#!/bin/sh

set -e
[ -n "$DEBUG" ] && set -x

icons=/usr/share/icons/mdi/scalable

case "${1}" in
dawn | dusk)
	touch "/tmp/darkmode.${1}"
	;;
esac

case "${1}" in
dawn | day*)
	[ -f "/tmp/darkmode.${1}" ] && exit 0
	notify-send -i ${icons}/car-light-high.svg -a gamma "gamma: ${1}" "switching to light theme"
	gsettings set org.gnome.desktop.interface gtk-theme Adwaita
	pkill -fe -USR1 waybar-gammastep
	;;

dusk | night)
	[ -f "/tmp/darkmode.${1}" ] && exit 0
	notify-send -i ${icons}/car-light-dimmed.svg -a gamma "gamma: ${1}" "switching to dark theme"
	gsettings set org.gnome.desktop.interface gtk-theme Adwaita-dark
	pkill -fe -USR2 waybar-gammastep
	;;

*)
	printf "usage: %s [night|daytime]\n" "$(basename "$(readlink -f -- "$0")")"
	;;
esac