import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';
import 'package:patbond_flutter/core/widgets/like_button.dart';

/// 宿主：模拟持有方（controller）的状态翻转——点按经 [onTap] 乐观翻转，
/// 外部（回滚/对账）经 [setActive] 直接改。
class _Host extends StatefulWidget {
  const _Host({required this.initialActive, required this.initialCount});

  final bool initialActive;
  final int initialCount;

  @override
  State<_Host> createState() => _HostState();
}

class _HostState extends State<_Host> {
  late bool active = widget.initialActive;
  late int count = widget.initialCount;

  void setExternal({required bool active, required int count}) {
    setState(() {
      this.active = active;
      this.count = count;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: buildAppTheme(),
      home: Scaffold(
        body: Center(
          child: LikeButton(
            variant: LikeButtonVariant.like,
            active: active,
            count: count,
            onPressed: () => setState(() {
              active = !active;
              count += active ? 1 : -1;
            }),
            semanticLabel: '点赞',
          ),
        ),
      ),
    );
  }
}

void main() {
  double scaleOf(WidgetTester tester) => tester
      .widget<ScaleTransition>(
        find.descendant(
          of: find.byType(LikeButton),
          matching: find.byType(ScaleTransition),
        ),
      )
      .scale
      .value;

  testWidgets('点按激活：240ms 弹性缩放动画（中途 >1，播完归位）', (tester) async {
    await tester.pumpWidget(const _Host(initialActive: false, initialCount: 6));

    await tester.tap(find.byIcon(Icons.favorite_border));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 90));
    expect(scaleOf(tester), greaterThan(1.0));
    expect(find.byIcon(Icons.favorite), findsOneWidget);
    expect(find.text('7'), findsOneWidget);

    await tester.pumpAndSettle();
    expect(scaleOf(tester), 1.0);
  });

  testWidgets('点按取消：仅颜色切换，无缩放动画', (tester) async {
    await tester.pumpWidget(const _Host(initialActive: true, initialCount: 7));

    await tester.tap(find.byIcon(Icons.favorite));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 90));
    expect(scaleOf(tester), 1.0);
    expect(find.byIcon(Icons.favorite_border), findsOneWidget);
    expect(find.text('6'), findsOneWidget);
    await tester.pumpAndSettle();
  });

  testWidgets('外部回滚：零动画直接跳变，计数与状态成对恢复', (tester) async {
    await tester.pumpWidget(const _Host(initialActive: false, initialCount: 6));

    // 点按激活并播完动画（在途请求随后失败的场景）。
    await tester.tap(find.byIcon(Icons.favorite_border));
    await tester.pumpAndSettle();
    expect(find.byIcon(Icons.favorite), findsOneWidget);

    // 外部（非点按）回滚：下一帧即恢复，无过渡动画。
    tester
        .state<_HostState>(find.byType(_Host))
        .setExternal(active: false, count: 6);
    await tester.pump();
    expect(find.byIcon(Icons.favorite_border), findsOneWidget);
    expect(find.text('6'), findsOneWidget);
    expect(scaleOf(tester), 1.0);
  });

  testWidgets('激活动画未播完时回滚：等播完再成对跳变（§4.3a 抖动抑制）', (tester) async {
    await tester.pumpWidget(const _Host(initialActive: false, initialCount: 6));

    await tester.tap(find.byIcon(Icons.favorite_border));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 60));
    expect(find.byIcon(Icons.favorite), findsOneWidget);

    // 动画中途回滚：本帧仍显示激活视觉（等待播完），计数同持。
    tester
        .state<_HostState>(find.byType(_Host))
        .setExternal(active: false, count: 6);
    await tester.pump();
    expect(find.byIcon(Icons.favorite), findsOneWidget);
    expect(find.text('7'), findsOneWidget);

    // 播完后成对跳回。
    await tester.pumpAndSettle();
    expect(find.byIcon(Icons.favorite_border), findsOneWidget);
    expect(find.text('6'), findsOneWidget);
  });

  testWidgets('对账静默：状态不变的计数变化直接替换，无动画', (tester) async {
    await tester.pumpWidget(const _Host(initialActive: true, initialCount: 7));

    tester
        .state<_HostState>(find.byType(_Host))
        .setExternal(active: true, count: 9);
    await tester.pump();
    expect(find.text('9'), findsOneWidget);
    expect(scaleOf(tester), 1.0);
  });

  testWidgets('onPressed 为 null 时禁用但照常渲染激活态', (tester) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: const Scaffold(
          body: LikeButton(
            variant: LikeButtonVariant.bookmark,
            active: true,
            count: 2,
          ),
        ),
      ),
    );
    expect(find.byIcon(Icons.bookmark), findsOneWidget);
    expect(find.text('2'), findsOneWidget);
  });
}