/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtDeclarative module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** 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, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "private/qdeclarativedebugservice_p.h"

#include "private/qpacketprotocol_p.h"

#include <QtCore/qdebug.h>

#include <QtNetwork/qtcpserver.h>

#include <QtNetwork/qtcpsocket.h>

#include <QtCore/qstringlist.h>

#include <private/qobject_p.h>

QT_BEGIN_NAMESPACE

class QDeclarativeDebugServerPrivate;

class QDeclarativeDebugServer : public QObject

{

    Q_OBJECT

    Q_DECLARE_PRIVATE(QDeclarativeDebugServer)

    Q_DISABLE_COPY(QDeclarativeDebugServer)

public:

    static QDeclarativeDebugServer *instance();

    void listen();

    bool hasDebuggingClient() const;

private Q_SLOTS:

    void readyRead();

    void newConnection();

private:

    friend class QDeclarativeDebugService;

    friend class QDeclarativeDebugServicePrivate;

    QDeclarativeDebugServer(int); 

};

class QDeclarativeDebugServerPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QDeclarativeDebugServer)

public:

    QDeclarativeDebugServerPrivate();

    int port;

    QTcpSocket *connection;

    QPacketProtocol *protocol;

    QHash<QString, QDeclarativeDebugService *> plugins;

    QStringList enabledPlugins;

    QTcpServer *tcpServer;

    bool gotHello;

};

class QDeclarativeDebugServicePrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QDeclarativeDebugService)

public:

    QDeclarativeDebugServicePrivate();

    QString name;

    QDeclarativeDebugServer *server;

};

QDeclarativeDebugServerPrivate::QDeclarativeDebugServerPrivate()

: connection(0), protocol(0), gotHello(false)

{

}

void QDeclarativeDebugServer::listen()

{

    Q_D(QDeclarativeDebugServer);

    d->tcpServer = new QTcpServer(this);

    QObject::connect(d->tcpServer, SIGNAL(newConnection()), this, SLOT(newConnection()));

    if (d->tcpServer->listen(QHostAddress::Any, d->port)) 

        qWarning("QDeclarativeDebugServer: Waiting for connection on port %d...", d->port);

    else

        qWarning("QDeclarativeDebugServer: Unable to listen on port %d", d->port);

}

void QDeclarativeDebugServer::newConnection()

{

    Q_D(QDeclarativeDebugServer);

    if (d->connection) {

        qWarning("QDeclarativeDebugServer error: another client is already connected");

        return;

    }

    d->connection = d->tcpServer->nextPendingConnection();

    d->connection->setParent(this);

    d->protocol = new QPacketProtocol(d->connection, this);

    QObject::connect(d->protocol, SIGNAL(readyRead()), this, SLOT(readyRead()));

}

bool QDeclarativeDebugServer::hasDebuggingClient() const

{

    Q_D(const QDeclarativeDebugServer);

    return d->gotHello;

}

QDeclarativeDebugServer *QDeclarativeDebugServer::instance()

{

    static bool envTested = false;

    static QDeclarativeDebugServer *server = 0;

    if (!envTested) {

        envTested = true;

        QByteArray env = qgetenv("QML_DEBUG_SERVER_PORT");

        bool ok = false;

        int port = env.toInt(&ok);

        if (ok && port > 1024) {

            server = new QDeclarativeDebugServer(port);

            server->listen();

        }

    }

    return server;

}

QDeclarativeDebugServer::QDeclarativeDebugServer(int port)

: QObject(*(new QDeclarativeDebugServerPrivate))

{

    Q_D(QDeclarativeDebugServer);

    d->port = port;

}

void QDeclarativeDebugServer::readyRead()

{

    Q_D(QDeclarativeDebugServer);

    if (!d->gotHello) {

        QPacket hello = d->protocol->read();

        QString name; 

        hello >> name >> d->enabledPlugins;

        if (name != QLatin1String("QDeclarativeDebugServer")) {

            qWarning("QDeclarativeDebugServer: Invalid hello message");

            QObject::disconnect(d->protocol, SIGNAL(readyRead()), this, SLOT(readyRead()));

            d->protocol->deleteLater();

            d->protocol = 0;

            d->connection->deleteLater();

            d->connection = 0;

            return;

        }

        d->gotHello = true;

        qWarning("QDeclarativeDebugServer: Connection established");

    }

    QString debugServer(QLatin1String("QDeclarativeDebugServer"));

    while (d->protocol->packetsAvailable()) {

        QPacket pack = d->protocol->read();

        QString name;

        pack >> name;

        if (name == debugServer) {

            int op = -1; QString plugin;

            pack >> op >> plugin;

            if (op == 1) {

                // Enable

                if (!d->enabledPlugins.contains(plugin)) {

                    d->enabledPlugins.append(plugin);

                    QHash<QString, QDeclarativeDebugService *>::Iterator iter = 

                        d->plugins.find(plugin);

                    if (iter != d->plugins.end())

                        (*iter)->enabledChanged(true);

                }

            } else if (op == 2) {

                // Disable

                if (d->enabledPlugins.contains(plugin)) {

                    d->enabledPlugins.removeAll(plugin);

                    QHash<QString, QDeclarativeDebugService *>::Iterator iter = 

                        d->plugins.find(plugin);

                    if (iter != d->plugins.end())

                        (*iter)->enabledChanged(false);

                }

            } else {

                qWarning("QDeclarativeDebugServer: Invalid control message %d", op);

            }

        } else {

            QByteArray message;

            pack >> message;

            QHash<QString, QDeclarativeDebugService *>::Iterator iter = 

                d->plugins.find(name);

            if (iter == d->plugins.end()) {

                qWarning() << "QDeclarativeDebugServer: Message received for missing plugin" << name;

            } else {

                (*iter)->messageReceived(message);

            }

        }

    }

}

QDeclarativeDebugServicePrivate::QDeclarativeDebugServicePrivate()

: server(0)

{

}

QDeclarativeDebugService::QDeclarativeDebugService(const QString &name, QObject *parent)

: QObject(*(new QDeclarativeDebugServicePrivate), parent)

{

    Q_D(QDeclarativeDebugService);

    d->name = name;

    d->server = QDeclarativeDebugServer::instance();

    if (!d->server)

        return;

    if (d->server->d_func()->plugins.contains(name)) {

        qWarning() << "QDeclarativeDebugService: Conflicting plugin name" << name;

        d->server = 0;

    } else {

        d->server->d_func()->plugins.insert(name, this);

    }

}

QString QDeclarativeDebugService::name() const

{

    Q_D(const QDeclarativeDebugService);

    return d->name;

}

bool QDeclarativeDebugService::isEnabled() const

{

    Q_D(const QDeclarativeDebugService);

    return (d->server && d->server->d_func()->enabledPlugins.contains(d->name));

}

namespace {

    struct ObjectReference 

    {

        QPointer<QObject> object;

        int id;

    };

    struct ObjectReferenceHash 

    {

        ObjectReferenceHash() : nextId(0) {}

        QHash<QObject *, ObjectReference> objects;

        QHash<int, QObject *> ids;

        int nextId;

    };

}

Q_GLOBAL_STATIC(ObjectReferenceHash, objectReferenceHash);

/*!

    Returns a unique id for \a object.  Calling this method multiple times

    for the same object will return the same id.

*/

int QDeclarativeDebugService::idForObject(QObject *object)

{

    if (!object)

        return -1;

    ObjectReferenceHash *hash = objectReferenceHash();

    QHash<QObject *, ObjectReference>::Iterator iter = 

        hash->objects.find(object);

    if (iter == hash->objects.end()) {

        int id = hash->nextId++;

        hash->ids.insert(id, object);

        iter = hash->objects.insert(object, ObjectReference());

        iter->object = object;

        iter->id = id;

    } else if (iter->object != object) {

        int id = hash->nextId++;

        hash->ids.remove(iter->id);

        hash->ids.insert(id, object);

        iter->object = object;

        iter->id = id;

    } 

    return iter->id;

}

/*!

    Returns the object for unique \a id.  If the object has not previously been

    assigned an id, through idForObject(), then 0 is returned.  If the object

    has been destroyed, 0 is returned.

*/

QObject *QDeclarativeDebugService::objectForId(int id)

{

    ObjectReferenceHash *hash = objectReferenceHash();

    QHash<int, QObject *>::Iterator iter = hash->ids.find(id);

    if (iter == hash->ids.end())

        return 0;

    QHash<QObject *, ObjectReference>::Iterator objIter = 

        hash->objects.find(*iter);

    Q_ASSERT(objIter != hash->objects.end());

    if (objIter->object == 0) {

        hash->ids.erase(iter);

        hash->objects.erase(objIter);

        return 0;

    } else {

        return *iter;

    }

}

bool QDeclarativeDebugService::isDebuggingEnabled()

{

    return QDeclarativeDebugServer::instance() != 0;

}

bool QDeclarativeDebugService::hasDebuggingClient()

{

    return QDeclarativeDebugServer::instance() != 0

            && QDeclarativeDebugServer::instance()->hasDebuggingClient();

}

QString QDeclarativeDebugService::objectToString(QObject *obj)

{

    if(!obj)

        return QLatin1String("NULL");

    QString objectName = obj->objectName();

    if(objectName.isEmpty())

        objectName = QLatin1String("<unnamed>");

    QString rv = QString::fromUtf8(obj->metaObject()->className()) + 

                 QLatin1String(": ") + objectName;

    return rv;

}

void QDeclarativeDebugService::sendMessage(const QByteArray &message)

{

    Q_D(QDeclarativeDebugService);

    if (!d->server || !d->server->d_func()->connection)

        return;

    QPacket pack;

    pack << d->name << message;

    d->server->d_func()->protocol->send(pack);

    d->server->d_func()->connection->flush();

}

void QDeclarativeDebugService::enabledChanged(bool)

{

}

void QDeclarativeDebugService::messageReceived(const QByteArray &)

{

}

QT_END_NAMESPACE

#include <qdeclarativedebugservice.moc>