export const DEFAULT_SELF_SIGNED_MSG =
  "This service uses a self-signed certificate. Expect a browser warning; proceed only if you trust this device.";

export function isValidLink(str) {
  if (!str) return true; // empty is allowed
  try {
    const u = new URL(str);
    return u.protocol === "http:" || u.protocol === "https:";
  } catch (e) {
    return false;
  }
}

export function normalizePath(path) {
  if (!path) return "";
  const trimmed = path.trim();
  if (!trimmed) return "";
  if (/\s/.test(trimmed)) return null; // no spaces or tabs in paths
  if (trimmed.startsWith("http://") || trimmed.startsWith("https://")) return null;
  return trimmed.startsWith("/") ? trimmed : `/${trimmed}`;
}

export function validateServiceFields({ name, port, path, notice, notice_link }, fail) {
  const err = (m) => {
    fail?.(m);
    return false;
  };
  if (!name || name.trim().length < 2) return err("Name must be at least 2 characters.");
  if (name.length > 48) return err("Name is too long (max 48 chars).");
  if (!Number.isInteger(port) || port < 1 || port > 65535) return err("Port must be 1-65535.");
  if (path === null) return err("Path must be relative (e.g. /admin) or blank.");
  if (path.length > 200) return err("Path is too long (max 200 chars).");
  if (notice && notice.length > 180) return err("Notice text too long (max 180 chars).");
  if (notice_link && notice_link.length > 200) return err("Notice link too long (max 200 chars).");
  if (!isValidLink(notice_link)) return err("Enter a valid URL (http/https) or leave blank.");
  return true;
}