/**
 * Copyright (C) 2017-2019 Christian Pierre MOMON <cmomon@april.org>
 *
 * This file is part of (April) Hebdobot.
 *
 * Hebdobot is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Hebdobot 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Hebdobot.  If not, see <http://www.gnu.org/licenses/>
 */
package org.april.hebdobot.bot.stats;

import java.time.LocalDateTime;
import java.util.Comparator;

/**
 * The Class Stat.
 */
public class ReviewDataComparator implements Comparator<ReviewData>
{
    public enum Sorting
    {
        DATE,
        USERCOUNT,
        DURATION
    }

    private Sorting sorting;

    /**
     * Instantiates a new review data comparator.
     *
     * @param sorting
     *            the sorting
     */
    public ReviewDataComparator(final Sorting sorting)
    {
        this.sorting = sorting;
    }

    /* (non-Javadoc)
     * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(final ReviewData alpha, final ReviewData bravo)
    {
        int result;

        result = compare(alpha, bravo, this.sorting);

        //
        return result;
    }

    /**
     * Compare.
     *
     * @param alpha
     *            the alpha
     * @param bravo
     *            the bravo
     * @return the int
     */
    public static int compare(final Integer alpha, final Integer bravo)
    {
        int result;

        //
        if ((alpha == null) && (bravo == null))
        {
            result = 0;
        }
        else if (alpha == null)
        {
            result = -1;
        }
        else if (bravo == null)
        {
            result = +1;
        }
        else
        {
            result = alpha.compareTo(bravo);
        }

        //
        return result;
    }

    public static int compare(final LocalDateTime alpha, final LocalDateTime bravo)
    {
        int result;

        //
        if ((alpha == null) && (bravo == null))
        {
            result = 0;
        }
        else if (alpha == null)
        {
            result = -1;
        }
        else if (bravo == null)
        {
            result = +1;
        }
        else
        {
            result = alpha.compareTo(bravo);
        }

        //
        return result;
    }

    /**
     * Compare.
     *
     * @param alpha
     *            the alpha
     * @param bravo
     *            the bravo
     * @return the int
     */
    public static int compare(final Long alpha, final Long bravo)
    {
        int result;

        //
        if ((alpha == null) && (bravo == null))
        {
            result = 0;
        }
        else if (alpha == null)
        {
            result = -1;
        }
        else if (bravo == null)
        {
            result = +1;
        }
        else
        {
            result = alpha.compareTo(bravo);
        }

        //
        return result;
    }

    /**
     * Compare.
     *
     * @param alpha
     *            the alpha
     * @param bravo
     *            the bravo
     * @param sorting
     *            the sorting
     * @return the int
     */
    public static int compare(final ReviewData alpha, final ReviewData bravo, final Sorting sorting)
    {
        int result;

        if (sorting == null)
        {
            result = 0;
        }
        else
        {
            switch (sorting)
            {
                case DATE:
                    result = compare(getDate(alpha), getDate(bravo));
                break;

                case USERCOUNT:
                    result = compare(getUserCount(alpha), getUserCount(bravo));
                    if (result == 0)
                    {
                        result = compare(getDate(alpha), getDate(bravo));
                    }
                break;

                case DURATION:
                    result = compare(getDuration(alpha), getDuration(bravo));
                break;
                default:
                    result = 0;
            }
        }

        //
        return result;
    }

    /**
     * Gets the date.
     *
     * @param source
     *            the source
     * @return the date
     */
    public static LocalDateTime getDate(final ReviewData source)
    {
        LocalDateTime result;

        if (source == null)
        {
            result = null;
        }
        else
        {
            result = source.getDate();
        }

        //
        return result;
    }

    /**
     * Gets the duration.
     *
     * @param source
     *            the source
     * @return the duration
     */
    public static Long getDuration(final ReviewData source)
    {
        Long result;

        if (source == null)
        {
            result = null;
        }
        else
        {
            result = source.getDuration();
        }

        //
        return result;
    }

    /**
     * Gets the user count.
     *
     * @param source
     *            the source
     * @return the user count
     */
    public static Integer getUserCount(final ReviewData source)
    {
        Integer result;

        if (source == null)
        {
            result = null;
        }
        else
        {
            result = source.getUserCount();
        }

        //
        return result;
    }
}