/****************************************************************************
**
** 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
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** accordance with the commercial license agreement provided with the
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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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 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_QUERY_H
#define JSONDB_QUERY_H

#include <QDebug>
#include <QObject>
#include <QHash>
#include <QStringList>
#include <QVariant>
#include "jsondberrors.h"

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

#include "jsondbobject.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE_JSONDB_PARTITION

class JsonDbPartition;

class Q_JSONDB_PARTITION_EXPORT JsonDbQueryTerm
{
public:
    JsonDbQueryTerm();
    ~JsonDbQueryTerm();

    QString propertyVariable() const { return mPropertyVariable; }
    void setPropertyVariable(const QString &variable)
    { mPropertyVariable = variable; }

    inline bool hasPropertyName() const { return !mPropertyName.isEmpty(); }
    QString propertyName() const { return mPropertyName; }
    void setPropertyName(const QString &propertyName)
    { mPropertyName = propertyName; mFieldPath = propertyName.split(QLatin1Char('.')); }

    QString op() const { return mOp; }
    void setOp(QString op) { mOp = op; }

    QString joinField() const { return mJoinField; }
    void setJoinField(QString joinField)
    {
        mJoinField = joinField;
        if (!joinField.isEmpty()) {
            QStringList joinFields = joinField.split(QStringLiteral("->"));
            mJoinPaths.resize(joinFields.size());
            for (int j = 0; j < joinFields.size(); j++)
                mJoinPaths[j] = joinFields[j].split(QLatin1Char('.'));
        }
    }
    const QVector<QStringList> &joinPaths() const { return mJoinPaths; }

    QString variable() const { return mVariable; }
    void setVariable(const QString variable) { mVariable = variable; }

    inline bool hasValue() const { return !mValue.isUndefined(); }
    QJsonValue value() const;
    void setValue(const QJsonValue &v) { mValue = v; }

    QRegExp &regExp() { return mRegExp; }
    void setRegExp(const QRegExp &regExp) { mRegExp = regExp; }
    const QRegExp &regExpConst() const { return mRegExp; }

 private:
    QString mPropertyVariable;
    QString mPropertyName;
    QString mVariable;
    QJsonValue mValue;
    QRegExp mRegExp;
    QStringList mFieldPath;
    QString mOp;
    QString mJoinField;
    QVector<QStringList> mJoinPaths;
};

class Q_JSONDB_PARTITION_EXPORT JsonDbOrQueryTerm
{
public:
    JsonDbOrQueryTerm();
    JsonDbOrQueryTerm(const JsonDbQueryTerm &term);
    ~JsonDbOrQueryTerm();

    const QList<JsonDbQueryTerm> &terms() const { return mTerms; }
    void addTerm(const JsonDbQueryTerm &term) { mTerms.append(term); }
    QList<QString> propertyNames() const;
    QList<QString> findUnindexablePropertyNames() const;
private:
    QList<JsonDbQueryTerm> mTerms;
};

class Q_JSONDB_PARTITION_EXPORT JsonDbOrderTerm
{
public:
    JsonDbOrderTerm() : ascending(false) { }
    ~JsonDbOrderTerm() { }

    bool ascending;
    QString propertyName;
};

class Q_JSONDB_PARTITION_EXPORT JsonDbQuery
{
public:
    JsonDbQuery();
    ~JsonDbQuery();

    QList<JsonDbOrQueryTerm> queryTerms;
    QList<JsonDbOrderTerm> orderTerms;
    QString query;
    QStringList mapExpressionList;
    QStringList mapKeyList;
    QString aggregateOperation;

    QMap<QString,QJsonValue> bindings;

    inline bool isEmpty() const { return queryTerms.isEmpty() && orderTerms.isEmpty(); }

    QSet<QString> matchedTypes() const { return mMatchedTypes; }
    bool match(const JsonDbObject &object, QHash<QString, JsonDbObject> *objectCache, JsonDbPartition *partition = 0) const;

    inline QJsonValue termValue(const JsonDbQueryTerm &term) const
    { return term.hasValue() ? term.value() : bindings.value(term.variable(), QJsonValue(QJsonValue::Undefined)); }

    bool isAscending() const;

private:
    QSet<QString> mMatchedTypes;
    friend class JsonDbQueryParserPrivate;
};

QT_END_NAMESPACE_JSONDB_PARTITION

QT_END_HEADER

#endif // JSONDB_QUERY_H