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

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

        }

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


        /// <summary>
        /// 删除品种历史数据
        /// </summary>
        public int RemoveHisData(int varietyId, DateTime valueDate, string valueType)
        {
            if (varietyId < 1)
            {
                return 0;
            }

            valueDate = valueDate.Date;

            var data = DbContext.VarietyHisData.FirstOrDefault(
                n => n.VarietyId == varietyId && n.ValueDate == valueDate && n.ValueType == valueType);

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

            return 0;
        }

        /// <summary>
        /// 更新品种历史数据
        /// </summary>
        public int AddOrUpdateHisData(VarietyHisDataAddOrUpdateRequest req, bool saveChanges = true)
        {
            if (req is null)
            {
                throw new ArgumentNullException(nameof(req));
            }

            if (saveChanges && (req.VarietyId < 1 || !DbContext.variety.Any(n => n.id == req.VarietyId)))
            {
                throw new ServiceException("品种数据 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);
            }

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

            if (hisdata != null)
            {
                var newValue = req.Value;

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

                DbContext.VarietyHisData.Add(hisdata);
            }

            hisdata.Value = req.Value ?? 0;

            SetDBModelOpt(hisdata);

            return saveChanges ? DbContext.SaveChanges() : 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.VarietyHisData
                           where a.ValueDate >= startDate && a.ValueDate <= valueDate
                           group a by new
                           {
                               a.VarietyId,
                               a.ValueType
                           } into aa
                           select new
                           {
                               aa.Key.VarietyId,
                               aa.Key.ValueType,
                               ValueDate = aa.Max(n => n.ValueDate)
                           };

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

            var hisdatas = uhQuery.ToArray();

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

            var sb = new StringBuilder(1000);

            const string sqlfmtMarginRate = "update variety set Margin='{0}' WHERE id='{1}';";
            const string sqlfmtUpDownLimit = "update variety set UpLimit='{0}',DownLimit='{0}' WHERE id='{1}';";
            const string sqlfmtVolatilityRate = "update variety set VolatilityRate='{0}' WHERE id='{1}';";

            foreach (var item in hisdatas)
            {
                switch (item.ValueType)
                {
                    case nameof(MarginParamModel.MarginRate):
                        sb.AppendFormat(sqlfmtMarginRate, item.Value.ToString("0.0#####"), item.VarietyId).AppendLine();
                        break;
                    case nameof(MarginParamModel.UpDownLimit):
                        sb.AppendFormat(sqlfmtUpDownLimit, item.Value.ToString("0.0###%"), item.VarietyId).AppendLine();
                        break;
                    case nameof(MarginParamModel.VolatilityRate):
                        sb.AppendFormat(sqlfmtVolatilityRate, item.Value.ToString("0.0###%"), item.VarietyId).AppendLine();
                        break;
                }
            }

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

    /// <summary>
    /// 
    /// </summary>
    public class VarietyHisDataAddOrUpdateRequest
    {
        public int VarietyId { get; set; }

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

        public DateTime ValueDate { get; set; }

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