/** 
 * @file llviewertexturelinumimagest.h
 * @brief Object for managing the list of images within a region
 *
 * $LicenseInfo:firstyear=2000&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLVIEWERTEXTURELIST_H					
#define LL_LLVIEWERTEXTURELIST_H

#include "lluuid.h"
//#include "message.h"
#include "llgl.h"
#include "llviewertexture.h"
#include "llui.h"
#include <list>
#include <set>
#include "lluiimage.h"

#include "absl/container/flat_hash_map.h"

const U32 LL_IMAGE_REZ_LOSSLESS_CUTOFF = 128;

const BOOL MIPMAP_YES = TRUE;
const BOOL MIPMAP_NO = FALSE;

const BOOL GL_TEXTURE_YES = TRUE;
const BOOL GL_TEXTURE_NO = FALSE;

const BOOL IMMEDIATE_YES = TRUE;
const BOOL IMMEDIATE_NO = FALSE;

class LLImageJ2C;
class LLMessageSystem;
class LLTextureView;

typedef	void (*LLImageCallback)(BOOL success,
								LLViewerFetchedTexture *src_vi,
								LLImageRaw* src,
								LLImageRaw* src_aux,
								S32 discard_level,
								BOOL final,
								void* userdata);

enum ETexListType
{
    TEX_LIST_STANDARD = 0,
    TEX_LIST_SCALE
};

struct LLTextureKey
{
    LLTextureKey();
    LLTextureKey(LLUUID id, ETexListType tex_type);
    LLUUID textureId;
    ETexListType textureType;

    friend bool operator<(const LLTextureKey& key1, const LLTextureKey& key2)
    {
        if (key1.textureId != key2.textureId)
        {
            return key1.textureId < key2.textureId;
        }
        else
        {
            return key1.textureType < key2.textureType;
        }
    }

	friend bool operator==(const LLTextureKey& lhs, const LLTextureKey& rhs)
	{
		return lhs.textureId == rhs.textureId && lhs.textureType == rhs.textureType;
	}

	template <typename H>
	friend H AbslHashValue(H h, const LLTextureKey& id) 
	{
		return H::combine(std::move(h), id.textureId, id.textureType);
	}
};

class LLViewerTextureList
{
	friend class LLTextureView;
	friend class LLViewerTextureManager;
	friend class LLLocalBitmap;
	
public:
	static BOOL createUploadFile(const std::string& filename, const std::string& out_filename, const U8 codec);
	static LLPointer<LLImageJ2C> convertToUploadFile(LLPointer<LLImageRaw> raw_image);
	static void processImageNotInDatabase( LLMessageSystem *msg, void **user_data );
	static void receiveImageHeader(LLMessageSystem *msg, void **user_data);
	static void receiveImagePacket(LLMessageSystem *msg, void **user_data);

public:
	LLViewerTextureList();
	~LLViewerTextureList();

	void init();
	void shutdown();
	void dump();
	void destroyGL(BOOL save_state = TRUE);
	void restoreGL();
	BOOL isInitialized() const {return mInitialized;}

	void findTexturesByID(const LLUUID &image_id, std::vector<LLViewerFetchedTexture*> &output);
	LLViewerFetchedTexture *findImage(const LLUUID &image_id, ETexListType tex_type);
	LLViewerFetchedTexture *findImage(const LLTextureKey &search_key);

	void dirtyImage(LLViewerFetchedTexture *image);
	
	// Using image stats, determine what images are necessary, and perform image updates.
	void updateImages(F32 max_time);
	void forceImmediateUpdate(LLViewerFetchedTexture* imagep) ;

	// Decode and create textures for all images currently in list.
	void decodeAllImages(F32 max_decode_time); 

	void handleIRCallback(void **data, const S32 number);

	S32Megabytes	getMaxResidentTexMem() const	{ return mMaxResidentTexMemInMegaBytes; }
	S32Megabytes getMaxTotalTextureMem() const   { return mMaxTotalTextureMemInMegaBytes;}
	S32 getNumImages()					{ return mImageList.size(); }

	void updateMaxResidentTexMem(S32Megabytes mem);
	
	void doPreloadImages();
	void doPrefetchImages();

	void clearFetchingRequests();
	void setDebugFetching(LLViewerFetchedTexture* tex, S32 debug_level);

	static S32Megabytes getMinVideoRamSetting();
	static S32Megabytes getMaxVideoRamSetting(bool get_recommended, float mem_multiplier);

	static bool isPrioRequestsFetched();
	
private:
	void updateImagesDecodePriorities();
	F32  updateImagesCreateTextures(F32 max_time);
	F32  updateImagesFetchTextures(F32 max_time);
	void updateImagesUpdateStats();
	F32  updateImagesLoadingFastCache(F32 max_time);

	void addImage(LLViewerFetchedTexture *image, ETexListType tex_type);
	void deleteImage(LLViewerFetchedTexture *image);

	void addImageToList(LLViewerFetchedTexture *image);
	void removeImageFromList(LLViewerFetchedTexture *image);

	LLViewerFetchedTexture * getImage(const LLUUID &image_id,									 
									 FTType f_type = FTT_DEFAULT,
									 BOOL usemipmap = TRUE,
									 LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_NONE,		// Get the requested level immediately upon creation.
									 S8 texture_type = LLViewerTexture::FETCHED_TEXTURE,
									 LLGLint internal_format = 0,
									 LLGLenum primary_format = 0,
									 LLHost request_from_host = LLHost()
									 );
	
	LLViewerFetchedTexture * getImageFromFile(const std::string& filename,									 
									 FTType f_type = FTT_LOCAL_FILE,
									 BOOL usemipmap = TRUE,
									 LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_NONE,		// Get the requested level immediately upon creation.
									 S8 texture_type = LLViewerTexture::FETCHED_TEXTURE,
									 LLGLint internal_format = 0,
									 LLGLenum primary_format = 0,
									 const LLUUID& force_id = LLUUID::null
									 );
	
	LLViewerFetchedTexture* getImageFromUrl(const std::string& url,
									 FTType f_type,
									 BOOL usemipmap = TRUE,
									 LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_NONE,		// Get the requested level immediately upon creation.
									 S8 texture_type = LLViewerTexture::FETCHED_TEXTURE,
									 LLGLint internal_format = 0,
									 LLGLenum primary_format = 0,
									 const LLUUID& force_id = LLUUID::null
									 );

	LLViewerFetchedTexture* createImage(const LLUUID &image_id,
									 FTType f_type,
									 BOOL usemipmap = TRUE,
									 LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_NONE,		// Get the requested level immediately upon creation.
									 S8 texture_type = LLViewerTexture::FETCHED_TEXTURE,
									 LLGLint internal_format = 0,
									 LLGLenum primary_format = 0,
									 LLHost request_from_host = LLHost()
									 );
	
	// Request image from a specific host, used for baked avatar textures.
	// Implemented in header in case someone changes default params above. JC
	LLViewerFetchedTexture* getImageFromHost(const LLUUID& image_id, FTType f_type, const LLHost& host)
	{ return getImage(image_id, f_type, TRUE, LLGLTexture::BOOST_NONE, LLViewerTexture::LOD_TEXTURE, 0, 0, host); }	

public:
	typedef std::set<LLPointer<LLViewerFetchedTexture> > image_list_t;	
	image_list_t mLoadingStreamList;
	image_list_t mCreateTextureList;
	image_list_t mCallbackList;
	image_list_t mFastCacheList;

	// Note: just raw pointers because they are never referenced, just compared against
	std::set<LLViewerFetchedTexture*> mDirtyTextureList;
	
	BOOL mForceResetTextureStats;
    
private:
    using uuid_map_t = std::map< LLTextureKey, LLPointer<LLViewerFetchedTexture> >;
    using uuid_hash_map_t = absl::flat_hash_map< LLTextureKey, LLViewerFetchedTexture* >;
    uuid_map_t mUUIDMap;
    uuid_hash_map_t mUUIDHashMap;
    LLTextureKey mLastUpdateKey;
    LLTextureKey mLastFetchKey;
	
	typedef std::set<LLPointer<LLViewerFetchedTexture>, LLViewerFetchedTexture::Compare> image_priority_list_t;	
	image_priority_list_t mImageList;

	// simply holds on to LLViewerFetchedTexture references to stop them from being purged too soon
	std::set<LLPointer<LLViewerFetchedTexture> > mImagePreloads;

	BOOL mInitialized ;
	S32Megabytes	mMaxResidentTexMemInMegaBytes;
	S32Megabytes mMaxTotalTextureMemInMegaBytes;
	LLFrameTimer mForceDecodeTimer;
	
private:
	static S32 sNumImages;
	static void (*sUUIDCallback)(void**, const LLUUID &);
    LOG_CLASS(LLViewerTextureList);
};

class LLUIImageList : public LLImageProviderInterface, public LLSingleton<LLUIImageList>
{
	LLSINGLETON_EMPTY_CTOR(LLUIImageList);
public:
	// LLImageProviderInterface
	/*virtual*/ LLPointer<LLUIImage> getUIImageByID(const LLUUID& id, S32 priority);
	/*virtual*/ LLPointer<LLUIImage> getUIImage(const std::string& name, S32 priority);
	void cleanUp();

	bool initFromFile();

	LLPointer<LLUIImage> preloadUIImage(const std::string& name, const std::string& filename, BOOL use_mips, const LLRect& scale_rect, const LLRect& clip_rect, LLUIImage::EScaleStyle stype);
	
	static void onUIImageLoaded( BOOL success, LLViewerFetchedTexture *src_vi, LLImageRaw* src, LLImageRaw* src_aux, S32 discard_level, BOOL final, void* userdata );
private:
	LLPointer<LLUIImage> loadUIImageByName(const std::string& name, const std::string& filename,
		                           BOOL use_mips = FALSE, const LLRect& scale_rect = LLRect::null, 
								   const LLRect& clip_rect = LLRect::null,
		                           LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_UI,
								   LLUIImage::EScaleStyle = LLUIImage::SCALE_INNER);
	LLPointer<LLUIImage> loadUIImageByID(const LLUUID& id,
								 BOOL use_mips = FALSE, const LLRect& scale_rect = LLRect::null, 
								 const LLRect& clip_rect = LLRect::null,
								 LLViewerTexture::EBoostLevel boost_priority = LLGLTexture::BOOST_UI,
								 LLUIImage::EScaleStyle = LLUIImage::SCALE_INNER);

	LLPointer<LLUIImage> loadUIImage(LLViewerFetchedTexture* imagep, const std::string& name, BOOL use_mips = FALSE, const LLRect& scale_rect = LLRect::null, const LLRect& clip_rect = LLRect::null, LLUIImage::EScaleStyle = LLUIImage::SCALE_INNER);


	struct LLUIImageLoadData
	{
		std::string mImageName;
		LLRect mImageScaleRegion;
		LLRect mImageClipRegion;
	};

	typedef absl::flat_hash_map< std::string, LLPointer<LLUIImage> > uuid_ui_image_map_t;
	uuid_ui_image_map_t mUIImages;

	//
	//keep a copy of UI textures to prevent them to be deleted.
	//mGLTexturep of each UI texture equals to some LLUIImage.mImage.
	std::list< LLPointer<LLViewerFetchedTexture> > mUITextureList ;
};

const BOOL GLTEXTURE_TRUE = TRUE;
const BOOL GLTEXTURE_FALSE = FALSE;
const BOOL MIPMAP_TRUE = TRUE;
const BOOL MIPMAP_FALSE = FALSE;

extern LLViewerTextureList gTextureList;

#endif
