feat: some fixes to the ui, imlemented user and guest user, ans used the dahboard

app/Http/Controllers/RoomPlayerController.php

@@ -3,23 +3,51 @@
 namespace App\Http\Controllers;
 
 use App\Http\Requests\JoinRoomRequest;
+use App\Models\Player;
 use App\Models\Room;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Validation\ValidationException;
 
 class RoomPlayerController extends Controller
 {
-    public function join(JoinRoomRequest $request)
+    public function join(JoinRoomRequest $request): RedirectResponse
     {
         $validated = $request->validated();
         $user = $request->user();
 
-        $room = Room::where('join_code', '=', $validated['join_code'])->firstOrFail();
+        [$room, $player] = DB::transaction(function () use ($request, $validated, $user): array {
+            $room = Room::query()
+                ->where('join_code', $validated['join_code'])
+                ->lockForUpdate()
+                ->firstOrFail();
 
-        $player = $room->players()->create([
-            'user_id' => $user?->id,
-            'name' => $validated['player_name'],
-            'is_moderator' => false,
-            'last_seen_at' => now(),
-        ]);
+            if ($room->isClosed()) {
+                throw ValidationException::withMessages([
+                    'join_code' => 'Dieser Raum ist geschlossen.',
+                ]);
+            }
+
+            $player = $this->existingPlayer($request, $room);
+
+            if ($player === null) {
+                $player = $room->players()->create([
+                    'user_id' => $user?->id,
+                    'name' => $validated['player_name'],
+                    'is_moderator' => false,
+                    'last_seen_at' => now(),
+                ]);
+            } else {
+                $player->update(['last_seen_at' => now()]);
+            }
+
+            $room->update([
+                'last_activity_at' => now(),
+                'state_version' => $room->state_version + 1,
+            ]);
+
+            return [$room, $player];
+        });
 
         $request->session()->put(
             "room_players.{$room->id}",
@@ -27,6 +55,20 @@ class RoomPlayerController extends Controller
         );
 
         return to_route('room.show', $room);
+    }
 
+    private function existingPlayer(JoinRoomRequest $request, Room $room): ?Player
+    {
+        if ($request->user() !== null) {
+            return $room->players()
+                ->where('user_id', $request->user()->id)
+                ->first();
+        }
+
+        $playerId = $request->session()->get("room_players.{$room->id}");
+
+        return is_numeric($playerId)
+            ? $room->players()->find((int) $playerId)
+            : null;
     }
 }