import { ENV } from "./_core/env";

function hasProtocol(value: string) {
  return /^[a-z][a-z0-9+.-]*:\/\//i.test(value);
}

export function toPublicUrl(pathOrUrl: string) {
  const value = pathOrUrl.trim();
  if (!value) {
    throw new Error("Public URL value is empty");
  }

  if (hasProtocol(value)) {
    return value;
  }

  if (!ENV.appPublicBaseUrl) {
    throw new Error("APP_PUBLIC_BASE_URL is required for externally accessible asset URLs");
  }

  return new URL(value.startsWith("/") ? value : `/${value}`, ENV.appPublicBaseUrl).toString();
}