/** @format */
/**
 * External dependencies
 */
import moment from 'moment';

/**
 * Internal dependencies
 */
import { toMoment, getLastPeriod, getCurrentPeriod, getRangeLabel } from 'lib/date';

describe( 'toMoment', () => {
	it( 'should pass through a valid Moment object as an argument', () => {
		const now = moment();
		const myMoment = toMoment( 'YYYY', now );
		expect( myMoment ).toEqual( now );
	} );

	it( 'should handle isoFormat dates', () => {
		const myMoment = toMoment( 'YYYY', '2018-04-15' );
		expect( moment.isMoment( myMoment ) ).toBe( true );
		expect( myMoment.isValid() ).toBe( true );
	} );

	it( 'should handle local formats', () => {
		const longDate = toMoment( 'MMMM D, YYYY', 'April 15, 2018' );
		expect( moment.isMoment( longDate ) ).toBe( true );
		expect( longDate.isValid() ).toBe( true );
		expect( longDate.date() ).toBe( 15 );
		expect( longDate.month() ).toBe( 3 );
		expect( longDate.year() ).toBe( 2018 );

		const shortDate = toMoment( 'DD/MM/YYYY', '15/04/2018' );
		expect( moment.isMoment( shortDate ) ).toBe( true );
		expect( shortDate.isValid() ).toBe( true );
		expect( shortDate.date() ).toBe( 15 );
		expect( shortDate.month() ).toBe( 3 );
		expect( shortDate.year() ).toBe( 2018 );
	} );

	it( 'should throw on an invalid argument', () => {
		const fn = () => toMoment( '', 77 );
		expect( fn ).toThrow();
	} );
} );

describe( 'getCurrentPeriod', () => {
	it( 'should return a DateValue object with correct properties', () => {
		const dateValue = getCurrentPeriod( 'day', 'previous_period' );

		expect( dateValue.primaryStart ).toBeDefined();
		expect( dateValue.primaryEnd ).toBeDefined();
		expect( dateValue.secondaryStart ).toBeDefined();
		expect( dateValue.secondaryEnd ).toBeDefined();
	} );

	// day
	const today = moment();
	const yesterday = moment().subtract( 1, 'days' );
	const todayLastYear = moment().subtract( 1, 'years' );

	// week
	const thisWeekStart = moment().startOf( 'week' );
	const lastWeekStart = thisWeekStart.clone().subtract( 1, 'week' );
	const todayLastWeek = today.clone().subtract( 1, 'week' );

	// month
	const thisMonthStart = moment().startOf( 'month' );
	const lastMonthStart = thisMonthStart.clone().subtract( 1, 'month' );
	const todayLastMonth = today.clone().subtract( 1, 'month' );

	// quarter
	const thisQuarterStart = moment().startOf( 'quarter' );
	const lastQuarterStart = thisQuarterStart.clone().subtract( 1, 'quarter' );
	const todayLastQuarter = today.clone().subtract( 1, 'quarter' );

	// year
	const thisYearStart = moment().startOf( 'year' );
	const lastYearStart = thisYearStart.clone().subtract( 1, 'year' );

	describe( 'day', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getCurrentPeriod( 'day', 'previous_period' );

			expect( today.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( today.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getCurrentPeriod( 'day', 'previous_period' );

			expect( yesterday.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( yesterday.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getCurrentPeriod( 'day', 'previous_year' );

			expect( todayLastYear.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayLastYear.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'week', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getCurrentPeriod( 'week', 'previous_period' );

			expect( thisWeekStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( today.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getCurrentPeriod( 'week', 'previous_period' );

			expect( lastWeekStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayLastWeek.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getCurrentPeriod( 'week', 'previous_year' );
			const daysSoFar = today.diff( thisWeekStart, 'days' );
			const thisWeekLastYearStart = thisWeekStart
				.clone()
				.subtract( 1, 'years' )
				.week( thisWeekStart.week() )
				.startOf( 'week' );
			const todayThisWeekLastYear = thisWeekLastYearStart.clone().add( daysSoFar, 'days' );

			expect( thisWeekLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayThisWeekLastYear.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'month', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getCurrentPeriod( 'month', 'previous_period' );

			expect( thisMonthStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( today.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getCurrentPeriod( 'month', 'previous_period' );

			expect( lastMonthStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayLastMonth.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getCurrentPeriod( 'month', 'previous_year' );
			const daysSoFar = today.diff( thisMonthStart, 'days' );

			const thisMonthLastYearStart = thisMonthStart.clone().subtract( 1, 'years' );
			const thisMonthLastYearEnd = thisMonthLastYearStart.clone().add( daysSoFar, 'days' );

			expect( thisMonthLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( thisMonthLastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'quarter', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getCurrentPeriod( 'quarter', 'previous_period' );

			expect( thisQuarterStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( today.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getCurrentPeriod( 'quarter', 'previous_period' );

			expect( lastQuarterStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayLastQuarter.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getCurrentPeriod( 'quarter', 'previous_year' );
			const daysSoFar = today.diff( thisQuarterStart, 'days' );

			const thisQuarterLastYearStart = thisQuarterStart.clone().subtract( 1, 'years' );
			const thisQuarterLastYearEnd = thisQuarterLastYearStart.clone().add( daysSoFar, 'days' );

			expect( thisQuarterLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( thisQuarterLastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'year', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getCurrentPeriod( 'year', 'previous_period' );

			expect( thisYearStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( today.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getCurrentPeriod( 'year', 'previous_period' );

			expect( lastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( todayLastYear.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getCurrentPeriod( 'year', 'previous_year' );
			const daysSoFar = today.diff( thisYearStart, 'days' );

			const lastYearEnd = lastYearStart.clone().add( daysSoFar, 'days' );

			expect( lastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( lastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );
} );

describe( 'getLastPeriod', () => {
	it( 'should return a DateValue object with correct properties', () => {
		const dateValue = getLastPeriod( 'day', 'previous_period' );

		expect( dateValue.primaryStart ).toBeDefined();
		expect( dateValue.primaryEnd ).toBeDefined();
		expect( dateValue.secondaryStart ).toBeDefined();
		expect( dateValue.secondaryEnd ).toBeDefined();
	} );

	// day
	const yesterday = moment().subtract( 1, 'days' );
	const twoDaysAgo = moment().subtract( 2, 'days' );
	const yesterdayLastYear = moment()
		.subtract( 1, 'days' )
		.subtract( 1, 'years' );

	// week
	const lastWeekStart = moment()
		.startOf( 'week' )
		.subtract( 1, 'week' );
	const lastWeekEnd = lastWeekStart.clone().endOf( 'week' );

	// month
	const lastMonthStart = moment()
		.startOf( 'month' )
		.subtract( 1, 'month' );
	const lastMonthEnd = lastMonthStart.clone().endOf( 'month' );

	// quarter
	const lastQuarterStart = moment()
		.startOf( 'quarter' )
		.subtract( 1, 'quarter' );
	const lastQuarterEnd = lastQuarterStart.clone().endOf( 'quarter' );

	// year
	const lastYearStart = moment()
		.startOf( 'year' )
		.subtract( 1, 'year' );
	const lastYearEnd = lastYearStart.clone().endOf( 'year' );
	const twoYearsAgoStart = moment()
		.startOf( 'year' )
		.subtract( 2, 'year' );

	describe( 'day', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getLastPeriod( 'day', 'previous_period' );

			expect( yesterday.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( yesterday.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'day', 'previous_period' );

			expect( twoDaysAgo.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoDaysAgo.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getLastPeriod( 'day', 'previous_year' );

			expect( yesterdayLastYear.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( yesterdayLastYear.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'week', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getLastPeriod( 'week', 'previous_period' );

			expect( lastWeekStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( lastWeekEnd.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'week', 'previous_period' );

			const twoWeeksAgoStart = lastWeekStart.clone().subtract( 1, 'week' );
			const twoWeeksAgoEnd = twoWeeksAgoStart.clone().endOf( 'week' );

			expect( twoWeeksAgoStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoWeeksAgoEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getLastPeriod( 'week', 'previous_year' );

			const lastWeekLastYearStart = lastWeekStart
				.clone()
				.subtract( 1, 'year' )
				.week( lastWeekStart.week() )
				.startOf( 'week' );
			const lastWeekLastYearEnd = lastWeekLastYearStart.clone().endOf( 'week' );

			expect( lastWeekLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( lastWeekLastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'month', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getLastPeriod( 'month', 'previous_period' );

			expect( lastMonthStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( lastMonthEnd.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'month', 'previous_period' );
			const daysDiff = lastMonthEnd.diff( lastMonthStart, 'days' );

			const twoMonthsAgoEnd = lastMonthStart.clone().subtract( 1, 'days' );
			const twoMonthsAgoStart = twoMonthsAgoEnd.clone().subtract( daysDiff, 'days' );

			expect( twoMonthsAgoStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoMonthsAgoEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getLastPeriod( 'month', 'previous_year' );

			const lastMonthkLastYearStart = lastMonthStart.clone().subtract( 1, 'year' );
			const lastMonthkLastYearEnd = lastMonthkLastYearStart.clone().endOf( 'month' );

			expect( lastMonthkLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( lastMonthkLastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'quarter', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getLastPeriod( 'quarter', 'previous_period' );

			expect( lastQuarterStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( lastQuarterEnd.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'quarter', 'previous_period' );
			const daysDiff = lastQuarterEnd.diff( lastQuarterStart, 'days' );

			const twoQuartersAgoEnd = lastQuarterStart.clone().subtract( 1, 'days' );
			const twoQuartersAgoStart = twoQuartersAgoEnd.clone().subtract( daysDiff, 'days' );

			expect( twoQuartersAgoStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoQuartersAgoEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_year', () => {
			const dateValue = getLastPeriod( 'quarter', 'previous_year' );
			const lastQuarterLastYearStart = lastQuarterStart.clone().subtract( 1, 'year' );
			const lastQuarterLastYearEnd = lastQuarterLastYearStart.clone().endOf( 'quarter' );

			expect( lastQuarterLastYearStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( lastQuarterLastYearEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );

	describe( 'year', () => {
		it( 'should return correct values for primary period', () => {
			const dateValue = getLastPeriod( 'year', 'previous_period' );

			expect( lastYearStart.isSame( dateValue.primaryStart, 'day' ) ).toBe( true );
			expect( lastYearEnd.isSame( dateValue.primaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'year', 'previous_period' );
			const twoYearsAgoEnd = twoYearsAgoStart.clone().endOf( 'year' );

			expect( twoYearsAgoStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoYearsAgoEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );

		it( 'should return correct values for previous_period', () => {
			const dateValue = getLastPeriod( 'year', 'previous_year' );
			const twoYearsAgoEnd = twoYearsAgoStart.clone().endOf( 'year' );

			expect( twoYearsAgoStart.isSame( dateValue.secondaryStart, 'day' ) ).toBe( true );
			expect( twoYearsAgoEnd.isSame( dateValue.secondaryEnd, 'day' ) ).toBe( true );
		} );
	} );
} );

describe( 'getRangeLabel', () => {
	it( 'should return correct string for dates on the same day', () => {
		const label = getRangeLabel( moment( '2018-04-15' ), moment( '2018-04-15' ) );
		expect( label ).toBe( 'Apr 15, 2018' );
	} );

	it( 'should return correct string for dates in the same month', () => {
		const label = getRangeLabel( moment( '2018-04-01' ), moment( '2018-04-15' ) );
		expect( label ).toBe( 'Apr 1 - 15, 2018' );
	} );

	it( 'should return correct string for dates in the same year, but different months', () => {
		const label = getRangeLabel( moment( '2018-04-01' ), moment( '2018-05-15' ) );
		expect( label ).toBe( 'Apr 1 - May 15, 2018' );
	} );

	it( 'should return correct string for dates in different years', () => {
		const label = getRangeLabel( moment( '2017-04-01' ), moment( '2018-05-15' ) );
		expect( label ).toBe( 'Apr 1, 2017 - May 15, 2018' );
	} );
} );