using System;

namespace NzbDrone.Common.Extensions
{
    public static class DateTimeExtensions
    {
        public static bool InNextDays(this DateTime dateTime, int days)
        {
            return InNext(dateTime, new TimeSpan(days, 0, 0, 0));
        }

        public static bool InLastDays(this DateTime dateTime, int days)
        {
            return InLast(dateTime, new TimeSpan(days, 0, 0, 0));
        }

        public static bool InNext(this DateTime dateTime, TimeSpan timeSpan)
        {
            return dateTime >= DateTime.UtcNow && dateTime <= DateTime.UtcNow.Add(timeSpan);
        }

        public static bool InLast(this DateTime dateTime, TimeSpan timeSpan)
        {
            return dateTime >= DateTime.UtcNow.Add(-timeSpan) && dateTime <= DateTime.UtcNow;
        }

        public static bool Before(this DateTime dateTime, DateTime beforeDateTime)
        {
            return dateTime <= beforeDateTime;
        }

        public static bool After(this DateTime dateTime, DateTime afterDateTime)
        {
            return dateTime >= afterDateTime;
        }

        public static bool IsValidDate(this string dateTime)
        {
            DateTime.TryParse(dateTime, out DateTime result);

            return !result.Equals(default(DateTime));
        }

        public static bool IsFutureDate(this string dateTime)
        {
            DateTime.TryParse(dateTime, out DateTime result);

            return !result.Equals(default(DateTime)) && result.After(DateTime.Now);
        }

        public static bool Between(this DateTime dateTime, DateTime afterDateTime, DateTime beforeDateTime)
        {
            return dateTime >= afterDateTime && dateTime <= beforeDateTime;
        }

        public static DateTime EndOfDay(this DateTime date)
        {
            return new DateTime(date.Year, date.Month, date.Day, 23, 59, 59, 999);
        }

        public static DateTime StartOfDay(this DateTime date)
        {
            return new DateTime(date.Year, date.Month, date.Day, 0, 0, 0, 0);
        }

        public static DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
    }
}