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<?php

namespace React\EventLoop\Timer;

use SplObjectStorage;
use SplPriorityQueue;

class Timers
{
    private $time;
    private $timers;
    private $scheduler;

public function __construct()
    {
        $this->timers = new SplObjectStorage();
        $this->scheduler = new SplPriorityQueue();
    }

public function updateTime()
    {
        return $this->time = microtime(true);
    }

public function getTime()
    {
        return $this->time ?: $this->updateTime();
    }

public function add(TimerInterface $timer)
    {
        $interval = $timer->getInterval();
        $scheduledAt = $interval + microtime(true);

$this->timers->attach($timer, $scheduledAt);
        $this->scheduler->insert($timer, -$scheduledAt);
    }

public function contains(TimerInterface $timer)
    {
        return $this->timers->contains($timer);
    }

public function cancel(TimerInterface $timer)
    {
        $this->timers->detach($timer);
    }

public function getFirst()
    {
        while ($this->scheduler->count()) {
            $timer = $this->scheduler->top();

if ($this->timers->contains($timer)) {
                return $this->timers[$timer];
            }

$this->scheduler->extract();
        }

return null;
    }

public function isEmpty()
    {
        return count($this->timers) === 0;
    }

public function tick()
    {
        $time = $this->updateTime();
        $timers = $this->timers;
        $scheduler = $this->scheduler;

while (!$scheduler->isEmpty()) {
            $timer = $scheduler->top();

if (!isset($timers[$timer])) {
                $scheduler->extract();
                $timers->detach($timer);

continue;
            }

if ($timers[$timer] >= $time) {
                break;
            }

$scheduler->extract();
            call_user_func($timer->getCallback(), $timer);

if ($timer->isPeriodic() && isset($timers[$timer])) {
                $timers[$timer] = $scheduledAt = $timer->getInterval() + $time;
                $scheduler->insert($timer, -$scheduledAt);
            } else {
                $timers->detach($timer);
            }
        }
    }
}