using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using RDH.Data.BLL;
using RDH.Data.Models;

namespace RDH.Data
{
    /// <summary>
    /// 表示具有快照表的持久层基础类
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public abstract class BaseOrclSnapshotBLL<T> : BaseOrclBLL<T>, ISnapshotBLL<T>
        where T : BaseModel
    {
        public BaseOrclSnapshotBLL() : base()
        {
        }
        protected virtual String BuildInsertSnapshotSql()
        {
            StringBuilder builder = new StringBuilder();
            builder.AppendFormat("INSERT INTO {0}(", this.TABLE_NAME + "_BASE");
            foreach (var c in ColumnPropMaps)
            {
                builder.AppendFormat("{0},", c.Key);
            }
            //根据参数值添加数据
            //builder.Append("SNAPSHOT_KEY) VALUES(");
            //foreach (var c in ColumnPropMaps)
            //{
            //    builder.AppendFormat(":{0},", c.Value);
            //}
            //builder.Append(":SnapshotKey)");
            //根据表中数据添加
            builder.Remove(builder.Length - 1, 1);
            builder.Append(") SELECT ");
            foreach (var c in ColumnPropMaps)
            {
                //if (c.Key == "CREATE_TIME")
                //{
                //    builder.Append("SYSDATE,");
                //}
                //else 
                //{
                //    builder.AppendFormat("{0},", c.Key);
                //}
                builder.AppendFormat("{0},", c.Key);
            }
            builder.Remove(builder.Length - 1, 1);
            builder.AppendFormat(" FROM {0} WHERE {1}=:{2}",
                this.TABLE_NAME,
                this.KEY_COLUMN,
                this.ColumnPropMaps[this.KEY_COLUMN]);
            return builder.ToString();
        }

        public virtual void UpdateCurrent(T v)
        {
            Object tempParam = GetParam(v);
            SqlMapper.Execute(ConnectionFactory.Current.GetSessionConnection(),
                BuildInsertSnapshotSql(),
                tempParam);
            v.CreateTime = DateTime.Now;
            tempParam = GetParam(v);
            SqlMapper.Execute(ConnectionFactory.Current.GetSessionConnection(),
                BuildUpdateSql(),
                tempParam);
        }

        public virtual void DeleteCurrent(T v)
        {
            Object tempParam = GetParam(v);
            SqlMapper.Execute(ConnectionFactory.Current.GetSessionConnection(),
                BuildInsertSnapshotSql(),
                tempParam);
            SqlMapper.Execute(ConnectionFactory.Current.GetSessionConnection(),
                BuildDeleteSql(),
                tempParam);
        }
        internal String BuildLastDataQueryByHistory(DateTime endDate, String partitionKey)
        {
            StringBuilder builder = new StringBuilder();
            builder.Append("SELECT ");
            foreach (KeyValuePair<String, String> pair in this.ColumnPropMaps)
            {
                builder.AppendFormat("t4.{0},", pair.Key, pair.Value);
            }
            builder.Remove(builder.Length - 1, 1);
            builder.AppendFormat(" FROM (SELECT ROW_NUMBER() OVER(PARTITION BY t3.{0} ORDER BY t3.create_time DESC) AS R,",
                String.IsNullOrEmpty(partitionKey) ? "key" : partitionKey);
            foreach (KeyValuePair<String, String> pair in this.ColumnPropMaps)
            {
                builder.AppendFormat("t3.{0},", pair.Key);
            }
            builder.Remove(builder.Length - 1, 1);
            builder.Append(" FROM (SELECT ");
            foreach (KeyValuePair<String, String> pair in this.ColumnPropMaps)
            {
                builder.AppendFormat("t1.{0},", pair.Key);
            }
            builder.Remove(builder.Length - 1, 1);
            builder.AppendFormat(" FROM {0} t1 "
                + " WHERE t1.create_time<TO_DATE('{1}', 'yyyy-mm-dd')"
                + " UNION SELECT ",
                this.TABLE_NAME, endDate.ToString("yyyy-MM-dd"));
            foreach (KeyValuePair<String, String> pair in this.ColumnPropMaps)
            {
                builder.AppendFormat("t2.{0},", pair.Key);
            }
            builder.Remove(builder.Length - 1, 1);
            builder.AppendFormat(" FROM {0}_BASE t2"
                + " WHERE t2.create_time<TO_DATE('{1}', 'yyyy-mm-dd')) t3) t4"
                + " WHERE t4.R=1",
                this.TABLE_NAME, endDate.ToString("yyyy-MM-dd"));
            return builder.ToString();
        }
    }
}