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

namespace App\Front\Controllers;

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

class NewsletterController
{
    public function subscribe()
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            header('Content-Type: application/json');
            echo json_encode(['success' => false, 'message' => 'Ungültige Anfrage']);
            return;
        }
        
        $email = $_POST['email'] ?? '';
        $firstName = $_POST['first_name'] ?? '';
        $lastName = $_POST['last_name'] ?? '';
        $customerId = $_SESSION['customer_id'] ?? null;
        
        // Validierung
        if (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
            header('Content-Type: application/json');
            echo json_encode(['success' => false, 'message' => 'Ungültige E-Mail-Adresse']);
            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);
            
            // Prüfen ob bereits abonniert
            $stmt = $conn->prepare('SELECT id FROM ws_newsletter WHERE email = ? AND active = 1');
            $stmt->execute([$email]);
            $existing = $stmt->fetchAssociative();
            
            if ($existing) {
                header('Content-Type: application/json');
                echo json_encode(['success' => false, 'message' => 'E-Mail-Adresse ist bereits abonniert']);
                return;
            }
            
            // Newsletter-Abonnement erstellen
            $stmt = $conn->prepare('
                INSERT INTO ws_newsletter (email, first_name, last_name, customer_id, active, created_at)
                VALUES (?, ?, ?, ?, 1, NOW())
            ');
            $stmt->execute([$email, $firstName, $lastName, $customerId]);
            
            // Willkommens-E-Mail senden
            $this->sendWelcomeNewsletterEmail($email, $firstName);
            
            header('Content-Type: application/json');
            echo json_encode([
                'success' => true, 
                'message' => 'Newsletter-Abonnement erfolgreich!'
            ]);
            
        } catch (Exception $e) {
            header('Content-Type: application/json');
            echo json_encode(['success' => false, 'message' => 'Fehler: ' . $e->getMessage()]);
        }
    }
    
    public function unsubscribe()
    {
        $token = $_GET['token'] ?? '';
        
        if (empty($token)) {
            $this->render('front/newsletter/error.html.twig', [
                'title' => 'Webshop - Newsletter Fehler',
                'message' => 'Ungültiger Abmelde-Link'
            ]);
            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);
            
            // Newsletter-Abonnement deaktivieren
            $stmt = $conn->prepare('
                UPDATE ws_newsletter 
                SET active = 0, unsubscribed_at = NOW() 
                WHERE unsubscribe_token = ?
            ');
            $stmt->execute([$token]);
            
            if ($stmt->rowCount() > 0) {
                $this->render('front/newsletter/unsubscribed.html.twig', [
                    'title' => 'Webshop - Newsletter abgemeldet',
                    'message' => 'Sie wurden erfolgreich vom Newsletter abgemeldet.'
                ]);
            } else {
                $this->render('front/newsletter/error.html.twig', [
                    'title' => 'Webshop - Newsletter Fehler',
                    'message' => 'Ungültiger Abmelde-Link'
                ]);
            }
            
        } catch (Exception $e) {
            $this->render('front/newsletter/error.html.twig', [
                'title' => 'Webshop - Newsletter Fehler',
                'message' => 'Fehler: ' . $e->getMessage()
            ]);
        }
    }
    
    public function preferences()
    {
        if (!isset($_SESSION['customer_id'])) {
            header('Location: /login?redirect=' . urlencode('/newsletter/preferences'));
            exit;
        }
        
        if ($_SERVER['REQUEST_METHOD'] === 'POST') {
            $this->updatePreferences();
        } else {
            $this->loadPreferences();
        }
    }
    
    private function loadPreferences()
    {
        $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 * FROM ws_newsletter 
                WHERE customer_id = ? AND active = 1
            ');
            $stmt->execute([$_SESSION['customer_id']]);
            $newsletter = $stmt->fetchAssociative();
            
            $this->render('front/newsletter/preferences.html.twig', [
                'title' => 'Webshop - Newsletter-Einstellungen',
                'newsletter' => $newsletter
            ]);
            
        } catch (Exception $e) {
            $this->render('front/newsletter/preferences.html.twig', [
                'title' => 'Webshop - Newsletter-Einstellungen',
                'error' => 'Fehler beim Laden der Einstellungen: ' . $e->getMessage()
            ]);
        }
    }
    
    private function updatePreferences()
    {
        $active = isset($_POST['active']) ? 1 : 0;
        $categories = $_POST['categories'] ?? [];
        
        $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);
            
            if ($active) {
                // Newsletter aktivieren/aktualisieren
                $stmt = $conn->prepare('
                    INSERT INTO ws_newsletter (customer_id, email, first_name, last_name, preferences, active, created_at)
                    VALUES (?, ?, ?, ?, ?, 1, NOW())
                    ON DUPLICATE KEY UPDATE 
                    preferences = VALUES(preferences),
                    active = 1,
                    updated_at = NOW()
                ');
                
                $preferences = json_encode($categories);
                $stmt->execute([
                    $_SESSION['customer_id'],
                    $_SESSION['customer_email'],
                    explode(' ', $_SESSION['customer_name'])[0],
                    explode(' ', $_SESSION['customer_name'])[1] ?? '',
                    $preferences
                ]);
            } else {
                // Newsletter deaktivieren
                $stmt = $conn->prepare('
                    UPDATE ws_newsletter 
                    SET active = 0, unsubscribed_at = NOW()
                    WHERE customer_id = ?
                ');
                $stmt->execute([$_SESSION['customer_id']]);
            }
            
            $this->render('front/newsletter/preferences.html.twig', [
                'title' => 'Webshop - Newsletter-Einstellungen',
                'success' => 'Einstellungen erfolgreich gespeichert',
                'newsletter' => ['active' => $active, 'preferences' => json_encode($categories)]
            ]);
            
        } catch (Exception $e) {
            $this->render('front/newsletter/preferences.html.twig', [
                'title' => 'Webshop - Newsletter-Einstellungen',
                'error' => 'Fehler beim Speichern: ' . $e->getMessage()
            ]);
        }
    }
    
    public function preview($id)
    {
        if (!isset($_SESSION['admin_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('SELECT * FROM ws_newsletter_template WHERE id = ?');
            $stmt->execute([$id]);
            $template = $stmt->fetchAssociative();
            
            if (!$template) {
                $this->render('front/newsletter/error.html.twig', [
                    'title' => 'Webshop - Newsletter Fehler',
                    'message' => 'Template nicht gefunden'
                ]);
                return;
            }
            
            // Template mit Testdaten rendern
            $content = $this->renderNewsletterTemplate($template, [
                'first_name' => 'Test',
                'last_name' => 'Kunde',
                'unsubscribe_url' => '#'
            ]);
            
            $this->render('front/newsletter/preview.html.twig', [
                'title' => 'Webshop - Newsletter Vorschau',
                'template' => $template,
                'content' => $content
            ]);
            
        } catch (Exception $e) {
            $this->render('front/newsletter/error.html.twig', [
                'title' => 'Webshop - Newsletter Fehler',
                'message' => 'Fehler: ' . $e->getMessage()
            ]);
        }
    }
    
    private function sendWelcomeNewsletterEmail($email, $firstName)
    {
        $subject = 'Willkommen zum Newsletter!';
        $message = "
        <html>
        <head>
            <title>Newsletter Anmeldung</title>
        </head>
        <body>
            <h2>Hallo $firstName!</h2>
            <p>Vielen Dank für Ihre Anmeldung zum Webshop Newsletter!</p>
            <p>Sie erhalten ab sofort regelmäßig Informationen über:</p>
            <ul>
                <li>Neue Produkte und Angebote</li>
                <li>Exklusive Rabatte und Gutscheine</li>
                <li>Interessante Artikel und Tipps</li>
            </ul>
            <p>Falls Sie den Newsletter nicht mehr erhalten möchten, können Sie sich jederzeit <a href='/newsletter/unsubscribe'>hier abmelden</a>.</p>
            <p>Mit freundlichen Grüßen<br>Ihr Webshop-Team</p>
        </body>
        </html>
        ";
        
        $headers = 'MIME-Version: 1.0' . "\r\n";
        $headers .= 'Content-type: text/html; charset=UTF-8' . "\r\n";
        $headers .= 'From: Webshop <noreply@webshop-system.de>' . "\r\n";
        $headers .= 'Reply-To: info@webshop-system.de' . "\r\n";
        $headers .= 'X-Mailer: PHP/' . phpversion();
        
        mail($email, $subject, $message, $headers);
    }
    
    private function renderNewsletterTemplate($template, $data)
    {
        $content = $template['content'];
        
        // Platzhalter ersetzen
        foreach ($data as $key => $value) {
            $content = str_replace('{{' . $key . '}}', $value, $content);
        }
        
        return $content;
    }

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