import type { ConfigField } from "../registry.js";

// Shared config-field presets so drivers stay terse and consistent.

export const hostField: ConfigField = {
  key: "host",
  label: "IP address / host",
  type: "host",
  required: true,
  help: "On the isolated device VLAN. See wiki/concepts/network-isolation.md.",
};

export function portField(def: number): ConfigField {
  return { key: "port", label: "Port", type: "port", required: true, default: def };
}

export const usernameField: ConfigField = {
  key: "username",
  label: "Username",
  type: "string",
  required: false,
};

export const passwordField: ConfigField = {
  key: "password",
  label: "Password",
  type: "secret",
  required: false,
};

/**
 * Sink for stub/diagnostic device messages. Defaults to a no-op so the package
 * has no host/runtime dependency; the server sets this to its Fastify logger.
 */
export type DeviceLogSink = (line: string) => void;

let sink: DeviceLogSink = () => {};

export function setDeviceLogSink(fn: DeviceLogSink): void {
  sink = fn;
}

/** Stubs log instead of performing real I/O. Replaced with real protocols later. */
export function stubLog(driverId: string, msg: string): void {
  sink(`[device:${driverId}] ${msg}`);
}