import { getLegacyBaseUrl } from './legacyUrls.js';

const localHostnames = new Set(['localhost', '127.0.0.1', '::1']);

function trimTrailingSlash(value) {
  return String(value || '').replace(/\/$/, '');
}

function currentHostname() {
  if (typeof window === 'undefined' || !window.location || !window.location.hostname) {
    return '';
  }

  return window.location.hostname.toLowerCase();
}

function resolveLegacyAssetBaseUrl() {
  const configuredAssetBaseUrl = trimTrailingSlash(import.meta.env.VITE_LEGACY_ASSET_BASE_URL || '');
  if (configuredAssetBaseUrl) {
    return configuredAssetBaseUrl;
  }

  if (localHostnames.has(currentHostname())) {
    return '/legacy-static';
  }

  return getLegacyBaseUrl();
}

const legacyAssetBaseUrl = resolveLegacyAssetBaseUrl();

export function legacyAsset(path) {
  return `${legacyAssetBaseUrl}${path.startsWith('/') ? path : `/${path}`}`;
}

export function injectLegacyStylesheets() {
  const stylesheets = [
    legacyAsset('/vendor/bootstrap/css/bootstrap.min.css'),
    'https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i',
    legacyAsset('/css/custom-style.css')
  ];

  stylesheets.forEach((href) => {
    if (document.head.querySelector(`link[data-legacy-href="${href}"]`)) {
      return;
    }

    const link = document.createElement('link');
    link.rel = 'stylesheet';
    link.href = href;
    link.dataset.legacyHref = href;
    document.head.appendChild(link);
  });
}