[refactor] Scan improvements (#577)

* Handle error on unexpected barcode response

* Add ManufacturerPart detail view

* Support barcode scanning for manufacturer part

* Refactoring for null checks

* Ignore selected errors in sentry

* Fix API implementation for ManufacturerPart

* Update release notes

* More error handling

* Decode quantity betterer

* Refactoring

* Add option to confirm checkin details

* Improve response handlign

* Cleanup

* Remove unused imports

* Fix async function

* Fix for assigning custom barcode

* Handle barcode scan result for company

* Fix

* Adjust scan priority

* Refactoring MODEL_TYPE

- Use instead of duplicated const strings

* @override fix

lib/barcode/purchase_order.dart

@@ -1,9 +1,7 @@
 import "package:flutter/material.dart";
-import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
+import "package:inventree/preferences.dart";
 import "package:one_context/one_context.dart";
-
 import "package:inventree/l10.dart";
-import "package:inventree/api_form.dart";
 
 import "package:inventree/barcode/barcode.dart";
 import "package:inventree/barcode/handler.dart";
@@ -23,10 +21,11 @@ import "package:inventree/widget/snacks.dart";
  */
 class POReceiveBarcodeHandler extends BarcodeHandler {
 
-  POReceiveBarcodeHandler({this.purchaseOrder, this.location});
+  POReceiveBarcodeHandler({this.purchaseOrder, this.location, this.lineItem});
 
   InvenTreePurchaseOrder? purchaseOrder;
   InvenTreeStockLocation? location;
+  InvenTreePOLineItem? lineItem;
 
   @override
   String getOverlayText(BuildContext context) => L10().barcodeReceivePart;
@@ -34,11 +33,15 @@ class POReceiveBarcodeHandler extends BarcodeHandler {
   @override
   Future<void> processBarcode(String barcode,
       {String url = "barcode/po-receive/",
-        Map<String, dynamic> extra_data = const {}}) {
+        Map<String, dynamic> extra_data = const {}}) async {
+
+    final bool confirm = await InvenTreeSettingsManager().getBool(INV_PO_CONFIRM_SCAN, true);
 
     final po_extra_data = {
       "purchase_order": purchaseOrder?.pk,
       "location": location?.pk,
+      "line_item": lineItem?.pk,
+      "auto_allocate": !confirm,
       ...extra_data,
     };
 
@@ -47,11 +50,13 @@ class POReceiveBarcodeHandler extends BarcodeHandler {
 
   @override
   Future<void> onBarcodeMatched(Map<String, dynamic> data) async {
-    if (!data.containsKey("lineitem")) {
+
+    if (data.containsKey("lineitem") || data.containsKey("success")) {
+      barcodeSuccess(L10().receivedItem);
+      return;
+    } else {
       return onBarcodeUnknown(data);
     }
-
-    barcodeSuccess(L10().receivedItem);
   }
 
   @override
@@ -66,49 +71,41 @@ class POReceiveBarcodeHandler extends BarcodeHandler {
       showSnackIcon(L10().missingData, success: false);
     }
 
-    // Construct fields to receive
-    Map<String, dynamic> fields = {
-      "line_item": {
-        "parent": "items",
-        "nested": true,
-        "hidden": true,
-        "value": lineItemData["pk"] as int,
-      },
-      "quantity": {
-        "parent": "items",
-        "nested": true,
-        "value": lineItemData["quantity"] as double?,
-      },
-      "status": {
-        "parent": "items",
-        "nested": true,
-      },
-      "location": {
-        "value": lineItemData["location"] as int?,
-      },
-      "barcode": {
-        "parent": "items",
-        "nested": true,
-        "hidden": true,
-        "type": "barcode",
-        "value": data["barcode_data"] as String,
+    // At minimum, we need the line item ID value
+    final int? lineItemId = lineItemData["pk"] as int?;
+
+    if (lineItemId == null) {
+      barcodeFailureTone();
+      return;
+    }
+
+    InvenTreePOLineItem? lineItem = await InvenTreePOLineItem().get(lineItemId) as InvenTreePOLineItem?;
+
+    if (lineItem == null) {
+      barcodeFailureTone();
+      return;
+    }
+
+    // Next, extract the "optional" fields
+
+    // Extract information from the returned server response
+    double? quantity = double.tryParse((lineItemData["quantity"] ?? "0").toString());
+    int? destination = lineItemData["location"] as int?;
+    String? barcode = data["barcode_data"] as String?;
+
+    // Discard the barcode scanner at this stage
+    if (OneContext.hasContext) {
+      OneContext().pop();
+    }
+
+    await lineItem.receive(
+      OneContext().context!,
+      destination: destination,
+      quantity: quantity,
+      barcode: barcode,
+      onSuccess: () {
+        showSnackIcon(L10().receivedItem, success: true);
       }
-    };
-
-    final context = OneContext().context!;
-    final purchase_order_pk = lineItemData["purchase_order"];
-    final receive_url = "${InvenTreePurchaseOrder().URL}${purchase_order_pk}/receive/";
-
-    launchApiForm(
-        context,
-        L10().receiveItem,
-        receive_url,
-        fields,
-        method: "POST",
-        icon: TablerIcons.transition_right,
-        onSuccess: (data) async {
-          showSnackIcon(L10().receivedItem, success: true);
-        }
     );
   }