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

let
  username = config.defaultUser or "henrov";
  homeDir  = "/home/${username}";

  wallpaperSrc = "${flakeRoot}/assets/traveldroid/copy_2_home/wallpaperstuff";
  wallpaperDst = "${homeDir}/wallpaperstuff";
in
{
  #################################
  # System packages (global)
  #################################

  environment.systemPackages = [
    pkgs.swww
    pkgs.waypaper
    pkgs.rsync
  ];

  #################################
  # Copy editable wallpaper folder
  #################################

  systemd.services.copyWallpaperStuff = {
    description = "Copy wallpaper assets to user home";
    wantedBy = [ "multi-user.target" ];

    serviceConfig = {
      Type = "oneshot";
    };

    script = ''
      if [ ! -d "${wallpaperDst}" ]; then
        mkdir -p "${wallpaperDst}"
        cp -r ${wallpaperSrc}/* "${wallpaperDst}/"
      fi

      chown -R ${username}:${username} "${wallpaperDst}"
      chmod -R u+rwx "${wallpaperDst}"
    '';
  };

  #################################
  # Home Manager integration
  #################################

  _module.args.hmUsers = {
    ${username} = {

      #################################
      # User packages
      #################################

      home.packages = [
        pkgs.swww
        pkgs.waypaper
      ];

      #################################
      # swww daemon
      #################################

      systemd.user.services.swww-daemon = {
        Unit = {
          Description = "swww wallpaper daemon";
          After = [ "graphical-session.target" ];
        };

        Service = {
          ExecStart = "${pkgs.swww}/bin/swww-daemon";
          Restart = "on-failure";
        };

        Install = {
          WantedBy = [ "graphical-session.target" ];
        };
      };

      #################################
      # Set initial wallpaper
      #################################

      systemd.user.services.swww-init = {
        Unit = {
          Description = "Initialize wallpaper with swww";
          After = [ "swww-daemon.service" ];
        };

        Service = {
          Type = "oneshot";
          ExecStart = ''
            ${pkgs.swww}/bin/swww img ${wallpaperDst}/* --transition-type any
          '';
        };

        Install = {
          WantedBy = [ "graphical-session.target" ];
        };
      };
    };
  };
}