From 399052d95a702a499ec108f5bff9ad4f09f0e127 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Thu, 31 Mar 2016 04:47:41 -0700
Subject: [PATCH] fee calculation.

---
 lib/bcoin/mtx.js |  7 +++----
 lib/bcoin/tx.js  | 14 ++++++++++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index f97c8948..47add704 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -875,16 +875,15 @@ MTX.prototype.selectCoins = function selectCoins(coins, options) {
       size = tx.maxSize(options.m, options.n);
 
       if (options.free) {
-        if (newkb == null && tx.isFree(null, size)) {
+        if (tx.isFree(null, size)) {
           fee = new bn(0);
           break;
         }
+        options.free = false;
       }
 
       if (options.accurate) {
-        newkb = size / 1024;
-        fee = new bn(newkb * minFee | 0);
-        totalkb = newkb;
+        fee = tx.getMinFee(size);
       } else {
         newkb = Math.ceil(size / 1024) - totalkb;
         fee.iaddn(newkb * minFee);
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 696d6da6..3e5bedb7 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -1066,6 +1066,20 @@ TX.prototype.getMinFee = function getMinFee(size) {
   return fee;
 };
 
+TX.prototype.getMaxFee = function getMaxFee(size) {
+  var fee;
+
+  if (size == null)
+    size = this.maxSize();
+
+  fee = new bn(constants.tx.minFee).muln(Math.ceil(size / 1000));
+
+  if (fee.cmpn(0) === 0 && constants.tx.minFee > 0)
+    fee = new bn(constants.tx.minFee);
+
+  return fee;
+};
+
 TX.prototype.getConfirmations = function getConfirmations(height) {
   if (height == null)
     height = network.height;