#!/bin/bash

LevelSteps=60
AnimationDelay=0.016
MaxScreenBrightness=96000
SensorDelay=1

MinimumBrightness=001

SensorToDisplayScale=24

touch '/tmp/AB.running'

until [ -f /tmp/AB.kill ]
do
	if [[ -f /tmp/AB.stop ]]
	then
		rm '/tmp/AB.stop'
		rm '/tmp/AB.running'

		until [[ -f /tmp/AB.start ]]
		do
			sleep 10
		done
		rm '/tmp/AB.start'
		touch '/tmp/AB.running'
	else
		Light=$(cat /sys/bus/iio/devices/iio\:device0/in_illuminance_raw)

		CurrentBrightness=$(cat /sys/class/backlight/intel_backlight/brightness)


		Light=$(( $Light + $MinimumBrightness ))


		TempLight=$(($Light * $SensorToDisplayScale))

		if [[ $TempLight -gt $MaxScreenBrightness ]]
		then
			NewLight=$MaxScreenBrightness
		else
			NewLight=$TempLight
		fi

		DiffCount=$(( ($NewLight - $CurrentBrightness)/$LevelSteps ))

		for i in $(eval echo {1..$LevelSteps} )
		do

			NewLight=$(( $DiffCount ))

			if [[ $NewLight -lt 0 ]]
			then
			NewLight=$( echo "$NewLight" | awk -F "-" {'print$2'})
			NewLight=$(echo $NewLight-)
			else
			NewLight=$(echo +$NewLight)
			fi

			brightnessctl -q s $NewLight
			sleep $AnimationDelay

		done

		sleep $SensorDelay
  fi

done
rm '/tmp/AutoBright.running'
rm '/tmp/AutoBright.kill'