Create Chat class + tests

lib/models/chat.dart

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+import 'package:auto_gpt_flutter_client/models/message_type.dart';
+
+/// Represents a chat message related to a specific task.
+class Chat {
+  final int id;
+  final int taskId;
+  final String message;
+  final DateTime timestamp;
+  final MessageType messageType;
+
+  Chat({
+    required this.id,
+    required this.taskId,
+    required this.message,
+    required this.timestamp,
+    required this.messageType,
+  });
+
+  // Convert a Map (usually from JSON) to a Chat object
+  factory Chat.fromMap(Map<String, dynamic> map) {
+    return Chat(
+      id: map['id'],
+      taskId: map['taskId'],
+      message: map['message'],
+      timestamp: DateTime.parse(map['timestamp']),
+      messageType: MessageType.values.firstWhere(
+          (e) => e.toString() == 'MessageType.${map['messageType']}'),
+    );
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is Chat &&
+          runtimeType == other.runtimeType &&
+          id == other.id &&
+          taskId == other.taskId &&
+          message == other.message &&
+          timestamp == other.timestamp &&
+          messageType == other.messageType;
+
+  @override
+  int get hashCode =>
+      id.hashCode ^
+      taskId.hashCode ^
+      message.hashCode ^
+      timestamp.hashCode ^
+      messageType.hashCode;
+
+  @override
+  String toString() =>
+      'Chat(id: $id, taskId: $taskId, message: $message, timestamp: $timestamp, messageType: $messageType)';
+}

lib/models/message_type.dart

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+/// Enum representing the type of the chat message.
+enum MessageType {
+  user,
+  agent,
+}

test/chat_test.dart

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+import 'package:auto_gpt_flutter_client/models/chat.dart';
+import 'package:auto_gpt_flutter_client/models/message_type.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Chat', () {
+    // Test the properties of the Chat class
+    test('Chat properties', () {
+      final chat = Chat(
+          id: 1,
+          taskId: 1,
+          message: 'Test Message',
+          timestamp: DateTime.now(),
+          messageType: MessageType.user);
+
+      expect(chat.id, 1);
+      expect(chat.taskId, 1);
+      expect(chat.message, 'Test Message');
+      expect(chat.messageType, MessageType.user);
+    });
+
+    // Test Chat.fromMap method
+    test('Chat.fromMap', () {
+      final chat = Chat.fromMap({
+        'id': 1,
+        'taskId': 1,
+        'message': 'Test Message',
+        'timestamp': DateTime.now().toString(),
+        'messageType': 'user'
+      });
+
+      expect(chat.id, 1);
+      expect(chat.taskId, 1);
+      expect(chat.message, 'Test Message');
+      expect(chat.messageType, MessageType.user);
+    });
+
+    // Test that two Chat objects with the same properties are equal
+    test('Two chats with same properties are equal', () {
+      final chat1 = Chat(
+          id: 3,
+          taskId: 3,
+          message: 'Same Message',
+          timestamp: DateTime.now(),
+          messageType: MessageType.agent);
+      final chat2 = Chat(
+          id: 3,
+          taskId: 3,
+          message: 'Same Message',
+          timestamp: chat1.timestamp,
+          messageType: MessageType.agent);
+
+      expect(chat1, chat2);
+    });
+
+    // Test that toString() returns a string representation of the Chat
+    test('toString returns string representation', () {
+      final chat = Chat(
+          id: 4,
+          taskId: 4,
+          message: 'Test toString',
+          timestamp: DateTime.now(),
+          messageType: MessageType.user);
+
+      expect(chat.toString(),
+          'Chat(id: 4, taskId: 4, message: Test toString, timestamp: ${chat.timestamp}, messageType: MessageType.user)');
+    });
+  });
+}