import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:smoke_cess_app/services/date_service.dart';
import 'package:smoke_cess_app/services/pages_service.dart';
import 'package:timezone/data/latest.dart' as tz;
import 'package:timezone/timezone.dart';
import '../mock/settings_mock.dart';

void main() async {
  tz.initializeTimeZones();
  WidgetsFlutterBinding.ensureInitialized();
  SharedPreferences.setMockInitialValues(mockSettings);
  group('Helpers', () {
    group('isSameDay', () {
      test('returns true when dates are the same day', () {
        DateTime dateA = DateTime.now();
        DateTime dateB = DateTime(dateA.year, dateA.month, dateA.day, 10, 0);
        expect(isSameDay(dateA, dateB), true);
      });

      test('returns false when dates are different days', () {
        DateTime dateA = DateTime.now();
        DateTime dateB =
            DateTime(dateA.year, dateA.month, dateA.day + 1, 10, 0);
        expect(isSameDay(dateA, dateB), false);
      });

      test('returns false when one date is null', () {
        DateTime? dateA = DateTime.now();
        DateTime? dateB;
        expect(isSameDay(dateA, dateB), false);
      });
    });

    group('createTZDateTimes', () {
      test('returns empty list when selectedDays is null', () {
        List<TZDateTime> tzDateTimes = createTZDateTimes(null, 10, 0);
        expect(tzDateTimes, []);
      });

      test('returns empty list when selectedHours is null', () {
        List<TZDateTime> tzDateTimes = createTZDateTimes(['Montag'], null, 0);
        expect(tzDateTimes, []);
      });

      test('returns empty list when selectedMinutes is null', () {
        List<TZDateTime> tzDateTimes = createTZDateTimes(['Montag'], 10, null);
        expect(tzDateTimes, []);
      });

      test('returns empty list when no valid dates are found', () {
        List<TZDateTime> tzDateTimes = createTZDateTimes(['Mong'], 10, 0);
        expect(tzDateTimes, []);
      });

      test('returns list of valid dates', () {
        List<TZDateTime> tzDateTimes = createTZDateTimes(['Montag'], 10, 0);
        expect(tzDateTimes.length, greaterThan(0));
      });

      test('returns all the same days as today in next 6 weeks at 23:59', () {
        List<String> selectedDays = [
          weekDays.keys.elementAt(DateTime.now().weekday - 1)
        ];
        List<TZDateTime> expected = [];
        DateTime now = DateTime.now();
        final Duration offset = now.timeZoneOffset;
        final DateTime date =
            DateTime(now.year, now.month, now.day, 23, 59, 0, 0, 0);
        for (int i = 0; i <= trainingTime; i = i + 7) {
          expected.add(
              TZDateTime.local(date.year, date.month, date.day, 23, 59, 0, 0, 0)
                  .add(Duration(days: i))
                  // subtract offset since TZDateTime uses the UTC Timezone
                  .subtract(offset));
        }
        List<TZDateTime> result = createTZDateTimes(selectedDays, 23, 59);
        expect(result, expected);
      });
    });

    group('getTimeTill', () {
      test('returns time till next mood', () async {
        Duration duration = await getTimeTill(Pages.mood);
        expect(duration, isNotNull);
      });

      test('returns time till next sleep', () async {
        Duration duration = await getTimeTill(Pages.sleep);
        expect(duration, isNotNull);
      });
      test('returns time till next workout', () async {
        Duration duration = await getTimeTill(Pages.timer);
        expect(duration, isNotNull);
      });
    });
  });

  group('Helper functions', () {
    test('isSameDay returns true if two dates are the same day', () {
      final date1 = DateTime(2022, 3, 6);
      final date2 = DateTime(2022, 3, 6, 15, 30);
      final result = isSameDay(date1, date2);
      expect(result, true);
    });

    test('isSameDay returns false if two dates are not the same day', () {
      final date1 = DateTime(2022, 3, 6);
      final date2 = DateTime(2022, 3, 7);
      final result = isSameDay(date1, date2);
      expect(result, false);
    });

    test('createTZDateTimes returns a list of TZDateTime objects', () async {
      final selectedDays = ['Montag', 'Dienstag'];
      const selectedHours = 12;
      const selectedMinutes = 30;
      final result =
          createTZDateTimes(selectedDays, selectedHours, selectedMinutes);
      expect(result, isA<List<TZDateTime>>());
    });
  });
}