#!/bin/bash

LOWTHRESHOLD="1.01"
HIGHTHRESHOLD="30.2"
REFRESHRATE=1

LEDCONTROLLER="/usr/bin/ledcontroller"


iostat -c "$REFRESHRATE" | while read iostatOutput; do

  iowaitPercent="$(echo "$iostatOutput" | grep -vE "Linux|avg|^$" | awk '{print $4}')"

  [ -z "$iowaitPercent" ] || \
  if (( $(bc <<< "$iowaitPercent > $LOWTHRESHOLD") == 0  )); then 

    $LEDCONTROLLER blue

  elif (( $(bc <<< "$iowaitPercent > $HIGHTHRESHOLD") == 0 )); then

    $LEDCONTROLLER green

  else

    $LEDCONTROLLER red

  fi

done


# This is an older version of the code, which used /proc/stats to do a similar job.

#iowaitCounter="$(grep 'cpu ' /proc/stat | cut -f 9 -d ' ')"
#$LEDCONTROLLER blue
#ledcolor="blue"
#
#while (true); do
#
#  iowaitTemp="$(grep 'cpu ' /proc/stat | cut -f 9 -d ' ')"
#
##  echo "iowaitCounter=$iowaitCounter, iowaitTemp=$iowaitTemp"
#
#  if (( "$iowaitCounter" == "$iowaitTemp" )); then
#
#    if [ "$ledcolor" != "blue" ]; then
#
#      $LEDCONTROLLER blue
#      ledcolor="blue"
#
#    fi
#
#  else
#
#     iowaitCounter="$iowaitTemp"
#
#     if [ "$ledcolor" != "red" ]; then
#
#       $LEDCONTROLLER red;
#       ledcolor="red"
#
#     fi
#
#  fi
#
#  sleep "$REFRESHRATE";
#
#done