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

export const IS_MILITARY_TIME = "isMilitaryTime";

/**
 * Checks if the string represents a time without a given timezone in the format HH:MM (military)
 * If the given value does not match the pattern HH:MM, then it returns false.
 */
export function isMilitaryTime(value: unknown): boolean {
    const militaryTimeRegex = /^([01]\d|2[0-3]):?([0-5]\d)$/;
    return typeof value === "string" && validator.matches(value, militaryTimeRegex);
}

/**
 * Checks if the string represents a time without a given timezone in the format HH:MM (military)
 * If the given value does not match the pattern HH:MM, then it returns false.
 */
export function IsMilitaryTime(validationOptions?: ValidationOptions): PropertyDecorator {
    return ValidateBy(
        {
            name: IS_MILITARY_TIME,
            validator: {
                validate: (value, args): boolean => isMilitaryTime(value),
                defaultMessage: buildMessage(
                    (eachPrefix) => eachPrefix + "$property must be a valid representation of military time in the format HH:MM",
                    validationOptions
                )
            }
        },
        validationOptions
    );
}