using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        JObject jEvent = new JObject();

        JObject jRepeat = new JObject();

        DateTime zeroTime = new DateTime(1, 1, 1);

        EndRepeatType EndRepeatType = EndRepeatType.Repetitions;

        Int32 Repetitions = 2;

​

        DateTime dFrom = new DateTime(2015,12,31);

        Console.WriteLine("dFrom - "  +dFrom.ToString());

        DateTime MaxRepeatDateParse =new DateTime(2016,1,10);

        int Step = 1;

        string[] RepeatDays =new string[] {"Sun","Mon"};

        Console.WriteLine("RepeatDays - "  +String.Join(",",RepeatDays));

        //FrequencyType FrequencyType = FrequencyType.Weekly;

​

        // how many days left from start event week to the end of the week

        int DayOfWeek = ((int)dFrom.DayOfWeek == 0) ? 1 : (int)dFrom.DayOfWeek  +1;

        Console.WriteLine("DayOfWeek - "  +DayOfWeek.ToString());

        //calulate when the new week is start

        int daysToAdd = DayOfWeek==7 ? 0 :7 - DayOfWeek;

        Console.WriteLine("daysToAdd - "  +daysToAdd.ToString());

        // start from the next week

        DateTime StartDate = dFrom.AddDays(daysToAdd + 1) ;

        Console.WriteLine("StartDate - "  +StartDate.ToString());

        if (EndRepeatType == EndRepeatType.Repetitions && Repetitions > 0 )

        {

            //get the last date of the last day by Repetitions

            MaxRepeatDateParse = (StartDate).AddDays ( (Repetitions * 7)  );

        }

        Console.WriteLine("MaxRepeatDateParse - "  +MaxRepeatDateParse.ToString());

        // Set according the product what is the max Repetitions Allowed 

        double TotalYears =  (MaxRepeatDateParse - dFrom).TotalDays / 365;

        if ( TotalYears > 2 )

        {

            MaxRepeatDateParse = dFrom.AddYears ( 2 );

        }

        //get total days 

        double TotalDaysAllowed = (MaxRepeatDateParse - StartDate).TotalDays;

        Console.WriteLine("TotalDaysAllowed - "  +TotalDaysAllowed.ToString());

        //get the number of weeks from total days

        double TotalRepetitionsAllowed = TotalDaysAllowed / 7;

        Console.WriteLine("TotalRepetitionsAllowed - "  +TotalRepetitionsAllowed.ToString());

        //get full weeks

        double FullWeeksRepetitions = (Int32) TotalRepetitionsAllowed;

        Console.WriteLine("FullWeeksRepetitions - "  +FullWeeksRepetitions.ToString());

        DateTime currentWeekFirstDate = StartDate;

        Console.WriteLine("---------------------- currentWeekFirstDate ------ "  +currentWeekFirstDate.ToString());

        DateTime CurrentStartDate = DateTime.MinValue;

        for ( Int32 i = 0 ; i < FullWeeksRepetitions ; i += Step )

        {

            //get the first date of the week

            currentWeekFirstDate = StartDate.AddDays ( i * 7 );

            Console.WriteLine(" ----------------- Week Start At --------------- " + currentWeekFirstDate);                  

            //loop week days

            for (Int32 d =0; d < 7; d++)

            {

                CurrentStartDate = currentWeekFirstDate.AddDays(d);

                var  currentDayOfWeek =CurrentStartDate.DayOfWeek.ToString().Substring(0,3);

                foreach (string day in RepeatDays)

                {

                    if(day.ToString().Contains(currentDayOfWeek))

                    {

                        Console.WriteLine("Add to calendar -  " +day+ " - "  +CurrentStartDate.ToString());

                    }

                }

            }

        }

        if(EndRepeatType == EndRepeatType.Date ){

            Console.WriteLine("----------------------Last week  check---------------" + CurrentStartDate.ToString());

        // how many days left from start event week to the end of the week

        int DayOfLastWeek = ((int)MaxRepeatDateParse.DayOfWeek == 0) ? 1 : (int)MaxRepeatDateParse.DayOfWeek;

        Console.WriteLine("DayOfLastWeek - "  +DayOfLastWeek.ToString());

        //calulate when the last week is start

        int LastdaysToAdd = DayOfLastWeek==7 ? 0 :7 - DayOfLastWeek;

        Console.WriteLine("LastdaysToAdd - "  +LastdaysToAdd.ToString());

        //loop the days of the last day to see if we can add another events

        for ( Int32 d = 0 ; d < LastdaysToAdd ; d++ )

        {

            CurrentStartDate = CurrentStartDate.AddDays(d);

            var  currentDayOfWeek =CurrentStartDate.DayOfWeek.ToString().Substring(0,3);

            foreach ( string day in RepeatDays )

            {

                if(day.ToString().ToLower().Contains(currentDayOfWeek.ToString().ToLower()))

                {

                    Console.WriteLine("Add to calendar -  " +day+ " - "  +CurrentStartDate.ToString());

                }

            }

        }

        }

    }

    internal JObject RepeatEventsDataBuild ( JObject jRepeat , JObject jData )

    {

        JObject rv = new JObject();

        return rv;

    }

    public enum FrequencyType

        {

            None = 0,

            Daily,

            Weekly

        }

    public enum EndRepeatType

        {

            None = 0,

            Repetitions = 1,

            Date = 2

        }

​

}