import 'package:smoke_cess_app/services/settings_service.dart';
import 'package:timezone/timezone.dart';

import 'pages_service.dart';

const int trainingTime = 6 * 7;

const weekDays = {
  "Montag": 1,
  "Dienstag": 2,
  "Mittwoch": 3,
  "Donnerstag": 4,
  "Freitag": 5,
  "Samstag": 6,
  "Sonntag": 7,
};

bool isSameDay(DateTime? dateA, DateTime? dateB) {
  return dateA?.year == dateB?.year &&
      dateA?.month == dateB?.month &&
      dateA?.day == dateB?.day;
}

Future<List<TZDateTime>> getDatesforMood() async {
  final List<String>? selectedDays = await getMoodQueryDaysCategories();
  final int? selectedHours = await getMoodQueryHours();
  final int? selectedMinutes = await getMoodQueryMinutes();
  return createTZDateTimes(selectedDays, selectedHours, selectedMinutes);
}

Future<List<TZDateTime>> getDatesforSleep() async {
  final List<String>? selectedDays = await getSleepQueryDaysCategories();
  final int? selectedHours = await getSleepQueryHours();
  final int? selectedMinutes = await getSleepQueryMinutes();
  return createTZDateTimes(selectedDays, selectedHours, selectedMinutes);
}

Future<TZDateTime?> getTodayMood() async {
  List<TZDateTime> moodDates = await getDatesforMood();
  Iterable<TZDateTime> today =
      moodDates.where((element) => isSameDay(element, DateTime.now()));
  return today.isNotEmpty ? today.first : null;
}

Future<TZDateTime?> getTodaySleep() async {
  List<TZDateTime> sleepDates = await getDatesforSleep();
  Iterable<TZDateTime> today =
      sleepDates.where((element) => isSameDay(element, DateTime.now()));
  return today.isNotEmpty ? today.first : null;
}

Future<Duration> getTimeTillNextMood() async {
  List<TZDateTime> moodDates = await getDatesforMood();
  Iterable<TZDateTime> nextDate =
      moodDates.where((element) => element.isAfter(DateTime.now()));
  Duration duration = nextDate.isNotEmpty
      ? nextDate.first.difference(DateTime.now())
      : const Duration(seconds: 0);
  return duration;
}

Future<Duration> getTimeTillNextSleep() async {
  List<TZDateTime> sleepDates = await getDatesforSleep();
  Iterable<TZDateTime> nextDate =
      sleepDates.where((element) => element.isAfter(DateTime.now()));
  Duration duration = nextDate.isNotEmpty
      ? nextDate.first.difference(DateTime.now())
      : const Duration(seconds: 0);
  return duration;
}

Future<Duration> getTimeTillNextWorkout() async {
  DateTime now = DateTime.now();
  DateTime tomorrow =
      DateTime(now.year, now.month, now.day).add(const Duration(days: 1));
  Duration duration = tomorrow.difference(now);
  return duration;
}

Future<Duration> getTimeTill(Pages page) {
  switch (page) {
    case Pages.mood:
      return getTimeTillNextMood();
    case Pages.sleep:
      return getTimeTillNextSleep();
    default:
      return getTimeTillNextWorkout();
  }
}

List<TZDateTime> createTZDateTimes(
    List<String>? selectedDays, int? selectedHours, int? selectedMinutes) {
  final List<TZDateTime> tzDateTimes = [];
  final DateTime now = DateTime.now();
  final Duration offset = now.timeZoneOffset;
  if (selectedDays == null ||
      selectedHours == null ||
      selectedMinutes == null) {
    return tzDateTimes;
  }
  final Iterable<int?> selectedDaysInt =
      selectedDays.map((day) => weekDays[day]);
  for (int i = 0; i < trainingTime; i++) {
    final DateTime date = DateTime(now.year, now.month, now.day, selectedHours,
            selectedMinutes, 0, 0, 0)
        .add(Duration(days: i));
    if (selectedDaysInt.contains(date.weekday)) {
      tzDateTimes.add(TZDateTime.local(date.year, date.month, date.day,
              selectedHours, selectedMinutes, 0, 0, 0)
          .subtract(offset));
    }
  }
  return tzDateTimes;
}