fix for BIESt 1813, closes #1813

Closes #1813

Merge request !1365

app/controllers/course/timesrooms.php

@@ -680,30 +680,65 @@ class Course_TimesroomsController extends AuthenticatedController
          */
         $this->date = CourseDate::findOneByMetadate_id($cycle_id);
         $this->checked_dates = $_SESSION['_checked_dates'];
-        $this->preparation_time = '0';
-        //Check if the preparation time is the same for all dates.
-        //In that case, use the common value as preparation time.
-        $i = 0;
-        $ptime = 0;
-        foreach ($checked_course_dates as $course_date) {
-            $current_ptime = $course_date->room_booking->preparation_time;
-            if ($i == 0) {
-                $ptime = $current_ptime;
-            } else {
-                if ($current_ptime != $ptime) {
-                    $ptime = -1;
-                    break;
-                }
-            }
-            $i++;
-        }
-        if ($ptime > -1) {
-            $this->preparation_time = $ptime / 60;
-        }
+
+        $this->selected_lecturer_ids = $this->getSameFieldValue($checked_course_dates, function (CourseDate $date) {
+            return $date->dozenten->pluck('user_id');
+        });
+        $this->selected_room_id = $this->getSameFieldValue($checked_course_dates, function (CourseDate $date) {
+            return $date->room_booking->resource_id ?? '';
+        });
+        $this->selected_room_name = $this->getSameFieldValue($checked_course_dates, function (CourseDate $date) {
+            return $date->raum ?? '';
+        });
+
+        $preparation_time = $this->getSameFieldValue($checked_course_dates, function (CourseDate $date) {
+            return $date->room_booking->preparation_time ?? 0;
+        });
+        $this->preparation_time = floor($preparation_time / 60);
+
         $this->max_preparation_time = Config::get()->RESOURCES_MAX_PREPARATION_TIME;
         $this->render_template('course/timesrooms/editStack');
     }
 
+    /**
+     * Checks a specific field value of the specified course dates for equality.
+     * A closure defines which field of the course dates to check.
+     *
+     * @param CourseDate[] $dates The dates from which to extract values.
+     * @param Closure $callback The closure that extracts values from a CourseDate object that is passed to it.
+     * @return mixed The identical value that has been retrieved from all course dates or a value that is equal to
+     *     false in case the value differs. The returned result might be a string or an array or it may be empty.
+     */
+    protected function getSameFieldValue(array $dates, Closure $callback)
+    {
+        $data = array_map($callback, $dates);
+
+        $initial = null;
+        foreach ($data as $item) {
+            if ($initial === null) {
+                $initial = $item;
+                continue;
+            }
+
+            // Compare array by checking their sizes and different items
+            if (
+                is_array($initial)
+                && (
+                    count($initial) !== count($item)
+                    || count(array_diff($initial, $item)) > 0
+                )
+            ) {
+                return [];
+            }
+
+            // Otherwise compare items themselves
+            if (!is_array($initial) && $initial != $item) {
+                return '';
+            }
+        }
+
+        return $initial;
+    }
 
     /**
      * Creates a new room request for the selected dates.

app/views/course/timesrooms/editStack.php

@@ -5,13 +5,13 @@
  * @var array $linkAttributes
  * @var array $checked_dates
  * @var array $selectable_rooms
- * @var array $tpl
  * @var QuickSearch $room_search
  * @var array $only_bookable_rooms
  * @var array $teachers
  * @var array $gruppen
  * @var int $preparation_time
  * @var int $max_preparation_time
+ * @var string[] $selected_lecturer_ids
  */
 ?>
 <form method="post" action="<?= $controller->url_for('course/timesrooms/saveStack/' . $cycle_id, $linkAttributes) ?>"
@@ -46,7 +46,8 @@
                                 <select name="room_id" onFocus="jQuery('input[type=radio][name=action][value=room]').prop('checked', 'checked')">
                                     <option value="0"><?= _('Auswählen') ?></option>
                                     <? foreach ($selectable_rooms as $room): ?>
-                                        <option value="<?= htmlReady($room->id)?>">
+                                        <option value="<?= htmlReady($room->id)?>"
+                                            <?= $room->id === $selected_room_id ? 'selected' : '' ?>>
                                             <?= htmlReady($room->name) ?>
                                         </option>
                                     <? endforeach ?>
@@ -75,7 +76,7 @@
                 <?= $placerholder ?>
             </label>
             <label>
-                <input type="text" name="freeRoomText" value="<?= htmlReady($tpl['freeRoomText']) ?>"
+                <input type="text" name="freeRoomText" value="<?= htmlReady($selected_room_name) ?>"
                        placeholder="<?= $placerholder ?>"
                        onFocus="jQuery('input[type=radio][name=action][value=freetext]').prop('checked', 'checked')">
             </label>
@@ -108,6 +109,15 @@
 
     <fieldset class="collapsed">
         <legend><?= _('Durchführende Lehrende') ?></legend>
+        <? if ($selected_lecturer_ids) : ?>
+            <ul>
+                <? foreach ($teachers as $teacher) : ?>
+                    <? if (in_array($teacher['user_id'], $selected_lecturer_ids)) : ?>
+                        <li><?= htmlReady($teacher['fullname']) ?></li>
+                    <? endif ?>
+                <? endforeach ?>
+            </ul>
+        <? endif ?>
         <label>
             <?= _('Aktion auswählen') ?>
             <select name="related_persons_action" id="related_persons_action">
@@ -121,11 +131,11 @@
             <label>
                 <?= _('Lehrende') ?>
                 <select name="related_persons[]" id="related_persons" multiple>
-                    <? foreach ($teachers as $teacher) : ?>
-                        <option value="<?= htmlReady($teacher['user_id']) ?>">
-                            <?= htmlReady($teacher['fullname']) ?>
-                        </option>
-                    <? endforeach ?>
+                <? foreach ($teachers as $teacher) : ?>
+                    <option value="<?= htmlReady($teacher['user_id']) ?>">
+                        <?= htmlReady($teacher['fullname']) ?>
+                    </option>
+                <? endforeach ?>
                 </select>
             </label>
         <? endif ?>