<?php defined('SYSPATH') or die('No direct access allowed.');

/**
 * This class is handling Ademco Contact ID Events
 *
 * @package    HAM
 * @category   Helpers
 * @author     Deon George
 * @copyright  (c) 2010 Deon George
 * @license    http://dev.leenooks.net/license.html
 */
class ContactID {
	// Raw event ID
	private $id = '';
	private $acct;
	private $sub;
	private $qualifier;
	private $type;
	private $area;
	private $alarm;
	private $checksum;
	private $datetime;

	public function event($id,$dt,$cf='',$cn='') {
		// @todo This shouldnt stop program execution, rather it should generate an email to an admin
		if (! $this->check($id))
			throw new Kohana_Exception('ContactID event :event is not valid',array(':event'=>$id));

		// Process event trigger
		$this->id = $id;
		$this->acct = substr($id,0,4);
		$this->sub = substr($id,4,2);
		$this->qualifier = substr($id,6,1);
		$this->type = substr($id,7,3);
		$this->area = substr($id,10,2);
		$this->info = substr($id,12,3);
		$this->checksum = substr($id,15,1);
		$this->datetime = $dt;

		// Check the event is from a valid account
		// @todo This shouldnt stop program execution, rather it should generate an email to an admin
		$ao = ORM::factory('account',array('alarmphone'=>$cf,'siteid'=>$this->acct));
		if (! $ao->loaded())
			throw new Kohana_Exception('Event from unknown account :id is not valid',array(':id'=>$ao->id));

		$eo = ORM::factory('event');
		$eo->account_id = $ao->id;
		$eo->alarmevent = $id;
		$eo->datetime = $dt;
		$eo->save();

		// @todo This shouldnt stop program execution, rather it should generate an email to an admin
		if (! $eo->saved())
			throw new Kohana_Exception('ContactID event :event is not valid',array(':event'=>$id));

		return $this;
	}

	public function __get($k) {
		if (isset($this->{$k}))
			return $this->{$k};
		else
			throw new Kohana_Exception('Unknown property :property',array(':property'=>$k));;
	}

	// Check that this event is valid
	private function check($id) {
		$checksum_map = array(
			'0'=>10,
			'1'=>1,
			'2'=>2,
			'3'=>3,
			'4'=>4,
			'5'=>5,
			'6'=>6,
			'7'=>7,
			'8'=>8,
			'9'=>9,
			'*'=>11,
			'#'=>12,
			'A'=>13,
			'B'=>14,
			'C'=>15,
		);

		if (strlen($id) != 16)
			throw new Kohana_Exception('ContactID event :event has an invalid length :length',array(':event'=>$id,':length'=>strlen($id)));

		// Our checksum should be mod15
		$c = $t = 0;
		while ($c<strlen($id))
			$t += $checksum_map[substr($id,$c++,1)];

		if ($t%15 === 0)
			return TRUE;
		else
			return FALSE;
	}
}
?>