/**
 * @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 "lleditmenuhandler.h"

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

#include "llviewermediaobserver.h"

#include "llpluginclassmedia.h"

class LLViewerMediaImpl;
class LLUUID;
class LLViewerMediaTexture;
class LLMediaEntry;
class LLVOVolume ;
class LLMimeDiscoveryResponder;

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

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

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

class LLViewerMediaImpl;

class LLViewerMedia
{
	LOG_CLASS(LLViewerMedia);
	public:

		// String to get/set media autoplay in gSavedSettings
		static const char *AUTO_PLAY_MEDIA_SETTING;
	
		typedef std::vector<LLViewerMediaImpl*> impl_list;

		// 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 LLUUID& texture_id,
												S32 media_width = 0, 
												S32 media_height = 0, 
												U8 media_auto_scale = false,
												U8 media_loop = false);

		static viewer_media_t updateMediaImpl(LLMediaEntry* media_entry, const std::string& previous_url, bool update_from_self);
		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 bool isMusicPlaying();

		static void initClass();
		static void cleanupClass();

		static void toggleMusicPlay(void*);
		static void toggleMediaPlay(void*);
		static void mediaStop(void*);
		static F32 getVolume();	
		static void muteListChanged();
		static void setInWorldMediaDisabled(bool disabled);
		static bool getInWorldMediaDisabled();
				
		// Returns the priority-sorted list of all media impls.
		static impl_list &getPriorityList();
		
		// This is the comparitor used to sort the list.
		static bool priorityComparitor(const LLViewerMediaImpl* i1, const LLViewerMediaImpl* i2);
};

// 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 LLUUID& texture_id,
		S32 media_width, 
		S32 media_height, 
		U8 media_auto_scale,
		U8 media_loop);

	~LLViewerMediaImpl();
	
	// Override inherited version from LLViewerMediaEventEmitter 
	virtual void emitEvent(LLPluginClassMedia* self, LLViewerMediaObserver::EMediaEvent event);

	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);
	void loadURI();
	LLPluginClassMedia* getMediaPlugin() { return mMediaSource; }
	void setSize(int width, int height);

	void play();
	void stop();
	void pause();
	void start();
	void seek(F32 time);
	void skipBack(F32 step_scale);
	void skipForward(F32 step_scale);
	void setVolume(F32 volume);
	void updateVolume();
	F32 getVolume();
	void focus(bool focus);
	// True if the impl has user focus.
	bool hasFocus() const;
	void mouseDown(S32 x, S32 y, MASK mask, S32 button = 0);
	void mouseUp(S32 x, S32 y, MASK mask, S32 button = 0);
	void mouseMove(S32 x, S32 y, MASK mask);
	void mouseDown(const LLVector2& texture_coords, MASK mask, S32 button = 0);
	void mouseUp(const LLVector2& texture_coords, MASK mask, S32 button = 0);
	void mouseMove(const LLVector2& texture_coords, MASK mask);
	void mouseDoubleClick(S32 x,S32 y, MASK mask, S32 button = 0);
	void scrollWheel(S32 x, S32 y, MASK mask);
	void mouseCapture();
	
	void navigateBack();
	void navigateForward();
	void navigateReload();
	void navigateHome();
	void unload();
	void navigateTo(const std::string& url, const std::string& mime_type = "", bool rediscover_type = false, bool server_request = false);
	void navigateInternal();
	void navigateStop();
	bool handleKeyHere(KEY key, MASK mask);
	bool handleUnicodeCharHere(llwchar uni_char);
	bool canNavigateForward();
	bool canNavigateBack();
	std::string getMediaURL() const { return mMediaURL; }
	std::string getCurrentMediaURL();
	std::string getHomeURL() { return mHomeURL; }
    void setHomeURL(const std::string& home_url) { mHomeURL = home_url; };
	std::string getMimeType() { return mMimeType; }
	void scaleMouse(S32 *mouse_x, S32 *mouse_y);
	void scaleTextureCoords(const LLVector2& texture_coords, S32 *x, S32 *y);

	void update();
	void updateImagesMediaStreams();
	LLUUID getMediaTextureID() const;
	
	void suspendUpdates(bool suspend) { mSuspendUpdates = suspend; };
	void setVisible(bool visible);
	bool getVisible() const { return mVisible; };

	bool isMediaPlaying();
	bool isMediaPaused();
	bool hasMedia() const;
	bool isMediaFailed() const { return mMediaSourceFailed; };
	void resetPreviousMediaState();
	
	void setDisabled(bool disabled) { mIsDisabled = disabled; };
	bool isMediaDisabled() const { return mIsDisabled; };

	// returns true if this instance should not be loaded (disabled, muted object, crashed, etc.)
	bool isForcedUnloaded() const;
	
	// returns true if this instance could be playable based on autoplay setting, current load state, etc.
	bool isPlayable() const;
	
	void setIsParcelMedia(bool is_parcel_media) { mIsParcelMedia = is_parcel_media; };
	bool isParcelMedia() const { return mIsParcelMedia; };

	ECursorType getLastSetCursor() { return mLastSetCursor; };
	
	// 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, MASK mask) { 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*/ std::string getName() const;

	/*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* plugin, 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;
	
	void addObject(LLVOVolume* obj) ;
	void removeObject(LLVOVolume* obj) ;
	const std::list< LLVOVolume* >* getObjectList() const ;
	LLVOVolume *getSomeObject();
	void setUpdated(BOOL updated) ;
	BOOL isUpdated() ;
	
	// Updates the "interest" value in this object
	void calculateInterest();
	F64 getInterest() const { return mInterest; };
	F64 getApproximateTextureInterest();
	S32 getProximity() const { return mProximity; };
	F64 getProximityDistance() const { return mProximityDistance; };
	
	// Mark this object as being used in a UI panel instead of on a prim
	// This will be used as part of the interest sorting algorithm.
	void setUsedInUI(bool used_in_ui);
	bool getUsedInUI() const { return mUsedInUI; };
	
	F64 getCPUUsage() const;
	
	void setPriority(LLPluginClassMedia::EPriority priority);
	LLPluginClassMedia::EPriority getPriority() { return mPriority; };

	void setLowPrioritySizeLimit(int size);
	
	typedef enum 
	{
		MEDIANAVSTATE_NONE,										// State is outside what we need to track for navigation.
		MEDIANAVSTATE_BEGUN,									// a MEDIA_EVENT_NAVIGATE_BEGIN has been received which was not server-directed
		MEDIANAVSTATE_FIRST_LOCATION_CHANGED,					// first LOCATION_CHANGED event after a non-server-directed BEGIN
		MEDIANAVSTATE_COMPLETE_BEFORE_LOCATION_CHANGED,			// we received a NAVIGATE_COMPLETE event before the first LOCATION_CHANGED
		MEDIANAVSTATE_SERVER_SENT,								// server-directed nav has been requested, but MEDIA_EVENT_NAVIGATE_BEGIN hasn't been received yet
		MEDIANAVSTATE_SERVER_BEGUN,								// MEDIA_EVENT_NAVIGATE_BEGIN has been received which was server-directed
		MEDIANAVSTATE_SERVER_FIRST_LOCATION_CHANGED,			// first LOCATION_CHANGED event after a server-directed BEGIN
		MEDIANAVSTATE_SERVER_COMPLETE_BEFORE_LOCATION_CHANGED	// we received a NAVIGATE_COMPLETE event before the first LOCATION_CHANGED
		
	}EMediaNavState;
    
	// Returns the current nav state of the media.
	// note that this will be updated BEFORE listeners and objects receive media messages 
	EMediaNavState getNavState() { return mMediaNavState; }
	void setNavState(EMediaNavState state);
	
	void cancelMimeTypeProbe();
public:
	// a single media url with some data and an impl.
	LLPluginClassMedia* mMediaSource;
	LLUUID mTextureId;
	bool  mMovieImageHasMips;
	std::string mMediaURL;			// The last media url set with NavigateTo
	std::string mHomeURL;
	std::string mMimeType;
	std::string mCurrentMediaURL;	// The most current media url from the plugin (via the "location changed" or "navigate complete" events).
	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;
	S32 mTextureUsedWidth;
	S32 mTextureUsedHeight;
	bool mSuspendUpdates;
	bool mVisible;
	ECursorType mLastSetCursor;
	EMediaNavState mMediaNavState;
	F64 mInterest;
	bool mUsedInUI;
	bool mHasFocus;
	LLPluginClassMedia::EPriority mPriority;
	bool mNavigateRediscoverType;
	bool mNavigateServerRequest;
	bool mMediaSourceFailed;
	F32 mRequestedVolume;
	bool mIsMuted;
	bool mNeedsMuteCheck;
	int mPreviousMediaState;
	F64 mPreviousMediaTime;
	bool mIsDisabled;
	bool mIsParcelMedia;
	S32 mProximity;
	F64 mProximityDistance;
	LLMimeDiscoveryResponder *mMimeTypeProbe;
	
private:
	BOOL mIsUpdated ;
	std::list< LLVOVolume* > mObjectList ;

private:
	LLViewerMediaTexture *updatePlaceholderImage();
};

#endif	// LLVIEWERMEDIA_H