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

let
  username = config.defaultUser or "henrov";
  homeDir      = "/home/${username}";
  wallpaperSrc = "${flakeRoot}/assets/traveldroid/Wallpapers";
  wallpaperDst = "${homeDir}/Wallpapers";
  scriptFile   = "${wallpaperDst}/set-wallpapers-at-logon.sh";
in
{
  ############################
  # Systemwide packages
  ############################
  environment.systemPackages = with pkgs; [
    swww
    waypaper
    jq
    rsync
  ];

  ############################
  # User systemd service to start swww, sync wallpapers, and run the script
  ############################
  systemd.user.services.wallpaperSync = {
    description = "Sync Wallpapers and run set-wallpapers-at-logon.sh";
    wants = [ "graphical-session.target" ];
    after = [ "graphical-session.target" ];

    serviceConfig.Type = "oneshot";
    { config, pkgs, lib, flakeRoot, ... }:

    let
      username     = config.defaultUser or "henrov";
      homeDir      = "/home/${username}";
      wallpaperSrc = "${flakeRoot}/assets/traveldroid/Wallpapers";
      wallpaperDst = "${homeDir}/Wallpapers";
      scriptFile   = "${wallpaperDst}/set-wallpapers-at-logon.sh";
    in
    {
      environment.systemPackages = with pkgs; [
        swww
        waypaper
        jq
        rsync
      ];

      systemd.user.services.wallpaperSync = {
        description = "Sync Wallpapers and run set-wallpapers-at-logon.sh";
        wants = [ "graphical-session.target" ];
        after = [ "graphical-session.target" ];

        serviceConfig.Type = "oneshot";

        # Use a proper shell script invocation
        serviceConfig.ExecStart = ''
          ${pkgs.bash}/bin/bash -c '
            mkdir -p "${wallpaperDst}"
            rsync -avu --ignore-existing "${wallpaperSrc}/" "${wallpaperDst}/"
            rsync -avu "${wallpaperSrc}/" "${wallpaperDst}/"

            # Start swww if not running
            pgrep swww >/dev/null 2>&1 || swww &

            # Run the logon wallpaper script if executable
            if [ -x "${scriptFile}" ]; then
              "${scriptFile}"
            fi
          '
        '';

  ############################
  # Timer to run the service every 15 minutes
  ############################
  systemd.user.timers.wallpaperSyncTimer = {
    description = "Run wallpaperSync service every 15 minutes";
    wantedBy = [ "timers.target" ];
    timerConfig.OnBootSec = "1min";
    timerConfig.OnUnitActiveSec = "15min";
    timerConfig.Persistent = true;
  };
}