/*
 * Copyright (C) 2008-2010 Trinity <http://www.trinitycore.org/>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _SQLOPERATION_H
#define _SQLOPERATION_H

#include <ace/Method_Request.h>
#include <ace/Activation_Queue.h>

#include "Common.h"
#include "Callback.h"

//- Forward declare (don't include header to prevent circular includes)
class PreparedStatement;

//- Union that holds element data
union SQLElementUnion
{
    PreparedStatement* stmt;
    const char* query;
};

//- Type specifier of our element data
enum SQLElementDataType
{
    SQL_ELEMENT_RAW,
    SQL_ELEMENT_PREPARED,
};

//- The element
struct SQLElementData
{
    SQLElementUnion element;
    SQLElementDataType type;
};

//- For ambigious resultsets
union SQLResultSetUnion
{
    PreparedResultSet* presult;
    ResultSet* qresult;
};

class MySQLConnection;

class SQLOperation : public ACE_Method_Request
{
    public:
        SQLOperation(){};
        virtual int call()
        {
            Execute();
            return 0;
        }
        virtual bool Execute() = 0;
        virtual void SetConnection(MySQLConnection* con) { m_conn = con; }

        MySQLConnection* m_conn;
};

typedef ACE_Future<QueryResult> QueryResultFuture;
/*! Raw, ad-hoc query. */
class BasicStatementTask :  public SQLOperation
{
    public:
        BasicStatementTask(const char* sql);
        BasicStatementTask(const char* sql, QueryResultFuture result);
        ~BasicStatementTask();

        bool Execute();

    private:
        const char* m_sql;      //- Raw query to be executed
        bool m_has_result;
        QueryResultFuture m_result;
};



class SQLQueryHolder
{
    friend class SQLQueryHolderTask;
    private:
        typedef std::pair<SQLElementData, SQLResultSetUnion> SQLResultPair;
        std::vector<SQLResultPair> m_queries;
    public:
        SQLQueryHolder() {}
        ~SQLQueryHolder();
        bool SetQuery(size_t index, const char *sql);
        bool SetPQuery(size_t index, const char *format, ...) ATTR_PRINTF(3,4);
        bool SetPreparedQuery(size_t index, PreparedStatement* stmt);
        void SetSize(size_t size);
        QueryResult GetResult(size_t index);
        PreparedQueryResult GetPreparedResult(size_t index);
        void SetResult(size_t index, ResultSet* result);
        void SetPreparedResult(size_t index, PreparedResultSet* result);
};

typedef ACE_Future<SQLQueryHolder*> QueryResultHolderFuture;

class SQLQueryHolderTask : public SQLOperation
{
    private:
        SQLQueryHolder * m_holder;
        QueryResultHolderFuture m_result;

    public:
        SQLQueryHolderTask(SQLQueryHolder *holder, QueryResultHolderFuture res)
            : m_holder(holder), m_result(res){};
        bool Execute();

};


#endif