import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:health_app/core/app_theme.dart';
import 'package:health_app/core/elder_mode_scope.dart';
import 'package:health_app/pages/settings/elder_mode_page.dart';
import 'package:health_app/providers/elder_mode_provider.dart';

class _FakeElderModeNotifier extends ElderModeNotifier {
  final bool initiallyEnabled;

  _FakeElderModeNotifier(this.initiallyEnabled);

  @override
  ElderModeState build() => ElderModeState(
    preferences: ElderModePreferences(enabled: initiallyEnabled),
    isLoaded: true,
  );

  @override
  Future<bool> enable() async {
    state = state.copyWith(
      preferences: state.preferences.copyWith(enabled: true),
    );
    return true;
  }

  @override
  Future<bool> disable() async {
    state = state.copyWith(
      preferences: state.preferences.copyWith(enabled: false),
    );
    return true;
  }

  @override
  Future<bool> setLargeTextEnabled(bool enabled) async {
    state = state.copyWith(
      preferences: state.preferences.copyWith(largeTextEnabled: enabled),
    );
    return true;
  }

  @override
  Future<bool> setVoiceInputEnabled(bool enabled) async {
    state = state.copyWith(
      preferences: state.preferences.copyWith(voiceInputEnabled: enabled),
    );
    return true;
  }
}

class _ElderModeHarness extends ConsumerWidget {
  const _ElderModeHarness();

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final state = ref.watch(elderModeProvider);
    final baseTheme = state.isEnabled
        ? AppTheme.elderLightTheme
        : AppTheme.lightTheme;
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: baseTheme,
      home: ElderModeScope(
        enabled: state.isEnabled,
        largeTextEnabled: state.isEnabled && state.preferences.largeTextEnabled,
        child: const ElderModePage(),
      ),
    );
  }
}

Future<void> _pumpPage(WidgetTester tester, {required bool enabled}) async {
  tester.view.physicalSize = const Size(390, 844);
  tester.view.devicePixelRatio = 1;
  addTearDown(tester.view.resetPhysicalSize);
  addTearDown(tester.view.resetDevicePixelRatio);

  await tester.pumpWidget(
    ProviderScope(
      overrides: [
        elderModeProvider.overrideWith(() => _FakeElderModeNotifier(enabled)),
      ],
      child: const _ElderModeHarness(),
    ),
  );
  await tester.pumpAndSettle();
}

void main() {
  testWidgets('长辈模式可立即开启并显示已开启状态', (tester) async {
    await _pumpPage(tester, enabled: false);

    expect(find.text('开启长辈模式，操作更清晰'), findsOneWidget);
    expect(find.text('立即开启'), findsOneWidget);

    await tester.tap(find.text('立即开启'));
    await tester.pumpAndSettle();

    expect(find.text('长辈模式已开启'), findsOneWidget);
    expect(find.text('大图标和大按钮已启用'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });

  testWidgets('长辈模式页面在 390x844 下无布局溢出', (tester) async {
    await _pumpPage(tester, enabled: true);

    expect(find.text('关闭长辈模式'), findsOneWidget);
    expect(find.byType(Switch), findsNWidgets(2));
    expect(tester.takeException(), isNull);
  });
}