import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:timezone/data/latest.dart' as tzdata;
import 'package:hepan_everyday/app/app_controller.dart';
import 'package:hepan_everyday/domain/app_snapshot.dart';
import 'package:hepan_everyday/domain/app_settings.dart';
import 'package:hepan_everyday/domain/schedule_engine.dart';
import 'package:hepan_everyday/features/timetable/timetable_page.dart';
import 'package:hepan_everyday/widgets/directional_week_transition.dart';

import '../support/fakes.dart';

AppController _controller({bool hasSemester = true}) {
  Course lesson(int week) => Course(
    id: 'week-$week',
    name: '第$week周课程',
    teacher: '测试教师',
    room: 'A101',
    weekday: 3,
    startPeriod: 1,
    endPeriod: 2,
    weeks: {week},
    source: CourseSource.file,
  );
  return AppController(
    MemoryStore(
      AppSnapshot(
        courses: [lesson(1), lesson(2), lesson(3)],
        settings: AppSettings(
          semester: hasSemester
              ? Semester(startDate: DateTime(2026, 10, 12), totalWeeks: 3)
              : null,
        ),
      ),
    ),
    FakeNotifications(),
    FakeCalendar(),
    () => DateTime.utc(2026, 10, 14),
  );
}

Future<void> _open(WidgetTester tester, AppController controller) async {
  await controller.initialize();
  addTearDown(controller.dispose);
  await tester.pumpWidget(
    MaterialApp(
      home: Scaffold(body: TimetablePage(controller: controller)),
    ),
  );
  await tester.pumpAndSettle();
}

void main() {
  setUpAll(tzdata.initializeTimeZones);
  testWidgets(
    'week arrows animate the grid and current week reverses direction',
    (tester) async {
      await _open(tester, _controller());
      await tester.tap(find.byIcon(Icons.chevron_right_rounded));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(find.byType(DirectionalWeekTransition), findsOneWidget);
      expect(find.text('第1周课程'), findsOneWidget);
      expect(find.text('第2周课程'), findsOneWidget);
      expect(
        tester
            .widget<FractionalTranslation>(
              find.byKey(const Key('week-transition-incoming')),
            )
            .translation
            .dx,
        greaterThan(0),
      );
      await tester.pumpAndSettle();
      expect(find.text('第1周课程'), findsNothing);
      await tester.tap(find.text('本周'));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 100));
      expect(
        tester
            .widget<FractionalTranslation>(
              find.byKey(const Key('week-transition-incoming')),
            )
            .translation
            .dx,
        lessThan(0),
      );
      await tester.pumpAndSettle();
      expect(find.text('第 1 周'), findsOneWidget);
      expect(find.text('第2周课程'), findsNothing);
      expect(find.text('周日'), findsOneWidget);
    },
  );
  testWidgets(
    'horizontal course swipe changes week and course taps still open',
    (tester) async {
      await _open(tester, _controller());
      expect(find.text('第 1 周'), findsOneWidget);
      expect(find.text('第1周课程'), findsOneWidget);
      await tester.drag(find.text('第1周课程'), const Offset(-180, 0));
      await tester.pumpAndSettle();
      expect(find.text('第 2 周'), findsOneWidget);
      expect(find.text('第1周课程'), findsNothing);
      expect(find.text('第2周课程'), findsOneWidget);
      await tester.tap(find.text('第2周课程'));
      await tester.pumpAndSettle();
      expect(find.text('知道了'), findsOneWidget);
      await tester.tap(find.text('知道了'));
      await tester.pumpAndSettle();
      await tester.drag(find.text('周三'), const Offset(180, 0));
      await tester.pumpAndSettle();
      expect(find.text('第 1 周'), findsOneWidget);
    },
  );
  testWidgets('one swipe advances one week and stops at semester boundaries', (
    tester,
  ) async {
    await _open(tester, _controller());
    await tester.drag(find.text('周三'), const Offset(300, 0));
    await tester.pumpAndSettle();
    expect(find.text('第 1 周'), findsOneWidget);
    for (final week in [2, 3, 3]) {
      await tester.drag(find.text('周三'), const Offset(-300, 0));
      await tester.pumpAndSettle();
      expect(find.text('第 $week 周'), findsOneWidget);
    }
    await tester.tap(find.text('本周'));
    await tester.pumpAndSettle();
    expect(find.text('第 1 周'), findsOneWidget);
  });
  testWidgets('swiping an imported timetable without a semester keeps prompt', (
    tester,
  ) async {
    await _open(tester, _controller(hasSemester: false));
    await tester.drag(find.byType(TimetablePage), const Offset(-180, 0));
    await tester.pumpAndSettle();
    expect(find.text('课表已导入，请设置学期开始日'), findsOneWidget);
    expect(find.text('第 2 周'), findsNothing);
    expect(tester.takeException(), isNull);
  });
}