/*
 * $Id: rb_idler.c 351 2006-02-10 15:25:40Z tilman $
 *
 * Copyright (C) 2004 ruby-ecore team (see AUTHORS)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <ruby.h>
#include <stdbool.h>

#include <Ecore.h>

#include "rb_ecore.h"

typedef struct {
	Ecore_Idler *real;
	VALUE callback;
	bool deleted;
} RbIdler;

static int on_idler (void *data)
{
	VALUE r;
	RbIdler *idler = data;

	r = rb_funcall (idler->callback, rb_intern ("call"), 0);

	/* if the callback returns false, we return 0 and Ecore
	 * will remove the idler
	 */
	if (r == Qfalse)
		idler->deleted = true;

	return (r != Qfalse);
}

static void c_mark (RbIdler *idler)
{
	rb_gc_mark (idler->callback);
}

static void c_free (RbIdler *idler)
{
	if (idler->real && !idler->deleted)
		ecore_idler_del (idler->real);

	ecore_shutdown ();

	free (idler);
}

static VALUE c_alloc (VALUE klass)
{
	RbIdler *idler;

	ecore_init ();

	return Data_Make_Struct (klass, RbIdler, c_mark, c_free, idler);
}

/*
 * call-seq:
 *  Ecore::Idler.new { block } => idler
 *
 * Creates an Ecore::Idler object.
 * When Ecore is idle, the specified block will be called.
 * If the block returns false, the idler is deleted.
 */
static VALUE c_init (VALUE self)
{
	GET_OBJ (self, RbIdler, idler);

	if (!rb_block_given_p ())
		rb_raise (rb_eStandardError, "block missing");

	idler->callback = rb_block_proc ();
	idler->deleted = false;
	idler->real = ecore_idler_add (on_idler, idler);

	return self;
}

/*
 * call-seq:
 *  idler.delete => nil
 *
 * Deletes <i>idler</i>.
 */
static VALUE c_delete (VALUE self)
{
	GET_OBJ (self, RbIdler, idler);

	if (idler->real && !idler->deleted) {
		ecore_idler_del (idler->real);
		idler->real = NULL;
		idler->deleted = true;
	} else
		rb_raise (rb_eException, "Idler already deleted!");

	return Qnil;
}

void Init_Idler (void)
{
	VALUE c = rb_define_class_under (mEcore, "Idler", rb_cObject);

	rb_define_alloc_func (c, c_alloc);
	rb_define_method (c, "initialize", c_init, 0);
	rb_define_method (c, "delete", c_delete, 0);
}