Return evaluation completed day from mucus eval

lib/sympto/mucus.js

@@ -2,31 +2,37 @@ export default function (cycleDays, tempEvalEndIndex) {
   const mucusDays = cycleDays.filter(day => day.mucus && !day.mucus.exclude)
   const bestQuality = Math.max(...mucusDays.map(day => day.mucus.value))
 
-  const mucusPeak = cycleDays.find((day, i) => {
-    if (!mucusDays.includes(day) || day.mucus.value !== bestQuality) return false
+  for (let i = 0; i < mucusDays.length; i++) {
+    const day = mucusDays[i]
+    if (day.mucus.value !== bestQuality) continue
 
     // sensiplan says the three following days must be of lower quality
     // AND no best quality day may occur until temperature evaluation has
     // been completed
-    const mucusDaysIndex = mucusDays.indexOf(day)
-    const threeFollowingDays = mucusDays.slice(mucusDaysIndex + 1, mucusDaysIndex + 4)
-    if (threeFollowingDays.length < 3) return false
+    const threeFollowingDays = mucusDays.slice(i + 1, i + 4)
+    if (threeFollowingDays.length < 3) continue
 
     const bestQualityOccurringIn3FollowingDays = threeFollowingDays.some(day => day.mucus.value >= bestQuality)
-    if (bestQualityOccurringIn3FollowingDays) return false
+    if (bestQualityOccurringIn3FollowingDays) continue
 
+    // FIXME mucus peak can be same day as first higher measurement
+    const cycleDayIndex = cycleDays.indexOf(day)
     const relevantDays = cycleDays
-      .slice(i + 1, tempEvalEndIndex + 1)
+      .slice(cycleDayIndex + 1, tempEvalEndIndex + 1)
       .filter(day => day.mucus && !day.mucus.exclude)
 
-    return relevantDays.every(day => day.mucus.value < bestQuality)
-  })
+    const evaluationCompleteDay = relevantDays.length > 3 ?
+      relevantDays[relevantDays.length - 1] : threeFollowingDays[threeFollowingDays.length - 1]
 
-  if (!mucusPeak) return { detected: false }
-
-  return {
-    detected: true,
-    mucusPeak
+    if (relevantDays.every(day => day.mucus.value < bestQuality)) {
+      return {
+        detected: true,
+        mucusPeak: day,
+        evaluationCompleteDay
+      }
+    }
   }
+
+  return { detected: false }
 }