Convert getOrderBook and add unit test

src/api/ledger/parse/order.js

@@ -1,11 +1,28 @@
 /* @flow */
 'use strict';
 const assert = require('assert');
-const parseOrderBase = require('./order-base');
+const utils = require('./utils');
+const parseAmount = require('./amount');
+const flags = utils.core.Transaction.flags.OfferCreate;
 
 function parseOrder(tx: Object): Object {
   assert(tx.TransactionType === 'OfferCreate');
-  return parseOrderBase(tx.TakerGets, tx.TakerPays, tx.Flags);
+
+  const direction = (tx.Flags & flags.Sell) === 0 ? 'buy' : 'sell';
+  const takerGetsAmount = parseAmount(tx.TakerGets);
+  const takerPaysAmount = parseAmount(tx.TakerPays);
+  const quantity = (direction === 'buy') ? takerPaysAmount : takerGetsAmount;
+  const totalPrice = (direction === 'buy') ? takerGetsAmount : takerPaysAmount;
+
+  return utils.removeUndefined({
+    direction: direction,
+    quantity: quantity,
+    totalPrice: totalPrice,
+    passive: ((tx.Flags & flags.Passive) !== 0) || undefined,
+    immediateOrCancel: ((tx.Flags & flags.ImmediateOrCancel) !== 0)
+      || undefined,
+    fillOrKill: ((tx.Flags & flags.FillOrKill) !== 0) || undefined
+  });
 }
 
 module.exports = parseOrder;