#!/bin/sh

set -eu


# Loaded from ~/.config/environment.d/50-defaults.conf or a local override
BRIGHTNESS="${DEFAULT_KEYBOARD_BRIGHTNESS:?unset, check ~/.config/environment.d/}"


# Nothing to do on machines without a keyboard backlight
KBD_DEVICE=
for led in /sys/class/leds/*kbd_backlight*; do
    [ -e "$led" ] || break
    KBD_DEVICE=$led
    break
done

if [ -z "$KBD_DEVICE" ]; then
    echo "No keyboard backlight, skipping"
    exit 0
fi


kbd_set() {
    gdbus call --session \
        --dest org.gnome.SettingsDaemon.Power \
        --object-path /org/gnome/SettingsDaemon/Power \
        --method org.freedesktop.DBus.Properties.Set \
        org.gnome.SettingsDaemon.Power.Keyboard Brightness "<int32 $BRIGHTNESS>" \
        >/dev/null
}


gdbus wait --session --timeout 10 org.gnome.SettingsDaemon.Power


# `gsd-power` owns its bus name before it has probed the keyboard
# backlight, so at login the first write may silently be discarded
kbd_set

if [ "$(cat "$KBD_DEVICE/brightness")" = "0" ]; then
    sleep 3
    kbd_set
fi


echo "Set keyboard brightness to $BRIGHTNESS"