#!/bin/sh

WALLPAPER_PATH="$HOME/Images/Wallpaper"
INTERVAL=600

while getopts 'p::t::' OPTION; do
  case "$OPTION" in
    p)
      WALLPAPER_PATH="$OPTARG"
      ;;
    t)
      INTERVAL="$OPTARG"
      ;;
    ?)
      echo "Usage: {$0} [--path=] [--time=]"
      exit 1
      ;;
  esac
done

RUNNING_PID=-1
while true; do
  # run swaybg
  RANDOM_NUMBER=$(shuf -i 1-10 -n 1)
  if [ $RANDOM_NUMBER -le 2 ]; then
    swaybg -i "$(find "$WALLPAPER_PATH" -type f | shuf -n1)" -m fill &
  else
    swaybg -i "$(find "$WALLPAPER_PATH" -type f -not -path "*/hyper-pokemon/*" | shuf -n1)" -m fill &
  fi

  # get pid of new spawned instance
  NEW_PID=$!

  # wait until new instance of swaybg has booted up properly
  sleep 5

  # kill the previous process
  # the new swaybg process takes its place automatically
  kill $RUNNING_PID

  # set pid for next iteration
  RUNNING_PID=$NEW_PID

  # wait $INTERVAL seconds
  sleep $INTERVAL
done