good framework for content models

lib/controllers/message_controller.dart

@@ -123,6 +123,7 @@ class MessageController extends AsyncNotifier<Message?> {
           text: "Unable to decrypt message.",
           metadata: {...metadata, "body": "Unable to decrypt message."},
         ),
+
         // "org.matrix.msc3381.poll.start" => Message.custom(
         //   metadata: {
         //     ...metadata,

lib/models/content/content.dart

@@ -0,0 +1,17 @@
+import "package:nexus/models/content/encrypted.dart";
+import "package:nexus/models/content/membership.dart";
+import "package:nexus/models/content/message.dart";
+
+class Content {
+  Content();
+  factory Content.fromJson(Map<String, dynamic> json) => Content();
+
+  Map<String, dynamic> toJson() => {};
+  static Content fromEventJson(Map<String, dynamic> eventJson) =>
+      switch (eventJson["type"]) {
+        EncryptedContent.type => EncryptedContent.fromJson,
+        MembershipContent.type => MembershipContent.fromJson,
+        MessageContent.type => MessageContent.fromJson,
+        _ => Content.fromJson,
+      }(eventJson);
+}

lib/models/content/encrypted.dart

@@ -0,0 +1,9 @@
+import "package:nexus/models/content/content.dart";
+
+class EncryptedContent extends Content {
+  EncryptedContent();
+  factory EncryptedContent.fromJson(Map<String, dynamic> json) =>
+      EncryptedContent();
+
+  static const type = "m.room.encrypted";
+}

lib/models/content/membership.dart

@@ -0,0 +1,21 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
+import "package:nexus/models/membership_status.dart";
+part "membership.freezed.dart";
+part "membership.g.dart";
+
+@freezed
+abstract class MembershipContent extends Content with _$MembershipContent {
+  static const type = "m.room.membership";
+
+  MembershipContent._();
+  const factory MembershipContent({
+    @JsonKey(name: "displayname") required String displayName,
+    required MembershipStatus membership,
+    required String? avatarUrl,
+    required String? reason,
+  }) = _MembershipContent;
+
+  factory MembershipContent.fromJson(Map<String, Object?> json) =>
+      _$MembershipContentFromJson(json);
+}

lib/models/content/message.dart

@@ -0,0 +1,16 @@
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
+import "package:nexus/models/membership_status.dart";
+part "message.freezed.dart";
+part "message.g.dart";
+
+@freezed
+abstract class MessageContent extends Content with _$MessageContent {
+  static const type = "m.room.message";
+
+  MessageContent._();
+  const factory MessageContent({required String msgtype}) = _MessageContent;
+
+  factory MessageContent.fromJson(Map<String, Object?> json) =>
+      _$MessageContentFromJson(json);
+}

lib/models/event.dart

@@ -1,5 +1,6 @@
 import "package:fast_immutable_collections/fast_immutable_collections.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
 import "package:nexus/models/epoch_date_time_converter.dart";
 part "event.freezed.dart";
 part "event.g.dart";
@@ -15,7 +16,6 @@ abstract class Event with _$Event {
     required String type,
     String? stateKey,
     @EpochDateTimeConverter() required DateTime timestamp,
-    required IMap<String, dynamic> content,
     IMap<String, dynamic>? decrypted,
     String? decryptedType,
     @Default(IMap.empty()) IMap<String, dynamic> unsigned,
@@ -29,6 +29,7 @@ abstract class Event with _$Event {
     @Default(IMap.empty()) IMap<String, int> reactions,
     @JsonKey(name: "last_edit_rowid") int? lastEditRowId,
     @UnreadTypeConverter() UnreadType? unreadType,
+    @JsonKey(fromJson: Content.fromJson) required Content content,
   }) = _Event;
 
   factory Event.fromJson(Map<String, Object?> json) => _$EventFromJson(json);