/*
 * Copyright 2008 Ben Boeckel <MathStuf@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 3 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, see <http://www.gnu.org/licenses/>.
 */

// Header include
#include "PokemodTreeModel.h"

// Model includes
#include "models/RootModel.h"

// Qt includes
#include <QDomDocument>
#include <QMimeData>

PokemodTreeModel::PokemodTreeModel(const QStringList& pokemods, QObject* parent) :
        QAbstractItemModel(parent)
{
    emit(layoutAboutToBeChanged());
    m_root = new RootModel(QList<QVariant>());
    emit(layoutChanged());
}

PokemodTreeModel::~PokemodTreeModel()
{
    delete m_root;
}

QVariant PokemodTreeModel::data(const QModelIndex& index, int role) const
{
    if (!index.isValid())
        return QVariant();
    BaseModel* object = static_cast<BaseModel*>(index.internalPointer());
    return object->data(role);
}

QVariant PokemodTreeModel::headerData(int /*section*/, Qt::Orientation /*orientation*/, int /*role = Qt::DisplayRole*/) const
{
    return QVariant();
}

QModelIndex PokemodTreeModel::index(int row, int /*column*/, const QModelIndex& parent) const
{
    if (row < 0)
        return createIndex(row, 0, m_root);
    BaseModel* object = getItem(parent)->childItem(row);
    return createIndex(row, 0, object);
}

QModelIndex PokemodTreeModel::parent(const QModelIndex& index) const
{
    if (!index.isValid())
        return QModelIndex();
    BaseModel* object = static_cast<BaseModel*>(index.internalPointer());
    BaseModel* parent = object->parent();
    if (!parent || (parent == m_root))
        return QModelIndex();
    return createIndex(parent->indexNumber(), 0, parent);
}

int PokemodTreeModel::rowCount(const QModelIndex& parent) const
{
    BaseModel* object = getItem(parent);
    return object->rowCount();
}

int PokemodTreeModel::columnCount(const QModelIndex& /*parent*/) const
{
    return 1;
}

Qt::ItemFlags PokemodTreeModel::flags(const QModelIndex& index) const
{
    if (!index.isValid())
        return 0;
    BaseModel* object = static_cast<BaseModel*>(index.internalPointer());
    return object->flags();
}

bool PokemodTreeModel::setData(const QModelIndex& index, const QVariant& value, int role)
{
    if (!index.isValid())
        return false;
    BaseModel* object = static_cast<BaseModel*>(index.internalPointer());
    emit(layoutAboutToBeChanged());
    bool success = object->setData(value, role);
    emit(dataChanged(index, index));
    emit(layoutChanged());
    return success;
}

bool PokemodTreeModel::insertRows(int /*position*/, int rows, const QModelIndex& parent)
{
    BaseModel* object = getItem(parent);
    if (!object->canInsertRows())
        return false;
    emit(layoutAboutToBeChanged());
    bool success = object->insertRows(rows);
    emit(layoutChanged());
    return success;
}

bool PokemodTreeModel::removeRows(int position, int rows, const QModelIndex& parent)
{
    BaseModel* object = getItem(parent);
    if (!object->canRemoveRows())
        return false;
    emit(layoutAboutToBeChanged());
    bool success = object->removeRows(position, rows);
    emit(layoutChanged());
    return success;
}

BaseModel* PokemodTreeModel::getItem(const QModelIndex& index) const
{
    if (index.isValid())
    {
        BaseModel* object = static_cast<BaseModel*>(index.internalPointer());
        if (object)
            return object;
    }
    return m_root;
}

QStringList PokemodTreeModel::mimeTypes() const
{
    return QStringList() << "application/x-pokemod+xml";
}

QMimeData* PokemodTreeModel::mimeData(const QModelIndexList& indexes) const
{
    QMimeData *mimeData = new QMimeData();
    if ((indexes.size() == 1) && indexes[0].isValid())
    {
        QDomDocument xml;
        xml.setContent(data(indexes[0], BaseModel::XmlRole).toString());
        mimeData->setData("application/x-pokemod+xml", xml.toByteArray());
    }
    return mimeData;
}

bool PokemodTreeModel::dropMimeData(const QMimeData* data, Qt::DropAction action, int /*row*/, int /*column*/, const QModelIndex& parent)
{
    if (action == Qt::IgnoreAction)
        return true;
    if (!data->hasFormat("application/x-pokemod+xml"))
        return false;
    if (parent.isValid())
        return setData(parent, data->data("application/x-pokemod+xml"), BaseModel::XmlRole);
    emit(layoutAboutToBeChanged());
    bool success = m_root->setData(data->data("application/x-pokemod+xml"), BaseModel::XmlRole);
    emit(layoutChanged());
    return success;
}