/**
 * Copyright (C) 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.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import fr.devinsy.strings.StringList;

/**
 * The Class Integers.
 */
public class IntegerBoard implements Iterable<IntegerStat>
{
    private Map<Integer, IntegerStat> integers;
    private boolean isUptodate;
    private IntegerStats board;

    /**
     * Instantiates a new distribution.
     */
    public IntegerBoard()
    {
        this.integers = new HashMap<>(30);
        this.isUptodate = false;
        this.board = new IntegerStats(this.integers.size());
    }

    /**
     * Adds the.
     *
     * @param value
     *            the value
     */
    public void add(final Integer value)
    {
        if (value != null)
        {
            IntegerStat stat = this.integers.get(value);
            if (stat == null)
            {
                stat = new IntegerStat(value);
                this.integers.put(value, stat);
            }

            stat.inc();
        }
    }

    /**
     * Gets the.
     *
     * @param value
     *            the value
     * @return the integer stat
     */
    public IntegerStat get(final int value)
    {
        IntegerStat result;

        result = this.integers.get(value);

        //
        return result;
    }

    /**
     * Gets the average.
     *
     * @return the average
     */
    public double getAverage()
    {
        double result;

        int numerator = 0;
        int denumerator = 0;
        for (IntegerStat stat : this.integers.values())
        {
            numerator += stat.getCount() * stat.getValue();
            denumerator += stat.getCount();
        }
        result = (numerator * 1. / denumerator);

        //
        return result;
    }

    /**
     * Gets the count sum.
     *
     * @return the count sum
     */
    public int getCountSum()
    {
        int result;

        result = 0;
        for (IntegerStat stat : this.integers.values())
        {
            result += stat.getCount();
        }

        //
        return result;
    }

    public int getMaxValue()
    {
        int result;

        if (isEmpty())
        {
            result = 0;
        }
        else
        {
            result = Integer.MIN_VALUE;
            for (IntegerStat stat : this.integers.values())
            {
                if (stat.getValue() > result)
                {
                    result = stat.getValue();
                }
            }
        }

        //
        return result;
    }

    /**
     * Gets the min.
     *
     * @return the min
     */
    public int getMinValue()
    {
        int result;

        if (isEmpty())
        {
            result = 0;
        }
        else
        {
            result = Integer.MAX_VALUE;
            for (IntegerStat stat : this.integers.values())
            {
                if (stat.getValue() < result)
                {
                    result = stat.getValue();
                }
            }
        }

        //
        return result;
    }

    /**
     * Gets the position of board item.
     *
     * @param search
     *            the search
     * @return the position of
     */
    public Integer getPositionOf(final int search)
    {
        Integer result;

        update();

        int index = 0;
        boolean ended = false;
        result = null;
        while (!ended)
        {
            if (index < this.board.size())
            {
                int value = this.board.get(index).getValue();

                if (value == search)
                {
                    result = index + 1;
                    ended = true;
                }
                else
                {
                    index += 1;
                }
            }
            else
            {
                ended = true;
                result = null;
            }
        }

        //
        return result;
    }

    /**
     * Checks if is empty.
     *
     * @return true, if is empty
     */
    public boolean isEmpty()
    {
        boolean result;

        if (this.integers.size() == 0)
        {
            result = true;
        }
        else
        {
            result = false;
        }

        //
        return result;
    }

    /**
     * Iterator.
     *
     * @return the iterator
     */
    @Override
    public Iterator<IntegerStat> iterator()
    {
        Iterator<IntegerStat> result;

        update();
        result = this.board.iterator();

        //
        return result;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        String result;

        update();

        StringList buffer = new StringList();
        for (IntegerStat stat : this.board)
        {
            buffer.append(String.format("%d (%d)", stat.getValue(), stat.getCount()));
        }
        result = buffer.toStringWithBracket();

        //
        return result;
    }

    /**
     * Update.
     */
    public void update()
    {
        if (!this.isUptodate)
        {
            this.board.clear();
            for (IntegerStat stat : this.integers.values())
            {
                this.board.add(stat);
            }
            this.board.sortByValue();
            Collections.reverse(this.board);

            this.isUptodate = false;
        }
    }
}