export interface ParsedAuthorIds {
  duplicates: string[];
  invalidTokens: string[];
  ids: string[];
}

const AUTHOR_ID_PATTERN = /^\d{16,20}$/;

export function parseAuthorIds(input: string): ParsedAuthorIds {
  const ids: string[] = [];
  const duplicates: string[] = [];
  const invalidTokens: string[] = [];
  const seen = new Set<string>();

  input
    .split(/[\s,，;；]+/)
    .map((token) => token.trim())
    .filter(Boolean)
    .forEach((token) => {
      if (!/^\d+$/.test(token) || !AUTHOR_ID_PATTERN.test(token)) {
        invalidTokens.push(token);
        return;
      }

      if (seen.has(token)) {
        duplicates.push(token);
        return;
      }

      seen.add(token);
      ids.push(token);
    });

  return {
    duplicates,
    ids,
    invalidTokens
  };
}