implement video download

needs check, if converted files can be run on device

Signed-off-by: Peter Siegmund <developer@mars3142.org>

server/cinema/lib/feature/video/data/services/video.service.dart

@@ -0,0 +1,75 @@
+import 'dart:convert';
+
+import 'package:cinema/common/video_downloader.dart';
+import 'package:injectable/injectable.dart';
+import 'package:shelf/shelf.dart';
+import 'package:shelf_router/shelf_router.dart';
+
+part 'video.service.g.dart';
+
+@injectable
+class VideoService {
+  final VideoDownloader _videoDownloader;
+
+  VideoService(this._videoDownloader);
+
+  @Route.get('/<videoId>')
+  Future<Response> downloadVideo(Request request, String videoId) async {
+    // Validate video ID (YouTube IDs are 11 characters, alphanumeric with - and _)
+    if (!RegExp(r'^[a-zA-Z0-9_-]{11}$').hasMatch(videoId)) {
+      return Response(
+        400,
+        body: jsonEncode({'error': 'Invalid YouTube video ID'}),
+        headers: {'Content-Type': 'application/json'},
+      );
+    }
+
+    // Check if already cached
+    if (await _videoDownloader.isCached(videoId)) {
+      return Response.ok(
+        jsonEncode({
+          'status': 'cached',
+          'videoId': videoId,
+          'path': '${VideoDownloader.cacheDir}/$videoId/video.mp4',
+        }),
+        headers: {'Content-Type': 'application/json'},
+      );
+    }
+
+    // Download and resize
+    final path = await _videoDownloader.downloadAndResize(videoId);
+
+    if (path == null) {
+      return Response(
+        500,
+        body: jsonEncode({
+          'error': 'Failed to download or resize video',
+          'videoId': videoId,
+        }),
+        headers: {'Content-Type': 'application/json'},
+      );
+    }
+
+    return Response.ok(
+      jsonEncode({
+        'status': 'downloaded',
+        'videoId': videoId,
+        'path': path,
+        'size': '${VideoDownloader.maxWidth}x${VideoDownloader.maxHeight} (max)',
+      }),
+      headers: {'Content-Type': 'application/json'},
+    );
+  }
+
+  @Route.get('/')
+  Future<Response> listVideos(Request request) async {
+    final videos = await _videoDownloader.getCachedVideos();
+
+    return Response.ok(
+      jsonEncode({'videos': videos}),
+      headers: {'Content-Type': 'application/json'},
+    );
+  }
+
+  Router get router => _$VideoServiceRouter(this);
+}