import 'package:flutter/material.dart';
import 'package:flutter/rendering.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(
    'conflicts keep readable full-width metadata without covering courses',
    (tester) async {
      tester.view.physicalSize = const Size(320, 800);
      tester.view.devicePixelRatio = 1;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);
      final term = Semester(startDate: DateTime(2026, 9, 7), totalWeeks: 1);
      final courses = List.generate(
        5,
        (i) => Course(
          id: '$i',
          name: '并行课程$i',
          teacher: '示例教师$i',
          room: '示例教学楼B10$i',
          weekday: 1,
          startPeriod: 1,
          endPeriod: 2,
          weeks: {1},
          source: CourseSource.file,
        ),
      );
      final events = ScheduleEngine.occurrences(courses, term);
      await tester.pumpWidget(
        MaterialApp(
          home: MediaQuery(
            data: MediaQueryData(textScaler: TextScaler.linear(2)),
            child: Scaffold(
              body: SingleChildScrollView(
                child: WeekGrid(
                  events: events,
                  monday: term.firstMonday,
                  today: term.startDate,
                  settings: AppSettings(),
                ),
              ),
            ),
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('冲突列表'), findsOneWidget);
      expect(find.text('1–2节'), findsNWidgets(5));
      final rects = <Rect>[];
      for (final c in courses) {
        final card = tester.getRect(
          find.bySemanticsLabel('${c.name}，${c.teacher}，${c.room}'),
        );
        rects.add(card);
        expect(card.width, greaterThan(30));
        for (final text in [c.teacher, c.room]) {
          final finder = find.text(text);
          final paragraph = tester.renderObject<RenderParagraph>(finder);
          for (final box in paragraph.getBoxesForSelection(
            TextSelection(baseOffset: 0, extentOffset: text.length),
          )) {
            expect(box.right, lessThanOrEqualTo(paragraph.size.width + 0.01));
          }
          expect(tester.getRect(finder).bottom, lessThanOrEqualTo(card.bottom));
        }
      }
      for (var i = 0; i < rects.length; i++) {
        for (var j = i + 1; j < rects.length; j++) {
          expect(
            rects[i].intersect(rects[j]).height,
            lessThanOrEqualTo(0.01),
            reason: '${rects[i]} / ${rects[j]}',
          );
        }
      }
      expect(tester.takeException(), isNull);
    },
  );
  testWidgets(
    'a lunch-gap arrangement has the same length as another two-lesson card',
    (tester) async {
      final term = Semester(startDate: DateTime(2026, 9, 7), totalWeeks: 1);
      Course c(String id, int day, int first) => Course(
        id: id,
        name: id,
        teacher: '教师',
        room: '教室',
        weekday: day,
        startPeriod: first,
        endPeriod: first + 1,
        weeks: {1},
        source: CourseSource.file,
      );
      final events = ScheduleEngine.occurrences([
        c('A', 1, 3),
        c('B', 2, 4),
      ], term);
      await tester.pumpWidget(
        MaterialApp(
          home: Scaffold(
            body: SingleChildScrollView(
              child: WeekGrid(
                events: events,
                monday: term.firstMonday,
                today: term.startDate,
                settings: AppSettings(),
              ),
            ),
          ),
        ),
      );
      await tester.pumpAndSettle();
      expect(
        tester.getRect(find.bySemanticsLabel('A，教师，教室')).height,
        tester.getRect(find.bySemanticsLabel('B，教师，教室')).height,
      );
    },
  );
}