<?php

class ArrayTimer extends ArrayObject {
	
	public static function get ( $period ) {
		
		$a = new static();
		
		return $a->setPeriod($period);
		
	}
	
	private $period = 60, $min = 0;
	
	public function setPeriod ( $period, $min = 0 ) {
		
		$this->period = $period;
		$this->min = $min;
		
		return $this;
		
	}
	
	public function update ( $id, $delta = 0 ) {
		
		$this[$id] = time() + $delta;
		
		return $this;
		
	}
	
	public function offsetGet ( $id ) {
		
		if ( !$this->offsetExists($id) )
			$this[$id] = time() - $this->period;
		
		return parent::offsetGet($id);
		
	}
	
	public function sleepTime ( $id ) {
		
		return max(0, $this->period + $this[$id] - time());
		
	}
	
	public function sleepSkip ( $id ) {
		
		$skip = !$this->sleepTime($id);
		
		if ( $skip )
			$this->update($id);
		
		return $skip;
		
	}
	
	public function sleep ( $id ) {
		
		$sleep = $this->sleepTime($id);
		
		if ( $sleep || $this->min )
			sleep(max($sleep, $this->min));
		
		return $this->update($id);
		
	}
	
	public function select () {
		
		$timer = $this;
		return new CallbackFilterIterator($this, function ( $value, $key, $it ) use ( $timer ) {
			
			return !$timer->sleepTime($key);
			
		});
		
	}
	
}

?>