import 'dart:typed_data';

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

import '../../../common/network/dio_provider.dart';
import '../../../common/network/protobuf_wire_reader.dart';

class AppMallAuthToken {
  const AppMallAuthToken({
    required this.authToken,
    required this.expiresIn,
    required this.sourceApp,
    required this.scene,
  });

  final String authToken;
  final int expiresIn;
  final String sourceApp;
  final String scene;
}

class MallAuthApi {
  const MallAuthApi(this._dio);
  final Dio _dio;

  Future<AppMallAuthToken> issueAppMallAuthToken() async {
    final response = await _dio.post<List<int>>(
      '/api/v1/auth/mall/app-token',
      // Dio serializes a List<int> as the UTF-8 text "[]". This endpoint
      // expects an empty protobuf message, whose wire representation is zero
      // bytes; Uint8List keeps the request body binary and untransformed.
      data: Uint8List(0),
      options: protobufOptions(),
    );
    final reply = ProtobufWireMessage(response.data ?? const <int>[]);
    final token = reply.string(1).trim();
    final expiresIn = reply.integer(2);
    final sourceApp = reply.string(3).trim();
    final scene = reply.string(4).trim();
    if (token.isEmpty || expiresIn <= 0 || sourceApp.isEmpty || scene.isEmpty) {
      throw const FormatException('Incomplete mall auth token response');
    }
    return AppMallAuthToken(
      authToken: token,
      expiresIn: expiresIn,
      sourceApp: sourceApp,
      scene: scene,
    );
  }
}

final mallAuthApiProvider = Provider(
  (ref) => MallAuthApi(ref.watch(dioProvider)),
);