/**
 * parse bluesky URLs into AT-URI components
 *
 * supports:
 *   https://bsky.app/profile/{handle}/post/{rkey}
 *   at://{did}/{collection}/{rkey}
 */

const BSKY_URL_RE =
  /^https?:\/\/bsky\.app\/profile\/([^/]+)\/post\/([a-z2-7]+)$/;

const AT_URI_RE = /^at:\/\/(did:[^/]+)\/(app\.bsky\.feed\.post)\/([a-z2-7]+)$/;

export function parseBlueskyUrl(input) {
  const trimmed = input.trim();

  // try AT-URI first
  const atMatch = trimmed.match(AT_URI_RE);
  if (atMatch) {
    return { did: atMatch[1], collection: atMatch[2], rkey: atMatch[3] };
  }

  // try bsky.app URL
  const urlMatch = trimmed.match(BSKY_URL_RE);
  if (urlMatch) {
    return { handle: urlMatch[1], rkey: urlMatch[2] };
  }

  return null;
}

export function makeAtUri(did, collection, rkey) {
  return `at://${did}/${collection}/${rkey}`;
}