import { badRequest } from '../errors.js';

export type NormalizedPhoneNumber = {
  countryCode: string;
  nationalNumber: string;
  e164: string;
  maskedNationalNumber: string;
};

function stripPhoneInput(input: string) {
  return input.replace(/[^\d+]/gu, '').trim();
}

export function maskNationalPhoneNumber(phoneNumber: string) {
  if (phoneNumber.length < 7) {
    return phoneNumber;
  }

  return `${phoneNumber.slice(0, 3)}****${phoneNumber.slice(-4)}`;
}

export function normalizeMainlandChinaPhoneNumber(
  phoneInput: string,
): NormalizedPhoneNumber {
  const trimmed = stripPhoneInput(phoneInput);
  if (!trimmed) {
    throw badRequest('请输入手机号');
  }

  let nationalNumber = trimmed;
  if (nationalNumber.startsWith('+86')) {
    nationalNumber = nationalNumber.slice(3);
  } else if (nationalNumber.startsWith('86') && nationalNumber.length === 13) {
    nationalNumber = nationalNumber.slice(2);
  }

  if (!/^1\d{10}$/u.test(nationalNumber)) {
    throw badRequest('请输入正确的中国大陆手机号');
  }

  return {
    countryCode: '86',
    nationalNumber,
    e164: `+86${nationalNumber}`,
    maskedNationalNumber: maskNationalPhoneNumber(nationalNumber),
  };
}

export function validateSmsVerifyCode(verifyCode: string) {
  const normalizedVerifyCode = verifyCode.trim();
  if (!/^[A-Za-z0-9]{4,8}$/u.test(normalizedVerifyCode)) {
    throw badRequest('请输入正确的验证码');
  }
  return normalizedVerifyCode;
}