Get previous cycles before detecting fertility status

lib/cycle.js

@@ -1,4 +1,5 @@
 import * as joda from 'js-joda'
+
 const LocalDate = joda.LocalDate
 
 export default function config(opts) {
@@ -49,14 +50,16 @@ export default function config(opts) {
       return !previousBleedingDays.some(({ wrappedDate }) => wrappedDate.equals(periodThreshold) || wrappedDate.isAfter(periodThreshold))
     }
 
+    withWrappedDates.forEach(day => delete day.wrappedDate)
     return lastPeriodStart
   }
 
   function getCycleDayNumber(targetDateString) {
     const lastMensesStart = getLastMensesStart(targetDateString)
     if (!lastMensesStart) return null
-    const targetDate = joda.LocalDate.parse(targetDateString)
-    const diffInDays = lastMensesStart.wrappedDate.until(targetDate, joda.ChronoUnit.DAYS)
+    const targetDate = LocalDate.parse(targetDateString)
+    const lastMensesLocalDate = LocalDate.parse(lastMensesStart.date)
+    const diffInDays = lastMensesLocalDate.until(targetDate, joda.ChronoUnit.DAYS)
 
     // cycle starts at day 1
     return diffInDays + 1
@@ -73,15 +76,36 @@ export default function config(opts) {
 
   function getCycleDaysBeforeDay(targetDateString) {
     const firstCycleDay = getLastMensesStart(targetDateString)
+    if (!firstCycleDay) return null
     return cycleDaysSortedByDate.filter(({date}) => {
       return date >= firstCycleDay.date && date <= targetDateString
     })
   }
 
+  function getPreviousCycles(targetCycleStartDay) {
+    let previousCycleStartIndex = cycleDaysSortedByDate.indexOf(targetCycleStartDay)
+    const cycles = []
+    while (previousCycleStartIndex < cycleDaysSortedByDate.length - 1) {
+      const prevDate = cycleDaysSortedByDate[previousCycleStartIndex + 1].date
+      const cycleStart = getLastMensesStart(prevDate)
+
+      if (!cycleStart) break
+
+      const cycleStartIndex = cycleDaysSortedByDate.indexOf(cycleStart)
+      const lastDayInCycle = previousCycleStartIndex + 1
+      const cycle = cycleDaysSortedByDate.slice(lastDayInCycle, cycleStartIndex + 1)
+      cycles.push(cycle)
+      previousCycleStartIndex = cycleStartIndex
+    }
+
+    return cycles
+  }
+
   return {
     getCycleDayNumber,
     getLastMensesStart,
     getPreviousTemperaturesInCycle,
-    getCycleDaysBeforeDay
+    getCycleDaysBeforeDay,
+    getPreviousCycles
   }
 }