{ pkgs, config, ... }:
let
  fehCmd = "${pkgs.feh}/bin/feh";
  backgrounds_directory = ~/Immagini/Sfondi;
  update_time = "10m";
in
{
  home.file.".local/bin/update_background.sh" = {
    text = ''
      #!${pkgs.bash}/bin/bash
      image=`find ${backgrounds_directory} -type f | grep -v "/\." | shuf -n 1`
      ${fehCmd} --bg-fill --no-fehbg "$image"
    '';
    target = ".local/bin/update_background.sh";
    executable = true;
  };

  systemd.user.services."update-background" = {
    Unit = {
      Description = "Set random desktop background using feh";
      After = [ "graphical-session.pre.target" ];
      PartOf = [ "graphical-session.target" ];
      RequiresMountsFor = [ "/home/bertof/Immagini" ];
    };
    Install = {
      WantedBy = [ "graphical-session.target" ];
    };
    Service = {
      Type = "oneshot";
      IOSchedulingClass = "idle";
      ExecStart = "${config.home.homeDirectory}/${config.home.file.".local/bin/update_background.sh".target}";
    };
  };

  systemd.user.timers."update-background" = {
    Unit = { Description = "Set random desktop background using feh"; };
    Timer = { OnUnitActiveSec = update_time; };
    Install = { WantedBy = [ "timers.target" ]; };
  };
}