import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:timezone/data/latest.dart' as tzdata;
import 'package:hepan_everyday/features/timetable/week_grid.dart';
import 'package:hepan_everyday/domain/schedule_engine.dart';
import 'package:hepan_everyday/domain/app_settings.dart';

void main() {
  setUpAll(tzdata.initializeTimeZones);
  testWidgets('transitive lesson conflicts never cover another course card', (
    tester,
  ) async {
    final term = Semester(startDate: DateTime(2026, 9, 7), totalWeeks: 1);
    Course c(String name, int first, int last) => Course(
      id: name,
      name: name,
      teacher: 'T',
      room: 'R',
      weekday: 1,
      startPeriod: first,
      endPeriod: last,
      weeks: {1},
      source: CourseSource.file,
    );
    final events = ScheduleEngine.occurrences([
      c('A', 1, 2),
      c('B', 2, 3),
      c('C', 3, 4),
    ], term);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: SingleChildScrollView(
            child: WeekGrid(
              events: events,
              monday: term.firstMonday,
              today: term.startDate,
              settings: const AppSettings(),
            ),
          ),
        ),
      ),
    );
    await tester.pumpAndSettle();
    final a = tester.getRect(find.bySemanticsLabel('A，T，R'));
    final b = tester.getRect(find.bySemanticsLabel('B，T，R'));
    final cRect = tester.getRect(find.bySemanticsLabel('C，T，R'));
    expect(a.right, lessThanOrEqualTo(b.left));
    expect(b.right, lessThanOrEqualTo(cRect.left));
  });
}