/** 
 * @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,
			mObjectsDrawnStat,
			mObjectsCulledStat,
			mObjectsTestedStat,
			mObjectsComparedStat,
			mObjectsOccludedStat,
			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,

			mSimFPS,
			mSimPhysicsFPS,
			mSimAgentUPS,
			mSimScriptEPS,

			mSimFrameMsec,
			mSimNetMsec,
			mSimSimOtherMsec,
			mSimSimPhysicsMsec,

			mSimSimPhysicsStepMsec,
			mSimSimPhysicsShapeUpdateMsec,
			mSimSimPhysicsOtherMsec,
			mSimSimAIStepMsec,
			mSimSimSkippedSilhouetteSteps,
			mSimSimPctSteppedCharacters,

			mSimAgentMsec,
			mSimImagesMsec,
			mSimScriptMsec,
			mSimSpareMsec,
			mSimSleepMsec,
			mSimPumpIOMsec,

			mSimMainAgents,
			mSimChildAgents,
			mSimObjects,
			mSimActiveObjects,
			mSimActiveScripts,
			mSimPctScriptsRun,

			mSimInPPS,
			mSimOutPPS,
			mSimPendingDownloads,
			mSimPendingUploads,
			mSimPendingLocalUploads,
			mSimTotalUnackedBytes,

			mPhysicsPinnedTasks,
			mPhysicsLODTasks,
			mPhysicsMemoryAllocated,

			mSimPingStat,

			mNumImagesStat,
			mNumRawImagesStat,
			mGLTexMemStat,
			mGLBoundMemStat,
			mRawMemStat,
			mFormattedMemStat,

			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();
	~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 getData() 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,LLTimer>	phase_map_t;
	typedef std::map<std::string,StatsAccumulator>	phase_stats_t;
	class PhaseMap
	{
	private:
		phase_map_t mPhaseMap;
	public:
		PhaseMap();
		LLTimer&	 	getPhaseTimer(const std::string& phase_name);
		bool 			getPhaseValues(const std::string& phase_name, F32& elapsed, bool& completed);
		void			startPhase(const std::string& phase_name);
		void			stopPhase(const std::string& phase_name);
		void			clearPhases();
		LLSD			dumpPhases();
		phase_map_t::iterator begin() { return mPhaseMap.begin(); }
		phase_map_t::iterator end() { return mPhaseMap.end(); }
	};

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