using System.Collections.Concurrent;
using YLErp.Abstract;
using YLErp.Modules.ExchangeOptionTradeModule;

namespace YLErp.Modules.DataProviderModule
{
    /// <summary>
    /// 场内期权保存波动率提供
    /// </summary>
    public class ExOptionSavedVolProvider : IDataUpdater, IJsonSerializable
    {
        readonly DateTime _valueDate;
        //使用场内期权代码做为主键
        readonly ConcurrentDictionary<string, double?> _dic;
        //业务操作上来说，旧的波动率不会再变更
        readonly ConcurrentDictionary<string, double?> _dicOld;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="valueDate">当前结算日期</param>
        public ExOptionSavedVolProvider(DateTime valueDate)
        {
            _valueDate = valueDate;
            _dic = new ConcurrentDictionary<string, double?>();
            _dicOld = new ConcurrentDictionary<string, double?>();
        }

        public string TableName => nameof(ExchangeOptionVol);

        /// <summary>
        /// 获取交易波动率
        /// </summary>
        public double? GetSavedVol(string optionCode, DateTime valueDate)
        {
            var dic = valueDate < _valueDate ? _dicOld : _dic;
            if (!dic.TryGetValue(optionCode, out var vol))
            {
                vol = new ExchangeOptionVolQueryService(OptUserInfo.SystemUser).GetSavedVol(optionCode, valueDate);
                dic.AddOrUpdate(optionCode, vol, (n, m) => vol);
            }
            return vol;
        }

        /// <summary>
        /// 更新数据--keyid为optionCode
        /// </summary>
        public void UpdateData(IEnumerable<string> updateKeyIds)
        {
            foreach (var optionCode in updateKeyIds)
            {
                if (optionCode != null)
                {
                    _dic.TryRemove(optionCode, out _);
                }
            }
        }

        public string ToJson()
        {
            return new { _valueDate, _dic, _dicOld }.ToJson();
        }
    }
}