Julia Friesel
58 lines
2.1 KiB
JavaScript
58 lines
2.1 KiB
JavaScript
export default function (cycleDays, tempEvalEndIndex) {
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const notDetected = { detected: false }
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const cervixDays = cycleDays
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.filter(day => day.cervix && !day.cervix.exclude)
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.filter(day => typeof day.cervix.opening === 'number' && typeof day.cervix.firmness === 'number')
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// we search for the day of cervix peak, which must:
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// * have fertile cervix values
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// * be followed by at least 3 days
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// these 3 following days must all show infertile cervix values
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// if everything applies we must check the days until the end of temperature evaluation
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// during these relevantDays no fertile cervix must occur
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for (let i = 0; i < cervixDays.length; i++) {
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const day = cervixDays[i]
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if (isClosedAndHard(day.cervix)) continue
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// the three following days must be with closed and hard cervix (indicating an infertile cervix)
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const threeFollowingDays = cervixDays.slice(i + 1, i + 4)
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if (threeFollowingDays.length < 3) continue
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const fertileCervixOccursIn3FollowingDays = threeFollowingDays.some(day => {
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return !isClosedAndHard(day.cervix)
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})
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if (fertileCervixOccursIn3FollowingDays) continue
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const cycleDayIndex = cycleDays.indexOf(day)
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// if temperature evaluation has been completed an we still haven't found
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// a candidate, there is no cervix shift
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if (cycleDayIndex > tempEvalEndIndex) return notDetected
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// no other fertile cervix value may occur until temperature evaluation has
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// been completed
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const relevantDays = cycleDays
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.slice(cycleDayIndex + 1, tempEvalEndIndex + 1)
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.filter(day => day.cervix && !day.cervix.exclude)
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const onlyClosedAndHardUntilEndOfTempEval = relevantDays.every(day => {
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return isClosedAndHard(day.cervix)
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})
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if (onlyClosedAndHardUntilEndOfTempEval) {
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return {
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detected: true,
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cervixPeakBeforeShift: day,
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evaluationCompleteDay: threeFollowingDays[threeFollowingDays.length - 1]
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}
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}
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}
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return notDetected
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}
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function isClosedAndHard (cervixDay) {
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return cervixDay.opening === 0 && cervixDay.firmness === 0
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}
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