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

namespace App\Admin\Controllers;

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

class AdminProductController
{
    public function index()
    {
        // Session prüfen
        session_start();
        if (!isset($_SESSION['admin_user_id'])) {
            header('Location: /admin/login');
            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 laden
            $stmt = $conn->prepare('
                SELECT p.*, c.name as category_name 
                FROM ws_product p 
                LEFT JOIN ws_category c ON p.category_id = c.id 
                ORDER BY p.created_at DESC
            ');
            $stmt->execute();
            
            $products = [];
            while ($row = $stmt->fetchAssociative()) {
                $products[] = $row;
            }
            
            $this->render('admin/products/index.html.twig', [
                'title' => 'Webshop Admin - Produkte',
                'user_name' => $_SESSION['admin_user_name'],
                'products' => $products
            ]);
            
        } catch (Exception $e) {
            $this->render('admin/products/index.html.twig', [
                'title' => 'Webshop Admin - Produkte',
                'user_name' => $_SESSION['admin_user_name'],
                'products' => [],
                'error' => 'Datenbankfehler: ' . $e->getMessage()
            ]);
        }
    }

    public function create()
    {
        // Session prüfen
        session_start();
        if (!isset($_SESSION['admin_user_id'])) {
            header('Location: /admin/login');
            exit;
        }

        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->store();
            return;
        }

        // Kategorien für Dropdown laden
        $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);
            
            $stmt = $conn->prepare('SELECT id, name FROM ws_category ORDER BY name');
            $stmt->execute();
            
            $categories = [];
            while ($row = $stmt->fetchAssociative()) {
                $categories[] = $row;
            }
            
            $this->render('admin/products/create.html.twig', [
                'title' => 'Webshop Admin - Neues Produkt',
                'user_name' => $_SESSION['admin_user_name'],
                'categories' => $categories
            ]);
            
        } catch (Exception $e) {
            $this->render('admin/products/create.html.twig', [
                'title' => 'Webshop Admin - Neues Produkt',
                'user_name' => $_SESSION['admin_user_name'],
                'categories' => [],
                'error' => 'Datenbankfehler: ' . $e->getMessage()
            ]);
        }
    }

    private function store()
    {
        $name = $_POST['name'] ?? '';
        $description = $_POST['description'] ?? '';
        $price = $_POST['price'] ?? 0;
        $stock = $_POST['stock'] ?? 0;
        $category_id = $_POST['category_id'] ?? null;

        if (empty($name) || empty($price)) {
            header('Location: /admin/products/create?error=Fehlende Pflichtfelder');
            exit;
        }

        $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);
            
            $stmt = $conn->prepare('
                INSERT INTO ws_product (name, description, price, stock, category_id) 
                VALUES (?, ?, ?, ?, ?)
            ');
            $stmt->execute([$name, $description, $price, $stock, $category_id]);
            
            header('Location: /admin/products?success=Produkt erfolgreich erstellt');
            exit;
            
        } catch (Exception $e) {
            header('Location: /admin/products/create?error=Datenbankfehler: ' . $e->getMessage());
            exit;
        }
    }

    public function edit($id)
    {
        // Session prüfen
        session_start();
        if (!isset($_SESSION['admin_user_id'])) {
            header('Location: /admin/login');
            exit;
        }

        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->update($id);
            return;
        }

        $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);
            
            // Produkt laden
            $stmt = $conn->prepare('SELECT * FROM ws_product WHERE id = ?');
            $stmt->execute([$id]);
            $product = $stmt->fetchAssociative();
            
            if (!$product) {
                header('Location: /admin/products?error=Produkt nicht gefunden');
                exit;
            }
            
            // Kategorien laden
            $stmt = $conn->prepare('SELECT id, name FROM ws_category ORDER BY name');
            $stmt->execute();
            
            $categories = [];
            while ($row = $stmt->fetchAssociative()) {
                $categories[] = $row;
            }
            
            $this->render('admin/products/edit.html.twig', [
                'title' => 'Webshop Admin - Produkt bearbeiten',
                'user_name' => $_SESSION['admin_user_name'],
                'product' => $product,
                'categories' => $categories
            ]);
            
        } catch (Exception $e) {
            header('Location: /admin/products?error=Datenbankfehler: ' . $e->getMessage());
            exit;
        }
    }

    private function update($id)
    {
        $name = $_POST['name'] ?? '';
        $description = $_POST['description'] ?? '';
        $price = $_POST['price'] ?? 0;
        $stock = $_POST['stock'] ?? 0;
        $category_id = $_POST['category_id'] ?? null;

        if (empty($name) || empty($price)) {
            header('Location: /admin/products/edit/' . $id . '?error=Fehlende Pflichtfelder');
            exit;
        }

        $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);
            
            $stmt = $conn->prepare('
                UPDATE ws_product 
                SET name = ?, description = ?, price = ?, stock = ?, category_id = ? 
                WHERE id = ?
            ');
            $stmt->execute([$name, $description, $price, $stock, $category_id, $id]);
            
            header('Location: /admin/products?success=Produkt erfolgreich aktualisiert');
            exit;
            
        } catch (Exception $e) {
            header('Location: /admin/products/edit/' . $id . '?error=Datenbankfehler: ' . $e->getMessage());
            exit;
        }
    }

    public function delete($id)
    {
        // Session prüfen
        session_start();
        if (!isset($_SESSION['admin_user_id'])) {
            header('Location: /admin/login');
            exit;
        }

        $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);
            
            $stmt = $conn->prepare('DELETE FROM ws_product WHERE id = ?');
            $stmt->execute([$id]);
            
            header('Location: /admin/products?success=Produkt erfolgreich gelöscht');
            exit;
            
        } catch (Exception $e) {
            header('Location: /admin/products?error=Datenbankfehler: ' . $e->getMessage());
            exit;
        }
    }

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