#!/usr/bin/env bash
set -euo pipefail
SIG=8

get_waybar_pid() { pgrep -u "$USER" -x waybar | head -n1 || true; }
log() { echo "[waybar-audio-bridge] $*" >&2; }

WAYBAR_PID=""
while [[ -z "$WAYBAR_PID" ]]; do
  WAYBAR_PID="$(get_waybar_pid)"
  sleep 1
done
log "connected to Waybar PID $WAYBAR_PID"

# read pw-mon output, but only care about Audio nodes
pw-mon 2>/dev/null | grep --line-buffered -E "Audio|Sink|Source|Stream|Node" | while read -r _; do
  # small debounce to avoid spamming CPU when multiple updates arrive fast
  sleep 0.2
  if ! kill -0 "$WAYBAR_PID" 2>/dev/null; then
    WAYBAR_PID="$(get_waybar_pid)"
    [[ -z "$WAYBAR_PID" ]] && continue
    log "reconnected to Waybar PID $WAYBAR_PID"
  fi
  kill -RTMIN+"$SIG" "$WAYBAR_PID" 2>/dev/null || true
done