import { PHONE_REGEX } from "./constants";

// Phone validation function
export const validatePhone = (phone: string, countryCode: string): string => {
  if (!phone) return ""; // Phone is optional

  // Remove any non-digit characters except +
  const cleanPhone = phone.replace(/[^\d+]/g, "");

  // Check if phone starts with country code
  if (cleanPhone.startsWith(countryCode)) {
    const phoneNumber = cleanPhone.substring(countryCode.length);
    if (phoneNumber.length < 7 || phoneNumber.length > 15) {
      return "Phone number must be between 7-15 digits";
    }
    if (!PHONE_REGEX.test(phoneNumber)) {
      return "Invalid phone number format";
    }
  } else {
    // If phone doesn't start with country code, validate the whole number
    if (cleanPhone.length < 7 || cleanPhone.length > 15) {
      return "Phone number must be between 7-15 digits";
    }
    if (!PHONE_REGEX.test(cleanPhone)) {
      return "Invalid phone number format";
    }
  }

  return "";
};

// Format phone number display
export const formatPhoneDisplay = (
  phone: string,
  countryCode: string
): string => {
  if (!phone) return "";

  // Remove any non-digit characters except +
  const cleanPhone = phone.replace(/[^\d+]/g, "");

  // If phone already includes country code, return as is
  if (cleanPhone.startsWith(countryCode)) {
    return cleanPhone;
  }

  // Otherwise, prepend country code
  return `${countryCode}${cleanPhone}`;
};