using System.Text;
using YLErp.BLL;
using YLErp.Models;

namespace YLErp.Modules.UnderlyingModule
{
    public class UnderlyingHisDataService : YLBaseService
    {
        public UnderlyingHisDataService(OptUserInfo userInfo) : base(userInfo)
        {

        }

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

        /// <summary>
        /// 更新标的历史数据
        /// </summary>
        public int AddOrUpdateHisData(UnderlyingHisDataAddOrUpdateRequest req, bool saveChanges = true)
        {
            if (req is null)
            {
                throw new ArgumentNullException(nameof(req));
            }

            if (string.IsNullOrWhiteSpace(req.UnderlyingCode))
            {
                throw new ServiceException("标的代码 必须有值");
            }

            if (saveChanges && !DbContext.underlying_manager.Any(n => n.UnderlyingCode == req.UnderlyingCode))
            {
                throw new ServiceException("标的数据 不存在");
            }

            switch (req.ValueType)
            {
                case nameof(MarginParamModel.MarginRate):
                case nameof(MarginParamModel.UpDownLimit):
                case nameof(MarginParamModel.VolatilityRate): break;
                default: throw new ServiceException("ValueType 不支持:" + req.ValueType);
            }

            if (string.IsNullOrWhiteSpace(req.ValueFlag))
            {
                req.ValueFlag = "F";
            }
            else if (req.ValueFlag != "F" && req.ValueFlag != "%")
            {
                throw new ServiceException("ValueFlag 不支持");
            }

            var hisdata = DbContext.UnderlyingHisData.OrderByDescending(n => n.ValueDate).FirstOrDefault(
                    n => n.UnderlyingCode == req.UnderlyingCode && n.ValueDate <= req.ValueDate && n.ValueType == req.ValueType);

            if (hisdata != null)
            {
                //如果新值和旧值一致则不需要处理
                var newValue = req.Value;
                if (newValue.HasValue && Math.Abs(newValue.Value - hisdata.Value) < 1e-6)
                {
                    return 0;
                }

                //新值为null并且为第一条时清掉
                if (!newValue.HasValue && hisdata.ValueDate == req.ValueDate
                    && !DbContext.UnderlyingHisData.Any(n => n.UnderlyingCode == req.UnderlyingCode && n.ValueDate < req.ValueDate && n.ValueType == req.ValueType))
                {
                    DbContext.UnderlyingHisData.Remove(hisdata);
                    return saveChanges ? DbContext.SaveChanges() : 0;
                }
            }
            else if (!req.Value.HasValue)
            {
                return 0; //如果没有历史数据并且新值为null
            }

            if (hisdata == null || hisdata.ValueDate < req.ValueDate)
            {
                hisdata = new UnderlyingHisData
                {
                    UnderlyingCode = req.UnderlyingCode,
                    ValueDate = req.ValueDate,
                    ValueType = req.ValueType
                };

                DbContext.UnderlyingHisData.Add(hisdata);
            }

            SetDBModelOpt(hisdata);

            hisdata.Value = req.Value ?? 0;

            hisdata.ValueFlag = req.Value.HasValue ? req.ValueFlag : "N";

            return saveChanges ? DbContext.SaveChanges() : 0;
        }

        /// <summary>
        /// 删除标的历史数据
        /// </summary>
        public int RemoveHisData(string underlyingCode, DateTime valueDate, string valueType)
        {
            if (string.IsNullOrWhiteSpace(underlyingCode) || string.IsNullOrWhiteSpace(valueType))
            {
                return 0;
            }

            valueDate = valueDate.Date;

            var data = DbContext.UnderlyingHisData.FirstOrDefault(
                n => n.UnderlyingCode == underlyingCode && n.ValueDate == valueDate && n.ValueType == valueType);

            if (data != null)
            {
                DbContext.UnderlyingHisData.Remove(data);
                return DbContext.SaveChanges();
            }

            return 0;
        }

        /// <summary>
        /// 回写历史数据到主表
        /// </summary>
        public int BackHisDataToMainTable()
        {
            var db = DbContextFactory.GetYLDbContext();
            var valueDate = valuedateBLL.ValueDate;
            var startDate = valuedateBLL.ValueDate.AddDays(-3);
            var uhgQuery = from a in db.UnderlyingHisData
                           where a.ValueDate >= startDate && a.ValueDate <= valueDate
                           group a by new
                           {
                               a.UnderlyingCode,
                               a.ValueType
                           } into aa
                           select new
                           {
                               aa.Key.UnderlyingCode,
                               aa.Key.ValueType,
                               ValueDate = aa.Max(n => n.ValueDate)
                           };

            var uhQuery = from a in uhgQuery
                          join b in db.UnderlyingHisData on new { a.UnderlyingCode, a.ValueType, a.ValueDate } equals new { b.UnderlyingCode, b.ValueType, b.ValueDate }
                          select new
                          {
                              b.UnderlyingCode,
                              b.Value,
                              b.ValueType,
                              b.ValueFlag
                          };

            var hisdatas = uhQuery.ToArray();

            if (!hisdatas.Any())
            {
                return 0;
            }

            var sb = new StringBuilder(1000);

            const string sqlfmtMarginRate = "update underlying_manager set MarginRate='{0}' WHERE UnderlyingCode='{1}';";
            const string sqlfmtUpDownLimit = "update underlying_manager set UpDownLimit='{0}' WHERE UnderlyingCode='{1}';";
            const string sqlfmtVolatilityRate = "update underlying_manager set VolatilityRate='{0}' WHERE UnderlyingCode='{1}';";

            //new underlying_manager().MarginRate;

            foreach (var item in hisdatas)
            {
                switch (item.ValueType)
                {
                    case nameof(MarginParamModel.MarginRate):
                        if (item.ValueFlag == "N")
                        {
                            sb.AppendFormat("update underlying_manager set MarginRate=null WHERE UnderlyingCode='{0}';", item.UnderlyingCode).AppendLine();
                        }
                        else
                        {
                            sb.AppendFormat(sqlfmtMarginRate, item.Value.ToString("0.0#####"), item.UnderlyingCode).AppendLine();
                        }
                        break;
                    case nameof(MarginParamModel.UpDownLimit):
                        var fmt = item.ValueFlag == "%" ? "0.0###%" : "0.0#####";
                        sb.AppendFormat(sqlfmtUpDownLimit, item.ValueFlag == "N" ? "" : item.Value.ToString(fmt), item.UnderlyingCode).AppendLine();
                        break;
                    case nameof(MarginParamModel.VolatilityRate):
                        sb.AppendFormat(sqlfmtVolatilityRate, item.ValueFlag == "N" ? "" : item.Value.ToString("0.0###%"), item.UnderlyingCode).AppendLine();
                        break;
                }
            }

            var sql = sb.ToString();
            LogFactory.GetLogger("回写标的历史数据到主表").Info(sql);
            return DbContext.Database.ExecuteSqlRaw(sql);
        }
    }

    /// <summary>
    /// 
    /// </summary>
    public class UnderlyingHisDataAddOrUpdateRequest
    {
        public string UnderlyingCode { get; set; }

        /// <summary>
        /// 使用MarginParamModel的属性字段
        /// </summary>
        public string ValueType { get; set; }

        public string ValueFlag { get; set; }

        public DateTime ValueDate { get; set; }

        public double? Value { get; set; }
    }
}