import {
    mmyyFutureDateValidation,
} from './mmyy-future-date.validation';

const now = new Date();
const toDateFormat = (date: Date) => {
    const month = (date.getUTCMonth() + 1).toString();
    const year = date.getUTCFullYear().toString().substring(2, 4);
    const monthString = month.length === 1
        ? `0${month}`
        : month;
    return `${monthString}/${year}`;
};

describe('mmyyFutureDateValidation', () => {
    const runMmyyFutureDateValidTest = ({
        dateValue,
        expectedToBeValid,
    }: {
        dateValue: string,
        expectedToBeValid: boolean,
    }) => {
        test(`Expect ${dateValue} to be ${
            expectedToBeValid ? 'valid' : 'invalid'
        }`, () => {
            const result = mmyyFutureDateValidation(dateValue);
            if (expectedToBeValid) {
                expect(result).toBeNull();
            } else {
                expect(result.mmyyFutureDateValidation).toBe(true);
            }
        });
    };

    const invalidDateValues = [
        toDateFormat(now),
        toDateFormat(new Date(now.getFullYear() - 1, now.getUTCMonth() - 1, 1)),
        '05/10',
    ];
    invalidDateValues
        .forEach((dateValue) => runMmyyFutureDateValidTest({
            dateValue,
            expectedToBeValid: false,
        }));

    const validDateValues = [
        toDateFormat(new Date(now.getUTCFullYear(), now.getUTCMonth() + 2, 1)),
        toDateFormat(new Date(now.getUTCFullYear() + 1, now.getUTCMonth(), 1)),
        null,
    ];
    validDateValues
        .forEach((dateValue) => runMmyyFutureDateValidTest({
            dateValue,
            expectedToBeValid: true,
        }));
});