import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

import 'package:mobile/main.dart';
import 'package:mobile/widgets/grouped_list_section.dart';

/// 在导航栏内按标签定位，避免和页面标题的相同文字混淆。
Finder navLabel(String label) {
  return find.descendant(
    of: find.byType(NavigationBar),
    matching: find.text(label),
  );
}

/// 手机尺寸（400 × 800 dp），避免默认 800×600 掩盖溢出问题。
void usePhoneSurface(WidgetTester tester) {
  tester.view.physicalSize = const Size(400, 800);
  tester.view.devicePixelRatio = 1.0;
  addTearDown(tester.view.reset);
}

Future<void> pumpApp(WidgetTester tester) async {
  usePhoneSurface(tester);
  await tester.pumpWidget(const KiriMemoApp());
  await tester.pumpAndSettle();
}

void main() {
  testWidgets('底部导航提供学习 / 管理 / 统计 / 账户四个入口', (WidgetTester tester) async {
    await pumpApp(tester);

    expect(find.byType(NavigationBar), findsOneWidget);
    expect(find.byType(NavigationDestination), findsNWidgets(4));

    for (final String label in <String>['学习', '管理', '统计', '账户']) {
      expect(navLabel(label), findsOneWidget);
    }
  });

  testWidgets('Android 端使用水平滑入转场，而非预测式返回', (WidgetTester tester) async {
    await pumpApp(tester);

    final MaterialApp app = tester.widget<MaterialApp>(find.byType(MaterialApp));
    final PageTransitionsTheme transitions = app.theme!.pageTransitionsTheme;
    expect(
      transitions.builders[TargetPlatform.android],
      isA<FadeForwardsPageTransitionsBuilder>(),
    );
  });

  testWidgets('默认停留在学习页，点击其它入口会切换', (WidgetTester tester) async {
    await pumpApp(tester);

    NavigationBar bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
    expect(bar.selectedIndex, 0);

    await tester.tap(navLabel('统计'));
    await tester.pumpAndSettle();

    bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
    expect(bar.selectedIndex, 2);

    await tester.tap(navLabel('账户'));
    await tester.pumpAndSettle();

    bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
    expect(bar.selectedIndex, 3);
  });

  testWidgets('学习首页展示今日任务与唯一主行动', (WidgetTester tester) async {
    await pumpApp(tester);

    expect(find.text('今日计划'), findsOneWidget);
    expect(find.text('待复习'), findsOneWidget);
    expect(find.text('待新识'), findsOneWidget);
    expect(find.text('开始学习'), findsOneWidget);

    // 顶部状态标识：接力用闪电、同步用云图标，不再用文字表达状态。
    expect(find.byIcon(Icons.bolt_rounded), findsOneWidget);
    expect(find.text('今日记忆'), findsOneWidget);
    expect(find.text('59'), findsOneWidget);
    expect(find.byIcon(Icons.cloud_done_rounded), findsOneWidget);
    expect(find.byTooltip('搜索条目'), findsOneWidget);
    expect(find.byTooltip('学习日志'), findsOneWidget);

    // 学习域的四个快捷入口。
    for (final String label in <String>['收藏夹', '自我测试', '附带资料', '计划设置']) {
      expect(find.text(label), findsOneWidget);
    }
  });

  testWidgets('未接入内核的入口点击后给出反馈', (WidgetTester tester) async {
    await pumpApp(tester);

    await tester.tap(find.text('开始学习'));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 300));

    expect(find.text('学习会话 尚未接入内核'), findsOneWidget);
  });

  testWidgets('管理页有三个维度，各自列出卡片', (WidgetTester tester) async {
    await pumpApp(tester);
    await tester.tap(navLabel('管理'));
    await tester.pumpAndSettle();

    for (final String label in <String>['单元集', '计划', '算法']) {
      expect(find.text(label), findsOneWidget);
    }
    expect(find.text('高考必背古诗文'), findsOneWidget);
    expect(find.text('标识 cngk-t'), findsOneWidget);

    await tester.tap(find.text('计划'));
    await tester.pumpAndSettle();
    expect(find.text('每日计划'), findsOneWidget);
    expect(find.text('周末冲刺'), findsOneWidget);
    expect(find.text('新识记'), findsNWidgets(2));

    await tester.tap(find.text('算法'));
    await tester.pumpAndSettle();
    expect(find.text('NSP-0'), findsOneWidget);
    expect(find.text('默认'), findsOneWidget);
  });

  testWidgets('账户页展示资料、学习数据与四个功能入口', (WidgetTester tester) async {
    await pumpApp(tester);
    await tester.tap(navLabel('账户'));
    await tester.pumpAndSettle();

    expect(find.text('zhiyu'), findsOneWidget);
    expect(find.text('ID KM-1024 · 大一'), findsOneWidget);
    expect(find.text('累计学习'), findsOneWidget);
    expect(find.text('坚持'), findsOneWidget);

    // 四个入口是同一张分组卡片里的四行。
    expect(find.byType(GroupedListSection), findsOneWidget);
    expect(find.byType(GroupedListTile), findsNWidgets(4));

    for (final String label in <String>[
      '设置',
      '文档与帮助',
      '反馈问题',
      '关于 KiriMemo',
    ]) {
      expect(find.text(label), findsOneWidget);
    }
  });

  testWidgets('账户页可以进入设置页，设置项按分组排列', (WidgetTester tester) async {
    await pumpApp(tester);
    await tester.tap(navLabel('账户'));
    await tester.pumpAndSettle();

    await tester.tap(find.text('设置'));
    await tester.pumpAndSettle();

    expect(find.text('每日新识记上限'), findsOneWidget);
    expect(find.text('答错后重新排队'), findsOneWidget);

    // 分组在下方，需要滚动到可见。
    await tester.scrollUntilVisible(find.text('版本'), 200);
    expect(find.text('版本'), findsOneWidget);
    expect(find.text('1.0.0'), findsOneWidget);
  });

  testWidgets('关于页声明 AGPL-3.0 授权', (WidgetTester tester) async {
    await pumpApp(tester);
    await tester.tap(navLabel('账户'));
    await tester.pumpAndSettle();

    await tester.tap(find.text('关于 KiriMemo'));
    await tester.pumpAndSettle();

    expect(find.text('GNU AGPL v3.0'), findsOneWidget);
  });

  testWidgets('文档与帮助页底部有可上滑的助手', (WidgetTester tester) async {
    await pumpApp(tester);
    await tester.tap(navLabel('账户'));
    await tester.pumpAndSettle();

    await tester.tap(find.text('文档与帮助'));
    await tester.pumpAndSettle();

    expect(find.text('文档内容将在这里显示'), findsOneWidget);
    expect(find.text('问问 KiriMemo'), findsOneWidget);

    // 收起时是横栏，点开后出现输入框。
    expect(find.byType(TextField), findsNothing);
    await tester.tap(find.text('问问 KiriMemo'));
    await tester.pumpAndSettle();
    expect(find.byType(TextField), findsOneWidget);
  });
}