import './index.js';

describe('Travel Component vnTravel', () => {
    let controller;

    beforeEach(ngModule('travel'));

    beforeEach(angular.mock.inject($componentController => {
        let $element = angular.element(`<div></div>`);
        controller = $componentController('vnTravel', {$element});
    }));

    describe('fetchParams()', () => {
        it('should return a range of dates with passed scope days', () => {
            /**
             * Calculates the difference in days between two dates, it also
             * accounts for cases where the two dates in question span a
             * daylight saving time (DST) change.
             *
             * @param {Date} a The start date
             * @param {Date} b The end date
             * @return {Number} The difference in days
             */
            function diffInDays(a, b) {
                const utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
                const utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());
                const msInDay = 86400 * 1000;
                return Math.floor((utc2 - utc1) / msInDay);
            }

            let params = controller.fetchParams({scopeDays: 2});
            const diff = diffInDays(
                params.shippedFrom,
                new Date(params.shippedTo.getTime() + 1)
            );

            expect(diff).toEqual(3);
        });
    });
});