/*
 * 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/>.
 */

#include "sql-select-field.h"

/**
 * SECTION: sql-select_field
 * @Short_description:
 * @Title: SqlSelectField
 **/
G_DEFINE_TYPE (SqlSelectField, sql_select_field, SQL_TYPE_OBJECT);

SqlObject * sql_select_field_new ()
{
	return g_object_new (SQL_TYPE_SELECT_FIELD, NULL);
}

/**
 * sql_select_field_get_alias:
 * @self: an #SqlSelectField
 * 
 * Gets the alias of @self.
 * 
 * Return value: (transfer none): the field alias.
 **/
const gchar * sql_select_field_get_alias (SqlSelectField * self)
{
	g_return_val_if_fail (SQL_IS_SELECT_FIELD (self), NULL);

	return self->alias;
}

/**
 * sql_select_field_set_alias:
 * @self: an #SqlSelectField
 * @alias: (transfer none): new alias
 * 
 * Sets the alias of @self to @alias.
 **/
void sql_select_field_set_alias (SqlSelectField * self, const gchar * alias)
{
	g_return_if_fail (SQL_IS_SELECT_FIELD (self));

	g_free (self->alias);
	self->alias = g_strdup (alias);
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Private

static void sql_select_field_render (SqlSelectField * self, SqlRender * render)
{
	sql_render_add_object (render, self->expr);
	
	if (self->alias)
	{
		sql_render_add_token (render, "AS");
		sql_render_add_identifier (render, self->alias);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Properties

enum
{
	 PROP_EXPR = 1
	,PROP_ALIAS
};

static void sql_select_field_set_property (SqlSelectField * self, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_EXPR:
			sql_object_remove (self, self->expr);
			self->expr = sql_object_add (self, g_value_get_object (value));
			break;
		case PROP_ALIAS:
			g_free (self->alias);
			self->alias = g_value_dup_string (value);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (self, id, pspec);
	}
}

static void sql_select_field_get_property (SqlSelectField * self, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_EXPR:
			g_value_set_object (value, self->expr);
			break;
		case PROP_ALIAS:
			 g_value_set_string (value, self->alias);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (self, id, pspec);
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Class

static void sql_select_field_init (SqlSelectField * self)
{
	self->expr = NULL;
	self->alias = NULL;
}

static void sql_select_field_finalize (SqlSelectField * self)
{
	g_free (self->alias);
	sql_object_remove (self, self->expr);
	G_OBJECT_CLASS (sql_select_field_parent_class)->finalize (G_OBJECT (self));
}

static void sql_select_field_class_init (SqlSelectFieldClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_select_field_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_select_field_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_select_field_get_property;
	SQL_OBJECT_CLASS (k)->render = (SqlRenderFunc) sql_select_field_render;

	g_object_class_install_property (k, PROP_EXPR,
		sql_param_object ("expr"
			,("Expression")
			,("The expression")
			,SQL_TYPE_EXPR
			,G_PARAM_READWRITE
	));
	g_object_class_install_property (k, PROP_ALIAS,
		g_param_spec_string ("alias"
			,("Alias")
			,("The alias for the expression")
			,NULL
			,G_PARAM_READWRITE
	));
}