import { ValidationOptions } from '../ValidationOptions';
import { buildMessage, ValidateBy } from '../common/ValidateBy';
import isUppercaseValidator from 'validator/lib/isUppercase';

export const IS_UPPERCASE = 'isUppercase';

/**
 * Checks if the string is uppercase.
 * If given value is not a string, then it returns false.
 */
export function isUppercase(value: unknown): boolean {
  return typeof value === 'string' && isUppercaseValidator(value);
}

/**
 * Checks if the string is uppercase.
 * If given value is not a string, then it returns false.
 */
export function IsUppercase(validationOptions?: ValidationOptions): PropertyDecorator {
  return ValidateBy(
    {
      name: IS_UPPERCASE,
      validator: {
        validate: (value, args): boolean => isUppercase(value),
        defaultMessage: buildMessage(eachPrefix => eachPrefix + '$property must be uppercase', validationOptions),
      },
    },
    validationOptions
  );
}