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

export type IsISBNVersion = "10" | "13" | 10 | 13;

export const IS_ISBN = "isIsbn";

/**
 * Checks if the string is an ISBN (version 10 or 13).
 * If given value is not a string, then it returns false.
 */
export function isISBN(value: unknown, version?: IsISBNVersion): boolean {
    const versionStr = version ? (`${version}` as "10" | "13") : undefined;
    return typeof value === "string" && ValidatorJS.isISBN(value, versionStr);
}

/**
 * Checks if the string is an ISBN (version 10 or 13).
 * If given value is not a string, then it returns false.
 */
export function IsISBN(version?: IsISBNVersion, validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: IS_ISBN,
            constraints: [version],
            validator: {
                validate: (value, args): boolean => isISBN(value, args.constraints[0]),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must be an ISBN",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}