计算调休的假日该上哪一天的课

calculate_adjusted_workday_relationship.dart

import 'package:dart_extensions/dart_extensions.dart';
import 'package:intl/intl.dart';
import 'package:lunar/lunar.dart';

List<Map<String, String>> calculateAdjustedWorkdayRelationship(
    {required List<Holiday> holidays,
    required String holidayName,
    required int Function(String holidayName) getHolidayLength}) {
  final dataTimeFormat = DateFormat("yyyy-MM-dd");

  final holidayDays =
      holidays.map((e) => dataTimeFormat.parse(e.getDay())).toList();

  final trueHoliday = holidays.filter((e) => !e.isWork()).toList();

  final trueHolidayDays =
      trueHoliday.map((e) => dataTimeFormat.parse(e.getDay())).toList();

  final holidayRawStartDay =
      dataTimeFormat.parse(trueHoliday.first.getTarget());

  final holidayRawDay = getHolidayLength(holidayName);

  final holidayRawDays = <DateTime>[];

  for (int i = 0; i < holidayRawDay; i++) {
    holidayRawDays.add(holidayRawStartDay.add(Duration(days: i)));
  }
  final holidayRawDaysCopy = List.from(holidayRawDays);

  var i = 1;
  for (final day in holidayRawDays) {
    // 2020
    if (day.isWeekend()) {
      var newDay =
          holidayRawDays[holidayRawDays.length - 1].add(Duration(days: i));
      while (true) {
        if (newDay.isWeekend()) {
          i++;
          newDay = newDay.add(Duration(days: 1));
        } else {
          break;
        }
      }
      holidayRawDaysCopy.add(newDay);
      i++;
    }
  }

  final originalDaysByAdjustedWorkDays = <DateTime>[];
  for (final day in trueHolidayDays) {
    if (!day.isWeekend() && !holidayRawDaysCopy.contains(day)) {
      originalDaysByAdjustedWorkDays.add(day);
    }
  }

  final adjustedWorkDays =
      holidayDays.where((day) => !trueHolidayDays.contains(day)).toList();

  final adjustedDaysList = <Map<String, String>>[];
  for (int j = 0; j < adjustedWorkDays.length; j++) {
    try {
      final adjustedDaysMap = {
        "name": holidayName,
        "target": trueHoliday.last.getTarget(),
        "adjusted_workday": dataTimeFormat.format(adjustedWorkDays[j]),
        "original_day":
            dataTimeFormat.format(originalDaysByAdjustedWorkDays[j]),
      };
      adjustedDaysList.add(adjustedDaysMap);
    } catch (e) {
      print(e);
      print(holidayName);
      print(trueHoliday.first.getName());
      rethrow;
    }
  }

  return adjustedDaysList;
}

main() {
  final holidaysYear = HolidayUtil.getHolidaysByYear(2024);
  final nationalDayAndMidAutumnFestival =
      holidaysYear.firstOrNullWhere((e) => e.getName() == "国庆中秋") != null;
  final holidays = holidaysYear.groupBy((Holiday e) => getHolidayGroupName(e));
  print(holidays);
  final result = holidays.entries
      .map((e) => calculateAdjustedWorkdayRelationship(
          holidays: e.value,
          holidayName: getHolidayGroupName(e.value.first),
          getHolidayLength: (name) =>
              getHolidayLenght(name, nationalDayAndMidAutumnFestival)))
      .toList();
  for (final e in result) {
    print(e);
  }
}

int getHolidayLenght(String name, bool nationalDayAndMidAutumnFestival) {
  if (RegExp("春节|国庆").hasMatch(name)) {
    if (nationalDayAndMidAutumnFestival && name.contains("国庆")) {
      return 4;
    }
    return 3;
  }
  return 1;
}

String getHolidayGroupName(Holiday e) => e.getName().contains("国庆中秋")
    ? e.getName().replaceAll("国庆中秋", "国庆节")
    : e.getName();

extension WeekendExt on DateTime {
  bool isWeekend() {
    return weekday == 6 || weekday == 7;
  }
}