From 35633848e26dcf8cdc928de8df31f14eb9ee918c Mon Sep 17 00:00:00 2001
From: Czarek Nakamoto <cyjan@mrcyjanek.net>
Date: Fri, 23 Aug 2024 12:23:30 +0200
Subject: ledger changes

---
 impls/monero.dart/lib/src/ledger.dart | 79 +++++++++++++++++++++++++++++++++++
 impls/monero.dart/pubspec.yaml        |  6 ++-
 2 files changed, 84 insertions(+), 1 deletion(-)
 create mode 100644 impls/monero.dart/lib/src/ledger.dart

diff --git a/impls/monero.dart/lib/src/ledger.dart b/impls/monero.dart/lib/src/ledger.dart
new file mode 100644
index 0000000..b24bced
--- /dev/null
+++ b/impls/monero.dart/lib/src/ledger.dart
@@ -0,0 +1,79 @@
+import 'dart:async';
+import 'dart:ffi';
+import 'dart:typed_data';
+
+import 'package:ffi/ffi.dart';
+import 'package:ledger_flutter/src/ledger.dart';
+import 'package:ledger_flutter/src/ledger/ledger_operation.dart';
+import 'package:ledger_flutter/src/models/ledger_device.dart';
+import 'package:ledger_flutter/src/utils/buffer.dart';
+import 'package:monero/monero.dart' as monero;
+
+Timer? _ledgerExchangeTimer;
+Uint8List _lastLedgerRequest = Uint8List(0);
+
+void enableLedgerExchange(
+    monero.wallet ptr, Ledger ledger, LedgerDevice device) {
+  _ledgerExchangeTimer = Timer.periodic(Duration(milliseconds: 1), (_) async {
+    final ledgerRequestLength = monero.Wallet_getSendToDeviceLength(ptr);
+    final ledgerRequest = monero.Wallet_getSendToDevice(ptr)
+        .cast<Uint8>()
+        .asTypedList(ledgerRequestLength);
+    if (ledgerRequestLength > 0 && _lastLedgerRequest != ledgerRequest) {
+      final response = await exchange(ledger, device, ledgerRequest);
+
+      final Pointer<Uint8> result = malloc<Uint8>(response.length);
+      result.asTypedList(response.length).addAll(response);
+      monero.Wallet_setDeviceReceivedData(
+          ptr, result.cast<UnsignedChar>(), response.length);
+
+      monero.Wallet_setDeviceSendData(
+          ptr, malloc<Uint8>(0).cast<UnsignedChar>(), 0);
+    }
+  });
+}
+
+void disableLedgerExchange() {
+  _ledgerExchangeTimer?.cancel();
+}
+
+Future<Uint8List> exchange(
+    Ledger ledger, LedgerDevice device, Uint8List data) async {
+  return ledger.sendOperation<Uint8List>(
+    device,
+    ExchangeOperation(
+      cla: 0x00,
+      ins: 0x00,
+      p1: 0x00,
+      p2: 0x00,
+      inputData: data,
+    ),
+  );
+}
+
+class ExchangeOperation extends LedgerOperation<Uint8List> {
+  final int cla;
+  final int ins;
+  final int p1;
+  final int p2;
+  final Uint8List inputData;
+
+  ExchangeOperation({
+    required this.cla,
+    required this.ins,
+    required this.p1,
+    required this.p2,
+    required this.inputData,
+  });
+
+  @override
+  Future<Uint8List> read(ByteDataReader reader) async =>
+      reader.read(reader.remainingLength);
+
+  @override
+  Future<List<Uint8List>> write(ByteDataWriter writer) async {
+    writer.write(inputData);
+
+    return [writer.toBytes()];
+  }
+}
diff --git a/impls/monero.dart/pubspec.yaml b/impls/monero.dart/pubspec.yaml
index 4f48698..4c6254b 100644
--- a/impls/monero.dart/pubspec.yaml
+++ b/impls/monero.dart/pubspec.yaml
@@ -8,8 +8,12 @@ environment:
 
 dependencies:
   ffi: ^2.1.0
+  ledger_flutter:
+    git:
+      url: https://github.com/MrCyjaneK/ledger-flutter
+      ref: d68f1be485717bedad0779ee6114afec1896fbc9
 
 dev_dependencies:
   lints: ^4.0.0
   test: ^1.24.0
-  ffigen: ^13.0.0
\ No newline at end of file
+  ffigen: ^13.0.0
-- 
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