<?php
# Lifter002: TODO
# Lifter007: TODO
# Lifter003: TODO
# Lifter010: TODO
/**
 * Beschreibung
 *
 * @author      Alexander Willner <mail@AlexanderWillner.de>
 * @copyright   2004 Stud.IP-Project
 * @access      public
 * @package     evaluation
 * @modulegroup evaluation_modules
 *
 */

// +--------------------------------------------------------------------------+
// This file is part of Stud.IP
// Copyright (C) 2001-2004 Stud.IP
// +--------------------------------------------------------------------------+
// 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 any later version.
// +--------------------------------------------------------------------------+
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// +--------------------------------------------------------------------------+

# Include all required files ================================================ #
require_once 'lib/evaluation/evaluation.config.php';
require_once EVAL_FILE_ANSWERDB;
require_once EVAL_FILE_OBJECT;

/**
 * @const INSTANCEOF_EVALANSWER Is instance of an evaluationanswer object
 * @access public
 */
define("INSTANCEOF_EVALANSWER", "EvaluationAnswer");

class EvaluationAnswer extends EvaluationObject
{

    /**
     * The value for an answer
     * @access   private
     * @var      integer $value ;
     */
    var $value;

    /**
     * If >0 the answer is a freetext with $rows rows
     * @access   private
     * @var      integer $rows
     */
    var $rows;

    /**
     * The userIDs of users who voted for this answer
     * @access   private
     * @var      array $users
     */
    var $users;

    /**
     * The number of users voted for this answer
     * @access   private
     * @var      integer $userNum
     */
    var $userNum;

    /**
     * For internal use (getNextUserID)
     * @access   private
     * @var      integer $userNumIterator
     */
    var $userNumIterator;

    /**
     * If true this is the residual answer for a question
     * @access   private
     * @var      boolean $residual
     */
    var $residual;

    /**
     * Constructor
     * @access   public
     * @param string $objectID The ID of an existing answer
     * @param object $parentObject The parent object if exists
     * @param integer $loadChildren See const EVAL_LOAD_*_CHILDREN
     */
    public function __construct($objectID = "", $parentObject = null, $loadChildren = EVAL_LOAD_NO_CHILDREN)
    {
        /* Set default values ------------------------------------------------- */
        parent::__construct($objectID, $parentObject, $loadChildren);
        $this->instanceof = INSTANCEOF_EVALANSWER;

        $this->value = 0;
        $this->rows = 0;
        $this->users = [];
        $this->userNum = 0;
        $this->userNumIterator = 0;
        $this->residual = NO;

        $this->db = new EvaluationAnswerDB ();
        if ($this->db->isError()) {
            return $this->throwErrorFromClass($this->db);
        }
        $this->init($objectID);

    }

    /**
     * Gets the number of votes for this answer
     * @access  public
     * @return  string  The counter of the answer
     */
    public function getNumberOfVotes()
    {
        return $this->userNum;
    }

    /**
     * Gets the number of rows from freetext answers
     * @access   public
     * @return   integer   The number of rows
     */
    public function getRows()
    {
        return $this->rows;
    }

    /**
     * Gets the number of rows for freetext answers
     * @access   public
     * @param integer $rows The number of rows
     */
    public function setRows($rows)
    {
        $this->rows = $rows;
    }

    /**
     * Gets the value of an answer
     * @access   public
     * @return   integer   The value
     */
    public function getValue()
    {
        return $this->value;;
    }

    /**
     * Sets the value of an answer
     * @access   public
     * @param integer $value The value
     */
    public function setValue($value)
    {
        $this->value = $value;
    }

    /**
     * Checks whether the answer is a residual answer
     * @access   public
     * @return   boolean   YES if it is a residual answer
     */
    public function isResidual()
    {
        return $this->residual == YES ? YES : NO;
    }

    /**
     * Sets the answers as an residual answer
     * @access   public
     * @param boolean $boolean YES to set it as a residual answer
     */
    public function setResidual($boolean)
    {
        $this->residual = $boolean == YES ? YES : NO;
    }

    /**
     * Vote for this answer
     * @access  public
     * @param string $userID The user id
     */
    public function vote($userID)
    {
        $this->addUserID($userID);
    }

    /**
     * Non-Anonymous vote for this answer
     * @access  public
     * @param string $userID The user id
     */
    public function addUserID($userID)
    {
        if (empty ($userID)) {
            return $this->throwError(1, _("Nur pseudonyme Abstimmung erlaubt! Neue ID mit StudipObject::createNewID () erzeugen"));
        }

        $this->userNum++;
        array_push($this->users, $userID);
    }

    /**
     * Gets the first user and removes it
     * @access  public
     * @return  string  The first user id
     */
    public function getUserID()
    {
        if ($this->userNum > 0)
            $this->userNum--;
        return array_pop($this->users);
    }

    /**
     * Gets the next user
     * @access  public
     * @return  string  The next user id, otherwise NULL
     */
    public function getNextUserID()
    {
        if ($this->userNumIterator >= $this->userNum) {
            $this->userNumIterator = 0;
            return NULL;
        }
        return $this->users[$this->userNumIterator++];
    }

    /**
     * Gets all the user ids
     * @access  public
     * @return  array  An array full of user ids
     */
    public function getUserIDs()
    {
        return $this->users;
    }

    /**
     * @access public
     * @return integer  YES, if the Answer is a textfield
     */
    public function isFreetext()
    {
        return ($this->rows == 0) ? NO : YES;
    }

    /**
     * Checks if object is in a valid state
     * @access private
     */
    public function check()
    {
        parent::check();
    }

    /**
     * Debugfunction
     * @access   private
     */
    public function toString()
    {
        parent::toString();
        echo "Anzahl der Stimmen: " . $this->getNumberOfVotes() . "<br>\n";
    }
}