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
    );
}