fix(agent): handle bot reconnection and return 400 on duplicate registration

backend/app/api/routes.py

@@ -84,15 +84,21 @@ async def reset_board():
     tags=["Players"],
 )
 async def register_player(player_in: PlayerCreate):
-    player = await game_engine.register_player(player_in)
-    board_state = await game_engine.get_board_state()
-    await manager.broadcast({
-        "event": "player_registered",
-        "player": player.model_dump(),
-        "total_players": len(board_state.players),
-        "turn": board_state.turn.model_dump(),
-    })
-    return player
+    try:
+        player = await game_engine.register_player(player_in)
+        board_state = await game_engine.get_board_state()
+        await manager.broadcast({
+            "event": "player_registered",
+            "player": player.model_dump(),
+            "total_players": len(board_state.players),
+            "turn": board_state.turn.model_dump(),
+        })
+        return player
+    except ValueError as e:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e),
+        )
 
 
 @router.get(

botagent/bot_agent.py

@@ -23,11 +23,29 @@ class SmartBotAgent:
         self.is_leader: bool = False
 
     def register(self):
-        """Register the bot avatar on the 64x64 grid."""
+        """Register the bot avatar on the 64x64 grid or reconnect if already present."""
+        try:
+            players = requests.get(f"{BASE_URL}/players").json()
+            for p in players:
+                if p.get("name") == self.name:
+                    self.bot_id = p["id"]
+                    print(f"🔄 [RECONNECT] Reconnected to existing {self.name} (ID: {self.bot_id}, Str: {p.get('strength', self.strength)}) at ({p.get('x')}, {p.get('y')})")
+                    return
+        except Exception:
+            pass
+
         res = requests.post(
             f"{BASE_URL}/players",
             json={"name": self.name, "color": self.color, "strength": self.strength},
         )
+        if res.status_code == 400 and "already registered" in res.text:
+            players = requests.get(f"{BASE_URL}/players").json()
+            for p in players:
+                if p.get("name") == self.name:
+                    self.bot_id = p["id"]
+                    print(f"🔄 [RECONNECT] Reconnected to existing {self.name} (ID: {self.bot_id}) at ({p.get('x')}, {p.get('y')})")
+                    return
+
         res.raise_for_status()
         data = res.json()
         self.bot_id = data["id"]
@@ -231,7 +249,7 @@ class SmartBotAgent:
             while True:
                 turn_info = requests.get(f"{BASE_URL}/turn").json()
                 if not turn_info.get("game_started", False):
-                    print("⏳ [LOBBY] Waiting for game to start via 'Start Game' in UI...", end="\r")
+                    print("⏳ [LOBBY] Waiting for game to start via 'Start Game' in UI...", end="\r", flush=True)
                     time.sleep(0.5)
                     continue