using System;
using System.Xml;
using System.Globalization;

namespace Newtonsoft.Json.Utilities
{
  internal static class DateTimeUtils
  {
    public static string GetUtcOffsetText(this DateTime d)
    {
      TimeSpan utcOffset = d.GetUtcOffset();

      return utcOffset.Hours.ToString("+00;-00", CultureInfo.InvariantCulture) + ":" + utcOffset.Minutes.ToString("00;00", CultureInfo.InvariantCulture);
    }

    public static TimeSpan GetUtcOffset(this DateTime d)
    {
#if PocketPC || NET20
      return TimeZone.CurrentTimeZone.GetUtcOffset(d);
#else
      return TimeZoneInfo.Local.GetUtcOffset(d);
#endif
    }

#if !NETFX_CORE
    public static XmlDateTimeSerializationMode ToSerializationMode(DateTimeKind kind)
    {
      switch (kind)
      {
        case DateTimeKind.Local:
          return XmlDateTimeSerializationMode.Local;
        case DateTimeKind.Unspecified:
          return XmlDateTimeSerializationMode.Unspecified;
        case DateTimeKind.Utc:
          return XmlDateTimeSerializationMode.Utc;
        default:
          throw MiscellaneousUtils.CreateArgumentOutOfRangeException("kind", kind, "Unexpected DateTimeKind value.");
      }
    }
#endif
  }
}
