From d0a75fd26809d47fddf0c432bd8f6e6a9a522c64 Mon Sep 17 00:00:00 2001
From: Craig Raw <craigraw@gmail.com>
Date: Sat, 30 May 2020 13:15:28 +0200
Subject: [PATCH] highest used index

---
 .../com/sparrowwallet/drongo/wallet/Wallet.java     | 13 ++++++++++++-
 .../com/sparrowwallet/drongo/wallet/WalletNode.java |  6 ++++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java b/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
index 2a0700e..b293edf 100644
--- a/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
+++ b/src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java
@@ -105,7 +105,7 @@ public class Wallet {
     public int getLookAhead(WalletNode node) {
         //TODO: Calculate using seen transactions
         int lookAhead = DEFAULT_LOOKAHEAD;
-        Integer maxIndex = node.getHighestIndex();
+        Integer maxIndex = node.getHighestUsedIndex();
         if(maxIndex != null) {
             lookAhead = Math.max(maxIndex + lookAhead/2, lookAhead);
         }
@@ -193,6 +193,17 @@ public class Wallet {
         }
     }
 
+    public void clearHistory() {
+        for(WalletNode purposeNode : purposeNodes) {
+            purposeNode.getHistory().clear();
+            for(WalletNode addressNode : purposeNode.getChildren()) {
+                addressNode.getHistory().clear();
+            }
+        }
+
+        transactions.clear();
+    }
+
     public boolean isValid() {
         if(policyType == null || scriptType == null || defaultPolicy == null || keystores.isEmpty()) {
             return false;
diff --git a/src/main/java/com/sparrowwallet/drongo/wallet/WalletNode.java b/src/main/java/com/sparrowwallet/drongo/wallet/WalletNode.java
index baafaee..40890a7 100644
--- a/src/main/java/com/sparrowwallet/drongo/wallet/WalletNode.java
+++ b/src/main/java/com/sparrowwallet/drongo/wallet/WalletNode.java
@@ -112,10 +112,12 @@ public class WalletNode implements Comparable<WalletNode> {
         }
     }
 
-    public Integer getHighestIndex() {
+    public Integer getHighestUsedIndex() {
         WalletNode highestNode = null;
         for(WalletNode childNode : getChildren()) {
-            highestNode = childNode;
+            if(!childNode.getHistory().isEmpty()) {
+                highestNode = childNode;
+            }
         }
 
         return highestNode == null ? null : highestNode.index;