#!/bin/sh

start ()
{
  wlsunset -l "59.8" -L "30.2" -t "3000" -T "6500" &
}

stop ()
{
  pkill -x wlsunset
}

rotate ()
{
  pkill -x -SIGUSR1 wlsunset
}

update_waybar ()
{
  pkill -x -SIGRTMIN+10 waybar
}

is_active ()
{
  pkill -x -0 wlsunset
}

has_wlsunset ()
{
  command -v wlsunset >/dev/null
}

case "$1" in
  'start')
    start
    update_waybar
    ;;
  'stop')
    stop
    update_waybar
    ;;
  'toggle')
    is_active && stop || start
    update_waybar
    ;;
  'rotate')
    rotate
    update_waybar
    ;;
  'check')
    has_wlsunset
    exit $?
    ;;
esac

if is_active; then
  alt="on"
  tooltip="Stop/rotate wlsunset"
else
  alt="off"
  tooltip="Start wlsunset"
fi

printf '{"alt":"%s","tooltip":"%s"}\n' "$alt" "$tooltip"