Add app/services/stock_service.py

app/services/stock_service.py

@@ -0,0 +1,54 @@
+from sqlalchemy.orm import Session
+from app.models.product import Product
+from app.models.stock_movement import StockMovement, MovementType
+from app.schemas.stock_movement import StockMoveRequest
+
+
+def register_movement(db: Session, data: StockMoveRequest) -> tuple[StockMovement | None, str]:
+    prod = db.query(Product).filter(Product.id == data.product_id).first()
+    if not prod:
+        return None, "Producto no encontrado"
+
+    movement_type = MovementType(data.type)
+
+    # Validate stock for OUT movements
+    if movement_type == MovementType.OUT and prod.current_stock < data.quantity:
+        return None, "Stock insuficiente"
+
+    # Update product stock
+    if movement_type == MovementType.IN:
+        prod.current_stock += data.quantity
+    elif movement_type == MovementType.OUT:
+        prod.current_stock -= data.quantity
+    else:  # ADJUST
+        prod.current_stock = data.quantity
+
+    # Record movement
+    movement = StockMovement(
+        product_id=data.product_id,
+        type=movement_type,
+        quantity=data.quantity,
+        reason=data.reason,
+    )
+    db.add(movement)
+    db.commit()
+    db.refresh(movement)
+    return movement, ""
+
+
+def get_product_history(db: Session, product_id: str):
+    return db.query(StockMovement).filter(StockMovement.product_id == product_id).all()
+
+
+def get_stock_summary(db: Session):
+    products = db.query(Product).all()
+    return [
+        {
+            "product_id": p.id,
+            "product_name": p.name,
+            "current_stock": p.current_stock,
+            "min_stock": p.min_stock,
+            "is_low_stock": p.current_stock < p.min_stock,
+        }
+        for p in products
+    ]