import _emoji from 'twemoji';

import { FACE_ASSETS } from '../assets';
import { FACE_ASSETS_UTF16 } from '../biz/EmojiList/EmojiList.const';

/**
 * Convert text into emoji text.
 *
 * @param text Text with original symbols.
 * @returns Text with emoji symbols.
 *
 * @example
 *
 * input: U+1F644U+1F910U+1F644U+1F62DU+1F610U+1F610U+1F62DU+1F610U+1F62DU+1F610U+1F62DU+1F641U+1F641U+1F62DU+1F641U+1F62DU+1F62DU+1F610iknbbvvjbff
 *
 * output: 🙄🤐🙄😭😐😐😭😐😭😐😭🙁🙁😭🙁😭😭😐iknbbvvjbff
 */
function toCodePointText(text: string): string {
  let tmp = text;
  for (const key of gEmojiList) {
    // tmp.replaceAll(key, _emoji.convert.fromCodePoint(key.substring(2)));
    const keyTmp = key.replace('+', '\\+');
    tmp = tmp.replace(
      new RegExp(keyTmp, 'g'),
      _emoji.convert.fromCodePoint(key.substring(2))
    );
  }
  return tmp;
}

/**
 * Convert emoji text into text. Just the opposite of `toCodePointText`.
 * @param text Text with emoji symbols.
 * @returns Text with original symbols.
 *
 * @example
 *
 * input: 🙄🤐🙄😭😐😐😭😐😭😐😭🙁🙁😭🙁😭😭😐iknbbvvjbff
 *
 * output: U+1F644U+1F910U+1F644U+1F62DU+1F610U+1F610U+1F62DU+1F610U+1F62DU+1F610U+1F62DU+1F641U+1F641U+1F62DU+1F641U+1F62DU+1F62DU+1F610iknbbvvjbff
 */
function fromCodePointText(text: string): string {
  let tmp = text;
  for (const key of gEmojiListUTF16) {
    tmp = tmp.replace(
      new RegExp(key, 'g'),
      'U+' + _emoji.convert.toCodePoint(key).toUpperCase()
    );
  }
  return tmp;
}

let gEmojiList = FACE_ASSETS;
let gEmojiListUTF16 = FACE_ASSETS_UTF16;

/**
 * If you want to use a custom emoticon, calling this method will replace the built-in default emoticon list.
 *
 * @param list The list of emoji expressions. {@link FACE_ASSETS}
 */
function setEmojiList(list: string[]) {
  gEmojiList = list;
  gEmojiListUTF16 = gEmojiList.map((v) => {
    return _emoji.convert.fromCodePoint(v.substring(2));
  });
}

export const emoji = {
  toCodePointText: toCodePointText,
  fromCodePointText: fromCodePointText,
  setEmojiList: setEmojiList,
};