links the period reminder to bleeding days, meaning it gets updated when they change

lib/notifications.js

@@ -3,7 +3,7 @@ import Notification from 'react-native-push-notification'
 import { LocalDate } from 'js-joda'
 import Moment from 'moment'
 import { settings as labels } from '../components/labels'
-import { getOrCreateCycleDay } from '../db'
+import { getOrCreateCycleDay, getBleedingDaysSortedByDate } from '../db'
 import cycleModule from './cycle'
 
 export default function setupNotifications(navigate) {
@@ -44,26 +44,34 @@ export default function setupNotifications(navigate) {
 
   periodReminderObservable(reminder => {
     Notification.cancelLocalNotifications({id: '2'})
-    if (reminder.enabled) {
-      const bleedingPrediction = cycleModule().getPredictedMenses()
-      if (bleedingPrediction.length > 0) {
-        const bleedingStart = Moment(bleedingPrediction[0][0], "YYYY-MM-DD")
-        // 3 days before and at 6 am
-        const reminderDate = bleedingStart
-          .subtract(3, 'days')
-          .hours(6)
-          .minutes(0)
-          .seconds(0)
-        // period is likely to start in 3 to 3 + (length of prediction - 1) days
-        const daysToEndOfPrediction = bleedingPrediction[0].length + 2
-
-        Notification.localNotificationSchedule({
-          id: '2',
-          message: labels.periodReminder.notification(daysToEndOfPrediction),
-          date: reminderDate.toDate(),
-          vibrate: false
-        })
-      }
-    }
+    if (reminder.enabled) setupPeriodReminder()
   })
+
+  getBleedingDaysSortedByDate().addListener(() => {
+    Notification.cancelLocalNotifications({id: '2'})
+    if (periodReminderObservable.value.enabled) setupPeriodReminder()
+  })
+
+}
+
+function setupPeriodReminder() {
+  const bleedingPrediction = cycleModule().getPredictedMenses()
+  if (bleedingPrediction.length > 0) {
+    const bleedingStart = Moment(bleedingPrediction[0][0], "YYYY-MM-DD")
+    // 3 days before and at 6 am
+    const reminderDate = bleedingStart
+      .subtract(3, 'days')
+      .hours(6)
+      .minutes(0)
+      .seconds(0)
+    // period is likely to start in 3 to 3 + (length of prediction - 1) days
+    const daysToEndOfPrediction = bleedingPrediction[0].length + 2
+
+    Notification.localNotificationSchedule({
+      id: '2',
+      message: labels.periodReminder.notification(daysToEndOfPrediction),
+      date: reminderDate.toDate(),
+      vibrate: false
+    })
+  }
 }