import { extractLinkIdFromUrl, extractUserIdFromUrl } from './extractors.js';

interface FeedTargetInput {
  link_id?: string;
  url?: string;
}

interface UserTargetInput {
  user_id?: string;
  url?: string;
}

export interface FeedTargetResolved {
  linkId: string;
}

export interface UserTargetResolved {
  userId: string;
}

function normalizeUrl(url: string): string {
  const trimmed = url.trim();
  if (!trimmed) {
    throw new Error('url cannot be empty');
  }
  return trimmed;
}

export function resolveFeedTarget(input: FeedTargetInput): FeedTargetResolved {
  const direct = input.link_id?.trim();
  if (direct) return { linkId: direct };

  if (input.url) {
    const parsed = extractLinkIdFromUrl(normalizeUrl(input.url));
    if (parsed) return { linkId: parsed };
  }

  throw new Error('xhh_get_feed_detail requires link_id or url containing link_id');
}

export function resolveUserTarget(input: UserTargetInput): UserTargetResolved {
  const direct = input.user_id?.trim();
  if (direct) return { userId: direct };

  if (input.url) {
    const parsed = extractUserIdFromUrl(normalizeUrl(input.url));
    if (parsed) return { userId: parsed };
  }

  throw new Error('xhh_get_user_profile requires user_id or url containing user_id');
}