using System;
using ReflectionMagic;

namespace AMWD.Common.Tests.Utils
{
	[System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
	internal class TimeZoneInfoLocalMock : IDisposable
	{
		private readonly TimeZoneInfo _localTimeZoneInfo;

		private TimeZoneInfoLocalMock(TimeZoneInfo timeZoneInfo)
		{
			_localTimeZoneInfo = TimeZoneInfo.Local;
			SetLocalTimeZone(timeZoneInfo);
		}

		public static IDisposable Create(TimeZoneInfo mockTimeZoneInfo)
			=> new TimeZoneInfoLocalMock(mockTimeZoneInfo);

		public void Dispose()
			=> SetLocalTimeZone(_localTimeZoneInfo);

		private static void SetLocalTimeZone(TimeZoneInfo timeZoneInfo)
			=> typeof(TimeZoneInfo).AsDynamicType().s_cachedData._localTimeZone = timeZoneInfo;
	}
}