import {
    ValidationErrors,
} from 'ngrx-forms';

import {
    MMYY_DATE_FORMAT_REGEX,
} from './../../../models/index';

/**
 * Best used with mmyy-date-format-validation to ensure the date is in the
 * correct format.
 */
export const mmyyFutureDateValidation = (
    value: string | null,
): ValidationErrors => {
    if (!value) {
        return null;
    }
    const [ month, year ] = value.split('/');
    const monthNumber = parseInt(month, 10);
    const currentDate = new Date();
    const date = new Date(2000 + parseInt(year, 10), monthNumber - 1);
    if (monthNumber > 12 || date <= currentDate) {
        return {
            mmyyFutureDateValidation: true,
        };
    }

    return null;
};