using System.Data;
using Dapper;
using System;
using System.Data.SqlClient;
using Vit.Extensions;
using Vit.Core.Module.Log;
using Vit.Orm.Dapper;

namespace Vit.Db.DbMng.Extendsions
{
    public static partial class IDbConnection_MsSqlExtensions
    {
        /*
 --------------------------------------------------------------------------------------
先读后写

declare @fileContent varbinary(MAX);

select @fileContent=BulkColumn  from OPENROWSET(BULK 'T:\机电合并.zip', SINGLE_BLOB) as content;

if Exists(select top 1 * from sysObjects where Id=OBJECT_ID(N'sqler_temp_filebuffer') and xtype='U')
	drop table sqler_temp_filebuffer;

select @fileContent as fileContent into sqler_temp_filebuffer;


exec master..xp_cmdshell 'bcp "select null union all select ''0'' union all select ''0'' union all select null union all select ''n'' union all select null " queryout "T:\file.fmt" /T /c'



exec master..xp_cmdshell 'BCP "SELECT fileContent FROM sqler_temp_filebuffer" queryout "T:\file.zip" -T -i "T:\file.fmt"'



if Exists(select top 1 * from sysObjects where Id=OBJECT_ID(N'sqler_temp_filebuffer') and xtype='U')
	drop table sqler_temp_filebuffer;             
             
             */

        #region MsSql_ReadFileFromDisk    
        /// <summary>
        /// 从磁盘读取文件内容
        /// </summary>
        /// <param name="conn"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static byte[] MsSql_ReadFileFromDisk(this IDbConnection conn, string filePath)
        {
            /*        select BulkColumn  from OPENROWSET(BULK N'T:\机电合并.zip', SINGLE_BLOB) as content;                 
             */
            return conn.MsSql_RunUseMaster((c) =>
            {
                return conn.ExecuteScalar<byte[]>(
                " select BulkColumn  from OPENROWSET(BULK N'"+ filePath + "', SINGLE_BLOB) as content"
                ,commandTimeout: DapperConfig.CommandTimeout);
            });
        }
        #endregion


        #region MsSql_DeleteFileFromDisk    
        /// <summary>
        /// 从磁盘删除文件
        /// </summary>
        /// <param name="conn"></param>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static void MsSql_DeleteFileFromDisk(this IDbConnection conn, string filePath)
        {            
            conn.MsSql_Cmdshell("del \""+ filePath + "\"");
        }
        #endregion



        #region MsSql_WriteFileToDisk    
        /// <summary>
        /// 写入文件到磁盘
        /// </summary>
        /// <param name="conn"></param>
        /// <param name="filePath"></param>
        /// <param name="fileContent"></param>
        public static void MsSql_WriteFileToDisk(this IDbConnection conn, string filePath,byte[]fileContent)
        {
            string fmtFilePath = filePath + ".sqler.temp.fmt";

            conn.MsSql_Cmdshell(runCmd => {

                #region (x.1)把文件内容写入到临时表
                conn.Execute(@"
if Exists(select top 1 * from sysObjects where Id=OBJECT_ID(N'sqler_temp_filebuffer') and xtype='U')
	drop table sqler_temp_filebuffer;
select @fileContent as fileContent into sqler_temp_filebuffer;
",new { fileContent }, commandTimeout: DapperConfig.CommandTimeout);
                #endregion

                try
                {

                    #region (x.2)写入二进制文件到磁盘
                    var log1 = runCmd("bcp \"select null union all select '0' union all select '0' union all select null union all select 'n' union all select null \" queryout \""+ fmtFilePath + "\" /T /c");
                    Logger.Info("[sqler]-MsSqlMng 写入文件到磁盘. 创建fmt文件，outlog: " + log1.Serialize());

                    var log2 = runCmd("BCP \"SELECT fileContent FROM sqler_temp_filebuffer\" queryout \"" + filePath + "\" -T -i \"" + fmtFilePath + "\"");
                    Logger.Info("[sqler]-MsSqlMng 写入文件到磁盘.创建文件，outlog: " + log2.Serialize());

                    #endregion

                }
                finally
                {
                    //(x.1)删除fmt文件
                    try
                    {
                        runCmd("del \"" + fmtFilePath + "\"");
                    }
                    catch (Exception ex)
                    {
                        Logger.Error(ex);
                    }

                    //(x.2)删除临时表
                    conn.Execute(@"
if Exists(select top 1 * from sysObjects where Id=OBJECT_ID(N'sqler_temp_filebuffer') and xtype='U')
	drop table sqler_temp_filebuffer;
", commandTimeout: DapperConfig.CommandTimeout);
                }

            });

        }
        #endregion




        #region MsSql_RunUseMaster
        public static T MsSql_RunUseMaster<T>(this IDbConnection conn, Func<IDbConnection, T> run)
        {
            string oriConnectionString = conn.ConnectionString;
            try
            {
                SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder(oriConnectionString);
                builder.InitialCatalog = "";
                conn.ConnectionString = builder.ToString();
                return run(conn);
            }
            finally
            {
                conn.ConnectionString = oriConnectionString;
            }
        }
        #endregion




        #region MsSql_Cmdshell
        public static DataTable MsSql_Cmdshell(this IDbConnection conn, string cmd)
        {
            DataTable dt = null;
            conn.MsSql_Cmdshell( runCmd=>  dt = runCmd(cmd)   );
            return dt;
        }

        public static void MsSql_Cmdshell(this IDbConnection conn, Action<Func<string,DataTable>> handleToRun)
        {            
            conn.MsSql_RunUseMaster((c)=> {

                bool advancedOptionsIsOpened = false;
                try
                {
                    advancedOptionsIsOpened = c.ExecuteDataTable("EXEC SP_CONFIGURE 'show advanced options'").Rows[0]["config_value"]?.Convert<string>() != "0";
                }
                catch (Exception)
                {
                }

                bool cmdshellIsOpened = false;
                try
                {
                    cmdshellIsOpened = c.ExecuteDataTable("EXEC SP_CONFIGURE 'xp_cmdshell'").Rows[0]["config_value"]?.Convert<string>() != "0";
                }
                catch (Exception)
                {                     
                }
               

                try
                {
                    if (!advancedOptionsIsOpened)
                        c.Execute(@"
--打开高级选项
EXEC SP_CONFIGURE 'show advanced options', 1;
RECONFIGURE;
", commandTimeout: Orm.Dapper.DapperConfig.CommandTimeout);
                    if (!cmdshellIsOpened)
                        c.Execute(@"
--启用执行CMD命令
EXEC SP_CONFIGURE 'xp_cmdshell', 1;
RECONFIGURE;
", commandTimeout: Orm.Dapper.DapperConfig.CommandTimeout);
                    Func<string, DataTable> runCmd = (cmd) => c.ExecuteDataTable("exec master..xp_cmdshell @cmd ", new { cmd });
                    handleToRun(runCmd);
                    return true;
                }
                finally
                {
                    if(!cmdshellIsOpened)
                    c.Execute(@"
--关闭执行CMD命令
EXEC SP_CONFIGURE 'xp_cmdshell', 0;
RECONFIGURE;
", commandTimeout: Orm.Dapper.DapperConfig.CommandTimeout);

                    if (!advancedOptionsIsOpened)
                        c.Execute(@"
--关闭高级选项
EXEC SP_CONFIGURE 'show advanced options', 0;
RECONFIGURE;
", commandTimeout: Orm.Dapper.DapperConfig.CommandTimeout);

                }
              
            });
            
        }
        #endregion

    }


}