/*
 * 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-function.h"

/**
 * SECTION: sql-function
 * @Short_description: the equivalent of an SQL function.
 * @Title: SqlFunction
 * 
 * The #SqlFunction represents a function and its parameters.
 **/
G_DEFINE_TYPE (SqlFunction, sql_function, SQL_TYPE_EXPR);

SqlFunction * sql_function_new (const gchar * name, const gchar * schema)
{
	return g_object_new (SQL_TYPE_FUNCTION, "name", name, "schema", schema, NULL);
}

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

static void sql_function_render (SqlFunction * obj, SqlRender * render)
{
	if (obj->schema)
	{
		sql_render_add_identifier (render, obj->schema);
		sql_render_append (render, ".");
	}

	sql_render_add_identifier (render, obj->name);
	
	if (obj->name)
	{
		sql_render_append (render, "(");
		sql_render_add_list (render, F, NULL, obj->param, ",");
		sql_render_append (render, ")");
	}
}

//+++++++++++++++++++++++++++++++++++++++++++++++++++ Public

void sql_function_add_param (SqlFunction * obj, SqlExpr * param)
{
	g_return_if_fail (SQL_IS_FUNCTION (obj));
	g_return_if_fail (SQL_IS_EXPR (param));

	obj->param = g_slist_append (obj->param, g_object_ref_sink (param));
}

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

enum
{
	 PROP_NAME = 1
	,PROP_SCHEMA
};

static void sql_function_set_property (SqlFunction * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_NAME:
			g_free (obj->name);
			obj->name = g_value_dup_string (value);
			break;
		case PROP_SCHEMA:
			g_free (obj->schema);
			obj->schema = g_value_dup_string (value);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_function_get_property (SqlFunction * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_NAME:
			g_value_set_string (value, obj->name);
			break;
		case PROP_SCHEMA:
			g_value_set_string (value, obj->schema);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

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

static void sql_function_init (SqlFunction * obj)
{
	obj->name = NULL;
	obj->schema = NULL;
	obj->param = NULL;
}

static void sql_function_finalize (SqlFunction * obj)
{
	g_free (obj->name);
	g_free (obj->schema);
	g_slist_free_full (obj->param, g_object_unref);
	G_OBJECT_CLASS (sql_function_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_function_class_init (SqlFunctionClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_function_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_function_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_function_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_function_render;

	g_object_class_install_property (k, PROP_NAME,
		g_param_spec_string ("name"
			,"Name"
			,"The function name"
			,NULL
			,G_PARAM_READWRITE
	));

	g_object_class_install_property (k, PROP_SCHEMA,
		g_param_spec_string ("schema"
			,"Schema"
			,"The schema to which the function belongs"
			,NULL
			,G_PARAM_READWRITE
	));
}