import 'package:dio/dio.dart';
import '../constants/app_constants.dart';
import '../errors/exceptions.dart';

/// API client for making HTTP requests using Dio
class ApiClient {
  late final Dio _dio;

  ApiClient() {
    _dio = Dio(
      BaseOptions(
        baseUrl: AppConstants.apiBaseUrl,
        connectTimeout: const Duration(milliseconds: AppConstants.connectionTimeout),
        receiveTimeout: const Duration(milliseconds: AppConstants.receiveTimeout),
        sendTimeout: const Duration(milliseconds: AppConstants.sendTimeout),
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
        },
      ),
    );

    // Add request/response interceptors for logging and error handling
    _dio.interceptors.add(
      InterceptorsWrapper(
        onRequest: (options, handler) {
          // Log request details in debug mode
          handler.next(options);
        },
        onResponse: (response, handler) {
          // Log response details in debug mode
          handler.next(response);
        },
        onError: (error, handler) {
          // Handle different types of errors
          _handleDioError(error);
          handler.next(error);
        },
      ),
    );
  }

  /// Make a GET request
  Future<Response<T>> get<T>(
    String path, {
    Map<String, dynamic>? queryParameters,
    Options? options,
    CancelToken? cancelToken,
  }) async {
    try {
      return await _dio.get<T>(
        path,
        queryParameters: queryParameters,
        options: options,
        cancelToken: cancelToken,
      );
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Make a POST request
  Future<Response<T>> post<T>(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
    CancelToken? cancelToken,
  }) async {
    try {
      return await _dio.post<T>(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
        cancelToken: cancelToken,
      );
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Make a PUT request
  Future<Response<T>> put<T>(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
    CancelToken? cancelToken,
  }) async {
    try {
      return await _dio.put<T>(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
        cancelToken: cancelToken,
      );
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Make a DELETE request
  Future<Response<T>> delete<T>(
    String path, {
    dynamic data,
    Map<String, dynamic>? queryParameters,
    Options? options,
    CancelToken? cancelToken,
  }) async {
    try {
      return await _dio.delete<T>(
        path,
        data: data,
        queryParameters: queryParameters,
        options: options,
        cancelToken: cancelToken,
      );
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Handle Dio errors and convert them to custom exceptions
  Exception _handleDioError(DioException error) {
    switch (error.type) {
      case DioExceptionType.connectionTimeout:
      case DioExceptionType.sendTimeout:
      case DioExceptionType.receiveTimeout:
        return const NetworkException('Connection timeout. Please check your internet connection.');

      case DioExceptionType.badResponse:
        final statusCode = error.response?.statusCode;
        final message = error.response?.data?['message'] ?? 'Server error occurred';

        if (statusCode != null) {
          if (statusCode >= 400 && statusCode < 500) {
            return ServerException('Client error: $message (Status: $statusCode)');
          } else if (statusCode >= 500) {
            return ServerException('Server error: $message (Status: $statusCode)');
          }
        }
        return ServerException('HTTP error: $message');

      case DioExceptionType.cancel:
        return const NetworkException('Request was cancelled');

      case DioExceptionType.connectionError:
        return const NetworkException('No internet connection. Please check your network settings.');

      case DioExceptionType.badCertificate:
        return const NetworkException('Certificate verification failed');

      case DioExceptionType.unknown:
      default:
        return ServerException('An unexpected error occurred: ${error.message}');
    }
  }

  /// Add authorization header
  void addAuthorizationHeader(String token) {
    _dio.options.headers['Authorization'] = 'Bearer $token';
  }

  /// Remove authorization header
  void removeAuthorizationHeader() {
    _dio.options.headers.remove('Authorization');
  }

  /// Update base URL (useful for different environments)
  void updateBaseUrl(String newBaseUrl) {
    _dio.options.baseUrl = newBaseUrl;
  }
}