/// Auth API Service
library;

import 'package:dio/dio.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../core/constants/api_constants.dart';
import '../../../domain/entities/user.dart';
import 'api_service.dart';

/// Auth API response models
class LoginResponse {
  final String accessToken;
  final String refreshToken;
  final int expiresIn;
  final User user;

  LoginResponse({
    required this.accessToken,
    required this.refreshToken,
    required this.expiresIn,
    required this.user,
  });

  factory LoginResponse.fromJson(Map<String, dynamic> json) {
    return LoginResponse(
      accessToken: json['access_token'] as String,
      refreshToken: json['refresh_token'] as String,
      expiresIn: json['expires_in'] as int,
      user: User.fromJson(json['user'] as Map<String, dynamic>),
    );
  }
}

/// Extension on User for JSON serialization
extension UserJson on User {
  static User fromJson(Map<String, dynamic> json) {
    return User(
      id: json['id'] as String,
      email: json['email'] as String,
      username: json['username'] as String,
      displayName: json['display_name'] as String?,
      avatarUrl: json['avatar_url'] as String?,
      isPremium: json['is_premium'] as bool? ?? false,
      createdAt: DateTime.parse(json['created_at'] as String),
      updatedAt: DateTime.parse(json['updated_at'] as String),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'email': email,
      'username': username,
      if (displayName != null) 'display_name': displayName,
      if (avatarUrl != null) 'avatar_url': avatarUrl,
      'is_premium': isPremium,
      'created_at': createdAt.toIso8601String(),
      'updated_at': updatedAt.toIso8601String(),
    };
  }
}

/// Auth API Service
class AuthApiService {
  AuthApiService(this._dio);

  final Dio _dio;

  /// Login with email and password
  Future<LoginResponse> login(String email, String password) async {
    try {
      final response = await _dio.post(
        ApiConstants.login,
        data: {
          'email': email,
          'password': password,
        },
      );

      return LoginResponse.fromJson(response.data);
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Register a new user
  Future<LoginResponse> register({
    required String email,
    required String username,
    required String password,
    String? displayName,
  }) async {
    try {
      final response = await _dio.post(
        ApiConstants.register,
        data: {
          'email': email,
          'username': username,
          'password': password,
          if (displayName != null) 'display_name': displayName,
        },
      );

      return LoginResponse.fromJson(response.data);
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Refresh access token
  Future<Map<String, dynamic>> refreshToken(String refreshToken) async {
    try {
      final response = await _dio.post(
        ApiConstants.refresh,
        data: {'refresh_token': refreshToken},
      );

      return response.data;
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Get current user profile
  Future<User> getCurrentUser() async {
    try {
      final response = await _dio.get(ApiConstants.me);
      return UserJson.fromJson(response.data);
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Update user profile
  Future<User> updateProfile({
    String? displayName,
    String? avatarUrl,
  }) async {
    try {
      final response = await _dio.put(
        ApiConstants.me,
        data: {
          if (displayName != null) 'display_name': displayName,
          if (avatarUrl != null) 'avatar_url': avatarUrl,
        },
      );

      return UserJson.fromJson(response.data);
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  /// Logout
  Future<void> logout() async {
    try {
      await _dio.post(ApiConstants.logout);
    } on DioException catch (e) {
      throw _handleDioError(e);
    }
  }

  Exception _handleDioError(DioException error) {
    if (error.response != null) {
      final statusCode = error.response!.statusCode;
      final message = error.response!.data['detail'] as String? ??
          'An error occurred';

      return Exception('$statusCode: $message');
    } else if (error.type == DioExceptionType.connectionTimeout) {
      return const Exception('Connection timeout');
    } else if (error.type == DioExceptionType.receiveTimeout) {
      return const Exception('Receive timeout');
    } else {
      return Exception('Network error: ${error.message}');
    }
  }
}

/// Provider for Auth API Service
final authApiServiceProvider = Provider<AuthApiService>((ref) {
  final dio = ref.watch(apiServiceProvider);
  return AuthApiService(dio);
});