Deprecate `StudipAutoloader` and use composer's `autoload`

Closes #4282

Merge request studip/studip!3099

1 files changed, 819 insertions, 0 deletions

diff --git a/lib/models/SeminarCycleDate.php b/lib/models/SeminarCycleDate.php
new file mode 100644
index 0000000..f384426
--- /dev/null
+++ b/lib/models/SeminarCycleDate.php
@@ -0,0 +1,819 @@
+<?php
+
+
+//Do not remove! This is still needed for the toString method!
+require_once 'lib/dates.inc.php';
+
+
+/**
+ * SeminarCycleDate.class.php
+ * model class for table seminar_cycle_dates
+ *
+ * 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      André Noack <noack@data-quest.de>
+ * @license     http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
+ * @category    Stud.IP
+ * @since       2.0
+ *
+ * @property string $id alias column for metadate_id
+ * @property string $metadate_id database column
+ * @property string $seminar_id database column
+ * @property string $start_time database column
+ * @property string $end_time database column
+ * @property int $weekday database column
+ * @property string $description database column
+ * @property float $sws database column
+ * @property int $cycle database column
+ * @property int $week_offset database column
+ * @property int|null $end_offset database column
+ * @property int $sorter database column
+ * @property int $mkdate database column
+ * @property int $chdate database column
+ * @property SimpleORMapCollection|RoomRequest[] $room_requests has_many RoomRequest
+ * @property SimpleORMapCollection|CourseDate[] $dates has_many CourseDate
+ * @property SimpleORMapCollection|CourseExDate[] $exdates has_many CourseExDate
+ * @property Course $course belongs_to Course
+ * @property mixed $start_hour additional field
+ * @property mixed $start_minute additional field
+ * @property mixed $end_hour additional field
+ * @property mixed $end_minute additional field
+ * @property-read mixed $is_visible additional field
+ */
+class SeminarCycleDate extends SimpleORMap
+{
+    /**
+     * Configures this model.
+     *
+     * @param Array $config Configuration array
+     */
+    protected static function configure($config = [])
+    {
+        $config['db_table'] = 'seminar_cycle_dates';
+        $config['belongs_to']['course'] = array(
+            'class_name' => Course::class,
+            'foreign_key' => 'seminar_id',
+        );
+        $config['has_many']['room_requests'] = [
+            'class_name' => RoomRequest::class,
+            'on_store'   => 'store',
+            'on_delete'  => 'delete',
+            'assoc_func' => 'findByMetadate_id'
+        ];
+        $config['has_many']['dates'] = [
+            'class_name' => CourseDate::class,
+            'on_delete'  => 'delete',
+            'on_store'   => 'store',
+            'order_by'   => 'ORDER BY date'
+        ];
+
+        $config['has_many']['exdates'] = [
+            'class_name' => CourseExDate::class,
+            'on_delete'  => 'delete',
+            'on_store'   => 'store',
+            'order_by'   => 'ORDER BY date'
+        ];
+
+        $config['additional_fields']['start_hour'] = ['get' => 'getTimeFraction', 'set' => 'setTimeFraction'];
+        $config['additional_fields']['start_minute'] = ['get' => 'getTimeFraction', 'set' => 'setTimeFraction'];
+        $config['additional_fields']['end_hour'] = ['get' => 'getTimeFraction', 'set' => 'setTimeFraction'];
+        $config['additional_fields']['end_minute'] = ['get' => 'getTimeFraction', 'set' => 'setTimeFraction'];
+        $config['additional_fields']['is_visible'] = ['get' => 'getIsVisible'];
+        parent::configure($config);
+    }
+
+    /**
+     * returns array of instances of SeminarCycleDates of the given seminar_id
+     *
+     * @param string seminar_id: selected seminar to search for SeminarCycleDates
+     * @return array of instances of SeminarCycleDates of the given seminar_id or
+     *               an empty array
+     */
+    public static function findBySeminar($seminar_id)
+    {
+        return self::findBySeminar_id($seminar_id, "ORDER BY sorter ASC, weekday ASC, start_time ASC");
+    }
+
+    /**
+     * return instance of SeminarCycleDates of given termin_id
+     *
+     * @param string termin_id: selected seminar to search for SeminarCycleDates
+     * @return array
+     */
+    public static function findByTermin($termin_id)
+    {
+        return self::findOneBySql("metadate_id=(SELECT metadate_id FROM termine WHERE termin_id = ? "
+                                  . "UNION SELECT metadate_id FROM ex_termine WHERE termin_id = ? )", [$termin_id, $termin_id]);
+    }
+    /**
+     * Returns the time fraction for a given field.
+     *
+     * @param String $field Time fraction field
+     * @return int the time fraction
+     */
+    protected function getTimeFraction($field)
+    {
+        if (in_array($field, ['start_hour', 'start_minute'])) {
+            list($start_hour, $start_minute) = explode(':', $this->start_time);
+            return (int)$$field;
+        }
+        if (in_array($field, ['end_hour', 'end_minute'])) {
+            list($end_hour, $end_minute) = explode(':', $this->end_time);
+            return (int)$$field;
+        }
+
+        throw new InvalidArgumentException("Invalid field {$field}");
+    }
+
+    /**
+     * Sets the time fraction for a given field.
+     *
+     * @param String $field Time fraction field
+     * @param mixed  $value Time fraction value as string or int
+     * @return String containing the time fraction
+     */
+    protected function setTimeFraction($field, $value)
+    {
+        if ($field == 'start_hour') {
+            $this->start_time = sprintf('%02u:%02u:00', $value, $this->start_minute);
+            return $this->start_hour;
+        }
+        if ($field == 'start_minute') {
+            $this->start_time = sprintf('%02u:%02u:00', $this->start_hour, $value);
+            return $this->start_minute;
+        }
+        if ($field == 'end_hour') {
+            $this->end_time = sprintf('%02u:%02u:00', $value, $this->end_minute);
+            return $this->end_hour;
+        }
+        if ($field == 'end_minute') {
+            $this->end_time = sprintf('%02u:%02u:00', $this->end_hour, $value);
+            return $this->end_minute;
+        }
+
+        throw new InvalidArgumentException("Invalid field {$field}");
+    }
+
+    /**
+     * Check if there is a least one not cancelled date for this cycle data
+     *
+     * @return bool   true, if there is at least one not cancelled date
+     */
+    public function getIsVisible()
+    {
+        return sizeof($this->dates) ? true : false;
+    }
+
+    /**
+     * SWS needs special setter to always store a decimal
+     *
+     * @param number $value
+     */
+    protected function setSws($value)
+    {
+        $this->content['sws'] = round(str_replace(',', '.', $value), 1);
+    }
+
+    /**
+     * returns a string for a date like '3. 9:00s - 10:45' (short and long)
+     * or '3. 9:00s - 10:45, , ab der 7. Semesterwoche, (Vorlesung)' with the week of the semester
+     * @param format string: "short"|"long"|"full"
+     * @return formatted string
+     */
+    public function toString($format = 'short')
+    {
+        $template['short'] = '%s. %02s:%02s - %02s:%02s';
+        $template['long'] = '%s: %02s:%02s - %02s:%02s, %s';
+        $template['full'] = '%s: %02s:%02s - %02s:%02s, ' . _('%s, ab der %s. Semesterwoche');
+        if ($this->end_offset) {
+            $template['full'] .= ' bis zur %s. Semesterwoche';
+        } else {
+            $template['full'] .= '%s';
+        }
+        $template['full'] .= '%s';
+        $cycles = [_('wöchentlich'), _('zweiwöchentlich'), _('dreiwöchentlich')];
+        $day = getWeekDay($this->weekday, $format == 'short');
+        $result = sprintf($template[$format],
+            $day,
+            $this->start_hour,
+            $this->start_minute,
+            $this->end_hour,
+            $this->end_minute,
+            $cycles[(int)$this->cycle],
+            $this->week_offset + 1,
+            $this->end_offset ? $this->end_offset: '',
+            $this->description ? ' (' . $this->description . ')' : '');
+        return $result;
+    }
+
+    /**
+     * returns an sorted array with all dates and exdates for the cycledate entry
+     * @return array of instances of dates or exdates
+     */
+    public function getAllDates()
+    {
+        $dates = [];
+        foreach ($this->exdates as $date) {
+            $dates[] = $date;
+        }
+        foreach ($this->dates as $date) {
+            $dates[] = $date;
+        }
+
+        usort($dates, function ($a, $b) {
+            return $a->date - $b->date;
+        });
+
+        return $dates;
+    }
+
+    /**
+     * Deletes the cycle.
+     *
+     * @return int number of affected rows
+     */
+    public function delete()
+    {
+        $cycle_info = $this->toString();
+        $seminar_id = $this->seminar_id;
+        $metadate_id = $this->metadate_id;
+        $result = parent::delete();
+
+        if ($result) {
+            $stmt = DBManager::get()->prepare('DELETE FROM schedule_seminare WHERE metadate_id = :metadate_id');
+            $stmt->execute(['metadate_id' => $metadate_id]);
+
+            StudipLog::log('SEM_DELETE_CYCLE', $seminar_id, null, $cycle_info);
+        }
+
+        return $result;
+    }
+
+    /**
+     * Set date-type for all dates
+     * @param $type
+     * @return int
+     */
+    public function setSingleDateType($type)
+    {
+        $result = 0;
+        if (count($this->dates)) {
+            foreach($this->dates as $date) {
+                $date->date_typ = $type;
+                $result += $date->store();
+            }
+        }
+        return $result;
+    }
+
+    /**
+     * Stores this cycle.
+     * @return int number of changed rows
+     */
+    public function store()
+    {
+        //create new entry in seminare_cycle_date
+        if ($this->isNew()) {
+            $result = parent::store();
+            if ($result) {
+                $course = Course::find($this->seminar_id);
+                //create start timestamp
+                $new_dates = $this->createTerminSlots($this->calculateTimestamp(
+                    $course->start_semester->vorles_beginn,
+                    $this->week_offset*7
+                ));
+
+                if (!empty($new_dates)) {
+                    foreach ($new_dates as $semester_dates) {
+                        foreach ($semester_dates['dates'] as $date) {
+                            $result += $date->store();
+                        }
+                    }
+                } else {
+                    $this->delete();
+                    return 0;
+                }
+                $this->resetRelation("dates");
+                StudipLog::log('SEM_ADD_CYCLE', $this->seminar_id, NULL, $this->toString());
+                return $result;
+            }
+            return 0;
+        }
+
+        //change existing cycledate, changes also corresponding single dates
+        $old_cycle = SeminarCycleDate::find($this->metadate_id);
+        if (!parent::store()) {
+            return false;
+        }
+
+        if ($this->start_time != $old_cycle->start_time
+                || $this->end_time != $old_cycle->end_time
+                || $old_cycle->weekday != $this->weekday )
+        {
+            $update_count = $this->updateExistingDates($old_cycle);
+        }
+
+        if ($old_cycle->week_offset != $this->week_offset
+            || $old_cycle->end_offset != $this->end_offset
+            || $old_cycle->cycle != $this->cycle )
+        {
+            $update_count = $this->generateNewDates();
+        }
+
+        StudipLog::log('SEM_CHANGE_CYCLE', $this->seminar_id, NULL,
+                $old_cycle->toString() .' -> ' . $this->toString());
+
+        return $update_count;
+    }
+
+    private function updateExistingDates($old_cycle)
+    {
+        $update_count = 0;
+        foreach ($this->getAllDates() as $date) {
+            // ignore dates in the past
+            if ($date->date < time()) {
+                continue;
+            }
+
+            $tos = $date->date;
+            $toe = $date->end_time;
+            $day = $this->weekday - $old_cycle->weekday;
+
+            $date->date = mktime(date('G', strtotime($this->start_time)), date('i', strtotime($this->start_time)), 0, date('m', $tos), date('d', $tos), date('Y', $tos)) + $day * 24 * 60 * 60;
+            $date->end_time = mktime(date('G', strtotime($this->end_time)), date('i', strtotime($this->end_time)), 0, date('m', $toe), date('d', $toe), date('Y', $toe)) + $day * 24 * 60 * 60;
+
+            if ($date instanceof CourseDate && !is_null($date->room_booking)) {
+                //Check if the time range of the date has decreased and did not exceed the
+                //boundaries of the existing room booking. In that case, the room booking is shortened.
+                if ($date->date < $tos || $date->end_time > $toe) {
+                    //The room booking must be deleted.
+                    $date->room_booking->delete();
+                } else {
+                    //The room booking must be shortened.
+                    $date->room_booking->begin = $date->date;
+                    $date->room_booking->end = $date->end_time;
+                    $date->room_booking->store();
+                }
+            }
+
+            if ($old_cycle->weekday != $this->weekday) {
+                $all_holiday = SemesterHoliday::getAll(); // fetch all Holidays
+                $holiday_date = false;
+                foreach ($all_holiday as $val2) {
+                    if (($val2["beginn"] <= $date->date) && ($date->date <= $val2["ende"])) {
+                        $holiday_date = true;
+                        break;
+                    }
+                }
+
+                //check for calculatable holidays
+                if ($date instanceof CourseDate || $date instanceof CourseExDate) {
+                    $holy_type = SemesterHoliday::isHoliday($date->date, false);
+                    if ($holy_type["col"] == 3) {
+                        $holiday_date = true;
+                    }
+                }
+
+                if ($holiday_date && $date instanceof CourseDate) {
+                    $date->cancelDate();
+                } else if (!$holiday_date && $date instanceof CourseExDate) {
+                    $date->unCancelDate();
+                } else if ($date->isDirty()) {
+                    $date->store();
+                    $update_count++;
+                }
+            } else if ($date->isDirty()) {
+                $date->store();
+                $update_count++;
+            }
+        }
+        $this->resetRelation('dates');
+        $this->resetRelation('exdates');
+        return $update_count;
+    }
+
+    /**
+     * Generate any currently missing single dates for this cycle.
+     */
+    public function generateNewDates()
+    {
+        $course = Course::find($this->seminar_id);
+        $topics = [];
+        //collect topics for existing future dates (CourseDate)
+        foreach ($this->getAllDates() as $date) {
+            if ($date->end_time >= time()) {
+                $topics_tmp = CourseTopic::findByTermin_id($date->termin_id);
+                if (!empty($topics_tmp)) {
+                    $topics[] = $topics_tmp;
+                }
+            }
+
+            if (is_null($this->end_offset)) {
+                // check if seminar is endless
+                if ($course->isOpenEnded()) {
+                    $last_sem = Semester::findOneBySQL('1 ORDER BY beginn DESC');
+                    $end_time_offset = $last_sem->vorles_ende;
+                } else {
+                    $end_time_offset = $course->end_semester->vorles_ende;
+                }
+            } else {
+                $end_time_offset = $this->calculateTimestamp($course->start_semester->vorles_beginn,
+                    ($this->end_offset + 1) * 7
+                );
+            }
+
+            if ($date->date < $this->calculateTimestamp($course->start_semester->vorles_beginn, $this->week_offset * 7) ||
+                $date->date > $end_time_offset
+            ) {
+                $date->delete();
+            }
+        }
+        //restore for updated singledate entries
+        $this->resetRelation('dates');
+        $this->resetRelation('exdates');
+
+        //create start timestamp
+        $new_dates = $this->createTerminSlots($this->calculateTimestamp(
+            $course->start_semester->vorles_beginn,
+            $this->week_offset*7
+        ));
+
+        $update_count = 0;
+
+        foreach ($new_dates as $semester_dates) {
+            //update or create singeldate entries
+            foreach ($semester_dates['dates'] as $date) {
+                if ($date instanceof CourseDate && $date->date >= time() && count($topics) > 0) {
+                    $date->topics = array_shift($topics);
+                }
+                if ($date->store()) {
+                    $update_count++;
+                }
+            }
+
+            //delete unnecessary singeldate entries
+            foreach ($semester_dates['dates_to_delete'] as $date) {
+                $date->delete();
+            }
+        }
+        return $update_count;
+    }
+
+    /**
+     * generate single date objects for one cycle and all semester, existing dates are merged in
+     *
+     * @param startAfterTimeStamp => int timestamp to override semester start
+     * @return array array of arrays, for each semester id  an array of two arrays of SingleDate objects: 'dates' => all new and surviving dates, 'dates_to_delete' => obsolete dates
+     */
+    private function createTerminSlots($startAfterTimeStamp = 0)
+    {
+        $course = Course::find($this->seminar_id);
+        $ret = [];
+
+        if ($startAfterTimeStamp == 0 || $startAfterTimeStamp < $course->start_semester->vorles_beginn) {
+            $startAfterTimeStamp = $course->start_semester->vorles_beginn;
+        }
+
+        // check if cycle has a fix end (end_offset == null -> endless)
+        if (is_null($this->end_offset)) {
+            // check if seminar is endless
+            if ($course->isOpenEnded()) {
+                $last_sem = Semester::findOneBySQL('1 ORDER BY beginn DESC');
+                $sem_end = $last_sem->vorles_ende;
+            } else {
+                $sem_end = $course->end_semester->vorles_ende;
+            }
+        } else {
+            $sem_end = $this->calculateTimestamp($course->start_semester->vorles_beginn, ($this->end_offset + 1) * 7);
+        }
+
+        $semester = Semester::findBySQL('beginn <= :ende AND ende >= :start',
+                ['start' => $startAfterTimeStamp, 'ende' => $sem_end]);
+
+        foreach ($semester as $val) {
+                $ret[$val['semester_id']] = $this->createSemesterTerminSlots($val['vorles_beginn'], $val['vorles_ende'], $startAfterTimeStamp);
+        }
+        return $ret;
+    }
+
+
+    /**
+     * generate single date objects for one cycle and one semester, existing dates are merged in
+     *
+     * @param string cycle id
+     * @param int    timestamp of semester start
+     * @param int    timestamp of semester end
+     * @param int    alternative timestamp to start from
+     * @return array returns an array of two arrays of SingleDate objects: 'dates' => all new and surviving dates, 'dates_to_delete' => obsolete dates
+     */
+    private function createSemesterTerminSlots($sem_begin, $sem_end, $startAfterTimeStamp)
+    {
+
+        $dates = [];
+        $dates_to_delete = [];
+
+        // The currently existing singledates for the by metadate_id denoted  regular time-entry
+        //$existingSingleDates =& $this->cycles[$metadate_id]->getSingleDates();
+        $all_dates = $this->getAllDates();
+        $existingSingleDates =& $all_dates;
+
+        $start_woche = $this->week_offset;
+        $turnus_offset = 0;
+
+        // This variable is used to check if a given singledate shall be created in a bi-weekly seminar.
+        if ($start_woche == -1) {
+            $start_woche = 0;
+        }
+        $week = 0;
+
+        // get the first presence date after sem_begin
+        $day_of_week = date('l', strtotime('Sunday + ' . $this->weekday . ' days'));
+        $stamp = strtotime('this week ' . $day_of_week, max($sem_begin, $startAfterTimeStamp));
+
+        $start = explode(':', $this->start_time);
+
+        $start_time = mktime(
+            (int)$start[0],                                     // Hour
+            (int)$start[1],                                     // Minute
+            0,                                                  // Second
+            date("n", $stamp),                                  // Month
+            date("j", $stamp),                                  // Day
+            date("Y", $stamp));                                 // Year
+
+        $end = explode(':', $this->end_time);
+        $end_time = mktime(
+            (int)$end[0],                                       // Hour
+            (int)$end[1],                                       // Minute
+            0,                                                  // Second
+            date("n", $stamp),                                  // Month
+            date("j", $stamp),                                  // Day
+            date("Y", $stamp));                                 // Year
+
+        $course = Course::find($this->seminar_id);
+
+        // check if cycle has a fix end (end_offset == null -> endless)
+        if (is_null($this->end_offset)) {
+            // check if seminar is endless
+            if ($course->isOpenEnded()) {
+                $last_sem = Semester::findOneBySQL('1 ORDER BY beginn DESC');
+                $end_time_offset = $last_sem->vorles_ende;
+            } else {
+                $end_time_offset = $course->end_semester->vorles_ende;
+            }
+        } else {
+            $end_time_offset = $this->calculateTimestamp($course->start_semester->vorles_beginn, ($this->end_offset + 1) * 7);
+        }
+
+        // loop through all possible singledates for this regular time-entry
+        do {
+
+            // if dateExists is true, the singledate will not be created. Default is of course to create the singledate
+            $dateExists = false;
+
+            // do not create singledates if they are earlier than the semester start
+            if ($end_time < $sem_begin) {
+                $dateExists = true;
+                $turnus_offset = 1;
+            }
+
+            /*
+             * We only create dates, which do not already exist, so we do not overwrite existing dates.
+             *
+             * Additionally, we delete singledates which are not needed any more (bi-weekly, changed start-week, etc.)
+             */
+            $date_values['range_id'] = $this->seminar_id;
+            $date_values['autor_id'] = $GLOBALS['user']->id;
+            $date_values['metadate_id'] = $this->metadate_id;
+            foreach ($existingSingleDates as $key => $val) {
+                // take only the singledate into account, that maps the current timepoint
+                // only compare the week and year, because dates in the past may differ on time or day
+                if ($start_time > $startAfterTimeStamp && date('W Y', $val->date) == date('W Y', $start_time)) {
+                    $dateExists = true;
+                    if (isset($existingSingleDates[$key])) {
+                        $dates[] = $val;
+                    }
+                }
+            }
+
+            if (!$dateExists) {
+                $termin = new CourseDate();
+
+                $all_holiday = SemesterHoliday::getAll(); // fetch all Holidays
+                foreach ($all_holiday as $val2) {
+                    if (($val2["beginn"] <= $start_time) && ($start_time <= $val2["ende"])) {
+                        $termin = new CourseExDate();
+                        break;
+                    }
+                }
+
+                //check for calculatable holidays
+                if ($termin instanceof CourseDate) {
+                    $holy_type = SemesterHoliday::isHoliday($start_time, false);
+                    if (!is_bool($holy_type) && $holy_type['col'] == 3) {
+                        $termin = new CourseExDate();
+                    }
+                }
+                $date_values['date'] = $start_time;
+                $date_values['end_time'] = $end_time;
+                $date_values['date_type'] = 1;
+                $termin->setData($date_values);
+
+                $dates[] = $termin;
+            }
+
+            //inc the week, create timestamps for the next singledate
+            $start_time = strtotime('+ 1 week', $start_time);
+            $end_time = strtotime('+ 1 week', $end_time);
+            $week++;
+
+        } while ($end_time < $sem_end && $end_time < $end_time_offset);
+
+        //calulate trurnus
+        if ($this->cycle != 0) {
+            return $this->calculateTurnusDates($dates, $turnus_offset);
+        }
+        return ['dates' => $dates, 'dates_to_delete' => $dates_to_delete];
+    }
+
+
+    /**
+     * Calculate turnus for singledate entries
+     *
+     * @param array $dates
+     * @param int $turnus_offset correction for turnus calculation if first date is not within semester
+     * @return array
+     */
+    public function calculateTurnusDates($dates, $turnus_offset)
+    {
+        $week_count = 0 + $turnus_offset;
+        $dates_to_store = [];
+        $dates_to_delete = [];
+        foreach ($dates as $date) {
+
+            if ($this->cycle == 1 && $week_count % 2 != 0 && $week_count > 0) {
+                if (!$date->isNew()) {
+                    $dates_to_delete[] = $date;
+                }
+            } else if ($this->cycle == 2 && $week_count % 3 != 0 && $week_count > 0) {
+                if (!$date->isNew()) {
+                    $dates_to_delete[] = $date;
+                }
+            } else {
+                $dates_to_store[] = $date;
+            }
+            $week_count++;
+        }
+        return ['dates' => $dates_to_store, 'dates_to_delete' => $dates_to_delete];
+    }
+
+    /**
+     * removes all singleDates which are NOT between $start and $end
+     *
+     * @param int    timestamp for start
+     * @param int    timestamp for end
+     * @param string seminar_id
+     */
+    public static function removeOutRangedSingleDates($start, $end, $seminar_id)
+    {
+        $query = "SELECT termin_id
+                  FROM termine
+                  WHERE range_id = ? AND (`date` NOT BETWEEN ? AND ?)
+                    AND NOT (metadate_id IS NULL OR metadate_id = '')";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$seminar_id, $start, $end]);
+        $ids = $statement->fetchAll(PDO::FETCH_COLUMN);
+
+        foreach ($ids as $id) {
+            $termin = new SingleDate($id);
+            $termin->delete();
+            unset($termin);
+        }
+
+        if (count($ids) > 0) {
+            // remove all assigns for the dates in question
+            $query = "SELECT id FROM resource_bookings WHERE range_id IN (?)";
+            $statement = DBManager::get()->prepare($query);
+            $statement->execute([$ids]);
+
+            $booking_ids = $statement->fetchAll(PDO::FETCH_COLUMN | PDO::FETCH_UNIQUE, 0);
+
+            ResourceBooking::deleteBySql(
+                'id IN ( :booking_ids )',
+                [
+                    'booking_ids' => $booking_ids
+                ]
+            );
+        }
+
+        $query = "DELETE FROM ex_termine
+                  WHERE range_id = ? AND (`date` NOT BETWEEN ? AND ?)
+                    AND NOT (metadate_id IS NULL OR metadate_id = '')";
+        $statement = DBManager::get()->prepare($query);
+        $statement->execute([$seminar_id, $start, $end]);
+    }
+
+    /**
+     * returns a new timestamp for an given start-timestamp and
+     * an amount of days calculated with DateTime-Class
+     *
+     * @param  int  starttime as timestamp
+     * @param  int  amount of days
+     * @return int  new timestamp
+     */
+    private static function calculateTimestamp($base, $days = 0)
+    {
+        $date = new DateTime();
+        $date->setTimestamp($base);
+        $date->modify(sprintf('this week monday +%s days', $days));
+        return $date->getTimestamp();
+    }
+
+
+    /**
+     * This is a helper method for getRoomRequestsForDates and
+     * countRoomRequestsForDates which helps at building the
+     * SQL query and parameters.
+     *
+     * @returns array An associative array with two indexes:
+     *     - sql: The SQL query
+     *     - sql_params: The parameters for the SQL query as associative array.
+     */
+    protected function buildOpenRequestsForDatesQuery(
+        $include_metadate = false,
+        $order = ''
+    )
+    {
+        $sql = "closed < '1' AND ";
+        $sql_params = [];
+
+        if ($include_metadate) {
+            $sql = 'metadate_id = :metadate_id OR ';
+        }
+
+        $sql .= 'termin_id IN (
+            SELECT termin_id FROM termine
+            WHERE metadate_id = :metadate_id
+        ) OR id IN (
+            SELECT request_id
+            FROM resource_request_appointments rra
+            INNER JOIN termine
+            ON rra.appointment_id = termine.termin_id
+            WHERE termine.metadate_id = :metadate_id
+        ) ';
+        $sql_params['metadate_id'] = $this->id;
+
+        if ($order) {
+            $sql .= 'ORDER BY ' . $order;
+        }
+        return [
+            'sql' => $sql,
+            'sql_params' => $sql_params
+        ];
+    }
+
+
+    /**
+     * Returns the open room requests that are associated with this metadate.
+     * If the optional parameter $include_metadate is set to false,
+     * the requests associated with this metadate are not included
+     * in the result.
+     *
+     * @param bool $include_metadate Whether to include requests associated
+     *     with this metadate (true) or not (false). The default is false.
+     *
+     * @returns ResourceRequest[] The requests for this metadate.
+     */
+    public function getOpenRequestsForDates(
+        $include_metadate = false,
+        $order = 'mkdate DESC'
+    )
+    {
+        $data = $this->buildOpenRequestsForDatesQuery($include_metadate, $order);
+        return ResourceRequest::findBySql($data['sql'], $data['sql_params']);
+    }
+
+
+    /**
+     * Returns the amount of open room requests that are associated
+     * with this metadate.
+     * The amount of requests is determined by counting requests that are
+     * directly associated to this metadate and the requests that are
+     * associated with the dates of this metadate.
+     * If the optional parameter $include_metadate is set to false,
+     * the requests associated with this metadate are not included
+     * in the result.
+     *
+     * @param bool $include_metadate Whether to include requests associated
+     *     with this metadate (true) or not (false). The default is false.
+     *
+     * @returns int The amount of requests for this metadate.
+     */
+    public function countOpenRequestsForDates($include_metadate = false)
+    {
+        $data = $this->buildOpenRequestsForDatesQuery($include_metadate);
+        return ResourceRequest::countBySql($data['sql'], $data['sql_params']);
+    }
+}