const getAuthor = () => {
  const metaAuthor = document.querySelector<HTMLMetaElement>(`meta[name="author"]`);
  const metaOgAuthor = document.querySelector<HTMLMetaElement>(`meta[property="og:article:author"]`);

  if (metaAuthor) {
    return metaAuthor.getAttribute("content");
  }

  if (metaOgAuthor) {
    return metaOgAuthor.getAttribute("content");
  }

  return "";
}

const getImage = () => {
  const metaOgImage = document.querySelector<HTMLMetaElement>(`meta[property="og:image"]`);

  if (metaOgImage) {
    return metaOgImage.getAttribute("content");
  }

  return "";
}

const getDesc = () => {
  const articleFirstParagraph = document.querySelector<HTMLParagraphElement>("article p") || document.querySelector<HTMLParagraphElement>("p");
  const metaDescription = document.querySelector<HTMLMetaElement>(`meta[name="description"]`);
  const metaOgDescription = document.querySelector<HTMLMetaElement>(`meta[property="og:description"]`);

  if (metaOgDescription) {
    return metaOgDescription.getAttribute("content");
  }

  if (metaDescription) {
    return metaDescription.getAttribute("content");
  }

  if (articleFirstParagraph) {
    return articleFirstParagraph.innerText;
  }

  return "";
}

const getSiteName = () => {
  const title = document.title;
  const metaSiteName = document.querySelector<HTMLMetaElement>(`meta[property="og:site_name"]`);

  if (metaSiteName) {
    return metaSiteName.getAttribute("content");
  }

  if (title.includes(" - ")) {
    const start = title.lastIndexOf(" - ") + 3;

    return title.substring(start);
  }

  if (title.includes(" | ")) {
    const start = title.lastIndexOf(" | ") + 3;

    return title.substring(start);
  }

  return "";
}

const getFrom = () => {
  if (location.host === "mp.weixin.qq.com") {
    return "wechat";
  }

  return "web";
}

chrome.runtime.onMessage.addListener((req, sender, send) => {
  console.log(req);

  if (req.type === "toolbox:getInfo") {
    send({
      title: document.title,
      link: `${location.origin}${location.pathname}`,
      desc: getDesc(),
      from: getFrom(),
      author: getAuthor(),
      image: getImage(),
      sitename: getSiteName(),
    });
  }
});