Задание по расписанию

public class ScheduledJobHandler : IScheduledJobHandler {

    public async Task Execute(ScheduledJobContext context)
    {

        await Task.CompletedTask;
    }
}

public class ScheduledJobHandler : IScheduledJobHandler
{
    private static readonly Guid SubmittedId = new("4dc757b3-0f7a-4c5e-8111-e669e14172b0");

    public async Task Execute(ScheduledJobContext context)
    {
        var timesheetService = context.GetEntityService<TimeSheet>();
        var timesheets = await timesheetService
            .Get(ts => ts.DateFrom.Month == DateTime.Now.Month)
            .Include(ts => ts.TimeAllocations)
            .ToListAsync();
        foreach (var timesheet in timesheets)
            await HandleTimesheet(context, timesheet);
    }

    private async Task HandleTimesheet(ScheduledJobContext context, TimeSheet timesheet)
    {
        var handledStateIds = new Guid[] { TimeSheet.DraftId, SubmittedId };
        if (!handledStateIds.Contains(timesheet.StateId))
            return;

        if (timesheet.StateId == TimeSheet.DraftId)
            await HandleDraft(context, timesheet);

        timesheet.StateId = TimeSheet.ApprovedId;
        return;
    }

    private async Task HandleDraft(ScheduledJobContext context, TimeSheet timesheet)
    {
        var userScheduleService = context.GetEntityService<UserSchedule>();
        var userSchedule = await userScheduleService
            .Get(us => us.UserId == timesheet.UserId)
            .Include(us => us.Schedule)
            .ThenInclude(s => s.PatternDays)
            .GetEffectiveOnDateAsync(timesheet.DateFrom);
        var schedule = userSchedule.Schedule;

        var (start, end) = (timesheet.DateFrom, timesheet.DateTo);
        var scheduleHours = Enumerable
            .Range(0, 1 + end.Subtract(start).Days)
            .Select(offset => start.AddDays(offset))
            .Sum(date => DayLengthFrom(schedule, date));
        var actualHours = timesheet.TimeAllocations.Sum(ta => ta.Hours);
        if (actualHours >= scheduleHours)
            return;

        var projectService = context.GetEntityService<Project>();
        var downtimeProject = await projectService
            .Get(p => p.Code == "DOWNTIME")
            .Include(p => p.ProjectTasks)
            .FirstOrDefaultAsync();
        if (downtimeProject is null)
            return;

        var timesheetLineService = context.GetEntityService<TimeSheetLine>();
        var downtimeLine = await timesheetLineService
            .Get(tsl => tsl.TimeSheetId == timesheet.Id)
            .Include(tsl => tsl.TimeAllocations)
            .FirstOrDefaultAsync(tsl => tsl.ProjectId == downtimeProject.Id);
        if (downtimeLine is null)
        {
            var mainTask = downtimeProject.ProjectTasks
                .First(pt => !pt.LeadTaskId.HasValue);
            downtimeLine = new TimeSheetLine
            {
                TimeSheetId = timesheet.Id,
                ProjectId = downtimeProject.Id,
                ProjectTaskId = mainTask.Id
            };
            downtimeLine = await timesheetLineService.InsertAsync(downtimeLine);
        }

        var timeAllocationService = context.GetEntityService<TimeAllocation>();
        var hoursDiff = scheduleHours - actualHours;
        var downtimeAllocation = new TimeAllocation
        {
            TimeSheetId = timesheet.Id,
            TimeSheetLineId = downtimeLine.Id,
            UserId = timesheet.UserId,
            Date = timesheet.DateTo,
            Hours = hoursDiff
        };
        await timeAllocationService.InsertAsync(downtimeAllocation);
    }

    private int DayNumberFrom(Schedule schedule, DateTime date)
    {
        var isWeek = schedule.PatternDays.Count == 7;
        if (isWeek)
            return DayOfWeekNumberIso(date);

        var isSingleDay = schedule.PatternDays.Count == 1;
        if (isSingleDay)
            return 1;

        var firstDayInPast = schedule.FirstDay <= date;
        var daysDiff = Math.Abs(date.Subtract(schedule.FirstDay!.Value).Days);
        var daysCount = schedule.PatternDays.Count;
        if (firstDayInPast)
        {
            var futureDayNumber = (daysDiff + 1) % daysCount;
            if (futureDayNumber == decimal.Zero)
                futureDayNumber = daysCount;
            return futureDayNumber;
        }

        var pastDayNumber = daysDiff % daysCount;
        if (pastDayNumber == decimal.Zero)
            pastDayNumber = daysCount;
        int InvertDayNumber(int number) => daysCount + 1 - number;
        return InvertDayNumber(pastDayNumber);
    }

    private decimal DayLengthFrom(Schedule schedule, DateTime date)
    {
        var exceptionDays = schedule.ScheduleException?.ExceptionDays;
        var exceptionDay = exceptionDays?.FirstOrDefault(ed => ed.Date == date);
        if (exceptionDay != null)
            return exceptionDay.DayLength;

        var dayNumber = DayNumberFrom(schedule, date);
        var orderedPatternDays = schedule.PatternDays.OrderBy(pd => pd.DayNumber);
        var patternDay = orderedPatternDays.ElementAtOrDefault(dayNumber - 1);
        return patternDay?.DayLength ?? decimal.Zero;
    }

    private int DayOfWeekNumberIso(DateTime date) =>
        date.DayOfWeek switch
        {
            DayOfWeek.Monday => 1,
            DayOfWeek.Tuesday => 2,
            DayOfWeek.Wednesday => 3,
            DayOfWeek.Thursday => 4,
            DayOfWeek.Friday => 5,
            DayOfWeek.Saturday => 6,
            DayOfWeek.Sunday => 7,
        };
}