From 6cb31493223039a79be9e723b70518c0fe4405a1 Mon Sep 17 00:00:00 2001
From: Konstantin Ullrich <konstantinullrich12@gmail.com>
Date: Mon, 6 Jul 2026 14:42:03 +0200
Subject: [PATCH] feat: add lightning preimage to transaction details

---
 .../lib/lightning/lightning_wallet.dart       | 10 ++++++++-
 .../transaction_details_view_model.dart       | 21 +++++++++++--------
 res/values/strings_en.arb                     |  3 ++-
 3 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/cw_bitcoin/lib/lightning/lightning_wallet.dart b/cw_bitcoin/lib/lightning/lightning_wallet.dart
index d93a84b58..42dda7cb2 100644
--- a/cw_bitcoin/lib/lightning/lightning_wallet.dart
+++ b/cw_bitcoin/lib/lightning/lightning_wallet.dart
@@ -441,6 +441,11 @@ class LightningWallet {
       direction = TransactionDirection.incoming;
     }
 
+    String? preimage;
+    if (payment.details != null && payment.details is PaymentDetails_Lightning) {
+      preimage = (payment.details as PaymentDetails_Lightning).htlcDetails.preimage;
+    }
+
     return ElectrumTransactionInfo(
       WalletType.bitcoin,
       id: payment.id,
@@ -450,7 +455,10 @@ class LightningWallet {
       fee: Money(payment.fees, currency),
       date: DateTime.fromMillisecondsSinceEpoch(payment.timestamp.toInt() * 1000),
       confirmations: payment.status == PaymentStatus.pending ? 0 : 10,
-      additionalInfo: {"isLightning": true},
+      additionalInfo: {
+        "isLightning": true,
+        if (preimage != null) "preimage": preimage,
+      },
     );
   }
 
diff --git a/lib/view_model/transaction_details_view_model.dart b/lib/view_model/transaction_details_view_model.dart
index 7199ed1a9..0cc1bdb82 100644
--- a/lib/view_model/transaction_details_view_model.dart
+++ b/lib/view_model/transaction_details_view_model.dart
@@ -9,7 +9,6 @@ import 'package:cake_wallet/zano/zano.dart';
 import 'package:cw_core/crypto_amount_format.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/currency_for_wallet_type.dart';
-import 'package:cw_core/utils/print_verbose.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/transaction_info.dart';
 import 'package:cw_core/wallet_type.dart';
@@ -50,10 +49,9 @@ String _moneroRecipientAddressForDisplay(String raw, WalletType walletType) {
   return match?.group(0) ?? raw.trim();
 }
 
-bool isLightning(TransactionInfo tx) {
-  printV(tx.additionalInfo);
-  return (tx.additionalInfo["isLightning"] as bool?) ?? false;
-}
+bool isLightning(TransactionInfo tx) => (tx.additionalInfo["isLightning"] as bool?) ?? false;
+
+bool hasLightningPreimage(TransactionInfo tx) => (tx.additionalInfo["preimage"] as String?) != null;
 
 class TxDetailRowDefinition {
   final String keyString;
@@ -188,6 +186,13 @@ class TxDetailRowDefinition {
         },
         applicable: (vm) => vm.wallet.type == WalletType.monero),
 
+    TxDetailRowDefinition(
+      keyString: "standard_list_item_lightning_preimage",
+      title: S.current.transaction_preimage,
+      valueGetter: (vm) => vm.transactionInfo.additionalInfo['preimage'] as String? ?? "",
+      applicable: (vm) =>
+          hasLightningPreimage(vm.transactionInfo) && isLightning(vm.transactionInfo),
+    ),
 
     TxDetailRowDefinition(
         keyString: "standard_list_item_transaction_confirmed_key",
@@ -316,10 +321,9 @@ abstract class TransactionDetailsViewModelBase with Store {
   TransactionPriority? transactionPriority;
 
   CryptoCurrency get transactionAsset {
+    if (isEVMCompatibleChain(wallet.type)) return evm!.assetOfTransaction(wallet, transactionInfo);
 
-    if (isEVMCompatibleChain(wallet.type)) {
-      return evm!.assetOfTransaction(wallet, transactionInfo);
-    }
+    if (isLightning(transactionInfo)) return CryptoCurrency.btcln;
 
     return switch (wallet.type) {
       WalletType.solana => solana!.assetOfTransaction(wallet, transactionInfo),
@@ -329,7 +333,6 @@ abstract class TransactionDetailsViewModelBase with Store {
     };
   }
 
-
   // TODO integrate these getters with the TransactionInfo object
   String get formattedPendingStatus {
     switch (wallet.type) {
diff --git a/res/values/strings_en.arb b/res/values/strings_en.arb
index 1debd0a8f..1523c53e2 100644
--- a/res/values/strings_en.arb
+++ b/res/values/strings_en.arb
@@ -1253,6 +1253,7 @@
   "transaction_error": "Transaction Error",
   "transaction_key": "Transaction Key",
   "transaction_memo_optional": "Transaction Memo (optional)",
+  "transaction_preimage": "Preimage",
   "transaction_priority_fast": "Fast",
   "transaction_priority_fastest": "Fastest",
   "transaction_priority_medium": "Medium",
@@ -1452,4 +1453,4 @@
   "zcash_card_missing_funds": "Missing funds?",
   "zcash_card_scan": "Scan",
   "zcash_card_warning": "Do not close the app until the procedure completes, if you do so this process will need to restart from scratch."
-}
\ No newline at end of file
+}