<?php
require_once 'AlarmManagement/DataTypes/AlarmStatus.php';

class AlarmBalance {
	
	private $value;
	
	public function AlarmBalance($val = 0) {
		$this->value = $val;
	}
	
	public function getValue() {
		return $this->value;
	}
	
	public function max() {
		for ($i = AlarmStatus::AS_CRIT; $i >= AlarmStatus::AS_WARN; $i--) {
			if (($this->value & pow(2,$i)) != 0) {
				return new AlarmStatus($i);
			}
		}
		return new AlarmStatus(AlarmStatus::AS_CLEAR);
	}
	
	public function accu(AlarmStatus $alm_stat) {
		$this->value = $this->value | pow(2,$alm_stat->getValue());
		return $this;
	}
	
	public function join(AlarmBalance $alm_bal) {
		$this->value = $this->value | $alm_bal->getValue();
		return $this;
	}
	
	public function cut(AlarmBalance $alm_bal) {
		$this->value = $this->value & $alm_bal->getValue();
		return $this;
	}
	
	public function substract(AlarmBalance $alm_bal) {
		$this->value = $this->value & ~($alm_bal->getValue());
		return $this;
	}
	
	public function __toString() {
		$out = "{";
		$trenner = "";
		for ($i = AlarmStatus::AS_WARN; $i <= AlarmStatus::AS_CRIT; $i++) {
			if (($this->value & pow(2,$i)) != 0) {
				$as = new AlarmStatus($i);
				$out = $out . $trenner . $as;
				$trenner = ",";
			}
		}
		$out = $out . "}";
		return $out;
	}
}