/**
 * @file llviewermedia.h
 * @brief Client interface to the media engine
 *
 * $LicenseInfo:firstyear=2007&license=viewergpl$
 * 
 * Copyright (c) 2007-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#ifndef LLVIEWERMEDIA_H
#define LLVIEWERMEDIA_H

#include "llfocusmgr.h"

#include "llpanel.h"
#include "llpluginclassmediaowner.h"

#include "llviewermediaobserver.h"

class LLViewerMediaImpl;
class LLUUID;
class LLViewerImage;

typedef LLPointer<LLViewerMediaImpl> viewer_media_t;
///////////////////////////////////////////////////////////////////////////////
//
class LLViewerMediaEventEmitter
{
public:
	virtual ~LLViewerMediaEventEmitter();

	bool addObserver( LLViewerMediaObserver* subject );
	bool remObserver( LLViewerMediaObserver* subject );
	void emitEvent(LLPluginClassMedia* self, LLPluginClassMediaOwner::EMediaEvent event);

private:
	typedef std::list< LLViewerMediaObserver* > observerListType;
	observerListType mObservers;
};

class LLViewerMedia
{
	LOG_CLASS(LLViewerMedia);
	public:
		// Special case early init for just web browser component
		// so we can show login screen.  See .cpp file for details. JC

		static viewer_media_t newMediaImpl(const std::string& media_url,
												const LLUUID& texture_id,
												S32 media_width, 
												S32 media_height, 
												U8 media_auto_scale,
												U8 media_loop,
												std::string mime_type = "none/none");

		static void removeMedia(LLViewerMediaImpl* media);
		static LLViewerMediaImpl* getMediaImplFromTextureID(const LLUUID& texture_id);
		static std::string getCurrentUserAgent();
		static void updateBrowserUserAgent();
		static bool handleSkinCurrentChanged(const LLSD& /*newvalue*/);
		static bool textureHasMedia(const LLUUID& texture_id);
		static void setVolume(F32 volume);

		static void updateMedia();

		static void cleanupClass();

};

// Implementation functions not exported into header file
class LLViewerMediaImpl
	:	public LLMouseHandler, public LLRefCount, public LLPluginClassMediaOwner, public LLViewerMediaEventEmitter, public LLEditMenuHandler
{
	LOG_CLASS(LLViewerMediaImpl);
public:

	LLViewerMediaImpl(const std::string& media_url,
		const LLUUID& texture_id,
		S32 media_width, 
		S32 media_height, 
		U8 media_auto_scale,
		U8 media_loop,
		const std::string& mime_type);

	~LLViewerMediaImpl();
	void createMediaSource();
	void destroyMediaSource();
	void setMediaType(const std::string& media_type);
	bool initializeMedia(const std::string& mime_type);
	bool initializePlugin(const std::string& media_type);
	LLPluginClassMedia* getMediaPlugin() { return mMediaSource; }
	void setSize(int width, int height);

	void play();
	void stop();
	void pause();
	void start();
	void seek(F32 time);
	void setVolume(F32 volume);
	void focus(bool focus);
	void mouseDown(S32 x, S32 y);
	void mouseUp(S32 x, S32 y);
	void mouseMove(S32 x, S32 y);
	void mouseLeftDoubleClick(S32 x,S32 y );
	void mouseCapture();

	void navigateHome();
	void navigateTo(const std::string& url, const std::string& mime_type = "", bool rediscover_type = false);
	void navigateStop();
	bool handleKeyHere(KEY key, MASK mask);
	bool handleUnicodeCharHere(llwchar uni_char);
	bool canNavigateForward();
	bool canNavigateBack();
	std::string getMediaURL() { return mMediaURL; }
	std::string getMediaHomeURL() { return mHomeURL; }
	std::string getMimeType() { return mMimeType; }
	void getTextureSize(S32 *texture_width, S32 *texture_height);
	void scaleMouse(S32 *mouse_x, S32 *mouse_y);

	void update();
	void updateMovieImage(const LLUUID& image_id, BOOL active);
	void updateImagesMediaStreams();
	LLUUID getMediaTextureID();
	
	void suspendUpdates(bool suspend) { mSuspendUpdates = suspend; };
	void setVisible(bool visible);

	bool isMediaPlaying();
	bool isMediaPaused();
	bool hasMedia();

	// utility function to create a ready-to-use media instance from a desired media type.
	static LLPluginClassMedia* newSourceFromMediaType(std::string media_type, LLPluginClassMediaOwner *owner /* may be NULL */, S32 default_width, S32 default_height);

	// Internally set our desired browser user agent string, including
	// the Second Life version and skin name.  Used because we can
	// switch skins without restarting the app.
	static void updateBrowserUserAgent();

	// Callback for when the SkinCurrent control is changed to
	// switch the user agent string to indicate the new skin.
	static bool handleSkinCurrentChanged(const LLSD& newvalue);

	// need these to handle mouseup...
	/*virtual*/ void	onMouseCaptureLost();
	/*virtual*/ BOOL	handleMouseUp(S32 x, S32 y, MASK mask);

	// Grr... the only thing I want as an LLMouseHandler are the onMouseCaptureLost and handleMouseUp calls.
	// Sadly, these are all pure virtual, so I have to supply implementations here:
	/*virtual*/ BOOL	handleMouseDown(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleHover(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleScrollWheel(S32 x, S32 y, S32 clicks) { return FALSE; };
	/*virtual*/ BOOL	handleDoubleClick(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleRightMouseDown(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleRightMouseUp(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleToolTip(S32 x, S32 y, std::string& msg, LLRect* sticky_rect_screen) { return FALSE; };
	/*virtual*/ BOOL	handleMiddleMouseDown(S32 x, S32 y, MASK mask) { return FALSE; };
	/*virtual*/ BOOL	handleMiddleMouseUp(S32 x, S32 y, MASK mask) {return FALSE; };
	/*virtual*/ const std::string& getName() const { return LLStringUtil::null; };
	/*virtual*/ BOOL isView() const { return FALSE; };
	/*virtual*/ void	screenPointToLocal(S32 screen_x, S32 screen_y, S32* local_x, S32* local_y) const {};
	/*virtual*/ void	localPointToScreen(S32 local_x, S32 local_y, S32* screen_x, S32* screen_y) const {};
	/*virtual*/ BOOL hasMouseCapture() { return gFocusMgr.getMouseCapture() == this; };

	// Inherited from LLPluginClassMediaOwner
	/*virtual*/ void handleMediaEvent(LLPluginClassMedia* self, LLPluginClassMediaOwner::EMediaEvent);

	// LLEditMenuHandler overrides
	/*virtual*/ void	cut();
	/*virtual*/ BOOL	canCut() const;

	/*virtual*/ void	copy();
	/*virtual*/ BOOL	canCopy() const;

	/*virtual*/ void	paste();
	/*virtual*/ BOOL	canPaste() const;
	
public:
	// a single media url with some data and an impl.
	LLPluginClassMedia* mMediaSource;
	LLUUID mTextureId;
	bool  mMovieImageHasMips;
	std::string mMediaURL;
	std::string mHomeURL;
	std::string mMimeType;
	S32 mLastMouseX;	// save the last mouse coord we get, so when we lose capture we can simulate a mouseup at that point.
	S32 mLastMouseY;
	S32 mMediaWidth;
	S32 mMediaHeight;
	bool mMediaAutoScale;
	bool mMediaLoop;
	bool mNeedsNewTexture;
	bool mSuspendUpdates;
	bool mVisible;


private:
	LLViewerImage *updatePlaceholderImage();
};

#endif	// LLVIEWERMEDIA_H