/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#ifndef QDECLARATIVECHANGESET_P_H
#define QDECLARATIVECHANGESET_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qdebug.h>
#include <QtCore/qvector.h>

QT_BEGIN_NAMESPACE

class Q_AUTOTEST_EXPORT QDeclarativeChangeSet
{
public:
    struct Insert
    {
        Insert() {}
        Insert(int start, int end) : start(start), end(end) {}

        int count() const { return end - start; }

        int start;
        int end;
    };

    struct Remove
    {
        Remove() {}
        Remove(int start, int end) : start(start), end(end) {}

        int count() const { return end - start; }

        int start;
        int end;
    };

    struct Move
    {
        Move() {}
        Move(int start, int end, int to) : fstart(start), fend(end), tstart(to), tend(to + end - start) {}

        int minimum() const { return qMin(fstart, tstart); }
        int maximum() const { return qMax(fend, tend); }
        int count() const { return fend - fstart; }

        union {
            int start;
            int fstart;
        };
        union {
            int end;
            int fend;
        };
        union {
            int to;
            int tstart;
        };
        int tend;
    };

    struct Change
    {
        Change() {}
        Change(int start, int end) : start(start), end(end) {}

        int count() const { return end - start; }

        int start;
        int end;
    };

    const QVector<Remove> &removes() const { return m_removes; }
    const QVector<Insert> &inserts() const { return m_inserts; }
    const QVector<Move> &moves() const { return m_moves; }
    const QVector<Change> &changes() const {return  m_changes; }

    void insertInsert(int start, int end);
    void insertRemove(int start, int end);
    void insertMove(int start, int end, int to);
    void insertChange(int start, int end);

    void appendInsert(int start, int end) { m_inserts.append(Insert(start, end)); }
    void appendRemove(int start, int end) { m_removes.append(Remove(start, end)); }
    void appendMove(int start, int end, int to) { m_moves.append(Move(start, end, to)); }
    void appendChange(int start, int end) { m_changes.append(Change(start, end)); }

    void append(const QVector<Insert> &inserts) { m_inserts += inserts; }
    void append(const QVector<Remove> &removes) { m_removes += removes; }
    void append(const QVector<Move> &moves) { m_moves += moves; }
    void append(const QVector<Change> &changes) { m_changes += changes; }

    void clear()
    {
        m_removes.clear();
        m_inserts.clear();
        m_moves.clear();
        m_changes.clear();
    }

private:
    QVector<Remove> m_removes;
    QVector<Insert> m_inserts;
    QVector<Move> m_moves;
    QVector<Change> m_changes;
};

Q_AUTOTEST_EXPORT QDebug operator <<(QDebug debug, const QDeclarativeChangeSet &change);

QT_END_NAMESPACE

#endif