Initial commit

flutter_app/lib/services/announcement_service.dart

@@ -0,0 +1,71 @@
+import "../config/api_config.dart";
+import "../models/announcement.dart";
+import "api_client.dart";
+import "mock_data.dart";
+
+class AnnouncementService {
+  final ApiClient _client;
+
+  AnnouncementService(this._client);
+
+  Future<List<Announcement>> fetchAnnouncements({
+    bool activeOnly = false,
+  }) async {
+    if (ApiConfig.useMockData) {
+      final items = List<Announcement>.from(MockDataStore.announcements);
+      if (activeOnly) {
+        return items.where((item) => item.active).toList();
+      }
+      return items;
+    }
+    final query = activeOnly ? {"active": "true"} : null;
+    final data = await _client.getList(ApiConfig.announcements, query: query);
+    return data
+        .map((item) => Announcement.fromJson(item as Map<String, dynamic>))
+        .toList();
+  }
+
+  Future<Announcement> createAnnouncement(Announcement announcement) async {
+    if (ApiConfig.useMockData) {
+      final created = Announcement(
+        id: "announcement-${DateTime.now().millisecondsSinceEpoch}",
+        title: announcement.title,
+        content: announcement.content,
+        priority: announcement.priority,
+        active: announcement.active,
+      );
+      MockDataStore.announcements.add(created);
+      return created;
+    }
+    final data = await _client.post(
+      ApiConfig.announcements,
+      announcement.toJson(),
+    );
+    return Announcement.fromJson(data);
+  }
+
+  Future<Announcement> updateAnnouncement(Announcement announcement) async {
+    if (ApiConfig.useMockData) {
+      final index = MockDataStore.announcements.indexWhere(
+        (item) => item.id == announcement.id,
+      );
+      if (index != -1) {
+        MockDataStore.announcements[index] = announcement;
+      }
+      return announcement;
+    }
+    final data = await _client.put(
+      "${ApiConfig.announcements}/${announcement.id}",
+      announcement.toJson(),
+    );
+    return Announcement.fromJson(data);
+  }
+
+  Future<void> deleteAnnouncement(String id) async {
+    if (ApiConfig.useMockData) {
+      MockDataStore.announcements.removeWhere((item) => item.id == id);
+      return;
+    }
+    await _client.delete("${ApiConfig.announcements}/$id");
+  }
+}