#!/usr/bin/env bash
set -e

function help() {
    echo "Rotate the screen and mouse input"
    echo
    echo "Syntax: ${BINNAME} [<options>] <orientation>"
    echo "Orientation: normal,inverted,left,right"
    echo "Options:"
    echo "  -d, --disp <DISPLAY>    set for xrandr DISPLAY"
    echo "  -h, --help              this help message"
}

BINNAME="xrotate"

# Parse some args
while [[ $# -gt 0 ]]; do
    case $1 in
        -d|--disp)
            shift
            DISP=$1
            shift
            ;;
        -h|--help)
            help
            exit 0
            ;;
        *)
            if [[ $1 == '-'* ]]; then
                echo unknown option $1
                help
                exit 1
            fi
            break
            ;;
    esac
done

if [ -z "${DISP}" ]; then
    # TODO, this will break with more displays
    DISP=$(xrandr | awk -F ' ' '/ connected/ {print $1}')
fi


O=$1

MOUSE=$(xinput list | grep "slave  pointer" | awk '{print $6}' | awk -F '=' '{print $2}')

case $O in
    normal)
        echo "Normal"
        MATRIX="1 0 0 0 1 0 0 0 1"
        ;;
    inverted)
        echo "Inverted"
        MATRIX="-1 0 0 0 -1 0 0 0 1"
        ;;
    left)
        echo "Left"
        MATRIX="0 -1 0 1 0 0 0 0 1"
        ;;
    right)
        echo "Right"
        MATRIX="0 1 0 -1 0 0 0 0 1"
        ;;
    *)
        echo "Not an supported orientation"
        help
        exit 1;
        ;;
esac


set -x

xrandr --output $DISP --rotate $O
for M in $MOUSE; do
    xinput set-prop $M "Coordinate Transformation Matrix" $MATRIX
done