Fetching but Type Conversion Err

lib/album_fetch.dart

@@ -0,0 +1,53 @@
+
+import 'dart:convert';
+import 'dart:async';
+
+import 'package:http/http.dart' as http;
+
+Future<FetchAlbum> fetchArrivals() async {
+  final response = await http
+      .get(Uri.parse(DB_URL));
+
+  if (response.statusCode == 200) {
+    // If the server did return a 200 OK response,
+    // then parse the JSON.
+    return FetchAlbum.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
+  } else {
+    // If the server did not return a 200 OK response,
+    // then throw an exception.
+    throw Exception('Failed to load album');
+  }
+}
+
+class FetchAlbum {
+  final String timeOfDay;
+  final int weekDay;
+  final String tramLine;
+  final bool direction;
+
+  const FetchAlbum({
+    required this.timeOfDay,
+    required this.weekDay,
+    required this.tramLine,
+    required this.direction,
+  });
+
+  factory FetchAlbum.fromJson(Map<String, dynamic> json) {
+    return switch (json) {
+      {
+        'time_of_day': String jsonTime,
+        'week_day': int jsonDay,
+        'tram_line': String jsonTramLine,
+        'direction': bool jsonDirec,
+      } =>
+        FetchAlbum(
+          // Class : json declaration
+          timeOfDay: jsonTime,
+          weekDay: jsonDay,
+          tramLine: jsonTramLine,
+          direction: jsonDirec,
+        ),
+      _ => throw const FormatException('Failed to load album.'),
+    };
+  }
+}