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

export const ARRAY_MAX_SIZE = "arrayMaxSize";

/**
 * Checks if array's length is as maximal this number.
 * If null or undefined is given then this function returns false.
 */
export function arrayMaxSize(array: unknown, max: number): boolean {
    return array instanceof Array && array.length <= max;
}

/**
 * Checks if array's length is as maximal this number.
 * If null or undefined is given then this function returns false.
 */
export function ArrayMaxSize(max: number, validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: ARRAY_MAX_SIZE,
            constraints: [max],
            validator: {
                validate: (value, args): boolean => arrayMaxSize(value, args.constraints[0]),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must contain not more than $constraint1 elements",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}