/*
 * 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-list.h"

/**
 * SECTION: sql-list
 * @Short_description: Container for a list of #SqlObject of a certain type
 * @Title: SqlList
 **/
G_DEFINE_TYPE (SqlList, sql_list, SQL_TYPE_OBJECT);

SqlList * sql_list_new (GType gtype)
{
	return g_object_new (SQL_TYPE_LIST, "gtype", gtype, NULL);
}

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

static void sql_list_render (SqlList * obj, SqlRender * render)
{
	GList * i;
	
	for (i = obj->items.tail; i; i = i->next)
	{
		sql_render_add_object (render, i->data);

		if (i->next)
			sql_render_append (render, ", ");
	}
}

static gboolean sql_list_is_ready (SqlList * obj)
{
	GList * i;
	
	for (i = obj->items.tail; i; i = i->next)
		if (!sql_object_is_ready (i->data))
			return FALSE;
			
	return TRUE;
}

static void sql_list_item_changed (SqlObject * item, SqlObject * obj)
{
	sql_object_changed (obj);
}

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

/**
 * sql_list_add:
 * @obj: the #SqlList
 * @item: (allow-none): the #SqlObject
 *
 * Adds an item to the end of the list.
 **/
void sql_list_add (SqlList * obj, gpointer item)
{
	g_return_if_fail (SQL_IS_LIST (obj));
	
	sql_list_insert (obj, item, -1);
}

/**
 * sql_list_insert:
 * @obj: the #SqlList
 * @item: (allow-none): the #SqlObject
 * @n: the position in which to place the item
 *
 * Adds an item to the list. If position is a negative number the element will
 * be added to the end of the list.
 **/
void sql_list_insert (SqlList * obj, gpointer item, guint n)
{
	g_return_if_fail (SQL_IS_LIST (obj));
	g_return_if_fail (G_TYPE_CHECK_INSTANCE_TYPE (item, obj->gtype) || SQL_IS_HOLDER (item) || !item);
	
	if (n > 0)
		g_queue_push_nth (&obj->items, g_object_ref_sink (item), n);
	else
		g_queue_push_head (&obj->items, g_object_ref_sink (item));

	g_signal_connect (item, "changed",
		G_CALLBACK (sql_list_item_changed), obj
	);
}

/**
 * sql_list_get:
 * @obj: the #SqlList
 *
 * Gets an item from the list.
 *
 * Return value: (transfer none) (allow-none): the selected #SqlObject
 **/
gpointer sql_list_get (SqlList * obj, guint n)
{
	g_return_val_if_fail (SQL_IS_LIST (obj), NULL);
	
	return g_queue_peek_nth (&obj->items, n);
}

/**
 * sql_list_remove:
 * @obj: the #SqlList
 *
 * Removes an item from the list.
 *
 * Return value: (transfer none) (allow-none): the removed #SqlObject
 **/
gpointer sql_list_remove (SqlList * obj, guint n)
{
	SqlObject * item;

	g_return_val_if_fail (SQL_IS_LIST (obj), NULL);
	
	item = g_queue_pop_nth (&obj->items, n);
	g_signal_handlers_disconnect_by_func (item,
		sql_list_item_changed, obj);
		
	return item;
}

/**
 * sql_list_get_items:
 * @obj: the #SqlList
 *
 * Gets all list elements.
 *
 * Return value: (transfer none) (allow-none): the list items
 **/
GList * sql_list_get_items (SqlList * obj)
{
	g_return_val_if_fail (SQL_IS_LIST (obj), NULL);
	
	return obj->items.tail;
}

/**
 * sql_list_get_items_type:
 * @obj: the #SqlList
 *
 * Gets the allowed type for the list elements.
 *
 * Return value: the #GType
 **/
GType sql_list_get_items_type (SqlList * obj)
{
	g_return_val_if_fail (SQL_IS_LIST (obj), 0);
	
	return obj->gtype;
}

/**
 * sql_list_lenght:
 * @obj: the #SqlList
 *
 * Gets the number of items in the list.
 *
 * Return value: the number of items
 **/
guint sql_list_length (SqlList * obj)
{
	g_return_val_if_fail (SQL_IS_LIST (obj), 0);

	return obj->items.length;
}

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

enum
{
	 PROP_GTYPE = 1
	,PROP_LENGTH
};

static void sql_list_set_property (SqlList * obj, guint id,
	const GValue * value, GParamSpec * pspec)
{
	switch (id)
	{
		case PROP_GTYPE:
			obj->gtype = g_value_get_gtype (value);
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

static void sql_list_get_property (SqlList * obj, guint id,
	GValue * value, GParamSpec * pspec)
{	
	switch (id)
	{
		case PROP_GTYPE:
			g_value_set_gtype (value, obj->gtype);
			break;
		case PROP_LENGTH:
			g_value_set_uint (value, sql_list_length (obj));
			break;
		default:		
			G_OBJECT_WARN_INVALID_PROPERTY_ID (obj, id, pspec);
	}
}

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

static void sql_list_init (SqlList * obj)
{
	g_queue_init (&obj->items);
}

static void sql_list_finalize (SqlList * obj)
{
	GList * i;
	
	for (i = obj->items.tail; i; i = i->next)
	{
		g_signal_handlers_disconnect_by_func (i->data,
			sql_list_item_changed, obj);
		g_object_unref (i->data);
	}

	g_queue_clear (&obj->items);
	G_OBJECT_CLASS (sql_list_finalize)->finalize (G_OBJECT (obj));
}

static void sql_list_class_init (SqlListClass * k)
{
	GObjectClass * klass = G_OBJECT_CLASS (k);
	klass->finalize = (GObjectFinalizeFunc) sql_list_finalize;
	klass->set_property = (GObjectSetPropertyFunc) sql_list_set_property;
	klass->get_property = (GObjectGetPropertyFunc) sql_list_get_property;
	SQL_OBJECT_CLASS (klass)->render = (SqlRenderFunc) sql_list_render;
	SQL_OBJECT_CLASS (klass)->is_ready = (SqlObjectIsReadyFunc) sql_list_is_ready;

	g_object_class_install_property (klass, PROP_LENGTH,
		g_param_spec_uint ("length"
			,_("Length")
			,_("The length of the list")
			,0, G_MAXUINT, 0
			,G_PARAM_READABLE
	));
	g_object_class_install_property (klass, PROP_GTYPE,
		g_param_spec_gtype ("gtype"
			,_("GType")
			,_("The allowed type for the items")
			,SQL_TYPE_OBJECT
			,G_PARAM_READABLE | G_PARAM_CONSTRUCT_ONLY
	));
}