using System;

namespace MAX.Core.Helpers;

public class DateHelper
{
	/// <summary>
	/// Unix纪元时间
	/// </summary>
	private static readonly DateTime UnixEpoch = new(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

	/// <summary>
	/// 将时间转换为秒级时间戳
	/// </summary>
	/// <param name="dateTime"></param>
	/// <returns></returns>
	public static long GetUnixTimestampInSeconds(DateTime dateTime)
	{
		TimeSpan timeSpan = dateTime.ToUniversalTime() - UnixEpoch;
		return (long)timeSpan.TotalSeconds;
	}

	/// <summary>
	/// 将时间转换为毫秒级时间戳
	/// </summary>
	/// <param name="dateTime"></param>
	/// <returns></returns>
	public static long GetUnixTimestampInMilliseconds(DateTime dateTime)
	{
		TimeSpan timeSpan = dateTime.ToUniversalTime() - UnixEpoch;
		return (long)timeSpan.TotalMilliseconds;
	}

	/// <summary>
	/// 将时间转换为微秒时间戳
	/// </summary>
	/// <param name="dateTime"></param>
	/// <returns></returns>
	public static long GetUnixTimestampInMicroseconds(DateTime dateTime)
	{
		long us = dateTime.ToUniversalTime().Ticks - UnixEpoch.Ticks;
		return us;
	}
	/// <summary>
	/// 将时间Ticks转换为毫微秒时间戳
	/// </summary>
	/// <param name="dateTime"></param>
	/// <returns></returns>
	public static long GetUnixTimestampInMicroseconds(long ticks)
	{
		long us = ticks - UnixEpoch.Ticks;
		return us;
	}

	/// <summary>
	/// 将秒级时间戳转换为时间
	/// </summary>
	/// <param name="timestamp"></param>
	/// <returns></returns>
	public static DateTime ConvertFromUnixTimestampInSeconds(long timestamp)
	{
		return UnixEpoch.AddSeconds(timestamp).ToLocalTime();
	}

	/// <summary>
	/// 将毫秒级时间戳转换为时间
	/// </summary>
	/// <param name="timestamp"></param>
	/// <returns></returns>
	public static DateTime ConvertFromUnixTimestampInMilliseconds(long timestamp)
	{
		return UnixEpoch.AddMilliseconds(timestamp).ToLocalTime();
	}
	/// <summary>
	/// 将微秒级时间戳转换为时间
	/// </summary>
	/// <param name="timestamp"></param>
	/// <returns></returns>
	public static DateTime ConvertFromUnixTimestampInMicroseconds(long timestamp)
	{
		long us = timestamp + UnixEpoch.Ticks;
		return new DateTime(us);
	}
	/// <summary>
	/// 获取当前时间的秒级时间戳
	/// </summary>
	/// <returns></returns>
	public static long GetCurrentUnixTimestampInSeconds()
	{
		return GetUnixTimestampInSeconds(DateTime.UtcNow);
	}

	/// <summary>
	/// 获取当前时间的毫秒级时间戳
	/// </summary>
	/// <returns></returns>
	public static long GetCurrentUnixTimestampInMilliseconds()
	{
		return GetUnixTimestampInMilliseconds(DateTime.UtcNow);
	}

	/// <summary>
	/// 获取当前时间的微秒级时间戳
	/// </summary>
	/// <returns></returns>
	public static long GetCurrentUnixTimestampInMicroseconds()
	{
		return GetUnixTimestampInMicroseconds(DateTime.UtcNow);
	}
}