fanuzu/app/test/auth_line_test.dart

import 'package:cloud_functions/cloud_functions.dart';
import 'package:fancake/core/firebase/firebase_boot.dart';
import 'package:fancake/features/auth/auth.dart';
import 'package:fancake/features/auth/firebase_account_linker.dart';
import 'package:fancake/features/auth/social_providers.dart';
import 'package:firebase_auth_mocks/firebase_auth_mocks.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

/// LINE — SDK 로그인(주입) → 서버 교환(주입) → signInWithCustomToken 계약.
/// 토큰 검증·기존 oidc.line 사용자 매핑은 서버 테스트(functions/test/auth_line.test.ts)가 본다.
void main() {
  setUp(() => FirebaseBoot.debugSetMode(FirebaseMode.live, reason: 'LINE 테스트'));
  tearDown(
    () => FirebaseBoot.debugSetMode(FirebaseMode.mock, reason: 'LINE 테스트 끝'),
  );

  final sent = <Map<String, dynamic>>[];
  setUp(sent.clear);

  LineSignInProvider line(
    MockFirebaseAuth auth, {
    Future<LineTokens> Function()? login,
    Object? serverError,
    String channelId = '2000000001',
  }) => LineSignInProvider(
    login:
        login ?? () async => (idToken: 'line-id', accessToken: 'line-access'),
    exchange: (payload) async {
      sent.add(payload);
      if (serverError != null) throw serverError;
      return {
        'token': 'custom-token',
        if (payload['link'] == true) 'linked': true,
      };
    },
    firebaseAuth: auth,
    channelId: channelId,
  );

  test('성공 — LINE 토큰을 서버에 넘기고 커스텀 토큰으로 로그인한다', () async {
    final auth = MockFirebaseAuth(mockUser: MockUser(uid: 'line:U1'));
    final outcome = await line(auth).signIn();
    expect(sent.single, {'idToken': 'line-id', 'accessToken': 'line-access'});
    expect((outcome as AuthSucceeded).account.uid, 'line:U1');
    expect(outcome.account.provider, AuthProviderKind.line);
    expect(auth.currentUser?.uid, 'line:U1');
  });

  test('ID 토큰이 없으면(openid 미동의) 액세스 토큰만 넘긴다', () async {
    await line(
      MockFirebaseAuth(),
      login: () async => (idToken: null, accessToken: 'line-access'),
    ).signIn();
    expect(sent.single, {'accessToken': 'line-access'});
  });

  test('채널 ID 가 없으면 SDK·서버를 부르지 않고 미설정', () async {
    final outcome = await line(MockFirebaseAuth(), channelId: '').signIn();
    expect(outcome, isA<AuthNotConfigured>());
    expect(sent, isEmpty);
  });

  test(
    'LINE 로그인 취소(Android CANCEL · iOS 3003)는 취소 · 서버를 부르지 않는다 · 다시 시도하면 된다',
    () async {
      for (final code in ['CANCEL', '3003']) {
        final outcome = await line(
          MockFirebaseAuth(),
          login: () async => throw PlatformException(code: code),
        ).signIn();
        expect(outcome, isA<AuthCancelled>(), reason: code);
      }
      expect(sent, isEmpty);
      final retry = await line(
        MockFirebaseAuth(mockUser: MockUser(uid: 'line:U1')),
      ).signIn();
      expect(retry, isA<AuthSucceeded>());
    },
  );

  test('SDK 실패는 소셜 문구 E-AUTH-03', () async {
    final outcome = await line(
      MockFirebaseAuth(),
      login: () async =>
          throw PlatformException(code: 'AUTHENTICATION_AGENT_ERROR'),
    ).signIn();
    expect((outcome as AuthFailed).code, 'E-AUTH-03');
    expect(outcome.message, '소셜 로그인에 실패했습니다.');
    expect(sent, isEmpty);
  });

  test('서버 오류는 카탈로그 코드로 · 로그인하지 않는다', () async {
    final auth = MockFirebaseAuth();
    final outcome = await line(
      auth,
      serverError: FirebaseFunctionsException(
        code: 'permission-denied',
        message: 'LINE 인증을 확인하지 못했습니다.',
        details: {'code': 'E-AUTH-03'},
      ),
    ).signIn();
    expect((outcome as AuthFailed).code, 'E-AUTH-03');
    expect(outcome.message, '소셜 로그인에 실패했습니다.');
    expect(auth.currentUser, isNull);
  });

  group('SNS 연동', () {
    test('로그인한 사용자에 link: true 로 붙인다', () async {
      final auth = MockFirebaseAuth(
        signedIn: true,
        mockUser: MockUser(uid: 'u-1'),
      );
      final linker = FirebaseAccountLinker(
        providers: [line(auth)],
        firebaseAuth: auth,
      );
      final outcome = await linker.link(AuthProviderKind.line);
      expect(sent.single, {
        'idToken': 'line-id',
        'accessToken': 'line-access',
        'link': true,
      });
      expect((outcome as AuthSucceeded).account.uid, 'u-1');
    });

    test('연결 중 취소는 취소 · 서버를 부르지 않는다', () async {
      final auth = MockFirebaseAuth(
        signedIn: true,
        mockUser: MockUser(uid: 'u-1'),
      );
      final outcome = await line(
        auth,
        login: () async => throw PlatformException(code: 'CANCEL'),
      ).link(auth.currentUser!);
      expect(outcome, isA<AuthCancelled>());
      expect(sent, isEmpty);
    });

    test(
      '다른 계정에 붙은 LINE 이면 E-AUTH-08 · 이미 다른 LINE 이면 E-AUTH-09 · 세션 만료면 다시 로그인 안내',
      () async {
        final auth = MockFirebaseAuth(
          signedIn: true,
          mockUser: MockUser(uid: 'u-1'),
        );
        Future<AuthOutcome> failWith(Map<String, String> details) => line(
          auth,
          serverError: FirebaseFunctionsException(
            code: 'x',
            message: 'x',
            details: details,
          ),
        ).link(auth.currentUser!);

        final inUse = await failWith({'code': 'E-AUTH-08'});
        expect((inUse as AuthFailed).code, 'E-AUTH-08');
        expect(inUse.message, '다른 FANUZU 계정에 이미 연결된 소셜 계정입니다.');
        expect(
          ((await failWith({'code': 'E-AUTH-09'})) as AuthFailed).code,
          'E-AUTH-09',
        );
        final expired = await failWith({
          'code': 'E-AUTH-03',
          'reason': 'session',
        });
        expect((expired as AuthFailed).message, '보안을 위해 다시 로그인한 뒤 시도해 주세요.');
      },
    );
  });
}