feat(BE-278): add delete document s3

internal/modules/purchases/services/purchase.service.go

@@ -1097,6 +1097,10 @@ func (s *purchaseService) DeleteItems(c *fiber.Ctx, id uint, req *validation.Del
 		return nil, utils.Internal("Failed to delete purchase items")
 	}
 
+	if err := s.deletePurchaseItemDocuments(ctx, itemsToDelete); err != nil {
+		return nil, utils.Internal("Failed to delete purchase documents")
+	}
+
 	if len(itemsToDelete) > 0 {
 		if err := s.notifyExpenseItemsDeleted(ctx, purchase.Id, itemsToDelete); err != nil {
 			s.Log.Errorf("Failed to sync expense deletion for purchase %d: %+v", purchase.Id, err)
@@ -1156,6 +1160,10 @@ func (s *purchaseService) DeletePurchase(c *fiber.Ctx, id uint) error {
 		return utils.Internal("Failed to delete purchase")
 	}
 
+	if err := s.deletePurchaseItemDocuments(ctx, itemsToDelete); err != nil {
+		return utils.Internal("Failed to delete purchase documents")
+	}
+
 	if len(itemsToDelete) > 0 {
 		if err := s.notifyExpenseItemsDeleted(ctx, uint(id), itemsToDelete); err != nil {
 			s.Log.Errorf("Failed to sync expense deletion for purchase %d: %+v", id, err)
@@ -1239,6 +1247,21 @@ func (s *purchaseService) notifyExpenseItemsDeleted(ctx context.Context, purchas
 
 }
 
+func (s *purchaseService) deletePurchaseItemDocuments(ctx context.Context, items []entity.PurchaseItem) error {
+	if s.DocumentSvc == nil || len(items) == 0 {
+		return nil
+	}
+	for _, item := range items {
+		if item.Id == 0 {
+			continue
+		}
+		if err := s.DocumentSvc.DeleteByTarget(ctx, string(utils.DocumentableTypePurchaseItem), uint64(item.Id), true); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (s *purchaseService) buildStaffAdjustmentPayload(
 	ctx context.Context,
 	purchase *entity.Purchase,