Julia Friesel
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
export default function (cycleDays, tempEvalEndIndex) {
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const notDetected = { detected: false}
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const mucusDays = cycleDays.filter(day => day.mucus && !day.mucus.exclude)
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let currentBestQuality = 0
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for (let i = 0; i < mucusDays.length; i++) {
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const day = mucusDays[i]
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if (day.mucus.value > currentBestQuality) {
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currentBestQuality = day.mucus.value
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}
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// if mucus only changes from dry to nothing, it doesn't constitute a shift
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if (currentBestQuality < 2) continue
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if (day.mucus.value !== currentBestQuality) continue
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// the three following days must be of lower quality
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const threeFollowingDays = mucusDays.slice(i + 1, i + 4)
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if (threeFollowingDays.length < 3) continue
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const bestQualityOccursIn3FollowingDays = threeFollowingDays.some(day => {
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return day.mucus.value >= currentBestQuality
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})
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if (bestQualityOccursIn3FollowingDays) 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 mucus shift
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if (cycleDayIndex > tempEvalEndIndex) return notDetected
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// no best quality day 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.mucus && !day.mucus.exclude)
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const noBestQualityUntilEndOfTempEval = relevantDays.every(day => {
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return day.mucus.value < currentBestQuality
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})
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if (noBestQualityUntilEndOfTempEval) {
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return {
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detected: true,
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mucusPeak: 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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