/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
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**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
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#ifndef ENVIRONMENTEDITMODEL_H
#define ENVIRONMENTEDITMODEL_H

#include "environment.h"

#include <QtCore/QString>
#include <QtCore/QAbstractItemModel>
#include <QtGui/QWidget>

QT_BEGIN_NAMESPACE
class QTreeView;
class QPushButton;
QT_END_NAMESPACE

namespace Utils {
class DetailsWidget;
}

namespace ProjectExplorer {

class EnvironmentModel : public QAbstractItemModel
{
    Q_OBJECT
public:
    EnvironmentModel();
    ~EnvironmentModel();
    void setBaseEnvironment(const ProjectExplorer::Environment &env);
    int rowCount(const QModelIndex &parent) const;
    int columnCount(const QModelIndex &parent) const;

    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
    Qt::ItemFlags flags(const QModelIndex &index) const;
    bool hasChildren(const QModelIndex &index) const;
    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;
    QModelIndex parent(const QModelIndex &index) const;
    QModelIndex addVariable();
    QModelIndex addVariable(const EnvironmentItem& item);
    void removeVariable(const QString &name);
    void unset(const QString &name);
    bool isUnset(const QString &name);
    bool isInBaseEnvironment(const QString &name);
    QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
    QString indexToVariable(const QModelIndex &index) const;
    QModelIndex index(const QString &name);
    bool changes(const QString &key) const;
    QList<EnvironmentItem> userChanges() const;
    void setUserChanges(QList<EnvironmentItem> list);

signals:
    void userChangesChanged();
    /// Strictly speaking this is a hack to work around
    /// the problem that we don't emit the right signals
    /// on editing a variable
    /// Don't try to fix that with out consulting me
    /// In short it's impossible to emit the right signals
    /// and to ensure that the model is in a consistent
    /// state at each signal emission
    void renamedVariable(const QString &newName);
private:
    void updateResultEnvironment();
    int findInChanges(const QString &name) const;
    int findInChangesInsertPosition(const QString &name) const;
    int findInResultInsertPosition(const QString &name) const;
    int findInResult(const QString &name) const;

    ProjectExplorer::Environment m_baseEnvironment;
    ProjectExplorer::Environment m_resultEnvironment;
    QList<EnvironmentItem> m_items;
};

class PROJECTEXPLORER_EXPORT EnvironmentWidget : public QWidget
{
    Q_OBJECT
public:
    EnvironmentWidget(QWidget *parent, QWidget *additionalDetailsWidget = 0);
    ~EnvironmentWidget();

    void setBaseEnvironmentText(const QString &text);
    void setBaseEnvironment(const ProjectExplorer::Environment &env);

    QList<EnvironmentItem> userChanges() const;
    void setUserChanges(QList<EnvironmentItem> list);

public slots:
    void updateButtons();

signals:
    void userChangesChanged();
    void detailsVisibleChanged(bool visible);

private slots:
    void editEnvironmentButtonClicked();
    void addEnvironmentButtonClicked();
    void removeEnvironmentButtonClicked();
    void unsetEnvironmentButtonClicked();
    void environmentCurrentIndexChanged(const QModelIndex &current, const QModelIndex &previous);
    void updateSummaryText();
    void renamedVariable(const QString &name);

private:
    EnvironmentModel *m_model;
    QString m_baseEnvironmentText;
    Utils::DetailsWidget *m_detailsContainer;
    QTreeView *m_environmentTreeView;
    QPushButton *m_editButton;
    QPushButton *m_addButton;
    QPushButton *m_removeButton;
    QPushButton *m_unsetButton;
};

} // namespace ProjectExplorer

#endif // ENVIRONMENTEDITMODEL_H