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

# Since this will be exported as an installer ISO, you'll have to keep in mind
# about the added imports from nixos-generators. In this case, it simply adds
# the NixOS installation CD profile.
{
  imports = [
    "${modulesPath}/installer/cd-dvd/installation-cd-graphical-base.nix"
  ];

  config = lib.mkMerge [
    {
      boot.kernelPackages = pkgs.linuxPackages_6_6;

      # Use my desktop environment configuration without the apps just to make the
      # closure size smaller.
      workflows.workflows.a-happy-gnome = {
        enable = true;
        extraApps = [ ];
      };

      # Some niceties.
      suites.desktop.enable = true;

      services.xserver.displayManager = {
        gdm = {
          enable = true;
          autoSuspend = false;
        };
        autoLogin = {
          enable = true;
          user = "nixos";
        };
      };

      system.stateVersion = "23.11";
    }

    (lib.mkIf (config.formatAttr == "install-iso") {
      isoImage = {
        isoBaseName = config.networking.hostName;

        # Put the source code somewhere easy to see.
        contents = [{
          source = ../../..;
          target = "/etc/nixos";
        }];

        squashfsCompression = "zstd -Xcompression-level 12";
      };
    })
  ];
}