/*
 * Copyright (C) 2012 - Juan Ferrer Toribio
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#ifndef SQL_SELECT_H
#define SQL_SELECT_H

#include "sql-dml.h"

#define SQL_TYPE_SELECT		(sql_select_get_type ())
#define SQL_SELECT(obj)		(G_TYPE_CHECK_INSTANCE_CAST (obj, SQL_TYPE_SELECT, SqlSelect))
#define SQL_IS_SELECT(obj)	(G_TYPE_CHECK_INSTANCE_TYPE (obj, SQL_TYPE_SELECT))

typedef struct _SqlSelect SqlSelect;
typedef struct _SqlSelectClass SqlSelectClass;

typedef enum
{
	 SQL_SELECT_NONE
	,SQL_SELECT_UNION_ALL
	,SQL_SELECT_UNION_ANY
	,SQL_SELECT_INTERSECT
	,SQL_SELECT_EXCEPT
	,SQL_SELECT_COUNT
}
SqlSelectType;

/**
 * SqlOrderWay:
 * @SQL_ORDER_ASC: ascendent order
 * @SQL_ORDER_DESC: descendent order
 **/
typedef enum
{
	 SQL_ORDER_ASC
	,SQL_ORDER_DESC
}
SqlOrderWay;

/**
 * SqlSelect:
 * @expr: (element-type Sql.Expr):
 * @group: (element-type Sql.Expr):
 * @order: (element-type Sql.Expr):
 **/
struct _SqlSelect
{
	SqlDml parent;
	gboolean distinct;
	GSList * expr;
	GSList * alias; // List of Sql.SelectAlias
	GSList * group;
	SqlExpr * having;
	GSList * order;
	guint limit_offset;
	guint limit_count;
	
	SqlSelectType type;
	SqlSelect * next;	
};

struct _SqlSelectClass
{
	/* <private> */
	SqlDmlClass parent;
};

GType		sql_select_get_type		();
SqlSelect *	sql_select_new			();
void		sql_select_set_distinct	(SqlSelect * obj, gboolean distinct);
void		sql_select_add_expr		(SqlSelect * obj, SqlExpr * expr);
void		sql_select_set_alias	(SqlSelect * obj, SqlExpr * expr, const gchar * alias);
void		sql_select_add_group	(SqlSelect * obj, SqlExpr * expr);
void		sql_select_set_having	(SqlSelect * obj, SqlExpr * expr);
void		sql_select_add_order	(SqlSelect * obj, SqlExpr * expr, SqlOrderWay way);
void		sql_select_set_limit	(SqlSelect * obj, guint count, guint offset);
void		sql_select_set_next		(SqlSelect * obj, SqlSelect * next, SqlSelectType type);

#endif