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

export const EQUALS = "equals";

/**
 * Checks if value matches ("===") the comparison.
 */
export function equals(value: unknown, comparison: unknown): boolean {
    return value === comparison;
}

/**
 * Checks if value matches ("===") the comparison.
 */
export function Equals(comparison: any, validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: EQUALS,
            constraints: [comparison],
            validator: {
                validate: (value, args): boolean => equals(value, args.constraints[0]),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must be equal to $constraint1",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}