From f68750991ded7daf975b8a383f8a027c4c16ee0b Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Wed, 23 Dec 2015 05:33:21 -0800
Subject: [PATCH] add block.reward. add coinbase data to into. failsafe for
 getFee.

---
 lib/bcoin/block.js            | 21 +++++++++++++++++++++
 lib/bcoin/input.js            | 15 +++++++++------
 lib/bcoin/output.js           | 12 ++++++------
 lib/bcoin/protocol/network.js |  4 ++++
 lib/bcoin/tx.js               |  3 +++
 5 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index d213dbe6..1e3b38b6 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -7,6 +7,7 @@
 var bcoin = require('../bcoin');
 var utils = bcoin.utils;
 var constants = bcoin.protocol.constants;
+var network = bcoin.protocol.network;
 
 /**
  * Block
@@ -299,6 +300,26 @@ Block.prototype.__defineGetter__('rhash', function() {
   return utils.revHex(this.hash('hex'));
 });
 
+Block.reward = function reward(height) {
+  var halvings = height / network.halvingInterval | 0;
+  var reward;
+
+  if (height < 0)
+    return utils.satoshi('0.0');
+
+  if (halvings >= 64)
+    return utils.satoshi('0.0');
+
+  reward = utils.satoshi('50.0');
+  reward.iushrn(halvings);
+
+  return reward;
+};
+
+Block.prototype.__defineGetter__('reward', function() {
+  return Block.reward(this.height);
+});
+
 Block.prototype.inspect = function inspect() {
   var copy = bcoin.block(this, this.subtype);
   copy.__proto__ = null;
diff --git a/lib/bcoin/input.js b/lib/bcoin/input.js
index ae69247f..b4d393d6 100644
--- a/lib/bcoin/input.js
+++ b/lib/bcoin/input.js
@@ -115,7 +115,7 @@ Input.getData = function getData(input) {
       addr: '[unknown]',
       multisig: null,
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: new bn(0),
       script: s,
@@ -125,17 +125,20 @@ Input.getData = function getData(input) {
   }
 
   if (+input.out.hash === 0) {
+    data = bcoin.script.coinbase(input.script);
     return {
       type: 'coinbase',
       side: 'input',
+      coinbase: data,
+      height: data.height || -1,
       sig: null,
       pub: null,
       hash: '[coinbase]',
       addr: '[coinbase]',
       multisig: null,
       redeem: null,
-      data: null,
-      text: null,
+      flags: data.flags,
+      text: data.text,
       value: new bn(0),
       script: s,
       seq: input.seq,
@@ -173,7 +176,7 @@ Input.getData = function getData(input) {
       addr: '[unknown]',
       multisig: null,
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: new bn(0),
       script: s,
@@ -195,7 +198,7 @@ Input.getData = function getData(input) {
       addr: addr,
       multisig: null,
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: new bn(0),
       script: s,
@@ -260,7 +263,7 @@ Input.getData = function getData(input) {
     addr: '[unknown]',
     multisig: null,
     redeem: null,
-    data: null,
+    flags: null,
     text: null,
     value: new bn(0),
     script: s,
diff --git a/lib/bcoin/output.js b/lib/bcoin/output.js
index 89297864..364b445e 100644
--- a/lib/bcoin/output.js
+++ b/lib/bcoin/output.js
@@ -88,7 +88,7 @@ Output.getData = function getData(output) {
       addr: addr,
       multisig: null,
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: output.value,
       script: s,
@@ -109,7 +109,7 @@ Output.getData = function getData(output) {
       addr: addr,
       multisig: null,
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: output.value,
       script: s,
@@ -143,7 +143,7 @@ Output.getData = function getData(output) {
         })
       },
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: output.value,
       script: s,
@@ -171,7 +171,7 @@ Output.getData = function getData(output) {
         addrs: null
       },
       redeem: null,
-      data: null,
+      flags: null,
       text: null,
       value: output.value,
       script: s,
@@ -191,7 +191,7 @@ Output.getData = function getData(output) {
       addr: '[colored]',
       multisig: null,
       redeem: null,
-      data: ret,
+      flags: ret,
       text: utils.array2utf8(ret),
       value: output.value,
       script: s,
@@ -209,7 +209,7 @@ Output.getData = function getData(output) {
     addr: '[unknown]',
     multisig: null,
     redeem: null,
-    data: null,
+    flags: null,
     text: null,
     value: new bn(0),
     script: s,
diff --git a/lib/bcoin/protocol/network.js b/lib/bcoin/protocol/network.js
index d6c9413b..9d2d146b 100644
--- a/lib/bcoin/protocol/network.js
+++ b/lib/bcoin/protocol/network.js
@@ -80,6 +80,8 @@ main.checkpoints.tsLastCheckpoint = 1397080064;
 main.checkpoints.txsLastCheckpoint = 36544669;
 main.checkpoints.txsPerDay = 60000.0;
 
+main.halvingInterval = 210000;
+
 // http://blockexplorer.com/b/0
 // http://blockexplorer.com/rawblock/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f
 main.genesis = {
@@ -153,6 +155,8 @@ testnet.checkpoints.tsLastCheckpoint = 1338180505;
 testnet.checkpoints.txsLastCheckpoint = 16341;
 testnet.checkpoints.txsPerDay = 300;
 
+testnet.halvingInterval = 210000;
+
 // http://blockexplorer.com/testnet/b/0
 // http://blockexplorer.com/testnet/rawblock/000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943
 testnet.genesis =  {
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index 025fbe5c..a769e2d2 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -795,6 +795,9 @@ TX.prototype._recalculateFee = function recalculateFee() {
 };
 
 TX.prototype.getFee = function getFee() {
+  if (this.funds('in').cmp(this.funds('out')) < 0)
+    return new bn(0);
+
   return this.funds('in').sub(this.funds('out'));
 };