Implement second exception rule

lib/sensiplan.js

@@ -42,6 +42,7 @@ function detectTemperatureShift(temperaturesOfCycle) {
 }
 
 function rounded(val, step) {
+  // we round the difference because of JS decimal weirdness
   const inverted = 1 / step
   return Math.round(val * inverted) / inverted
 }
@@ -73,6 +74,16 @@ function checkIfFirstHighMeasurement(temp, i, temps, ltl) {
     }
   }
 
+  if (secondExceptionRuleApplies(temp, nextTemps, ltl)) {
+    return {
+      isFirstHighMeasurement: true,
+      rules: {
+        secondException: true,
+      },
+      ltl
+    }
+  }
+
   return {
     isFirstHighMeasurement: false
   }
@@ -81,18 +92,37 @@ function checkIfFirstHighMeasurement(temp, i, temps, ltl) {
 function regularRuleApplies(temp, nextTemps, ltl) {
   if (!nextTemps.every(temp => temp > ltl)) return false
   const thirdTemp = nextTemps[1]
-  // we round the difference because of JS decimal weirdness
   if (rounded(thirdTemp - ltl, 0.1) < 0.2) return false
   return true
 }
 
 function firstExceptionRuleApplies(temp, nextTemps, ltl) {
+  if (nextTemps.length < 3) return false
   if (!nextTemps.every(temp => temp > ltl)) return false
   const fourthTemp = nextTemps[2]
   if (fourthTemp > ltl) return true
   return false
 }
 
+function secondExceptionRuleApplies(temp, nextTemps, ltl) {
+  if (nextTemps.length < 3) return false
+  if (secondOrThirdTempIsAtOrBelowLtl(nextTemps, ltl)) {
+    const fourthTemp = nextTemps[2]
+    if (rounded(fourthTemp - ltl, 0.1) >= 0.2) return true
+  }
+  return false
+}
+
+function secondOrThirdTempIsAtOrBelowLtl(nextTemps, ltl) {
+  const secondIsLow = nextTemps[0] <= ltl
+  const thirdIsLow = nextTemps[1] <= ltl
+  if ((secondIsLow || thirdIsLow) && !(secondIsLow && thirdIsLow)) {
+    return true
+  } else {
+    return false
+  }
+}
+
 export {
   detectTemperatureShift
 }
\ No newline at end of file

test/sensiplan.spec.js

@@ -82,6 +82,12 @@ describe.only('sensiplan', () => {
         expect(status).to.eql({ detected: false })
       })
 
+      it('detects missing temperature shift with not enough high temps', function () {
+        const temps = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.77]
+        const status = detectTemperatureShift(temps)
+        expect(status).to.eql({ detected: false })
+      })
+
       it('detects shift after an earlier one was invalid', function () {
         const temps = [36.4, 36.4, 36.4, 36.4, 36.4, 36.4, 36.6, 36.6, 36.4, 36.4, 36.7, 36.7, 36.7, 36.7]
 
@@ -95,5 +101,55 @@ describe.only('sensiplan', () => {
         })
       })
     })
+
+    describe('2nd exception rule', () => {
+      it('detects temperature shift with exception temp eql ltl', function () {
+        const secondException = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.6, 36.8]
+        const status = detectTemperatureShift(secondException)
+        expect(status).to.eql({
+          low: [36.55, 36.45, 36.5, 36.55, 36.6, 36.55],
+          ltl: 36.6,
+          high: [36.8, 36.85, 36.6, 36.8],
+          detected: true,
+          rules: { secondException: true }
+        })
+      })
+
+      it('detects temperature shift with exception temp lower than ltl', function () {
+        const secondException = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4, 36.8]
+        const status = detectTemperatureShift(secondException)
+        expect(status).to.eql({
+          low: [36.55, 36.45, 36.5, 36.55, 36.6, 36.55],
+          ltl: 36.6,
+          high: [36.8, 36.85, 36.4, 36.8],
+          detected: true,
+          rules: { secondException: true }
+        })
+      })
+
+      it('detects missing temperature shift correctly', function () {
+        const temps = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4, 36.77, 36.77]
+        const status = detectTemperatureShift(temps)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects missing temperature shift when not enough high temps', function () {
+        const temps = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4]
+        const status = detectTemperatureShift(temps)
+        expect(status).to.eql({ detected: false })
+      })
+
+      it('detects shift after an earlier one was invalid', function () {
+        const temps = [36.7, 36.57, 36.47, 36.49, 36.57, 36.62, 36.55, 36.8, 36.86, 36.4, 36.77, 36.9, 36.9, 36.86, 37.04]
+        const status = detectTemperatureShift(temps)
+        expect(status).to.eql({
+          low: [36.6, 36.55, 36.8, 36.85, 36.4, 36.75],
+          ltl: 36.85,
+          high: [36.9, 36.9, 36.85, 37.05],
+          detected: true,
+          rules: { secondException: true }
+        })
+      })
+    })
   })
 })
\ No newline at end of file