/****************************************************************************
**
** Copyright (C) 2012 Jeremy Lainé <jeremy.laine@m4x.org>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtNetwork 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QDNSLOOKUP_P_H
#define QDNSLOOKUP_P_H

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

#include <QtNetwork/private/qtnetworkglobal_p.h>
#include "QtCore/qmutex.h"
#include "QtCore/qrunnable.h"
#include "QtCore/qsharedpointer.h"
#include "QtCore/qthreadpool.h"
#include "QtNetwork/qdnslookup.h"
#include "QtNetwork/qhostaddress.h"
#include "private/qobject_p.h"

QT_REQUIRE_CONFIG(dnslookup);

QT_BEGIN_NAMESPACE

//#define QDNSLOOKUP_DEBUG

class QDnsLookupRunnable;

class QDnsLookupReply
{
public:
    QDnsLookupReply()
        : error(QDnsLookup::NoError)
    { }

    QDnsLookup::Error error;
    QString errorString;

    QList<QDnsDomainNameRecord> canonicalNameRecords;
    QList<QDnsHostAddressRecord> hostAddressRecords;
    QList<QDnsMailExchangeRecord> mailExchangeRecords;
    QList<QDnsDomainNameRecord> nameServerRecords;
    QList<QDnsDomainNameRecord> pointerRecords;
    QList<QDnsServiceRecord> serviceRecords;
    QList<QDnsTextRecord> textRecords;
};

class QDnsLookupPrivate : public QObjectPrivate
{
public:
    QDnsLookupPrivate()
        : isFinished(false)
        , type(QDnsLookup::A)
        , runnable(0)
    { }

    void _q_lookupFinished(const QDnsLookupReply &reply);

    static const char *msgNoIpV6NameServerAdresses;

    bool isFinished;
    QString name;
    QDnsLookup::Type type;
    QHostAddress nameserver;
    QDnsLookupReply reply;
    QDnsLookupRunnable *runnable;

    Q_DECLARE_PUBLIC(QDnsLookup)
};

class QDnsLookupRunnable : public QObject, public QRunnable
{
    Q_OBJECT

public:
    QDnsLookupRunnable(QDnsLookup::Type type, const QByteArray &name, const QHostAddress &nameserver)
        : requestType(type)
        , requestName(name)
        , nameserver(nameserver)
    { }
    void run() override;

signals:
    void finished(const QDnsLookupReply &reply);

private:
    static void query(const int requestType, const QByteArray &requestName, const QHostAddress &nameserver, QDnsLookupReply *reply);
    QDnsLookup::Type requestType;
    QByteArray requestName;
    QHostAddress nameserver;
};

class QDnsLookupThreadPool : public QThreadPool
{
    Q_OBJECT

public:
    QDnsLookupThreadPool();
    void start(QRunnable *runnable);

private slots:
    void _q_applicationDestroyed();

private:
    QMutex signalsMutex;
    bool signalsConnected;
};

class QDnsRecordPrivate : public QSharedData
{
public:
    QDnsRecordPrivate()
        : timeToLive(0)
    { }

    QString name;
    quint32 timeToLive;
};

class QDnsDomainNameRecordPrivate : public QDnsRecordPrivate
{
public:
    QDnsDomainNameRecordPrivate()
    { }

    QString value;
};

class QDnsHostAddressRecordPrivate : public QDnsRecordPrivate
{
public:
    QDnsHostAddressRecordPrivate()
    { }

    QHostAddress value;
};

class QDnsMailExchangeRecordPrivate : public QDnsRecordPrivate
{
public:
    QDnsMailExchangeRecordPrivate()
        : preference(0)
    { }

    QString exchange;
    quint16 preference;
};

class QDnsServiceRecordPrivate : public QDnsRecordPrivate
{
public:
    QDnsServiceRecordPrivate()
        : port(0),
          priority(0),
          weight(0)
    { }

    QString target;
    quint16 port;
    quint16 priority;
    quint16 weight;
};

class QDnsTextRecordPrivate : public QDnsRecordPrivate
{
public:
    QDnsTextRecordPrivate()
    { }

    QList<QByteArray> values;
};

QT_END_NAMESPACE

Q_DECLARE_METATYPE(QDnsLookupReply)

#endif // QDNSLOOKUP_P_H
