/****************************************************************************
**
** Copyright (C) 2017-2015 Ford Motor Company
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtRemoteObjects module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 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 3 requirements
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** 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
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****************************************************************************/

#ifndef QCONNECTIONFACTORIES_P_H
#define QCONNECTIONFACTORIES_P_H

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

#include <QtNetwork/qabstractsocket.h>
#include <QtCore/qdatastream.h>
#include <QtCore/qiodevice.h>
#include <QtCore/qpointer.h>

#include <QtRemoteObjects/qtremoteobjectglobal.h>

QT_BEGIN_NAMESPACE

namespace QtRemoteObjects {

static const int dataStreamVersion = QDataStream::Qt_5_12;
static const QLatin1String protocolVersion("QtRO 1.2");

}

class Q_REMOTEOBJECTS_EXPORT IoDeviceBase : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY(IoDeviceBase)

public:
    explicit IoDeviceBase(QObject *parent = nullptr);
    ~IoDeviceBase() override;

    bool read(QtRemoteObjects::QRemoteObjectPacketTypeEnum &, QString &);

    virtual void write(const QByteArray &data);
    virtual void write(const QByteArray &data, qint64);
    virtual bool isOpen() const { return !isClosing(); }
    virtual void close();
    virtual qint64 bytesAvailable() const;
    virtual QIODevice *connection() const = 0;
    void initializeDataStream();
    QDataStream& stream() { return m_dataStream; }
    inline bool isClosing() const { return m_isClosing; }
    void addSource(const QString &);
    void removeSource(const QString &);
    QSet<QString> remoteObjects() const;

Q_SIGNALS:
    void readyRead();
    void disconnected();

protected:
    virtual QString deviceType() const = 0;
    virtual void doClose() = 0;
    bool m_isClosing;

private:
    quint32 m_curReadSize;
    QDataStream m_dataStream;
    QSet<QString> m_remoteObjects;
};

class Q_REMOTEOBJECTS_EXPORT ServerIoDevice : public IoDeviceBase
{
    Q_OBJECT
    Q_DISABLE_COPY(ServerIoDevice)

public:
    explicit ServerIoDevice(QObject *parent = nullptr);

protected:
    QString deviceType() const override;
};

class Q_REMOTEOBJECTS_EXPORT QConnectionAbstractServer : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY(QConnectionAbstractServer)

public:
    explicit QConnectionAbstractServer(QObject *parent = nullptr);
    ~QConnectionAbstractServer() override;

    virtual bool hasPendingConnections() const = 0;
    ServerIoDevice* nextPendingConnection();
    virtual QUrl address() const = 0;
    virtual bool listen(const QUrl &address) = 0;
    virtual QAbstractSocket::SocketError serverError() const = 0;
    virtual void close() = 0;

protected:
    virtual ServerIoDevice* configureNewConnection() = 0;

Q_SIGNALS:
    void newConnection();
};

class Q_REMOTEOBJECTS_EXPORT ClientIoDevice : public IoDeviceBase
{
    Q_OBJECT
    Q_DISABLE_COPY(ClientIoDevice)

public:
    explicit ClientIoDevice(QObject *parent = nullptr);
    ~ClientIoDevice() override;

    void disconnectFromServer();
    virtual void connectToServer() = 0;

    QUrl url() const;

Q_SIGNALS:
    void shouldReconnect(ClientIoDevice*);

protected:
    virtual void doDisconnectFromServer() = 0;
    QString deviceType() const override;

private:
    friend class QtROClientFactory;

    QUrl m_url;
};

class ExternalIoDevice : public IoDeviceBase
{
    Q_OBJECT

public:
    explicit ExternalIoDevice(QIODevice *device, QObject *parent=nullptr);
    QIODevice *connection() const override;
    bool isOpen() const override;

protected:
    void doClose() override;
    QString deviceType() const override;
    QPointer<QIODevice> m_device;
};

class QtROServerFactory
{
public:
    Q_REMOTEOBJECTS_EXPORT static QtROServerFactory *instance();

    QConnectionAbstractServer *create(const QUrl &url, QObject *parent = nullptr)
    {
        auto creatorFunc = m_creatorFuncs.value(url.scheme());
        return creatorFunc ? (*creatorFunc)(parent) : nullptr;
    }

    template<typename T>
    void registerType(const QString &id)
    {
        m_creatorFuncs[id] = [](QObject *parent) -> QConnectionAbstractServer * {
            return new T(parent);
        };
    }

    bool isValid(const QUrl &url)
    {
        return m_creatorFuncs.contains(url.scheme());
    }

private:
    friend class QtROFactoryLoader;
    QtROServerFactory();

    using CreatorFunc = QConnectionAbstractServer * (*)(QObject *);
    QHash<QString, CreatorFunc> m_creatorFuncs;
};

class QtROClientFactory
{
public:
    Q_REMOTEOBJECTS_EXPORT static QtROClientFactory *instance();

    /// creates an object from a string
    ClientIoDevice *create(const QUrl &url, QObject *parent = nullptr)
    {
        auto creatorFunc = m_creatorFuncs.value(url.scheme());
        if (!creatorFunc)
            return nullptr;

        ClientIoDevice *res = (*creatorFunc)(parent);
        if (res)
            res->m_url = url;
        return res;
    }

    template<typename T>
    void registerType(const QString &id)
    {
        m_creatorFuncs[id] = [](QObject *parent) -> ClientIoDevice * {
            return new T(parent);
        };
    }

    bool isValid(const QUrl &url)
    {
        return m_creatorFuncs.contains(url.scheme());
    }

private:
    friend class QtROFactoryLoader;
    QtROClientFactory();

    using CreatorFunc = ClientIoDevice * (*)(QObject *);
    QHash<QString, CreatorFunc> m_creatorFuncs;
};

template <typename T>
inline void qRegisterRemoteObjectsClient(const QString &id)
{
    QtROClientFactory::instance()->registerType<T>(id);
}

template <typename T>
inline void qRegisterRemoteObjectsServer(const QString &id)
{
    QtROServerFactory::instance()->registerType<T>(id);
}

QT_END_NAMESPACE

#endif