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

namespace App\Front\Controllers;

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

class CartController
{
    public function index()
    {
        // Session starten
        session_start();
        
        // Warenkorb aus Session laden
        $cart = $_SESSION['cart'] ?? [];
        
        if (empty($cart)) {
            $this->render('front/cart/empty.html.twig', [
                'title' => 'Warenkorb - Webshop'
            ]);
            return;
        }

        // 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/cart/index.html.twig', [
                'title' => 'Warenkorb - Webshop',
                'cart_items' => $cartItems,
                'total' => $total
            ]);
            
        } catch (Exception $e) {
            $this->render('front/cart/index.html.twig', [
                'title' => 'Warenkorb - Webshop',
                'cart_items' => [],
                'total' => 0,
                'error' => 'Datenbankfehler: ' . $e->getMessage()
            ]);
        }
    }

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

        $productId = $_POST['product_id'] ?? 0;
        $quantity = (int)($_POST['quantity'] ?? 1);

        if ($productId <= 0 || $quantity <= 0) {
            header('Location: /products?error=Ungültige Produktdaten');
            exit;
        }

        // Session starten
        session_start();
        
        // Warenkorb initialisieren
        if (!isset($_SESSION['cart'])) {
            $_SESSION['cart'] = [];
        }

        // Produkt zum Warenkorb hinzufügen
        if (isset($_SESSION['cart'][$productId])) {
            $_SESSION['cart'][$productId] += $quantity;
        } else {
            $_SESSION['cart'][$productId] = $quantity;
        }

        header('Location: /cart?success=Produkt zum Warenkorb hinzugefügt');
        exit;
    }

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

        $productId = $_POST['product_id'] ?? 0;
        $quantity = (int)($_POST['quantity'] ?? 0);

        // Session starten
        session_start();

        if ($quantity <= 0) {
            // Produkt aus Warenkorb entfernen
            unset($_SESSION['cart'][$productId]);
        } else {
            // Menge aktualisieren
            $_SESSION['cart'][$productId] = $quantity;
        }

        header('Location: /cart?success=Warenkorb aktualisiert');
        exit;
    }

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

        $productId = $_POST['product_id'] ?? 0;

        // Session starten
        session_start();

        // Produkt aus Warenkorb entfernen
        unset($_SESSION['cart'][$productId]);

        header('Location: /cart?success=Produkt aus Warenkorb entfernt');
        exit;
    }

    public function clear()
    {
        // Session starten
        session_start();

        // Warenkorb leeren
        $_SESSION['cart'] = [];

        header('Location: /cart?success=Warenkorb geleert');
        exit;
    }

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