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

export const IS_LONGITUDE = "isLongitude";

/**
 * Checks if a given value is a longitude.
 */
export function isLongitude(value: string): boolean {
    return (typeof value === "number" || typeof value === "string") && isLatLong(`0,${value}`);
}

/**
 * Checks if a given value is a longitude.
 */
export function IsLongitude(validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: IS_LONGITUDE,
            validator: {
                validate: (value, args): boolean => isLongitude(value),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must be a longitude string or number",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}