Delay.php

<?php

/**
 * @license GNU Lesser General Public License v2.1
 * @author FlowyProject(https://github.com/FlowyProject/)
 */

declare(strict_types=1);

namespace PJZ9n\Example;

use pocketmine\event\Event;
use pocketmine\scheduler\Task;
use pocketmine\scheduler\TaskScheduler;
use function flowy\listen;

final class Delay
{
    public static function load(): void
    {
        //NOOP
    }
}

class DelayCallbackEvent extends Event
{
    /** @var int */
    protected $id;
    
    public function __construct(int $id)
    {
        $this->id = $id;
    }
    
    public function getDelayId(): int
    {
        return $this->id;
    }
}

class DelayTask extends Task
{
    protected static $currentId = 0;
    
    /** @var int */
    protected $id;
    
    protected function __construct(int $id)
    {
        $this->id = $id;
    }
    
    public function getDelayId(): int
    {
        return $this->id;
    }
    
    public function onRun(int $currentTick)
    {
        (new DelayCallbackEvent($this->id))->call();
    }
    
    public static function create(): DelayTask
    {
        return new DelayTask(self::$currentId++);
    }
}

function delay(TaskScheduler $scheduler, int $tick)
{
    $task = DelayTask::create();
    $scheduler->scheduleDelayedTask($task, $tick);
    yield listen(DelayCallbackEvent::class)->filter(function ($ev) use ($task) {
        /** @var DelayCallbackEvent $ev */
        return $ev->getDelayId() === $task->getDelayId();
    });
}