import { useStatusBar } from "../scrapbox-userscript-std/dom.ts";
import { getWebPageTitle, getTweetInfo } from "../scrapbox-userscript-std/rest.ts";
import type { TweetInfo } from "../scrapbox-jp%2Ftypes/rest.ts";

const checkRegExp = /(https?:\/\/\S+)/;
export const hasURL = (text: string): boolean => checkRegExp.test(text);

export const convert = async (text: string): Promise<string> => {
  if (!hasURL(text)) return text;
  
  const { render, dispose } = useStatusBar();
  
  render(
    { type: "spinner" },
    { type: "text", text: "convert URLs..."},
  );
  let count = 0;
  try {
    const result = await Promise.all(
      text.split(checkRegExp).map(async (fragment) => {
        if (!/^https?:\/\/\S+/.test(fragment)) return fragment;
        
        let url: URL;
        try {
          url = new URL(fragment);
        } catch(e: unknown) {
          if (e instanceof TypeError) return fragment;
          throw e;
        }
        
        if (isTwitterURL(url)) {
          const result = await getTweetInfo(url);
          if (!result.ok) return fragment;
          count++;
          return formatTweet(url, result.value);
        }
        const result = await getWebPageTitle(url);
        if (!result.ok) return fragment;
        count++;
        const title = result.value
          .replace(/\s/g, " ") // スペースと改行を全て半角スペースにする
          .replaceAll("[", "［")
          .replaceAll("]", "］");
        return `[${url} ${title}]`;
      })
    );
    
    render(
      { type: "check-circle" },
      { type: "text", text: `Converted ${count} URLs.`},
    );
    return result.join("");
  } catch(e: unknown) {
    render(
      { type: "exclamation-triangle" },
      { type: "text", text: e instanceof Error ?
        `${e.name} ${e.message}` :
        `Unknown error! (see developper console)`,
      },
    );
    console.error(e);
    throw e;
  } finally {
    setTimeout(() => dispose(), 1000);
  }
};

const isTwitterURL = (url: string | URL) =>
  /^https:\/\/(?:www\.|mobile\.|m\.|)twitter\.com\/([A-Za-z0-9_]*)\/(?:status|statuses)\/\d+/.test(url.toString());
const escapeForEmbed = (text: string) => text
  .replace(/\b/gm, "")
  .replace(/[\s\r\n\u2028\u2029]+/gm, " ")
  .replace(/\s*[[\]`]\s*/g, " ")
  .trim();

const formatTweet = (url: URL, tweet: TweetInfo) => [
  `[${escapeForEmbed(tweet.screenName)}(@${escapeForEmbed(tweet.userName)}) ${url.origin}${url.pathname}]`,
  ...tweet.description.split("\n").map((line) => `> ${escapeForEmbed(line)}`),
  ...(tweet.images.length > 0 ? [`> ${tweet.images.map((image) => `[${image}]`)}`] : []),
].join("\n");