#!/bin/bash

getpids() {
  pids=( $(pgrep swaybg) )
}

killpids() {
  for i in ${pids[@]};do
    kill "${i}" && echo "killed ${i}"
  done
}

getwpno() {
  wpno_last="${wpno}"
  wpno=$(printf "%02d\n" $(($(echo "$1" | awk '{print $1}' | grep -o "^[1-9]*")-1)) | cut -c 1 | sed 's/[^0-9]*//g')
}

setbg() {
  swaybg -i "$HOME/.config/sway/assets/wallpaper/${output}/${wpno}.jpg" -o "${output}" &
}

wpno_last="9"

getpids

output=$(swaymsg -t get_outputs | jq -r '.[] | {name} | "\(.name)"')
workspace=$(swaymsg -t get_workspaces | jq -r '.[] | select(.focused) | {name} | "\(.name)"')
getwpno "${workspace}"
setbg "${output}" "${wpno}"

killpids

swaymsg -r -t subscribe -m '["workspace"]' | jq -rc --unbuffered 'select(.change == "focus") | .current | "\(.name) \(.output)"' | while read name output;do
  wsno=$(($(echo "$name" | awk '{print $1}' | grep -o "^[1-9]*")-1))
  getpids
  getwpno "${name}"

  if [[ "${wpno}" -ne "${wpno_last}" ]];then
    setbg "${output}" "${wpno}"
    killpids
  fi
done