/** 
 * @file llviewerim_peningtats.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 "llstatenums.h"
#include "lltextureinfo.h"
#include "lltracerecording.h"
#include "lltrace.h"

namespace LLStatViewer
{

struct SimMeasurementSampler : public LLInstanceTracker<SimMeasurementSampler, ESimStatID>
{
	SimMeasurementSampler(ESimStatID id)
	:	LLInstanceTracker<SimMeasurementSampler, ESimStatID>(id)
	{}
	virtual ~SimMeasurementSampler() {}

	virtual void sample(F64 value) = 0;
};

template<typename T = F64>
struct SimMeasurement : public LLTrace::SampleStatHandle<T>, public SimMeasurementSampler
{
	SimMeasurement(const char* name, const char* description, ESimStatID stat_id)
	:	LLTrace::SampleStatHandle<T>(name, description),
		SimMeasurementSampler(stat_id)	
	{}

	using SimMeasurementSampler::getInstance;

	/*virtual*/ void sample(F64 value)
	{
		LLTrace::sample(*this, value);
	}
};

template<typename T, typename VALUE_T>
void sample(SimMeasurement<T>& measurement, VALUE_T value)
{
	LLTrace::sample(measurement, value);
}

extern LLTrace::CountStatHandle<>			FPS,
											PACKETS_IN,
											PACKETS_LOST,
											PACKETS_OUT,
											TEXTURE_PACKETS,
											TRIANGLES_DRAWN,
											CHAT_COUNT,
											IM_COUNT,
											OBJECT_CREATE,
											OBJECT_REZ,
											LOGIN_TIMEOUTS,
											LSL_SAVES,
											ANIMATION_UPLOADS,
											FLY,
											TELEPORT,
											DELETE_OBJECT,
											SNAPSHOT,
											UPLOAD_SOUND,
											UPLOAD_TEXTURE,
											EDIT_TEXTURE,
											KILLED,
											FRAMETIME_DOUBLED,
											TEX_BAKES,
											TEX_REBAKES,
											NUM_NEW_OBJECTS;


extern LLTrace::CountStatHandle<LLTrace::Kibibits>	KBIT,
											LAYERS_KBIT,
											OBJECT_KBIT,
											ASSET_KBIT,
											TEXTURE_KBIT,
											ACTUAL_IN_KBIT,
											ACTUAL_OUT_KBIT;

extern LLTrace::CountStatHandle<LLTrace::Seconds>		SIM_20_FPS_TIME,
														SIM_PHYSICS_20_FPS_TIME,
														LOSS_5_PERCENT_TIME;

extern SimMeasurement<>						SIM_TIME_DILATION,
											SIM_FPS,
											SIM_PHYSICS_FPS,
											SIM_AGENT_UPS,
											SIM_SCRIPT_EPS,
											SIM_SKIPPED_SILHOUETTE,
											SIM_SKIPPED_CHARACTERS_PERCENTAGE,
											SIM_MAIN_AGENTS,
											SIM_CHILD_AGENTS,
											SIM_OBJECTS,
											SIM_ACTIVE_OBJECTS,
											SIM_ACTIVE_SCRIPTS,
											SIM_PERCENTAGE_SCRIPTS_RUN,
											SIM_IN_PACKETS_PER_SEC,
											SIM_OUT_PACKETS_PER_SEC,
											SIM_PENDING_DOWNLOADS,
											SIM_PENDING_UPLOADS,
											SIM_PENDING_LOCAL_UPLOADS,
											SIM_PHYSICS_PINNED_TASKS,
											SIM_PHYSICS_LOD_TASKS;

extern LLTrace::SampleStatHandle<>		FPS_SAMPLE,
										NUM_IMAGES,
										NUM_RAW_IMAGES,
										NUM_OBJECTS,
										NUM_ACTIVE_OBJECTS,
										NUM_SIZE_CULLED,
										NUM_VIS_CULLED,
										ENABLE_VBO,
										LIGHTING_DETAIL,
										VISIBLE_AVATARS,
										SHADER_OBJECTS,
										DRAW_DISTANCE,
										PENDING_VFS_OPERATIONS,
										PACKETS_LOST_PERCENT,
										WINDOW_WIDTH,
										WINDOW_HEIGHT;

extern LLTrace::SampleStatHandle<LLTrace::Bytes>	DELTA_BANDWIDTH,
													MAX_BANDWIDTH,
													GL_TEX_MEM,
													GL_BOUND_MEM,
													RAW_MEM,
													FORMATTED_MEM;

extern SimMeasurement<LLTrace::Milliseconds>	SIM_FRAME_TIME,
												SIM_NET_TIME,
												SIM_OTHER_TIME,
												SIM_PHYSICS_TIME,
												SIM_PHYSICS_STEP_TIME,
												SIM_PHYSICS_SHAPE_UPDATE_TIME,
												SIM_PHYSICS_OTHER_TIME,
												SIM_AI_TIME,
												SIM_AGENTS_TIME,
												SIM_IMAGES_TIME,
												SIM_SCRIPTS_TIME,
												SIM_SPARE_TIME,
												SIM_SLEEP_TIME,
												SIM_PUMP_IO_TIME;

extern SimMeasurement<LLTrace::Bytes>			SIM_UNACKED_BYTES,
												SIM_PHYSICS_MEM;


extern LLTrace::SampleStatHandle<LLTrace::Milliseconds>	FRAMETIME_JITTER,
														FRAMETIME_SLEW,
														SIM_PING;

extern LLTrace::EventStatHandle<LLTrace::Meters> AGENT_POSITION_SNAP;

extern LLTrace::EventStatHandle<>	LOADING_WEARABLES_LONG_DELAY;

extern LLTrace::EventStatHandle<LLTrace::Milliseconds>	REGION_CROSSING_TIME,
														FRAME_STACKTIME,
														UPDATE_STACKTIME,
														NETWORK_STACKTIME,
														IMAGE_STACKTIME,
														REBUILD_STACKTIME,
														RENDER_STACKTIME;

extern LLTrace::EventStatHandle<LLTrace::Seconds>	AVATAR_EDIT_TIME,
													TOOLBOX_TIME,
													MOUSELOOK_TIME,
													FPS_10_TIME,
													FPS_8_TIME,
													FPS_2_TIME;

}

class LLViewerStats : public LLSingleton<LLViewerStats>
{
public:
	void resetStats();

public:

	LLViewerStats();
	~LLViewerStats();

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

	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;
		}
	};

	// 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);
		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			stopAllPhases();
		void			clearPhases();
		LLSD			asLLSD();
		static StatsAccumulator& getPhaseStats(const std::string& phase_name);
		static void recordPhaseStat(const std::string& phase_name, F32 value);
		phase_map_t::iterator begin() { return mPhaseMap.begin(); }
		phase_map_t::iterator end() { return mPhaseMap.end(); }
	};

	LLTrace::Recording& getRecording() { return mRecording; }
	const LLTrace::Recording& getRecording() const { return mRecording; }

private:
	LLTrace::Recording				mRecording;

	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 LLUnit<LLUnits::Bytes, U32>	gTotalTextureData;
extern LLUnit<LLUnits::Bytes, U32>  gTotalObjectData;
extern LLUnit<LLUnits::Bytes, U32>  gTotalTextureBytesPerBoostLevel[] ;
#endif // LL_LLVIEWERSTATS_H