' => 'Datenbankfehler: ' . $e->getMessage()
            ]);
        }
    }

    protected function render($template, $data = [])
    {
        // Einfache Template-Engine (später durch Twig ersetzen)
        extract($data);
        include __DIR__ . '/../../templates/' . $template;
    }
}