// Author: fruit.com.cn

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/core/data/models/home_feed.dart';
import 'package:fruitshorts/core/theme/app_colors.dart';
import 'package:fruitshorts/l10n/app_localizations.dart';
import 'package:fruitshorts/pages/recommend/widgets/home_hero_carousel.dart';

const List<FeedBanner> _banners = [
  FeedBanner(id: '1', imageUrl: 'https://cdn.test/a.png'),
  FeedBanner(id: '2', imageUrl: 'https://cdn.test/b.png'),
];

Widget _harness(List<FeedBanner> banners) {
  return MaterialApp(
    locale: const Locale('en'),
    supportedLocales: AppLocalizations.supportedLocales,
    localizationsDelegates: AppLocalizations.localizationsDelegates,
    home: Scaffold(
      body: HomeHeroCarousel(
        banners: banners,
        dramaFor: (_) => null,
        onWatch: (_) {},
      ),
    ),
  );
}

Color? _dotColor(WidgetTester tester, int index) {
  final decoration =
      tester
              .widget<Container>(find.byKey(Key('home-hero-dot-$index')))
              .decoration
          as BoxDecoration?;
  return decoration?.color;
}

void main() {
  testWidgets('should_keep_looping_backwards_from_the_first_banner', (
    tester,
  ) async {
    await tester.pumpWidget(_harness(_banners));
    await tester.pumpAndSettle();

    expect(_dotColor(tester, 0), AppColors.brandRed);

    // 从第一张往右滑：无缝轮播应该接到最后一张，而不是被边界挡住。
    await tester.fling(find.byType(PageView), const Offset(700, 0), 1200);
    await tester.pumpAndSettle();

    expect(_dotColor(tester, 1), AppColors.brandRed);
    expect(_dotColor(tester, 0), isNot(AppColors.brandRed));
  });

  testWidgets('should_wrap_to_first_banner_after_last_auto_advance', (
    tester,
  ) async {
    await tester.pumpWidget(_harness(_banners));
    await tester.pumpAndSettle();

    // 自动播两次：第 2 张之后应回到第 1 张，且页码继续往前走不回头。
    await tester.pump(const Duration(milliseconds: 4600));
    await tester.pumpAndSettle();
    expect(_dotColor(tester, 1), AppColors.brandRed);

    await tester.pump(const Duration(milliseconds: 4600));
    await tester.pumpAndSettle();
    expect(_dotColor(tester, 0), AppColors.brandRed);
  });

  testWidgets('should_not_loop_when_only_one_banner', (tester) async {
    await tester.pumpWidget(
      _harness(const [FeedBanner(id: '1', imageUrl: 'https://cdn.test/a.png')]),
    );
    await tester.pumpAndSettle();

    expect(find.byKey(const Key('home-hero-dot-0')), findsNothing);
    await tester.pump(const Duration(milliseconds: 6000));
    await tester.pumpAndSettle();
    expect(tester.takeException(), isNull);
  });
}