add rounding method for Toman price in ProductVariant model

backend/product/models.py

@@ -446,6 +446,10 @@ class ProductVariant(DirtyFieldsMixin, models.Model):
         except Exception:
             return 0
 
+    def round_toman(self, value):
+        """Round to nearest 1000 toman (e.g., 89123 -> 89000, 89500 -> 90000)"""
+        return round(value / 1000) * 1000
+
     def set_or_update_price(self, dollor_price=None):
         if not dollor_price:
             dollor_object, _ = DollorModel.objects.get_or_create(
@@ -468,7 +472,8 @@ class ProductVariant(DirtyFieldsMixin, models.Model):
             
             # Always recalculate Toman price using stored dollar price and current rate
             if self.price_in_dollor:
-                toman_price = self.price_in_dollor * Decimal(str(dollor_price))
+                # toman_price = self.price_in_dollor * Decimal(str(dollor_price))
+                toman_price = Decimal(str(self.price_in_dollor)) * Decimal(str(dollor_price))
             else:
                 # Fallback if price_in_dollor is not set yet
                 toman_price = self.input_price
@@ -476,7 +481,7 @@ class ProductVariant(DirtyFieldsMixin, models.Model):
             toman_price = self.input_price
             self.price_in_dollor = None
 
-        self.price = max(int(toman_price), self.min_price)
+        self.price = max(self.round_toman(toman_price), self.min_price)
 
     def save(self, *args, **kwargs):
         self.set_or_update_price()