using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CP.Common
{
    /// <summary>
    /// 彩种期数计算相关
    /// </summary>
    public class TermUtil
    {
        /// <summary>
        /// 获取下一期号
        /// </summary>
        /// <param name="qi"></param>
        /// <param name="lottery"></param>
        /// <returns></returns>
        public static long GetNextQi(long qi, string lottery)
        {
            long year = qi / 1000;
            long endQi = year * 1000 + 153;
            if (lottery == "3d" || lottery == "p3" || lottery == "hc1")
            {
                endQi = endQi + 205;
                if (2014 == year)//2014年少一期
                { endQi = endQi - 1; }
            }
            if (0 == (year % 4))
            { endQi = endQi + 1; }
            if (qi < endQi)
                return qi + 1;
            return (year + 1) * 1000 + 1;
        }
        /// <summary>
        /// 获取上一期号
        /// </summary>
        /// <param name="qi"></param>
        /// <param name="lottery"></param>
        /// <returns></returns>
        public static long GetLastQi(long qi, string lottery)
        {
            long year = qi / 1000;
            long minQi = year * 1000 + 001;
            long lastQi = qi - 1;
            if (minQi > lastQi)
            {
                year = year - 1;
                long endQi = year * 1000 + 153;
                if (lottery == "3d" || lottery == "p3")
                {
                    endQi = endQi + 205;
                    if (2014 == year)//2014年少一期
                    { endQi = endQi - 1; }
                }
                if (0 == (year % 4))
                { endQi = endQi + 1; }
                lastQi = endQi;
            }
            return lastQi;
        }
        /// <summary>
        /// 获取下一期号限制P3/3D
        /// </summary>
        /// <param name="localQi">必须为最新已开奖的期数</param>
        /// <returns></returns>
        public static long GetLatestQi(long localQi)
        {
            int qi = Convert.ToInt32(localQi);
            if (0 < qi)
            {
                DateTime now = DateTime.Now;
                int year = qi / 1000;
                DateTime sDate = new DateTime(year, 12, 31, 20, 30, 0);
                DateTime eDate = new DateTime(year + 1, 1, 1, 20, 30, 0);
                if (now > sDate && now < eDate)
                {
                    qi = (year + 1) * 1000 + 1;
                }
                else
                {
                    qi = qi + 1;
                }
            }
            return qi;
        }
    }
}