{ pkgs, config, lib, ... }:

{
  options.stylix.targets.feh.enable =
    config.lib.stylix.mkEnableTarget
    "the desktop background using Feh"
    true;

  config.xsession.initExtra =
    lib.mkIf (
      config.stylix.enable
      && config.stylix.targets.feh.enable
      && (
        with config.xsession.windowManager;
        bspwm.enable
        || herbstluftwm.enable
        || i3.enable
        || spectrwm.enable
        || xmonad.enable
      )
    ) (let
      inherit (config.stylix) imageScalingMode;
      bg-arg =
        if imageScalingMode == "fill"
        then "--bg-fill"
        else if imageScalingMode == "center"
        then "--bg-center"
        else if imageScalingMode == "tile"
        then "--bg-tile"
        else if imageScalingMode == "stretch"
        then "--bg-scale"
        # Fit
        else "--bg-max";
    in "${pkgs.feh}/bin/feh --no-fehbg ${bg-arg} ${config.stylix.image}");
}