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<?php
/**
* banner.php - model class for the banner administration
*
* 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.
*
* @author Nico Müller <nico.mueller@uni-oldenburg.de>
* @copyright 2012 Stud.IP Core-Group
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
* @package admin
* @since 2.4
*
* @property string $id alias column for ad_id
* @property string $ad_id database column
* @property string $banner_path database column
* @property string|null $description database column
* @property string|null $alttext database column
* @property string $target_type database column
* @property string $target database column
* @property int $startdate database column
* @property int $enddate database column
* @property int $priority database column
* @property int $views database column
* @property int $clicks database column
* @property int $mkdate database column
* @property int $chdate database column
* @property SimpleORMapCollection<BannerRoles> $banner_roles has_many BannerRoles
*/
class Banner extends SimpleORMap
{
protected static function configure($config = [])
{
$config['db_table'] = 'banner_ads';
$config['has_many']['banner_roles'] = [
'class_name' => BannerRoles::class,
'assoc_foreign_key' => 'ad_id',
'on_delete' => 'delete'
];
parent::configure($config);
}
/**
* Returns a random banner
*/
public static function getRandomBanner()
{
$query = "SELECT ad_id, priority, startdate, enddate
FROM banner_ads
WHERE priority > 0
AND (startdate = 0 OR startdate < UNIX_TIMESTAMP())
AND (enddate = 0 OR enddate > UNIX_TIMESTAMP())";
$statement = DBManager::get()->query($query);
// array that contains banner ids and an offset
// offsets start with 0 and increase by pow(2, priority)
// a random number between 0 and sum(pow(2,priorities)) is
// drawn and the banner with the highest offset smaller than
// this number is chosen
$banners = [];
$sum = 0;
// collect banners to consider, build banners array
while ($row = $statement->fetch(PDO::FETCH_ASSOC)) {
if (BannerRoles::checkUserAccess($row['ad_id'])) {
$sum += pow(2, $row['priority']);
$banners[] = [
'ad_id' => $row['ad_id'],
'offset' => $sum
];
}
}
// draw random number and select banner
$x = mt_rand(0, $sum);
$ad_id = false;
foreach ($banners as $i) {
if ($i['offset'] >= $x) {
$ad_id = $i['ad_id'];
break;
}
}
return new Banner($ad_id);
}
/**
* Get all banners
*
* @return array() list of banners
*/
public static function getAllBanners()
{
$query = "SELECT ad_id FROM banner_ads ORDER BY priority DESC";
$statement = DBManager::get()->query($query);
$ids = $statement->fetchAll(PDO::FETCH_COLUMN);
$banners = [];
foreach ($ids as $id) {
$banners[$id] = new Banner($id);
}
return $banners;
}
/**
* delete entry from database
* the object is cleared and turned to new state
* @return boolean
*/
public function delete()
{
if (!$this->isNew()) {
// Remove banner file
unlink($GLOBALS['DYNAMIC_CONTENT_PATH'] . '/banner/' . $this->banner_path);
}
return parent::delete();
}
/*
* Check the priority for a banner
* @param Int $prio priority (1-10)
* @return
*/
public function getViewProbability()
{
static $computed = false, $sum = null;
if ($this->priority == 0) {
return '--';
}
if ($computed === false) {
$sum = DBManager::get()->query("SELECT SUM(POW(2, priority)) FROM banner_ads WHERE priority > 0")
->fetchColumn();
$computed = true;
}
// return '1/' . (1 / (pow(2, $prio) / $sum));
return number_format(100 / (1 / (pow(2, $this->priority) / $sum)), 2, ',', '.') . '%';
}
/**
* Returns the appropriate link for this banner.
*
* @return string
*/
public function getLink($internal = false)
{
if ($this->isNew()) {
return '';
}
if ($internal) {
return URLHelper::getLink('dispatch.php/banner/click/' . $this->ad_id);
}
if ($this->target_type === 'url') {
return $this->target;
}
if ($this->target_type === 'seminar') {
return URLHelper::getLink('dispatch.php/course/details/', ['sem_id' => $this->target]);
}
if ($this->target_type === 'user') {
return URLHelper::getLink('dispatch.php/profile', ['username' => $this->target]);
}
if ($this->target_type === 'inst') {
return URLHelper::getLink(
'dispatch.php/institute/overview',
['auswahl' => $this->target]
);
}
return '';
}
/**
* Returns the img-tag for this banner
*
* @return string
*/
public function toImg($attributes = [])
{
$attr = [
'src' => $GLOBALS['DYNAMIC_CONTENT_URL'] . '/banner/' . $this->banner_path,
'border' => '0',
];
if ($this->alttext) {
$attr['title'] = $attr['alt'] = $this->alttext;
}
$attr = array_merge($attr, $attributes);
$attr_string = '';
foreach ($attr as $key => $value) {
$attr_string .= sprintf(' %s="%s"', $key, htmlReady($value));
}
return '<img' . $attr_string . '>';
}
/**
* Returns the complete html (link + img) for this banner
*
* @return string
*/
public function toHTML($internal = true)
{
if ($this->isNew()) {
return '';
}
if ($this->target_type === 'url') {
$template = '<a href="%s" target="_blank" rel="noopener noreferrer">%s</a>';
} elseif ($this->target_type === 'none') {
$template = '%2$s';
} else {
$template = '<a href="%s">%s</a>';
}
$link = sprintf($template, $this->getLink($internal), $this->toImg());
$this->views += 1;
$this->store();
return sprintf('<div class="studip-banner">%s</div>', $link);
}
}
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