From db61420bee0c62b9e2f198960806135c89420140 Mon Sep 17 00:00:00 2001
From: Josh Harvey <josh@lamassu.is>
Date: Thu, 8 Sep 2016 16:45:28 +0300
Subject: [PATCH] WIP

---
 lib/config.js | 61 +++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 59 insertions(+), 2 deletions(-)

diff --git a/lib/config.js b/lib/config.js
index 3956e780..69ca6071 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -1,12 +1,13 @@
 var pgp = require('pg-promise')()
 var psqlUrl = require('../lib/options').postgres
+var R = require('ramda')
 
 function connect () {
   return pgp(psqlUrl)
 }
 exports.connect = connect
 
-function loadConfig () {
+function load () {
   var db = connect()
   return db.one('select data from user_config where type=$1', 'exchanges')
   .then(function (data) {
@@ -14,4 +15,60 @@ function loadConfig () {
     return data.data
   })
 }
-exports.loadConfig = loadConfig
+
+module.exports = {
+  load,
+  unscoped,
+  cryptoScoped,
+  machineScoped,
+  scoped
+}
+
+function matchesValue (crypto, machine, instance) {
+  instance.fieldScope.crypto === crypto &&
+  instance.fieldScope.machine === machine
+}
+
+function permutations (crypto, machine) {
+  return R.uniq([
+    [crypto, machine],
+    [crypto, 'global'],
+    ['global', machine],
+    ['global', 'global']
+  ])
+}
+
+function fallbackValue (arr, instances) {
+  const crypto = arr[0]
+  const machine = arr[1]
+  const notNil = R.pipe(R.isNil, R.not)
+  const pickValue = (crypto, machine) => R.find(matchesValue, instances)
+
+  return R.find(notNil, R.map(pickValue, permutations(crypto, machine)))
+}
+
+function generalScoped (crypto, machine, config) {
+  const machineScopedCluster = fieldCluster =>
+    [fieldCluster.code, fallbackValue(crypto, machine, fieldCluster.fieldInstances)]
+
+  const scopedGroups = group =>
+    [group.code, R.fromPairs(group.fieldClusters.map(machineScopedCluster))]
+
+  return R.fromPairs(config.groups.map(scopedGroups))
+}
+
+function machineScoped (machine, config) {
+  generalScoped('global', machine, config)
+}
+
+function unscoped (config) {
+  generalScoped('global', 'global', config)
+}
+
+function cryptoScoped (crypto, config) {
+  generalScoped(crypto, 'global', config)
+}
+
+function scoped (crypto, machine, config) {
+  generalScoped(crypto, machine, config)
+}