cuubot/src/functions/meme.ts

/* eslint-disable import/prefer-default-export */

import { GuildEmoji, Message } from 'discord.js';
import { readFile } from 'fs/promises';

type TextReply = {
  keywords: (string | string[])[],
  emojiName?: string[],
  content?: string,
}

export const listenForKeywordsAndReply = async (message: Message): Promise<void> => {
  const repliesBuffer = await readFile('.text-replies.json');
  const repliesString = repliesBuffer.toString('utf-8');
  const replies = JSON.parse(repliesString) as TextReply[];
  const theReply = replies.reduce<TextReply | null>(
    (chosenReply, reply) => {
      if (chosenReply === null && reply.keywords.some((t) => {
        if (Array.isArray(t)) {
          return t.every((tt) => message.content === tt);
        }
        return message.content === t;
      })) {
        return reply;
      }
      return chosenReply;
    },
    null,
  );

  if (theReply) {
    const emojiNames = theReply.emojiName;
    if (emojiNames) {
      const emojis = emojiNames
        .map((emName) => (
          message.guild?.emojis.cache.find((em) => em.name === emName)
        ))
        .filter((em) => Boolean(em)) as GuildEmoji[];

      await Promise.all(emojis.map((em) => message.react(em)));
    }
    if (theReply.content) {
      await message.channel.send(theReply.content);
    }
  }
};