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<?php

namespace SAREhub\Commons\Misc;

/**
 * Calls callback in specified time interval(default 1 sec)
 */
class PeriodicTimer
{

    /**
     * @var int
     */
    private $interval = 1;

    /**
     * @var callable
     */
    private $callback;

    /**
     * @var int
     */
    private $lastCallTime = 0;

    /**
     * Sets calls time interval
     * @param int $interval New interval in secs
     * @return $this
     */
    public static function every($interval)
    {
        $timer = new PeriodicTimer();
        $timer->interval = $interval;
        return $timer;
    }

    /**
     * @param callable $callback
     * @return $this
     */
    public function call(callable $callback)
    {
        $this->callback = $callback;
        return $this;
    }

    /**
     * Updates that timer if is after next call its calls callback.
     * @param int $now
     */
    public function update($now)
    {
        if ($now >= ($this->lastCallTime + $this->interval)) {
            $this->lastCallTime = $now;
            $this->callNow();
        }
    }

    /**
     * Calls callback of that timer
     */
    public function callNow()
    {
        $c = $this->callback;
        $c();
    }

    /**
     * @return int
     */
    public function getInterval()
    {
        return $this->interval;
    }

    /**
     * @return callable
     */
    public function getCallback()
    {
        return $this->callback;
    }
}