Fix case for no previous bleeding day. Use new getCycleDay API

bleeding.js

@@ -11,9 +11,9 @@ import { saveBleeding } from './db'
 import { formatDateForViewHeader } from './format'
 import { bleeding as labels } from './labels'
 import cycleDayModule from './get-cycle-day-number'
-import { getCycleDaysSortedByDateView } from './db'
+import { bleedingDaysSortedByDate } from './db'
 
-const getCycleDay = cycleDayModule(getCycleDaysSortedByDateView())
+const getCycleDay = cycleDayModule(bleedingDaysSortedByDate)
 
 export default class Bleeding extends Component {
   constructor(props) {

day-view.js

@@ -8,9 +8,9 @@ import styles from './styles'
 import { formatDateForViewHeader } from './format'
 import { bleeding as labels} from './labels'
 import cycleDayModule from './get-cycle-day-number'
-import { getCycleDaysSortedByDateView } from './db'
+import { bleedingDaysSortedByDate } from './db'
 
-const getCycleDay = cycleDayModule(getCycleDaysSortedByDateView())
+const getCycleDay = cycleDayModule(bleedingDaysSortedByDate)
 
 export default class DayView extends Component {
   constructor(props) {

get-cycle-day-number.js

@@ -4,15 +4,10 @@ const LocalDate = joda.LocalDate
 
 export default function config(bleedingDaysSortedByDateView, opts) {
   opts = opts || {
-    // at the very minimum, a cycle can be a bleeding day
-    // followed by a non-bleeding day, thus a length of 2
     maxBreakInBleeding: 1
   }
 
   return function getCycleDayNumber(targetDateString) {
-    // sort the cycle days in descending order so we travel into
-    // the past as we iterate over the array
-    // also, to retrieve the number, we only need the cycle days before the target day
     const targetDate = LocalDate.parse(targetDateString)
     const withWrappedDates = bleedingDaysSortedByDateView
       .filter(day => !day.bleeding.exclude)
@@ -20,16 +15,15 @@ export default function config(bleedingDaysSortedByDateView, opts) {
         day.wrappedDate = LocalDate.parse(day.date)
         return day
       })
-    // TODO write test for what if there is no first day before?? aka no firstbleedingdaybeforeindex
+
     const firstBleedingDayBeforeTargetDayIndex = withWrappedDates.findIndex(day => day.wrappedDate.isBefore(targetDate))
-    const cycleDays = withWrappedDates.slice(firstBleedingDayBeforeTargetDayIndex)
+    if (firstBleedingDayBeforeTargetDayIndex < 0) return null
+    const previousBleedingDays = withWrappedDates.slice(firstBleedingDayBeforeTargetDayIndex)
 
-    const lastPeriodStart = cycleDays.find((day, i) => {
-      return thereIsNoPreviousBleedingDayWithinTheThreshold(day, cycleDays.slice(i + 1), opts.maxBreakInBleeding)
+    const lastPeriodStart = previousBleedingDays.find((day, i) => {
+      return thereIsNoPreviousBleedingDayWithinTheThreshold(day, previousBleedingDays.slice(i + 1), opts.maxBreakInBleeding)
     })
 
-    if (!lastPeriodStart) return null
-
     const diffInDays = lastPeriodStart.wrappedDate.until(targetDate, joda.ChronoUnit.DAYS)
 
     // cycle starts at day 1

home.js

@@ -6,22 +6,27 @@ import {
 } from 'react-native'
 import styles from './styles'
 import cycleDayModule from './get-cycle-day-number'
-import { getCycleDaysSortedByDateView, deleteAll } from './db'
+import { bleedingDaysSortedByDate, deleteAll } from './db'
 import { LocalDate } from 'js-joda'
 
-const cycleDaysSortedByDateView = getCycleDaysSortedByDateView()
-const getCycleDayNumber = cycleDayModule(cycleDaysSortedByDateView)
-const now = new Date()
-const cycleDayNumber = getCycleDayNumber(LocalDate.of(now.getFullYear(), now.getMonth() + 1, now.getDate()))
-const welcomeTextWithCycleDay = `Welcome! Today is day ${cycleDayNumber} of your current cycle`
-const welcomeText = `Welcome! We don't have enough information to know what your current cycle day is`
+const getCycleDayNumber = cycleDayModule(bleedingDaysSortedByDate)
 
 export default class Home extends Component {
   constructor(props) {
     super(props)
+    const now = new Date()
+    this.todayDateString = LocalDate.of(now.getFullYear(), now.getMonth() + 1, now.getDate()).toString()
+    const cycleDayNumber = getCycleDayNumber(this.todayDateString)
+
     this.state = {
-      welcomeText: cycleDayNumber ? welcomeTextWithCycleDay : welcomeText
+      welcomeText: determineWelcomeText(cycleDayNumber)
     }
+
+    bleedingDaysSortedByDate.addListener(setStateWithCurrentWelcomeText.bind(this))
+  }
+
+  componentWillUnmount() {
+    bleedingDaysSortedByDate.removeListener(setStateWithCurrentWelcomeText)
   }
 
   render() {
@@ -45,3 +50,13 @@ export default class Home extends Component {
     )
   }
 }
+
+function determineWelcomeText(cycleDayNumber) {
+  const welcomeTextWithCycleDay = `Welcome! Today is day ${cycleDayNumber} of your current cycle`
+  const welcomeText = `Welcome! We don't have enough information to know what your current cycle day is`
+  return cycleDayNumber ? welcomeTextWithCycleDay : welcomeText
+}
+
+function setStateWithCurrentWelcomeText() {
+  this.setState({ welcomeText: determineWelcomeText(getCycleDayNumber(this.todayDateString)) })
+}