/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Messaging Framework.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** accordance with the commercial license agreement provided with the
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****************************************************************************/

#ifndef QMAILMESSAGEBUFFER_H
#define QMAILMESSAGEBUFFER_H

#include <QObject>
#include <QList>
#include <QTime>
#include <QVariant>

class QMailMessage;
class QMailMessageBufferPrivate;

#include <qmailglobal.h>


class MESSAGESERVER_EXPORT QMailMessageBufferFlushCallback
{
public:
    virtual ~QMailMessageBufferFlushCallback() {}
    virtual void messageFlushed(QMailMessage *message) = 0;
};

class MESSAGESERVER_EXPORT QMailMessageBuffer : public QObject
{
    Q_OBJECT
public:
    QMailMessageBuffer(QObject *parent = Q_NULLPTR);
    virtual ~QMailMessageBuffer();

    static QMailMessageBuffer *instance();

    bool addMessage(QMailMessage *message);
    bool updateMessage(QMailMessage *message);
    bool setCallback(QMailMessage *message, QMailMessageBufferFlushCallback *callback);
    int maximumBufferSize() const;

    void flush();

    void removeCallback(QMailMessageBufferFlushCallback *callback);

Q_SIGNALS:
    void flushed();

private Q_SLOTS:
    void messageTimeout();
    void readConfig();

private:
    friend class QMailMessageBufferPrivate;
    struct BufferItem
    {
        BufferItem(bool _add, QMailMessageBufferFlushCallback *_callback, QMailMessage *_message)
            : add(_add)
            , callback(_callback)
            , message(_message)
        {}

        bool add;
        QMailMessageBufferFlushCallback *callback;
        QMailMessage *message;
    };

    void messageFlush();
    int messagePending();
    bool isFull();
    BufferItem *get_item(QMailMessage *message);

    QScopedPointer<QMailMessageBufferPrivate> d;
};

#endif