/*****************************************************************************
 * Eliot
 * Copyright (C) 1999-2012 Antoine Fraboulet & Olivier Teulière
 * Authors: Antoine Fraboulet <antoine.fraboulet @@ free.fr>
 *          Olivier Teulière <ipkiss @@ gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *****************************************************************************/

#include <boost/foreach.hpp>

#include <cstdlib> // For rand()

#include <dic.h>
#include "bag.h"
#include "debug.h"
#include "encoding.h"


INIT_LOGGER(game, Bag);


Bag::Bag(const Dictionary &iDic)
    : m_dic(iDic), m_nbTiles(0)
{
    BOOST_FOREACH(const Tile &tile, m_dic.getAllTiles())
    {
        m_tilesMap[tile] = tile.maxNumber();
        m_nbTiles += tile.maxNumber();
    }
}


unsigned Bag::count(const Tile &iTile) const
{
    map<Tile, int>::const_iterator it = m_tilesMap.find(iTile);
    if (it != m_tilesMap.end())
        return it->second;
    return 0;
}


unsigned Bag::getNbVowels() const
{
    int v = 0;

    std::pair<Tile, int> p;
    BOOST_FOREACH(p, m_tilesMap)
    {
        if (p.first.isVowel())
            v += p.second;
    }
    return v;
}


unsigned Bag::getNbConsonants() const
{
    int c = 0;

    std::pair<Tile, int> p;
    BOOST_FOREACH(p, m_tilesMap)
    {
        if (p.first.isConsonant())
            c += p.second;
    }
    return c;
}


void Bag::takeTile(const Tile &iTile)
{
    ASSERT(contains(iTile),
           "The bag does not contain the letter " + lfw(iTile.getDisplayStr()));

    m_tilesMap[iTile]--;
    m_nbTiles--;
}


void Bag::replaceTile(const Tile &iTile)
{
    ASSERT(count(iTile) < iTile.maxNumber(),
           "Cannot replace tile: " + lfw(iTile.getDisplayStr()));

    m_tilesMap[iTile]++;
    m_nbTiles++;
}


Tile Bag::selectRandom() const
{
    return selectRandomTile(m_nbTiles, false, false);
}


Tile Bag::selectRandomVowel() const
{
    return selectRandomTile(getNbVowels(), true, false);
}


Tile Bag::selectRandomConsonant() const
{
    return selectRandomTile(getNbConsonants(), false, true);
}


Tile Bag::selectRandomTile(unsigned total,
                           bool onlyVowels, bool onlyConsonants) const
{
    ASSERT(total > 0, "Not enough tiles (of the requested kind) in the bag");

    int n = (int)((double)total * rand() / (RAND_MAX + 1.0));
    std::pair<Tile, int> p;
    BOOST_FOREACH(p, m_tilesMap)
    {
        if (onlyVowels && !p.first.isVowel())
            continue;
        if (onlyConsonants && !p.first.isConsonant())
            continue;
        if (n < p.second)
            return p.first;
        n -= p.second;
    }
    ASSERT(false, "We should not come here");
    return Tile();
}


Bag & Bag::operator=(const Bag &iOther)
{
    m_tilesMap = iOther.m_tilesMap;
    m_nbTiles = iOther.m_nbTiles;
    return *this;
}