import type { IBookStackListResponse } from './bookstack.interfaces.js';

/**
 * Auto-paginate a BookStack list endpoint using offset/count.
 * If opts includes a specific offset, returns just that single page (no auto-pagination).
 */
export async function autoPaginate<T>(
  fetchPage: (offset: number, count: number) => Promise<IBookStackListResponse<T>>,
  opts?: { offset?: number; count?: number },
): Promise<T[]> {
  const count = opts?.count || 100;

  // If caller requests a specific offset, return just that page
  if (opts?.offset !== undefined) {
    const result = await fetchPage(opts.offset, count);
    return result.data;
  }

  // Otherwise auto-paginate through all pages
  const all: T[] = [];
  let offset = 0;
  while (true) {
    if (offset > 0) {
      await new Promise((r) => setTimeout(r, 100));
    }
    const result = await fetchPage(offset, count);
    all.push(...result.data);
    offset += count;
    if (offset >= result.total) break;
  }
  return all;
}