#!/bin/bash
#January 2015
#path="/sys/bus/iio/devices/iio:device0" #Path is not fixed! So use workaround below, which is correct
path="/sys/devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4:1.0/*0483:91D1*/HID-SENSOR-200073.1.auto/iio:device?"
margin=500000
current_case=0
counter=0
num_iterations=2

function increase_counter
{
    c=$1
    if [[ $c -eq $current_case ]]; then
        counter=$((counter + 1))
    else
        current_case=$c
        counter=1
    fi
}

sleep 1

while true; do

  y=`cat $path/in_accel_y_raw`
  z=`cat $path/in_accel_z_raw`
  x=`cat $path/in_accel_x_raw`

#   echo $x $y $z

if [[ $x -gt -$margin ]] && [[ $x -lt $margin ]]; then
    if [[ "$y" -gt "$margin" ]]; then
        increase_counter 2
        if [[ $counter -gt $num_iterations ]]; then
            xrandr -o inverted
            xinput set-prop 'ELAN Touchscreen' 'Coordinate Transformation Matrix' -1 0 1 0 -1 1 0 0 1
        fi
    elif [[ "$y" -lt "-$margin" ]]; then
        increase_counter 0
        if [[ $counter -gt $num_iterations ]]; then
            xrandr -o normal
            xinput set-prop 'ELAN Touchscreen' 'Coordinate Transformation Matrix' 1 0 0 0 1 0 0 0 1
        fi
    # else, x e y intorno a 0, quindi lascia l'orientazione corrente
    fi
elif [[ "$x" -gt "0" ]]; then
    increase_counter 3
    if [[ $counter -gt $num_iterations ]]; then
        xrandr -o left
        xinput set-prop 'ELAN Touchscreen' 'Coordinate Transformation Matrix' 0 -1 1 1 0 0 0 0 1
    fi
else
    increase_counter 1
    if [[ $counter -gt $num_iterations ]]; then
        xrandr -o right
        xinput set-prop 'ELAN Touchscreen' 'Coordinate Transformation Matrix' 0 1 0 -1 0 1 0 0 1
    fi
fi

  sleep 0.02
done