<?php

/**
  * BLOG:CMS: PHP/MySQL Personal Content Management System (CMS)
  * http://blogcms.com/
  * ----------------------------------------------------------------
  *
  * Copyright (C) 2003-2005 Radek HULÁN
  * http://hulan.cz/contact/
  *
  * Based on: 
  * ----------------------------------------------------------------
  * Nucleus: PHP/MySQL Weblog CMS (http://nucleuscms.org/) 
  * Copyright (C) 2002-2003 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.
**/

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);
		$obj = sql_fetch_object($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='".sql_escape($ip)."'";
		$res = sql_query($query);
		return (sql_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.",'".sql_escape(serverVar('REMOTE_ADDR'))."')";
		sql_query($query);
	}
}

?>