From f3d2ba2591cec5b395e6987009c371d15ac96018 Mon Sep 17 00:00:00 2001
From: pokkst <pokkst@protonmail.com>
Date: Sat, 24 Sep 2022 02:57:46 -0500
Subject: [PATCH] Add estimate fee method, but based on Monero's code it
 doesn't seem to take priority into account

---
 app/src/main/cpp/monerujo.cpp                 | 41 +++++++++++++++++++
 .../dialog/SendBottomSheetDialog.java         |  2 +
 .../java/net/mynero/wallet/model/Wallet.java  |  9 ++++
 3 files changed, 52 insertions(+)

diff --git a/app/src/main/cpp/monerujo.cpp b/app/src/main/cpp/monerujo.cpp
index 21489de..1fafbd9 100644
--- a/app/src/main/cpp/monerujo.cpp
+++ b/app/src/main/cpp/monerujo.cpp
@@ -41,6 +41,7 @@ static jclass class_Transfer;
 static jclass class_Ledger;
 static jclass class_WalletStatus;
 static jclass class_CoinsInfo;
+static jclass class_Pair;
 
 std::mutex _listenerMutex;
 
@@ -55,6 +56,8 @@ JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
 
     class_ArrayList = static_cast<jclass>(jenv->NewGlobalRef(
             jenv->FindClass("java/util/ArrayList")));
+    class_Pair = static_cast<jclass>(jenv->NewGlobalRef(
+            jenv->FindClass("android/util/Pair")));
     class_TransactionInfo = static_cast<jclass>(jenv->NewGlobalRef(
             jenv->FindClass("net/mynero/wallet/model/TransactionInfo")));
     class_Transfer = static_cast<jclass>(jenv->NewGlobalRef(
@@ -249,6 +252,34 @@ std::set<std::string> java2cpp_set(JNIEnv *env, jobject arrayList) {
     return result;
 }
 
+std::pair<std::string, uint64_t> extract_pair(JNIEnv *env, jobject p) {
+    jfieldID first = env->GetFieldID(class_Pair, "first", "Ljava/lang/Object;");
+    jfieldID second = env->GetFieldID(class_Pair, "second", "Ljava/lang/Object;");
+    jstring string = static_cast<jstring>(env->GetObjectField(p, first));
+    std::string converted_string = env->GetStringUTFChars(string, nullptr);
+    uint64_t value = reinterpret_cast<uint64_t>(env->GetObjectField(p, second));
+    auto pair = std::make_pair(converted_string, value);
+    return pair;
+}
+
+std::vector<std::pair<std::string, uint64_t>> java2cpp_pairvector(JNIEnv *env, jobject arrayList) {
+
+    jmethodID java_util_ArrayList_size = env->GetMethodID(class_ArrayList, "size", "()I");
+    jmethodID java_util_ArrayList_get = env->GetMethodID(class_ArrayList, "get",
+                                                         "(I)Ljava/lang/Object;");
+
+    jint len = env->CallIntMethod(arrayList, java_util_ArrayList_size);
+    std::vector<std::pair<std::string, uint64_t>> result;
+
+    for (jint i = 0; i < len; i++) {
+        jobject element = static_cast<jobject>(env->CallObjectMethod(arrayList,
+                                                                     java_util_ArrayList_get, i));
+        auto pair = extract_pair(env, element);
+        result.emplace_back(pair);
+    }
+    return result;
+}
+
 jobject cpp2java(JNIEnv *env, const std::vector<std::string> &vector) {
 
     jmethodID java_util_ArrayList_ = env->GetMethodID(class_ArrayList, "<init>", "(I)V");
@@ -998,6 +1029,16 @@ Java_net_mynero_wallet_model_Wallet_createTransactionJ(JNIEnv *env, jobject inst
     return reinterpret_cast<jlong>(tx);
 }
 
+JNIEXPORT jlong JNICALL
+Java_net_mynero_wallet_model_Wallet_estimateTransactionFee(JNIEnv *env, jobject instance,
+                                                           jobject destinations, jint priority) {
+    std::vector<std::pair<std::string, uint64_t>> dest_vector = java2cpp_pairvector(env, destinations);
+    Monero::PendingTransaction::Priority _priority = static_cast<Monero::PendingTransaction::Priority>(priority);
+    Monero::Wallet *wallet = getHandle<Monero::Wallet>(env, instance);
+    uint64_t fee = wallet->estimateTransactionFee(dest_vector, _priority);
+    return fee;
+}
+
 JNIEXPORT jlong JNICALL
 Java_net_mynero_wallet_model_Wallet_createTransactionSingleJ(JNIEnv *env, jobject instance,
                                                              jstring key_image, jstring dst_addr,
diff --git a/app/src/main/java/net/mynero/wallet/fragment/dialog/SendBottomSheetDialog.java b/app/src/main/java/net/mynero/wallet/fragment/dialog/SendBottomSheetDialog.java
index 6d8870b..a66d3d6 100644
--- a/app/src/main/java/net/mynero/wallet/fragment/dialog/SendBottomSheetDialog.java
+++ b/app/src/main/java/net/mynero/wallet/fragment/dialog/SendBottomSheetDialog.java
@@ -4,6 +4,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.util.Pair;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -30,6 +31,7 @@ import net.mynero.wallet.R;
 import net.mynero.wallet.model.CoinsInfo;
 import net.mynero.wallet.model.PendingTransaction;
 import net.mynero.wallet.model.Wallet;
+import net.mynero.wallet.model.WalletManager;
 import net.mynero.wallet.service.BalanceService;
 import net.mynero.wallet.service.TxService;
 import net.mynero.wallet.service.UTXOService;
diff --git a/app/src/main/java/net/mynero/wallet/model/Wallet.java b/app/src/main/java/net/mynero/wallet/model/Wallet.java
index 5dff2df..18a14ea 100644
--- a/app/src/main/java/net/mynero/wallet/model/Wallet.java
+++ b/app/src/main/java/net/mynero/wallet/model/Wallet.java
@@ -16,6 +16,8 @@
 
 package net.mynero.wallet.model;
 
+import android.util.Pair;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
@@ -273,6 +275,13 @@ public class Wallet {
         }
     }
 
+    public long estimateTransactionFee(List<Pair<String, Long>> destinations, PendingTransaction.Priority priority) {
+        int _priority = priority.getValue();
+        return estimateTransactionFee(destinations, _priority);
+    }
+
+    private native long estimateTransactionFee(List<Pair<String, Long>> destinations, int priority);
+
     public PendingTransaction createTransaction(TxData txData) {
         return createTransaction(
                 txData.getDestinationAddress(),