#!/bin/sh

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

icon=$(iconez -n weather-sunset)

trap '{ notify-send -c error -i "$icon" -a darkmode "darkmode" "switching failed!"; }' ERR

gui__dark() {
	gsettings set org.gnome.desktop.interface gtk-theme Adwaita
	# gsettings set org.gnome.desktop.interface gtk-theme Adwaita-dark
	gsettings set org.gnome.desktop.interface color-scheme prefer-dark
}
gui__light() {
	gsettings set org.gnome.desktop.interface gtk-theme Adwaita
	gsettings set org.gnome.desktop.interface color-scheme prefer-light
}

term__apply_theme() {
	# stolen from https://github.com/lemnos/theme.sh/blob/master/bin/theme.sh
	awk '
	BEGIN {
		fgesc="\033]10;#%s\007"
		bgesc="\033]11;#%s\007"
		curesc="\033]12;#%s\007"
		colesc="\033]4;%d;#%s\007"
	}
	/^foreground:/ { printf fgesc, substr($2, 2) > "/dev/tty" }
	/^background:/ { printf bgesc, substr($2, 2) > "/dev/tty" }
	/^cursor:/ { printf curesc, substr($2, 2) > "/dev/tty" }
	/^[0-9]+:/ { printf colesc, $1, substr($2, 2) > "/dev/tty" }
'
}
term__dark() {
	term__apply_theme <"$XDG_CONFIG_HOME"/darkmode/night
}
term__light() {
	term__apply_theme <"$XDG_CONFIG_HOME"/darkmode/day
}

# debounce dawn/dusk phasing
marker="/tmp/darkmode_transition"
case "${1}" in
dawn | dusk)
	[ ! -f $marker ] && touch "$marker"
	;;
day* | night)
	[ -f $marker ] && rm -f "$marker"
	;;
esac

# showtime...
case "${1}" in
dawn | day*)
	[ -f $marker ] && exit 0
	notify-send -i "${icon}" -a darkmode "darkmode" "switching to <i>${1}</i>"
	gui__light
	# term__light
	# pkill -fe -USR1 waybar-gammastep
	;;

dusk | night)
	[ -f $marker ] && exit 0
	notify-send -i "${icon}" -a darkmode "darkmode" "switching to <i>${1}</i>"
	gui__dark
	# term__dark
	# pkill -fe -USR2 waybar-gammastep
	;;

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