#!bash
# This script rotates the screen and touchscreen input 90 degrees each time it is called,
# also disables the touchpad, and enables the virtual keyboard accordingly

# by Ruben Barkow: https://gist.github.com/rubo77/daa262e0229f6e398766

#### configuration
# find your Touchscreen and Touchpad device with `xinput`
TouchscreenDevice='silead_ts'
TouchpadDevice='SIPODEV USB Composite Device Mouse'

# if [ "$1" = "--help"  ] || [ "$1" = "-h"  ] ; then
#    echo 'Usage: rotate-screen.sh [OPTION]'
#    echo
#    echo 'This script rotates the screen and touchscreen input 90 degrees each time it is called,'
#    echo 'also disables the touchpad, and enables the virtual keyboard accordingly'
#    echo
#    echo Usage:
#    echo ' -h --help display this help'
#    echo ' -j (just horizontal) rotates the screen and touchscreen input only 180 degrees'
#    echo ' -n always rotates the screen back to normal'
#    exit 0
# fi

touchpadEnabled=$(xinput --list-props "$TouchpadDevice" | awk '/Device Enabled/{print $NF}')
screenMatrix=$(xinput --list-props "$TouchscreenDevice" | awk '/Coordinate Transformation Matrix/{print $5$6$7$8$9$10$11$12$NF}')

# Matrix for rotation
# ⎡ 1 0 0 ⎤
# ⎜ 0 1 0 ⎥
# ⎣ 0 0 1 ⎦
normal='1 0 0 0 1 0 0 0 1'
normal_float='1.000000,0.000000,0.000000,0.000000,1.000000,0.000000,0.000000,0.000000,1.000000'

#⎡ -1  0 1 ⎤
#⎜  0 -1 1 ⎥
#⎣  0  0 1 ⎦
inverted='-1 0 1 0 -1 1 0 0 1'
inverted_float='-1.000000,0.000000,1.000000,0.000000,-1.000000,1.000000,0.000000,0.000000,1.000000'

# 90° to the left
# ⎡ 0 -1 1 ⎤
# ⎜ 1  0 0 ⎥
# ⎣ 0  0 1 ⎦
left='0 -1 1 1 0 0 0 0 1'
left_float='0.000000,-1.000000,1.000000,1.000000,0.000000,0.000000,0.000000,0.000000,1.000000'

# 90° to the right
#⎡  0 1 0 ⎤
#⎜ -1 0 1 ⎥
#⎣  0 0 1 ⎦
right='0 1 0 -1 0 1 0 0 1'

rotation_positions=([0]='normal' [1]='right' [2]='inverted' [3]='left')
rotation_offset=3

function rotate_touch_screen()
{
    angle=$1
    index_for_angle=$((angle/90))
    xinput set-prop "$TouchscreenDevice" 'Coordinate Transformation Matrix' ${!rotation_positions[(rotation_offset+index_for_angle)%4]}
}

function do_rotate
{

    TRANSFORM='Coordinate Transformation Matrix'

    # monitor-sensor \
    #     | grep --line-buffered "Accelerometer orientation changed" \
    #     | grep --line-buffered -o ": .*" \
    #     | while read -r line; do

    monitor-sensor \
        | grep --line-buffered -o ": .*" \
        | while read -r line; do
        line="${line#??}"
        line="${line//)}"

        if [ "$line" = "normal" ]; then
            echo "Back to normal"
            xrandr -o normal
            rotate_touch_screen 0
            xinput enable "$TouchpadDevice"
            echo killall onboard
        elif [ "$line" = "left-up" ]; then
            echo "90° to the left"
            xrandr -o left
            rotate_touch_screen 270
            echo xinput disable "$TouchpadDevice"
            #killall onboard
        elif [ "$line" = "right-up" ]; then
            echo "90° to the right"
            xrandr -o right
            rotate_touch_screen 90
            echo xinput disable "$TouchpadDevice"
            #killall onboard
        elif [ "$line" = "bottom-up" ]; then
            echo "Upside down"
            xrandr -o inverted
            rotate_touch_screen 180
            echo xinput disable "$TouchpadDevice"
            # Remove hashtag below if you want pop-up the virtual keyboard
            onboard &
        else
            echo "Unknown rotation: $line"
            continue
        fi

    done


}

do_rotate
k