const invalidSheetCharacters = /[:/\\?*[\]]/g;

export function sanitizeSheetName(input: string, maxLength = 100): string {
  const cleaned = input.replace(invalidSheetCharacters, ' ').replace(/\s+/g, ' ').trim();
  return (cleaned || 'Newsletter').slice(0, maxLength);
}

export function escapeCell(value: unknown): unknown {
  if (typeof value !== 'string') {
    return value;
  }
  return /^[=+\-@]/.test(value) ? `'${value}` : value;
}

export interface CatalogPayload {
  rows: Record<string, unknown>[];
  sponsors: Record<string, unknown>[];
  deadLinks: Record<string, unknown>[];
}

export interface OutputWriter {
  write(payload: CatalogPayload, summary?: Record<string, unknown>): Promise<unknown>;
}