/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://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.]
 *
 * ---------------
 * MonthTests.java
 * ---------------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 16-Nov-2001 : Version 1 (DG);
 * 14-Feb-2002 : Order of parameters in Month(int, int) constructor
 *               changed (DG);
 * 26-Jun-2002 : Removed unnecessary import (DG);
 * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 13-Mar-2003 : Added serialization test (DG);
 * 21-Oct-2003 : Added hashCode test (DG);
 * 11-Jan-2005 : Added non-clonability test (DG);
 * 05-Oct-2006 : Added some new tests (DG);
 * 11-Jul-2007 : Fixed bad time zone assumption (DG);
 *
 */

package org.jfree.data.time;

import org.jfree.chart.date.MonthConstants;
import org.junit.Before;
import org.junit.Test;

import java.io.*;
import java.util.*;

import static org.jfree.chart.date.SerialDate.DATE_FORMAT_SYMBOLS;
import static org.junit.Assert.*;

/**
 * Tests for the {@link Month} class.
 */
public class MonthTest  {

    /** A month. */
    private Month jan1900;

    /** A month. */
    private Month feb1900;

    /** A month. */
    private Month nov9999;

    /** A month. */
    private Month dec9999;





    /**
     * Common test setup.
     */
    @Before
    public void setUp() {
        this.jan1900 = new Month(MonthConstants.JANUARY, 1900);
        this.feb1900 = new Month(MonthConstants.FEBRUARY, 1900);
        this.nov9999 = new Month(MonthConstants.NOVEMBER, 9999);
        this.dec9999 = new Month(MonthConstants.DECEMBER, 9999);
    }

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

    /**
     * Tests the equals method.
     */
    @Test
    public void testEquals() {
        Month m1 = new Month(MonthConstants.MAY, 2002);
        Month m2 = new Month(MonthConstants.MAY, 2002);
        assertEquals(m1, m2);
    }

    /**
     * In GMT, the end of Feb 2000 is java.util.Date(951,868,799,999L).  Use
     * this to check the Month constructor.
     */
    @Test
    public void testDateConstructor1() {

        TimeZone zone = TimeZone.getTimeZone("GMT");
        Calendar c = new GregorianCalendar(zone);
        Locale locale = Locale.UK;
        Month m1 = new Month(new Date(951868799999L), zone, locale);
        Month m2 = new Month(new Date(951868800000L), zone, locale);

        assertEquals(MonthConstants.FEBRUARY, m1.getMonth());
        assertEquals(951868799999L, m1.getLastMillisecond(c));

        assertEquals(MonthConstants.MARCH, m2.getMonth());
        assertEquals(951868800000L, m2.getFirstMillisecond(c));

    }

    /**
     * In Auckland, the end of Feb 2000 is java.util.Date(951,821,999,999L).
     * Use this to check the Month constructor.
     */
    @Test
    public void testDateConstructor2() {

        TimeZone zone = TimeZone.getTimeZone("Pacific/Auckland");
        Calendar c = new GregorianCalendar(zone);
        Month m1 = new Month(new Date(951821999999L), zone, Locale.UK);
        Month m2 = new Month(new Date(951822000000L), zone, Locale.UK);

        assertEquals(MonthConstants.FEBRUARY, m1.getMonth());
        assertEquals(951821999999L, m1.getLastMillisecond(c));

        assertEquals(MonthConstants.MARCH, m2.getMonth());
        assertEquals(951822000000L, m2.getFirstMillisecond(c));

    }

    /**
     * Set up a month equal to Jan 1900.  Request the previous month, it should
     * be null.
     */
    @Test
    public void testJan1900Previous() {
        Month previous = (Month) this.jan1900.previous();
        assertNull(previous);
    }

    /**
     * Set up a month equal to Jan 1900.  Request the next month, it should be
     * Feb 1900.
     */
    @Test
    public void testJan1900Next() {
        Month next = (Month) this.jan1900.next();
        assertEquals(this.feb1900, next);
    }

    /**
     * Set up a month equal to Dec 9999.  Request the previous month, it should
     * be Nov 9999.
     */
    @Test
    public void testDec9999Previous() {
        Month previous = (Month) this.dec9999.previous();
        assertEquals(this.nov9999, previous);
    }

    /**
     * Set up a month equal to Dec 9999.  Request the next month, it should be
     * null.
     */
    @Test
    public void testDec9999Next() {
        Month next = (Month) this.dec9999.next();
        assertNull(next);
    }

    /**
     * Tests the string parsing code...
     */
    @Test
    public void testParseMonth() {

        Month month = Month.parseMonth("1990-01");

        assertEquals(1, month.getMonth());
        assertEquals(1990, month.getYear().getYear());

        month = Month.parseMonth("02-1991");

        assertEquals(2, month.getMonth());
        assertEquals(1991, month.getYear().getYear());

        month = Month.parseMonth(DATE_FORMAT_SYMBOLS.getMonths()[2] + " 1993");

        assertEquals(3, month.getMonth());
        assertEquals(1993, month.getYear().getYear());

    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    @Test
    public void testSerialization() throws IOException, ClassNotFoundException {

        Month m1 = new Month(12, 1999);

            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(m1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
        Month m2 = (Month) in.readObject();
            in.close();

        assertEquals(m1, m2);

    }

    /**
     * Two objects that are equal are required to return the same hashCode.
     */
    @Test
    public void testHashcode() {
        Month m1 = new Month(2, 2003);
        Month m2 = new Month(2, 2003);
        assertEquals(m1, m2);
        int h1 = m1.hashCode();
        int h2 = m2.hashCode();
        assertEquals(h1, h2);
    }

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

    /**
     * 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"));
        Month m = new Month(3, 1970);
        assertEquals(5094000000L, m.getFirstMillisecond());
        Locale.setDefault(saved);
        TimeZone.setDefault(savedZone);
    }

    /**
     * Some checks for the getFirstMillisecond(TimeZone) method.
     */
    @Test
    public void testGetFirstMillisecondWithTimeZone() {
        Month m = new Month(2, 1950);
        TimeZone zone = TimeZone.getTimeZone("America/Los_Angeles");
        Calendar c = new GregorianCalendar(zone);
        assertEquals(-628444800000L, m.getFirstMillisecond(c));

        // try null calendar
        try {
            m.getFirstMillisecond(null);
            fail("NullPointerException should have been thrown on null parameter");
        }
        catch (NullPointerException e) {
            //we expect to go in here
        }
    }

    /**
     * Some checks for the getFirstMillisecond(TimeZone) method.
     */
    @Test
    public void testGetFirstMillisecondWithCalendar() {
        Month m = new Month(1, 2001);
        GregorianCalendar calendar = new GregorianCalendar(Locale.GERMANY);
        calendar.setTimeZone(TimeZone.getTimeZone("Europe/Frankfurt"));
        assertEquals(978307200000L, m.getFirstMillisecond(calendar));

        // try null calendar
        try {
            m.getFirstMillisecond(null);
            fail("NullPointerException should have been thrown on null parameter");
        }
        catch (NullPointerException e) {
            // we expect to go in here
        }
    }

    /**
     * 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"));
        Month m = new Month(3, 1970);
        assertEquals(7772399999L, m.getLastMillisecond());
        Locale.setDefault(saved);
        TimeZone.setDefault(savedZone);
    }

    /**
     * Some checks for the getLastMillisecond(TimeZone) method.
     */
    @Test
    public void testGetLastMillisecondWithTimeZone() {
        Month m = new Month(2, 1950);
        TimeZone zone = TimeZone.getTimeZone("America/Los_Angeles");
        Calendar c = new GregorianCalendar(zone);
        assertEquals(-626025600001L, m.getLastMillisecond(c));

        // try null calendar
        try {
            m.getLastMillisecond(null);
            fail("NullPointerException should have been thrown on null parameter");
        }
        catch (NullPointerException e) {
            // we expect to go in here
        }
    }

    /**
     * Some checks for the getLastMillisecond(TimeZone) method.
     */
    @Test
    public void testGetLastMillisecondWithCalendar() {
        Month m = new Month(3, 2001);
        GregorianCalendar calendar = new GregorianCalendar(Locale.GERMANY);
        calendar.setTimeZone(TimeZone.getTimeZone("Europe/Frankfurt"));
        assertEquals(986083199999L, m.getLastMillisecond(calendar));

        // try null calendar
        try {
            m.getLastMillisecond(null);
            fail("NullPointerException should have been thrown on null parameter");
        }
        catch (NullPointerException e) {
            //we expect to go in here
        }
    }

    /**
     * Some checks for the getSerialIndex() method.
     */
    @Test
    public void testGetSerialIndex() {
        Month m = new Month(1, 2000);
        assertEquals(24001L, m.getSerialIndex());
        m = new Month(1, 1900);
        assertEquals(22801L, m.getSerialIndex());
    }

    /**
     * Some checks for the testNext() method.
     */
    @Test
    public void testNext() {
        Month m = new Month(12, 2000);
        m = (Month) m.next();
        assertEquals(new Year(2001), m.getYear());
        assertEquals(1, m.getMonth());
        m = new Month(12, 9999);
        assertNull(m.next());
    }

    /**
     * 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.MARCH, 1, 0, 0, 0);
        cal.set(Calendar.MILLISECOND, 0);
        Month m = new Month(3, 2006);
        assertEquals(cal.getTime(), m.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(2006, Calendar.JANUARY, 31, 23, 59, 59);
        cal.set(Calendar.MILLISECOND, 999);
        Month m = new Month(1, 2006);
        assertEquals(cal.getTime(), m.getEnd());
        Locale.setDefault(saved);
    }

}
