nixos-config/modules/greetd/default.nix

{ pkgs
, config
, lib
, ...
}:
with lib; let
  cfg = config.eboskma.greetd;
  steamCfg = config.programs.steam;

  style = builtins.readFile ./greetd.css;

  swaySession = pkgs.writeShellScript "sway-session" ''
    ${pkgs.sway}/bin/sway --unsupported-gpu
  '';

  steam-gamescope =
    let
      exports = builtins.attrValues (builtins.mapAttrs (n: v: "export ${n}=${v}") steamCfg.gamescopeSession.env);
    in
    pkgs.writeShellScriptBin "steam-gamescope" ''
      ${builtins.concatStringsSep "\n" exports}
      gamescope --steam ${toString steamCfg.gamescopeSession.args} -- steam -tenfoot -pipewire-dmabuf
    '';

  envVars = concatStringsSep " " (builtins.attrNames config.environment.sessionVariables);

  moduleStr = moduleType: name: attrs: ''
    ${moduleType} "${name}" {
    ${builtins.concatStringsSep "\n" (lib.mapAttrsToList (name: value: "${name} ${value}") attrs)}
    }
  '';

  inputStr = moduleStr "input";
  outputStr = moduleStr "output";
in
{
  options.eboskma.greetd = {
    enable = mkEnableOption "enable greetd";
    sway = mkEnableOption "sway";
    steam = mkEnableOption "steam";
    wayvnc = mkEnableOption "wayvnc";
    output = mkOption {
      description = "An attribute set that defines output modules. See the sway-output(5) manpage for options";
      type = types.attrsOf (types.attrsOf types.str);
      default = { };
    };
    input = mkOption {
      description = "An attribute set that defines input modules. See the sway-input(5) manpage for options";
      type = types.attrsOf (types.attrsOf types.str);
      default = { };
    };
    wallpaper = mkOption {
      description = "Path to an image to use as wallpaper";
      type = types.path;
    };
  };

  config =
    mkIf cfg.enable
      {
        services.greetd = {
          enable = true;
          restart = true;
          settings = {
            default_session = {
              command = "${pkgs.sway}/bin/sway --unsupported-gpu --config /etc/greetd/sway-config";
            };
          };
        };

        programs.regreet = {
          enable = false;
          settings = {
            background = {
              path = cfg.wallpaper;
              fit = "Cover";
            };

            GTK = {
              application_prefer_dark_theme = true;
              theme_name = "elementary";
              cursor_theme = "elementary";
              icon_theme_name = "elementary";
              font_name = "Iosevka Aile 16";
            };

            commands = {
              reboot = [ "systemctl" "reboot" ];
              poweroff = [ "systemctl" "poweroff" ];
            };
          };
        };

        security.pam.services.greetd.u2fAuth = false;


        # exec "${pkgs.greetd.regreet}/bin/regreet; swaymsg exit"

        networking.firewall.allowedTCPPorts = lib.mkIf (cfg.wayvnc && !config.services.tailscale.enable) [ 5900 ];

        environment = {
          systemPackages = with pkgs; [ pantheon.elementary-gtk-theme pantheon.elementary-icon-theme ];
          etc = {
            "greetd/sway-config" = {
              text = lib.concatStringsSep "\n"
                ((lib.optional cfg.wayvnc "exec ${pkgs.wayvnc}/bin/wayvnc 0.0.0.0") ++
                  [
                    ''
                      exec "${pkgs.greetd.gtkgreet}/bin/gtkgreet -l -s /etc/greetd/gtkgreet.css -b ${cfg.wallpaper}; swaymsg exit"
                      include /etc/sway/config.d/*
                    ''
                  ]
                  ++ (mapAttrsToList inputStr cfg.input)
                  ++ (mapAttrsToList outputStr cfg.output));
              user = "greeter";
              group = "greeter";
            };
            "greetd/environments" = {
              text = concatStringsSep "\n" ((optional cfg.sway "${swaySession}")
                ++ (optional cfg.steam "${steam-gamescope}")
                ++ [
                "${pkgs.bash}/bin/bash"
              ]);
              user = "greeter";
              group = "greeter";
            };
            "greetd/gtkgreet.css" = {
              text = style;
              user = "greeter";
              group = "greeter";
            };
            "sway/config.d/systemd-env.conf" = {
              text = ''
                exec_always --no-startup-id systemctl --user import-environment ${envVars}
                exec_always --no-startup-id dbus-update-activation-environment --systemd ${envVars}
              '';
            };
            "xdg/gtk-3.0/settings.ini" = {
              text = generators.toINI { } {
                Settings = {
                  gtk-theme-name = "elementary";
                  gtk-icon-theme-name = "elementary";
                  gtk-cursor-theme-name = "elementary";
                  gtk-application-prefer-dark-theme = "true";
                };
              };
            };
            "xdg/gtk-4.0/settings.ini" = {
              text = generators.toINI { } {
                Settings = {
                  gtk-theme-name = "elementary";
                  gtk-icon-theme-name = "elementary";
                  gtk-cursor-theme-name = "elementary";
                  gtk-application-prefer-dark-theme = "true";
                };
              };
            };
          };
        };
      };
}