Separate DayColumn components

components/chart/nfp-lines.js

@@ -0,0 +1,78 @@
+import { getCycleStatusForDay } from '../../lib/sympto-adapter'
+import { normalizeToScale } from './y-axis'
+
+export default function () {
+  let cycleStatus
+  let cycleStartDate
+  let noMoreCycles = false
+
+  function updateCurrentCycle(dateString) {
+    cycleStatus = getCycleStatusForDay(dateString)
+    if(!cycleStatus) {
+      noMoreCycles = true
+      return
+    }
+    if (cycleStatus.phases.preOvulatory) {
+      cycleStartDate = cycleStatus.phases.preOvulatory.start.date
+    } else {
+      cycleStartDate = cycleStatus.phases.periOvulatory.start.date
+    }
+  }
+
+  function dateIsInPeriOrPostPhase(dateString) {
+    return (
+      dateString >= cycleStatus.phases.periOvulatory.start.date
+    )
+  }
+
+  function precededByAnotherTempValue(dateString) {
+    return (
+      // we are only interested in days that have a preceding
+      // temp
+      Object.keys(cycleStatus.phases).some(phaseName => {
+        return cycleStatus.phases[phaseName].cycleDays.some(day => {
+          return day.temperature && day.date < dateString
+        })
+      })
+      // and also a following temp, so we don't draw the line
+      // longer than necessary
+      &&
+      cycleStatus.phases.postOvulatory.cycleDays.some(day => {
+        return day.temperature && day.date > dateString
+      })
+    )
+  }
+
+  function isInTempMeasuringPhase(cycleDay, dateString) {
+    return (
+      cycleDay && cycleDay.temperature
+      || precededByAnotherTempValue(dateString)
+    )
+  }
+
+  return function(dateString, cycleDay) {
+    const ret = {}
+    if (!cycleStatus && !noMoreCycles) updateCurrentCycle(dateString)
+    if (noMoreCycles) return ret
+
+    if (dateString < cycleStartDate) updateCurrentCycle(dateString)
+    if (noMoreCycles) return ret
+
+    const tempShift = cycleStatus.temperatureShift
+
+    if (tempShift) {
+      if (tempShift.firstHighMeasurementDay.date === dateString) {
+        ret.drawFhmLine = true
+      }
+
+      if (
+        dateIsInPeriOrPostPhase(dateString) &&
+        isInTempMeasuringPhase(cycleDay, dateString)
+      ) {
+        ret.drawLtlAt = normalizeToScale(tempShift.ltl)
+      }
+    }
+
+    return ret
+  }
+}