/**

  * Copyright 2010 Sven Diedrichsen 

  * 

  * Licensed under the Apache License, Version 2.0 (the "License"); 

  * you may not use this file except in compliance with the License. 

  * You may obtain a copy of the License at 

  * 

  * http://www.apache.org/licenses/LICENSE-2.0 

  * 

  * Unless required by applicable law or agreed to in writing, software 

  * distributed under the License is distributed on an 

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 

  * express or implied. See the License for the specific language 

  * governing permissions and limitations under the License. 

  */

 package de.jollyday.parser.impl;

 import java.time.LocalDate;

 import java.util.Set;

 import de.jollyday.Holiday;

 import de.jollyday.HolidayType;

 import de.jollyday.config.FixedWeekdayRelativeToFixed;

 import de.jollyday.config.Holidays;

 import de.jollyday.config.When;

 import de.jollyday.parser.AbstractHolidayParser;

 /**

  * Parses fixed weekday relative to fixed date.

  * 

  * @author Sven Diedrichsen

  * @version $Id: $

  */

 public class FixedWeekdayRelativeToFixedParser extends AbstractHolidayParser {

         /**

          * Parses the provided configuration and creates holidays for the provided

          * year.

          */

         @Override

         public void parse(int year, Set<Holiday> holidays, final Holidays config) {

                 for (FixedWeekdayRelativeToFixed f : config.getFixedWeekdayRelativeToFixed()) {

                         if (!isValid(f, year)) {

                                 continue;

                         }

                         LocalDate day = calendarUtil.create(year, f.getDay());

                         day = moveDateToFirstOccurenceOfWeekday(f, day);

                         int days = determineNumberOfDays(f);

                         day = f.getWhen() == When.AFTER ? day.plusDays(days) : day.minusDays(days);

                         HolidayType type = xmlUtil.getType(f.getLocalizedType());

                         holidays.add(new Holiday(day, f.getDescriptionPropertiesKey(), type));

                 }

         }

         /**

          * Moves the day to the first/next occurrence of the weekday and direction specified 

          * @param f the specification of the weekday and direction of movement

          * @param day the day to move

          * @return the day moved to the weekday and in the direction as specified 

          */

         private LocalDate moveDateToFirstOccurenceOfWeekday(FixedWeekdayRelativeToFixed f, LocalDate day) {

                 LocalDate movingDay = day;

                 do {

                         movingDay = f.getWhen() == When.AFTER ? movingDay.plusDays(1) : movingDay.minusDays(1);

                 } while (movingDay.getDayOfWeek() != xmlUtil.getWeekday(f.getWeekday()));

                 return movingDay;

         }

         /**

          * Determines the number of days to move from the XML enumeration.

          * @param f the enumeration value

          * @return the number of days

          */

         private int determineNumberOfDays(FixedWeekdayRelativeToFixed f) {

                 switch (f.getWhich()) {

                 case SECOND:

                         return 7;

                 case THIRD:

                         return 14;

                 case FOURTH:

                         return 21;

                 default:

                         return 0;

                 }

         }

 }