<?php
# Lifter002: TODO
# Lifter007: TODO
# Lifter003: TODO
# Lifter010: TODO
// +--------------------------------------------------------------------------+
// 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_EVALDB;
require_once EVAL_FILE_OBJECT;
require_once EVAL_FILE_GROUP;
# ====================================================== end: including files #


# Define all required constants ============================================= #
/**
 * @const INSTANCEOF_EVAL Is instance of an evaluation object
 * @access public
 */
define("INSTANCEOF_EVAL", "Evaluation");
# ===================================================== end: define constants #


/**
 * The mainclass for an evaluation for the Stud.IP-project.
 *
 * @author  Alexander Willner <mail@AlexanderWillner.de>
 *
 * @copyright   2004 Stud.IP-Project
 * @access      public
 * @package     evaluation
 *
 */
class Evaluation extends EvaluationObject implements PrivacyObject
{
# Define all required variables ============================================= #
    /**
     * Startdate
     * @access   private
     * @var      integer $startdate
     */
    var $startdate;

    /**
     * Stopdate
     * @access   private
     * @var      integer $stopdate
     */
    var $stopdate;

    /**
     * Timespan
     * @access   private
     * @var      integer $timespan
     */
    var $timespan;

    /**
     * Time of creation. Is set automatically.
     * @access   private
     * @var      integer $mkdate
     */
    var $mkdate;

    /**
     * Time of last change. Is set automatically.
     * @access   private
     * @var      integer $chdate
     */
    var $chdate;

    /**
     * Defines wheter the evaluation is anonymous
     * @access   private
     * @var      boolean $anonymous
     */
    var $anonymous;

    /**
     * Defines whether the evaluation is visible
     * @access   private
     * @var      boolean $visible
     */
    var $visible;

    /**
     * Defines whether the evaluation template is shared
     * @access   private
     * @var      boolean $shared
     */
    var $shared;

    /**
     * Counts the number of connected ranges
     * @access   private
     * @var      integer $numberRanges
     */
    var $numberRanges;

    /**
     * Counts the number of connected ranges
     * @access   private
     * @var      integer $rangeNum
     */
    var $rangeNum;

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

        $this->rangeID = [];
        $this->startdate = NULL;
        $this->stopdate = NULL;
        $this->timespan = NULL;
        $this->mkdate = time();
        $this->chdate = time();
        $this->anonymous = NO;
        $this->visible = NO;
        $this->shared = NO;
        $this->rangeNum = 0;
        $this->db = new EvaluationDB ();
        if ($this->db->isError()) {
            return $this->throwErrorFromClass($this->db);
        }
        $this->init($objectID);
    }

    /**
     * Sets the startdate
     * @access  public
     * @param integer $startdate The startdate.
     * @throws  error
     */
    public function setStartdate($startdate)
    {
        if (!empty ($startdate)) {
            if (!empty ($this->stopdate) && $startdate > $this->stopdate) {
                return $this->throwError(1, _("Das Startdatum ist nach dem Stoppdatum."));
            }
            if ($startdate <= 0) {
                return $this->throwError(1, _("Das Startdatum ist leider ungültig."));
            }
        }
        $this->startdate = $startdate;
    }

    /**
     * Gets the startdate
     * @access  public
     * @return  integer  The startdate
     */
    public function getStartdate()
    {
        return $this->startdate;
    }

    /**
     * Sets the stopdate
     * @access  public
     * @param integer $stopdate The stopdate.
     * @throws  error
     */
    public function setStopdate($stopdate)
    {
        if (!empty ($stopdate)) {
            if ($stopdate <= 0)
                return $this->throwError(1, _("Das Stoppdatum ist leider ungültig."));
            if ($stopdate < $this->startdate)
                return $this->throwError(1, _("Das Stoppdatum ist vor dem Startdatum."));
            if (!empty ($this->timespan))
                $this->timespan = NULL;
        }
        $this->stopdate = $stopdate;
    }

    /**
     * Gets the stopdate
     * @access  public
     * @return  string  The stopdate
     */
    public function getStopdate()
    {
        return $this->stopdate;
    }

    /**
     * Gets the real stop date as a UNIX-timestamp (e.g. startdate + timespan)
     * @access  public
     * @return  integer The UNIX-timestamp with the real stopdate
     */
    public function getRealStopdate()
    {
        $stopdate = $this->getStopdate();

        if ($this->getTimespan() != NULL)
            $stopdate = $this->getStartdate() + $this->getTimespan();

        return $stopdate;
    }

    /**
     * Sets the timespan
     * @access  public
     * @param string $timespan The timespan.
     * @throws  error
     */
    public function setTimespan($timespan)
    {
        if (!empty ($timespan) && !empty ($this->stopdate))
            $this->stopdate = NULL;
        $this->timespan = $timespan;
    }

    /**
     * Gets the timespan
     * @access  public
     * @return  string  The timespan
     */
    public function getTimespan()
    {
        return $this->timespan;
    }

    /**
     * Gets the creationdate
     * @access  public
     * @return  integer  The creationdate
     */
    public function getCreationdate()
    {
        return $this->mkdate;
    }

    /**
     * Gets the changedate
     * @access  public
     * @return  integer  The changedate
     */
    public function getChangedate()
    {
        return $this->chdate;
    }

    /**
     * Sets anonymous
     * @access  public
     * @param string $anonymous The anonymous.
     * @throws  error
     */
    public function setAnonymous($anonymous)
    {
        $this->anonymous = $anonymous == YES ? YES : NO;
    }

    /**
     * Gets anonymous
     * @access  public
     * @return  string  The anonymous
     */
    public function isAnonymous()
    {
        return $this->anonymous == YES ? YES : NO;
    }

    /**
     * Sets visible
     * @access  public
     * @param string $visible The visible.
     * @throws  error
     */
    public function setVisible($visible)
    {
        $this->visible = $visible == YES ? YES : NO;
    }

    /**
     * Gets visible
     * @access  public
     * @return  string  The visible
     */
    public function isVisible()
    {
        return $this->visible == YES ? YES : NO;
    }

    /**
     * Set shared for a public search
     * @access  public
     * @param boolean $shared if true it is shared
     */
    public function setShared($shared)
    {
        if ($shared == YES && $this->isTemplate() == NO)
            return $this->throwError(1, _("Nur ein Template kann freigegeben werden"));
        $this->shared = $shared == YES ? YES : NO;
    }

    /**
     * Is shared for a public search?
     * @access  public
     * @return  boolen  true if it is shared template
     */
    public function isShared()
    {
        return $this->shared == YES ? YES : NO;
    }

    /**
     * Is this evaluation a template?
     * @access  public
     * @return  boolen  true if it is a template
     */
    public function isTemplate()
    {
        return empty ($this->rangeID) ? YES : NO;
    }

    /**
     * Has a user used this evaluation?
     * @access  public
     * @param string $userID Optional an user id
     * @return  string  YES if a user used this evaluation
     */
    public function hasVoted($userID = "")
    {
        return $this->db->hasVoted($this->getObjectID(), $userID);
    }

    /**
     * Removes a range from the object (not from the DB!)
     * @access  public
     * @param string $rangeID The range id
     */
    public function removeRangeID($rangeID)
    {
        $temp = [];
        while ($oldRangeID = $this->getNextRangeID()) {
            if ($oldRangeID != $rangeID) {
                $temp[] = $oldRangeID;
            }
        }
        $this->rangeID = $temp;
        $this->numberRanges = count($temp);
    }

    /**
     * Removes all rangeIDs
     * @access   public
     */
    public function removeRangeIDs()
    {
        while ($this->getRangeID()) ;
    }

    /**
     * Adds a rangeID
     * @access  public
     * @param string $rangeID The rangeID
     * @throws  error
     */
    public function addRangeID($rangeID)
    {
        $this->rangeID[] = $rangeID;
        $this->numberRanges++;
    }

    /**
     * Gets the first rangeID and removes it
     * @access  public
     * @return  string  The first object
     */
    public function getRangeID()
    {
        if ($this->numberRanges)
            $this->numberRanges--;
        return array_pop($this->rangeID);
    }

    /**
     * Gets the next rangeID
     * @access  public
     * @return  string   The rangeID
     */
    public function getNextRangeID()
    {
        if ($this->rangeNum >= $this->numberRanges) {
            $this->rangeNum = 0;
            return NULL;
        }
        return $this->rangeID[$this->rangeNum++];
    }

    /**
     * Gets all the rangeIDs from the evaluation
     * @access  public
     * @return  array  An array full of rangeIDs
     */
    public function getRangeIDs()
    {
        return $this->rangeID;
    }

    /**
     * Gets the number of ranges
     * @access  public
     * @return  integer  Number of ranges
     */
    public function getNumberRanges()
    {
        return $this->numberRanges;
    }

    /**
     * Resets all answers for this evaluation
     * @access public
     */
    public function resetAnswers()
    {
        // Für diesen Mist habe ich jetzt ca. 3 Stunden gebraucht :(
        $answers = $this->getSpecialChildobjects($this, INSTANCEOF_EVALANSWER);

        $number = count($answers);
        for ($i = 0; $i < $number; $i++) {
            $answer = &$answers[$i];
#while ($answer->getUserID ()); // delete users...
            $answer->db->resetVotes($answer);
        }

    }

    /**
     * Export available data of a given user into a storage object
     * (an instance of the StoredUserData class) for that user.
     *
     * @param StoredUserData $storage object to store data into
     */
    public static function exportUserData(StoredUserData $storage)
    {
        $field_data = DBManager::get()->fetchAll("SELECT * FROM eval WHERE author_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('Evaluation'), 'eval', $field_data);
        }

        $field_data = DBManager::get()->fetchAll("SELECT * FROM evalanswer_user WHERE user_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('EvaluationAnswerUser'), 'evalanswer_user', $field_data);
        }

        $field_data = DBManager::get()->fetchAll("SELECT * FROM eval_group_template WHERE user_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('EvaluationGroupTemplate'), 'eval_group_template', $field_data);
        }

        $field_data = DBManager::get()->fetchAll("SELECT * FROM eval_templates WHERE user_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('EvaluationTemplates'), 'eval_templates', $field_data);
        }

        $field_data = DBManager::get()->fetchAll("SELECT * FROM eval_templates_user WHERE user_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('EvaluationTemplatesUser'), 'eval_templates_user', $field_data);
        }

        $field_data = DBManager::get()->fetchAll("SELECT * FROM eval_user WHERE user_id = ?", [$storage->user_id]);
        if ($field_data) {
            $storage->addTabularData(_('EvaluationUser'), 'eval_user', $field_data);
        }

    }

    /**
     * Sets the creationdate
     * @access  private
     * @param integer $creationdate The creationdate.
     * @throws  error
     */
    public function setCreationdate($creationdate)
    {
        $this->mkdate = $creationdate;
    }

    /**
     * Sets the changedate
     * @access  private
     * @param integer $changedate The changedate.
     * @throws  error
     */
    public function setChangedate($changedate)
    {
        $this->chdate = $changedate;
    }

    /**
     * Checks if object is in a valid state
     * @access private
     */
    public function check()
    {
        parent::check();
        if (empty ($this->title)) {
            $this->throwError(1, _("Der Titel darf nicht leer sein."));
        }

        if ($this->isTemplate() && $this->hasVoted()) {
            $this->throwError(2, _("Ungültiges Objekt: Bei einer Vorlage wurde abgestimmt."));
        }

        if (!$this->isTemplate() && $this->isShared()) {
            $this->throwError(3, _("Ungültiges Objekt: Eine aktive Evaluation wurde freigegeben."));
        }

    }
}