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

namespace Lskj.Business.Impl
{
    public class BaseSpecImpl : BaseImpl
    {
        /// <summary>
        /// <para>说明：删除节点</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2018-01-04 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="tableName">Name of the table.</param>
        /// <param name="key">The key.</param>
        /// <param name="value">The value.</param>
        /// <returns>System.Int32.</returns>
        public static int DeleteNode(string tableName, string key, string value)
        {
            string sqlValue = string.Format("delete from {0} where {1}='{2}'", tableName, key, value);

            return ExecSqlValue(sqlValue);
        }
        /// <summary>
        /// <para>说明：获取子节点个数</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2018-01-04 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="tableName">Name of the table.</param>
        /// <param name="key">The key.</param>
        /// <param name="value">The value.</param>
        /// <returns>System.Int32.</returns>
        public static int GetNodeChildCount(string tableName,string key,string value)
        {
            string sqlValue = string.Format("select count(1) from {0} where {1} like '{2}%'", tableName, key, value);
            return Convert.ToInt32(GetResult(sqlValue));
        }
        /// <summary>
        /// <para>说明：获取最大节点号</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2018-01-03 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="tableName">Name of the table.</param>
        /// <param name="parentId">The parent identifier.</param>
        /// <returns>System.String.</returns>
        /// <exception cref="System.NotImplementedException"></exception>
        public static string GetMaxSpeciesNo(string tableName, string parentKey, string parentValue,string firstNode)
        {
            if (string.IsNullOrWhiteSpace(tableName) || string.IsNullOrWhiteSpace(parentKey) || string.IsNullOrWhiteSpace(parentValue))
                return "01";
            string maxdivision = string.Empty;
            string PrefixNum = string.Empty;
            string maxNum = string.Empty;
            for (int i = 0; i < firstNode.Length; i++)
            {
                maxdivision += "_";
                if (i != 0)   PrefixNum += "0";
                maxNum += "9";
            }

            // SpeciesNo是层级编码，完整编码可能超过bigint范围，只对当前节点编号进行数值运算。
            string sqlValue = string.Format("select max(cast(right({1},{4}) as bigint))+1 from {0} where {1} like '{2}{3}'", tableName, parentKey, parentValue, maxdivision, firstNode.Length);
            string maxNo = GetResult(sqlValue) + "";

            if (string.IsNullOrWhiteSpace(maxNo))
                maxNo = parentValue + PrefixNum+"1";
            else
                maxNo = parentValue + maxNo.PadLeft(firstNode.Length, '0');
            maxNo = maxNo.PadLeft(parentValue.Length + firstNode.Length, '0');

            if ((PrefixNum + "0").Equals(maxNo.Substring(maxNo.Length - firstNode.Length)))
            {
                sqlValue = string.Format("select count(1) as cnt from {0} where {1} like '{2}{3}'", tableName, parentKey, parentValue, maxdivision);

                if (GetResult(sqlValue) + "" == maxNum)
                    return maxNum;

                // 取未使用的编号
                sqlValue = string.Format("select cast(right({1},{4}) as bigint) as SpeciesNo from {0} where {1} like '{2}{3}' order by SpeciesNo", tableName, parentKey, parentValue,maxdivision, firstNode.Length);
                DataTable table = GetDataTableResult(sqlValue);

                Int64 speciesNo = table.Rows.Count > 0 ? Convert.ToInt64(table.Rows[0]["SpeciesNo"] + "") : 0;
                if (speciesNo != 1)
                    return parentValue +PrefixNum+"1";;

                foreach (DataRow item in table.Rows)
                {
                    Int64 rowSpeciesNo = Convert.ToInt64(item["SpeciesNo"] + "");
                    if (speciesNo == rowSpeciesNo) continue;

                    if (rowSpeciesNo != speciesNo + 1)
                    {
                        maxNo = parentValue + (speciesNo + 1).ToString().PadLeft(firstNode.Length, '0');

                        break;
                    }

                    speciesNo = rowSpeciesNo;
                }
            }

            return maxNo;
        }
    }
}