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<?php

/*
 * This file is part of Evenement.
 *
 * (c) Igor Wiedler <igor@wiedler.ch>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Evenement;

trait EventEmitterTrait
{
    protected $listeners = [];

public function on($event, callable $listener)
    {
        if (!isset($this->listeners[$event])) {
            $this->listeners[$event] = [];
        }

$this->listeners[$event][] = $listener;

return $this;
    }

public function once($event, callable $listener)
    {
        $onceListener = function () use (&$onceListener, $event, $listener) {
            $this->removeListener($event, $onceListener);

\call_user_func_array($listener, \func_get_args());
        };

$this->on($event, $onceListener);
    }

public function removeListener($event, callable $listener)
    {
        if (isset($this->listeners[$event])) {
            $index = \array_search($listener, $this->listeners[$event], true);
            if (false !== $index) {
                unset($this->listeners[$event][$index]);
                if (\count($this->listeners[$event]) === 0) {
                    unset($this->listeners[$event]);
                }
            }
        }
    }

public function removeAllListeners($event = null)
    {
        if ($event !== null) {
            unset($this->listeners[$event]);
        } else {
            $this->listeners = [];
        }
    }

public function listeners($event)
    {
        return isset($this->listeners[$event]) ? $this->listeners[$event] : [];
    }

public function emit($event, array $arguments = [])
    {
        foreach ($this->listeners($event) as $listener) {
            \call_user_func_array($listener, $arguments);
        }
    }
}