Julia Friesel
41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
import { LocalDate } from "js-joda"
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export default function(cycle, previousCycles) {
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// TODO handle no previous cycles
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let preOvuPhaseLength = 5
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//TODO make sure it handles weird cases like fhm < 9
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const minus8DayRuleResult = apply8DayRule(previousCycles)
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if (minus8DayRuleResult) preOvuPhaseLength = minus8DayRuleResult
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const startDate = LocalDate.parse(cycle[0].date)
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const preOvuPhaseEndDate = startDate.plusDays(preOvuPhaseLength - 1).toString()
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const maybePreOvuDays = cycle.slice(0, 5).filter(d => d.date <= preOvuPhaseEndDate)
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const preOvulatoryDays = getDaysUntilFertileMucus(maybePreOvuDays)
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let endDate
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if (preOvulatoryDays.length === maybePreOvuDays.length) {
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endDate = preOvuPhaseEndDate
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} else {
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endDate = preOvulatoryDays[preOvulatoryDays.length - 1].date
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}
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return {
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cycleDays: preOvulatoryDays,
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start: {
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date: preOvulatoryDays[0].date
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},
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end: {
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date: endDate
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}
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}
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}
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function getDaysUntilFertileMucus(days) {
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const firstFertileMucusDayIndex = days.findIndex(day => day.mucus && day.mucus.value > 1)
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if (firstFertileMucusDayIndex > -1) {
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return days.slice(0, firstFertileMucusDayIndex)
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}
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return days
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}
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function apply8DayRule(previousCycles) {} |