/**
 * Copyright (c) 2021 OpenLens Authors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import type { ClusterId } from "../cluster-types";

/**
 * Grab the `ClusterId` out of a host that was generated by `getClusterFrameUrl`, or nothing
 * @param host The host section of a URL
 * @returns The `ClusterId` part of the host, or `undefined`
 */
export function getClusterIdFromHost(host: string): ClusterId | undefined {
  // e.g host == "%clusterId.localhost:45345"
  const subDomains = host.split(":")[0].split(".");

  return subDomains.slice(-2, -1)[0]; // ClusterId or undefined
}

/**
 * Get the OpenLens backend routing host for a given `ClusterId`
 * @param clusterId The ID to put in front of the current host
 * @returns a new URL host section
 */
export function getClusterFrameUrl(clusterId: ClusterId) {
  return `//${clusterId}.${location.host}`;
}

/**
 * Get the result of `getClusterIdFromHost` from the current `location.host`
 */
export function getHostedClusterId(): ClusterId | undefined {
  return getClusterIdFromHost(location.host);
}

/**
 * Returns true only if code is running within a cluster iframe context
 */
export function isClusterPageContext(): boolean {
  if (typeof window === "undefined") return false;

  return !!getClusterIdFromHost(window.location.host);
}