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

namespace App\Admin\Controllers;

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

class AdminDashboardController
{
    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);
            
            // Statistiken laden
            $stats = $this->getStats($conn);
            
            // Letzte Bestellungen laden
            $recentOrders = $this->getRecentOrders($conn);
            
            $this->render('admin/dashboard.html.twig', [
                'title' => 'Webshop Admin - Dashboard',
                'user_name' => $_SESSION['admin_user_name'],
                'stats' => $stats,
                'recent_orders' => $recentOrders
            ]);
            
        } catch (Exception $e) {
            $this->render('admin/dashboard.html.twig', [
                'title' => 'Webshop Admin - Dashboard',
                'user_name' => $_SESSION['admin_user_name'],
                'stats' => [
                    'orders' => 0,
                    'products' => 0,
                    'customers' => 0,
                    'revenue' => 0
                ],
                'recent_orders' => []
            ]);
        }
    }

    private function getStats($conn)
    {
        // Bestellungen zählen
        $stmt = $conn->prepare('SELECT COUNT(*) as count FROM ws_order');
        $stmt->execute();
        $orders = $stmt->fetchAssociative()['count'];

        // Produkte zählen
        $stmt = $conn->prepare('SELECT COUNT(*) as count FROM ws_product');
        $stmt->execute();
        $products = $stmt->fetchAssociative()['count'];

        // Kunden zählen
        $stmt = $conn->prepare('SELECT COUNT(*) as count FROM ws_user WHERE is_admin = 0');
        $stmt->execute();
        $customers = $stmt->fetchAssociative()['count'];

        // Umsatz berechnen
        $stmt = $conn->prepare('SELECT SUM(total) as total FROM ws_order WHERE status = "completed"');
        $stmt->execute();
        $revenue = $stmt->fetchAssociative()['total'] ?: 0;

        return [
            'orders' => $orders,
            'products' => $products,
            'customers' => $customers,
            'revenue' => number_format($revenue, 2)
        ];
    }

    private function getRecentOrders($conn)
    {
        $stmt = $conn->prepare('
            SELECT o.*, u.firstname, u.lastname 
            FROM ws_order o 
            LEFT JOIN ws_user u ON o.user_id = u.id 
            ORDER BY o.created_at DESC 
            LIMIT 10
        ');
        $stmt->execute();
        
        $orders = [];
        while ($row = $stmt->fetchAssociative()) {
            $orders[] = [
                'id' => $row['id'],
                'customer_name' => $row['firstname'] . ' ' . $row['lastname'],
                'status' => $row['status'],
                'status_color' => $this->getStatusColor($row['status']),
                'total' => number_format($row['total'], 2),
                'created_at' => date('d.m.Y H:i', strtotime($row['created_at']))
            ];
        }
        
        return $orders;
    }

    private function getStatusColor($status)
    {
        switch ($status) {
            case 'pending':
                return 'warning';
            case 'completed':
                return 'success';
            case 'cancelled':
                return 'danger';
            default:
                return 'secondary';
        }
    }

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