import * as URI from 'urijs';

import { getConfiguration } from 'scrivito_sdk/app_support/configure';

export async function checkIfTrustedOrigin(origin: string): Promise<boolean> {
  if (
    origin === window.location.origin ||
    originMatches(origin, 'https://*.scrivito.com')
  ) {
    return true;
  }

  const configuration = await getConfiguration();
  const adoptUi = configuration.adoptUi;
  if (typeof adoptUi === 'string' && originMatches(origin, adoptUi)) {
    return true;
  }

  const unstableOrigins = configuration.unstable?.trustedUiOrigins ?? [];

  const origins = [...unstableOrigins, ...getLocalOrigins()];

  return origins.some((trustedOrigin) => originMatches(origin, trustedOrigin));
}

function originMatches(origin: string, pattern: string): boolean {
  const originUrl = new URI(origin);
  const patternUrl = new URI(pattern);

  return (
    originUrl.protocol() === patternUrl.protocol() &&
    hostMatches(originUrl.host(), patternUrl.host())
  );
}

function hostMatches(host: string, hostPattern: string) {
  if (hostPattern.substr(0, 2) === '*.') {
    const postfix = hostPattern.substr(1);

    return host.substr(-postfix.length) === postfix;
  }

  return host === hostPattern;
}

function getLocalOrigins() {
  // use this to make your local browser trust certain UI origins.
  // intended for debugging purposes.
  // note: you may have to allow 3rd party cookies in your browser
  // for this to work!
  return (
    window.localStorage.getItem('SCRIVITO_TRUSTED_UI_ORIGINS')?.split(' ') ?? []
  );
}