import 'dart:io';

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:path_provider_platform_interface/path_provider_platform_interface.dart';
import 'package:plugin_platform_interface/plugin_platform_interface.dart';
import 'package:ikar/backend/api.dart';
import 'package:ikar/backend/modules/account.dart';
import 'package:ikar/core/protocol/opcode_map.dart';
import 'package:ikar/core/protocol/packet.dart';
import 'package:ikar/core/storage/app_database.dart';
import 'package:ikar/core/storage/token_storage.dart';
import 'package:shared_preferences/shared_preferences.dart';

class _Paths extends PathProviderPlatform with MockPlatformInterfaceMixin {
  _Paths(this.directory);
  final String directory;

  @override
  Future<String?> getApplicationSupportPath() async => directory;
}

class _Api extends Api {
  final requests = <(int, Map<dynamic, dynamic>)>[];
  final responses = <int, Map<dynamic, dynamic>>{};

  @override
  SessionState get state => SessionState.online;

  @override
  Stream<SessionState> get stateStream => const Stream.empty();

  @override
  Future<Packet> sendRequest(
    int opcode,
    Map<dynamic, dynamic> payload, {
    void Function()? beforeSend,
    bool silent = false,
  }) async {
    beforeSend?.call();
    requests.add((opcode, Map.of(payload)));
    return Packet(
      cmd: CmdType.ok,
      opcode: opcode,
      payload: responses[opcode] ?? <dynamic, dynamic>{},
    );
  }
}

const _profile = {
  'contact': {
    'id': 42,
    'names': <dynamic>[
      {'type': 'ONEME', 'firstName': 'New', 'lastName': 'User'},
    ],
  },
};

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  const secureChannel = MethodChannel(
    'plugins.it_nomads.com/flutter_secure_storage',
  );
  final secureValues = <String, String>{};
  late _Api api;
  late AccountModule account;

  setUp(() async {
    SharedPreferences.setMockInitialValues({});
    secureValues.clear();
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(secureChannel, (call) async {
          final args = call.arguments as Map;
          final key = args['key'] as String;
          switch (call.method) {
            case 'write':
              secureValues[key] = args['value'] as String;
              return null;
            case 'read':
              return secureValues[key];
            case 'delete':
              secureValues.remove(key);
              return null;
          }
          throw StateError('Unexpected storage method: ${call.method}');
        });
    final directory = Directory.systemTemp.createTempSync(
      'qlyra_registration_test_',
    );
    final originalPaths = PathProviderPlatform.instance;
    PathProviderPlatform.instance = _Paths(directory.path);
    addTearDown(() async {
      await AppDatabase.close();
      PathProviderPlatform.instance = originalPaths;
      directory.deleteSync(recursive: true);
      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
          .setMockMethodCallHandler(secureChannel, null);
    });
    await AppDatabase.init();
    api = _Api();
    addTearDown(api.dispose);
    account = AccountModule(api);
  });

  test(
    'new account: OTP, registration, first login and restored login',
    () async {
      api.responses[Opcode.auth] = {
        'tokenAttrs': {
          'REGISTER': {'token': 'temporary-registration-token'},
        },
      };
      final verified = await account.verifyCode('123456', 'sms-token');
      expect(verified.isRegistration, isTrue);
      expect(secureValues, isEmpty);
      expect(await TokenStorage.getActiveAccountId(), isNull);

      api.responses[Opcode.authConfirm] = {
        'userToken': 42,
        'profile': _profile,
        'tokenType': 'LOGIN',
        'token': 'registered-login-token',
      };
      final id = await account.completeRegistration(
        token: verified.registerToken!,
        firstName: 'New',
        lastName: 'User',
        photoId: 7,
      );
      expect(id, 42);
      expect(api.requests.last.$1, Opcode.authConfirm);
      expect(api.requests.last.$2, {
        'token': 'temporary-registration-token',
        'tokenType': 'REGISTER',
        'firstName': 'New',
        'lastName': 'User',
        'photoId': 7,
        'avatarType': 'PRESET_AVATAR',
      });
      expect(await TokenStorage.readActiveToken(), 'registered-login-token');
      expect((await AppDatabase.loadProfile(id))?.firstName, 'New');

      api.responses[Opcode.login] = {
        'profile': _profile,
        'token': 'rotated-login-token',
        'time': 1700000000000,
      };
      final loggedIn = await account.login(accountId: id);
      expect(loggedIn.profile.id, id);
      expect(account.isLoggedIn, isTrue);
      expect(
        api.requests.firstWhere((r) => r.$1 == Opcode.login).$2['token'],
        'registered-login-token',
      );
      expect(await TokenStorage.readActiveToken(), 'rotated-login-token');

      final restored = AccountModule(api);
      await restored.login();
      expect(
        api.requests.lastWhere((r) => r.$1 == Opcode.login).$2['token'],
        'rotated-login-token',
      );
      expect(restored.isLoggedIn, isTrue);
    },
  );

  test(
    'REGISTER token with account ID does not become an active session',
    () async {
      api.responses[Opcode.auth] = {
        'profile': _profile,
        'tokenAttrs': {
          'REGISTER': {'token': 'registration-only'},
        },
      };
      final result = await account.verifyCode('123456', 'sms-token');
      expect(result.isRegistration, isTrue);
      expect(secureValues, isEmpty);
      expect(await TokenStorage.getActiveAccountId(), isNull);
      expect(await AppDatabase.loadAllProfiles(), isEmpty);
    },
  );

  test('existing account still persists LOGIN token after OTP', () async {
    api.responses[Opcode.auth] = {
      'profile': _profile,
      'tokenAttrs': {
        'LOGIN': {'token': 'existing-login-token'},
      },
    };
    final result = await account.verifyCode('123456', 'sms-token');
    expect(result.isRegistration, isFalse);
    expect(await TokenStorage.readActiveToken(), 'existing-login-token');
    expect((await AppDatabase.loadProfile(42))?.firstName, 'New');
  });

  for (final invalidToken in [null, '', '   ', 123]) {
    test('registration rejects invalid login token: $invalidToken', () async {
      api.responses[Opcode.authConfirm] = {
        'profile': _profile,
        'tokenType': 'LOGIN',
        'token': invalidToken,
      };
      await expectLater(
        account.completeRegistration(token: 'register', firstName: 'New'),
        throwsFormatException,
      );
      expect(secureValues, isEmpty);
      expect(await TokenStorage.getActiveAccountId(), isNull);
      expect(await AppDatabase.loadAllProfiles(), isEmpty);
    });
  }

  test(
    'registration rejects a REGISTER token in the confirmation response',
    () async {
      api.responses[Opcode.authConfirm] = {
        'profile': _profile,
        'tokenType': 'REGISTER',
        'token': 'temporary',
      };
      await expectLater(
        account.completeRegistration(token: 'register', firstName: 'New'),
        throwsFormatException,
      );
      expect(secureValues, isEmpty);
      expect(await TokenStorage.getActiveAccountId(), isNull);
    },
  );

  test(
    'login rejects empty explicit and stored tokens before network request',
    () async {
      await expectLater(
        account.login(accountId: 42, token: ''),
        throwsStateError,
      );
      await TokenStorage.saveToken(' ', 42);
      await expectLater(account.login(accountId: 42), throwsStateError);
      expect(api.requests, isEmpty);
    },
  );

  test('resend requests a new OTP token from the server', () async {
    api.responses[Opcode.authRequest] = {'token': 'fresh-sms-token'};
    final result = await account.resendCode('+7 (999) 000-00-00');
    expect(result.token, 'fresh-sms-token');
    expect(api.requests.single.$1, Opcode.authRequest);
    expect(api.requests.single.$2, {
      'phone': '+79990000000',
      'type': 'RESEND',
      'language': 'ru',
    });
  });

  test('empty LOGIN token does not hide a valid registration token', () {
    final result = VerifyCodeResult(
      payload: {
        'tokenAttrs': {
          'LOGIN': {'token': ''},
          'REGISTER': {'token': 'registration-only'},
        },
      },
    );
    expect(result.loginToken, isNull);
    expect(result.isRegistration, isTrue);
  });
}