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

export const IS_LATITUDE = "isLatitude";

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

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