/****************************************************************************
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtAddOn.JsonDb module of the Qt Toolkit.
**
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** 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
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** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** 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
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****************************************************************************/

#ifndef JSONDB_REDUCE_DEFINITION_H
#define JSONDB_REDUCE_DEFINITION_H

#include <QJSEngine>
#include <QStringList>

#include "jsondbpartitionglobal.h"
#include <qjsonarray.h>
#include <qjsonobject.h>
#include <qjsonvalue.h>

#include <jsondbobject.h>
#include <jsondbpartition.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE_JSONDB_PARTITION

class JsonDbOwner;
class JsonDbJoinProxy;
class JsonDbMapProxy;
class JsonDbPartition;
class JsonDbObjectTable;

class JsonDbReduceDefinition : public QObject
{
    Q_OBJECT
public:
    JsonDbReduceDefinition(const JsonDbOwner *mOwner, JsonDbPartition *partition, QJsonObject reduceDefinition, QObject *parent = 0);
    QString uuid() const { return mUuid; }
    QString targetType() const { return mTargetType; }
    QString sourceType() const { return mSourceType; }
    QString sourceKeyName() const { return mSourceKeyName; }
    QString targetKeyName() const { return mTargetKeyName; }
    QString targetValueName() const { return mTargetValueName; }
    // sourceKeyName split on .
    QStringList sourceKeyNameList() const { return mSourceKeyNameList; }
    bool isActive() const;
    QJsonObject definition() const { return mDefinition; }
    const JsonDbOwner *owner() const { return mOwner; }

    static void definitionRemoved(JsonDbPartition *partition, JsonDbObjectTable *table, const QString targetType, const QString &definitionUuid);
    void definitionCreated();

    void initIndexes();

    void updateObject(JsonDbObject before, JsonDbObject after, JsonDbUpdateList *changeList = 0);

    void setError(const QString &errorMsg);

    static bool validateDefinition(const JsonDbObject &reduce, JsonDbPartition *partition, QString &message);

public slots:
    void initScriptEngine();
    void releaseScriptEngine();

private:
    enum FunctionNumber {
        Add = 0,
        Subtract = 1,
        SourceKeyValue = 2
    };
    static bool compileFunctions(QJSEngine *scriptEngine, QJsonObject definition, JsonDbJoinProxy *joinProxy, QVector<QJSValue> &mFunctions, QString &message);
    QJsonValue sourceKeyValue(const JsonDbObject &object);
    QJsonValue addObject(FunctionNumber fn, const QJsonValue &keyValue, QJsonValue previousResult, JsonDbObject object);

private:
    const JsonDbOwner *mOwner;
    JsonDbPartition *mPartition;
    QJsonObject    mDefinition;
    QPointer<QJSEngine> mScriptEngine;
    QVector<QJSValue> mFunctions;
    QString        mUuid;
    QString        mTargetType;
    JsonDbObjectTable   *mTargetTable;
    QString        mSourceType;
    QString        mTargetKeyName;
    QString        mTargetValueName;
    QString        mSourceKeyName;
    // mSourceKeyName split on .
    QStringList    mSourceKeyNameList;
};

QT_END_NAMESPACE_JSONDB_PARTITION

QT_END_HEADER

#endif // JSONDB_REDUCE_DEFINITION_H