using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Ant.ORM
{
    /// <summary>
    /// 关联表
    /// </summary>
    public class MakeJoinTable
    {
        private static object lockHelper = new object();
        private static volatile MakeJoinTable instance = null;
        public List<JoinOnTableNode> RootList = new List<JoinOnTableNode>();
        private JoinOnTableNode item;
        private int i = 0;
        public MakeJoinTable()
        {

        }
        public static MakeJoinTable Instance
        {
            get
            {
                if (instance == null)
                {
                    lock (lockHelper)
                    {
                        if (instance == null)
                        {
                            instance = new MakeJoinTable();
                        }
                    }
                }
                return instance;
            }
        }

        #region IDictionary 成员

        /// <summary>
        /// 左关联查询（左边是主表，右边是关联表）
        /// </summary>
        /// <typeparam name="TM">主表</typeparam>
        /// <typeparam name="TN">次表</typeparam>
        /// <param name="asname">关联表别名</param>
        /// <returns></returns>
        public MakeJoinTable LeftJoin<TM, TN>(string asname)
        {
            item = new JoinOnTableNode();
            item.TableName = typeof(TM).Name;
            item.NTableName = typeof(TN).Name;
            item.NTableAsName = asname;
            item.JoinType = JoinTypes.LeftJoin;
            return this;
        }


        /// <summary>
        /// InnerJoin关联查询（左边是主表，右边是关联表）
        /// </summary>
        /// <typeparam name="TM">主表</typeparam>
        /// <typeparam name="TN">次表</typeparam>
        /// <param name="asname">关联表别名</param>
        /// <returns></returns>
        public MakeJoinTable InnerJoin<TM, TN>(string asname)
        {
            item = new JoinOnTableNode();
            item.TableName = typeof(TM).Name;
            item.NTableName = typeof(TN).Name;
            item.NTableAsName = asname;
            item.JoinType = JoinTypes.Inner;
            return this;
        }


        /// <summary>
        ///  右关联查询（左边是主表，右边是关联表）
        /// </summary>
        /// <typeparam name="TM">主表</typeparam>
        /// <typeparam name="TN">次表</typeparam>
        /// <param name="asname">关联表别名</param>
        /// <returns></returns>
        public MakeJoinTable RihtJoin<TM, TN>(string asname)
        {
            item = new JoinOnTableNode();
            item.TableName = typeof(TM).Name;
            item.NTableName = typeof(TN).Name;
            item.NTableAsName = asname;
            item.JoinType = JoinTypes.RightJoin;
            return this;
        }

        /// <summary>
        /// 关联表条件
        /// </summary>
        /// <param name="mSql">主表关联字段</param>
        /// <param name="nSql">次表关联字段</param>
        /// <returns></returns>
        public MakeJoinTable JoinOn(Enum mSql, Enum nSql)
        {

            item.JoinOn1 = mSql.ToString();
            item.JoinOn2 = nSql.ToString();
            RootList.Add(item);
            return this;
        }



        #endregion

    }

    public class JoinColumn
    {
        private string TableName;
        private int Num;
    }
}