fix: correct confirmations for UTXOs in wallet FFI

key-wallet-ffi/src/utxo.rs

@@ -119,12 +119,8 @@ pub unsafe extern "C" fn managed_wallet_get_utxos(
             // Get script bytes
             let script_bytes = utxo.txout.script_pubkey.as_bytes().to_vec();
 
-            // Calculate confirmations (0 if unconfirmed)
-            let confirmations = if utxo.is_confirmed {
-                1
-            } else {
-                0
-            };
+            let current_height = managed_info.inner().synced_height();
+            let confirmations = utxo.confirmations(current_height);
 
             let ffi_utxo = FFIUTXO::new(
                 txid_bytes,

key-wallet-ffi/src/utxo_tests.rs

@@ -235,7 +235,7 @@ mod utxo_tests {
         managed_info.accounts.insert(bip44_account);
 
         let ffi_managed_info = Box::into_raw(Box::new(FFIManagedWalletInfo::new(managed_info)));
-
+        unsafe { (*ffi_managed_info).inner_mut() }.update_synced_height(300);
         let result = unsafe {
             managed_wallet_get_utxos(&*ffi_managed_info, &mut utxos_out, &mut count_out, error)
         };
@@ -254,19 +254,21 @@ mod utxo_tests {
             assert_eq!(utxos[0].vout, 0);
             assert_eq!(utxos[0].amount, 50000);
             assert_eq!(utxos[0].height, 100);
-            assert_eq!(utxos[0].confirmations, 1);
+            assert_eq!(utxos[0].confirmations, 201);
 
             // Check second UTXO
             assert_eq!(utxos[1].txid[0], 1);
             assert_eq!(utxos[1].vout, 1);
             assert_eq!(utxos[1].amount, 100000);
             assert_eq!(utxos[1].height, 101);
+            assert_eq!(utxos[1].confirmations, 200);
 
             // Check third UTXO
             assert_eq!(utxos[2].txid[0], 2);
             assert_eq!(utxos[2].vout, 2);
             assert_eq!(utxos[2].amount, 150000);
             assert_eq!(utxos[2].height, 102);
+            assert_eq!(utxos[2].confirmations, 199);
         }
 
         // Clean up

key-wallet/Cargo.toml

@@ -50,3 +50,4 @@ async-trait = "0.1"
 hex = "0.4"
 key-wallet = { path = ".", features = ["test-utils", "bip38", "serde", "bincode", "eddsa", "bls"] }
 tokio = { version = "1", features = ["macros", "rt"] }
+test-case = "3.3"

key-wallet/src/utxo.rs

@@ -86,6 +86,15 @@ impl Utxo {
         }
     }
 
+    /// Get the number of confirmations for this UTXO
+    pub fn confirmations(&self, current_height: u32) -> u32 {
+        if self.is_confirmed && current_height >= self.height {
+            current_height - self.height + 1
+        } else {
+            0
+        }
+    }
+
     /// Lock this UTXO to prevent it from being selected
     pub fn lock(&mut self) {
         self.is_locked = true;
@@ -307,6 +316,7 @@ impl Default for UtxoSet {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use test_case::test_case;
 
     #[test]
     fn test_utxo_spendability() {
@@ -350,4 +360,19 @@ mod tests {
         assert_eq!(set.len(), 1);
         assert_eq!(set.total_balance(), 200000);
     }
+
+    #[test_case(false, 0, 500, 0 ; "unconfirmed utxo has 0 confirmations")]
+    #[test_case(true, 0, 500, 501 ; "confirmed utxo at genesis height has 501 confirmations")]
+    #[test_case(true, 1000, 500, 0 ; "utxo height greater than current height has 0 confirmations")]
+    #[test_case(true, 500, 500, 1 ; "utxo at current height has 1 confirmation")]
+    #[test_case(true, 100, 500, 401 ; "normal case has current_height minus utxo_height plus 1 confirmations")]
+    fn test_confirmations(
+        is_confirmed: bool,
+        utxo_height: u32,
+        current_height: u32,
+        expected: u32,
+    ) {
+        let utxo = Utxo::new_test(0, 100000, utxo_height, false, is_confirmed);
+        assert_eq!(utxo.confirmations(current_height), expected);
+    }
 }