import { ValidationOptions } from '../ValidationOptions';
import { buildMessage, ValidateBy } from '../common/ValidateBy';

export const MAX = 'max';

/**
 * Checks if the first number is less than or equal to the second.
 */
export function max(num: unknown, max: number): boolean {
  return typeof num === 'number' && typeof max === 'number' && num <= max;
}

/**
 * Checks if the first number is less than or equal to the second.
 */
export function Max(maxValue: number, validationOptions?: ValidationOptions): PropertyDecorator {
  return ValidateBy(
    {
      name: MAX,
      constraints: [maxValue],
      validator: {
        validate: (value, args): boolean => max(value, args.constraints[0]),
        defaultMessage: buildMessage(
          eachPrefix => eachPrefix + '$property must not be greater than $constraint1',
          validationOptions
        ),
      },
    },
    validationOptions
  );
}