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/notifier/index.js

@@ -143,7 +143,7 @@ async function transactionNotify (tx, rec) {
   const isCashOut = tx.direction === 'cashOut'
   
   // high value tx on database
-  if(highValueTx) {
+  if(highValueTx && tx.direction === 'cashIn' || highValueTx && tx.direction === 'cashOut' && rec.isRedemption) {
     queries.addHighValueTx(tx)
   }
   
@@ -205,10 +205,40 @@ async function sendTransactionMessage(rec, isHighValueTx) {
   return Promise.all(promises)
 }
 
+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,
   checkPings,
   checkStuckScreen,
-  sendRedemptionMessage
+  sendRedemptionMessage,
+  cashCassettesNotify
 }

lib/notifier/queries.js

@@ -2,6 +2,15 @@ const dbm = require('../postgresql_interface')
 const db = require('../db')
 const { v4: uuidv4 } = require('uuid')
 
+// types of notifications able to be inserted into db:
+/*
+highValueTransaction - for transactions of value higher than threshold
+fiatBalance - when the number of notes in cash cassettes falls below threshold
+cryptoBalance - when ammount of crypto balance in fiat falls below or above low/high threshold
+compliance - notifications related to warnings triggered by compliance settings
+error - notifications related to errors
+*/
+
 const addHighValueTx = (tx) => {
     const sql = `INSERT INTO notifications (id, type, device_id, message, created) values($1, $2, $3, $4, CURRENT_TIMESTAMP)`
     const direction = tx.direction === "cashOut" ? 'cash-out' : 'cash-in'
@@ -9,4 +18,15 @@ const addHighValueTx = (tx) => {
     return db.oneOrNone(sql, [uuidv4(), 'highValueTransaction', tx.deviceId, message])
 }
 
-module.exports = { machineEvents: dbm.machineEvents, addHighValueTx }
+const addCashCassetteWarning = (cassetteNumber, deviceId) => {
+    const sql = `INSERT INTO notifications (id, type, detail, device_id, message, created) values($1, $2, $3, $4, $5, CURRENT_TIMESTAMP)`
+    const message = `Cash-out cassette ${cassetteNumber} almost empty!`
+    return db.oneOrNone(sql, [uuidv4(), 'fiatBalance', cassetteNumber, deviceId, message])
+}
+
+const getUnreadCassetteNotifications = (cassetteNumber) => {
+    const sql = `SELECT * FROM notifications WHERE read = 'f' AND TYPE = 'fiatBalance' AND detail = '$1'`
+    return db.any(sql, [cassetteNumber])
+}
+
+module.exports = { machineEvents: dbm.machineEvents, addHighValueTx, addCashCassetteWarning, getUnreadCassetteNotifications }