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

let
  username     = config.users.users.defaultUser or "henrov";
  homeDir      = "/home/${username}";
  wallpaperSrc = "${flakeRoot}/assets/traveldroid/Wallpapers";
  wallpaperDst = "${homeDir}/Wallpapers";
  scriptFile   = "${homeDir}/copy-wallpapers.sh";
in
{
  ############################
  # Ensure bash exists
  ############################
  environment.systemPackages = [ pkgs.bash ];

  ############################
  # Create the script in the user's home
  ############################
  home-manager.users = {
    ${username} = {
      home.file."copy-wallpapers.sh".text = ''
        #!/usr/bin/env bash
        set -e
        echo "Copying wallpapers from ${wallpaperSrc} to ${wallpaperDst} ..."

        if [ ! -d "${wallpaperSrc}" ]; then
          echo "ERROR: ${wallpaperSrc} does not exist"
          exit 1
        fi

        mkdir -p "${wallpaperDst}"

        # Copy everything
        cp -r "${wallpaperSrc}/." "${wallpaperDst}/"

        # Fix permissions
        chmod -R u+rwx "${wallpaperDst}"

        echo "Done copying wallpapers."
      '';
      home.file."copy-wallpapers.sh".executable = true;
    };
  };

  ############################
  # User systemd service that runs the script
  ############################
  systemd.user.services.copyWallpapers = {
    description = "Copy wallpapers from repo to ~/Wallpapers";
    wants       = [ "graphical-session.target" ];
    after       = [ "graphical-session.target" ];

    serviceConfig.Type      = "oneshot";
    serviceConfig.ExecStart = scriptFile;
    serviceConfig.Restart   = "no";
  };
}