From e9df03b49b3fb8b06222ee81b5ab1f27c83d02ff Mon Sep 17 00:00:00 2001
From: Adegoke David <64401859+Blazebrain@users.noreply.github.com>
Date: Fri, 4 Aug 2023 12:27:19 +0100
Subject: [PATCH] feat: Introduce QR Scanning to add new node (#1007)

* feat: Introduce QR Scanning to add new node

* fix: Exception handing for scan qr and invalid qr value

* fix: Exception handing for scan qr and invalid qr value
---
 .../nodes/node_create_or_edit_page.dart       | 13 ++++++
 lib/src/screens/nodes/widgets/node_form.dart  | 11 +++++
 .../node_create_or_edit_view_model.dart       | 42 ++++++++++++++++++-
 3 files changed, 64 insertions(+), 2 deletions(-)

diff --git a/lib/src/screens/nodes/node_create_or_edit_page.dart b/lib/src/screens/nodes/node_create_or_edit_page.dart
index 216238b54..c1b07d8c5 100644
--- a/lib/src/screens/nodes/node_create_or_edit_page.dart
+++ b/lib/src/screens/nodes/node_create_or_edit_page.dart
@@ -66,6 +66,19 @@ class NodeCreateOrEditPage extends BasePage {
   @override
   String get title => editingNode != null ? S.current.edit_node : S.current.node_new;
 
+  @override
+  Widget trailing(BuildContext context) => IconButton(
+        onPressed: () async {
+          await nodeCreateOrEditViewModel.scanQRCodeForNewNode();
+        },
+        splashColor: Colors.transparent,
+        highlightColor: Colors.transparent,
+        hoverColor: Colors.transparent,
+        icon: Image.asset(
+          'assets/images/qr_code_icon.png',
+        ),
+      );
+      
   final NodeCreateOrEditViewModel nodeCreateOrEditViewModel;
   final Node? editingNode;
   final bool? isSelected;
diff --git a/lib/src/screens/nodes/widgets/node_form.dart b/lib/src/screens/nodes/widgets/node_form.dart
index 8ee3ecd2f..91974fce5 100644
--- a/lib/src/screens/nodes/widgets/node_form.dart
+++ b/lib/src/screens/nodes/widgets/node_form.dart
@@ -44,6 +44,17 @@ class NodeForm extends StatelessWidget {
         }
       });
     }
+    reaction((_) => nodeViewModel.address, (String address) {
+      if (address != _addressController.text) {
+        _addressController.text = address;
+      }
+    });
+
+    reaction((_) => nodeViewModel.port, (String port) {
+      if (port != _portController.text) {
+        _portController.text = port;
+      }
+    });
 
     _addressController.addListener(() => nodeViewModel.address = _addressController.text);
     _portController.addListener(() => nodeViewModel.port = _portController.text);
diff --git a/lib/view_model/node_list/node_create_or_edit_view_model.dart b/lib/view_model/node_list/node_create_or_edit_view_model.dart
index 4433eb5b6..f749ed0d5 100644
--- a/lib/view_model/node_list/node_create_or_edit_view_model.dart
+++ b/lib/view_model/node_list/node_create_or_edit_view_model.dart
@@ -1,4 +1,5 @@
 import 'package:cake_wallet/core/execution_state.dart';
+import 'package:cake_wallet/entities/qr_scanner.dart';
 import 'package:cake_wallet/store/settings_store.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
@@ -8,10 +9,12 @@ import 'package:collection/collection.dart';
 
 part 'node_create_or_edit_view_model.g.dart';
 
-class NodeCreateOrEditViewModel = NodeCreateOrEditViewModelBase with _$NodeCreateOrEditViewModel;
+class NodeCreateOrEditViewModel = NodeCreateOrEditViewModelBase
+    with _$NodeCreateOrEditViewModel;
 
 abstract class NodeCreateOrEditViewModelBase with Store {
-  NodeCreateOrEditViewModelBase(this._nodeSource, this._walletType, this._settingsStore)
+  NodeCreateOrEditViewModelBase(
+      this._nodeSource, this._walletType, this._settingsStore)
       : state = InitialExecutionState(),
         connectionState = InitialExecutionState(),
         useSSL = false,
@@ -170,4 +173,39 @@ abstract class NodeCreateOrEditViewModelBase with Store {
 
   @action
   void setAsCurrent(Node node) => _settingsStore.nodes[_walletType] = node;
+
+  @action
+  Future<void> scanQRCodeForNewNode() async {
+    try {
+      String code = await presentQRScanner();
+
+      if (code.isEmpty) {
+        throw Exception('Unexpected scan QR code value: value is empty');
+      }
+
+      final uri = Uri.tryParse(code);
+
+      if (uri == null) {
+        throw Exception('Unexpected scan QR code value: Value is invalid');
+      }
+
+      final userInfo = uri.userInfo.split(':');
+   
+      if (userInfo.length < 2) {
+        throw Exception('Unexpected scan QR code value: Value is invalid');
+      }
+
+      final rpcUser = userInfo[0];
+      final rpcPassword = userInfo[1];
+      final ipAddress = uri.host;
+      final port = uri.port.toString();
+
+      setAddress(ipAddress);
+      setPassword(rpcPassword);
+      setLogin(rpcUser);
+      setPort(port);
+    } on Exception catch (e) {
+      connectionState = FailureState(e.toString());
+    }
+  }
 }