/*
 * 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 "SigmodTreeModel.h"

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

// Sigmod includes
#include "../sigmod/Sigmod.h"

// Qt includes
#include <QtCore/QMimeData>
#include <QtCore/QStringList>
#include <QtXml/QDomDocument>

Sigmodr::SigmodTreeModel::SigmodTreeModel(QObject* parent) :
        QAbstractItemModel(parent),
        m_root(new RootModel)
{
    connect(m_root, SIGNAL(rowsChanged(QList<int>)), this, SLOT(rowsChanged(QList<int>)));
}

Sigmodr::SigmodTreeModel::~SigmodTreeModel()
{
    delete m_root;
}

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

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

QModelIndex Sigmodr::SigmodTreeModel::index(int row, int column, const QModelIndex& parent) const
{
    if ((row < -1) || (column < -1))
        return QModelIndex();
    if (row == -1)
        return createIndex(row, 0, m_root);
    BaseModel* model = getItem(parent);
    if ((model->rowCount() <= row) || (1 <= column))
        return QModelIndex();
    BaseModel* object = model->childItem(row);
    return createIndex(row, 0, object);
}

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

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

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

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

bool Sigmodr::SigmodTreeModel::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(layoutChanged());
    if (success)
    {
        emit(dataChanged(index, index));
        emit(dirty(findSigmod(index), true));
    }
    return success;
}

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

QStringList Sigmodr::SigmodTreeModel::mimeTypes() const
{
    return QStringList() << "application/x-sigmod+xml";
}

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

bool Sigmodr::SigmodTreeModel::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-sigmod+xml"))
        return false;
    if (parent.isValid())
        return setData(parent, data->data("application/x-sigmod+xml"), Sigmodr::BaseModel::XmlRole);
    emit(layoutAboutToBeChanged());
    bool success = m_root->setData(data->data("application/x-sigmod+xml"), Sigmodr::BaseModel::XmlRole);
    emit(layoutChanged());
    if (success)
        emit(dirty(findSigmod(parent), true));
    return success;
}

void Sigmodr::SigmodTreeModel::addSigmod(Sigmod::Sigmod* sigmod)
{
    m_root->addSigmod(sigmod);
    reset();
}

void Sigmodr::SigmodTreeModel::deleteSigmod(const Sigmod::Sigmod* sigmod)
{
    m_root->deleteSigmod(sigmod);
    reset();
}

const Sigmod::Sigmod* Sigmodr::SigmodTreeModel::findSigmod(const QModelIndex& index) const
{
    QModelIndex curIndex = index;
    QModelIndex parIndex = parent(curIndex);
    while (parIndex.isValid())
    {
        curIndex = parIndex;
        parIndex = parent(curIndex);
    }
    return qobject_cast<const Sigmod::Sigmod*>(getItem(curIndex)->object());
}

void Sigmodr::SigmodTreeModel::rowsChanged(const QList<int>& rows)
{
    QModelIndex curIndex;
    foreach (int row, rows)
        curIndex = index(row, 0, curIndex);
    if (curIndex.isValid())
    {
        emit(dataChanged(curIndex, curIndex));
        emit(dirty(findSigmod(curIndex), true));
    }
    else
        reset();
}