<?php

namespace Laminas\EventManager;

use Psr\Container\ContainerInterface;

use function is_string;

/**
 * Lazy listener instance for use with LazyListenerAggregate.
 *
 * Used as an internal class for the LazyAggregate to allow lazy creation of
 * listeners via a dependency injection container.
 *
 * Lazy event listener definitions add the following members to what the
 * LazyListener accepts:
 *
 * - event: the event name to attach to.
 * - priority: the priority at which to attach the listener, if not the default.
 */
class LazyEventListener extends LazyListener
{
    /** @var string Event name to which to attach. */
    private $event;

    /** @var null|int Priority at which to attach. */
    private $priority;

    /**
     * @param array $definition
     * @param array $env
     */
    public function __construct(array $definition, ContainerInterface $container, array $env = [])
    {
        parent::__construct($definition, $container, $env);

        if (
            ! isset($definition['event'])
            || ! is_string($definition['event'])
            || empty($definition['event'])
        ) {
            throw new Exception\InvalidArgumentException(
                'Lazy listener definition is missing a valid "event" member; cannot create LazyListener'
            );
        }

        $this->event    = $definition['event'];
        $this->priority = isset($definition['priority']) ? (int) $definition['priority'] : null;
    }

    /**
     * @return string
     */
    public function getEvent()
    {
        return $this->event;
    }

    /**
     * @param int $default
     * @return int
     */
    public function getPriority($default = 1)
    {
        return null !== $this->priority ? $this->priority : $default;
    }
}