Julia Friesel
32 lines
904 B
JavaScript
32 lines
904 B
JavaScript
import { LocalDate } from "js-joda"
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export default function(cycle) {
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const startDate = LocalDate.parse(cycle[0].date)
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const fiveDayEndDate = startDate.plusDays(4).toString()
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const fiveDayRuleDays = cycle.slice(0, 5).filter(d => d.date <= fiveDayEndDate)
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const preOvulatoryDays = getDaysUntilFertileMucus(fiveDayRuleDays)
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let endDate
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if (preOvulatoryDays.length === fiveDayRuleDays.length) {
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endDate = fiveDayEndDate
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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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} |