/**
 * Modified version of https://unpkg.com/twemoji@13.1.0/dist/twemoji.esm.js.
 * Ported from https://github.com/vercel/satori/blob/48aea6f812365959c2888a25261c72ce17992c6d/playground/utils/twemoji.ts.
 */

/*! Copyright Twitter Inc. and other contributors. Licensed under MIT */

const U200D = String.fromCharCode(8205)
const UFE0Fg = /\uFE0F/g

export function getIconCode(char: string) {
  return toCodePoint(char.indexOf(U200D) < 0 ? char.replace(UFE0Fg, "") : char)
}

function toCodePoint(unicodeSurrogates: string) {
  const r = []
  let c = 0,
    p = 0,
    i = 0

  while (i < unicodeSurrogates.length) {
    c = unicodeSurrogates.charCodeAt(i++)
    if (p) {
      r.push((65536 + ((p - 55296) << 10) + (c - 56320)).toString(16))
      p = 0
    } else if (55296 <= c && c <= 56319) {
      p = c
    } else {
      r.push(c.toString(16))
    }
  }
  return r.join("-")
}

export const apis = {
  twemoji: (code: string) =>
    "https://cdnjs.cloudflare.com/ajax/libs/twemoji/15.1.0/svg/" + code.toLowerCase() + ".svg",
  openmoji: "https://cdn.jsdelivr.net/npm/@svgmoji/openmoji@3.2.0/svg/",
  blobmoji: "https://cdn.jsdelivr.net/npm/@svgmoji/blob@3.2.0/svg/",
  noto: "https://cdn.jsdelivr.net/gh/svgmoji/svgmoji/packages/svgmoji__noto/svg/",
  fluent: (code: string) =>
    "https://cdn.jsdelivr.net/gh/shuding/fluentui-emoji-unicode/assets/" +
    code.toLowerCase() +
    "_color.svg",
  fluentFlat: (code: string) =>
    "https://cdn.jsdelivr.net/gh/shuding/fluentui-emoji-unicode/assets/" +
    code.toLowerCase() +
    "_flat.svg",
}

const emojiCache: Record<string, Promise<any>> = {}

export function loadEmoji(type: keyof typeof apis, code: string) {
  const key = type + ":" + code
  if (key in emojiCache) return emojiCache[key]

  if (!type || !apis[type]) {
    type = "twemoji"
  }

  const api = apis[type]
  if (typeof api === "function") {
    return (emojiCache[key] = fetch(api(code)).then((r) => r.text()))
  }
  return (emojiCache[key] = fetch(`${api}${code.toUpperCase()}.svg`).then((r) => r.text()))
}