/***************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact:  Qt Software Information (qt-info@nokia.com)
**
**
** Non-Open Source Usage
**
** Licensees may use this file in accordance with the Qt Beta Version
** License Agreement, Agreement version 2.2 provided with the Software or,
** alternatively, in accordance with the terms contained in a written
** agreement between you and Nokia.
**
** GNU General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the packaging
** of this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
**
** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
** http://www.gnu.org/copyleft/gpl.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt GPL Exception
** version 1.3, included in the file GPL_EXCEPTION.txt in this package.
**
***************************************************************************/

#include "undocommands_p.h"

#include <QtCore/QModelIndex>

namespace SharedTools {

ViewCommand::ViewCommand(ResourceView *view)
        : m_view(view)
{ }

ViewCommand::~ViewCommand()
{ }

ModelIndexViewCommand::ModelIndexViewCommand(ResourceView *view)
        : ViewCommand(view)
{ }

ModelIndexViewCommand::~ModelIndexViewCommand()
{ }

void ModelIndexViewCommand::storeIndex(const QModelIndex &index)
{
    if (m_view->isPrefix(index)) {
        m_prefixArrayIndex = index.row();
        m_fileArrayIndex = -1;
    } else {
        m_fileArrayIndex = index.row();
        m_prefixArrayIndex = m_view->model()->parent(index).row();
    }
}

QModelIndex ModelIndexViewCommand::makeIndex() const
{
    const QModelIndex prefixModelIndex
            = m_view->model()->index(m_prefixArrayIndex, 0, QModelIndex());
    if (m_fileArrayIndex != -1) {
        // File node
        const QModelIndex fileModelIndex
                = m_view->model()->index(m_fileArrayIndex, 0, prefixModelIndex);
        return fileModelIndex;
    } else {
        // Prefix node
        return prefixModelIndex;
    }
}



ModifyPropertyCommand::ModifyPropertyCommand(ResourceView *view, const QModelIndex &nodeIndex,
        ResourceView::NodeProperty property, const int mergeId, const QString &before,
        const QString &after)
        : ModelIndexViewCommand(view), m_property(property), m_before(before), m_after(after),
        m_mergeId(mergeId)
{
    storeIndex(nodeIndex);
}

bool ModifyPropertyCommand::mergeWith(const QUndoCommand * command)
{
    const ModifyPropertyCommand * const brother
            = dynamic_cast<const ModifyPropertyCommand *>(command);
    if (command == 0 || m_property != brother->m_property)
        return false;

    // Choose older command (this) and forgot the other
    return true;
}

void ModifyPropertyCommand::undo()
{
    QTC_ASSERT(m_view, return);

    // Save current text in m_after for redo()
    m_after = m_view->getCurrentValue(m_property);

    // Reset text to m_before
    m_view->changeValue(makeIndex(), m_property, m_before);
}

void ModifyPropertyCommand::redo()
{
    // Prevent execution from within QUndoStack::push
    if (m_after.isNull())
        return;

    // Bring back text before undo
    QTC_ASSERT(m_view, return);
    m_view->changeValue(makeIndex(), m_property, m_after);
}

RemoveEntryCommand::RemoveEntryCommand(ResourceView *view, const QModelIndex &index)
        : ModelIndexViewCommand(view), m_entry(0), m_isExpanded(true)
{
    storeIndex(index);
}

RemoveEntryCommand::~RemoveEntryCommand()
{
    freeEntry();
}

void RemoveEntryCommand::redo()
{
    freeEntry();
    const QModelIndex index = makeIndex();
    m_isExpanded = m_view->isExpanded(index);
    m_entry = m_view->removeEntry(index);
}

void RemoveEntryCommand::undo()
{
    if (m_entry == 0) {
        m_entry->restore();
        QTC_ASSERT(m_view != 0, return);
        const QModelIndex index = makeIndex();
        m_view->setExpanded(index, m_isExpanded);
        m_view->setCurrentIndex(index);
        freeEntry();
    }
}

void RemoveEntryCommand::freeEntry()
{
    delete m_entry;
    m_entry = 0;
}

AddFilesCommand::AddFilesCommand(ResourceView *view, int prefixIndex, int cursorFileIndex,
        const QStringList &fileNames)
        : ViewCommand(view), m_prefixIndex(prefixIndex), m_cursorFileIndex(cursorFileIndex),
        m_fileNames(fileNames)
{ }

void AddFilesCommand::redo()
{
    m_view->addFiles(m_prefixIndex, m_fileNames, m_cursorFileIndex, m_firstFile, m_lastFile);
}

void AddFilesCommand::undo()
{
    m_view->removeFiles(m_prefixIndex, m_firstFile, m_lastFile);
}

AddEmptyPrefixCommand::AddEmptyPrefixCommand(ResourceView *view)
        : ViewCommand(view)
{ }

void AddEmptyPrefixCommand::redo()
{
    m_prefixArrayIndex = m_view->addPrefix().row();
}

void AddEmptyPrefixCommand::undo()
{
    const QModelIndex prefixModelIndex = m_view->model()->index(
            m_prefixArrayIndex, 0, QModelIndex());
    delete m_view->removeEntry(prefixModelIndex);
}

} // namespace SharedTools