const REDDITBOT_SESSION_FILENAME = 'redditbot-session.json';

function isRedditDomain(domain) {
  const normalised = domain.toLowerCase().replace(/^\./, '');
  return normalised === 'reddit.com' || normalised.endsWith('.reddit.com');
}

function toExportCookie(cookie) {
  return {
    name: cookie.name,
    value: cookie.value,
    domain: cookie.domain,
    path: cookie.path,
    expires: cookie.expirationDate,
    httpOnly: cookie.httpOnly,
    secure: cookie.secure,
    sameSite: cookie.sameSite,
  };
}

export function createSessionExportDownload(cookies, matrix) {
  if (!matrix?.homeserver || !matrix?.accessToken || !matrix?.userId) {
    throw new Error('Open Reddit Chat before exporting so Matrix credentials can be captured.');
  }
  const exportFile = {
    cookies: cookies.filter((cookie) => isRedditDomain(cookie.domain)).map(toExportCookie),
    matrix,
  };

  return {
    filename: REDDITBOT_SESSION_FILENAME,
    url: `data:application/json;charset=utf-8,${encodeURIComponent(JSON.stringify(exportFile))}`,
  };
}