/*
 * [ArmedForcesDay.java]
 *
 * Summary: calculate when Armed Forces day occurs.
 *
 * Copyright: (c) 1999-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  4.2 2008-12-03 add World AIDS day
 */
package com.mindprod.holidays;

import com.mindprod.common18.BigDate;
// com.mindprod.holidays.ArmedForcesDay

/**
 * calculate when Armed Forces day occurs.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 4.2 2008-12-03 add World AIDS day
 * @since 1999
 */
public final class ArmedForcesDay extends HolInfo
    {
    /**
     * @inheritDoc
     */
    public String getAuthority()
        {
        return "http://www.optonline.com/comptons/ceo/07180_Q.html";
        }

    /**
     * @inheritDoc
     */
    public int getFirstYear( int base )
        {
        switch ( base )
            {
            default:
            case OBSERVED:
                return 1936;
            case PROCLAIMED:
                return 1950;
            }
        }

    /**
     * @inheritDoc
     */
    public String getName()
        {
        return "Armed Forces Day";
        }

    /**
     * @inheritDoc
     */
    public String getRule()
        {
        return "Third Saturday in May\n"
               + "Originally Army Day, celebrated on April 6 (1936-49)\n"
               + "Proclaimed as Armed Forces day in 1950.";
        }

    /**
     * @inheritDoc
     */
    public int when( int year, boolean shift, int base )
        {
        if ( !isYearValid( year, base ) )
            {
            return BigDate.NULL_ORDINAL;
            }
        if ( 1936 <= year && year <= 1949 )
            {
            return shiftSatToFriSunToMon( BigDate.toOrdinal( year, 4, 6 ),
                    shift );
            }
        else
            {
            return shiftSatToFriSunToMon( BigDate.ordinalOfnthXXXDay( 3
                    ,
                    BigDate.SATURDAY,
                    year,
                    BigDate.MAY ),
                    shift
            );
            }
        } // end when.
    }