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

let
  cfg = config.modules.system.syncthing;
in
{
  options.modules.system.syncthing = {
    enable = lib.mkEnableOption "enables syncthing";

    mode = lib.mkOption {
      type = lib.types.enum [ "server" "client" ];
      default = "client";
      description = "whether syncthing should run as a client (user) or server (system-wide).";
    };

    data_dir = lib.mkOption {
      type = lib.types.str;
      default = "/var/lib/syncthing";
      description = "optional override for syncthing data directory.";
    };

    config_dir = lib.mkOption {
      type = lib.types.str;
      default = "/var/lib/syncthing/config";
      description = "optional override for syncthing config directory.";
    };
  };

  config = lib.mkIf cfg.enable {
    services.syncthing = {
      enable = true;
      user = "blake";
      group = "blake";

      dataDir = cfg.data_dir or (if cfg.mode == "server" then "/var/lib/syncthing" else "/home/blake/.local/state/syncthing");
      configDir = cfg.config_dir or (if cfg.mode == "server" then "/var/lib/syncthing/config" else "/home/blake/.config/syncthing");

      # webui
      guiAddress = "0.0.0.0:2222";
      openDefaultPorts = true;
    };
  };
}