import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_calendar/calendar.dart';

import '../../../../api/webuntis/queries/getHolidays/getHolidaysResponse.dart';
import '../../../../extensions/dateTime.dart';
import '../data/webuntis_time.dart';
import 'time_region_tile.dart';

class SpecialRegionsBuilder {
  final GetHolidaysResponse holidays;
  final ColorScheme colorScheme;
  final Color disabledColor;

  SpecialRegionsBuilder({
    required this.holidays,
    required this.colorScheme,
    required this.disabledColor,
  });

  List<TimeRegion> build() {
    final lastMonday = DateTime.now().subtract(const Duration(days: 14)).nextWeekday(DateTime.monday);
    final firstBreak = lastMonday.copyWith(hour: 10, minute: 15);
    final secondBreak = lastMonday.copyWith(hour: 13, minute: 50);

    final holidayRegions = _buildHolidayRegions().toList();
    bool isInHoliday(DateTime time) => holidayRegions.any((region) => region.startTime.isSameDay(time));

    return [
      ...holidayRegions,
      if (!isInHoliday(firstBreak)) _breakRegion(firstBreak, const Duration(minutes: 20)),
      if (!isInHoliday(secondBreak)) _breakRegion(secondBreak, const Duration(minutes: 15)),
    ];
  }

  Iterable<TimeRegion> _buildHolidayRegions() => holidays.result.expand((holiday) {
        final startDay = WebuntisTime.parse(holiday.startDate, 0);
        final dayCount = WebuntisTime.parse(holiday.endDate, 0).difference(startDay).inDays;
        final days = List<DateTime>.generate(dayCount, (i) => startDay.add(Duration(days: i)));
        return days.map((day) => TimeRegion(
              startTime: day.copyWith(hour: 7, minute: 55),
              endTime: day.copyWith(hour: 16, minute: 30),
              text: '$kTimeRegionHolidayPrefix${holiday.name}',
              color: disabledColor.withAlpha(50),
              iconData: Icons.holiday_village_outlined,
            ));
      });

  TimeRegion _breakRegion(DateTime start, Duration duration) => TimeRegion(
        startTime: start,
        endTime: start.add(duration),
        recurrenceRule: 'FREQ=DAILY;INTERVAL=1',
        text: kTimeRegionCenterIcon,
        color: colorScheme.primary.withAlpha(50),
        iconData: Icons.restaurant,
      );
}