using YLErp.Modules.EodModule;

namespace YLErp.Modules.TradeRiskCalcModule
{
    /// <summary>
    /// 初始累计盈亏数据源
    /// </summary>
    class AccruedTotalPnlStartingDataSource<TEntity>
        where TEntity : EodTradePosition
    {
        IEnumerable<TradePnlStatics> _list;

        private AccruedTotalPnlStartingDataSource()
        {

        }

        /// <summary>
        /// 取值日
        /// </summary>
        public DateTime ValueDate { get; private set; }

        /// <summary>
        /// 起算日
        /// </summary>
        public DateTime StartDate { get; private set; }

        public void Reset()
        {
            _list = null;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="valueDate">取值日</param>
        /// <param name="startDate">起算日</param>
        public IEnumerable<TradePnlStatics> GetDatas(DateTime valueDate, DateTime startDate)
        {
            valueDate = valueDate.Date;
            startDate = startDate.Date;
            if (_list != null && ValueDate == valueDate && StartDate == startDate)
            {
                return _list;
            }
            ValueDate = valueDate;
            StartDate = startDate;
            return _list = new AccruedTotalPnlService<TEntity>(OptUserInfo.SystemUser).GetAccruedStartPnls(startDate, true);
        }

        public static readonly AccruedTotalPnlStartingDataSource<TEntity> Default;

        static AccruedTotalPnlStartingDataSource()
        {
            Default = new AccruedTotalPnlStartingDataSource<TEntity>();
        }
    }
}