Initial commit

lib/models/message.dart

@@ -0,0 +1,59 @@
+enum MessageType { text, markdown, image, loading }
+
+enum MessageSender { user, ai }
+
+class ChatMessage {
+  final String id;
+  final String content;
+  final MessageType type;
+  final MessageSender sender;
+  final DateTime timestamp;
+  final List<String>? imageUrls;
+
+  const ChatMessage({
+    required this.id,
+    required this.content,
+    required this.type,
+    required this.sender,
+    required this.timestamp,
+    this.imageUrls,
+  });
+
+  ChatMessage copyWith({
+    String? id,
+    String? content,
+    MessageType? type,
+    MessageSender? sender,
+    DateTime? timestamp,
+    List<String>? imageUrls,
+  }) {
+    return ChatMessage(
+      id: id ?? this.id,
+      content: content ?? this.content,
+      type: type ?? this.type,
+      sender: sender ?? this.sender,
+      timestamp: timestamp ?? this.timestamp,
+      imageUrls: imageUrls ?? this.imageUrls,
+    );
+  }
+
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'content': content,
+        'type': type.name,
+        'sender': sender.name,
+        'timestamp': timestamp.toIso8601String(),
+        'imageUrls': imageUrls,
+      };
+
+  factory ChatMessage.fromJson(Map<String, dynamic> json) => ChatMessage(
+        id: json['id'] ?? '',
+        content: json['content'] ?? '',
+        type: MessageType.values.byName(json['type'] ?? 'text'),
+        sender: MessageSender.values.byName(json['sender'] ?? 'user'),
+        timestamp: DateTime.tryParse(json['timestamp'] ?? '') ?? DateTime.now(),
+        imageUrls: json['imageUrls'] != null
+            ? List<String>.from(json['imageUrls'])
+            : null,
+      );
+}