check whether a room is in an active course

src/modules/courses/ui/views/course-list-view.tsx

@@ -4,7 +4,7 @@ import { getMyCourses, deleteCourse } from "../../actions/course-actions";
 import { getAllRooms } from "@/src/modules/rooms/actions/room-actions";
 import { Button } from "@/src/components/ui/button";
 import { toast } from "sonner";
-import { useRouter } from "next/navigation";
+import { useRouter, useSearchParams } from "next/navigation";
 import CourseListItem from "../components/CourseListItem";
 import { Filter, ChevronUp, ChevronDown } from "lucide-react";
 import DeleteDialog from "@/src/components/layout/DeleteDialog";
@@ -36,12 +36,13 @@ type Course = {
 
 const CourseListView = () => {
   const router = useRouter();
+  const searchParams = useSearchParams();
   const [courses, setCourses] = useState<Course[]>([]);
   const [isLoading, setIsLoading] = useState(true);
   const [filterStatus, setFilterStatus] = useState<"all" | "draft" | "published">("all");
   const [filterSport, setFilterSport] = useState<string>("all");
   const [filterTrainer, setFilterTrainer] = useState<string>("all");
-  const [filterRoom, setFilterRoom] = useState<string>("all");
+  const [filterRoom, setFilterRoom] = useState<string>(searchParams.get("room") ?? "all");
   const [dateFrom, setDateFrom] = useState("");
   const [dateTo, setDateTo] = useState("");
   const [timeFrom, setTimeFrom] = useState("");

src/modules/rooms/actions/room-actions.ts

@@ -352,7 +352,30 @@ export async function deleteRoom(roomId: string) {
       };
     }
 
-    // Schritt 6: Raum aus der Datenbank löschen
+    // Schritt 6: Prüfen, ob der Raum noch in zukünftigen Kursen verwendet wird
+    const today = new Date();
+    today.setHours(0, 0, 0, 0);
+
+    const futureCourses = await prisma.course.findMany({
+      where: {
+        room: roomId,
+        date: { gte: today },
+        createdBy: userData.id,
+      },
+      select: { id: true, name: true },
+    });
+
+    if (futureCourses.length > 0) {
+      const courseNames = futureCourses.map((c) => c.name).join(", ");
+      return {
+        success: false,
+        error: `Raum kann nicht gelöscht werden, da er noch in ${futureCourses.length} zukünftigen Kursen verwendet wird: ${courseNames}`,
+        hasActiveCourses: true,
+        roomName: room.name,
+      };
+    }
+
+    // Schritt 7: Raum aus der Datenbank löschen
     await prisma.room.delete({
       where: { id: roomId },
     });

src/modules/rooms/ui/views/rooms-list-view.tsx

@@ -65,6 +65,24 @@ const RoomsListView = ({ deleteMode }: RoomsListViewProps) => {
       setRooms((prev) => prev.filter((room) => room.id !== roomToDelete.id));
       setDeleteDialogOpen(false);
       setRoomToDelete(null);
+    } else if (result.hasActiveCourses) {
+      setDeleteDialogOpen(false);
+      setRoomToDelete(null);
+      toast.error(result.error, {
+        duration: 8000,
+        style: { maxWidth: "680px" },
+        action: {
+          label: "Kurse anzeigen",
+          onClick: () => router.push(`/courses?room=${result.roomName}`),
+        },
+        actionButtonStyle: {
+          backgroundColor: "#F4C00C",
+          color: "#1E293B",
+          fontWeight: "600",
+          padding: "8px 14px",
+          borderRadius: "6px",
+        },
+      });
     } else {
       toast.error(result.error || "Fehler beim Löschen des Raumes");
     }