#!/usr/bin/env bash

# shellcheck source=/dev/null
source "$(dirname "$0")"/utils

volicons=("" "" "")
date="$XDG_CACHE_HOME/eww/osd_vol.date"

vol() {
  wpctl get-volume @DEFAULT_AUDIO_"$1"@ | awk '{print int($2*100)}'
}
ismuted() {
  wpctl get-volume @DEFAULT_AUDIO_"$1"@ | rg -qi muted
  echo -n $?
}
setvol() {
  wpctl set-volume @DEFAULT_AUDIO_"$1"@ "$(awk -v n="$2" 'BEGIN{print (n / 100)}')"
}
setmute() {
  wpctl set-mute @DEFAULT_AUDIO_"$1"@ toggle
}

gen_output() {
  percent="$(vol "SINK")"
  if [[ "$event" == *source* ]]; then
    pactl list sources | rg -q RUNNING
    [ $? -eq 1 ] && in_use=0 || in_use=1
  else
    lvl=$(awk -v n="$percent" 'BEGIN{print int(n/34)}')
    ismuted=$(ismuted "SINK")

    if [ "$ismuted" = 1 ]; then
      icon="${volicons[$lvl]}"
    else
      icon=""
    fi
  fi

  echo '{"icon": "'"$icon"'", "percent": "'"$percent"'", "microphone": "'"$(vol "SOURCE")"'", "in_use": "'"$in_use"'"}'
}

case "$1" in
"mute")
  if [ "$2" != "SOURCE" ] && [ "$2" != "SINK" ]; then
    echo "Can only mute SINK or SOURCE"
    exit 1
  fi
  setmute "$2"
  ;;

"setvol")
  if [ "$2" != "SOURCE" ] && [ "$2" != "SINK" ]; then
    echo "Can only set volume for SINK or SOURCE"
    exit 1
  elif [ "$3" -lt 0 ] || [ "$3" -gt 100 ]; then
    echo "Volume must be between 0 and 100"
    exit 1
  fi
  setvol "$2" "$3"
  ;;

"osd")
  osd "$date"
  ;;

"")
  # initial values
  in_use=0
  last_time=$(get_time_ms)
  gen_output
  osd_handler "osd-volume" &

  # event loop
  pactl subscribe | rg --line-buffered ".*(source|sink).*" | while read -r event; do
    current_time=$(get_time_ms)
    delta=$((current_time - last_time))
    # 50ms debounce
    if [[ $delta -gt 50 ]]; then
      gen_output
      # reset debounce timer
      last_time=$(get_time_ms)
    fi
  done
  ;;

*) echo "wrong usage" ;;
esac