//! Copyright (C) 2013 Roland Winklmeier
//! This Source Code Form is subject to the terms of the Mozilla Public
//! License, v. 2.0. If a copy of the MPL was not distributed with this
//! file, You can obtain one at http://mozilla.org/MPL/2.0/

#ifndef BLACKMISC_MESSAGE_FACTORY_H
#define BLACKMISC_MESSAGE_FACTORY_H

#include <QHash>
#include "blackmisc/message.h"
#include "blackmisc/gui_messages.h"
#include "blackmisc/debug.h"
#include "blackmisc/context.h"

#define REGISTER_MESSAGE(classname, msgName) new MessageCreatorImpl<classname>(#msgName);


namespace BlackMisc
{
class IMessageCreator
{
public:
    IMessageCreator(const QString &messageID);
    virtual IMessage *create() = 0;
    virtual ~IMessageCreator() {}
};

template <class T>
class MessageCreatorImpl : public IMessageCreator
{
public:
    MessageCreatorImpl(const QString &messageID) : IMessageCreator(messageID) {}
    virtual IMessage *create() { return new T; }
};

class CMessageFactory : public QObject
{
    Q_OBJECT

    // safe singleton declaration
    SINGLETON_CLASS_DECLARATION(CMessageFactory)

    CMessageFactory() { }
public:

    virtual ~CMessageFactory();

    IMessage *create(const QString &messageID);

    void registerMessage(const QString &messageID, IMessageCreator *creator);
    static void registerMessages();

private:

    typedef QHash<QString, IMessageCreator *> TMessageCreatorHash;
    TMessageCreatorHash m_creators;
};

} // namespace BlackMisc

#endif // BLACKMISC_MESSAGE_FACTORY_H