/**
 * Freebit Provider Utilities
 *
 * Provider-specific utilities for Freebit SIM API integration
 */

/**
 * Normalize account identifier (remove formatting)
 * Removes all non-digit characters from account string
 */
export function normalizeAccount(account: string): string {
  return account.replace(/[^0-9]/g, "");
}

/**
 * Validate account format (10-11 digits for Japanese phone numbers)
 */
export function validateAccount(account: string): boolean {
  const normalized = normalizeAccount(account);
  return /^\d{10,11}$/.test(normalized);
}

/**
 * Format date for Freebit API (YYYYMMDD)
 */
export function formatDateForApi(date: Date): string {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, "0");
  const day = String(date.getDate()).padStart(2, "0");
  return `${year}${month}${day}`;
}

/**
 * Parse date from Freebit API format (YYYYMMDD)
 * @returns Date object or null if invalid format
 */
export function parseDateFromApi(dateString: string): Date | null {
  if (!/^\d{8}$/.test(dateString)) return null;

  const year = parseInt(dateString.substring(0, 4), 10);
  const month = parseInt(dateString.substring(4, 6), 10) - 1; // Month is 0-indexed
  const day = parseInt(dateString.substring(6, 8), 10);

  return new Date(year, month, day);
}