fix: NCWF-4 Token Issues (#8)

Co-authored-by: Lala, Shahd <Shahd.Lala@sybit.de>
Co-authored-by: shahdlala66 <shahd.lala66@gmail.com>
Reviewed-on: #8

src/app/services/game-completion.service.ts

@@ -24,23 +24,28 @@ export class GameCompletionService {
     return { isFinished: true, message };
   }
 
+  isTimeOut(state: GameState | null): boolean {
+    if (!state?.clock) return false;
+    return state.clock.whiteRemainingMs <= 0 || state.clock.blackRemainingMs <= 0;
+  }
+
   private buildCompletionMessage(status: GameStatus, state: GameState, game: GameFull): string {
+    const winner = state.winner === 'white' ? game.white.displayName : state.winner === 'black' ? game.black.displayName : null;
+    const loser  = state.winner === 'white' ? game.black.displayName : state.winner === 'black' ? game.white.displayName : null;
+
     switch (status) {
       case 'checkmate':
-        const winner = state.winner === 'white' ? game.white.displayName : game.black.displayName;
-        return `Checkmate! ${winner} wins!`;
+        return winner ? `Checkmate — ${winner} wins!` : 'Checkmate!';
       case 'stalemate':
-        return 'Stalemate! The game is a draw.';
+        return 'Stalemate — draw!';
       case 'resign':
-        const resignedPlayer = state.winner === 'white' ? game.black.displayName : game.white.displayName;
-        const resignedWinner = state.winner === 'white' ? game.white.displayName : game.black.displayName;
-        return `${resignedPlayer} resigned. ${resignedWinner} wins!`;
+        return loser && winner ? `${loser} resigned — ${winner} wins!` : 'Resigned.';
       case 'draw':
-        return 'Draw! The game ended in a draw.';
+        return 'Draw by agreement.';
       case 'insufficientMaterial':
-        return 'Insufficient material! The game is a draw.';
+        return 'Draw — insufficient material.';
       default:
-        return 'Game ended!';
+        return 'Game over.';
     }
   }
 }