using System;

namespace LCU.API.Internal.Operations.IncentiveApiLib.Persistence;

public class DateTimeService : IDateTime
{
    public DateTime Now => DateTime.Now;
    public DateTime UTCNow => DateTime.UtcNow;
    public DateTime ConvertDnaUnspecifiedTimeToUtc(DateTime dateTime) {
        var dnaAssumedTimeZone = TimeZoneConverter.TZConvert.GetTimeZoneInfo("America/Chicago");
        return TimeZoneInfo.ConvertTime(dateTime, dnaAssumedTimeZone, TimeZoneInfo.Utc);
    }

    public DateTime? CSTWindowsNow
    {
        get
        {
            try
            {
                var centralTimeZone = TimeZoneConverter.TZConvert.GetTimeZoneInfo("Central Standard Time");
                return TimeZoneInfo.ConvertTimeFromUtc(UTCNow, centralTimeZone);
            }
            catch (Exception)
            {
                return null;
            }
        }
    }

    public DateTime? CSTLinuxNow
    {
        get
        {
            try
            {
                var centralTimeZone = TimeZoneConverter.TZConvert.GetTimeZoneInfo("America/Chicago");
                return TimeZoneInfo.ConvertTimeFromUtc(UTCNow, centralTimeZone);
            }
            catch (Exception)
            {
                return null;
            }
        }
    }

    public DateTime ConvertDateTimeFromCSTToUTCLinux(string dateTimeString)
    {
        var date = DateTime.Parse(dateTimeString);
        return TimeZoneInfo.ConvertTime(date, TimeZoneConverter.TZConvert.GetTimeZoneInfo("America/Chicago"), TimeZoneInfo.Utc);
    }
    public DateTime ConvertDateTimeFromCSTToUTCWindows(string dateTimeString)
    {
        var date = DateTime.Parse(dateTimeString);
        return TimeZoneInfo.ConvertTime(date, TimeZoneConverter.TZConvert.GetTimeZoneInfo("Central Standard Time"), TimeZoneInfo.Utc);
    }

    public DateTime getNextBonusPeriod(DateTime today)
    {
        var seedDate = new DateTime(2021, 10, 01);
        while (seedDate.Date <= today.Date || PayPeriodInMonth(seedDate) != 2)
        {
            seedDate = seedDate.AddDays(14);
        }
        return seedDate;
    }

    private int PayPeriodInMonth(DateTime input)
    {
        var period = 1;
        var previousPayDay = input.AddDays(-14);
        if (previousPayDay.Month == input.Month)
        {
            period = 2;
        }
        previousPayDay = previousPayDay.AddDays(-14);
        if (previousPayDay.Month == input.Month)
        {
            period = 3;
        }

        return period;
    }
}