import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:hepan_everyday/app/tp_startup.dart';
import 'package:hepan_everyday/app/tp_launch_page.dart';

void main() {
  testWidgets(
    'home paints before gradual reveal and cannot be tapped until complete',
    (tester) async {
      final ready = Completer<Widget>();
      var serviceStarts = 0, taps = 0, boots = 0;
      await tester.pumpWidget(
        TpStartup(
          bootstrap: () {
            boots++;
            expect(find.byType(TpLaunchPage), findsOneWidget);
            return ready.future;
          },
          onHomeReady: () {
            serviceStarts++;
            expect(find.text('课程详情'), findsOneWidget);
          },
        ),
      );
      ready.complete(
        MaterialApp(
          home: Center(
            child: TextButton(
              onPressed: () => taps++,
              child: const Text('课程详情'),
            ),
          ),
        ),
      );
      await tester.pump();
      await tester.pump();
      expect(serviceStarts, 1);
      await tester.pump(const Duration(milliseconds: 100));
      final overlay = tester.widget<Opacity>(
        find.byKey(const Key('startup-brand-overlay')),
      );
      expect(overlay.opacity, inExclusiveRange(0, 1));
      await tester.tap(find.text('课程详情'), warnIfMissed: false);
      expect(taps, 0);
      await tester.pumpAndSettle();
      expect(find.byType(TpLaunchPage), findsNothing);
      await tester.tap(find.text('课程详情'));
      expect(taps, 1);
      tester.binding.handleAppLifecycleStateChanged(AppLifecycleState.paused);
      tester.binding.handleAppLifecycleStateChanged(AppLifecycleState.resumed);
      await tester.pumpAndSettle();
      expect(boots, 1);
      expect(serviceStarts, 1);
      expect(find.byType(TpLaunchPage), findsNothing);
    },
  );

  testWidgets(
    'bootstrap failure presents a working retry instead of a blank screen',
    (tester) async {
      var attempts = 0;
      await tester.pumpWidget(
        TpStartup(
          bootstrap: () async {
            if (++attempts == 1) throw StateError('plugin unavailable');
            return const MaterialApp(home: Text('已恢复启动'));
          },
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('启动未完成，请重试'), findsOneWidget);
      expect(tester.takeException(), isNull);
      await tester.tap(find.text('重新打开'));
      await tester.pumpAndSettle();
      expect(find.text('已恢复启动'), findsOneWidget);
      expect(attempts, 2);
      expect(tester.takeException(), isNull);
    },
  );

  testWidgets('reduced motion reveals home without a timed fade', (
    tester,
  ) async {
    await tester.pumpWidget(
      MediaQuery(
        data: const MediaQueryData(disableAnimations: true),
        child: TpStartup(
          bootstrap: () async => const MaterialApp(home: Text('首页')),
        ),
      ),
    );
    await tester.pump();
    await tester.pump();
    expect(find.text('首页'), findsOneWidget);
    expect(find.byType(TpLaunchPage), findsNothing);
  });

  testWidgets(
    'late bootstrap completion after disposal does not start services',
    (tester) async {
      final ready = Completer<Widget>();
      var serviceStarts = 0;
      await tester.pumpWidget(
        TpStartup(
          bootstrap: () => ready.future,
          onHomeReady: () => serviceStarts++,
        ),
      );
      await tester.pumpWidget(const SizedBox());
      ready.complete(const MaterialApp(home: Text('旧首页')));
      await tester.pumpAndSettle();
      expect(serviceStarts, 0);
      expect(find.text('旧首页'), findsNothing);
      expect(tester.takeException(), isNull);
    },
  );
}