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

export const ARRAY_MIN_SIZE = "arrayMinSize";

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

/**
 * Checks if array's length is as minimal this number.
 * If null or undefined is given then this function returns false.
 */
export function ArrayMinSize(min: number, validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: ARRAY_MIN_SIZE,
            constraints: [min],
            validator: {
                validate: (value, args): boolean => arrayMinSize(value, args.constraints[0]),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must contain at least $constraint1 elements",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}