Added quiz new features

app/Http/Controllers/api/PvPQuizController.php

@@ -81,6 +81,16 @@ class PvPQuizController extends Controller
             'time_taken_seconds' => 'required|numeric|min:0.1|max:15', // Max 15 seconds to answer
         ]);
 
+        // Prevent answering the same question twice!
+        $alreadyAnswered = $match->answers()
+            ->where('user_id', auth()->id())
+            ->where('question_id', $request->question_id)
+            ->exists();
+
+        if ($alreadyAnswered) {
+            return $this->failed(null, 'خطا', 'شما قبلا به این سوال پاسخ داده‌اید.');
+        }
+
         $player = $match->players()->where('user_id', auth()->id())->firstOrFail();
         $question = Question::with('options')->find($request->question_id);
 
@@ -144,30 +154,43 @@ class PvPQuizController extends Controller
      */
     private function finalizeMatch(PvpMatch $match)
     {
-        // Get both players, ordered by the highest score first
         $players = $match->players()->orderByDesc('score')->get();
-
-        $player1 = $players->first(); // The one with the higher score
-        $player2 = $players->last();  // The one with the lower score
+        $player1 = $players->first();
+        $player2 = $players->last();
 
         $winnerId = null;
-
-        // Check if it's a draw, or if someone actually won
         if ($player1->score > $player2->score) {
             $winnerId = $player1->user_id;
         }
-        // If scores are exactly equal, winnerId stays null (Draw/Tie)
 
-        // Close the room
         $match->update([
             'status' => 'completed',
             'ended_at' => now(),
             'winner_id' => $winnerId
         ]);
 
-        // TODO (Next Step): Fire a WebSocket Event here to push the "Game Over" screen!
+        // --- NEW: UPDATE GAMIFICATION STATS ---
+        $user1 = \App\Models\User::find($player1->user_id);
+        $user2 = \App\Models\User::find($player2->user_id);
+
+        $user1->increment('duels_played');
+        $user2->increment('duels_played');
+
+        // Give XP and Wins
+        if ($winnerId) {
+            $winner = \App\Models\User::find($winnerId);
+            $winner->increment('duels_won');
+            $winner->increment('xp', 50); // Winner gets 50 XP
+
+            // NOTE: Here we will later trigger the "duel_win" Daily Quest progress!
         }
 
+        // Loser/Draw gets participation XP
+        $loserId = $winnerId === $user1->id ? $user2->id : $user1->id;
+        \App\Models\User::find($loserId)->increment('xp', 10);
+
+        // TODO: Fire a WebSocket Event to push "Game Over" screen!
+    }
     /**
      * STEP 4: Get Final Match Results
      */