#!/usr/bin/env bash
# Three-state idle inhibitor for waybar (custom/inhibit):
#   off   -> normal: swayidle active, wluma adjusting brightness
#   idle  -> idle inhibited (idlehold running)
#   movie -> idle inhibited AND wluma stopped (brightness held steady)
# Usage: inhibit.sh [status|cycle]

SIGNAL=9
# idlehold: git.capella.pro/capella/idlehold (wlinhibit doesn't work on sway)
IDLEHOLD="$HOME/.local/bin/idlehold"

has_wluma() { systemctl --user cat wluma.service >/dev/null 2>&1; }
inhibiting() { pgrep -x -u "$USER" idlehold >/dev/null; }
wluma_on() { systemctl --user -q is-active wluma.service; }

state() {
    if ! inhibiting; then
        echo off
    elif has_wluma && ! wluma_on; then
        echo movie
    else
        echo idle
    fi
}

inhibit_on() { inhibiting || setsid -f "$IDLEHOLD" >/dev/null 2>&1; }
inhibit_off() { pkill -x -u "$USER" idlehold; }

case "${1:-status}" in
    cycle)
        case "$(state)" in
            off)
                inhibit_on
                ;;
            idle)
                if has_wluma; then
                    systemctl --user stop wluma.service
                else
                    inhibit_off
                fi
                ;;
            movie)
                inhibit_off
                systemctl --user start wluma.service
                ;;
        esac
        sleep 0.2
        pkill -RTMIN+$SIGNAL waybar
        ;;
    status)
        case "$(state)" in
            off)   printf '{"text":"","alt":"off","class":"off","tooltip":"Idle inhibitor: OFF"}\n' ;;
            idle)  printf '{"text":"","alt":"idle","class":"activated","tooltip":"Idle inhibitor: ON"}\n' ;;
            movie) printf '{"text":"","alt":"movie","class":"movie","tooltip":"Movie mode: idle inhibited, wluma paused"}\n' ;;
        esac
        ;;
esac