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

// isDefined is (yet) a special case
export const IS_DEFINED = ValidationTypes.IS_DEFINED;

/**
 * Checks if value is defined (!== undefined, !== null).
 */
export function isDefined(value: any): boolean {
    return value !== undefined && value !== null;
}

/**
 * Checks if value is defined (!== undefined, !== null).
 */
export function IsDefined(validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: IS_DEFINED,
            validator: {
                validate: (value): boolean => isDefined(value),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property should not be null or undefined",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}