lemmy-ui/src/shared/utils.ts

import emojiShortName from "emoji-short-name";
import {
  BlockCommunityResponse,
  BlockPersonResponse,
  CommentReportView,
  CommentView,
  CommunityBlockView,
  CommunityView,
  GetSiteMetadata,
  GetSiteResponse,
  LemmyHttp,
  LemmyWebsocket,
  ListingType,
  MyUserInfo,
  PersonBlockView,
  PersonViewSafe,
  PostReportView,
  PostView,
  PrivateMessageView,
  Search,
  SearchResponse,
  SearchType,
  SortType,
  UserOperation,
  WebSocketJsonResponse,
  WebSocketResponse,
} from "lemmy-js-client";
import markdown_it from "markdown-it";
import markdown_it_container from "markdown-it-container";
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 "moment/locale/bg";
import "moment/locale/bn";
import "moment/locale/ca";
import "moment/locale/cs";
import "moment/locale/cy";
import "moment/locale/da";
import "moment/locale/de";
import "moment/locale/el";
import "moment/locale/eo";
import "moment/locale/es";
import "moment/locale/eu";
import "moment/locale/fa";
import "moment/locale/fi";
import "moment/locale/fr";
import "moment/locale/ga";
import "moment/locale/gl";
import "moment/locale/hi";
import "moment/locale/hr";
import "moment/locale/hu";
import "moment/locale/id";
import "moment/locale/it";
import "moment/locale/ja";
import "moment/locale/ka";
import "moment/locale/km";
import "moment/locale/ko";
import "moment/locale/ml";
import "moment/locale/nb";
import "moment/locale/nl";
import "moment/locale/pl";
import "moment/locale/pt-br";
import "moment/locale/ru";
import "moment/locale/sk";
import "moment/locale/sq";
import "moment/locale/sr";
import "moment/locale/sv";
import "moment/locale/tr";
import "moment/locale/uk";
import "moment/locale/vi";
import "moment/locale/zh-cn";
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 } from "./i18next";
import {
  CommentNode as CommentNodeI,
  CommentSortType,
  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 = `${helpGuideUrl}#markdown-guide`;
export const sortingHelpUrl = `${helpGuideUrl}#sorting`;
export const archiveUrl = "https://archive.is";
export const elementUrl = "https://element.io";

export const postRefetchSeconds: number = 60 * 1000;
export const fetchLimit = 20;
export const mentionDropdownFetchLimit = 10;

export const languages = [
  { code: "ca" },
  { code: "en" },
  { code: "el" },
  { code: "eu" },
  { code: "eo" },
  { code: "es" },
  { code: "da" },
  { code: "de" },
  { code: "ga" },
  { code: "gl" },
  { code: "hr" },
  { code: "hu" },
  { code: "id" },
  { code: "ka" },
  { code: "ko" },
  { code: "km" },
  { code: "hi" },
  { code: "fa" },
  { code: "ja" },
  { code: "oc" },
  { code: "nb_NO" },
  { code: "pl" },
  { code: "pt_BR" },
  { code: "zh" },
  { code: "fi" },
  { code: "fr" },
  { code: "sv" },
  { code: "sq" },
  { code: "sr_Latn" },
  { code: "th" },
  { code: "tr" },
  { code: "uk" },
  { code: "ru" },
  { code: "nl" },
  { code: "it" },
  { code: "bg" },
  { code: "zh_Hant" },
  { code: "cy" },
  { code: "mnc" },
  { code: "sk" },
  { code: "vi" },
  { code: "pt" },
  { code: "ar" },
  { code: "bn" },
  { code: "ml" },
  { code: "cs" },
];

export const themes = [
  "litera",
  "materia",
  "minty",
  "solar",
  "united",
  "cyborg",
  "darkly",
  "journal",
  "sketchy",
  "vaporwave",
  "vaporwave-dark",
  "i386",
  "litely",
];

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 function wsJsonToRes<ResponseType>(
  msg: WebSocketJsonResponse<ResponseType>
): WebSocketResponse<ResponseType> {
  return {
    op: wsUserOp(msg),
    data: msg.data,
  };
}

export function wsUserOp(msg: any): UserOperation {
  let opStr: string = msg.op;
  return UserOperation[opStr];
}

export const md = new markdown_it({
  html: false,
  linkify: true,
  typographer: true,
})
  .use(markdown_it_sub)
  .use(markdown_it_sup)
  .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 getUnixTime(text: string): number {
  return text ? new Date(text).getTime() / 1000 : undefined;
}

export function canMod(
  myUserInfo: MyUserInfo,
  modIds: number[],
  creator_id: number,
  onSelf = false
): boolean {
  // You can do moderator actions only on the mods added after you.
  if (myUserInfo) {
    let yourIndex = modIds.findIndex(
      id => id == myUserInfo.local_user_view.person.id
    );
    if (yourIndex == -1) {
      return false;
    } else {
      // onSelf +1 on mod actions not for yourself, IE ban, remove, etc
      modIds = modIds.slice(0, yourIndex + (onSelf ? 0 : 1));
      return !modIds.includes(creator_id);
    }
  } else {
    return false;
  }
}

export function isMod(modIds: number[], creator_id: number): boolean {
  return modIds.includes(creator_id);
}

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

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: 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);
  };
}

// TODO
export function getLanguage(override?: string): string {
  let myUserInfo = UserService.Instance.myUserInfo;
  let lang =
    override ||
    (myUserInfo?.local_user_view.local_user.lang
      ? myUserInfo.local_user_view.local_user.lang
      : "browser");

  if (lang == "browser" && isBrowser()) {
    return getBrowserLanguage();
  } else {
    return lang;
  }
}

export function getBrowserLanguage(): 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[0];
}

export function getMomentLanguage(): string {
  let lang = getLanguage();
  if (lang.startsWith("zh")) {
    lang = "zh-cn";
  } else if (lang.startsWith("sv")) {
    lang = "sv";
  } else if (lang.startsWith("fr")) {
    lang = "fr";
  } else if (lang.startsWith("de")) {
    lang = "de";
  } else if (lang.startsWith("ru")) {
    lang = "ru";
  } else if (lang.startsWith("es")) {
    lang = "es";
  } else if (lang.startsWith("eo")) {
    lang = "eo";
  } else if (lang.startsWith("nl")) {
    lang = "nl";
  } else if (lang.startsWith("it")) {
    lang = "it";
  } else if (lang.startsWith("fi")) {
    lang = "fi";
  } else if (lang.startsWith("ca")) {
    lang = "ca";
  } else if (lang.startsWith("fa")) {
    lang = "fa";
  } else if (lang.startsWith("pl")) {
    lang = "pl";
  } else if (lang.startsWith("pt_BR")) {
    lang = "pt-br";
  } else if (lang.startsWith("ja")) {
    lang = "ja";
  } else if (lang.startsWith("ka")) {
    lang = "ka";
  } else if (lang.startsWith("hi")) {
    lang = "hi";
  } else if (lang.startsWith("el")) {
    lang = "el";
  } else if (lang.startsWith("eu")) {
    lang = "eu";
  } else if (lang.startsWith("gl")) {
    lang = "gl";
  } else if (lang.startsWith("tr")) {
    lang = "tr";
  } else if (lang.startsWith("hu")) {
    lang = "hu";
  } else if (lang.startsWith("uk")) {
    lang = "uk";
  } else if (lang.startsWith("sq")) {
    lang = "sq";
  } else if (lang.startsWith("km")) {
    lang = "km";
  } else if (lang.startsWith("ga")) {
    lang = "ga";
  } else if (lang.startsWith("sr")) {
    lang = "sr";
  } else if (lang.startsWith("ko")) {
    lang = "ko";
  } else if (lang.startsWith("da")) {
    lang = "da";
  } else if (lang.startsWith("oc")) {
    lang = "oc";
  } else if (lang.startsWith("hr")) {
    lang = "hr";
  } else if (lang.startsWith("th")) {
    lang = "th";
  } else if (lang.startsWith("bg")) {
    lang = "bg";
  } else if (lang.startsWith("id")) {
    lang = "id";
  } else if (lang.startsWith("nb")) {
    lang = "nb";
  } else if (lang.startsWith("cy")) {
    lang = "cy";
  } else if (lang.startsWith("sk")) {
    lang = "sk";
  } else if (lang.startsWith("vi")) {
    lang = "vi";
  } else if (lang.startsWith("pt")) {
    lang = "pt";
  } else if (lang.startsWith("ar")) {
    lang = "ar";
  } else if (lang.startsWith("bn")) {
    lang = "bn";
  } else if (lang.startsWith("ml")) {
    lang = "ml";
  } else if (lang.startsWith("cs")) {
    lang = "cs";
  } else {
    lang = "en";
  }
  return lang;
}

export 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";
  }

  // Unload all the other themes
  for (var i = 0; i < themes.length; i++) {
    let styleSheet = document.getElementById(themes[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 = `/static/assets/css/themes/${theme}.min.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(): boolean {
  return (
    UserService.Instance.myUserInfo?.local_user_view.local_user.show_avatars ||
    !UserService.Instance.myUserInfo
  );
}

export function showScores(): boolean {
  return (
    UserService.Instance.myUserInfo?.local_user_view.local_user.show_scores ||
    !UserService.Instance.myUserInfo
  );
}

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 || null).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,
  deleteUrl: string
) {
  if (isBrowser()) {
    let backgroundColor = `var(--light)`;
    let toast = Toastify({
      text: clickToDeleteText,
      backgroundColor: backgroundColor,
      gravity: "top",
      position: "right",
      duration: 10000,
      onClick: () => {
        if (toast) {
          window.location.replace(deleteUrl);
          alert(deletePictureText);
          toast.hideToast();
        }
      },
      close: true,
    }).showToast();
  }
}

interface NotifyInfo {
  name: string;
  icon?: 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 ? info.icon : null,
      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: `/post/${comment_view.post.id}/comment/${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);

  // TODO absolute nightmare bug, but notifs are currently broken.
  // Notification.new will try to do a browser fetch ???

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

  //   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: (text: string, cb: (persons: PersonTribute[]) => any) => {
          personSearch(text, (persons: PersonTribute[]) => cb(persons));
        },
        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: (text: string, cb: any) => {
          communitySearch(text, (communities: CommunityTribute[]) =>
            cb(communities)
          );
        },
        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;
}

function personSearch(text: string, cb: (persons: PersonTribute[]) => any) {
  if (text) {
    let form: Search = {
      q: text,
      type_: SearchType.Users,
      sort: SortType.TopAll,
      listing_type: ListingType.All,
      page: 1,
      limit: mentionDropdownFetchLimit,
      auth: authField(false),
    };

    WebSocketService.Instance.send(wsClient.search(form));

    let personSub = WebSocketService.Instance.subject.subscribe(
      msg => {
        let res = wsJsonToRes(msg);
        if (res.op == UserOperation.Search) {
          let data = res.data as SearchResponse;
          let persons: PersonTribute[] = data.users.map(pv => {
            let tribute: PersonTribute = {
              key: `@${pv.person.name}@${hostname(pv.person.actor_id)}`,
              view: pv,
            };
            return tribute;
          });
          cb(persons);
          personSub.unsubscribe();
        }
      },
      err => console.error(err),
      () => console.log("complete")
    );
  } else {
    cb([]);
  }
}

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

function communitySearch(
  text: string,
  cb: (communities: CommunityTribute[]) => any
) {
  if (text) {
    let form: Search = {
      q: text,
      type_: SearchType.Communities,
      sort: SortType.TopAll,
      listing_type: ListingType.All,
      page: 1,
      limit: mentionDropdownFetchLimit,
      auth: authField(false),
    };

    WebSocketService.Instance.send(wsClient.search(form));

    let communitySub = WebSocketService.Instance.subject.subscribe(
      msg => {
        let res = wsJsonToRes(msg);
        if (res.op == UserOperation.Search) {
          let data = res.data as SearchResponse;
          let communities: CommunityTribute[] = data.communities.map(cv => {
            let tribute: CommunityTribute = {
              key: `!${cv.community.name}@${hostname(cv.community.actor_id)}`,
              view: cv,
            };
            return tribute;
          });
          cb(communities);
          communitySub.unsubscribe();
        }
      },
      err => console.error(err),
      () => console.log("complete")
    );
  } else {
    cb([]);
  }
}

export function getListingTypeFromProps(props: any): ListingType {
  return props.match.params.listing_type
    ? routeListingTypeToEnum(props.match.params.listing_type)
    : UserService.Instance.myUserInfo
    ? Object.values(ListingType)[
        UserService.Instance.myUserInfo.local_user_view.local_user
          .default_listing_type
      ]
    : ListingType.Local;
}

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

// TODO might need to add a user setting for this too
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): SortType {
  return props.match.params.sort
    ? routeSortTypeToEnum(props.match.params.sort)
    : UserService.Instance.myUserInfo
    ? Object.values(SortType)[
        UserService.Instance.myUserInfo.local_user_view.local_user
          .default_sort_type
      ]
    : 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): number {
  return Number(props.match.params.id);
}

export function getCommentIdFromProps(props: any): number {
  return Number(props.match.params.comment_id);
}

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.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;
  }
}

export function updatePersonBlock(
  data: BlockPersonResponse
): PersonBlockView[] {
  if (data.blocked) {
    UserService.Instance.myUserInfo.person_blocks.push({
      person: UserService.Instance.myUserInfo.local_user_view.person,
      target: data.person_view.person,
    });
    toast(`${i18n.t("blocked")} ${data.person_view.person.name}`);
  } else {
    UserService.Instance.myUserInfo.person_blocks =
      UserService.Instance.myUserInfo.person_blocks.filter(
        i => i.target.id != data.person_view.person.id
      );
    toast(`${i18n.t("unblocked")} ${data.person_view.person.name}`);
  }
  return UserService.Instance.myUserInfo.person_blocks;
}

export function updateCommunityBlock(
  data: BlockCommunityResponse
): CommunityBlockView[] {
  if (data.blocked) {
    UserService.Instance.myUserInfo.community_blocks.push({
      person: UserService.Instance.myUserInfo.local_user_view.person,
      community: data.community_view.community,
    });
    toast(`${i18n.t("blocked")} ${data.community_view.community.name}`);
  } else {
    UserService.Instance.myUserInfo.community_blocks =
      UserService.Instance.myUserInfo.community_blocks.filter(
        i => i.community.id != data.community_view.community.id
      );
    toast(`${i18n.t("unblocked")} ${data.community_view.community.name}`);
  }
  return UserService.Instance.myUserInfo.community_blocks;
}

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;
  }
}

export function updatePostReportRes(
  data: PostReportView,
  reports: PostReportView[]
) {
  let found = reports.find(p => p.post.id == data.post.id);
  if (found) {
    found.post_report = data.post_report;
  }
}

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

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

function commentSort(tree: CommentNodeI[], sort: CommentSortType) {
  // First, put removed and deleted comments at the bottom, then do your other sorts
  if (sort == CommentSortType.Top) {
    tree.sort(
      (a, b) =>
        +a.comment_view.comment.removed - +b.comment_view.comment.removed ||
        +a.comment_view.comment.deleted - +b.comment_view.comment.deleted ||
        b.comment_view.counts.score - a.comment_view.counts.score
    );
  } else if (sort == CommentSortType.New) {
    tree.sort(
      (a, b) =>
        +a.comment_view.comment.removed - +b.comment_view.comment.removed ||
        +a.comment_view.comment.deleted - +b.comment_view.comment.deleted ||
        b.comment_view.comment.published.localeCompare(
          a.comment_view.comment.published
        )
    );
  } else if (sort == CommentSortType.Old) {
    tree.sort(
      (a, b) =>
        +a.comment_view.comment.removed - +b.comment_view.comment.removed ||
        +a.comment_view.comment.deleted - +b.comment_view.comment.deleted ||
        a.comment_view.comment.published.localeCompare(
          b.comment_view.comment.published
        )
    );
  } else if (sort == CommentSortType.Hot) {
    tree.sort(
      (a, b) =>
        +a.comment_view.comment.removed - +b.comment_view.comment.removed ||
        +a.comment_view.comment.deleted - +b.comment_view.comment.deleted ||
        hotRankComment(b.comment_view) - hotRankComment(a.comment_view)
    );
  }

  // Go through the children recursively
  for (let node of tree) {
    if (node.children) {
      commentSort(node.children, sort);
    }
  }
}

export function commentSortSortType(tree: CommentNodeI[], sort: SortType) {
  commentSort(tree, convertCommentSortType(sort));
}

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[],
  commentSortType: CommentSortType
): CommentNodeI[] {
  let map = new Map<number, CommentNodeI>();
  for (let comment_view of comments) {
    let node: CommentNodeI = {
      comment_view: comment_view,
      children: [],
    };
    map.set(comment_view.comment.id, { ...node });
  }
  let tree: CommentNodeI[] = [];
  for (let comment_view of comments) {
    let child = map.get(comment_view.comment.id);
    let parent_id = comment_view.comment.parent_id;
    if (parent_id) {
      let parent = map.get(parent_id);
      // Necessary because blocked comment might not exist
      if (parent) {
        parent.children.push(child);
      }
    } else {
      tree.push(child);
    }

    setDepth(child);
  }

  commentSort(tree, commentSortType);

  return tree;
}

function setDepth(node: CommentNodeI, i = 0) {
  for (let child of node.children) {
    child.depth = i;
    setDepth(child, i + 1);
  }
}

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

  if (cv.comment.parent_id) {
    let parentComment = searchCommentTree(tree, cv.comment.parent_id);
    if (parentComment) {
      node.depth = parentComment.depth + 1;
      parentComment.children.unshift(node);
    }
  } else {
    tree.unshift(node);
  }
}

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

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

      if (res) {
        return res;
      }
    }
  }
  return null;
}

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

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

export function previewLines(
  text: string,
  maxChars = 300,
  maxLines = 1
): string {
  return (
    text
      .slice(0, maxChars)
      .split("\n")
      // Use lines * 2 because markdown requires 2 lines
      .slice(0, maxLines * 2)
      .join("\n") + "..."
  );
}

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 === null || 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(context: any): IsoData {
  let isoData: IsoData = isBrowser()
    ? window.isoData
    : context.router.staticContext;
  return isoData;
}

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;
  }
}

export function setOptionalAuth(obj: any, auth = UserService.Instance.auth) {
  if (auth) {
    obj.auth = auth;
  }
}

export function authField(
  throwErr = true,
  auth = UserService.Instance.auth
): string {
  if (auth == null && throwErr) {
    toast(i18n.t("not_logged_in"), "danger");
    throw "Not logged in";
  } else {
    return auth;
  }
}

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?.linked.length > 0;
}

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: Search = {
    q,
    type_: SearchType.Communities,
    sort: SortType.TopAll,
    listing_type: ListingType.All,
    page: 1,
    limit: fetchLimit,
    auth: authField(false),
  };
  let client = new LemmyHttp(httpBase);
  return client.search(form);
}

export async function fetchUsers(q: string) {
  let form: Search = {
    q,
    type_: SearchType.Users,
    sort: SortType.TopAll,
    listing_type: ListingType.All,
    page: 1,
    limit: fetchLimit,
    auth: authField(false),
  };
  let client = new LemmyHttp(httpBase);
  return client.search(form);
}

export const choicesConfig = {
  shouldSort: false,
  searchResultLimit: fetchLimit,
  classNames: {
    containerOuter: "choices",
    containerInner: "choices__inner bg-secondary border-0",
    input: "form-control",
    inputCloned: "choices__input--cloned",
    list: "choices__list",
    listItems: "choices__list--multiple",
    listSingle: "choices__list--single",
    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.name
    : `${hostname(cv.community.actor_id)}/${cv.community.name}`;
}

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

export function initializeSite(site: GetSiteResponse) {
  UserService.Instance.myUserInfo = site.my_user;
  i18n.changeLanguage(getLanguage());
}

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);
}