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

let cfg = config.this.laptop.thinkpad;
    mkZcfanConf = c: lib.generators.toKeyValue {
      mkKeyValue = lib.generators.mkKeyValueDefault {} " ";
    } c;
    zcfanConf = mkZcfanConf cfg.zcfan.settings;
in
{
  options = {
    this.laptop.thinkpad = {
      enable = lib.mkEnableOption "thinkpad settings";
      zcfan = {
        settings = lib.mkOption {
          type = with lib.types;
            attrsOf (oneOf [int str]);
          default = { };
          description = "Settings for zcfan.";
        };
      };
    };
  };

  config = lib.mkIf cfg.enable {
    boot.extraModprobeConfig = "options thinkpad_acpi fan_control=1";

    environment.etc."zcfan.conf" = lib.mkIf (zcfanConf != "") { text = zcfanConf; };
    environment.systemPackages = [ pkgs.zcfan ];
    systemd.packages = [ pkgs.zcfan ];
    systemd.services.zcfan.wantedBy = [ "multi-user.target" ];
  };
}