/*
 * 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 "vn-builder.h"
#include "vn-field.h"
#include <vn/field/field.h>
#include <vn/column/column.h>

/**
 * SECTION: vn-builder
 * @Short_description: functions to use with the GtkBuilder
 * @Title: VnBuilder
 * 
 * These are a set of functions that make it easy to create and bind interfaces
 * to data using the #GtkBuilder and the #DbLib, part of the Hedera library.
 **/
G_DEFINE_TYPE (VnBuilder, vn_builder, GTK_TYPE_BUILDER);

VnBuilder * vn_builder_new ()
{
	return g_object_new (VN_TYPE_BUILDER, NULL);
}

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

/**
 * vn_builder_load_file:
 * @obj: a #VnBuilder
 * @conn: a #DbConn
 * @filename: the name of the file to parse
 * @err: (out) (allow-none): return location for an error, or %NULL
 *
 * Parses a file containing a GtkBuilder UI definition and merges it with the
 * current contents of builder. Also sets de conn property of objects that use
 * the #DbConn
 *
 * Return value: A positive value on success, 0 if an error occurred
 **/
guint vn_builder_load_file (VnBuilder * obj, DbConn * conn, const gchar * filename, GError ** err)
{
	guint success;
	GtkBuilder * builder;

	g_return_val_if_fail (VN_IS_BUILDER (obj), 0);
	g_return_val_if_fail (DB_IS_CONN (conn), 0);
	
	builder = GTK_BUILDER (obj);
	success = gtk_builder_add_from_file (builder, filename, err);

	if (success)
	{
		GSList * n;
		GSList * objects = gtk_builder_get_objects (builder);
		
		for (n = objects; n; n = n->next)
		if (VN_IS_COMBO (n->data)
		|| VN_IS_COMPLETION (n->data)
		|| VN_IS_COLUMN_COMBO (n->data)
		|| DB_IS_MODEL (n->data)
		|| DB_IS_ITERATOR (n->data))
			g_object_set (n->data, "conn", conn, NULL);
			
		g_slist_free (objects);
	}

	return success;
}

/**
 * vn_builder_bind_fields:
 * @obj: a #VnBuilder 
 * @iterator: where params are obtained.
 * @...: pairs of column name and field id, terminated with -1
 *
 * Binds several iterator parameters to #VnEntry entries.
 * The variable list argument should contain a string with the column name and
 * a string the #VnField id.
 **/
void vn_builder_bind_fields (VnBuilder * obj, DbIterator * iterator, ...)
{
	va_list vl;
	gchar * column;
	const gchar * id;
	VnField * field;

	g_return_if_fail (VN_IS_BUILDER (obj));
	g_return_if_fail (DB_IS_ITERATOR (iterator));

	va_start (vl, iterator);

	while ((column = va_arg (vl, gchar *)) != NULL)
	{
		id = va_arg (vl, gchar *);
		field = vn_builder_get (obj, id);

		if (VN_IS_FIELD (field))
			vn_field_set_param (field, db_iterator_get_param (iterator, column));
		else
			g_warning ("VnBuilder: Object '%s' isn't a VnField!", id);
	}

	va_end (vl);
}

/**
 * vn_builder_bind_columns:
 * @obj: a #VnBuilder
 * @...: pairs of column name and column id, terminated with -1
 *
 * Binds several model columns to #VnColumn columns.
 * The variable list argument should contain a string  with the column name and
 * a string the #VnColumn id.
 **/
void vn_builder_bind_columns (VnBuilder * obj, ...)
{
	va_list vl;
	gchar * column_name;
	const gchar * id;
	VnColumn * column;

	g_return_if_fail (VN_IS_BUILDER (obj));

	va_start (vl, obj);

	while ((column_name = va_arg (vl, gchar *)) != NULL)
	{
		id = va_arg (vl, gchar *);
		column = vn_builder_get (obj, id);

		if (VN_IS_COLUMN (column))
			vn_column_set_column_name (column, column_name);
		else
			g_warning ("VnBuilder: Object '%s' isn't a VnColumn!", id);
	}

	va_end (vl);
}

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

static void vn_builder_init (VnBuilder * obj) {}

static void vn_builder_class_init (VnBuilderClass * k) {}