/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtAddOn.JsonDb module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** 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 and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
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****************************************************************************/

#ifndef JSONDB_VIEW_H
#define JSONDB_VIEW_H

#include <QObject>
#include <QString>

#include "jsondbpartitionglobal.h"
#include "jsondbmapdefinition.h"
#include "jsondbreducedefinition.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE_JSONDB_PARTITION

class JsonDbOwner;
class JsonDbPartition;
class JsonDbObjectTable;

class Q_JSONDB_PARTITION_EXPORT JsonDbView : public QObject
{
    Q_OBJECT
public:
    JsonDbView(JsonDbPartition *partition, const QString &viewType,
               QObject *parent = 0);
    ~JsonDbView();
    JsonDbPartition *partition() const { return mPartition; }
    JsonDbObjectTable *objectTable() const { return mViewObjectTable; }
    QStringList sourceTypes() const { return mSourceTypes; }
    QSet<QString> sourceTypeSet() const { return QSet<QString>::fromList(mSourceTypes); }

    void open();
    void close();

    static void initViews(JsonDbPartition *partition);
    static void createDefinition(JsonDbPartition *partition, QJsonObject definition);
    static void removeDefinition(JsonDbPartition *partition, QJsonObject definition);

    void updateView(quint32 stateNumber=0, JsonDbUpdateList *resultingChanges=0);
    void updateEagerView(const JsonDbUpdateList &objectsUpdated, JsonDbUpdateList *resultingChanges);
    void updateViewStateNumber(quint32 partitionStateNumber);
    void reduceMemoryUsage();
    void closeIndexes();

    bool isActive() const;

Q_SIGNALS:
    void updated(const QString &type);

private:
    void createMapDefinition(QJsonObject mapDefinition);
    void removeMapDefinition(QJsonObject mapDefinition);
    void createReduceDefinition(QJsonObject reduceDefinition);
    void removeReduceDefinition(QJsonObject reduceDefinition);
    bool processUpdatedDefinitions(const QString &viewType, quint32 targetStateNumber,
                                   QSet<QString> &processedDefinitions);
    void updateSourceTypesList();
    bool viewDefinitionUpdated(const JsonDbUpdateList &objectsUpdated) const;
    void updateViewOnChanges(const JsonDbUpdateList &objectsUpdated, QSet<QString> &processedDefinitionUuids, JsonDbUpdateList *changeList);

private:
    JsonDbPartition *mPartition;
    JsonDbObjectTable   *mViewObjectTable;     // view object table
    JsonDbObjectTable   *mMainObjectTable; // partition's main object table
    quint32        mViewStateNumber;
    QString        mViewType;
    QStringList    mSourceTypes;
    typedef QMap<JsonDbObjectTable*,QSet<QString> > ObjectTableSourceTypeMap;
    ObjectTableSourceTypeMap              mObjectTableSourceTypeMap;
    QMap<QString,JsonDbMapDefinition*>    mMapDefinitions;         // maps uuid to view definition
    QMap<QString,JsonDbMapDefinition*>    mMapDefinitionsBySource; // maps map source type to view definition
    QMap<QString,JsonDbReduceDefinition*> mReduceDefinitions;      // maps uuid to view definition
    QMap<QString,JsonDbReduceDefinition*> mReduceDefinitionsBySource; // maps reduce source type to view definition
    bool mUpdating;

    friend class JsonDbMapDefinition;
    friend class JsonDbReduceDefinition;
};

QT_END_NAMESPACE_JSONDB_PARTITION

QT_END_HEADER

#endif // JSONDB_VIEW_H