fix promo max_uses

app/api/promo.py

@@ -42,35 +42,72 @@ async def admin_create_promo(
     clientToken: str = Form(...),
     code: str = Form(...),
     reward_coins: int = Form(...),
-    max_uses: int | None = Form(None),
+    max_uses: str | None = Form(
+        default=None,
+        description="Сколько всего раз можно активировать промокод. Пусто = бесконечно. 1 = одноразовый."
+    ),
     is_active: bool = Form(True),
 ):
     await validate_admin(accessToken, clientToken)
+
+    # normalize max_uses
+    if max_uses is None or max_uses.strip() == "":
+        max_uses_int = None
+    else:
+        try:
+            max_uses_int = int(max_uses)
+        except ValueError:
+            raise HTTPException(status_code=400, detail="max_uses must be an integer")
+        if max_uses_int <= 0:
+            # 0 или отрицательные считаем как "бесконечно"
+            max_uses_int = None
+
     payload = PromoCreate(
         code=code,
         reward_coins=reward_coins,
-        max_uses=max_uses,
+        max_uses=max_uses_int,
         is_active=is_active,
     )
     return await promo_service.create(payload)
 
+
 @router.put("/admin/promo/{promo_id}", response_model=dict)
 async def admin_update_promo(
     promo_id: str,
     accessToken: str = Form(...),
     clientToken: str = Form(...),
     reward_coins: int | None = Form(None),
-    max_uses: int | None = Form(None),
+    max_uses: str | None = Form(
+        default=None,
+        description="Пусто = не менять. '0' = бесконечно. '1' = одноразовый."
+    ),
     is_active: bool | None = Form(None),
 ):
     await validate_admin(accessToken, clientToken)
-    payload = PromoUpdate(
-        reward_coins=reward_coins,
-        max_uses=max_uses,
-        is_active=is_active
-    )
+
+    max_uses_int = None
+    max_uses_provided = max_uses is not None  # отличаем “не прислали” от “прислали пусто/0”
+
+    if max_uses_provided:
+        if max_uses.strip() == "":
+            # пусто -> бесконечно
+            max_uses_int = None
+        else:
+            try:
+                max_uses_int = int(max_uses)
+            except ValueError:
+                raise HTTPException(status_code=400, detail="max_uses must be an integer")
+            if max_uses_int <= 0:
+                max_uses_int = None
+
+    data = {"reward_coins": reward_coins, "is_active": is_active}
+    if max_uses_provided:
+        data["max_uses"] = max_uses_int
+
+    payload = PromoUpdate(**{k: v for k, v in data.items() if v is not None or k == "max_uses" and max_uses_provided})
     return await promo_service.update(promo_id, payload)
 
+
 @router.delete("/admin/promo/{promo_id}")
 async def admin_delete_promo(
     promo_id: str,