/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@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; version 2 of the License

 *

 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

/**

 * @file

 * @brief MapModel class implementation

 */

#include "MapModel.h"

void MapModel::loadMaps()

{

    // this method resets the contents of this model (important to know for views).

    beginResetModel();

    // we'll need the DataManager a few times, so let's get a reference to it

    DataManager & datamgr = DataManager::instance();

    // fetch list of available maps

    QStringList maps =

        datamgr.entryList("Maps", QDir::AllDirs | QDir::NoDotAndDotDot);

    // empty list, so that we can (re)fill it

    QStandardItemModel::clear();

    QList<QStandardItem *> genMaps;

    QList<QStandardItem *> missionMaps;

    QList<QStandardItem *> staticMaps;

    // add generated/handdrawn maps to list

    // TODO: icons for these

    genMaps.append(

        infoToItem(QIcon(), QComboBox::tr("generated map..."), GeneratedMap, "+rnd+"));

    genMaps.append(

        infoToItem(QIcon(), QComboBox::tr("generated maze..."), GeneratedMaze, "+maze+"));

    genMaps.append(

        infoToItem(QIcon(), QComboBox::tr("hand drawn map..."), HandDrawnMap, "+drawn+"));

    // only 2 map relate files are relevant:

    // - the cfg file that contains the settings/info of the map

    // - the lua file - if it exists it's a mission, otherwise it isn't

    QFile mapLuaFile;

    QFile mapCfgFile;

    // add mission/static maps to lists

    foreach (QString map, maps)

    {

        mapCfgFile.setFileName(

            datamgr.findFileForRead(QString("Maps/%1/map.cfg").arg(map)));

        mapLuaFile.setFileName(

            datamgr.findFileForRead(QString("Maps/%1/map.lua").arg(map)));

        if (mapCfgFile.open(QFile::ReadOnly))

        {

            QString caption;

            QString theme;

            quint32 limit = 0;

            QString scheme;

            QString weapons;

            // if there is a lua file for this map, then it's a mission

            bool isMission = mapLuaFile.exists();

            MapType type = isMission?MissionMap:StaticMap;

            // load map info from file

            QTextStream input(&mapCfgFile);

            input >> theme;

            input >> limit;

            if (isMission) { // scheme and weapons are only relevant for missions

                input >> scheme;

                input >> weapons;

            }

            mapCfgFile.close();

            // let's use some semi-sane hedgehog limit, rather than none

            if (limit == 0)

                limit = 18;

            // the default scheme/weaponset for missions.

            // if empty we assume the map sets these internally -> locked

            if (isMission)

            {

                if (scheme.isEmpty())

                    scheme = "locked";

                else

                    scheme.replace("_", " ");

                if (weapons.isEmpty())

                    weapons = "locked";

                else

                    weapons.replace("_", " ");

            }

            // add a mission caption prefix to missions

            if (isMission)

            {

                // TODO: icon

                caption = QComboBox::tr("Mission") + ": " + map;

            }

            else

                caption = map;

            // we know everything there is about the map, let's get am item for it

            QStandardItem * item = infoToItem(

                QIcon(), caption, type, map, theme, limit, scheme, weapons);

            // append item to the list

            if (isMission)

                missionMaps.append(item);

            else

                staticMaps.append(item);

        }

    }

    // define a separator item

    QStandardItem separator("---");

    separator.setData(QLatin1String("separator"), Qt::AccessibleDescriptionRole);

    separator.setFlags(separator.flags() & ~( Qt::ItemIsEnabled | Qt::ItemIsSelectable ) );

    // create list:

    // generated+handdrawn maps, 2 saperators, missions, 1 separator, static maps

    QList<QStandardItem * > items;

    items.append(genMaps);

    items.append(separator.clone());

    items.append(separator.clone());

    items.append(missionMaps);

    items.append(separator.clone());

    items.append(staticMaps);

    // create row-index lookup table

    m_mapIndexes.clear();

    int count = items.size();

    for (int i = 0; i < count; i++)

    {

        QStandardItem * si = items.at(i);

        QVariant v = si->data(Qt::UserRole + 1);

        if (v.canConvert<MapInfo>())

            m_mapIndexes.insert(v.value<MapInfo>().name, i);

    }

    // store start-index and count of relevant types

    m_typeLoc.insert(GeneratedMap, QPair<int,int>(0, 1));

    m_typeLoc.insert(GeneratedMaze, QPair<int,int>(1, 1));

    m_typeLoc.insert(HandDrawnMap, QPair<int,int>(2, 1));

    // mission maps

    int startIdx = genMaps.size() + 2; // start after genMaps and 2 separators

    count = missionMaps.size();

    m_typeLoc.insert(MissionMap, QPair<int,int>(startIdx, count));

    // static maps

    startIdx += count + 1; // start after missions and 2 separators

    count = staticMaps.size();

    m_typeLoc.insert(StaticMap, QPair<int,int>(startIdx, count));

    // store list contents in the item model

    QStandardItemModel::appendColumn(items);

    endResetModel();

}

int MapModel::randomMap(MapType type) const

{

    // return a random index for this type or -1 if none available

    QPair<int,int> loc = m_typeLoc.value(type, QPair<int,int>(-1,0));

    int startIdx = loc.first;

    int count = loc.second;

    if (count < 1)

        return -1;

    else

        return startIdx + (rand() % count);

}

QStandardItem * MapModel::infoToItem(

    const QIcon & icon,

    const QString caption,

    MapType type,

    QString name,

    QString theme,

    quint32 limit,

    QString scheme,

    QString weapons)

const

{

    QStandardItem * item = new QStandardItem(icon, caption);

    MapInfo mapInfo;

    QVariant qvar(QVariant::UserType);

    mapInfo.type = type;

    mapInfo.name = name;

    mapInfo.theme = theme;

    mapInfo.limit = limit;

    mapInfo.scheme = scheme;

    mapInfo.weapons = weapons;

    qvar.setValue(mapInfo);

    item->setData(qvar, Qt::UserRole + 1);

    return item;

}

int MapModel::indexOf(const QString & map) const

{

    return m_mapIndexes.value(map, -1);

}