Refactor DashBot

lib/dashbot/models/chat_message.dart

@@ -0,0 +1,67 @@
+import 'package:flutter/foundation.dart';
+import '../constants.dart';
+import 'chat_action.dart';
+
+class ChatMessage {
+  final String id;
+  final String content;
+  final MessageRole role;
+  final DateTime timestamp;
+  final ChatMessageType? messageType;
+  // Multiple actions support. If provided, UI should render these.
+  final List<ChatAction>? actions;
+
+  const ChatMessage({
+    required this.id,
+    required this.content,
+    required this.role,
+    required this.timestamp,
+    this.messageType,
+    this.actions,
+  });
+
+  ChatMessage copyWith({
+    String? id,
+    String? content,
+    MessageRole? role,
+    DateTime? timestamp,
+    ChatMessageType? messageType,
+    List<ChatAction>? actions,
+  }) {
+    return ChatMessage(
+      id: id ?? this.id,
+      content: content ?? this.content,
+      role: role ?? this.role,
+      timestamp: timestamp ?? this.timestamp,
+      messageType: messageType ?? this.messageType,
+      actions: actions ?? this.actions,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'ChatMessage(id: $id, content: $content, role: $role, timestamp: $timestamp, messageType: $messageType, actions: $actions)';
+  }
+
+  @override
+  bool operator ==(covariant ChatMessage other) {
+    if (identical(this, other)) return true;
+
+    return other.id == id &&
+        other.content == content &&
+        other.role == role &&
+        other.timestamp == timestamp &&
+        other.messageType == messageType &&
+        listEquals(other.actions, actions);
+  }
+
+  @override
+  int get hashCode {
+    return id.hashCode ^
+        content.hashCode ^
+        role.hashCode ^
+        timestamp.hashCode ^
+        messageType.hashCode ^
+        actions.hashCode;
+  }
+}