import 'dart:async';

import 'package:fancake/app.dart';
import 'package:fancake/core/firebase/firebase_boot.dart';
import 'package:fancake/features/auth/auth.dart';
import 'package:fancake/features/auth/auth_repository.dart';
import 'package:fancake/features/auth/login_screen.dart';
import 'package:fancake/features/auth/signup_screens.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

/// 가입 약관 — 동의 기록이 없는 계정은 HOME 대신 약관으로 가고, 동의를 기록한 뒤에만 HOME 에 들어간다.
/// 소셜 로그인 진행 중에는 화면 전체를 막고 진행 표시를 띄운다.
void main() {
  setUp(() {
    FirebaseBoot.debugSetMode(FirebaseMode.mock, reason: '가입 약관 위젯 테스트');
  });

  const newUser = AuthAccount(
    uid: 'new-user',
    provider: AuthProviderKind.kakao,
  );

  testWidgets('로그인 진행 중 로딩 · 중복 입력 막음 → 동의 없는 새 계정은 약관 → 필수 동의 → HOME', (
    tester,
  ) async {
    final signIn = Completer<AuthOutcome>();
    final provider = _Provider(AuthProviderKind.kakao, () => signIn.future);
    Set<String>? recorded;
    final auth = AuthRepository(
      providers: [provider],
      releaseMode: false,
      needsTerms: (_) async => recorded == null,
      recordTerms: (agreed) async => recorded = agreed,
    );
    await tester.pumpWidget(FancakeApp(auth: auth));
    await tester.pumpAndSettle();
    await tester.tap(find.widgetWithText(FilledButton, '로그인'));
    await tester.pumpAndSettle();

    final kakao = find.text(providerButtonLabel(AuthProviderKind.kakao));
    await tester.tap(kakao);
    await tester.pump();
    expect(find.byType(BlockingProgress), findsOneWidget);
    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    await tester.tap(kakao, warnIfMissed: false);
    await tester.pump();
    expect(provider.calls, 1);

    signIn.complete(const AuthSucceeded(newUser));
    await tester.pumpAndSettle();
    expect(find.byType(NavigationBar), findsNothing);
    expect(find.text('이용 약관'), findsOneWidget);
    expect(find.text('위치기반 서비스 이용약관 (필수)'), findsNothing);
    final done = find.widgetWithText(FilledButton, '완료');
    expect(tester.widget<FilledButton>(done).onPressed, isNull);
    for (final label in [
      '서비스 이용약관 (필수)',
      '개인정보 수집·이용 동의 (필수)',
      '만 14세 이상입니다. (필수)',
    ]) {
      await tester.scrollUntilVisible(find.text(label), 100);
      await tester.tap(find.text(label));
      await tester.pump();
    }
    // 개인정보처리방침은 체크 칸 없는 고지 · 보기 링크.
    final policy = find.byKey(const ValueKey('privacy-policy-link'));
    await tester.tap(policy);
    await tester.pumpAndSettle();
    expect(find.text('개인정보처리방침'), findsOneWidget);
    await tester.tap(find.text('확인'));
    await tester.pumpAndSettle();

    expect(tester.widget<FilledButton>(done).onPressed, isNotNull);
    await tester.tap(done);
    await tester.pumpAndSettle();

    expect(recorded, {'service', 'privacy', 'age'});
    expect(find.byType(NavigationBar), findsOneWidget);
    expect(find.byType(BlockingProgress), findsNothing);
  });

  testWidgets('개인정보처리방침 고지는 스크롤 없이 하단 버튼 위에 보이고 체크 칸이 없다', (tester) async {
    // iPhone 11 — 414x896pt · 상단 48 · 하단 34.
    tester.view.physicalSize = const Size(828, 1792);
    tester.view.devicePixelRatio = 2;
    tester.view.padding = const FakeViewPadding(top: 96, bottom: 68);
    addTearDown(tester.view.reset);
    await tester.pumpWidget(const MaterialApp(home: TermsScreen()));
    await tester.pumpAndSettle();

    final notice = find.byKey(const ValueKey('privacy-policy-notice'));
    expect(
      find.descendant(
        of: notice,
        matching: find.text('개인정보 처리 내용은 개인정보처리방침에서 확인할 수 있습니다.'),
      ),
      findsOneWidget,
    );
    final link = find.descendant(of: notice, matching: find.text('보기'));
    expect(link, findsOneWidget);
    expect(
      find.descendant(of: notice, matching: find.byType(ImageIcon)),
      findsNothing,
    );
    // 화면 안 · 「이전」 버튼 위.
    expect(tester.getRect(link).bottom, lessThanOrEqualTo(896 - 34));
    expect(
      tester.getRect(notice).bottom,
      lessThanOrEqualTo(
        tester.getRect(find.widgetWithText(FilledButton, '이전')).top,
      ),
    );

    await tester.tap(link);
    await tester.pumpAndSettle();
    expect(find.text('개인정보처리방침'), findsOneWidget);
  });

  testWidgets('개인정보처리방침 보기는 약관 문구가 아닌 처리방침 문구를 보여 준다', (tester) async {
    await tester.pumpWidget(const MaterialApp(home: TermsScreen()));
    await tester.pumpAndSettle();
    await tester.tap(find.byKey(const ValueKey('privacy-policy-link')));
    await tester.pumpAndSettle();

    final body = tester
        .widget<Text>(
          find.descendant(
            of: find.byType(AlertDialog),
            matching: find.textContaining('임시 문구'),
          ),
        )
        .data!;
    expect(body, contains('개인정보처리방침'));
    expect(body, isNot(contains('서비스 이용약관')));
  });

  testWidgets('이미 동의한 계정은 약관 없이 HOME', (tester) async {
    final auth = AuthRepository(
      providers: [
        _Provider(
          AuthProviderKind.google,
          () async => const AuthSucceeded(newUser),
        ),
      ],
      releaseMode: false,
      needsTerms: (_) async => false,
      recordTerms: (_) async => fail('기록하지 않는다'),
    );
    await tester.pumpWidget(FancakeApp(auth: auth));
    await tester.pumpAndSettle();
    await tester.tap(find.widgetWithText(FilledButton, '로그인'));
    await tester.pumpAndSettle();
    await tester.tap(find.text(providerButtonLabel(AuthProviderKind.google)));
    await tester.pumpAndSettle();
    expect(find.byType(NavigationBar), findsOneWidget);
  });

  testWidgets('가입 모드 — 인증 전에 받은 동의를 기록하고 약관을 다시 묻지 않는다', (tester) async {
    Set<String>? recorded;
    final auth = AuthRepository(
      providers: [
        _Provider(
          AuthProviderKind.line,
          () async => const AuthSucceeded(newUser),
        ),
      ],
      releaseMode: false,
      needsTerms: (_) async => recorded == null,
      recordTerms: (agreed) async => recorded = agreed,
    );
    await tester.pumpWidget(FancakeApp(auth: auth));
    await tester.pumpAndSettle();
    await tester.tap(find.text('회원가입'));
    await tester.pumpAndSettle();
    await tester.tap(
      find.text(providerButtonLabel(AuthProviderKind.line, signUp: true)),
    );
    await tester.pumpAndSettle();
    await tester.tap(find.text('전체 동의'));
    await tester.pump();
    await tester.tap(find.widgetWithText(FilledButton, '완료'));
    await tester.pumpAndSettle();

    expect(recorded, {'service', 'privacy', 'age', 'marketing'});
    expect(find.byType(NavigationBar), findsOneWidget);
  });
}

final class _Provider implements SocialAuthProvider {
  _Provider(this.provider, this._signIn);

  @override
  final AuthProviderKind provider;
  final Future<AuthOutcome> Function() _signIn;
  int calls = 0;

  @override
  bool get isLive => true;

  @override
  List<String> get missingConfig => const [];

  @override
  Future<AuthOutcome> signIn() {
    calls += 1;
    return _signIn();
  }

  @override
  Future<void> signOut() async {}
}