import states from './states';

function handleContentLinks(opts) {
  const { mentions = [], instance, previewMode, statusURL } = opts || {};
  return (e) => {
    let { target } = e;
    target = target.closest('a');
    if (!target) return;

    // If cmd/ctrl/shift/alt key is pressed or middle-click, let the browser handle it
    if (e.metaKey || e.ctrlKey || e.shiftKey || e.altKey || e.which === 2) {
      return;
    }

    const prevText = target.previousSibling?.textContent;
    const textBeforeLinkIsAt = prevText?.endsWith('@');
    const textStartsWithAt = target.innerText.startsWith('@');
    if (
      ((target.classList.contains('u-url') ||
        target.classList.contains('mention')) &&
        textStartsWithAt) ||
      (textBeforeLinkIsAt && !textStartsWithAt)
    ) {
      const targetText = (
        target.querySelector('span') || target
      ).innerText.trim();
      const username = targetText.replace(/^@/, '');
      const url = target.getAttribute('href');
      // Only fallback to acct/username check if url doesn't match
      const mention =
        mentions.find((mention) => mention.url === url) ||
        mentions.find(
          (mention) =>
            mention.acct === username || mention.username === username,
        );
      console.warn('MENTION', mention, url);
      if (mention) {
        e.preventDefault();
        e.stopPropagation();
        states.showAccount = {
          account: mention.acct,
          instance,
        };
      } else if (!/^http/i.test(targetText)) {
        console.log('mention not found', targetText);
        e.preventDefault();
        e.stopPropagation();
        const href = target.getAttribute('href');
        states.showAccount = {
          account: href,
          instance,
        };
      }
    } else if (!previewMode) {
      const textBeforeLinkIsHash = prevText?.endsWith('#');
      if (target.classList.contains('hashtag') || textBeforeLinkIsHash) {
        e.preventDefault();
        e.stopPropagation();
        const tag = target.innerText.replace(/^#/, '').trim();
        const hashURL = instance ? `#/${instance}/t/${tag}` : `#/t/${tag}`;
        console.log({ hashURL });
        location.hash = hashURL;
      } else if (
        states.unfurledLinks[target.href]?.url &&
        statusURL !== target.href
      ) {
        // If unfurled AND not self-referential
        e.preventDefault();
        e.stopPropagation();
        states.prevLocation = {
          pathname: location.hash.replace(/^#/, ''),
        };
        location.hash = `#${states.unfurledLinks[target.href].url}`;
      }
    }
  };
}

export default handleContentLinks;