/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

import { createSelector } from "reselect";
import { parse } from "../utils/url";

export const getThreads = createSelector(
  state => state.threads.threads,
  threads => threads.filter(thread => !isMainThread(thread))
);

export const getAllThreads = createSelector(
  getMainThread,
  getThreads,
  (mainThread, threads) => {
    const orderedThreads = Array.from(threads).sort((threadA, threadB) => {
      if (threadA.name === threadB.name) {
        return 0;
      }
      return threadA.name < threadB.name ? -1 : 1;
    });
    return [mainThread, ...orderedThreads].filter(Boolean);
  }
);

function isMainThread(thread) {
  return thread.isTopLevel;
}

export function getMainThread(state) {
  return state.threads.threads.find(isMainThread);
}

/*
 * Gets domain from the main thread url (without www prefix)
 */
export function getMainThreadHost(state) {
  const url = getMainThread(state)?.url;
  if (!url) {
    return null;
  }
  const { host } = parse(url);
  if (!host) {
    return null;
  }
  return host.startsWith("www.") ? host.substring("www.".length) : host;
}

export function getThread(state, threadActor) {
  return getAllThreads(state).find(thread => thread.actor === threadActor);
}

export function getIsThreadCurrentlyTracing(state, thread) {
  return state.threads.mutableTracingThreads.has(thread);
}
