#!/usr/bin/env nu

let today = (date now | format date '%Y-%m-%d')
let pic_dir = (xdg-user-dir PICTURES)
let bg_dir = $pic_dir | path join "bg"
let today_img_file = $bg_dir | path join ( [ $today, ".png" ] | str join )
let is_new = ((date now | format date "%H" | into int) >= 10)
mkdir $bg_dir

def exists [file: path] {
  return ($file | path exists)
}

def is_empty [file: path] {
  return ((exists $file) and ((ls $file | get size | first | into int) == 0))
}

def fetch [] {
  http get ("https://bing.com" + ((http get https://www.bing.com/HPImageArchive.aspx?format=js&n=1).images.0.url)) | save $today_img_file
}

def cleanup [] {
  if (is_empty $today_img_file) {
    rm -rf $today_img_file
  }
}

cleanup

if $is_new and (not (exists $today_img_file)) {
  fetch
  /run/current-system/sw/bin/ln -sf $today_img_file ( $pic_dir | path join "bg.png" )
}

cleanup