parr_api/PARR.BLL/Services/Implementations/CalendarService.cs

using PARR.BLL.Services.Interfaces;

namespace PARR.BLL.Services.Implementations
{
    public delegate Task<List<DateOnly>> GetWeekendsDelegate(DateOnly start, DateOnly end);


    internal class CalendarService : ICalendarService
    {

        private DateOnly GetEndPeriodDate(DateOnly startPeriod, TimeSpan distributionPeriod)
        {
            return startPeriod.AddDays(distributionPeriod.Days).AddDays(-1);
        }


        public async Task<List<DateOnly>> GetWorkDatesForPeriodAsync(DateOnly startPeriod, TimeSpan distributionPeriod, GetWeekendsDelegate getWeekends)
        {
            var endPeriod = GetEndPeriodDate(startPeriod, distributionPeriod);


            var weekends = await getWeekends.Invoke(startPeriod, endPeriod);

            //TODO: logic!!!

            //временно сделаем список руками рабочих дней
            var workDates = new List<DateOnly>();


            return workDates;
        }
    }


    public class Test
    {
        private readonly ICalendarService calendarService;

        public Test(ICalendarService calendarService)
        {
            this.calendarService = calendarService;
        }


        public async void Ttt()
        {
            var tService = new TestService();
           // var endPeriod = calendarService.GetEndPeriodDate(new DateOnly(2024, 1, 1), TimeSpan.Parse("30:00:00:00"));

            var workDays = await calendarService.GetWorkDatesForPeriodAsync(new DateOnly(2024, 1, 1), TimeSpan.Parse("30:00:00:00"), tService.GetWeekendsAsync);


        }


    }


    public class TestService
    {
        public async Task<List<DateOnly>> GetWeekendsAsync(DateOnly start, DateOnly end)
        {

            await Task.Delay(1000);

            return new List<DateOnly> { new DateOnly(2024, 1, 12) };
        }
    }
}