<?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.
// +--------------------------------------------------------------------------+


require_once 'lib/evaluation/evaluation.config.php';
require_once EVAL_FILE_OBJECTDB;
require_once EVAL_FILE_GROUPDB;


/**
 * @const EVAL_STATE_NEW Beschreibung
 * @access public
 */
define("EVAL_STATE_NEW", "new");

/**
 * @const EVAL_STATE_ACTIVE Beschreibung
 * @access public
 */
define("EVAL_STATE_ACTIVE", "active");

/**
 * @const EVAL_STATE_STOPPED Beschreibung
 * @access public
 */
define("EVAL_STATE_STOPPED", "stopped");
# =========================================================================== #


/**
 * Databaseclass for all evaluations
 *
 * @author  Alexander Willner <mail@AlexanderWillner.de>
 *
 * @copyright   2004 Stud.IP-Project
 * @access      public
 * @package     evaluation
 *
 */
class EvaluationDB extends EvaluationObjectDB
{

    public function __construct()
    {
        parent::__construct();
        $this->instanceof = 'EvalDB';
    }

    /**
     * Loads an evaluation from DB into an object
     *
     * @access public
     * @param object EvaluationObject &$evalObject  The evaluation to load
     * @throws error
     */
    public function load(&$evalObject)
    {
        $row = DBManager::get()->fetchOne("SELECT * FROM eval WHERE eval_id = ?", [$evalObject->getObjectID()]);

        if (!count($row)) {
            return $this->throwError(1, _("Keine Evaluation mit dieser ID gefunden."));
        }

        $evalObject->setAuthorID($row['author_id']);
        $evalObject->setTitle($row['title']);
        $evalObject->setText($row['text']);
        $evalObject->setStartdate($row['startdate']);
        $evalObject->setStopdate($row['stopdate']);
        $evalObject->setTimespan($row['timespan']);
        $evalObject->setCreationdate($row['mkdate']);
        $evalObject->setChangedate($row['chdate']);
        $evalObject->setAnonymous($row['anonymous']);
        $evalObject->setVisible($row['visible']);
        $evalObject->setShared($row['shared']);

        $range_ids = DBManager::get()->fetchFirst("SELECT range_id FROM eval_range WHERE eval_id = ?",
            [$evalObject->getObjectID()]);

        foreach ($range_ids as $range_id) {
            $evalObject->addRangeID($range_id);
        }
        if ($evalObject->loadChildren != EVAL_LOAD_NO_CHILDREN) {
            EvaluationGroupDB::addChildren($evalObject);
        }
    }

    /**
     * Saves an evaluation
     * @access public
     * @param object   Evaluation  &$evalObject  The evaluation to save
     * @throws  error
     */
    public function save(&$evalObject)
    {
        $startdate = $evalObject->getStartdate();
        $stopdate = $evalObject->getStopdate();
        $timespan = $evalObject->getTimespan();

        $evalObject->setChangedate(time());
        if ($this->exists($evalObject->getObjectID())) {
            DBManager::get()->execute(
                "UPDATE eval SET title = ?, text = ?, startdate = ?,
                stopdate = ?, timespan = ?, mkdate = ?,
                chdate = ?, anonymous = ?, visible = ?, shared = ?
             WHERE eval_id = ?",
                [$evalObject->getTitle(), $evalObject->getText(),
                    $startdate, $stopdate, $timespan, $evalObject->getCreationdate(),
                    $evalObject->getChangedate(), $evalObject->isAnonymous(),
                    $evalObject->isVisible(), $evalObject->isShared(), $evalObject->getObjectID()]);
        } else {
            DBManager::get()->execute(
                "INSERT INTO eval SET eval_id = ?,
                author_id = ?, title = ?, text = ?, startdate = ?,
                stopdate = ?, timespan = ?, mkdate = ?, chdate = ?,
                anonymous = ?, visible = ?, shared = ?",
                [$evalObject->getObjectID(), $evalObject->getAuthorID(),
                    $evalObject->getTitle(), $evalObject->getText(),
                    $startdate, $stopdate, $timespan, $evalObject->getCreationdate(),
                    $evalObject->getChangedate(), $evalObject->isAnonymous(),
                    $evalObject->isVisible(), $evalObject->isShared()]);
        }
        DBManager::get()->execute("DELETE FROM eval_range WHERE eval_id  = ?", [$evalObject->getObjectID()]);

        while ($rangeID = $evalObject->getNextRangeID()) {
            DBManager::get()->execute("INSERT INTO eval_range SET eval_id  = ?, range_id = ?",
                [$evalObject->getObjectID(), $rangeID]);
        }
    }

    /**
     * Deletes an evaluation
     * @access public
     * @param object   Evaluation  &$evalObject  The evaluation to delete
     * @throws  error
     */
    public function delete(&$evalObject)
    {
        DBManager::get()->execute("DELETE FROM eval WHERE eval_id  = ?", [$evalObject->getObjectID()]);

        DBManager::get()->execute("DELETE FROM eval_range WHERE eval_id  = ?", [$evalObject->getObjectID()]);
        DBManager::get()->execute("DELETE FROM eval_user WHERE eval_id  = ?", [$evalObject->getObjectID()]);

    }

    /**
     * Checks if evaluation with this ID exists
     * @access  public
     * @param string $evalID The evalID
     * @return  bool     YES if exists
     */
    public function exists($evalID)
    {
        $entry = DBManager::get()->fetchOne("SELECT 1 FROM eval WHERE eval_id = ?", [$evalID]);
        if (count($entry) > 0)
            return true;
        return false;
    }

    /**
     * Checks if someone used the evaluation
     * @access  public
     * @param string $evalID The eval id
     * @param string $userID The user id
     * @return  bool     YES if evaluation was used
     */
    public function hasVoted($evalID, $userID = "")
    {
        /* ask database ------------------------------------------------------- */
        $sql = "SELECT 1 FROM eval_user WHERE eval_id = ?";
        if (empty($userID))
            $entry = DBManager::get()->fetchOne($sql, [$evalID]);
        else
            $entry = DBManager::get()->fetchOne($sql . " AND user_id = ?", [$evalID, $userID]);
        /* --------------------------------------------------------- end: asking */
        if (count($entry) > 0)
            return true;
        return false;
    }

    /**
     * Returns the type of an objectID
     * @access public
     * @param string $objectID The objectID
     * @return string  INSTANCEOF_x, else NO
     */
    public function getType($objectID)
    {
        if ($this->exists($objectID)) {
            return INSTANCEOF_EVAL;
        } else {
            $dbObject = new EvaluationGroupDB();
            return $dbObject->getType($objectID);
        }
    }

    /**
     * Connect a user with an evaluation
     * @access   public
     * @param string $evalID The evaluation id
     * @param string $userID The user id
     */
    public function connectWithUser($evalID, $userID)
    {
        if (empty($userID))
            die ("EvaluationDB::connectWithUser: UserID leer!!");
        DBManager::get()->execute("INSERT IGNORE INTO eval_user SET eval_id = ?, user_id = ?", [$evalID, $userID]);
    }

    /**
     * Removes the connection of an evaluation with a user or all users
     * @access   public
     * @param string $evalID The evaluation id
     * @param string $userID The user id
     */
    public function removeUser($evalID, $userID = "")
    {
        $sql = "DELETE FROM eval_user WHERE eval_id  = ?";

        if (empty($userID))
            DBManager::get()->execute($sql, [$evalID]);
        else
            DBManager::get()->execute($sql . " AND user_id = ?", [$evalID, $userID]);
    }

    /**
     * Get number of users who participated in the eval
     * @access public
     * @param string $evalID The eval id
     * @return integer  The number of users
     */
    public static function getNumberOfVotes($evalID)
    {
        return DBManager::get()->fetchColumn("SELECT count(DISTINCT user_id) AS number FROM eval_user WHERE eval_id = ?", [$evalID]);
    }

    /**
     * Get users who participated in the eval
     * @access public
     * @param string $evalID The eval id
     * @param array $answerIDs The answerIDs to get the pseudonym users
     * @return string[] Ids of the users who voted
     */
    public static function getUserVoted($evalID, $answerIDs = [], $questionIDs = [])
    {
        $sql = "SELECT DISTINCT user_id FROM ";

        if (empty($answerIDs) && empty($questionIDs)) {
            $sql .= "eval_user WHERE eval_id = ?";
            $search_criteria = $evalID;
        } elseif (empty ($questionIDs)) {
            $sql .= "evalanswer_user WHERE evalanswer_id IN (?)";
            $search_criteria = $answerIDs;
        } else {
            $sql .= "evalanswer INNER JOIN evalanswer_user USING(evalanswer_id) WHERE parent_id IN (?)";
            $search_criteria = $questionIDs;
        }

        return DBManager::get()->fetchFirst($sql, [$search_criteria]);
    }

    /**
     *
     * @access public
     * @param string $search_str
     * @return array
     */
    public function search_range($search_str)
    {
        return search_range($search_str, true);
    }
}