/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

/**

 * @file

 * @brief ThemeModel class implementation

 */

#include "physfs.h"

#include "ThemeModel.h"

#include "hwconsts.h"

ThemeModel::ThemeModel(QObject *parent) :

    QAbstractListModel(parent)

{

    m_data = QList<QMap<int, QVariant> >();

    m_themesLoaded = false;

    m_filteredNoDLC = NULL;

    m_filteredNoHidden = NULL;

    m_filteredNoDLCOrHidden = NULL;

}

// Filters out DLC themes, e.g. themes which do not come by default

ThemeFilterProxyModel * ThemeModel::withoutDLC()

{

    if (m_filteredNoDLC == NULL)

    {

        m_filteredNoDLC = new ThemeFilterProxyModel(this);

        m_filteredNoDLC->setSourceModel(this);

        m_filteredNoDLC->setFilterDLC(true);

    }

    return m_filteredNoDLC;

}

// Filters out hidden themes, these are themes which are not supposed to be

// seen by the user.

ThemeFilterProxyModel * ThemeModel::withoutHidden()

{

    if (m_filteredNoHidden == NULL)

    {

        m_filteredNoHidden = new ThemeFilterProxyModel(this);

        m_filteredNoHidden->setSourceModel(this);

        m_filteredNoHidden->setFilterHidden(true);

    }

    return m_filteredNoHidden;

}

// Combination of the two above for convenience

ThemeFilterProxyModel * ThemeModel::withoutDLCOrHidden()

{

    if (m_filteredNoDLCOrHidden == NULL)

    {

        m_filteredNoDLCOrHidden = new ThemeFilterProxyModel(this);

        m_filteredNoDLCOrHidden->setSourceModel(this);

        m_filteredNoDLCOrHidden->setFilterDLC(true);

        m_filteredNoDLCOrHidden->setFilterHidden(true);

    }

    return m_filteredNoDLCOrHidden;

}

int ThemeModel::rowCount(const QModelIndex &parent) const

{

    if(parent.isValid())

        return 0;

    else

    {

        if(!m_themesLoaded)

            loadThemes();

        return m_data.size();

    }

}

QVariant ThemeModel::data(const QModelIndex &index, int role) const

{

    if(index.column() > 0 || index.row() >= m_data.size())

        return QVariant();

    else

    {

        if(!m_themesLoaded)

            loadThemes();

        return m_data.at(index.row()).value(role);

    }

}

void ThemeModel::loadThemes() const

{

    qDebug("[LAZINESS] ThemeModel::loadThemes()");

    m_themesLoaded = true;

    DataManager & datamgr = DataManager::instance();

    QStringList themes =

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

    m_data.clear();

#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)

    m_data.reserve(themes.size());

#endif

    foreach (QString theme, themes)

    {

        QMap<int, QVariant> dataset;

        // Ignore directories without theme.cfg

        QFile themeCfgFile(QString("physfs://Themes/%1/theme.cfg").arg(theme));

        if (!themeCfgFile.open(QFile::ReadOnly))

        {

            continue;

        }

        // themes without icon are supposed to be hidden

        QString iconpath = QString("physfs://Themes/%1/icon.png").arg(theme);

        if (!QFile::exists(iconpath))

        {

            dataset.insert(IsHiddenRole, true);

        }

        else

        {

            QTextStream stream(&themeCfgFile);

            QString line = stream.readLine();

            QString key;

            while (!line.isNull())

            {

                key = QString(line);

                int equalsPos = line.indexOf('=');

                key.truncate(equalsPos - 1);

                key = key.simplified();

                if (!line.startsWith(';') && key == "hidden")

                {

                    dataset.insert(IsHiddenRole, true);

                    break;

                }

                line = stream.readLine();

            }

        }

        // Themes without land textures are considered "background themes"

        // since they cannot be used for generated maps, but they can be used

        // for image maps.

        QString landtexpath = QString("physfs://Themes/%1/LandTex.png").arg(theme);

        QString bordertexpath = QString("physfs://Themes/%1/Border.png").arg(theme);

        if ((!QFile::exists(landtexpath)) || (!QFile::exists(bordertexpath)))

        {

            dataset.insert(IsBackgroundThemeRole, true);

        }

        // detect if theme is dlc

        QString themeDir = PHYSFS_getRealDir(QString("Themes/%1").arg(theme).toLocal8Bit().data());

        bool isDLC = !themeDir.startsWith(datadir->absolutePath());

        dataset.insert(IsDlcRole, isDLC);

        // set icon path

        dataset.insert(IconPathRole, iconpath);

        // set name

        dataset.insert(ActualNameRole, theme);

        // set displayed name

        dataset.insert(Qt::DisplayRole, (isDLC ? "*" : "") + theme);

        // load and set preview icon

        iconpath = QString("physfs://Themes/%1/icon@2x.png").arg(theme);

        if (QFile::exists(iconpath))

        {

            QIcon preview(QString("physfs://Themes/%1/icon@2x.png").arg(theme));

            dataset.insert(Qt::DecorationRole, preview);

        }

        m_data.append(dataset);

        themeCfgFile.close();

    }

}