#ifndef KVI_ANIMATEDPIXMAPCACHE_H_
#define KVI_ANIMATEDPIXMAPCACHE_H_
//=============================================================================
//
//   File : KviAnimatedPixmapCache.h
//   Creation date : Thu Jul 31 2008 01:45:21 CEST by Alexey Uzhva
//
//   This file is part of the KVIrc IRC client distribution
//   Copyright (C) 2008 Alexey Uzhva (wizard at opendoor dot ru)
//
//   This program is FREE software. You can redistribute it and/or
//   modify it under the terms of the GNU General Public License
//   as published by the Free Software Foundation; either version 2
//   of the License, or (at your option) any later version.
//
//   This program 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 General Public License for more details.
//
//   You should have received a copy of the GNU General Public License
//   along with this program. If not, write to the Free Software Foundation,
//   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================

#include "kvi_settings.h"
#include "KviAnimatedPixmapInterface.h"

#include <QMultiHash>
#include <QMultiMap>
#include <QMutex>
#include <QObject>
#include <QPixmap>
#include <QTimer>

class KVILIB_API KviAnimatedPixmapCache : public QObject
{
	Q_OBJECT
public:
	/*
	 * This subclass represents simple structure
	 * to store animated frame data: cached pixmap, and next frame delay.
	 *
	 * It provides copyconstructor, which makes possible to simple
	 * assign two containers with this classes.
	 *
	 * All data will be duplicated in such case.
	 */
	class FrameInfo
	{
	public:
		QPixmap * pixmap; //frame pixmap
		uint delay;       //next frame delay

		FrameInfo(QPixmap * _pixmap, uint _delay)
		{
			pixmap = _pixmap;
			delay = _delay;
		}

		FrameInfo(const FrameInfo & source)
		{
			pixmap = source.pixmap;
			delay = source.delay;
		}

		void detach()
		{
			pixmap = new QPixmap(*pixmap);
		}
	};

	/*
	 * This helper class represents data structure
	 * for storing frames.
	 *
	 * It adds references counter and
	 * mutex, to provide thread-safety.
	 */
	class Data : public QList<FrameInfo>
	{
	public:
		uint refs;    //references count
		QSize size;   //size of the pixmaps
		QString file; //just to speedup the cache
		bool resized;

		Data(QString szFile) : QList<FrameInfo>(), refs(0), file(szFile), resized(false)
		{
		}

		Data(Data & other) : QList<FrameInfo>(other), refs(0), file(other.file), resized(false)
		{
			for(int i = 0; i < count(); i++)
			{
				this->operator[](i).detach();
			}
		}
	};

protected:
	//
	// This class is a singleton.
	// It can't be created directly
	//
	KviAnimatedPixmapCache();
	virtual ~KviAnimatedPixmapCache();

protected:
	mutable QMutex m_cacheMutex;
	mutable QMutex m_timerMutex;

	QMultiHash<QString, Data *> m_hCache;
	QMultiMap<long long, KviAnimatedPixmapInterface *> m_timerData;
	QTimer m_animationTimer;

	static KviAnimatedPixmapCache * m_pInstance;

protected:
	Data * internalLoad(const QString & szFile, int iWidth = 0, int iHeight = 0);
	Data * internalResize(Data * data, const QSize & size);
	void internalFree(Data * data);

	void internalScheduleFrameChange(uint delay, KviAnimatedPixmapInterface * receiver);
	void internalNotifyDelete(KviAnimatedPixmapInterface * receiver);

protected slots:
	virtual void timeoutEvent();

public:
	static void init();
	static void done();

	static void scheduleFrameChange(uint delay, KviAnimatedPixmapInterface * receiver)
	{
		m_pInstance->internalScheduleFrameChange(delay, receiver);
	}

	static Data * load(const QString & szFileName, int iWidth = 0, int iHeight = 0)
	{
		return m_pInstance->internalLoad(szFileName, iWidth, iHeight);
	}

	static Data * resize(Data * data, const QSize & size)
	{
		return m_pInstance->internalResize(data, size);
	}

	static void free(Data * data)
	{
		m_pInstance->internalFree(data);
	}

	static QPixmap * dummyPixmap();

	static void notifyDelete(KviAnimatedPixmapInterface * receiver)
	{
		m_pInstance->internalNotifyDelete(receiver);
	}
};

#endif /* KVI_ANIMATEDPIXMAPCACHE_H_ */