import { ValidationOptions } from '../ValidationOptions';
import { buildMessage, ValidateBy } from '../common/ValidateBy';
import isIso8601Validator from 'validator/lib/isISO8601';
import ValidatorJS from 'validator';

export const IS_ISO8601 = 'isIso8601';

/**
 * Checks if the string is a valid ISO 8601 date.
 * If given value is not a string, then it returns false.
 * Use the option strict = true for additional checks for a valid date, e.g. invalidates dates like 2019-02-29.
 */
export function isISO8601(value: unknown, options?: ValidatorJS.IsISO8601Options): boolean {
  return typeof value === 'string' && isIso8601Validator(value, options);
}

/**
 * Checks if the string is a valid ISO 8601 date.
 * If given value is not a string, then it returns false.
 * Use the option strict = true for additional checks for a valid date, e.g. invalidates dates like 2019-02-29.
 */
export function IsISO8601(
  options?: ValidatorJS.IsISO8601Options,
  validationOptions?: ValidationOptions
): PropertyDecorator {
  return ValidateBy(
    {
      name: IS_ISO8601,
      constraints: [options],
      validator: {
        validate: (value, args): boolean => isISO8601(value, args.constraints[0]),
        defaultMessage: buildMessage(
          eachPrefix => eachPrefix + '$property must be a valid ISO 8601 date string',
          validationOptions
        ),
      },
    },
    validationOptions
  );
}