update

inventory/services.py

@@ -0,0 +1,43 @@
+from decimal import Decimal
+
+from .models import Item
+
+
+class PricingSuggestionService:
+    def suggest_for_item(self, item: Item):
+        recent_comp = (
+            Item.objects.filter(status=Item.Status.SOLD, category=item.category)
+            .exclude(sold_price__isnull=True)
+            .order_by("-sold_at", "-created_at")
+            .values_list("sold_price", flat=True)[:5]
+        )
+        recent_prices = list(recent_comp)
+
+        if recent_prices:
+            average_price = sum(recent_prices) / len(recent_prices)
+            return {
+                "price": average_price.quantize(Decimal("0.01")),
+                "source": "Recent sold comps",
+                "notes": f"Based on {len(recent_prices)} recent sold items in {item.category}.",
+            }
+
+        if item.estimated_resale_price is not None:
+            return {
+                "price": item.estimated_resale_price,
+                "source": "Item estimate",
+                "notes": "Using the item's existing estimated resale price.",
+            }
+
+        if item.template and item.template.default_estimated_resale_price is not None:
+            return {
+                "price": item.template.default_estimated_resale_price,
+                "source": "Template default",
+                "notes": "Using the template's default resale estimate.",
+            }
+
+        fallback = (item.purchase_price * Decimal("1.75")).quantize(Decimal("0.01"))
+        return {
+            "price": fallback,
+            "source": "Purchase-price fallback",
+            "notes": "No sold comps yet; using a purchase-price multiple as a starting point.",
+        }