{ config, lib, pkgs, ... }: let
  inherit (lib) mkIf;
  set-wallpaper = pkgs.writeTextFile {
    name = "set-wallpaper";
    text = ''
      #!/usr/bin/env nu
      def main [url_or_path: string] {
        if ($url_or_path | str starts-with "http") {
          let wallpaper_dir = $"($env.HOME)/wallpapers"
          mkdir $wallpaper_dir
          # Extract filename from URL
          let filename = ($url_or_path | url parse | get path | path basename)
          let wallpaper_file = $"($wallpaper_dir)/($filename)"
          if ($wallpaper_file | path exists) {
            print $"Wallpaper already exists: ($wallpaper_file)"
            ^${pkgs.swww}/bin/swww img $wallpaper_file o+e>| ignore
            print "Using existing wallpaper"
            return
          }
          print $"Downloading wallpaper to ($wallpaper_file)..."
          try {
            ${pkgs.curl}/bin/curl -L -o $wallpaper_file $url_or_path
            ^${pkgs.swww}/bin/swww img $wallpaper_file o+e>| ignore
            print $"Wallpaper downloaded and set: ($wallpaper_file)"
          } catch {
            print "Failed to download wallpaper"
            exit 1
          }
        } else {
          ^${pkgs.swww}/bin/swww img $url_or_path o+e>| ignore
        }
      }
    '';
    executable = true;
    destination = "/bin/set-wallpaper";
  };
  pick-wallpaper = pkgs.writeTextFile {
    name = "pick-wallpaper";
    text = ''
      #!/usr/bin/env nu
      def main [] {
        let wallpaper_dir = $"($env.HOME)/wallpapers"
        mkdir $wallpaper_dir
        let wallpapers = (ls $wallpaper_dir | where type == file | where name =~ '\.(jpg|png|jpeg|webp)$')
        if ($wallpapers | is-empty) {
          print $"No wallpapers found in ($wallpaper_dir)"
          exit 1
        }
        # Use fzf with chafa for preview
        let selected = (
          $wallpapers
          | get name
          | str join "\n"
          | ^${pkgs.fzf}/bin/fzf --preview $"${pkgs.chafa}/bin/chafa --size 40x20 {}" --preview-window=right:50% --prompt="Select wallpaper: "
        )
        if not ($selected | is-empty) {
          ^${pkgs.swww}/bin/swww img $selected o+e>| ignore
          print $"Wallpaper set: (($selected | path basename))"
        }
      }
    '';
    executable = true;
    destination = "/bin/pick-wallpaper";
  };
  save-wallpaper = pkgs.writeTextFile {
    name = "save-wallpaper";
    text = ''
      #!/usr/bin/env nu
      def main [url: string] {
        if not ($url | str starts-with "http") {
          print "Error: Please provide a valid URL"
          exit 1
        }
        let wallpaper_dir = $"($env.HOME)/wallpapers"
        mkdir $wallpaper_dir
        # Extract filename from URL
        let filename = ($url | url parse | get path | path basename)
        let wallpaper_file = $"($wallpaper_dir)/($filename)"
        if ($wallpaper_file | path exists) {
          print $"Wallpaper already exists: ($wallpaper_file)"
          return
        }
        print $"Downloading wallpaper to ($wallpaper_file)..."
        try {
          ${pkgs.curl}/bin/curl -L -o $wallpaper_file $url
          print $"Wallpaper saved: ($wallpaper_file)"
        } catch {
          print "Failed to download wallpaper"
          exit 1
        }
      }
    '';
    executable = true;
    destination = "/bin/save-wallpaper";
  };
in mkIf config.isDesktopNotWsl {
  environment.systemPackages = [
    pkgs.swww
    pkgs.chafa  # Terminal image viewer for previews.
    set-wallpaper
    pick-wallpaper
    save-wallpaper
  ];
  home-manager.sharedModules = [{
    # Auto-start swww daemon.
    wayland.windowManager.hyprland.settings.exec-once = [
      "swww-daemon"
      # "swww img /path/to/your/wallpaper.jpg" # Can be used to auto-set an initial wallpaper.
    ];
    # Desktop entry for fuzzel.
    xdg.desktopEntries.pick-wallpaper = {
      name     = "Pick Wallpaper";
      exec     = "pick-wallpaper";
      terminal = true;
    };
  }];
}