import 'package:dio/dio.dart';
import '../config/api_config.dart';
import '../models/session.dart';
import '../models/message.dart';

class ApiService {
  late final Dio _dio;
  String? _token;

  ApiService() {
    _dio = Dio(BaseOptions(
      baseUrl: ApiConfig.baseUrl,
      connectTimeout: ApiConfig.connectionTimeout,
      receiveTimeout: ApiConfig.receiveTimeout,
      headers: {
        'Content-Type': 'application/json',
      },
    ));

    _dio.interceptors.add(InterceptorsWrapper(
      onRequest: (options, handler) {
        if (_token != null) {
          options.headers['Authorization'] = 'Bearer $_token';
        }
        return handler.next(options);
      },
      onError: (error, handler) {
        if (error.response?.statusCode == 401) {
          // Token expired, trigger re-login
        }
        return handler.next(error);
      },
    ));
  }

  void setToken(String? token) {
    _token = token;
  }

  Future<Map<String, dynamic>> login(String username, String password) async {
    final response = await _dio.post(
      ApiConfig.login,
      data: {
        'username': username,
        'password': password,
      },
    );
    return response.data;
  }

  Future<List<ScreenSession>> getSessions() async {
    final response = await _dio.get(ApiConfig.sessions);
    return (response.data as List)
        .map((json) => ScreenSession.fromJson(json))
        .toList();
  }

  Future<List<Conversation>> getHistory({int limit = 20}) async {
    final response = await _dio.get(
      ApiConfig.history,
      queryParameters: {'limit': limit},
    );
    return (response.data as List)
        .map((json) => Conversation.fromJson(json))
        .toList();
  }

  Future<List<Message>> getConversationMessages(String conversationId) async {
    final response = await _dio.get('${ApiConfig.history}/$conversationId');
    return (response.data as List)
        .map((json) => Message.fromJson(json))
        .toList();
  }

  Future<Map<String, dynamic>> uploadFile(String filePath) async {
    final formData = FormData.fromMap({
      'file': await MultipartFile.fromFile(filePath),
    });
    final response = await _dio.post(ApiConfig.upload, data: formData);
    return response.data;
  }
}