import 'dart:async';

import 'package:flutter_test/flutter_test.dart';

import 'package:sxchnge_auth/sxchnge_auth.dart';

class ControlledService implements LoginService, SignupService {
  final calls = <Completer<AuthResult>>[];
  LoginRequest? loginInput;
  SignupRequest? signupInput;
  Future<AuthResult> next() {
    final call = Completer<AuthResult>();
    calls.add(call);
    return call.future;
  }

  @override
  Future<AuthResult> login(LoginRequest request) {
    loginInput = request;
    return next();
  }

  @override
  Future<AuthResult> signup(SignupRequest request) {
    signupInput = request;
    return next();
  }
}

void main() {
  const result = AuthResult(userId: 'demo', isSimulated: true);
  for (final signup in [false, true]) {
    group(signup ? 'signup' : 'login', () {
      late ControlledService service;
      late AuthProvider provider;
      Future<void> submit() => signup
          ? (provider as SignupProvider).signup(
              name: ' Alex ',
              email: ' a@example.com ',
              password: ' secret ',
              locale: 'ru',
            )
          : (provider as LoginProvider).login(
              email: ' a@example.com ',
              password: ' secret ',
              locale: 'ru',
            );
      setUp(() {
        service = ControlledService();
        provider = signup ? SignupProvider(service) : LoginProvider(service);
      });
      test(
        'loading, duplicate suppression, result and normalized input',
        () async {
          final states = <AuthStatus>[];
          provider.addListener(() => states.add(provider.state.status));
          final first = submit();
          await submit();
          expect(service.calls, hasLength(1));
          expect(provider.state.isLoading, isTrue);
          if (signup) {
            expect(service.signupInput!.name, 'Alex');
            expect(service.signupInput!.email, 'a@example.com');
            expect(service.signupInput!.password, ' secret ');
            expect(service.signupInput!.locale, 'ru');
          } else {
            expect(service.loginInput!.email, 'a@example.com');
            expect(service.loginInput!.password, ' secret ');
            expect(service.loginInput!.locale, 'ru');
          }
          service.calls.single.complete(result);
          await first;
          expect(states, [AuthStatus.loading, AuthStatus.success]);
          expect(provider.state.result, same(result));
          provider.dispose();
        },
      );
      test('typed failure and retry clear previous error', () async {
        final first = submit();
        service.calls.last.completeError(
          const AuthException(AuthError.unavailable),
        );
        await first;
        expect(provider.state.error, AuthError.unavailable);
        final retry = submit();
        expect(provider.state.error, isNull);
        service.calls.last.complete(result);
        await retry;
        expect(provider.state.status, AuthStatus.success);
        provider.dispose();
      });
      test('unknown exceptions are sanitized', () async {
        final first = submit();
        service.calls.last.completeError(StateError('secret password'));
        await first;
        expect(provider.state.error, AuthError.unexpected);
        expect(provider.state.result, isNull);
        provider.dispose();
      });
      test('reset rejects stale completion during a new operation', () async {
        final first = submit();
        provider.reset();
        expect(provider.state.status, AuthStatus.idle);
        final second = submit();
        service.calls.first.complete(result);
        await first;
        expect(provider.state.status, AuthStatus.loading);
        service.calls.last.complete(result);
        await second;
        expect(provider.state.status, AuthStatus.success);
        provider.dispose();
      });
      test('dispose ignores late failures and further submissions', () async {
        var notifications = 0;
        provider.addListener(() => notifications++);
        final pending = submit();
        provider.dispose();
        service.calls.last.completeError(
          const AuthException(AuthError.unavailable),
        );
        await pending;
        await submit();
        expect(notifications, 1);
        expect(service.calls, hasLength(1));
      });
    });
  }
  test('dummy services simulate success and configured errors', () async {
    const login = LoginRequest(
      email: 'a@example.com',
      password: 'secret',
      locale: 'en',
    );
    const signup = SignupRequest(
      name: 'Alex',
      email: 'a@example.com',
      password: 'secret',
      locale: 'ru',
    );
    expect(
      (await const DummyLoginService(delay: Duration.zero).login(login))
          .isSimulated,
      isTrue,
    );
    final accepted = await const DummySignupService(delay: Duration.zero)
        .signup(signup);
    expect(accepted.isSimulated, isTrue);
    expect(accepted.delivery?.email, 'a@example.com');
    expect(accepted.delivery?.isSimulated, isTrue);
    await expectLater(
      const DummyLoginService(
        delay: Duration.zero,
        failure: AuthError.invalidCredentials,
      ).login(login),
      throwsA(
        isA<AuthException>().having(
          (e) => e.code,
          'code',
          AuthError.invalidCredentials,
        ),
      ),
    );
    await expectLater(
      const DummySignupService(
        delay: Duration.zero,
        failure: AuthError.emailInUse,
      ).signup(signup),
      throwsA(
        isA<AuthException>().having(
          (e) => e.code,
          'code',
          AuthError.emailInUse,
        ),
      ),
    );
  });
}