using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace EShang.Common
{
    /// <summary>
    /// 数据表创建类
    /// </summary>
    public class CreateTableHelper
    {
        /// <summary>
        /// 创建服务区分表
        /// </summary>
        /// <param name="oracleHelper">数据库连接类</param>
        /// <param name="ownerName">表所有者名称</param>
        /// <param name="tableName">主表名称</param>
        /// <param name="indexNamePrefix">索引前缀</param>
        /// <param name="serverPartCodeList">服务区编码列表</param>
        /// <param name="tableIndexColumnList">索引字段列表</param>
        /// <returns></returns>
        public static bool CreateTable(OracleHelper oracleHelper, string ownerName, string tableName,
            string indexNamePrefix, List<string> serverPartCodeList, List<string> tableIndexColumnList)
        {
            if (oracleHelper == null || string.IsNullOrWhiteSpace(ownerName) ||
                string.IsNullOrWhiteSpace(tableName) || string.IsNullOrWhiteSpace(indexNamePrefix) ||
                serverPartCodeList.Count == 0 || tableIndexColumnList.Count == 0)
            {
                return false;
            }
            System.Data.DataTable _ConstraintTable = oracleHelper.ExcuteSqlGetDataSet(
                $@"SELECT A.OWNER,A.TABLE_NAME,A.CONSTRAINT_NAME,
	                CASE A.CONSTRAINT_TYPE WHEN 'P' THEN ' PRIMARY KEY (' ELSE ' UNIQUE (' END || 
                    WM_CONCAT(B.COLUMN_NAME) || ') USING INDEX' AS COLUMN_NAME
                FROM SYS.ALL_CONSTRAINTS A,SYS.ALL_CONS_COLUMNS B
                WHERE A.OWNER = B.OWNER AND A.TABLE_NAME = B.TABLE_NAME AND 
                    A.CONSTRAINT_NAME = B.CONSTRAINT_NAME AND A.OWNER = '{ownerName}' AND 
	                A.TABLE_NAME = '{tableName}' AND A.CONSTRAINT_TYPE IN ('P','U')
                GROUP BY A.OWNER,A.TABLE_NAME,A.CONSTRAINT_NAME,A.CONSTRAINT_TYPE").Tables[0];
            List<string> _SQLList = new List<string>();
            foreach (string _strServerPartCode in serverPartCodeList)
            {
                _SQLList.Add($@"CREATE TABLE {ownerName}.{tableName}_{_strServerPartCode} AS 
                    SELECT * FROM {ownerName}.{tableName} WHERE 1 = 2 ");
                _SQLList.Add($@"CREATE INDEX {ownerName}.INDEX_{indexNamePrefix}_{_strServerPartCode} 
                    ON {ownerName}.{tableName}_{_strServerPartCode} ( {string.Join(",", tableIndexColumnList.ToArray())} )");
                foreach (System.Data.DataRow _DataRow in _ConstraintTable.Rows)
                {
                    _SQLList.Add($@"ALTER TABLE {ownerName}.{tableName}_{_strServerPartCode}  
                        ADD CONSTRAINT {_DataRow["CONSTRAINT_NAME"].ToString()}_{_strServerPartCode} 
                        {_DataRow["COLUMN_NAME"].ToString()} ");
                }
            }
            if (_SQLList.Count > 0)
            {
                oracleHelper.ExecuteSqlTran(_SQLList);
            }
            return true;
        }
    }
}