lemmy-ui/src/shared/utils.ts

import { Err, None, Ok, Option, Result, Some } from "@sniptt/monads";
import { ClassConstructor, deserialize, serialize } from "class-transformer";
import emojiShortName from "emoji-short-name";
import {
  BlockCommunityResponse,
  BlockPersonResponse,
  Comment as CommentI,
  CommentNode as CommentNodeI,
  CommentReportView,
  CommentSortType,
  CommentView,
  CommunityBlockView,
  CommunityModeratorView,
  CommunityView,
  GetSiteMetadata,
  GetSiteResponse,
  LemmyHttp,
  LemmyWebsocket,
  ListingType,
  MyUserInfo,
  PersonBlockView,
  PersonSafe,
  PersonViewSafe,
  PostReportView,
  PostView,
  PrivateMessageReportView,
  PrivateMessageView,
  RegistrationApplicationView,
  Search,
  SearchType,
  SortType,
} from "lemmy-js-client";
import markdown_it from "markdown-it";
import markdown_it_container from "markdown-it-container";
import markdown_it_footnote from "markdown-it-footnote";
import markdown_it_html5_embed from "markdown-it-html5-embed";
import markdown_it_sub from "markdown-it-sub";
import markdown_it_sup from "markdown-it-sup";
import moment from "moment";
import { Subscription } from "rxjs";
import { delay, retryWhen, take } from "rxjs/operators";
import tippy from "tippy.js";
import Toastify from "toastify-js";
import { httpBase } from "./env";
import { i18n, languages } from "./i18next";
import { DataType, IsoData } from "./interfaces";
import { UserService, WebSocketService } from "./services";

var Tribute: any;
if (isBrowser()) {
  Tribute = require("tributejs");
}

export const wsClient = new LemmyWebsocket();

export const favIconUrl = "/static/assets/icons/favicon.svg";
export const favIconPngUrl = "/static/assets/icons/apple-touch-icon.png";
// TODO
// export const defaultFavIcon = `${window.location.protocol}//${window.location.host}${favIconPngUrl}`;
export const repoUrl = "https://github.com/LemmyNet";
export const joinLemmyUrl = "https://join-lemmy.org";
export const donateLemmyUrl = `${joinLemmyUrl}/donate`;
export const docsUrl = `${joinLemmyUrl}/docs/en/index.html`;
export const helpGuideUrl = `${joinLemmyUrl}/docs/en/about/guide.html`; // TODO find a way to redirect to the non-en folder
export const markdownHelpUrl = `${helpGuideUrl}#using-markdown`;
export const sortingHelpUrl = `${helpGuideUrl}#sorting`;
export const archiveTodayUrl = "https://archive.today";
export const ghostArchiveUrl = "https://ghostarchive.org";
export const webArchiveUrl = "https://web.archive.org";
export const elementUrl = "https://element.io";

export const postRefetchSeconds: number = 60 * 1000;
export const fetchLimit = 40;
export const trendingFetchLimit = 6;
export const mentionDropdownFetchLimit = 10;
export const commentTreeMaxDepth = 8;
export const markdownFieldCharacterLimit = 50000;

export const relTags = "noopener nofollow";

const DEFAULT_ALPHABET =
  "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

function getRandomCharFromAlphabet(alphabet: string): string {
  return alphabet.charAt(Math.floor(Math.random() * alphabet.length));
}

export function randomStr(
  idDesiredLength = 20,
  alphabet = DEFAULT_ALPHABET
): string {
  /**
   * Create n-long array and map it to random chars from given alphabet.
   * Then join individual chars as string
   */
  return Array.from({ length: idDesiredLength })
    .map(() => {
      return getRandomCharFromAlphabet(alphabet);
    })
    .join("");
}

export const md = new markdown_it({
  html: false,
  linkify: true,
  typographer: true,
})
  .use(markdown_it_sub)
  .use(markdown_it_sup)
  .use(markdown_it_footnote)
  .use(markdown_it_html5_embed, {
    html5embed: {
      useImageSyntax: true, // Enables video/audio embed with ![]() syntax (default)
      attributes: {
        audio: 'controls preload="metadata"',
        video:
          'width="100%" max-height="100%" controls loop preload="metadata"',
      },
    },
  })
  .use(markdown_it_container, "spoiler", {
    validate: function (params: any) {
      return params.trim().match(/^spoiler\s+(.*)$/);
    },

    render: function (tokens: any, idx: any) {
      var m = tokens[idx].info.trim().match(/^spoiler\s+(.*)$/);

      if (tokens[idx].nesting === 1) {
        // opening tag
        return `<details><summary> ${md.utils.escapeHtml(m[1])} </summary>\n`;
      } else {
        // closing tag
        return "</details>\n";
      }
    },
  });

export function hotRankComment(comment_view: CommentView): number {
  return hotRank(comment_view.counts.score, comment_view.comment.published);
}

export function hotRankActivePost(post_view: PostView): number {
  return hotRank(post_view.counts.score, post_view.counts.newest_comment_time);
}

export function hotRankPost(post_view: PostView): number {
  return hotRank(post_view.counts.score, post_view.post.published);
}

export function hotRank(score: number, timeStr: string): number {
  // Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
  let date: Date = new Date(timeStr + "Z"); // Add Z to convert from UTC date
  let now: Date = new Date();
  let hoursElapsed: number = (now.getTime() - date.getTime()) / 36e5;

  let rank =
    (10000 * Math.log10(Math.max(1, 3 + score))) /
    Math.pow(hoursElapsed + 2, 1.8);

  // console.log(`Comment: ${comment.content}\nRank: ${rank}\nScore: ${comment.score}\nHours: ${hoursElapsed}`);

  return rank;
}

export function mdToHtml(text: string) {
  return { __html: md.render(text) };
}

export function mdToHtmlInline(text: string) {
  return { __html: md.renderInline(text) };
}

export function getUnixTime(text: string): number {
  return text ? new Date(text).getTime() / 1000 : undefined;
}

export function futureDaysToUnixTime(days: number): number {
  return days
    ? Math.trunc(
        new Date(Date.now() + 1000 * 60 * 60 * 24 * days).getTime() / 1000
      )
    : undefined;
}

export function canMod(
  mods: Option<CommunityModeratorView[]>,
  admins: Option<PersonViewSafe[]>,
  creator_id: number,
  myUserInfo = UserService.Instance.myUserInfo,
  onSelf = false
): boolean {
  // You can do moderator actions only on the mods added after you.
  let adminsThenMods = admins
    .unwrapOr([])
    .map(a => a.person.id)
    .concat(mods.unwrapOr([]).map(m => m.moderator.id));

  return myUserInfo.match({
    some: me => {
      let myIndex = adminsThenMods.findIndex(
        id => id == me.local_user_view.person.id
      );
      if (myIndex == -1) {
        return false;
      } else {
        // onSelf +1 on mod actions not for yourself, IE ban, remove, etc
        adminsThenMods = adminsThenMods.slice(0, myIndex + (onSelf ? 0 : 1));
        return !adminsThenMods.includes(creator_id);
      }
    },
    none: false,
  });
}

export function canAdmin(
  admins: Option<PersonViewSafe[]>,
  creator_id: number,
  myUserInfo = UserService.Instance.myUserInfo,
  onSelf = false
): boolean {
  return canMod(None, admins, creator_id, myUserInfo, onSelf);
}

export function isMod(
  mods: Option<CommunityModeratorView[]>,
  creator_id: number
): boolean {
  return mods.match({
    some: mods => mods.map(m => m.moderator.id).includes(creator_id),
    none: false,
  });
}

export function amMod(
  mods: Option<CommunityModeratorView[]>,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  return myUserInfo.match({
    some: mui => isMod(mods, mui.local_user_view.person.id),
    none: false,
  });
}

export function isAdmin(
  admins: Option<PersonViewSafe[]>,
  creator_id: number
): boolean {
  return admins.match({
    some: admins => admins.map(a => a.person.id).includes(creator_id),
    none: false,
  });
}

export function amAdmin(myUserInfo = UserService.Instance.myUserInfo): boolean {
  return myUserInfo
    .map(mui => mui.local_user_view.person.admin)
    .unwrapOr(false);
}

export function amCommunityCreator(
  mods: Option<CommunityModeratorView[]>,
  creator_id: number,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  return mods.match({
    some: mods =>
      myUserInfo
        .map(mui => mui.local_user_view.person.id)
        .match({
          some: myId =>
            myId == mods[0].moderator.id &&
            // Don't allow mod actions on yourself
            myId != creator_id,
          none: false,
        }),
    none: false,
  });
}

export function amSiteCreator(
  admins: Option<PersonViewSafe[]>,
  creator_id: number,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  return admins.match({
    some: admins =>
      myUserInfo
        .map(mui => mui.local_user_view.person.id)
        .match({
          some: myId =>
            myId == admins[0].person.id &&
            // Don't allow mod actions on yourself
            myId != creator_id,
          none: false,
        }),
    none: false,
  });
}

export function amTopMod(
  mods: Option<CommunityModeratorView[]>,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  return mods.match({
    some: mods =>
      myUserInfo.match({
        some: mui => mods[0].moderator.id == mui.local_user_view.person.id,
        none: false,
      }),
    none: false,
  });
}

const imageRegex = /(http)?s?:?(\/\/[^"']*\.(?:jpg|jpeg|gif|png|svg|webp))/;
const videoRegex = /(http)?s?:?(\/\/[^"']*\.(?:mp4|webm))/;

export function isImage(url: string) {
  return imageRegex.test(url);
}

export function isVideo(url: string) {
  return videoRegex.test(url);
}

export function validURL(str: string) {
  return !!new URL(str);
}

export function communityRSSUrl(actorId: string, sort: string): string {
  let url = new URL(actorId);
  return `${url.origin}/feeds${url.pathname}.xml?sort=${sort}`;
}

export function validEmail(email: string) {
  let re =
    /^(([^\s"(),.:;<>@[\\\]]+(\.[^\s"(),.:;<>@[\\\]]+)*)|(".+"))@((\[(?:\d{1,3}\.){3}\d{1,3}])|(([\dA-Za-z\-]+\.)+[A-Za-z]{2,}))$/;
  return re.test(String(email).toLowerCase());
}

export function capitalizeFirstLetter(str: string): string {
  return str.charAt(0).toUpperCase() + str.slice(1);
}

export function routeSortTypeToEnum(sort: string): SortType {
  return SortType[sort];
}

export function listingTypeFromNum(type_: number): ListingType {
  return Object.values(ListingType)[type_];
}

export function sortTypeFromNum(type_: number): SortType {
  return Object.values(SortType)[type_];
}

export function routeListingTypeToEnum(type: string): ListingType {
  return ListingType[type];
}

export function routeDataTypeToEnum(type: string): DataType {
  return DataType[capitalizeFirstLetter(type)];
}

export function routeSearchTypeToEnum(type: string): SearchType {
  return SearchType[type];
}

export async function getSiteMetadata(url: string) {
  let form = new GetSiteMetadata({
    url,
  });
  let client = new LemmyHttp(httpBase);
  return client.getSiteMetadata(form);
}

export function debounce(func: any, wait = 1000, immediate = false) {
  // 'private' variable for instance
  // The returned function will be able to reference this due to closure.
  // Each call to the returned function will share this common timer.
  let timeout: any;

  // Calling debounce returns a new anonymous function
  return function () {
    // reference the context and args for the setTimeout function
    var args = arguments;

    // Should the function be called now? If immediate is true
    //   and not already in a timeout then the answer is: Yes
    var callNow = immediate && !timeout;

    // This is the basic debounce behaviour where you can call this
    //   function several times, but it will only execute once
    //   [before or after imposing a delay].
    //   Each time the returned function is called, the timer starts over.
    clearTimeout(timeout);

    // Set the new timeout
    timeout = setTimeout(function () {
      // Inside the timeout function, clear the timeout variable
      // which will let the next execution run when in 'immediate' mode
      timeout = null;

      // Check if the function already ran with the immediate flag
      if (!immediate) {
        // Call the original function with apply
        // apply lets you define the 'this' object as well as the arguments
        //    (both captured before setTimeout)
        func.apply(this, args);
      }
    }, wait);

    // Immediate mode and no wait timer? Execute the function..
    if (callNow) func.apply(this, args);
  };
}

export function getLanguages(
  override?: string,
  myUserInfo = UserService.Instance.myUserInfo
): string[] {
  let myLang = myUserInfo
    .map(m => m.local_user_view.local_user.interface_language)
    .unwrapOr("browser");
  let lang = override || myLang;

  if (lang == "browser" && isBrowser()) {
    return getBrowserLanguages();
  } else {
    return [lang];
  }
}

function getBrowserLanguages(): string[] {
  // Intersect lemmy's langs, with the browser langs
  let langs = languages ? languages.map(l => l.code) : ["en"];

  // NOTE, mobile browsers seem to be missing this list, so append en
  let allowedLangs = navigator.languages
    .concat("en")
    .filter(v => langs.includes(v));
  return allowedLangs;
}

export async function fetchThemeList(): Promise<string[]> {
  return fetch("/css/themelist").then(res => res.json());
}

export async function setTheme(theme: string, forceReload = false) {
  if (!isBrowser()) {
    return;
  }
  if (theme === "browser" && !forceReload) {
    return;
  }
  // This is only run on a force reload
  if (theme == "browser") {
    theme = "darkly";
  }

  let themeList = await fetchThemeList();

  // Unload all the other themes
  for (var i = 0; i < themeList.length; i++) {
    let styleSheet = document.getElementById(themeList[i]);
    if (styleSheet) {
      styleSheet.setAttribute("disabled", "disabled");
    }
  }

  document
    .getElementById("default-light")
    ?.setAttribute("disabled", "disabled");
  document.getElementById("default-dark")?.setAttribute("disabled", "disabled");

  // Load the theme dynamically
  let cssLoc = `/css/themes/${theme}.css`;

  loadCss(theme, cssLoc);
  document.getElementById(theme).removeAttribute("disabled");
}

export function loadCss(id: string, loc: string) {
  if (!document.getElementById(id)) {
    var head = document.getElementsByTagName("head")[0];
    var link = document.createElement("link");
    link.id = id;
    link.rel = "stylesheet";
    link.type = "text/css";
    link.href = loc;
    link.media = "all";
    head.appendChild(link);
  }
}

export function objectFlip(obj: any) {
  const ret = {};
  Object.keys(obj).forEach(key => {
    ret[obj[key]] = key;
  });
  return ret;
}

export function showAvatars(
  myUserInfo: Option<MyUserInfo> = UserService.Instance.myUserInfo
): boolean {
  return myUserInfo
    .map(m => m.local_user_view.local_user.show_avatars)
    .unwrapOr(true);
}

export function showScores(
  myUserInfo: Option<MyUserInfo> = UserService.Instance.myUserInfo
): boolean {
  return myUserInfo
    .map(m => m.local_user_view.local_user.show_scores)
    .unwrapOr(true);
}

export function isCakeDay(published: string): boolean {
  // moment(undefined) or moment.utc(undefined) returns the current date/time
  // moment(null) or moment.utc(null) returns null
  const createDate = moment.utc(published).local();
  const currentDate = moment(new Date());

  return (
    createDate.date() === currentDate.date() &&
    createDate.month() === currentDate.month() &&
    createDate.year() !== currentDate.year()
  );
}

export function toast(text: string, background = "success") {
  if (isBrowser()) {
    let backgroundColor = `var(--${background})`;
    Toastify({
      text: text,
      backgroundColor: backgroundColor,
      gravity: "bottom",
      position: "left",
    }).showToast();
  }
}

export function pictrsDeleteToast(
  clickToDeleteText: string,
  deletePictureText: string,
  failedDeletePictureText: string,
  deleteUrl: string
) {
  if (isBrowser()) {
    let backgroundColor = `var(--light)`;
    let toast = Toastify({
      text: clickToDeleteText,
      backgroundColor: backgroundColor,
      gravity: "top",
      position: "right",
      duration: 10000,
      onClick: () => {
        if (toast) {
          fetch(deleteUrl).then(res => {
            toast.hideToast();
            if (res.ok === true) {
              alert(deletePictureText);
            } else {
              alert(failedDeletePictureText);
            }
          });
        }
      },
      close: true,
    }).showToast();
  }
}

interface NotifyInfo {
  name: string;
  icon: Option<string>;
  link: string;
  body: string;
}

export function messageToastify(info: NotifyInfo, router: any) {
  if (isBrowser()) {
    let htmlBody = info.body ? md.render(info.body) : "";
    let backgroundColor = `var(--light)`;

    let toast = Toastify({
      text: `${htmlBody}<br />${info.name}`,
      avatar: info.icon,
      backgroundColor: backgroundColor,
      className: "text-dark",
      close: true,
      gravity: "top",
      position: "right",
      duration: 5000,
      escapeMarkup: false,
      onClick: () => {
        if (toast) {
          toast.hideToast();
          router.history.push(info.link);
        }
      },
    }).showToast();
  }
}

export function notifyPost(post_view: PostView, router: any) {
  let info: NotifyInfo = {
    name: post_view.community.name,
    icon: post_view.community.icon,
    link: `/post/${post_view.post.id}`,
    body: post_view.post.name,
  };
  notify(info, router);
}

export function notifyComment(comment_view: CommentView, router: any) {
  let info: NotifyInfo = {
    name: comment_view.creator.name,
    icon: comment_view.creator.avatar,
    link: `/comment/${comment_view.comment.id}`,
    body: comment_view.comment.content,
  };
  notify(info, router);
}

export function notifyPrivateMessage(pmv: PrivateMessageView, router: any) {
  let info: NotifyInfo = {
    name: pmv.creator.name,
    icon: pmv.creator.avatar,
    link: `/inbox`,
    body: pmv.private_message.content,
  };
  notify(info, router);
}

function notify(info: NotifyInfo, router: any) {
  messageToastify(info, router);

  if (Notification.permission !== "granted") Notification.requestPermission();
  else {
    var notification = new Notification(info.name, {
      ...{ body: info.body },
      ...(info.icon.isSome() && { icon: info.icon.unwrap() }),
    });

    notification.onclick = (ev: Event): any => {
      ev.preventDefault();
      router.history.push(info.link);
    };
  }
}

export function setupTribute() {
  return new Tribute({
    noMatchTemplate: function () {
      return "";
    },
    collection: [
      // Emojis
      {
        trigger: ":",
        menuItemTemplate: (item: any) => {
          let shortName = `:${item.original.key}:`;
          return `${item.original.val} ${shortName}`;
        },
        selectTemplate: (item: any) => {
          return `${item.original.val}`;
        },
        values: Object.entries(emojiShortName).map(e => {
          return { key: e[1], val: e[0] };
        }),
        allowSpaces: false,
        autocompleteMode: true,
        // TODO
        // menuItemLimit: mentionDropdownFetchLimit,
        menuShowMinLength: 2,
      },
      // Persons
      {
        trigger: "@",
        selectTemplate: (item: any) => {
          let it: PersonTribute = item.original;
          return `[${it.key}](${it.view.person.actor_id})`;
        },
        values: debounce(async (text: string, cb: any) => {
          cb(await personSearch(text));
        }),
        allowSpaces: false,
        autocompleteMode: true,
        // TODO
        // menuItemLimit: mentionDropdownFetchLimit,
        menuShowMinLength: 2,
      },

      // Communities
      {
        trigger: "!",
        selectTemplate: (item: any) => {
          let it: CommunityTribute = item.original;
          return `[${it.key}](${it.view.community.actor_id})`;
        },
        values: debounce(async (text: string, cb: any) => {
          cb(await communitySearch(text));
        }),
        allowSpaces: false,
        autocompleteMode: true,
        // TODO
        // menuItemLimit: mentionDropdownFetchLimit,
        menuShowMinLength: 2,
      },
    ],
  });
}

var tippyInstance: any;
if (isBrowser()) {
  tippyInstance = tippy("[data-tippy-content]");
}

export function setupTippy() {
  if (isBrowser()) {
    tippyInstance.forEach((e: any) => e.destroy());
    tippyInstance = tippy("[data-tippy-content]", {
      delay: [500, 0],
      // Display on "long press"
      touch: ["hold", 500],
    });
  }
}

interface PersonTribute {
  key: string;
  view: PersonViewSafe;
}

async function personSearch(text: string): Promise<PersonTribute[]> {
  let users = (await fetchUsers(text)).users;
  let persons: PersonTribute[] = users.map(pv => {
    let tribute: PersonTribute = {
      key: `@${pv.person.name}@${hostname(pv.person.actor_id)}`,
      view: pv,
    };
    return tribute;
  });
  return persons;
}

interface CommunityTribute {
  key: string;
  view: CommunityView;
}

async function communitySearch(text: string): Promise<CommunityTribute[]> {
  let comms = (await fetchCommunities(text)).communities;
  let communities: CommunityTribute[] = comms.map(cv => {
    let tribute: CommunityTribute = {
      key: `!${cv.community.name}@${hostname(cv.community.actor_id)}`,
      view: cv,
    };
    return tribute;
  });
  return communities;
}

export function getListingTypeFromProps(
  props: any,
  defaultListingType: ListingType,
  myUserInfo = UserService.Instance.myUserInfo
): ListingType {
  return props.match.params.listing_type
    ? routeListingTypeToEnum(props.match.params.listing_type)
    : myUserInfo.match({
        some: me =>
          Object.values(ListingType)[
            me.local_user_view.local_user.default_listing_type
          ],
        none: defaultListingType,
      });
}

export function getListingTypeFromPropsNoDefault(props: any): ListingType {
  return props.match.params.listing_type
    ? routeListingTypeToEnum(props.match.params.listing_type)
    : ListingType.Local;
}

export function getDataTypeFromProps(props: any): DataType {
  return props.match.params.data_type
    ? routeDataTypeToEnum(props.match.params.data_type)
    : DataType.Post;
}

export function getSortTypeFromProps(
  props: any,
  myUserInfo = UserService.Instance.myUserInfo
): SortType {
  return props.match.params.sort
    ? routeSortTypeToEnum(props.match.params.sort)
    : myUserInfo.match({
        some: mui =>
          Object.values(SortType)[
            mui.local_user_view.local_user.default_sort_type
          ],
        none: SortType.Active,
      });
}

export function getPageFromProps(props: any): number {
  return props.match.params.page ? Number(props.match.params.page) : 1;
}

export function getRecipientIdFromProps(props: any): number {
  return props.match.params.recipient_id
    ? Number(props.match.params.recipient_id)
    : 1;
}

export function getIdFromProps(props: any): Option<number> {
  let id: string = props.match.params.post_id;
  return id ? Some(Number(id)) : None;
}

export function getCommentIdFromProps(props: any): Option<number> {
  let id: string = props.match.params.comment_id;
  return id ? Some(Number(id)) : None;
}

export function getUsernameFromProps(props: any): string {
  return props.match.params.username;
}

export function editCommentRes(data: CommentView, comments: CommentView[]) {
  let found = comments.find(c => c.comment.id == data.comment.id);
  if (found) {
    found.comment.content = data.comment.content;
    found.comment.distinguished = data.comment.distinguished;
    found.comment.updated = data.comment.updated;
    found.comment.removed = data.comment.removed;
    found.comment.deleted = data.comment.deleted;
    found.counts.upvotes = data.counts.upvotes;
    found.counts.downvotes = data.counts.downvotes;
    found.counts.score = data.counts.score;
  }
}

export function saveCommentRes(data: CommentView, comments: CommentView[]) {
  let found = comments.find(c => c.comment.id == data.comment.id);
  if (found) {
    found.saved = data.saved;
  }
}

// TODO Should only use the return now, no state?
export function updatePersonBlock(
  data: BlockPersonResponse,
  myUserInfo = UserService.Instance.myUserInfo
): Option<PersonBlockView[]> {
  return myUserInfo.match({
    some: (mui: MyUserInfo) => {
      if (data.blocked) {
        mui.person_blocks.push({
          person: mui.local_user_view.person,
          target: data.person_view.person,
        });
        toast(`${i18n.t("blocked")} ${data.person_view.person.name}`);
      } else {
        mui.person_blocks = mui.person_blocks.filter(
          i => i.target.id != data.person_view.person.id
        );
        toast(`${i18n.t("unblocked")} ${data.person_view.person.name}`);
      }
      return Some(mui.person_blocks);
    },
    none: None,
  });
}

export function updateCommunityBlock(
  data: BlockCommunityResponse,
  myUserInfo = UserService.Instance.myUserInfo
): Option<CommunityBlockView[]> {
  return myUserInfo.match({
    some: (mui: MyUserInfo) => {
      if (data.blocked) {
        mui.community_blocks.push({
          person: mui.local_user_view.person,
          community: data.community_view.community,
        });
        toast(`${i18n.t("blocked")} ${data.community_view.community.name}`);
      } else {
        mui.community_blocks = mui.community_blocks.filter(
          i => i.community.id != data.community_view.community.id
        );
        toast(`${i18n.t("unblocked")} ${data.community_view.community.name}`);
      }
      return Some(mui.community_blocks);
    },
    none: None,
  });
}

export function createCommentLikeRes(
  data: CommentView,
  comments: CommentView[]
) {
  let found = comments.find(c => c.comment.id === data.comment.id);
  if (found) {
    found.counts.score = data.counts.score;
    found.counts.upvotes = data.counts.upvotes;
    found.counts.downvotes = data.counts.downvotes;
    if (data.my_vote !== null) {
      found.my_vote = data.my_vote;
    }
  }
}

export function createPostLikeFindRes(data: PostView, posts: PostView[]) {
  let found = posts.find(p => p.post.id == data.post.id);
  if (found) {
    createPostLikeRes(data, found);
  }
}

export function createPostLikeRes(data: PostView, post_view: PostView) {
  if (post_view) {
    post_view.counts.score = data.counts.score;
    post_view.counts.upvotes = data.counts.upvotes;
    post_view.counts.downvotes = data.counts.downvotes;
    if (data.my_vote !== null) {
      post_view.my_vote = data.my_vote;
    }
  }
}

export function editPostFindRes(data: PostView, posts: PostView[]) {
  let found = posts.find(p => p.post.id == data.post.id);
  if (found) {
    editPostRes(data, found);
  }
}

export function editPostRes(data: PostView, post: PostView) {
  if (post) {
    post.post.url = data.post.url;
    post.post.name = data.post.name;
    post.post.nsfw = data.post.nsfw;
    post.post.deleted = data.post.deleted;
    post.post.removed = data.post.removed;
    post.post.stickied = data.post.stickied;
    post.post.body = data.post.body;
    post.post.locked = data.post.locked;
    post.saved = data.saved;
  }
}

// TODO possible to make these generic?
export function updatePostReportRes(
  data: PostReportView,
  reports: PostReportView[]
) {
  let found = reports.find(p => p.post_report.id == data.post_report.id);
  if (found) {
    found.post_report = data.post_report;
  }
}

export function updateCommentReportRes(
  data: CommentReportView,
  reports: CommentReportView[]
) {
  let found = reports.find(c => c.comment_report.id == data.comment_report.id);
  if (found) {
    found.comment_report = data.comment_report;
  }
}

export function updatePrivateMessageReportRes(
  data: PrivateMessageReportView,
  reports: PrivateMessageReportView[]
) {
  let found = reports.find(
    c => c.private_message_report.id == data.private_message_report.id
  );
  if (found) {
    found.private_message_report = data.private_message_report;
  }
}

export function updateRegistrationApplicationRes(
  data: RegistrationApplicationView,
  applications: RegistrationApplicationView[]
) {
  let found = applications.find(
    ra => ra.registration_application.id == data.registration_application.id
  );
  if (found) {
    found.registration_application = data.registration_application;
    found.admin = data.admin;
    found.creator_local_user = data.creator_local_user;
  }
}

export function commentsToFlatNodes(comments: CommentView[]): CommentNodeI[] {
  let nodes: CommentNodeI[] = [];
  for (let comment of comments) {
    nodes.push({ comment_view: comment, children: [], depth: 0 });
  }
  return nodes;
}

export function convertCommentSortType(sort: SortType): CommentSortType {
  if (
    sort == SortType.TopAll ||
    sort == SortType.TopDay ||
    sort == SortType.TopWeek ||
    sort == SortType.TopMonth ||
    sort == SortType.TopYear
  ) {
    return CommentSortType.Top;
  } else if (sort == SortType.New) {
    return CommentSortType.New;
  } else if (sort == SortType.Hot || sort == SortType.Active) {
    return CommentSortType.Hot;
  } else {
    return CommentSortType.Hot;
  }
}

export function buildCommentsTree(
  comments: CommentView[],
  parentComment: boolean
): CommentNodeI[] {
  let map = new Map<number, CommentNodeI>();
  let depthOffset = !parentComment
    ? 0
    : getDepthFromComment(comments[0].comment);

  for (let comment_view of comments) {
    let node: CommentNodeI = {
      comment_view: comment_view,
      children: [],
      depth: getDepthFromComment(comment_view.comment) - depthOffset,
    };
    map.set(comment_view.comment.id, { ...node });
  }

  let tree: CommentNodeI[] = [];

  // if its a parent comment fetch, then push the first comment to the top node.
  if (parentComment) {
    tree.push(map.get(comments[0].comment.id));
  }

  for (let comment_view of comments) {
    let child = map.get(comment_view.comment.id);
    let parent_id = getCommentParentId(comment_view.comment);
    parent_id.match({
      some: parentId => {
        let parent = map.get(parentId);
        // Necessary because blocked comment might not exist
        if (parent) {
          parent.children.push(child);
        }
      },
      none: () => {
        if (!parentComment) {
          tree.push(child);
        }
      },
    });
  }

  return tree;
}

export function getCommentParentId(comment: CommentI): Option<number> {
  let split = comment.path.split(".");
  // remove the 0
  split.shift();

  if (split.length > 1) {
    return Some(Number(split[split.length - 2]));
  } else {
    return None;
  }
}

export function getDepthFromComment(comment: CommentI): number {
  return comment.path.split(".").length - 2;
}

export function insertCommentIntoTree(
  tree: CommentNodeI[],
  cv: CommentView,
  parentComment: boolean
) {
  // Building a fake node to be used for later
  let node: CommentNodeI = {
    comment_view: cv,
    children: [],
    depth: 0,
  };

  getCommentParentId(cv.comment).match({
    some: parentId => {
      let parentComment = searchCommentTree(tree, parentId);
      parentComment.match({
        some: pComment => {
          node.depth = pComment.depth + 1;
          pComment.children.unshift(node);
        },
        none: void 0,
      });
    },
    none: () => {
      if (!parentComment) {
        tree.unshift(node);
      }
    },
  });
}

export function searchCommentTree(
  tree: CommentNodeI[],
  id: number
): Option<CommentNodeI> {
  for (let node of tree) {
    if (node.comment_view.comment.id === id) {
      return Some(node);
    }

    for (const child of node.children) {
      let res = searchCommentTree([child], id);

      if (res.isSome()) {
        return res;
      }
    }
  }
  return None;
}

export const colorList: string[] = [
  hsl(0),
  hsl(50),
  hsl(100),
  hsl(150),
  hsl(200),
  hsl(250),
  hsl(300),
];

function hsl(num: number) {
  return `hsla(${num}, 35%, 50%, 1)`;
}

export function hostname(url: string): string {
  let cUrl = new URL(url);
  return cUrl.port ? `${cUrl.hostname}:${cUrl.port}` : `${cUrl.hostname}`;
}

export function validTitle(title?: string): boolean {
  // Initial title is null, minimum length is taken care of by textarea's minLength={3}
  if (!title || title.length < 3) return true;

  const regex = new RegExp(/.*\S.*/, "g");

  return regex.test(title);
}

export function siteBannerCss(banner: string): string {
  return ` \
    background-image: linear-gradient( rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8) ) ,url("${banner}"); \
    background-attachment: fixed; \
    background-position: top; \
    background-repeat: no-repeat; \
    background-size: 100% cover; \

    width: 100%; \
    max-height: 100vh; \
    `;
}

export function isBrowser() {
  return typeof window !== "undefined";
}

export function setIsoData<Type1, Type2, Type3, Type4, Type5>(
  context: any,
  cls1?: ClassConstructor<Type1>,
  cls2?: ClassConstructor<Type2>,
  cls3?: ClassConstructor<Type3>,
  cls4?: ClassConstructor<Type4>,
  cls5?: ClassConstructor<Type5>
): IsoData {
  // If its the browser, you need to deserialize the data from the window
  if (isBrowser()) {
    let json = window.isoData;
    let routeData = json.routeData;
    let routeDataOut: any[] = [];

    // Can't do array looping because of specific type constructor required
    if (routeData[0]) {
      routeDataOut[0] = convertWindowJson(cls1, routeData[0]);
    }
    if (routeData[1]) {
      routeDataOut[1] = convertWindowJson(cls2, routeData[1]);
    }
    if (routeData[2]) {
      routeDataOut[2] = convertWindowJson(cls3, routeData[2]);
    }
    if (routeData[3]) {
      routeDataOut[3] = convertWindowJson(cls4, routeData[3]);
    }
    if (routeData[4]) {
      routeDataOut[4] = convertWindowJson(cls5, routeData[4]);
    }
    let site_res = convertWindowJson(GetSiteResponse, json.site_res);

    let isoData: IsoData = {
      path: json.path,
      site_res,
      routeData: routeDataOut,
    };
    return isoData;
  } else return context.router.staticContext;
}

/**
 * Necessary since window ISOData can't store function types like Option
 */
export function convertWindowJson<T>(cls: ClassConstructor<T>, data: any): T {
  return deserialize(cls, serialize(data));
}

export function wsSubscribe(parseMessage: any): Subscription {
  if (isBrowser()) {
    return WebSocketService.Instance.subject
      .pipe(retryWhen(errors => errors.pipe(delay(3000), take(10))))
      .subscribe(
        msg => parseMessage(msg),
        err => console.error(err),
        () => console.log("complete")
      );
  } else {
    return null;
  }
}

moment.updateLocale("en", {
  relativeTime: {
    future: "in %s",
    past: "%s ago",
    s: "<1m",
    ss: "%ds",
    m: "1m",
    mm: "%dm",
    h: "1h",
    hh: "%dh",
    d: "1d",
    dd: "%dd",
    w: "1w",
    ww: "%dw",
    M: "1M",
    MM: "%dM",
    y: "1Y",
    yy: "%dY",
  },
});

export function saveScrollPosition(context: any) {
  let path: string = context.router.route.location.pathname;
  let y = window.scrollY;
  sessionStorage.setItem(`scrollPosition_${path}`, y.toString());
}

export function restoreScrollPosition(context: any) {
  let path: string = context.router.route.location.pathname;
  let y = Number(sessionStorage.getItem(`scrollPosition_${path}`));
  window.scrollTo(0, y);
}

export function showLocal(isoData: IsoData): boolean {
  return isoData.site_res.federated_instances
    .map(f => f.linked.length > 0)
    .unwrapOr(false);
}

export interface ChoicesValue {
  value: string;
  label: string;
}

export function communityToChoice(cv: CommunityView): ChoicesValue {
  let choice: ChoicesValue = {
    value: cv.community.id.toString(),
    label: communitySelectName(cv),
  };
  return choice;
}

export function personToChoice(pvs: PersonViewSafe): ChoicesValue {
  let choice: ChoicesValue = {
    value: pvs.person.id.toString(),
    label: personSelectName(pvs),
  };
  return choice;
}

export async function fetchCommunities(q: string) {
  let form = new Search({
    q,
    type_: Some(SearchType.Communities),
    sort: Some(SortType.TopAll),
    listing_type: Some(ListingType.All),
    page: Some(1),
    limit: Some(fetchLimit),
    community_id: None,
    community_name: None,
    creator_id: None,
    auth: auth(false).ok(),
  });
  let client = new LemmyHttp(httpBase);
  return client.search(form);
}

export async function fetchUsers(q: string) {
  let form = new Search({
    q,
    type_: Some(SearchType.Users),
    sort: Some(SortType.TopAll),
    listing_type: Some(ListingType.All),
    page: Some(1),
    limit: Some(fetchLimit),
    community_id: None,
    community_name: None,
    creator_id: None,
    auth: auth(false).ok(),
  });
  let client = new LemmyHttp(httpBase);
  return client.search(form);
}

export const choicesConfig = {
  shouldSort: false,
  searchResultLimit: fetchLimit,
  classNames: {
    containerOuter: "choices custom-select px-0",
    containerInner:
      "choices__inner bg-secondary border-0 py-0 modlog-choices-font-size",
    input: "form-control",
    inputCloned: "choices__input--cloned",
    list: "choices__list",
    listItems: "choices__list--multiple",
    listSingle: "choices__list--single py-0",
    listDropdown: "choices__list--dropdown",
    item: "choices__item bg-secondary",
    itemSelectable: "choices__item--selectable",
    itemDisabled: "choices__item--disabled",
    itemChoice: "choices__item--choice",
    placeholder: "choices__placeholder",
    group: "choices__group",
    groupHeading: "choices__heading",
    button: "choices__button",
    activeState: "is-active",
    focusState: "is-focused",
    openState: "is-open",
    disabledState: "is-disabled",
    highlightedState: "text-info",
    selectedState: "text-info",
    flippedState: "is-flipped",
    loadingState: "is-loading",
    noResults: "has-no-results",
    noChoices: "has-no-choices",
  },
};

export function communitySelectName(cv: CommunityView): string {
  return cv.community.local
    ? cv.community.title
    : `${hostname(cv.community.actor_id)}/${cv.community.title}`;
}

export function personSelectName(pvs: PersonViewSafe): string {
  let pName = pvs.person.display_name.unwrapOr(pvs.person.name);
  return pvs.person.local ? pName : `${hostname(pvs.person.actor_id)}/${pName}`;
}

export function initializeSite(site: GetSiteResponse) {
  UserService.Instance.myUserInfo = site.my_user;
  i18n.changeLanguage(getLanguages()[0]);
}

const SHORTNUM_SI_FORMAT = new Intl.NumberFormat("en-US", {
  maximumSignificantDigits: 3,
  //@ts-ignore
  notation: "compact",
  compactDisplay: "short",
});

export function numToSI(value: number): string {
  return SHORTNUM_SI_FORMAT.format(value);
}

export function isBanned(ps: PersonSafe): boolean {
  let expires = ps.ban_expires;
  // Add Z to convert from UTC date
  // TODO this check probably isn't necessary anymore
  if (expires.isSome()) {
    if (ps.banned && new Date(expires.unwrap() + "Z") > new Date()) {
      return true;
    } else {
      return false;
    }
  } else {
    return ps.banned;
  }
}

export function pushNotNull(array: any[], new_item?: any) {
  if (new_item) {
    array.push(...new_item);
  }
}

export function auth(throwErr = true): Result<string, string> {
  return UserService.Instance.auth(throwErr);
}

export function enableDownvotes(siteRes: GetSiteResponse): boolean {
  return siteRes.site_view.local_site.enable_downvotes;
}

export function enableNsfw(siteRes: GetSiteResponse): boolean {
  return siteRes.site_view.local_site.enable_nsfw;
}

export function postToCommentSortType(sort: SortType): CommentSortType {
  if ([SortType.Active, SortType.Hot].includes(sort)) {
    return CommentSortType.Hot;
  } else if ([SortType.New, SortType.NewComments].includes(sort)) {
    return CommentSortType.New;
  } else if (sort == SortType.Old) {
    return CommentSortType.Old;
  } else {
    return CommentSortType.Top;
  }
}

export function arrayGet<T>(arr: Array<T>, index: number): Result<T, string> {
  let out = arr.at(index);
  if (out == undefined) {
    return Err("Index undefined");
  } else {
    return Ok(out);
  }
}

export function myFirstDiscussionLanguageId(
  myUserInfo = UserService.Instance.myUserInfo
): Option<number> {
  return myUserInfo.andThen(mui =>
    arrayGet(mui.discussion_languages, 0)
      .ok()
      .map(i => i.id)
  );
}

export function canCreateCommunity(
  siteRes: GetSiteResponse,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  let adminOnly = siteRes.site_view.local_site.community_creation_admin_only;
  return !adminOnly || amAdmin(myUserInfo);
}

export function isPostBlocked(
  pv: PostView,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  return myUserInfo
    .map(
      mui =>
        mui.community_blocks
          .map(c => c.community.id)
          .includes(pv.community.id) ||
        mui.person_blocks.map(p => p.target.id).includes(pv.creator.id)
    )
    .unwrapOr(false);
}

/// Checks to make sure you can view NSFW posts. Returns true if you can.
export function nsfwCheck(
  pv: PostView,
  myUserInfo = UserService.Instance.myUserInfo
): boolean {
  let nsfw = pv.post.nsfw || pv.community.nsfw;
  return (
    !nsfw ||
    (nsfw &&
      myUserInfo
        .map(m => m.local_user_view.local_user.show_nsfw)
        .unwrapOr(false))
  );
}