/**
 * Copyright (C) 2017-2018 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.model.stats;

import java.time.format.DateTimeFormatter;
import java.util.Locale;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class ReviewStatReporter.
 */
public class ReviewStatsReporter
{
    private static final Logger logger = LoggerFactory.getLogger(ReviewStatsReporter.class);

    /**
     * Instantiates a new review stat reporter.
     */
    private ReviewStatsReporter()
    {
    }

    /**
     * Percent.
     *
     * @param a
     *            the a
     * @param b
     *            the b
     * @return the double
     */
    private static double percent(final double a, final double b)
    {
        double result;

        if (b == 0.)
        {
            result = 0.;
        }
        else
        {
            result = Math.round(10000. * (a / b)) / 100.;
        }

        //
        return result;
    }

    /**
     * Percent.
     *
     * @param a
     *            the a
     * @param b
     *            the b
     * @return the double
     */
    private static double percent(final int a, final int b)
    {
        double result;

        result = percent(new Double(a).doubleValue(), new Double(b).doubleValue());

        //
        return result;
    }

    /**
     * Report duration.
     *
     * @param datas
     *            the datas
     * @param currentDuration
     *            the current duration
     * @return the string
     */
    public static String reportDuration(final ReviewDatas datas, final int currentDuration)
    {
        String result;

        IntegerBoard board = new IntegerBoard();
        for (ReviewData data : datas)
        {
            board.add(data.getDuration());
        }
        logger.debug("Duration board: " + board.toString());

        IntegerStat stat = board.get(currentDuration);
        int total = board.getCountSum();
        result = String.format(
                "Statistiques sur la durée de la revue (%d min) : position %d (min.=%d min, moy.=%.1f min, max.=%d min), fréquence %d/%d (%.0f %%)",
                stat.getValue(), board.getPositionOf(stat.getValue()), board.getMinValue(), board.getAverage(), board.getMaxValue(), stat.getCount(),
                total, percent(stat.getCount(), total));

        //
        return result;
    }

    /**
     * Report duration board.
     *
     * @param datas
     *            the datas
     * @return the string
     */
    public static String reportDurationBoard(final ReviewDatas datas)
    {
        String result;

        IntegerBoard board = new IntegerBoard();
        for (ReviewData data : datas)
        {
            board.add(data.getDuration());
        }
        result = "Tableau des durées (mn) : " + board.toString();

        //
        return result;
    }

    /**
     * Report new max.
     *
     * @param datas
     *            the datas
     * @param currentUserCount
     *            the current user count
     * @return the string
     */
    public static String reportNewMaxUserCount(final ReviewDatas datas, final int currentUserCount)
    {
        String result;

        datas.sortByDate();
        ReviewData last = datas.getLastByMaxUserCount();
        if (currentUserCount == last.getUserCount())
        {
            result = "Record de participation égalé.";
        }
        else if (currentUserCount < last.getUserCount())
        {
            result = "Pas de nouveau record de participation.";
        }
        else
        {
            result = "Nombre record de personnes participantes !";
        }

        String lastRecordDate = last.getDate().format(DateTimeFormatter.ofPattern("EEEE dd MMMM yyyy", Locale.FRENCH));
        result = String.format("%s Le dernier record de %d personnes participantes remonte au %s.", result, last.getUserCount(), lastRecordDate);

        //
        return result;
    }

    /**
     * Report user count.
     *
     * @param datas
     *            the datas
     * @param currentUserCount
     *            the current user count
     * @return the string
     */
    public static String reportUserCount(final ReviewDatas datas, final int currentUserCount)
    {
        String result;

        IntegerBoard board = new IntegerBoard();
        for (ReviewData data : datas)
        {
            board.add(data.getUserCount());
        }
        logger.debug("User count board: " + board.toString());

        IntegerStat stat = board.get(currentUserCount);
        int total = board.getCountSum();
        result = String.format(
                "Statistiques sur la participation à la revue (%d personnes) : position %d (min.=%d, moy.=%.1f, max.=%d), fréquence %d/%d (%.0f %%)",
                stat.getValue(), board.getPositionOf(stat.getValue()), board.getMinValue(), board.getAverage(), board.getMaxValue(), stat.getCount(),
                total, percent(stat.getCount(), total));

        //
        return result;
    }

    /**
     * Report user count board.
     *
     * @param datas
     *            the datas
     * @return the string
     */
    public static String reportUserCountBoard(final ReviewDatas datas)
    {
        String result;

        IntegerBoard board = new IntegerBoard();
        for (ReviewData data : datas)
        {
            board.add(data.getDuration());
        }
        result = "Tableau du nombre de personnes participantes : " + board.toString();

        //
        return result;
    }
}