import 'package:dio/dio.dart';
import 'package:focusflow_shared/focusflow_shared.dart';
import 'interceptors/auth_interceptor.dart';

/// Central Dio wrapper for all API communication.
///
/// Registered as a lazy singleton in GetIt so every feature shares
/// the same HTTP client (and therefore the same auth interceptor,
/// retry logic, and error normalisation).
class ApiClient {
  late final Dio _dio;

  ApiClient() {
    _dio = Dio(
      BaseOptions(
        // TODO: read from env / config
        baseUrl: 'https://api.focusflow.app',
        connectTimeout: const Duration(seconds: 15),
        receiveTimeout: const Duration(seconds: 15),
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
        },
      ),
    );

    _dio.interceptors.addAll([
      AuthInterceptor(),
      LogInterceptor(requestBody: true, responseBody: true),
    ]);
  }

  // ── Convenience HTTP verbs ───────────────────────────────────────

  Future<Response<T>> get<T>(
    String path, {
    Map<String, dynamic>? queryParameters,
    Options? options,
  }) =>
      _dio.get<T>(path, queryParameters: queryParameters, options: options);

  Future<Response<T>> post<T>(
    String path, {
    Object? data,
    Options? options,
  }) =>
      _dio.post<T>(path, data: data, options: options);

  Future<Response<T>> put<T>(
    String path, {
    Object? data,
    Options? options,
  }) =>
      _dio.put<T>(path, data: data, options: options);

  Future<Response<T>> patch<T>(
    String path, {
    Object? data,
    Options? options,
  }) =>
      _dio.patch<T>(path, data: data, options: options);

  Future<Response<T>> delete<T>(
    String path, {
    Object? data,
    Options? options,
  }) =>
      _dio.delete<T>(path, data: data, options: options);

  // ── Auth helpers ─────────────────────────────────────────────────

  Future<ApiResponse<Map<String, dynamic>>> login(String email, String password) async {
    final response = await post<Map<String, dynamic>>(
      ApiConstants.authLogin,
      data: {'email': email, 'password': password},
    );
    return ApiResponse.fromJson(
      response.data!,
      (json) => json as Map<String, dynamic>,
    );
  }

  Future<ApiResponse<Map<String, dynamic>>> register(
    String displayName,
    String email,
    String password,
  ) async {
    final response = await post<Map<String, dynamic>>(
      ApiConstants.authRegister,
      data: {
        'displayName': displayName,
        'email': email,
        'password': password,
      },
    );
    return ApiResponse.fromJson(
      response.data!,
      (json) => json as Map<String, dynamic>,
    );
  }

  Future<void> logout() => post(ApiConstants.authLogout);

  // ── Task helpers ─────────────────────────────────────────────────

  Future<Response<Map<String, dynamic>>> fetchTasks({
    int page = 1,
    int limit = 20,
  }) =>
      get<Map<String, dynamic>>(
        ApiConstants.tasks,
        queryParameters: {'page': page, 'limit': limit},
      );

  Future<Response<Map<String, dynamic>>> fetchNextTask() =>
      get<Map<String, dynamic>>(ApiConstants.nextTask);

  Future<Response<Map<String, dynamic>>> completeTask(String id) =>
      post<Map<String, dynamic>>(ApiConstants.completeTask(id));

  Future<Response<Map<String, dynamic>>> skipTask(String id) =>
      post<Map<String, dynamic>>(ApiConstants.skipTask(id));

  Future<Response<Map<String, dynamic>>> createTask(Map<String, dynamic> data) =>
      post<Map<String, dynamic>>(ApiConstants.tasks, data: data);

  Future<Response<Map<String, dynamic>>> deleteTask(String id) =>
      delete<Map<String, dynamic>>(ApiConstants.task(id));

  // ── Streak helpers ───────────────────────────────────────────────

  Future<Response<Map<String, dynamic>>> fetchStreaks() =>
      get<Map<String, dynamic>>(ApiConstants.streaks);

  Future<Response<Map<String, dynamic>>> completeStreak(String id) =>
      post<Map<String, dynamic>>(ApiConstants.streak(id));

  Future<Response<Map<String, dynamic>>> forgiveStreak(String id) =>
      post<Map<String, dynamic>>(ApiConstants.forgiveStreak(id));

  // ── Reward helpers ───────────────────────────────────────────────

  Future<Response<Map<String, dynamic>>> generateReward(String taskId) =>
      post<Map<String, dynamic>>(
        ApiConstants.generateReward,
        data: {'taskId': taskId},
      );

  // ── Time helpers ─────────────────────────────────────────────────

  Future<Response<Map<String, dynamic>>> fetchTimeAccuracy() =>
      get<Map<String, dynamic>>(ApiConstants.timeAccuracy);
}