emelko
52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
import { LocalDate } from "js-joda"
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import apply8DayRule from './minus-8-day-rule'
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export default function(cycle, previousCycles, secondarySymptom) {
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let preOvuPhaseLength = 5
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const minus8DayRuleResult = apply8DayRule(previousCycles, secondarySymptom)
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if (minus8DayRuleResult) preOvuPhaseLength = minus8DayRuleResult
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const startDate = LocalDate.parse(cycle[0].date)
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const preOvuEndDate = startDate.plusDays(preOvuPhaseLength - 1).toString()
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const maybePreOvuDays = cycle.slice(0, preOvuPhaseLength).filter(d => {
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return d.date <= preOvuEndDate
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})
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const preOvulatoryDays = getDaysUntilFertileSecondarySymptom(maybePreOvuDays, secondarySymptom)
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// if fertile mucus or cervix occurs on the 1st cycle day, there is no pre-ovu phase
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if (!preOvulatoryDays.length) return null
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let endDate
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if (preOvulatoryDays.length === maybePreOvuDays.length) {
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endDate = preOvuEndDate
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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 getDaysUntilFertileSecondarySymptom(days, secondarySymptom = 'mucus') {
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const firstFertileSecondarySymptomDayIndex = days.findIndex(day => {
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if (secondarySymptom === 'mucus') {
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return day.mucus && day.mucus.value > 1
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} else if (secondarySymptom === 'cervix') {
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return day.cervix && day.cervix.opening > 0
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|| day.cervix && day.cervix.firmness > 0
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}
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})
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if (firstFertileSecondarySymptomDayIndex > -1) {
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return days.slice(0, firstFertileSecondarySymptomDayIndex)
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}
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return days
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}
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