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/*
 * Copyright (c) 2009 Albert Kurucz. 
 *
 * This file, DayOfWeekInMonthRule.java is part of JTStand.
 *
 * JTStand 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 3 of the License, or
 * (at your option) any later version.
 *
 * JTStand 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 GTStand.  If not, see .
 */

package org.jfree.date;

/**
 * An annual date rule that specifies the nth day of the week in a given month
 * (for example, the third Wednesday in June, or the last Friday in November).
 *
 * @author David Gilbert
 */
public class DayOfWeekInMonthRule extends AnnualDateRule {

    /** FIRST, SECOND, THIRD, FOURTH or LAST. */
    private int count;

    /** The day of the week (SerialDate.MONDAY, SerialDate.TUESDAY...). */
    private int dayOfWeek;

    /** The month (1 to 12, or SerialDate.JANUARY, SerialDate.FEBRUARY...). */
    private int month;

    /**
     * Default constructor: builds a rule for the first Monday in January by default.
     */
    public DayOfWeekInMonthRule() {
        this(1, SerialDate.MONDAY, MonthConstants.JANUARY);
    }

    /**
     * Standard constructor: builds a rule with the specified attributes.
     *
     * @param count  one of: FIRST, SECOND, THIRD, FOURTH or LAST.
     * @param dayOfWeek  the day-of-the-week (SerialDate.MONDAY, SerialDate.TUESDAY, etc.).
     * @param month  the month (SerialDate.JANUARY, SerialDate.FEBRUARY, etc.).
     */
    public DayOfWeekInMonthRule(final int count, final int dayOfWeek, final int month) {
        this.count = count;
        this.dayOfWeek = dayOfWeek;
        this.month = month;
    }

    /**
     * Returns the 'count' for this rule (one of FIRST, SECOND, THIRD, FOURTH and LAST).
     *
     * @return the 'count'.
     */
    public int getCount() {
        return this.count;
    }

    /**
     * Sets the 'count' for this rule (one of FIRST, SECOND, THIRD, FOURTH and LAST).
     *
     * @param count the 'count'.
     */
    public void setCount(final int count) {
        this.count = count;
    }

    /**
     * Returns the day-of-the-week for this rule (SerialDate.MONDAY, SerialDate.TUESDAY, etc.).
     *
     * @return the day-of-the-week.
     */
    public int getDayOfWeek() {
        return this.dayOfWeek;
    }

    /**
     * Sets the day-of-the-week for this rule.
     *
     * @param dayOfWeek  the day-of-the-week.
     */
    public void setDayOfWeek(final int dayOfWeek) {
        this.dayOfWeek = dayOfWeek;
    }

    /**
     * Returns the month for this rule.
     *
     * @return the month.
     */
    public int getMonth() {
        return this.month;
    }

    /**
     * Sets the month for this rule.
     *
     * @param month  the month (SerialDate.JANUARY, SerialDate.FEBRUARY, etc.).
     */
    public void setMonth(final int month) {
        this.month = month;
    }

    /**
     * Return the date for this rule, given the year.
     *
     * @param year  the year.
     *
     * @return the date generated by the rule for the given year.
     */
    public SerialDate getDate(final int year) {
        SerialDate result;
        if (this.count != SerialDate.LAST_WEEK_IN_MONTH) {
            // start at the beginning of the month
            result = SerialDate.createInstance(1, this.month, year);
            while (result.getDayOfWeek() != this.dayOfWeek) {
                result = SerialDate.addDays(1, result);
            }
            result = SerialDate.addDays(7 * (this.count - 1), result);

        }
        else {
            // start at the end of the month and work backwards...
            result = SerialDate.createInstance(1, this.month, year);
            result = result.getEndOfCurrentMonth(result);
            while (result.getDayOfWeek() != this.dayOfWeek) {
                result = SerialDate.addDays(-1, result);
            }

        }
        return result;
    }

}