{
  lib,
  config,
  ...
}: let
  inherit (lib) mkIf;
  cfg = config.desktops.ly;
in {
  config = mkIf cfg.enable {
    # display manager
    services.displayManager.ly = {
      enable = true;

      settings = let
        base = "0x00${config.theme.colors.base}";
        text = "0x00${config.theme.colors.text}";
        bold = "0x01${config.theme.colors.text}";
        error = "0x00${config.theme.colors.error}";
        red = "0x00${config.theme.colors.normal.red}";
        blue = "0x00${config.theme.colors.normal.blue}";
      in {
        # general
        clear_password = true;
        default_input = "password";
        xinitrc = "null";
        hide_version_string = true;
        hide_key_hints = true;
        session_log = "/dev/null";
        # state (evil)
        tty = 1;
        # background
        bg = base;
        error_bg = base;
        blank_box = true;
        # foreground
        fg = text;
        error_fg = error;
        border_fg = bold;
        # animation
        animation = "colormix";
        colormix_col1 = blue;
        colormix_col2 = red;
        colormix_col3 = "0x20000000";
      };
    };

    # disable default login on tty 1
    systemd.services."autovt@tty1".enable = false;
    systemd.services."getty@tty1".enable = false;

    # fix env not being set
    systemd.services.display-manager = {
      environment.XDG_CURRENT_DESKTOP = "X-NIXOS-SYSTEMD-AWARE";
    };

    # write save file
    environment.etc."ly/save.txt".text = ''
      0
      ${config.user}:1
    '';
  };
}