namespace YLErp.Modules.DataProviderModule
{
    /// <summary>
    /// 标的信息提供(这个类一般用于结算和涉及到历史数据时的业务)
    /// </summary>
    public class UnderlyingProvider : YLBaseService
    {
        private Dictionary<string, underlying_manager> _underlyingDic;

        public UnderlyingProvider(OptUserInfo userInfo) : base(userInfo)
        {

        }

        public UnderlyingProvider(YLBaseService baseService) : base(baseService)
        {
        }

        /// <summary>
        /// 初始化基础缓存,可以不调用,
        /// 如果涉及到批量处理时调用后提升一定的数据访问性能
        /// </summary>
        public UnderlyingProvider Initialize(DateTime? minMaturityDate)
        {
            var date = (minMaturityDate ?? DateTime.Today).AddDays(-30);
            _underlyingDic = DbContext.underlying_manager.AsNoTracking()
                       .Where(n => n.MaturityDate >= date && n.UnderlyingInstrumentType == ConsGlobal.InstrumentType.CommodityFutures)
                       .ToDictionary(n => n.UnderlyingCode, StringComparer.OrdinalIgnoreCase);
            return this;
        }

        /// <summary>
        /// 数据字典(初始化缓存后累加方式继续积累缓存)
        /// </summary>
        private Dictionary<string, underlying_manager> UnderlyingDic
        {
            get
            {
                return _underlyingDic ?? (_underlyingDic = new Dictionary<string, underlying_manager>(StringComparer.OrdinalIgnoreCase));
            }
        }

        /// <summary>
        /// 根据代码获取标的信息
        /// </summary>
        public underlying_manager GetUnderlying(string underlyingCode)
        {
            if (underlyingCode is null)
            {
                throw new ArgumentNullException(nameof(underlyingCode));
            }

            if (!UnderlyingDic.TryGetValue(underlyingCode, out var underlying))
            {
                UnderlyingDic[underlyingCode] = underlying = DbContext.underlying_manager.AsNoTracking().FirstOrDefault(n => n.UnderlyingCode == underlyingCode);
            }

            return underlying;
        }

        /// <summary>
        /// 返回数据查询接口(现在返回的是EF查询接口)
        /// </summary>
        public IQueryable<underlying_manager> GetUnderlyingQuery()
        {
            return DbContext.underlying_manager.AsNoTracking();
        }
    }
}