Shifts filter: Only show rooms with shifts

includes/pages/user_shifts.php

@@ -4,6 +4,8 @@ use Engelsystem\Database\Db;
 use Engelsystem\Helpers\Carbon;
 use Engelsystem\Models\AngelType;
 use Engelsystem\Models\Room;
+use Engelsystem\Models\Shifts\NeededAngelType;
+use Engelsystem\Models\Shifts\Shift;
 use Engelsystem\Models\UserAngelType;
 use Engelsystem\ShiftsFilter;
 use Illuminate\Database\Eloquent\Builder;
@@ -113,9 +115,26 @@ function update_ShiftsFilter(ShiftsFilter $shiftsFilter, $user_shifts_admin, $da
 /**
  * @return Room[]|Collection
  */
-function load_rooms()
+function load_rooms(bool $onlyWithActiveShifts = false)
 {
-    $rooms = Room::orderBy('name')->get();
+    $rooms = Room::orderBy('name');
+
+    if ($onlyWithActiveShifts) {
+        $roomIdsFromAngelType = NeededAngelType::query()
+            ->whereNotNull('room_id')
+            ->select('room_id');
+
+        $roomIdsFromShift = Shift::query()
+            ->leftJoin('needed_angel_types', 'shifts.id', 'needed_angel_types.shift_id')
+            ->whereNotNull('needed_angel_types.shift_id')
+            ->select('shifts.room_id');
+
+        $rooms->whereIn('id', $roomIdsFromAngelType)
+            ->orWhereIn('id', $roomIdsFromShift);
+    }
+
+    $rooms = $rooms->get();
+
     if ($rooms->isEmpty()) {
         error(__('The administration has not configured any rooms yet.'));
         throw_redirect(page_link_to('/'));
@@ -210,7 +229,7 @@ function view_user_shifts()
 
     $session = session();
     $days = load_days();
-    $rooms = load_rooms();
+    $rooms = load_rooms(true);
     $types = load_types();
     $ownAngelTypes = [];