/*
 * 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-insert.h"

/**
 * SECTION: sql-insert
 * @Short_description: the equivalent of the INSERT statement in SQL.
 * @Title: SqlInsert
 * 
 * The #SqlInsert represents a insertion statement.
 **/
G_DEFINE_TYPE (SqlInsert, sql_insert, SQL_TYPE_STMT);

SqlInsert * sql_insert_new ()
{
	return g_object_new (SQL_TYPE_INSERT, NULL);
}

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

static void sql_insert_expr_free (SqlExpr * expr)
{
	if (expr)
		g_object_unref (expr);
}

static void sql_insert_render_expr (SqlExpr * obj, SqlRender * render)
{
	if (obj)
		sql_render_add_object (render, obj);
	else
		sql_render_add_token (render, "DEFAULT");
}

static void sql_insert_render_row (GSList * obj, SqlRender * render)
{
	sql_render_add_espace (render);
	sql_render_append (render, "(");
	sql_render_add_list_with_func (render, T, NULL, obj, ",",
		(SqlRenderFunc) sql_insert_render_expr);
	sql_render_append (render, ")");
}

static void sql_insert_render (SqlInsert * obj, SqlRender * render)
{
	sql_render_add_item (render, T, "INSERT INTO", obj->table);

	if (obj->table)
	{
		if (obj->expr)
		{
			sql_render_add_espace (render);
			sql_render_append (render, "(");
			sql_render_add_list (render, F, NULL, obj->field, ",");
			sql_render_append (render, ")");
			sql_render_add_token (render, "VALUES");
			sql_render_add_list_with_func (render, F, NULL, obj->expr, ",",
				(SqlRenderFunc) sql_insert_render_row);
		}
		else
			sql_render_add_token (render, "DEFAULT VALUES");
	}
}

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

void sql_insert_set_table (SqlInsert * obj, SqlTable * table)
{
	g_return_if_fail (SQL_IS_INSERT (obj));
	g_return_if_fail (SQL_IS_TABLE (table));

	g_clear_object (&obj->table);
	obj->table = g_object_ref_sink (table);
}

void sql_insert_add_row (SqlInsert * obj)
{
	g_return_if_fail (SQL_IS_INSERT (obj));
	
	obj->iter = g_slist_alloc ();
	obj->expr = g_slist_concat (obj->expr, obj->iter);
}

void sql_insert_add_field (SqlInsert * obj, SqlField * field)
{
	g_return_if_fail (SQL_IS_INSERT (obj));
	g_return_if_fail (SQL_IS_FIELD (field));

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

void sql_insert_add_expr (SqlInsert * obj, SqlExpr * expr)
{
	g_return_if_fail (SQL_IS_INSERT (obj));
	g_return_if_fail (SQL_IS_EXPR (expr) || !expr);
	
	if (!obj->iter)
		sql_insert_add_row (obj);
	if (expr)
		g_object_ref_sink (expr);
	
	obj->iter->data = g_slist_append (obj->iter->data, expr);
}

void sql_insert_clean (SqlInsert * obj)
{
	GSList * n;
	
	g_return_if_fail (SQL_IS_INSERT (obj));

	g_slist_free_full (obj->field, g_object_unref);
	
	for (n = obj->expr; n; n = n->next)
		g_slist_free_full (n->data, (GDestroyNotify) sql_insert_expr_free);
	
	g_slist_free (obj->expr);
}

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

enum
{
	 PROP_TABLE = 1
};

static void sql_insert_set_property (SqlInsert * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_TABLE:
			sql_insert_set_table (obj, g_value_get_object (value));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_insert_get_property (SqlInsert * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_TABLE:
			g_value_set_object (value, obj->table);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

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

static void sql_insert_init (SqlInsert * obj)
{
	obj->table = NULL;
	obj->field = NULL;
	obj->expr = NULL;
	obj->iter = NULL;
}

static void sql_insert_finalize (SqlInsert * obj)
{
	sql_insert_clean (obj);
	g_clear_object (&obj->table);
	G_OBJECT_CLASS (sql_insert_parent_class)->finalize (G_OBJECT (obj));
}

static void sql_insert_class_init (SqlInsertClass * klass)
{
	GObjectClass * k = G_OBJECT_CLASS (klass);
	k->finalize = (GObjectFinalizeFunc) sql_insert_finalize;
	k->set_property = (GObjectSetPropertyFunc) sql_insert_set_property;
	k->get_property = (GObjectGetPropertyFunc) sql_insert_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_insert_render;

	g_object_class_install_property (k, PROP_TABLE,
		g_param_spec_object ("table"
			,"Table"
			,"The table where the row is inserted"
			,SQL_TYPE_TABLE
			,G_PARAM_READWRITE
	));
}