import 'package:trainhub_flutter/domain/entities/chat_session.dart';
import 'package:trainhub_flutter/domain/entities/chat_message.dart';

abstract class ChatRepository {
  Future<List<ChatSessionEntity>> getAllSessions();
  Future<ChatSessionEntity?> getSession(String id);
  Future<ChatSessionEntity> createSession();
  Future<void> deleteSession(String id);
  Future<List<ChatMessageEntity>> getMessages(String sessionId);
  Future<ChatMessageEntity> addMessage({
    required String sessionId,
    required String role,
    required String content,
  });
  Future<void> updateSessionTitle(String sessionId, String title);
}