@accounter/server/src/shared/helpers/validators.ts

/**
 * validates input contains only digits
 * @param {string} value
 * @returns {boolean}
 */
export const onlyDigitsValidator = (value: string): boolean => {
  return !!value && /^\d+$/.test(value);
};

/**
 * validates value is of exact length and contains only digit
 * @param {string} value
 * @param {number} length
 * @returns
 */
export const idValidator = (value: string, length: number): boolean => {
  if (value.length !== length) {
    return false;
  }
  return onlyDigitsValidator(value);
};

/**
 * validates string format is YYYYMM
 * @param {string} value YYYYMM
 * @returns {boolean}
 */
export const yearMonthValidator = (value: string): boolean => {
  try {
    if (value.length !== 6) {
      return false;
    }
    if (!onlyDigitsValidator(value)) {
      return false;
    }

    const yearS = value.substring(0, 4);
    const year = parseInt(yearS);
    if (year > 2050 || year < 1990) {
      return false;
    }

    const monthS = value.substring(4, 6);
    const month = parseInt(monthS);
    if (month > 12 || month < 1) {
      return false;
    }

    return true;
  } catch {
    return false;
  }
};