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

export const IS_EMAIL = "isEmail";

/**
 * Checks if the string is an email.
 * If given value is not a string, then it returns false.
 */
export function isEmail(value: unknown, options?: ValidatorJS.IsEmailOptions): boolean {
    return typeof value === "string" && ValidatorJS.isEmail(value, options);
}

/**
 * Checks if the string is an email.
 * If given value is not a string, then it returns false.
 */
export function IsEmail(options?: ValidatorJS.IsEmailOptions, validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: IS_EMAIL,
            constraints: [options],
            validator: {
                validate: (value, args): boolean => isEmail(value, args.constraints[0]),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must be an email",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}