/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/

#include "buildconfigurationmodel.h"
#include "target.h"
#include "buildconfiguration.h"

using namespace ProjectExplorer;

/*!
    \class ProjectExplorer::BuildConfigurationModel
    \brief A model to represent the build configurations of a target.

    To be used in for the drop down of comboboxes.
    Does automatically adjust itself to added and removed BuildConfigurations
    Very similar to the Run Configuration Model.
    TODO might it possible to share code without making the code a complete mess.
*/

class BuildConfigurationComparer
{
public:
    bool operator()(BuildConfiguration *a, BuildConfiguration *b)
    {
        return a->displayName() < b->displayName();
    }
};

BuildConfigurationModel::BuildConfigurationModel(Target *target, QObject *parent)
    : QAbstractListModel(parent),
      m_target(target)
{
    m_buildConfigurations = m_target->buildConfigurations();
    qSort(m_buildConfigurations.begin(), m_buildConfigurations.end(), BuildConfigurationComparer());

    connect(target, SIGNAL(addedBuildConfiguration(ProjectExplorer::BuildConfiguration*)),
            this, SLOT(addedBuildConfiguration(ProjectExplorer::BuildConfiguration*)));
    connect(target, SIGNAL(removedBuildConfiguration(ProjectExplorer::BuildConfiguration*)),
            this, SLOT(removedBuildConfiguration(ProjectExplorer::BuildConfiguration*)));

    foreach (BuildConfiguration *bc, m_buildConfigurations)
        connect(bc, SIGNAL(displayNameChanged()),
                this, SLOT(displayNameChanged()));
}

int BuildConfigurationModel::rowCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : m_buildConfigurations.size();
}

int BuildConfigurationModel::columnCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : 1;
}

void BuildConfigurationModel::displayNameChanged()
{
    BuildConfiguration *rc = qobject_cast<BuildConfiguration *>(sender());
    if (!rc)
        return;

    BuildConfigurationComparer compare;
    // Find the old position
    int oldPos = m_buildConfigurations.indexOf(rc);

    if (oldPos >= 1 && compare(m_buildConfigurations.at(oldPos), m_buildConfigurations.at(oldPos - 1))) {
        // We need to move up
        int newPos = oldPos - 1;
        while (newPos >= 0 && compare(m_buildConfigurations.at(oldPos), m_buildConfigurations.at(newPos))) {
            --newPos;
        }
        ++newPos;

        beginMoveRows(QModelIndex(), oldPos, oldPos, QModelIndex(), newPos);
        m_buildConfigurations.insert(newPos, rc);
        m_buildConfigurations.removeAt(oldPos + 1);
        endMoveRows();
        // Not only did we move, we also changed...
        emit dataChanged(index(newPos, 0), index(newPos,0));
    } else if  (oldPos < m_buildConfigurations.size() - 1
                && compare(m_buildConfigurations.at(oldPos + 1), m_buildConfigurations.at(oldPos))) {
        // We need to move down
        int newPos = oldPos + 1;
        while (newPos < m_buildConfigurations.size()
            && compare(m_buildConfigurations.at(newPos), m_buildConfigurations.at(oldPos))) {
            ++newPos;
        }
        beginMoveRows(QModelIndex(), oldPos, oldPos, QModelIndex(), newPos);
        m_buildConfigurations.insert(newPos, rc);
        m_buildConfigurations.removeAt(oldPos);
        endMoveRows();

        // We need to subtract one since removing at the old place moves the newIndex down
        emit dataChanged(index(newPos - 1, 0), index(newPos - 1, 0));
    } else {
        emit dataChanged(index(oldPos, 0), index(oldPos, 0));
    }
}

QVariant BuildConfigurationModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::DisplayRole) {
        const int row = index.row();
        if (row < m_buildConfigurations.size()) {
            return m_buildConfigurations.at(row)->displayName();
        }
    }

    return QVariant();
}

BuildConfiguration *BuildConfigurationModel::buildConfigurationAt(int i)
{
    if (i > m_buildConfigurations.size() || i < 0)
        return 0;
    return m_buildConfigurations.at(i);
}

BuildConfiguration *BuildConfigurationModel::buildConfigurationFor(const QModelIndex &idx)
{
    if (idx.row() > m_buildConfigurations.size() || idx.row() < 0)
        return 0;
    return m_buildConfigurations.at(idx.row());
}

QModelIndex BuildConfigurationModel::indexFor(BuildConfiguration *rc)
{
    int idx = m_buildConfigurations.indexOf(rc);
    if (idx == -1)
        return QModelIndex();
    return index(idx, 0);
}

void BuildConfigurationModel::addedBuildConfiguration(ProjectExplorer::BuildConfiguration *bc)
{
    // Find the right place to insert
    BuildConfigurationComparer compare;
    int i = 0;
    for (; i < m_buildConfigurations.size(); ++i) {
        if (compare(bc, m_buildConfigurations.at(i))) {
            break;
        }
    }

    beginInsertRows(QModelIndex(), i, i);
    m_buildConfigurations.insert(i, bc);
    endInsertRows();


    connect(bc, SIGNAL(displayNameChanged()),
            this, SLOT(displayNameChanged()));
}

void BuildConfigurationModel::removedBuildConfiguration(ProjectExplorer::BuildConfiguration *bc)
{
    int i = m_buildConfigurations.indexOf(bc);
    beginRemoveRows(QModelIndex(), i, i);
    m_buildConfigurations.removeAt(i);
    endRemoveRows();
}