<?php
/*
 * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/)
 * Copyright (C) 2002-2009 The Nucleus Group
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * (see nucleus/documentation/index.html#license for more info)
 */
/**
 * Class representing the karma votes for a certain item
 *
 * @license http://nucleuscms.org/license.txt GNU General Public License
 * @copyright Copyright (C) 2002-2009 The Nucleus Group
 * @version $Id$
 * $NucleusJP: KARMA.php,v 1.5 2006/07/17 20:03:44 kimitake Exp $
 */
class KARMA {

	// id of item about which this object contains information
	var $itemid;

	// indicates if the karma vote info has already been intialized from the DB
	var $inforead;

	// amount of positive/negative votes
	var $karmapos;
	var $karmaneg;

	function KARMA($itemid, $initpos = 0, $initneg = 0, $initread = 0) {
		// itemid
		$this->itemid = intval($itemid);

		// have we read the karma info yet?
		$this->inforead = intval($initread);

		// number of positive and negative votes
		$this->karmapos = intval($initpos);
		$this->karmaneg = intval($initneg);
	}

	function getNbPosVotes() {
		if (!$this->inforead) $this->readFromDatabase();
		return $this->karmapos;
	}
	function getNbNegVotes() {
		if (!$this->inforead) $this->readFromDatabase();
		return $this->karmaneg;
	}
	function getNbOfVotes() {
		if (!$this->inforead) $this->readFromDatabase();
		return ($this->karmapos + $this->karmaneg);
	}
	function getTotalScore() {
		if (!$this->inforead) $this->readFromDatabase();
		return ($this->karmapos - $this->karmaneg);
	}

	function setNbPosVotes($val) {
		$this->karmapos = intval($val);
	}
	function setNbNegVotes($val) {
		$this->karmaneg = intval($val);
	}


	// adds a positive vote
	function votePositive() {
		$newKarma = $this->getNbPosVotes() + 1;
		$this->setNbPosVotes($newKarma);
		$this->writeToDatabase();
		$this->saveIP();
	}

	// adds a negative vote
	function voteNegative() {
		$newKarma = $this->getNbNegVotes() + 1;
		$this->setNbNegVotes($newKarma);
		$this->writeToDatabase();
		$this->saveIP();
	}


	// these methods shouldn't be called directly
	function readFromDatabase() {
		$query = 'SELECT ikarmapos, ikarmaneg FROM '.sql_table('item').' WHERE inumber=' . $this->itemid;
		$res = sql_query($query);
		$obj = mysql_fetch_object($res);

		$this->karmapos = $obj->ikarmapos;
		$this->karmaneg = $obj->ikarmaneg;
		$this->inforead = 1;
	}


	function writeToDatabase() {
		$query = 'UPDATE '.sql_table('item').' SET ikarmapos=' . $this->karmapos . ', ikarmaneg='.$this->karmaneg.' WHERE inumber=' . $this->itemid;
		sql_query($query);
	}

	// checks if a vote is still allowed for an IP
	function isVoteAllowed($ip) {
		$query = 'SELECT * FROM '.sql_table('karma')." WHERE itemid=$this->itemid and ip='".addslashes($ip)."'";
		$res = sql_query($query);
		return (mysql_num_rows($res) == 0);
	}

	// save IP in database so no multiple votes are possible
	function saveIP() {
		$query = 'INSERT INTO '.sql_table('karma').' (itemid, ip) VALUES ('.$this->itemid.",'".addslashes(serverVar('REMOTE_ADDR'))."')";
		sql_query($query);
	}
}

?>