import 'dart:developer' as developer;

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

import '../auth/auth_provider.dart';
import '../config/app_config.dart';
import '../error/app_exception.dart';

/// Adds authentication token to requests.
///
/// Skipped entirely when [AppConfig.requiresAuth] is false (LAN development).
class AuthInterceptor extends Interceptor {
  AuthInterceptor(this._ref);

  final Ref _ref;

  @override
  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
    // Skip auth for LAN development
    if (!AppConfig.requiresAuth) {
      handler.next(options);
      return;
    }

    final authState = _ref.read(authNotifierProvider);

    authState.whenData((auth) {
      if (auth.isAuthenticated && auth.accessToken != null) {
        options.headers['Authorization'] = 'Bearer ${auth.accessToken}';
      }
    });

    handler.next(options);
  }

  @override
  void onError(DioException err, ErrorInterceptorHandler handler) {
    // Skip auth error handling for LAN development
    if (!AppConfig.requiresAuth) {
      handler.next(err);
      return;
    }

    if (err.response?.statusCode == 401) {
      // Token expired - trigger re-authentication
      _ref.read(authNotifierProvider.notifier).signOut();
    }
    handler.next(err);
  }
}

/// Logs requests and responses in debug mode.
class LoggingInterceptor extends Interceptor {
  @override
  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
    developer.log(
      '→ ${options.method} ${options.uri}',
      name: 'api',
    );
    handler.next(options);
  }

  @override
  void onResponse(Response response, ResponseInterceptorHandler handler) {
    developer.log(
      '← ${response.statusCode} ${response.requestOptions.uri}',
      name: 'api',
    );
    handler.next(response);
  }

  @override
  void onError(DioException err, ErrorInterceptorHandler handler) {
    developer.log(
      '✗ ${err.response?.statusCode ?? 'NETWORK'} ${err.requestOptions.uri}: ${err.message}',
      name: 'api',
      error: err,
    );
    handler.next(err);
  }
}

/// Converts Dio errors to AppException types.
class ErrorInterceptor extends Interceptor {
  @override
  void onError(DioException err, ErrorInterceptorHandler handler) {
    final exception = _mapToAppException(err);
    handler.reject(
      DioException(
        requestOptions: err.requestOptions,
        response: err.response,
        type: err.type,
        error: exception,
      ),
    );
  }

  AppException _mapToAppException(DioException err) {
    switch (err.type) {
      case DioExceptionType.connectionTimeout:
      case DioExceptionType.sendTimeout:
      case DioExceptionType.receiveTimeout:
        return NetworkException(
          message: 'Connection timed out',
          cause: err,
        );

      case DioExceptionType.connectionError:
        return NetworkException(
          message: 'Unable to connect to server',
          cause: err,
        );

      case DioExceptionType.badResponse:
        final statusCode = err.response?.statusCode ?? 0;
        final data = err.response?.data;

        String message = 'Request failed';
        String? code;

        if (data is Map<String, dynamic>) {
          final error = data['error'];
          if (error is Map<String, dynamic>) {
            message = error['message'] as String? ?? message;
            code = error['code'] as String?;
          } else if (error is String) {
            message = error;
          }
        }

        return ApiException(
          message: message,
          statusCode: statusCode,
          code: code,
          cause: err,
        );

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

      case DioExceptionType.badCertificate:
        return const NetworkException(message: 'Invalid SSL certificate');

      case DioExceptionType.unknown:
        return NetworkException(
          message: err.message ?? 'Unknown error',
          cause: err,
        );
    }
  }
}