/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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 3 of the License, or
 *  (at your option) any later version.
 * 
 *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _THUMBIMAGEUPDATER_
#define _THUMBIMAGEUPDATER_

#include <glibmm.h>
#include <rtengine.h>
#include <thumbnail.h>
#include <glib.h>

class ThumbImageUpdateListener {

public:

	/** 
	 * @brief Called when thumbnail image is update
	 * 
	 * @param img new thumbnail image
	 * @param scale scale (??)
	 * @param cropParams how it was cropped (??)
	 *
	 * @note no locks are held when called back
	 */
	virtual void updateImage (rtengine::IImage8* img, double scale, rtengine::procparams::CropParams cropParams) {}
};

class ThumbImageUpdater {

  public:

	/** 
	 * @brief Singleton entry point.
	 * 
	 * @return Pointer to thumbnail image updater.
	 */
	static ThumbImageUpdater* getInstance(void);

	/** 
	 * @brief Add an thumbnail image update request.
	 *
	 * Code will add the request to the queue and, if needed, start a pool
	 * thread to process it.
	 * 
	 * @param t thumbnail
	 * @param params processing params (?)
	 * @param height how big
	 * @param priority if \c true then run as soon as possible
	 * @param l listener waiting on update
	 */
    void add(Thumbnail* t, const rtengine::procparams::ProcParams& params,
					int height, bool* priority, bool upgrade, ThumbImageUpdateListener* l);

	/** 
	 * @brief Remove jobs associated with listener \c l.
	 * 
	 * Jobs being processed will be finished. Will not return till all jobs for
	 * \c l have been completed.
	 *
	 * @param listener jobs associated with this will be stopped
	 */
    void removeJobs(ThumbImageUpdateListener* listener);

	/** 
	 * @brief Stop processing and remove all jobs.
	 *
	 * Will not return till all running jobs have completed.
	 */
    void removeAllJobs(void);

  private:

	ThumbImageUpdater();

	class Impl;
	Impl* impl_;
};

/** 
 * @brief Singleton boiler plate.
 *
 * To use: \c thumbImageUpdater->start() ,
 */
#define thumbImageUpdater ThumbImageUpdater::getInstance()

#endif
