using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GPW.CORE.Data
{
    public class Utils
    {
        /// <summary>
        /// Effettua trim di una data al numero di minuti indicato
        /// 
        /// vedere qui:
        /// https://stackoverflow.com/questions/1393696/rounding-datetime-objects
        /// </summary>
        /// <param name="DateOrig">DataOra originale</param>
        /// <param name="roundMin">Minuti di arrotondamento richeisti</param>
        /// <param name="isFloor">Arrotondamento x difetto (floor = true) o eccesso (false)</param>
        /// <returns></returns>
        public static DateTime DateRounded(DateTime DateOrig, int roundMin, bool isFloor)
        {
            long ticks = 0;
            roundMin = roundMin <= 0 ? 1 : roundMin;
            TimeOnly step = new TimeOnly(0, roundMin);
            if (isFloor)
            {
                ticks = DateOrig.Ticks / step.Ticks;
            }
            else
            {
                ticks = (DateOrig.Ticks + step.Ticks - 1) / step.Ticks;
            }
            DateTime answ = new DateTime(ticks * step.Ticks, DateOrig.Kind);
            return answ;
        }
        /// <summary>
        /// Effettua arrotondamento di un timespan ad un dato step di minuti
        /// 
        /// vedere qui:
        /// https://stackoverflow.com/questions/1393696/rounding-datetime-objects
        /// </summary>
        /// <param name="DateOrig">DataOra originale</param>
        /// <param name="roundMin">Minuti di arrotondamento richeisti</param>
        /// <param name="isFloor">Arrotondamento x difetto (floor = true) o eccesso (false)</param>
        /// <returns></returns>
        public static TimeSpan TSpanRounded(TimeSpan TSpanOrig, int roundMin, bool isFloor)
        {
            long ticks = 0;
            roundMin = roundMin <= 0 ? 1 : roundMin;
            TimeOnly step = new TimeOnly(0, roundMin);
            if (isFloor)
            {
                ticks = TSpanOrig.Ticks / step.Ticks;
            }
            else
            {
                ticks = (TSpanOrig.Ticks + step.Ticks - 1) / step.Ticks;
            }
            TimeSpan answ = new TimeSpan(ticks * step.Ticks);
            return answ;
        }

        /// <summary>
        /// Costruisce una riga ripetendo un carattere molte volte
        /// </summary>
        /// <param name="padChar"></param>
        /// <param name="repNum"></param>
        /// <returns></returns>
        public static string charLine(char padChar, int repNum)
        {
            return new string(padChar, repNum);
        }

        /// <summary>
        /// Effettua arrotondamento di un timespan ad un dato step di minuti
        /// 
        /// vedere qui:
        /// https://stackoverflow.com/questions/1393696/rounding-datetime-objects
        /// </summary>
        /// <param name="DateOrig">DataOra originale</param>
        /// <param name="roundMin">Minuti di arrotondamento richeisti</param>
        /// <returns></returns>
        public static TimeSpan TSpanRounded(TimeSpan TSpanOrig, int roundMin)
        {
            long ticks = 0;
            roundMin = roundMin <= 0 ? 1 : roundMin;
            TimeOnly step = new TimeOnly(0, roundMin);
            ticks = (TSpanOrig.Ticks + step.Ticks / 2) / step.Ticks;
            TimeSpan answ = new TimeSpan(ticks * step.Ticks);
            return answ;
        }

        /// <summary>
        /// Inizializzazione con periodo e arrotondamento
        /// </summary>
        /// <param name="minRound"></param>
        /// <returns></returns>
        public static DateTime InitDatetime(DateTime dtRif, int minRound)
        {
            TimeSpan DayElapsed = dtRif.Subtract(dtRif.Date);
            int minDay = (int)Math.Ceiling((double)(DayElapsed.TotalMinutes / minRound)) * minRound;
            DateTime endRounded = DateTime.Today.AddMinutes(minDay);
            return endRounded;
        }
    }
}