import 'dart:io';

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/data/file_snapshot_store.dart';
import 'package:hepan_everyday/domain/app_snapshot.dart';
import 'package:hepan_everyday/features/profile/settings_page.dart';
import 'package:hepan_everyday/features/timetable/week_grid.dart';
import 'package:hepan_everyday/domain/schedule_engine.dart';

import '../support/fakes.dart';
import '../domain/schedule_engine_test.dart' show course;

void main() {
  setUpAll(tzdata.initializeTimeZones);
  test('old saved preferences gain longer default and malformed length is rejected', () {
    final old = AppSnapshot().toJson();
    (old['settings'] as Map).remove('courseHeightScale');
    expect(
      (AppSnapshot.fromJson(old).toJson()['settings']
          as Map)['courseHeightScale'],
      1.25,
    );
    for (final value in [null, 'long', 0.5, 2.5, double.nan, double.infinity]) {
      final json = AppSnapshot().toJson();
      (json['settings'] as Map)['courseHeightScale'] = value;
      expect(() => AppSnapshot.fromJson(json), throwsFormatException);
    }
  });
  test('custom course length survives an actual disk reload', () async {
    final directory = await Directory.systemTemp.createTemp(
      'riverside-length-',
    );
    try {
      final json = AppSnapshot().toJson();
      (json['settings'] as Map)['courseHeightScale'] = 1.8;
      await FileSnapshotStore(directory).save(AppSnapshot.fromJson(json));
      final restored = await FileSnapshotStore(directory).load();
      expect((restored!.toJson()['settings'] as Map)['courseHeightScale'], 1.8);
    } finally {
      await directory.delete(recursive: true);
    }
  });
  testWidgets(
    'length slider persists across reopening and increases equal-duration bars',
    (tester) async {
      final store = MemoryStore();
      final term = Semester(startDate: DateTime(2026, 9, 7), totalWeeks: 1);
      final json = AppSnapshot(
        courses: [
          course(id: 'A', day: 1, first: 3, last: 4),
          course(id: 'B', day: 7, first: 3, last: 4),
        ],
      ).toJson();
      (json['settings'] as Map)['semester'] = {
        'startDate': '2026-09-07',
        'totalWeeks': 1,
      };
      await store.save(AppSnapshot.fromJson(json));
      final c = AppController(
        store,
        FakeNotifications(),
        FakeCalendar(),
        () => DateTime.utc(2026, 9, 7),
      );
      await c.initialize();
      Future<double> barHeight(AppController controller) async {
        final events = ScheduleEngine.occurrences(
          controller.snapshot.courses,
          term,
        );
        await tester.pumpWidget(
          MaterialApp(
            home: Scaffold(
              body: SingleChildScrollView(
                child: WeekGrid(
                  events: events,
                  monday: term.firstMonday,
                  today: term.startDate,
                  settings: controller.snapshot.settings,
                ),
              ),
            ),
          ),
        );
        await tester.pumpAndSettle();
        final a = tester.getRect(find.bySemanticsLabel('矩阵论，示例教师，示例教室').first),
            b = tester.getRect(find.bySemanticsLabel('矩阵论，示例教师，示例教室').last);
        expect(a.height, b.height);
        expect(tester.getRect(find.text('周日')).right, lessThanOrEqualTo(800));
        return a.height;
      }

      final before = await barHeight(c);
      final alarmsBefore =
          (c.notifications as FakeNotifications).reconciliations;
      final calendarsBefore = (c.calendar as FakeCalendar).synchronizations;
      await tester.pumpWidget(MaterialApp(home: SettingsPage(controller: c)));
      await tester.pumpAndSettle();
      final slider = find.byKey(const Key('course-height-slider'));
      await tester.ensureVisible(slider);
      await tester.pumpAndSettle();
      final rect = tester.getRect(slider);
      await tester.dragFrom(
        Offset(rect.left + rect.width * 0.4, rect.center.dy),
        Offset(rect.width * 0.4, 0),
      );
      await tester.pumpAndSettle();
      final value =
          (c.snapshot.toJson()['settings'] as Map)['courseHeightScale']
              as double;
      expect(value, greaterThan(1.25));
      expect(
        (c.notifications as FakeNotifications).reconciliations,
        alarmsBefore,
      );
      expect((c.calendar as FakeCalendar).synchronizations, calendarsBefore);
      final restarted = AppController(
        store,
        FakeNotifications(),
        FakeCalendar(),
        () => DateTime.utc(2026, 9, 7),
      );
      await restarted.initialize();
      expect(
        (restarted.snapshot.toJson()['settings'] as Map)['courseHeightScale'],
        value,
      );
      expect(await barHeight(restarted), greaterThan(before));
      await tester.pumpWidget(
        MaterialApp(home: SettingsPage(controller: restarted)),
      );
      await tester.pumpAndSettle();
      await tester.ensureVisible(find.text('恢复默认'));
      await tester.tap(find.text('恢复默认'));
      await tester.pumpAndSettle();
      expect(
        (restarted.snapshot.toJson()['settings'] as Map)['courseHeightScale'],
        1.25,
      );
      expect(await barHeight(restarted), before);
      expect(tester.takeException(), isNull);
      c.dispose();
      restarted.dispose();
    },
  );
}