#!/usr/bin/env bash

# theme - change the current desktop theme (XFCE) to light, dark, or based on
#         the time of day. other programs should update automatically.
#
# usage: theme <light|dark|auto>

set -euo pipefail

LIGHT_THEME=Greybird
DARK_THEME=Greybird-dark

usage() {
	echo "usage: theme <light|dark|auto>"
	exit 1
}

set_theme() {
	xfconf-query -c xfwm4 -p /general/theme -s "$1"
	xfconf-query -c xsettings -p /Net/ThemeName -s "$1"
	gsettings set org.gnome.desktop.interface color-scheme "$2"
}

set_light_theme() {
	set_theme $LIGHT_THEME default
}

set_dark_theme() {
	set_theme $DARK_THEME prefer-dark
}

set_auto_theme() {
	current_time=$(date +"%s")
	time_for_dark=$(date -d "18:00" +"%s")
	if [ "$current_time" -gt "$time_for_dark" ]; then
		set_dark_theme
	else
		set_light_theme
	fi
}

case ${1-} in
	light) set_light_theme;;
	dark) set_dark_theme;;
	auto) set_auto_theme;;
	*) usage;;
esac