using System;

namespace LCU.Library.Internal.IncentiveApiModels.Common
{
    public sealed class MonthRange
    {
        public int FromMonth { get; }
        public int FromYear { get; }
        public int ToMonth { get; }
        public int ToYear { get; }

        public MonthRange()
        {
            var today = DateTime.Today;
            FromMonth = today.Month;
            ToMonth = today.Month;
            FromYear = today.Year;
            ToYear = today.Year;
        }

        public MonthRange(DateTime period)
        {
            FromMonth = period.Month;
            ToMonth = period.Month;
            FromYear = period.Year;
            ToYear = period.Year;
        }

        public MonthRange(DateTime fromPeriod, DateTime toPeriod)
        {
            FromMonth = fromPeriod.Month;
            ToMonth = toPeriod.Month;
            FromYear = fromPeriod.Year;
            ToYear = toPeriod.Year;
        }

        public MonthRange(int year, int month)
        {
            if (year < 1900 || month > 12)
            {
                throw new Exception("First Argument is Year, not month");
            }
            FromMonth = month;
            ToMonth = month;
            FromYear = year;
            ToYear = year;
        }

        public MonthRange(int fromYear, int fromMonth, int toYear, int toMonth)
        {
            if (fromYear < 1900 || fromMonth > 12 || toYear < 1900 || toMonth > 12)
            {
                throw new Exception("Year arguments are first, they are likely swapped.");
            }
            FromMonth = fromMonth;
            ToMonth = toMonth;
            FromYear = fromYear;
            ToYear = toYear;
        }

        public bool IsSingleMonth => FromMonth == ToMonth && FromYear == ToYear;

        public DateTime StartTime => new DateTime(FromYear, FromMonth, 1);
        public DateTime EndTime => new DateTime(ToYear, ToMonth, 1).AddMonths(1).AddSeconds(-1);
        public bool ValidFromRange => FromMonth != 0 && FromYear != 0;
        public bool ValidToRange => ToMonth != 0 && ToYear != 0;
    }
}