import { isValid, parse } from 'date-fns';
import pattern from './pattern';
import provinces from './provinces';
import { ValidateHandle } from '../types';

const checkCode = (idCardNum: string): boolean => {
  const factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
  const parity = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];
  const code = idCardNum.substring(17);

  const sum = idCardNum
    .split('')
    .filter((currentValue, index) => index < 17)
    // eslint-disable-next-line max-len
    .reduce((accumulator, currentValue, index) => accumulator + parseInt(currentValue, 10) * factor[index], 0);

  return parity[sum % 11] === code.toUpperCase();
};

const checkDate = (idCardNum: string): boolean => {
  const birthDate = idCardNum.substring(6, 14);
  return isValid(parse(birthDate, 'yyyyMMdd', new Date()));
};

const checkProvince = (idCardNum: string): boolean => {
  const provinceCode = idCardNum.substring(0, 2);
  return !!provinces[provinceCode];
};

/**
 * 验证身份证号
 * @param {string} idCardNum - 身份证号
 * @return {boolean}
 */
const validate: ValidateHandle = (idCardNum) => {
  const validateCode = checkCode(idCardNum);
  const validateDate = checkDate(idCardNum);
  const validateProvince = checkProvince(idCardNum);

  return pattern.test(idCardNum) && validateCode && validateDate && validateProvince;
};

export default validate;