feat: add methods in timeline service interface

packages/flutter_timeline_firebase/pubspec.yaml

@@ -14,6 +14,11 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  cloud_firestore: ^4.13.1
+  firebase_core: ^2.22.0
+  firebase_storage: ^11.5.1
+  uuid: ^4.2.1
+
   flutter_timeline_interface:
     git: 
        url: https://github.com/Iconica-Development/flutter_timeline.git

packages/flutter_timeline_interface/lib/src/model/timeline_reaction.dart

@@ -11,8 +11,9 @@ class TimelinePostReaction {
     required this.id,
     required this.postId,
     required this.creatorId,
-    required this.reaction,
     required this.createdAt,
+    this.reaction,
+    this.imageUrl,
     this.creator,
   });
 
@@ -28,8 +29,11 @@ class TimelinePostReaction {
   /// The creator of the post. If null it isn't loaded yet.
   final TimelinePosterUserModel? creator;
 
-  /// The reactiontext
-  final String reaction;
+  /// The reaction text if the creator sent one
+  final String? reaction;
+
+  /// The url of the image if the creator sent one
+  final String? imageUrl;
 
   /// Reaction creation date.
   final DateTime createdAt;

packages/flutter_timeline_interface/lib/src/services/timeline_service.dart

@@ -0,0 +1,17 @@
+import 'dart:typed_data';
+
+import 'package:flutter_timeline_interface/src/model/timeline_post.dart';
+import 'package:flutter_timeline_interface/src/model/timeline_reaction.dart';
+
+abstract class TimelineService {
+  Future<void> deletePost(TimelinePost post);
+  Future<void> createPost(TimelinePost post);
+  Future<List<TimelinePost>> fetchPosts(String? category);
+  Future<TimelinePost> fetchPostDetails(TimelinePost post);
+  Future<void> reactToPost(
+    TimelinePost post,
+    TimelinePostReaction reaction, {
+    Uint8List image,
+  });
+  Future<void> likePost(TimelinePost post);
+}

packages/flutter_timeline_interface/lib/src/services/user_service.dart

@@ -0,0 +1,5 @@
+import 'package:flutter_timeline_interface/src/model/timeline_poster.dart';
+
+mixin TimelineUserService {
+  Future<TimelinePosterUserModel?> getUser(String userId);
+}

packages/flutter_timeline_view/lib/src/screens/timeline_post_screen.dart

@@ -155,9 +155,10 @@ class TimelinePostScreen extends StatelessWidget {
                         ),
                       ],
                       const SizedBox(width: 10),
+                      // TODO(anyone): show image if the user send one
                       Expanded(
                         child: Text(
-                          reaction.reaction,
+                          reaction.reaction ?? '',
                           style: theme.textTheme.bodyMedium,
                           // text should go to new line
                           softWrap: true,