#!/bin/bash

# get info from xrandr
connectedOutputs=$(xrandr | grep " connected" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
activeOutput=$(xrandr | grep -E " connected (primary )?[1-9]+" | sed -e "s/\([A-Z0-9]\+\) connected.*/\1/")
disconnectedOutputs=$(xrandr | grep -E " disconnected (primary )?[1-9]+" | awk '{print $1}')

cmd="xrandr "
cmd_def=$cmd

INTERNAL=eDP-1
HDMI=HDMI-1
VGA=VGA-1

for device in "$disconnectedOutputs"; do
	if [ -n "$defice" ]; then
		if [[ "$activeOutput" == *"$device"* ]]; then
			cmd=$cmd" --output $device --off"
		fi
	fi
done

function only_internal {
	cmd=$cmd" --output $INTERNAL --auto --primary"
	cmd=$cmd" --output $HDMI --off"
	cmd=$cmd" --output $VGA --off"
}

function internal_vga {
	cmd=$cmd" --output $INTERNAL --auto --primary"
	cmd=$cmd" --output $HDMI --off"
	cmd=$cmd" --output $VGA --auto --right-of $INTERNAL"
}

function internal_hdmi {
	cmd=$cmd" --output $INTERNAL --auto --right-of $HDMI"
	cmd=$cmd" --output $HDMI --auto --primary"
	cmd=$cmd" --output $VGA --off"
}

function internal_hdmi_vga {
	cmd=$cmd" --output $INTERNAL --auto --right-of $HDMI"
	cmd=$cmd" --output $HDMI --auto --primary"
	cmd=$cmd" --output $VGA --auto --left-of $HDMI"
}

function cmd_exec {
	if [ "$cmd" != "$cmd_def" ]; then
		echo $cmd
		`$cmd`
	fi
}


if [ $# -le 1 ]; then
	if [[ "$connectedOutputs" == *"$HDMI"* ]]; then
		if [[ "$connectedOutputs" == *"$VGA"* ]]; then
			internal_hdmi_vga
		else
			internal_hdmi
		fi
	else
		if [[ "$connectedOutputs" == *"$VGA"* ]]; then
			internal_vga
		else
			only_internal
		fi
	fi
	cmd_exec
	exit
fi

if [ "$2" != "mode" ]; then
	if [[ "$connectedOutputs" != *"$2"* ]]; then
		echo No $2 display known
		exit
	fi
fi

case "$1" in
	toggle)
		case "$2" in
			$INTERNAL)
				if [[ "$activeOutput" == *"$INTERNAL"* ]]; then
					cmd=$cmd" --output $INTERNAL --off"
				else
					if [[ "$activeOutput" == *"$HDMI"* ]]; then
						cmd=$cmd" --output $INTERNAL --auto --right-of $HDMI"
					else
						cmd=$cmd" --output $INTERNAL --auto --primary"
					fi
				fi
				;;
			$HDMI)
				if [[ "$activeOutput" == *"$HDMI"* ]]; then
					cmd=$cmd" --output $HDMI --off"
				else
					if [[ "$activeOutput" == *"$VGA"* ]]; then
						cmd=$cmd" --output $HDMI --auto --primary"
					else
						cmd=$cmd" --output $HDMI --auto --right-of $INTERNAL"
					fi
				fi
				;;
			$VGA)
				if [[ "$activeOutput" == *"$VGA"* ]]; then
					cmd=$cmd" --output $VGA --off"
				else
					if [[ "$activeOutput" == *"$HDMI"* ]]; then
						cmd=$cmd" --output $VGA --auto --left-of $HDMI"
					else
						cmd=$cmd" --output $VGA --auto --right-of $INTERNAL"
					fi
				fi
				;;
		esac
		;;
esac
cmd_exec