#!/bin/bash

CAMERA=/dev/video0
SCREEN=/sys/class/backlight/intel_backlight/brightness
MAX=$(cat /sys/class/backlight/intel_backlight/max_brightness)
WD=/home/thepasto/Scripts/autobrightness

CAPTURE=$WD/autobrightness.jpg
INTERVAL=600


function getBright(){
    while true
    do
        rm -f $CAPTURE
        gst-launch-1.0 v4l2src num-buffers=1 ! jpegenc ! filesink location=$CAPTURE > /dev/null
        sleep 2
        hsb=$(convert $CAPTURE -colorspace hsb  -resize 1x1  txt:- | tail -n1 | awk '{print $2}')
        hsb=$(echo $hsb | sed 's/(//g')
        hsb=$(echo $hsb | sed 's/)//g')
        h=$(echo $hsb | cut -f 1 -d',' | sed 's/%//g')
        s=$(echo $hsb | cut -f 2 -d',' | sed 's/%//g')
        b=$(echo $hsb | cut -f 3 -d',' | sed 's/%//g')

        bres=$(echo "($MAX*$b)/100" | bc)
        sleep $INTERVAL
    done

}

function runningInst (){
    ABPID=$(ps ax | grep "autobrightness.sh start" | grep -v "grep" | awk '{print $1}')
}




case "$1" in
    start)
        echo -en "Starting $0 \t"
        getBright &
        if [ $? == 0 ];then
            echo "[OK]"
        else
            echo "[FAIL]"
        fi
        echo ""
        exit 0
    ;;

    stop)
        echo -en "Stopping $0 \t"
        runningInst
        kill -s 9 $ABPID &> /dev/null
        if [ $? == 0 ];then
            echo "[OK]"
        else
            echo "[FAIL]"
        fi
        exit 0
    ;;

    restart)
        sh $0 stop
        sh $0 start
    ;;

    *)
        echo "Utilizzo: $0 {start|stop|restart}" >&2
        exit 1
    ;;

esac

exit 0



getBright