/* ======================================================
 * JFreeChart : a chart library for the Java(tm) platform
 * ======================================================
 *
 * (C) Copyright 2000-present, by David Gilbert and Contributors.
 *
 * Project Info:  https://www.jfree.org/jfreechart/index.html
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ------------
 * DayTest.java
 * ------------
 * (C) Copyright 2001-present, by David Gilbert.
 *
 * Original Author:  David Gilbert;
 * Contributor(s):   -;
 *
 */

package org.jfree.data.time;

import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.ZoneOffset;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;
import java.util.function.Consumer;

import org.jfree.chart.TestUtils;
import org.jfree.chart.date.MonthConstants;

import org.junit.jupiter.api.Test;
import org.jfree.chart.date.SerialDate;

/**
 * Tests for the {@link Day} class.
 */
public class DayTest {

    /**
     * Check that a Day instance is equal to itself.
     *
     * SourceForge Bug ID: 558850.
     */
    @Test
    public void testEqualsSelf() {
        Day day = new Day();
        assertEquals(day, day);
    }

    /**
     * Tests the equals method.
     */
    @Test
    public void testEquals() {
        Day day1 = new Day(29, MonthConstants.MARCH, 2002);
        Day day2 = new Day(29, MonthConstants.MARCH, 2002);
        assertEquals(day1, day2);
    }

    /**
     * In GMT, the end of 29 Feb 2004 is java.util.Date(1,078,099,199,999L).
     * Use this to check the day constructor.
     */
    @Test
    public void testDateConstructor1() {
        TimeZone zone = TimeZone.getTimeZone("GMT");
        Calendar cal = Calendar.getInstance(zone);
        Locale locale = Locale.UK;
        Day d1 = new Day(new Date(1078099199999L), zone, locale);
        Day d2 = new Day(new Date(1078099200000L), zone, locale);

        assertEquals(MonthConstants.FEBRUARY, d1.getMonth());
        assertEquals(1078099199999L, d1.getLastMillisecond(cal));

        assertEquals(MonthConstants.MARCH, d2.getMonth());
        assertEquals(1078099200000L, d2.getFirstMillisecond(cal));
    }

    /**
     * In Helsinki, the end of 29 Feb 2004 is
     * java.util.Date(1,078,091,999,999L).  Use this to check the Day
     * constructor.
     */
    @Test
    public void testDateConstructor2() {
        TimeZone zone = TimeZone.getTimeZone("Europe/Helsinki");
        Calendar cal = Calendar.getInstance(zone);
        Locale locale = Locale.getDefault();  // locale shouldn't matter here
        Day d1 = new Day(new Date(1078091999999L), zone, locale);
        Day d2 = new Day(new Date(1078092000000L), zone, locale);

        assertEquals(MonthConstants.FEBRUARY, d1.getMonth());
        assertEquals(1078091999999L, d1.getLastMillisecond(cal));

        assertEquals(MonthConstants.MARCH, d2.getMonth());
        assertEquals(1078092000000L, d2.getFirstMillisecond(cal));
    }

    /**
     * If a thread-local calendar was set, the Date constructor should use it.
     */
    @Test
    public void testDateConstructorWithThreadLocalCalendar() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setThreadLocalCalendarInstance(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testDateConstructorWithCustomCalendar(3, calendarSetup);
        testDateConstructorWithCustomCalendar(4, calendarSetup);
    }

    /**
     * If a calendar prototype was set, the Date constructor should use it.
     */
    @Test
    public void testDateConstructorWithCalendarPrototype() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setCalendarInstancePrototype(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testDateConstructorWithCustomCalendar(3, calendarSetup);
        testDateConstructorWithCustomCalendar(4, calendarSetup);
    }

    private void testDateConstructorWithCustomCalendar(int hoursOffset, Consumer<Integer> calendarSetup) {
        try {
            calendarSetup.accept(hoursOffset);
            long ms = 86_400_000L - 3_600_000L * hoursOffset;
            Day d = new Day(new Date(ms));
            assertEquals(1970, d.getYear());
            assertEquals(1, d.getMonth());
            assertEquals(2, d.getDayOfMonth());
            assertEquals(ms, d.getFirstMillisecond());
        } finally {
            // reset everything, to avoid affecting other tests
            RegularTimePeriod.setThreadLocalCalendarInstance(null);
            RegularTimePeriod.setCalendarInstancePrototype(null);
        }
    }

    /**
     * If a thread-local calendar was set, the minute-hour constructor should use it.
     */
    @Test
    public void testDMYConstructorWithThreadLocalCalendar() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setThreadLocalCalendarInstance(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testDMYConstructorWithCustomCalendar(3, calendarSetup);
        testDMYConstructorWithCustomCalendar(4, calendarSetup);
    }

    /**
     * If a calendar prototype was set, the DMY constructor should use it.
     */
    @Test
    public void testDMYConstructorWithCalendarPrototype() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setCalendarInstancePrototype(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testDMYConstructorWithCustomCalendar(3, calendarSetup);
        testDMYConstructorWithCustomCalendar(4, calendarSetup);
    }

    private void testDMYConstructorWithCustomCalendar(int hoursOffset, Consumer<Integer> calendarSetup) {
        try {
            calendarSetup.accept(hoursOffset);
            Day d = new Day(1, 1, 1970);
            assertEquals(1970, d.getYear());
            assertEquals(1, d.getMonth());
            assertEquals(1, d.getDayOfMonth());
            assertEquals(-3_600_000L * hoursOffset, d.getFirstMillisecond());
        } finally {
            // reset everything, to avoid affecting other tests
            RegularTimePeriod.setThreadLocalCalendarInstance(null);
            RegularTimePeriod.setCalendarInstancePrototype(null);
        }
    }

    /**
     * If a thread-local calendar was set, the SerialDate constructor should use it.
     */
    @Test
    public void testSerialDateConstructorWithThreadLocalCalendar() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setThreadLocalCalendarInstance(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testSerialDateConstructorWithCustomCalendar(3, calendarSetup);
        testSerialDateConstructorWithCustomCalendar(4, calendarSetup);
    }

    /**
     * If a calendar prototype was set, the SerialDate constructor should use it.
     */
    @Test
    public void testSerialDateConstructorWithCalendarPrototype() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setCalendarInstancePrototype(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testSerialDateConstructorWithCustomCalendar(3, calendarSetup);
        testSerialDateConstructorWithCustomCalendar(4, calendarSetup);
    }

    private void testSerialDateConstructorWithCustomCalendar(int hoursOffset, Consumer<Integer> calendarSetup) {
        try {
            calendarSetup.accept(hoursOffset);
            Day d = new Day(SerialDate.createInstance(1, 1, 1970));
            assertEquals(1970, d.getYear());
            assertEquals(1, d.getMonth());
            assertEquals(1, d.getDayOfMonth());
            assertEquals(-3_600_000L * hoursOffset, d.getFirstMillisecond());
        } finally {
            // reset everything, to avoid affecting other tests
            RegularTimePeriod.setThreadLocalCalendarInstance(null);
            RegularTimePeriod.setCalendarInstancePrototype(null);
        }
    }

    /**
     * Set up a day equal to 1 January 1900.  Request the previous day, it
     * should be null.
     */
    @Test
    public void test1Jan1900Previous() {
        Day jan1st1900 = new Day(1, MonthConstants.JANUARY, 1900);
        Day previous = (Day) jan1st1900.previous();
        assertNull(previous);
    }

    /**
     * Set up a day equal to 1 January 1900.  Request the next day, it should
     * be 2 January 1900.
     */
    @Test
    public void test1Jan1900Next() {
        Day jan1st1900 = new Day(1, MonthConstants.JANUARY, 1900);
        Day next = (Day) jan1st1900.next();
        assertEquals(2, next.getDayOfMonth());
    }

    /**
     * Set up a day equal to 31 December 9999.  Request the previous day, it
     * should be 30 December 9999.
     */
    @Test
    public void test31Dec9999Previous() {
        Day dec31st9999 = new Day(31, MonthConstants.DECEMBER, 9999);
        Day previous = (Day) dec31st9999.previous();
        assertEquals(30, previous.getDayOfMonth());
    }

    /**
     * Set up a day equal to 31 December 9999.  Request the next day, it should
     * be null.
     */
    @Test
    public void test31Dec9999Next() {
        Day dec31st9999 = new Day(31, MonthConstants.DECEMBER, 9999);
        Day next = (Day) dec31st9999.next();
        assertNull(next);
    }

    /**
     * Problem for date parsing.
     * <p>
     * This test works only correct if the short pattern of the date
     * format is "dd/MM/yyyy". If not, this test will result in a
     * false negative.
     *
     * @throws ParseException on parsing errors.
     */
    @Test
    public void testParseDay() throws ParseException {
        GregorianCalendar gc = new GregorianCalendar(2001, 12, 31);
        SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy");
        Date reference = format.parse("31/12/2001");
        if (reference.equals(gc.getTime())) {
            // test 1...
            Day d = Day.parseDay("31/12/2001");
            assertEquals(37256, d.getSerialDate().toSerial());
        }

        // test 2...
        Day d = Day.parseDay("2001-12-31");
        assertEquals(37256, d.getSerialDate().toSerial());
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    @Test
    public void testSerialization() {
        Day d1 = new Day(15, 4, 2000);
        Day d2 = TestUtils.serialised(d1);
        assertEquals(d1, d2);
    }

    /**
     * Two objects that are equal are required to return the same hashCode.
     */
    @Test
    public void testHashcode() {
        Day d1 = new Day(1, 2, 2003);
        Day d2 = new Day(1, 2, 2003);
        assertEquals(d1, d2);
        int h1 = d1.hashCode();
        int h2 = d2.hashCode();
        assertEquals(h1, h2);
    }

    /**
     * The {@link Day} class is immutable, so should not be {@link Cloneable}.
     */
    @Test
    public void testNotCloneable() {
        Day d = new Day(1, 2, 2003);
        assertFalse(d instanceof Cloneable);
    }

    /**
     * Some checks for the getSerialIndex() method.
     */
    @Test
    public void testGetSerialIndex() {
        Day d = new Day(1, 1, 1900);
        assertEquals(2, d.getSerialIndex());
        d = new Day(15, 4, 2000);
        assertEquals(36631, d.getSerialIndex());
    }

    /**
     * Some checks for the getFirstMillisecond() method.
     */
    @Test
    public void testGetFirstMillisecond() {
        Locale saved = Locale.getDefault();
        Locale.setDefault(Locale.UK);
        TimeZone savedZone = TimeZone.getDefault();
        TimeZone.setDefault(TimeZone.getTimeZone("Europe/London"));
        Day d = new Day(1, 3, 1970);
        assertEquals(5094000000L, d.getFirstMillisecond());
        Locale.setDefault(saved);
        TimeZone.setDefault(savedZone);
    }

    /**
     * Some checks for the getFirstMillisecond(TimeZone) method.
     */
    @Test
    public void testGetFirstMillisecondWithTimeZone() {
        Day d = new Day(26, 4, 1950);
        TimeZone zone = TimeZone.getTimeZone("America/Los_Angeles");
        Calendar cal = Calendar.getInstance(zone);
        assertEquals(-621187200000L, d.getFirstMillisecond(cal));

        // try null calendar
        boolean pass = false;
        try {
            d.getFirstMillisecond((Calendar) null);
        }
        catch (NullPointerException e) {
            pass = true;
        }
        assertTrue(pass);
    }

    /**
     * Some checks for the getFirstMillisecond(TimeZone) method.
     */
    @Test
    public void testGetFirstMillisecondWithCalendar() {
        Day d = new Day(1, 12, 2001);
        GregorianCalendar calendar = new GregorianCalendar(Locale.GERMANY);
        calendar.setTimeZone(TimeZone.getTimeZone("Europe/Frankfurt"));
        assertEquals(1007164800000L, d.getFirstMillisecond(calendar));

        // try null calendar
        boolean pass = false;
        try {
            d.getFirstMillisecond((Calendar) null);
        }
        catch (NullPointerException e) {
            pass = true;
        }
        assertTrue(pass);
    }

    /**
     * Some checks for the getLastMillisecond() method.
     */
    @Test
    public void testGetLastMillisecond() {
        Locale saved = Locale.getDefault();
        Locale.setDefault(Locale.UK);
        TimeZone savedZone = TimeZone.getDefault();
        TimeZone.setDefault(TimeZone.getTimeZone("Europe/London"));
        Day d = new Day(1, 1, 1970);
        assertEquals(82799999L, d.getLastMillisecond());
        Locale.setDefault(saved);
        TimeZone.setDefault(savedZone);
    }

    /**
     * Some checks for the getLastMillisecond(TimeZone) method.
     */
    @Test
    public void testGetLastMillisecondWithTimeZone() {
        Day d = new Day(1, 2, 1950);
        TimeZone zone = TimeZone.getTimeZone("America/Los_Angeles");
        Calendar cal = Calendar.getInstance(zone);
        assertEquals(-628358400001L, d.getLastMillisecond(cal));

        // try null calendar
        boolean pass = false;
        try {
            d.getLastMillisecond((Calendar) null);
        }
        catch (NullPointerException e) {
            pass = true;
        }
        assertTrue(pass);
    }

    /**
     * Some checks for the getLastMillisecond(TimeZone) method.
     */
    @Test
    public void testGetLastMillisecondWithCalendar() {

        Day d = new Day(4, 5, 2001);
        Calendar calendar = Calendar.getInstance(
                TimeZone.getTimeZone("Europe/London"), Locale.UK);
        assertEquals(989017199999L, d.getLastMillisecond(calendar));

        // try null calendar
        boolean pass = false;
        try {
            d.getLastMillisecond((Calendar) null);
        }
        catch (NullPointerException e) {
            pass = true;
        }
        assertTrue(pass);
    }

    @Test
    public void testNextPrevious() {
        Day d = new Day(25, 12, 2000);
        d = (Day) d.next();
        assertEquals(2000, d.getYear());
        assertEquals(12, d.getMonth());
        assertEquals(26, d.getDayOfMonth());
        d = (Day) d.previous();
        assertEquals(2000, d.getYear());
        assertEquals(12, d.getMonth());
        assertEquals(25, d.getDayOfMonth());
        d = new Day(31, 12, 9999);
        assertNull(d.next());
    }

    /**
     * If a thread-local calendar was set, next() and previous() should use its time zone.
     */
    @Test
    public void testNextPreviousWithThreadLocalCalendar() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setThreadLocalCalendarInstance(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testNextPreviousWithCustomCalendar(3, calendarSetup);
        testNextPreviousWithCustomCalendar(4, calendarSetup);
    }

    /**
     * If a calendar prototype was set, next() should use its time zone.
     */
    @Test
    public void testNextPreviousWithCalendarPrototype() {
        Consumer<Integer> calendarSetup = hours -> RegularTimePeriod.setCalendarInstancePrototype(
                Calendar.getInstance(TimeZone.getTimeZone(ZoneOffset.ofHours(hours)))
        );
        testNextPreviousWithCustomCalendar(3, calendarSetup);
        testNextPreviousWithCustomCalendar(4, calendarSetup);
    }

    private void testNextPreviousWithCustomCalendar(int hoursOffset, Consumer<Integer> calendarSetup) {
        try {
            calendarSetup.accept(hoursOffset);
            long ms = 86_400_000L - hoursOffset * 3_600_000L;
            Day d = new Day(new Date(ms));
            d = (Day) d.next();
            assertEquals(1970, d.getYear());
            assertEquals(1, d.getMonth());
            assertEquals(3, d.getDayOfMonth());
            assertEquals(ms + 86_400_000L, d.getFirstMillisecond());
            d = (Day) d.previous();
            assertEquals(1970, d.getYear());
            assertEquals(1, d.getMonth());
            assertEquals(2, d.getDayOfMonth());
            assertEquals(ms, d.getFirstMillisecond());
        } finally {
            // reset everything, to avoid affecting other tests
            RegularTimePeriod.setThreadLocalCalendarInstance(null);
            RegularTimePeriod.setCalendarInstancePrototype(null);
        }
    }

    /**
     * Some checks for the getStart() method.
     */
    @Test
    public void testGetStart() {
        Locale saved = Locale.getDefault();
        Locale.setDefault(Locale.ITALY);
        Calendar cal = Calendar.getInstance(Locale.ITALY);
        cal.set(2006, Calendar.NOVEMBER, 3, 0, 0, 0);
        cal.set(Calendar.MILLISECOND, 0);
        Day d = new Day(3, 11, 2006);
        assertEquals(cal.getTime(), d.getStart());
        Locale.setDefault(saved);
    }

    /**
     * Some checks for the getEnd() method.
     */
    @Test
    public void testGetEnd() {
        Locale saved = Locale.getDefault();
        Locale.setDefault(Locale.ITALY);
        Calendar cal = Calendar.getInstance(Locale.ITALY);
        cal.set(1900, Calendar.JANUARY, 1, 23, 59, 59);
        cal.set(Calendar.MILLISECOND, 999);
        Day d = new Day(1, 1, 1900);
        assertEquals(cal.getTime(), d.getEnd());
        Locale.setDefault(saved);
    }

}