using YLErp.BLL;

namespace YLErp.Modules.ToolsModule
{
    public class EodCommodityFuturePriceService : YLBaseService
    {
        public EodCommodityFuturePriceService(OptUserInfo userInfo) : base(userInfo)
        {
        }

        /// <summary>
        /// 获取收盘价或结算价差值
        /// </summary>
        /// <param name="codes">标的</param>
        /// <param name="date1">日期被减数</param>
        /// <param name="date2">日期减数</param>
        /// <param name="isSettlePrice">
        /// 价格模式
        /// <para>true:结算价</para>
        /// <para>false:收盘价</para>
        /// <para>默认为根据系统设置选择收盘价或结算价</para>
        /// </param>
        /// <returns>
        /// <para>Key:code</para>
        /// <para>Value:差值</para>
        /// </returns>
        public Dictionary<string, double> GetPriceDiff(List<string> codes, DateTime date1, DateTime date2, bool? isSettlePrice = null)
        {
            string date1Str = date1.ToString("yyyyMMdd");
            string date2Str = date2.ToString("yyyyMMdd");
            Dictionary<string, double> result = new Dictionary<string, double>();
            if (codes == null || codes.Count == 0) { return result; }
            if (isSettlePrice == null) { isSettlePrice = valuedateBLL.SystemDate.EodSettlePriceMode == "结算价"; }
            using (YLContext context = new YLContext())
            {
                Dictionary<string, List<eod_commodity_future_price>> dict =
                (from left in (from db in context.eod_commodity_future_price where db.ValueDate == date1 && codes.Contains(db.UnderlyingCode) select db)
                 join right in (from db in context.eod_commodity_future_price where db.ValueDate >= date2 && db.ValueDate < date1 && codes.Contains(db.UnderlyingCode) orderby db.ValueDate descending select db).Take(1)
                 on left.UnderlyingCode equals right.UnderlyingCode into temp
                 from right in temp.DefaultIfEmpty()
                 select new { left, right })
                     .ToDictionary(O => O.left.UnderlyingCode, O => new List<eod_commodity_future_price>() { O.left, O.right });
                for (int i = 0; i < codes.Count; i++)
                {
                    if (!dict.ContainsKey(codes[i]))
                    { result[codes[i]] = 1; continue; }

                    if (isSettlePrice.Value)
                    { result[codes[i]] = dict[codes[i]][0].SettlePrice - ((dict[codes[i]][1]?.SettlePrice) ?? 0); }
                    else { result[codes[i]] = dict[codes[i]][0].ClosePrice - ((dict[codes[i]][1]?.ClosePrice) ?? 0); }
                }
            }

            return result;
        }
    }
}