From 4c9a70fe1c7e7596eebaf475cf78596eee614c7e Mon Sep 17 00:00:00 2001
From: Will Hawkins <whh8b@obs.cr>
Date: Mon, 13 Dec 2021 21:44:50 -0500
Subject: Intermediate check-in commit. Adding functionality and refactoring.

---
 ma/ma.go | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

(limited to 'ma')

diff --git a/ma/ma.go b/ma/ma.go
index 9d52d97..0dee17f 100644
--- a/ma/ma.go
+++ b/ma/ma.go
@@ -1,6 +1,8 @@
 package ma
 
 import (
+	"math"
+
 	"github.com/hawkinsw/goresponsiveness/saturating"
 )
 
@@ -8,25 +10,40 @@ import (
 // in Go (1.18).
 type MovingAverage struct {
 	intervals int
-	instants  []uint64
+	instants  []float64
 	index     int
 	divisor   *saturating.SaturatingInt
 }
 
 func NewMovingAverage(intervals int) *MovingAverage {
-	return &MovingAverage{instants: make([]uint64, intervals), intervals: intervals, divisor: saturating.NewSaturatingInt(intervals)}
+	return &MovingAverage{instants: make([]float64, intervals), intervals: intervals, divisor: saturating.NewSaturatingInt(intervals)}
 }
 
-func (ma *MovingAverage) AddMeasurement(measurement uint64) {
+func (ma *MovingAverage) AddMeasurement(measurement float64) {
 	ma.instants[ma.index] = measurement
 	ma.divisor.Add(1)
 	ma.index = (ma.index + 1) % ma.intervals
 }
 
 func (ma *MovingAverage) CalculateAverage() float64 {
-	total := uint64(0)
+	total := float64(0)
 	for i := 0; i < ma.intervals; i++ {
 		total += ma.instants[i]
 	}
 	return float64(total) / float64(ma.divisor.Value())
 }
+
+func (ma *MovingAverage) ConsistentWithin(limit float64) bool {
+	previous := ma.instants[0]
+	for i := 1; i < ma.intervals; i++ {
+		current := ma.instants[i]
+		delta := math.Abs(current - previous)
+		percentChange := (float64(delta) / (float64(current+previous) / 2.0)) * float64(100)
+
+		previous = current
+		if math.Abs(percentChange) > limit {
+			return false
+		}
+	}
+	return true
+}
-- 
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