/** 
 * @file llviewerstats.h
 * @brief LLViewerStats class header file
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * 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_LLVIEWERSTATS_H
#define LL_LLVIEWERSTATS_H

#include "llstat.h"
#include "lltextureinfo.h"

class LLViewerStats : public LLSingleton<LLViewerStats>
{
public:
	LLStat	mKBitStat,
			mLayersKBitStat,
			mObjectKBitStat,
			mAssetKBitStat,
			mTextureKBitStat,
			mVFSPendingOperations,
			mFPSStat,
			mPacketsInStat,
			mPacketsLostStat,
			mPacketsOutStat,
			mPacketsLostPercentStat,
			mTexturePacketsStat,
			mActualInKBitStat,	// From the packet ring (when faking a bad connection)
			mActualOutKBitStat,	// From the packet ring (when faking a bad connection)
			mTrianglesDrawnStat;

	// Simulator stats
	LLStat	mSimTimeDilation;

	LLStat	mSimFPS,
			mSimPhysicsFPS,
			mSimAgentUPS,
			mSimScriptEPS;

	LLStat	mSimFrameMsec,
			mSimNetMsec,
			mSimSimOtherMsec,
			mSimSimPhysicsMsec;

	LLStat	mSimSimPhysicsStepMsec,
			mSimSimPhysicsShapeUpdateMsec,
			mSimSimPhysicsOtherMsec,
			mSimSimAIStepMsec,
			mSimSimSkippedSilhouetteSteps,
			mSimSimPctSteppedCharacters;

	LLStat	mSimAgentMsec,
			mSimImagesMsec,
			mSimScriptMsec,
			mSimSpareMsec,
			mSimSleepMsec,
			mSimPumpIOMsec;

	LLStat	mSimMainAgents,
			mSimChildAgents,
			mSimObjects,
			mSimActiveObjects,
			mSimActiveScripts,
			mSimPctScriptsRun;

	LLStat	mSimInPPS,
			mSimOutPPS,
			mSimPendingDownloads,
			mSimPendingUploads,
			mSimPendingLocalUploads,
			mSimTotalUnackedBytes;

	LLStat	mPhysicsPinnedTasks,
			mPhysicsLODTasks,
			mPhysicsMemoryAllocated;

	LLStat	mSimPingStat;

	LLStat	mNumImagesStat,
			mNumRawImagesStat,
			mGLTexMemStat,
			mGLBoundMemStat,
			mRawMemStat,
			mFormattedMemStat;

	LLStat	mNumObjectsStat,
			mNumActiveObjectsStat,
			mNumNewObjectsStat,
			mNumSizeCulledStat,
			mNumVisCulledStat;

	void resetStats();
public:
	// If you change this, please also add a corresponding text label in llviewerstats.cpp
	enum EStatType
	{
		ST_VERSION = 0,
		ST_AVATAR_EDIT_SECONDS = 1,
		ST_TOOLBOX_SECONDS = 2,
		ST_CHAT_COUNT = 3,
		ST_IM_COUNT = 4,
		ST_FULLSCREEN_BOOL = 5,
		ST_RELEASE_COUNT= 6,
		ST_CREATE_COUNT = 7,
		ST_REZ_COUNT = 8,
		ST_FPS_10_SECONDS = 9,
		ST_FPS_2_SECONDS = 10,
		ST_MOUSELOOK_SECONDS = 11,
		ST_FLY_COUNT = 12,
		ST_TELEPORT_COUNT = 13,
		ST_OBJECT_DELETE_COUNT = 14,
		ST_SNAPSHOT_COUNT = 15,
		ST_UPLOAD_SOUND_COUNT = 16,
		ST_UPLOAD_TEXTURE_COUNT = 17,
		ST_EDIT_TEXTURE_COUNT = 18,
		ST_KILLED_COUNT = 19,
		ST_FRAMETIME_JITTER = 20,
		ST_FRAMETIME_SLEW = 21,
		ST_INVENTORY_TOO_LONG = 22,
		ST_WEARABLES_TOO_LONG = 23,
		ST_LOGIN_SECONDS = 24,
		ST_LOGIN_TIMEOUT_COUNT = 25,
		ST_HAS_BAD_TIMER = 26,
		ST_DOWNLOAD_FAILED = 27,
		ST_LSL_SAVE_COUNT = 28,
		ST_UPLOAD_ANIM_COUNT = 29,
		ST_FPS_8_SECONDS = 30,
		ST_SIM_FPS_20_SECONDS = 31,
		ST_PHYS_FPS_20_SECONDS = 32,
		ST_LOSS_05_SECONDS = 33,
		ST_FPS_DROP_50_RATIO = 34,
		ST_ENABLE_VBO = 35,
		ST_DELTA_BANDWIDTH = 36,
		ST_MAX_BANDWIDTH = 37,
		ST_LIGHTING_DETAIL = 38,
		ST_VISIBLE_AVATARS = 39,
		ST_SHADER_OBJECTS = 40,
		ST_SHADER_ENVIRONMENT = 41,
		ST_DRAW_DIST = 42,
		ST_CHAT_BUBBLES = 43,
		ST_SHADER_AVATAR = 44,
		ST_FRAME_SECS = 45,
		ST_UPDATE_SECS = 46,
		ST_NETWORK_SECS = 47,
		ST_IMAGE_SECS = 48,
		ST_REBUILD_SECS = 49,
		ST_RENDER_SECS = 50,
		ST_CROSSING_AVG = 51,
		ST_CROSSING_MAX = 52,
		ST_LIBXUL_WIDGET_USED = 53, // Unused
		ST_WINDOW_WIDTH = 54,
		ST_WINDOW_HEIGHT = 55,
		ST_TEX_BAKES = 56,
		ST_TEX_REBAKES = 57,
		
		ST_COUNT = 58
	};

	LLViewerStats();

	// all return latest value of given stat
	F64 getStat(EStatType type) const;
	F64 setStat(EStatType type, F64 value);		// set the stat to value
	F64 incStat(EStatType type, F64 value = 1.f);	// add value to the stat

	void updateFrameStats(const F64 time_diff);
	
	void addToMessage(LLSD &body) const;

	struct  StatsAccumulator
	{
		S32 mCount;
		F32 mSum;
		F32 mSumOfSquares;
		F32 mMinValue;
		F32 mMaxValue;
		U32 mCountOfNextUpdatesToIgnore;

		inline StatsAccumulator()
		{	
			reset();
		}

		inline void push( F32 val )
		{
			if ( mCountOfNextUpdatesToIgnore > 0 )
			{
				mCountOfNextUpdatesToIgnore--;
				return;
			}
			
			mCount++;
			mSum += val;
			mSumOfSquares += val * val;
			if (mCount == 1 || val > mMaxValue)
			{
				mMaxValue = val;
			}
			if (mCount == 1 || val < mMinValue)
			{
				mMinValue = val;
			}
		}
		
		inline F32 getMean() const
		{
			return (mCount == 0) ? 0.f : ((F32)mSum)/mCount;
		}

		inline F32 getMinValue() const
		{
			return mMinValue;
		}

		inline F32 getMaxValue() const
		{
			return mMaxValue;
		}

		inline F32 getStdDev() const
		{
			const F32 mean = getMean();
			return (mCount < 2) ? 0.f : sqrt(llmax(0.f,mSumOfSquares/mCount - (mean * mean)));
		}
		
		inline U32 getCount() const
		{
			return mCount;
		}

		inline void reset()
		{
			mCount = 0;
			mSum = mSumOfSquares = 0.f;
			mMinValue = 0.0f;
			mMaxValue = 0.0f;
			mCountOfNextUpdatesToIgnore = 0;
		}
		
		inline LLSD asLLSD() const
		{
			LLSD data;
			data["mean"] = getMean();
			data["std_dev"] = getStdDev();
			data["count"] = (S32)mCount;
			data["min"] = getMinValue();
			data["max"] = getMaxValue();
			return data;
		}
	};

	StatsAccumulator mAgentPositionSnaps;

	// Phase tracking (originally put in for avatar rezzing), tracking
	// progress of active/completed phases for activities like outfit changing.
	typedef std::map<std::string,LLFrameTimer>	phase_map_t;
	typedef std::map<std::string,StatsAccumulator>	phase_stats_t;
	class PhaseMap
	{
	private:
		phase_map_t mPhaseMap;
		static phase_stats_t sStats;
	public:
		PhaseMap();
		LLFrameTimer& 	getPhaseTimer(const std::string& phase_name);
		void			startPhase(const std::string& phase_name);
		void			stopPhase(const std::string& phase_name);
		void			stopAllPhases();
		void			clearPhases();
		LLSD			asLLSD();
		static StatsAccumulator& getPhaseStats(const std::string& phase_name);
		static void recordPhaseStat(const std::string& phase_name, F32 value);
	};

private:
	F64	mStats[ST_COUNT];

	F64 mLastTimeDiff;  // used for time stat updates
};

static const F32 SEND_STATS_PERIOD = 300.0f;

// The following are from (older?) statistics code found in appviewer.
void update_statistics();
void send_stats();

extern LLFrameTimer gTextureTimer;
extern U32	gTotalTextureBytes;
extern U32  gTotalObjectBytes;
extern U32  gTotalTextureBytesPerBoostLevel[] ;
#endif // LL_LLVIEWERSTATS_H