Feat: save cash balance notifications in DB

Feat: add "detail" row in notifications table migration

This makes searching for specific notifications in the
code like cashbox number easier because we don't need
to scrub the notification message column anymore to search
for notifications relating the cashbox 1 for example.

Feat: clear notifications on cash cassette balance update

lib/cash-out/cash-out-atomic.js

@@ -9,6 +9,8 @@ const helper = require('./cash-out-helper')
 const cashOutActions = require('./cash-out-actions')
 const cashOutLow = require('./cash-out-low')
 
+const notifier = require("../notifier/index")
+
 const toObj = helper.toObj
 
 module.exports = {atomic}
@@ -122,8 +124,10 @@ function updateCassettes (t, tx) {
     tx.deviceId
   ]
 
-  return t.one(sql, values)
+  return t.one(sql, values).then(r => {
-    .then(r => socket.emit(_.assign(r, {op: 'cassetteUpdate', deviceId: tx.deviceId})))
+    notifier.cashCassettesNotify(r, tx.deviceId)
+    return socket.emit(_.assign(r, {op: 'cassetteUpdate', deviceId: tx.deviceId}))
+  })
 }
 
 function wasJustAuthorized (oldTx, newTx, isZeroConf) {

lib/notifier/index.js

@@ -356,6 +356,35 @@ const customerComplianceNotify = (customer, deviceId, code, days = null) => {
     .catch(console.error)
 }
 
+const cashCassettesNotify = (cassettes, deviceId) => {
+  settingsLoader.loadLatest()
+  .then(settings =>
+    [
+      configManager.getNotifications(null, deviceId, settings.config),
+      configManager.getCashOut(deviceId,settings.config).active
+    ])
+  .then(([notifications, cashOutEnabled]) => {
+    const cassette1Count = cassettes.cassette1
+    const cassette2Count = cassettes.cassette2
+    const cassette1Threshold = notifications.fiatBalanceCassette1
+    const cassette2Threshold = notifications.fiatBalanceCassette2
+
+    if(cashOutEnabled) {
+      // we only want to add this notification if there isn't one already set and unread in the database
+      Promise.all([queries.getUnreadCassetteNotifications(1), queries.getUnreadCassetteNotifications(2)]).then(res => {
+        if(res[0].length === 0 && cassette1Count < cassette1Threshold) {
+          console.log("Adding fiatBalance alert for cashbox 1 in database - count & threshold: ", cassette1Count, cassette1Threshold )
+          queries.addCashCassetteWarning(1, deviceId)
+        }
+        if(res[1].length === 0 && cassette2Count < cassette2Threshold) {
+          console.log("Adding fiatBalance alert for cashbox 2 in database - count & threshold: ", cassette2Count, cassette2Threshold )
+          queries.addCashCassetteWarning(2, deviceId)
+        }
+      })
+    }
+  })
+}
+
 module.exports = {
   transactionNotify,
   checkNotification,