<?php
/**
 * @package     OpenCart
 * @author      Daniel Kerr
 * @copyright   Copyright (c) 2005 - 2017, OpenCart, Ltd. (https://www.opencart.com/)
 * @license     https://opensource.org/licenses/GPL-3.0
 * @link        https://www.opencart.com
*/

/**
* Event class
*
* Event System Userguide
* 
* https://github.com/opencart/opencart/wiki/Events-(script-notifications)-2.2.x.x
*/
class Event {
	protected $registry;
	protected $data = array();

    /**
     * Constructor
     *
     * @param    object $route
    */
	public function __construct($registry) {
		$this->registry = $registry;
	}

    /**
     *
     *
     * @param    string $trigger
     * @param    object $action
     * @param    int $priority
    */
	public function register($trigger, Action $action, $priority = 0) {
		$this->data[] = array(
			'trigger'  => $trigger,
			'action'   => $action,
			'priority' => $priority
		);

		$sort_order = array();

		foreach ($this->data as $key => $value) {
			$sort_order[$key] = $value['priority'];
		}

		array_multisort($sort_order, SORT_ASC, $this->data);
	}

    /**
     *
     *
     * @param    string $event
     * @param    array $args
    */
	public function trigger($event, array $args = array()) {
		foreach ($this->data as $value) {
			if (preg_match('/^' . str_replace(array('\*', '\?'), array('.*', '.'), preg_quote($value['trigger'], '/')) . '/', $event)) {
				$result = $value['action']->execute($this->registry, $args);

				if (!is_null($result) && !($result instanceof Exception)) {
					return $result;
				}
			}
		}
	}

    /**
     *
     *
     * @param    string $trigger
     * @param    string $route
    */
	public function unregister($trigger, $route) {
		foreach ($this->data as $key => $value) {
			if ($trigger == $value['trigger'] && $value['action']->getId() == $route) {
				unset($this->data[$key]);
			}
		}
	}

    /**
     *
     *
     * @param    string $trigger
    */
	public function clear($trigger) {
		foreach ($this->data as $key => $value) {
			if ($trigger == $value['trigger']) {
				unset($this->data[$key]);
			}
		}
	}
}
