using System;
using UnityEngine;

public class TimeTool
{
    public static TimeSpan GetNowTimeSpan()
    {
        return DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
    }

    public static TimeSpan GetGameRunTimeSpan()
    {
        return GetGameRunTimeSpan((int)Time.realtimeSinceStartup);
    }

    public static TimeSpan GetGameRunTimeSpan(int runTime)
    {
        int hour = runTime / 3600;
        int minute = (runTime - (hour * 3600)) / 60;
        int second = runTime - (hour * 3600) - (minute * 60);
#if UNITY_EDITOR
        Debug.Log($"get TimeSpan hour : {hour} minute : {minute} second : {second}");
#endif
        return new TimeSpan(hour, minute, second);
    }

    /// <summary>  
    /// 获取当前时间戳  
    /// </summary>  
    /// <param name="bflag">为真时获取10位时间戳,为假时获取13位时间戳.bool bflag = true</param>  
    /// <returns></returns>  
    public static long GetTimeStamp(bool notMill)
    {
        TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        if (notMill)
            return Convert.ToInt64(ts.TotalSeconds);
        else
            return Convert.ToInt64(ts.TotalMilliseconds);
    }

    public static DateTime GetCurrDateTime(long timeStamp)
    {
        DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1)); // 当地时区
        return startTime.AddTicks(timeStamp * 10000000);
    }


    /// <summary>
    /// 时间戳转化为本地时间
    /// </summary>
    /// <param name="timeStamp"></param>
    /// <param name="notMill"></param>
    /// <returns></returns>
    public static string GetFormatTime(long timeStamp, bool notMill)
    {
        DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1)); // 当地时区
        DateTime dataTime = startTime.AddTicks(timeStamp * 10000000);
        if (notMill)
        {
            return dataTime.ToString("yyyy-MM-dd HH:mm:ss");
        }
        else
        {
            return dataTime.ToString("yyyy-MM-dd HH:mm:ss fff");
        }
    }

    public static int GetCurrDayOfYear()
    {
        return DateTime.Today.DayOfYear;
    }

    /// <summary>
    /// 获取当前是一年当中的第几周
    /// </summary>
    /// <returns></returns>
    public static int GetCurrWeekOfYear()
    {
        //一.找到第一周的最后一天（先获取1月1日是星期几，从而得知第一周周末是几）
        int firstWeekend = 7 - Convert.ToInt32(DateTime.Parse(DateTime.Today.Year + "-1-1").DayOfWeek);

        //二.获取今天是一年当中的第几天
        int currentDay = DateTime.Today.DayOfYear;

        //三.（今天 减去 第一周周末）/7 等于 距第一周有多少周 再加上第一周的1 就是今天是今年的第几周了
        //    刚好考虑了惟一的特殊情况就是，今天刚好在第一周内，那么距第一周就是0 再加上第一周的1 最后还是1
        return Convert.ToInt32(Math.Ceiling((currentDay - firstWeekend) / 7.0)) + 1;
    }
}