using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         List<DayOfWeek> BworkingDays = new List<DayOfWeek>();

            BworkingDays.Add(DayOfWeek.Monday);

            BworkingDays.Add(DayOfWeek.Tuesday);

            BworkingDays.Add(DayOfWeek.Wednesday);

            BworkingDays.Add(DayOfWeek.Thursday);

            BworkingDays.Add(DayOfWeek.Friday);

           // BworkingDays.Add(DayOfWeek.Saturday);

            //BworkingDays.Add(DayOfWeek.Sunday);

​

            var BSlaStartAt = new DateTime(2021, 08, 13, 22, 0, 0);

            var Bhours = 2;

            var BWorkingTimeStart = new TimeSpan(8, 0, 0);

            var BWorkingTimeEnd = new TimeSpan(18, 0, 0);

​

            var BOnDutyTimeStart = new TimeSpan(20, 0, 0);

            var BOnDutyTimeEnd = new TimeSpan(23, 0, 0);

            CalculateSlaService.CalculateSla(BSlaStartAt, BworkingDays, Bhours, BWorkingTimeStart, BWorkingTimeEnd, BOnDutyTimeStart, BOnDutyTimeEnd, null);

​

    }

     public static class CalculateSlaService

    {

        public static void CalculateSla(DateTime date, List<DayOfWeek> workingDays, int hours, TimeSpan startHour, TimeSpan endHour, TimeSpan OnDutyTimeStart, TimeSpan OnDutyTimeEnd, List<DateTime> holidays)

        {

​

​

            var totalDays = TimeSpan.FromHours(hours);

​

            Console.WriteLine("Normal = " + startHour + " as " + endHour);

​

            Console.WriteLine("Plantao = " + OnDutyTimeStart + " as " + OnDutyTimeEnd);

​

            var delivery = new DateTime(date.Ticks);

​

            Console.WriteLine("------------------------------------------------\n");

​

​

​

            Console.WriteLine("TOTAL de HORAS " + totalDays + "\n");

​

​

            delivery = CalcTime(date, new TimeSpan(1, 0, 0), totalDays, delivery, startHour, endHour, OnDutyTimeStart, OnDutyTimeEnd, workingDays);

​

​

            Console.WriteLine("START = " + date.ToString("dd/MM/yyy HH:mm"));

            Console.WriteLine("ENTREGA = " + delivery.ToString("dd/MM/yyy HH:mm"));

​

​

            Console.WriteLine("------------------------------------------------\n");

        }

​

        private static bool CalcRange(DateTime delivery, TimeSpan startHour, TimeSpan endHour, TimeSpan OnDutyTimeStart, TimeSpan OnDutyTimeEnd)

        {

​

            var rangeStartHour = RangeDateStart(delivery, startHour, endHour);

            var rangeEndtHour = RangeDateEnd(delivery, startHour, endHour);

​

            var rangeStartDutyHour = RangeDateStart(delivery, OnDutyTimeStart, OnDutyTimeEnd);

            var rangeEndDutyHour = RangeDateEnd(delivery, OnDutyTimeStart, OnDutyTimeEnd);

​

​

            if (startHour.Equals(TimeSpan.Zero) && endHour.Equals(TimeSpan.Zero) || startHour.Equals(endHour))

            {

                return true;

            }

​

            return (delivery >= rangeStartHour && delivery < rangeEndtHour) || (delivery >= rangeStartDutyHour && delivery < rangeEndDutyHour);

        }

​

        private static DateTime RangeDateStart(DateTime currentdate, TimeSpan start, TimeSpan end)

        {

​

            var day = new TimeSpan(24, 0, 0);

​

            var ch = (end - start);

​

            var h = ch < TimeSpan.Zero ? ch + day : ch;

​

            return currentdate.TimeOfDay > TimeSpan.FromHours(12) ? currentdate.AddHours(-(currentdate.TimeOfDay.Hours - start.Hours)) : currentdate.Add((end - currentdate.TimeOfDay)).AddHours(-h.Hours);

​

        }

​

        private static DateTime RangeDateEnd(DateTime currentdate, TimeSpan start, TimeSpan end)

        {

​

​

            var day = new TimeSpan(24, 0, 0);

​

            var ch = (end - start);

​

            var h = ch < TimeSpan.Zero ? ch + day : ch;

​

            var s = currentdate.TimeOfDay > TimeSpan.FromHours(12) ? currentdate.AddHours(-(currentdate.TimeOfDay.Hours - start.Hours)) : currentdate.Add((end - currentdate.TimeOfDay)).AddHours(-h.Hours);

​

            return s.AddHours(h.Hours);

​

        }

​

        private static DateTime CalcTime(DateTime slaStart, TimeSpan time, TimeSpan totalDays, DateTime delivery, TimeSpan startHour, TimeSpan endHour, TimeSpan OnDutyTimeStart, TimeSpan OnDutyTimeEnd, List<DayOfWeek> workingDays, bool blocked = false)

        {

            var timeLeft = TimeSpan.Zero;

            while (timeLeft < totalDays)

            {

​

                if (!workingDays.Contains(RangeDateStart(delivery, startHour, endHour).DayOfWeek) && !workingDays.Contains(RangeDateStart(delivery, OnDutyTimeStart, OnDutyTimeEnd).DayOfWeek))

                {

                    delivery = delivery.AddDays(1);

                    delivery = new DateTime(delivery.Year, delivery.Month, delivery.Day, startHour.Hours, endHour.Minutes, 0);

                    continue;

                }

​

                if (CalcRange(delivery, startHour, endHour, OnDutyTimeStart, OnDutyTimeEnd))

​

                {

​

                    if (timeLeft.Add(time) >= totalDays && !blocked)

                    {

​

                        delivery = CalcTime(slaStart, new TimeSpan(0, 1, 0), time, delivery, startHour, endHour, OnDutyTimeStart, OnDutyTimeEnd, workingDays, true);

​

                    }

                    else

                    {

​

                        delivery = delivery.Add(time);

                    }

​

                    timeLeft = timeLeft.Add(time);

​

​

                }

                else

                {

​

                    delivery = delivery.Add(new TimeSpan(1, 0, 0));

                    if (!workingDays.Contains(delivery.DayOfWeek))

                    {

                        delivery = delivery.AddDays(1);

                    }

                }

​

​

​

            }

​

            return delivery;

        }

​

​

​

​

    }

}