using System;

namespace AsbCloudInfrastructure
{
    public static class DateTimeExtentions
    {
        /// <summary>
        /// Приветсти к UTC из времени куста
        /// </summary>
        /// <param name="date"></param>
        /// <param name="remoteTimezoneOffsetHours"></param>
        /// <returns></returns>
        public static DateTimeOffset ToUtcDateTimeOffset(this DateTime date, double remoteTimezoneOffsetHours)
        {
            if (date == default)
                return new DateTimeOffset();

            var dateUtc = date.Kind switch
            {
                DateTimeKind.Local => date.ToUniversalTime(),
                DateTimeKind.Unspecified => DateTime.SpecifyKind(date.AddHours(-remoteTimezoneOffsetHours), DateTimeKind.Utc),
                _ => date,
            };
            return new DateTimeOffset(dateUtc);
        }

        /// <summary>
        /// Привести ко времени куста из utc
        /// </summary>
        /// <param name="date"></param>
        /// <param name="remoteTimezoneOffsetHours"></param>
        /// <returns></returns>
        public static DateTime ToRemoteDateTime(this DateTimeOffset date, double remoteTimezoneOffsetHours)
        {
            if (date == default)
                return new DateTime(0, DateTimeKind.Unspecified);
            var dateTz = date.ToOffset(TimeSpan.FromHours(remoteTimezoneOffsetHours));
            return dateTz.DateTime;
        }
    }
}