using Newtonsoft.Json.Linq;
using System.Globalization;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace DS.Module.Core.Extensions;

public static class DateTimeExtension
{
    /// <summary>
    /// 时间戳起始日期
    /// </summary>
    public static readonly DateTime TimestampStart = new(1970, 1, 1, 0, 0, 0, 0);

    /// <summary>
    /// 转换为时间戳
    /// </summary>
    /// <param name="dateTime"></param>
    /// <param name="milliseconds">是否使用毫秒</param>
    /// <returns></returns>
    public static long ToTimestamp(this DateTime dateTime, bool milliseconds = false)
    {
        var timestamp = dateTime.ToUniversalTime() - TimestampStart;
        return (long)(milliseconds ? timestamp.TotalMilliseconds : timestamp.TotalSeconds);
    }

    /// <summary>
    /// 获取周几
    /// </summary>
    /// <param name="datetime"></param>
    /// <returns></returns>
    public static string GetWeekName(this DateTime datetime)
    {
        var day = (int)datetime.DayOfWeek;
        var week = new string[] { "周日", "周一", "周二", "周三", "周四", "周五", "周六" };
        return week[day];
    }
    public static int GetWeekOfYear(this DateTime dt, CultureInfo ci)
    {
        // 获取与当前环境区域性相关的 CultureInfo 对象，或者你可以使用特定的区域性，例如 "zh-CN"
        CultureInfo cultureInfo = new CultureInfo("zh-CN");

        // 从 CultureInfo 对象获取 Calendar 对象
        Calendar calendar = ci.Calendar;

        // 定义 CalendarWeekRule，通常是使用当前文化的 DateTimeFormat
        CalendarWeekRule calendarWeekRule = cultureInfo.DateTimeFormat.CalendarWeekRule;

        // 一周的第一天
        DayOfWeek firstDayOfWeek = cultureInfo.DateTimeFormat.FirstDayOfWeek;

        // 获取指定日期在一年中的周数
        int weekOfYear = calendar.GetWeekOfYear(dt, calendarWeekRule, firstDayOfWeek);
        return weekOfYear;
    }
    /// <summary>
    /// 获取datetime值
    /// </summary>
    /// <param name="jobj"></param>
    /// <param name="prop"></param>
    /// <returns></returns>
    public static DateTime? GetDateTimeValue(this JObject jobj, string prop)
    {
        var jt = jobj[prop];
        if (jt == null)
        {
            return null;
        }

        var strVal = jt.ToString();
        DateTime rtnVal = DateTime.MinValue;
        if (DateTime.TryParse(strVal, out rtnVal))
        {
            return rtnVal;
        }

        return null;
    }
}