soapbox/app/gabsocial/utils/emoji_reacts.js

import {
  Map as ImmutableMap,
  List as ImmutableList,
} from 'immutable';

// https://emojipedia.org/facebook/
export const ALLOWED_EMOJI = [
  '👍',
  '❤',
  '😂',
  '😯',
  '😢',
  '😡',
];

export const sortEmoji = emojiReacts => (
  emojiReacts.sortBy(emojiReact => -emojiReact.get('count'))
);

export const mergeEmoji = emojiReacts => (
  emojiReacts // TODO: Merge similar emoji
);

export const mergeEmojiFavourites = (emojiReacts, favouritesCount) => {
  if (!favouritesCount) return emojiReacts;
  const likeIndex = emojiReacts.findIndex(emojiReact =>
    emojiReact.get('name') === '👍');
  if (likeIndex > -1) {
    const likeCount = emojiReacts.getIn([likeIndex, 'count']);
    return emojiReacts.setIn([likeIndex, 'count'], likeCount + favouritesCount);
  } else {
    return emojiReacts.push(ImmutableMap({ count: favouritesCount, me: false, name: '👍' }));
  }
};

export const oneEmojiPerAccount = emojiReacts => {
  emojiReacts = emojiReacts.reverse();
  return emojiReacts.reduce((acc, cur) => {
    if (acc.filter(
      e => e.get('me') && e.get('name') !== cur.get('name')
    ).length > 0) return acc.delete(cur); // FIXME: Incomplete
    return acc;
  }, emojiReacts).reverse();
};

export const filterEmoji = emojiReacts => (
  emojiReacts.filter(emojiReact => (
    ALLOWED_EMOJI.includes(emojiReact.get('name'))
  )));

export const reduceEmoji = (emojiReacts, favouritesCount) => (
  sortEmoji(filterEmoji(mergeEmoji(mergeEmojiFavourites(
    emojiReacts, favouritesCount
  )))));

export const getReactForStatus = status => {
  const emojiReacts = status.getIn(['pleroma', 'emoji_reactions'], ImmutableList());
  const emojiReact = emojiReacts.reduce((acc, cur) => {
    if (acc) return acc;
    if (cur.get('me') === true) return cur.get('name');
    return acc;
  }, false);
  return emojiReact ? emojiReact : status.get('favourited') && '👍';
};