// Copyright © 2008, 2010, Oracle and/or its affiliates. All rights reserved.
//
// MySQL for Visual Studio is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA using System;

using System;
using Microsoft.VisualStudio.Data;
using System.Data.Common;
using Microsoft.VisualStudio.Data.AdoDotNet;
using System.Data;

namespace MySql.Data.VisualStudio
{
  class StoredProcedureColumnEnumerator : DataObjectEnumerator
  {
    public override DataReader EnumerateObjects(string typeName, object[] items,
        object[] restrictions, string sort, object[] parameters)
    {
      DbConnection conn = (DbConnection)Connection.GetLockedProviderObject();
      try
      {
        string spName = String.Format("{0}.{1}", restrictions[1], restrictions[2]);

        if (conn.State != ConnectionState.Open)
          conn.Open();

        string[] parmRest = new string[5];
        parmRest[1] = (string)restrictions[1];
        parmRest[2] = (string)restrictions[2];
        parmRest[3] = (string)restrictions[3];
        DataTable parmTable = conn.GetSchema("Procedure Parameters", parmRest);

        DbCommand cmd = conn.CreateCommand();
        cmd.CommandText = spName;
        cmd.CommandType = CommandType.StoredProcedure;

        foreach (DataRow row in parmTable.Rows)
        {
          if (row["ORDINAL_POSITION"].Equals(0)) continue;

          DbParameter p = cmd.CreateParameter();
          p.ParameterName = row["PARAMETER_NAME"].ToString();
          p.Value = GetDefaultValue(row["DATA_TYPE"].ToString());
          switch (row["PARAMETER_MODE"].ToString())
          {
            case "IN":
              p.Direction = ParameterDirection.Input;
              break;
            case "OUT":
              p.Direction = ParameterDirection.Output;
              break;
            case "INOUT":
              p.Direction = ParameterDirection.InputOutput;
              break;
          }
          cmd.Parameters.Add(p);
        }

        using (IDataReader reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly))
        {
          DataTable dt = reader.GetSchemaTable();
          if (dt == null)
            dt = new DataTable();
          else
          {
            dt.Columns.Add(new DataColumn("RoutineName", typeof(string)));
            foreach (DataRow row in dt.Rows)
            {
              row["RoutineName"] = restrictions[2];
              string basedb = row["BaseSchemaName"] as string;
              if (String.IsNullOrEmpty(basedb) || row["BaseSchemaName"] == DBNull.Value)
                row["BaseSchemaName"] = cmd.Connection.Database;
            }
          }
          return new AdoDotNetDataTableReader(dt);
        }
      }
      finally
      {
        Connection.UnlockProviderObject();
      }
    }

    private object GetDefaultValue(string dataType)
    {
      if (dataType == "VARCHAR" || dataType == "VARBINARY" ||
          dataType == "ENUM" || dataType == "SET" || dataType == "CHAR")
        return "";
      return 0;
    }
  }
}
