add success page (#27)

Reviewed-on: #27

src/Service/EventService.php

@@ -0,0 +1,50 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Service;
+
+use Symfony\Component\HttpFoundation\RedirectResponse;
+use Symfony\Component\HttpFoundation\Response;
+
+class EventService
+{
+    private const EVENT_DATA = [
+        'title' => 'Abiball 2025',
+        'description' => 'Der Abiball der Freien Waldorfschule Bremen Osterholz und Touler Straße',
+        'location' => 'Graubündener Str. 4, 28325 Bremen',
+        'start' => '20250628T173000',
+        'end' => '20250629T030000',
+    ];
+
+    public function generateIcs(): Response
+    {
+        $data = [
+            'BEGIN:VCALENDAR',
+            'VERSION:2.0',
+            'BEGIN:VEVENT',
+            'DTSTART:' . self::EVENT_DATA['start'],
+            'DTEND:' . self::EVENT_DATA['end'],
+            'SUMMARY:' . self::EVENT_DATA['title'],
+            'DESCRIPTION:' . self::EVENT_DATA['description'],
+            'LOCATION:' . self::EVENT_DATA['location'],
+            'END:VEVENT',
+            'END:VCALENDAR'
+        ];
+
+        return new Response(implode("\r\n", $data), headers: [
+            'Content-Type' => 'text/calendar; charset=utf-8',
+            'Content-Disposition' => 'attachment; filename="event.ics"'
+        ]);
+    }
+
+    public function generateGoogleRedirect(): Response
+    {
+        return new RedirectResponse('https://calendar.google.com/calendar/render?' . http_build_query([
+                'action' => 'TEMPLATE',
+                'text' => self::EVENT_DATA['title'],
+                'dates' => self::EVENT_DATA['start'] . '/' . self::EVENT_DATA['end'],
+                'details' => self::EVENT_DATA['description'],
+                'location' => self::EVENT_DATA['location'],
+            ]));
+    }
+}