preseed/nixos/kiosk.nix

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

{
  ############################################
  # Base system
  ############################################
  nixpkgs.hostPlatform = "x86_64-linux";
  system.stateVersion = "24.11";

  # Simple console-based kiosk using cage (Wayland single-app compositor)
  services.xserver.enable = false; # Not using an X11 display manager

  # Autologin to TTY1 as kiosk user
  services.getty.autologinUser = "kiosk";

  # Kiosk user
  users.users.kiosk = {
    isNormalUser = true;
    description = "Kiosk User";
    home = "/home/kiosk";
    extraGroups = [ "wheel" ];
    initialPassword = "kiosk";
  };

  # Packages required (aligning with the Debian preseed intent)
  environment.systemPackages = with pkgs; [
    firefox
    cage
    curl
    unzip
    # chromium # available if you want it in addition to Firefox
  ];

  ############################################
  # Firefox policies (preconfigured profile settings)
  ############################################
  programs.firefox = {
    enable = true;
    policies = {
      DisableDeveloperTools = true;
      BlockAboutAddons = true;
      BlockAboutConfig = true;
      BlockAboutProfiles = true;
      BlockAboutSupport = true;
      DisableFirefoxAccounts = true;
      DisablePrivateBrowsing = true;
      DisableProfileImport = true;
      DisableProfileRefresh = true;
      DisableSafeMode = true;
      DisablePocket = true;
      DisableFirefoxScreenshots = true;
      DisableSetDesktopBackground = true;

      Homepage = {
        URL = "https://mahn.ke";
        Locked = true;
      };

      NewTabPage = { Enabled = false; };

      # Use a Linux path for downloads in kiosk
      DownloadDirectory = {
        Path = "/home/kiosk/Downloads";
        Locked = true;
      };

      PromptForDownloadLocation = false;
      StartDownloadsInTempDirectory = false;
      DisableAppUpdate = true;

      Permissions = {
        Camera = "deny";
        Microphone = "deny";
        Location = "deny";
        Notifications = "deny";
      };

      ShowHomeButton = false;
      DisplayMenuBar = false;
      DisplayBookmarksToolbar = false;

      # Extension & user messaging controls (per your Debian policy JSON)
      UserMessaging = {
        ExtensionRecommendations = false;
        FeatureRecommendations = false;
        UrlbarInterventions = false;
        SkipOnboarding = false;
        MoreFromMozilla = false;
        FirefoxLabs = false;
        Locked = false;
      };

      # Install Tampermonkey automatically (Firefox will fetch at runtime).
      # Note: AMO URL may change; this is the typical latest channel.
      Extensions = {
        Install = [
          "https://addons.mozilla.org/firefox/downloads/latest/tampermonkey/latest.xpi"
        ];
      };
    };

    # Helpful preferences to keep Firefox minimal
    preferences = {
      "browser.fullscreen.autohide" = true;
      "browser.shell.checkDefaultBrowser" = false;
      "browser.startup.page" = 1; # Start with homepage
    };
  };

  ############################################
  # Kiosk launch behavior (replicates your bash_profile approach)
  ############################################
  # Create a bash_profile for the kiosk user that launches cage + firefox
  system.activationScripts.kioskBashProfile = lib.stringAfter ["users"] ''
    mkdir -p /home/kiosk
    chown kiosk:kiosk /home/kiosk
    sudo -u kiosk mkdir -p /home/kiosk/.config
    cat > /home/kiosk/.bash_profile <<'EOF'
if [ -z "$WAYLAND_DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
    exec ${pkgs.cage}/bin/cage ${pkgs.firefox}/bin/firefox --kiosk https://c3nav.de
fi
EOF
    chown kiosk:kiosk /home/kiosk/.bash_profile
  '';

  # Unpack preconfigured Firefox profile from the repository into kiosk's home
  system.activationScripts.kioskFirefoxProfile = lib.stringAfter ["users"] ''
    mkdir -p /home/kiosk/.mozilla/firefox
    # Only unzip if directory is empty (first activation)
    if [ -z "$(ls -A /home/kiosk/.mozilla/firefox 2>/dev/null)" ]; then
      ${pkgs.unzip}/bin/unzip -o ${../Firefox.zip} -d /home/kiosk/.mozilla/firefox
      chown -R kiosk:kiosk /home/kiosk/.mozilla/firefox
    fi
  '';

  ############################################
  # Include your userscripts in the image for easy import
  ############################################
  environment.etc."kiosk/tampermonkey".source = ./../tampermonkey;

  ############################################
  # Networking & basic services
  ############################################
  networking.hostName = "kiosk";
  time.timeZone = "UTC";
  services.openssh.enable = true; # optional, mirrors preseed tasksel ssh-server


  # Keep system simple, disable unneeded DM
  services.displayManager.enable = false;
}