// -*- c++ -*-
/*
 *  This file is part of the KDE libraries
 *  Copyright (c) 2003 Leo Savernik <l.savernik@aon.at>
 *  Derived from slave.h
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/

#ifndef KIO_DATASLAVE_H
#define KIO_DATASLAVE_H

#include "global.h"
#include "slave.h"

class QTimer;

// don't forget to sync DISPATCH_IMPL in dataslave_p.h
#define DISPATCH_DECL(type) \
    void dispatch_##type();

// don't forget to sync DISPATCH_IMPL1 in dataslave_p.h
#define DISPATCH_DECL1(type, paramtype, param) \
    void dispatch_##type(paramtype param);

namespace KIO
{

/**
 * This class provides a high performance implementation for the data
 * url scheme (rfc2397).
 *
 * @internal
 * Do not use this class in external applications. It is an implementation
 * detail of KIO and subject to change without notice.
 * @author Leo Savernik
 */
class DataSlave : public KIO::Slave
{
    Q_OBJECT
public:
    DataSlave();

    ~DataSlave() override;

    virtual void setHost(const QString &host, quint16 port,
                         const QString &user, const QString &passwd) override;
    void setConfig(const MetaData &config) override;

    void suspend() override;
    void resume() override;
    bool suspended() override;
    void send(int cmd, const QByteArray &arr = QByteArray()) override;

    void hold(const QUrl &url) override;

    // pure virtual methods that are defined by the actual protocol
    virtual void get(const QUrl &url) = 0;
    virtual void mimetype(const QUrl &url) = 0;

protected:
    /**
    * Sets metadata
     * @internal
     */
    void setAllMetaData(const MetaData &);
    /**
     * Sends metadata set with setAllMetaData
     * @internal
     */
    void sendMetaData();

    // queuing methods
    /** identifiers of functions to be queued */
    enum QueueType { Queue_mimeType = 1, Queue_totalSize,
                     Queue_sendMetaData, Queue_data, Queue_finished
                   };
    /** structure for queuing. It is very primitive, it doesn't
     * even try to conserve memory.
     */
    struct QueueStruct {
        QueueType type;
        QString s;
        KIO::filesize_t size;
        QByteArray ba;

        QueueStruct() {}
        QueueStruct(QueueType type) : type(type) {}
    };
    typedef QList<QueueStruct> DispatchQueue;
    DispatchQueue dispatchQueue;

    DISPATCH_DECL1(mimeType, const QString &, s)
    DISPATCH_DECL1(totalSize, KIO::filesize_t, size)
    DISPATCH_DECL(sendMetaData)
    DISPATCH_DECL1(data, const QByteArray &, ba)
    DISPATCH_DECL(finished)

protected Q_SLOTS:
    /** dispatches next queued method. Does nothing if there are no
     * queued methods.
     */
    void dispatchNext();
private:
    MetaData meta_data;
    bool _suspended;
    QTimer *timer;
};

}

#undef DISPATCH_DECL
#undef DISPATCH_DECL1

#endif
