/** 
 * @file llviewerstats.cpp
 * @brief LLViewerStats class implementation
 *
 * $LicenseInfo:firstyear=2002&license=viewergpl$
 * 
 * Copyright (c) 2002-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llviewerstats.h"
#include "llviewerthrottle.h"

#include "message.h"
#include "lltimer.h"

LLViewerStats *gViewerStats = NULL;

extern U32 gFrameCount;
extern LLTimer gRenderStartTime;

class StatAttributes
{
public:
	StatAttributes(const char *name,
				   const BOOL enabled,
				   const BOOL is_timer)
		: mName(name),
		  mEnabled(enabled),
		  mIsTimer(is_timer)
	{
	}
	
	const char *mName;
	const BOOL mEnabled;
	const BOOL mIsTimer;
};

const StatAttributes STAT_INFO[LLViewerStats::ST_COUNT] =
{
	// ST_VERSION
	StatAttributes("Version", TRUE, FALSE),
	// ST_AVATAR_EDIT_SECONDS
	StatAttributes("Seconds in Edit Appearence", FALSE, TRUE),
	// ST_TOOLBOX_SECONDS
	StatAttributes("Seconds using Toolbox", FALSE, TRUE),
	// ST_CHAT_COUNT
	StatAttributes("Chat messages sent", FALSE, FALSE),
	// ST_IM_COUNT
	StatAttributes("IMs sent", FALSE, FALSE),
	// ST_FULLSCREEN_BOOL
	StatAttributes("Fullscreen mode", FALSE, FALSE),
	// ST_RELEASE_COUNT
	StatAttributes("Object release count", FALSE, FALSE),
	// ST_CREATE_COUNT
	StatAttributes("Object create count", FALSE, FALSE),
	// ST_REZ_COUNT
	StatAttributes("Object rez count", FALSE, FALSE),
	// ST_FPS_10_SECONDS
	StatAttributes("Seconds below 10 FPS", FALSE, TRUE),
	// ST_FPS_2_SECONDS
	StatAttributes("Seconds below 2 FPS", FALSE, TRUE),
	// ST_MOUSELOOK_SECONDS
	StatAttributes("Seconds in Mouselook", FALSE, TRUE),
	// ST_FLY_COUNT
	StatAttributes("Fly count", FALSE, FALSE),
	// ST_TELEPORT_COUNT
	StatAttributes("Teleport count", FALSE, FALSE),
	// ST_OBJECT_DELETE_COUNT
	StatAttributes("Objects deleted", FALSE, FALSE),
	// ST_SNAPSHOT_COUNT
	StatAttributes("Snapshots taken", FALSE, FALSE),
	// ST_UPLOAD_SOUND_COUNT
	StatAttributes("Sounds uploaded", FALSE, FALSE),
	// ST_UPLOAD_TEXTURE_COUNT
	StatAttributes("Textures uploaded", FALSE, FALSE),
	// ST_EDIT_TEXTURE_COUNT
	StatAttributes("Changes to textures on objects", FALSE, FALSE),
	// ST_KILLED_COUNT
	StatAttributes("Number of times killed", FALSE, FALSE),
	// ST_FRAMETIME_JITTER
	StatAttributes("Average delta between sucessive frame times", FALSE, FALSE),
	// ST_FRAMETIME_SLEW
	StatAttributes("Average delta between frame time and mean", FALSE, FALSE),
	// ST_INVENTORY_TOO_LONG
	StatAttributes("Inventory took too long to load", FALSE, FALSE),
	// ST_WEARABLES_TOO_LONG
	StatAttributes("Wearables took too long to load", FALSE, FALSE),
	// ST_LOGIN_SECONDS
	StatAttributes("Time between LoginRequest and LoginReply", FALSE, FALSE),
	// ST_LOGIN_TIMEOUT_COUNT
	StatAttributes("Number of login attempts that timed out", FALSE, FALSE),
	// ST_HAS_BAD_TIMER
	StatAttributes("Known bad timer if != 0.0", FALSE, FALSE),
	// ST_DOWNLOAD_FAILED
	StatAttributes("Number of times LLAssetStorage::getAssetData() has failed", FALSE, FALSE),
	// ST_LSL_SAVE_COUNT
	StatAttributes("Number of times user has saved a script", FALSE, FALSE),
	// ST_UPLOAD_ANIM_COUNT
	StatAttributes("Animations uploaded", FALSE, FALSE),
	// ST_FPS_8_SECONDS
	StatAttributes("Seconds below 8 FPS", FALSE, TRUE),
	// ST_SIM_FPS_20_SECONDS
	StatAttributes("Seconds with sim FPS below 20", FALSE, TRUE),
	// ST_PHYS_FPS_20_SECONDS
	StatAttributes("Seconds with physics FPS below 20", FALSE, TRUE),
	// ST_LOSS_05_SECONDS
	StatAttributes("Seconds with packet loss > 5%", FALSE, TRUE),
	// ST_FPS_DROP_50_RATIO
	StatAttributes("Ratio of frames 2x longer than previous", FALSE, FALSE),
	// ST_ENABLE_VBO
	StatAttributes("Vertex Buffers Enabled", TRUE, FALSE),
	// ST_DELTA_BANDWIDTH
	StatAttributes("Increase/Decrease in bandwidth based on packet loss", FALSE, FALSE),
	// ST_MAX_BANDWIDTH
	StatAttributes("Max bandwidth setting", FALSE, FALSE),
	// ST_LIGHTING_DETAIL
	StatAttributes("Lighting Detail", FALSE, FALSE),
	// ST_VISIBLE_AVATARS
	StatAttributes("Visible Avatars", FALSE, FALSE),
	// ST_SHADER_OJECTS
	StatAttributes("Object Shaders", FALSE, FALSE),
	// ST_SHADER_ENVIRONMENT
	StatAttributes("Environment Shaders", FALSE, FALSE),
	// ST_VISIBLE_DRAW_DIST
	StatAttributes("Draw Distance", FALSE, FALSE),
	// ST_VISIBLE_CHAT_BUBBLES
	StatAttributes("Chat Bubbles Enabled", FALSE, FALSE),
	// ST_SHADER_AVATAR
	StatAttributes("Avatar Shaders", FALSE, FALSE),
	// ST_FRAME_SECS
	StatAttributes("FRAME_SECS", FALSE, FALSE),
	// ST_UPDATE_SECS
	StatAttributes("UPDATE_SECS", FALSE, FALSE),
	// ST_NETWORK_SECS
	StatAttributes("NETWORK_SECS", FALSE, FALSE),
	// ST_IMAGE_SECS
	StatAttributes("IMAGE_SECS", FALSE, FALSE),
	// ST_REBUILD_SECS
	StatAttributes("REBUILD_SECS", FALSE, FALSE),
	// ST_RENDER_SECS
	StatAttributes("RENDER_SECS", FALSE, FALSE),
	// ST_CROSSING_AVG
	StatAttributes("CROSSING_AVG", FALSE, FALSE),
	// ST_CROSSING_MAX
	StatAttributes("CROSSING_MAX", FALSE, FALSE),
	// ST_LIBXUL_WIDGET_USED
	StatAttributes("LibXUL Widget used", FALSE, FALSE),
	// ST_WINDOW_WIDTH
	StatAttributes("Window width", FALSE, FALSE),
	// ST_WINDOW_HEIGHT
	StatAttributes("Window height", FALSE, FALSE),
	// ST_TEX_BAKES
	StatAttributes("Texture Bakes", FALSE, FALSE),
	// ST_TEX_REBAKES
	StatAttributes("Texture Rebakes", FALSE, FALSE)
};

LLViewerStats::LLViewerStats()
	: mPacketsLostPercentStat(64),
	  mLastTimeDiff(0.0)
{
	for (S32 i = 0; i < ST_COUNT; i++)
	{
		mStats[i] = 0.0;
	}
	
	if (LLTimer::knownBadTimer())
	{
		mStats[ST_HAS_BAD_TIMER] = 1.0;
	}	
}

LLViewerStats::~LLViewerStats()
{
}

void LLViewerStats::resetStats()
{
	gViewerStats->mKBitStat.reset();
	gViewerStats->mLayersKBitStat.reset();
	gViewerStats->mObjectKBitStat.reset();
	gViewerStats->mTextureKBitStat.reset();
	gViewerStats->mVFSPendingOperations.reset();
	gViewerStats->mAssetKBitStat.reset();
	gViewerStats->mPacketsInStat.reset();
	gViewerStats->mPacketsLostStat.reset();
	gViewerStats->mPacketsOutStat.reset();
	gViewerStats->mFPSStat.reset();
	gViewerStats->mTexturePacketsStat.reset();
}


F64 LLViewerStats::getStat(EStatType type) const
{
	return mStats[type];
}

F64 LLViewerStats::setStat(EStatType type, F64 value)
{
	mStats[type] = value;
	return mStats[type];
}

F64 LLViewerStats::incStat(EStatType type, F64 value)
{
	mStats[type] += value;
	return mStats[type];
}

void LLViewerStats::updateFrameStats(const F64 time_diff)
{
	if (mPacketsLostPercentStat.getCurrent() > 5.0)
	{
		incStat(LLViewerStats::ST_LOSS_05_SECONDS, time_diff);
	}
	
	if (mSimFPS.getCurrent() < 20.f && mSimFPS.getCurrent() > 0.f)
	{
		incStat(LLViewerStats::ST_SIM_FPS_20_SECONDS, time_diff);
	}
	
	if (mSimPhysicsFPS.getCurrent() < 20.f && mSimPhysicsFPS.getCurrent() > 0.f)
	{
		incStat(LLViewerStats::ST_PHYS_FPS_20_SECONDS, time_diff);
	}
		
	if (time_diff >= 0.5)
	{
		incStat(LLViewerStats::ST_FPS_2_SECONDS, time_diff);
	}
	if (time_diff >= 0.125)
	{
		incStat(LLViewerStats::ST_FPS_8_SECONDS, time_diff);
	}
	if (time_diff >= 0.1)
	{
		incStat(LLViewerStats::ST_FPS_10_SECONDS, time_diff);
	}

	if (gFrameCount && mLastTimeDiff > 0.0)
	{
		// new "stutter" meter
		setStat(LLViewerStats::ST_FPS_DROP_50_RATIO,
				(getStat(LLViewerStats::ST_FPS_DROP_50_RATIO) * (F64)(gFrameCount - 1) + 
				 (time_diff >= 2.0 * mLastTimeDiff ? 1.0 : 0.0)) / gFrameCount);
			

		// old stats that were never really used
		setStat(LLViewerStats::ST_FRAMETIME_JITTER,
				(getStat(LLViewerStats::ST_FRAMETIME_JITTER) * (gFrameCount - 1) + 
				 fabs(mLastTimeDiff - time_diff) / mLastTimeDiff) / gFrameCount);
			
		F32 average_frametime = gRenderStartTime.getElapsedTimeF32() / (F32)gFrameCount;
		setStat(LLViewerStats::ST_FRAMETIME_SLEW,
				(getStat(LLViewerStats::ST_FRAMETIME_SLEW) * (gFrameCount - 1) + 
				 fabs(average_frametime - time_diff) / average_frametime) / gFrameCount);

		F32 max_bandwidth = gViewerThrottle.getMaxBandwidth();
		F32 delta_bandwidth = gViewerThrottle.getCurrentBandwidth() - max_bandwidth;
		setStat(LLViewerStats::ST_DELTA_BANDWIDTH, delta_bandwidth / 1024.f);

		setStat(LLViewerStats::ST_MAX_BANDWIDTH, max_bandwidth / 1024.f);
		
	}
	
	mLastTimeDiff = time_diff;

}

void LLViewerStats::addToMessage(LLSD &body) const
{
	LLSD &misc = body["misc"];
	
	for (S32 i = 0; i < ST_COUNT; i++)
	{
		if (STAT_INFO[i].mEnabled)
		{
			// TODO: send timer value so dataserver can normalize
			misc[STAT_INFO[i].mName] = mStats[i];
			llinfos << "STAT: " << STAT_INFO[i].mName << ": " << mStats[i]
					<< llendl;
		}
	}
}

// static
const char *LLViewerStats::statTypeToText(EStatType type)
{
	if (type >= 0 && type < ST_COUNT)
	{
		return STAT_INFO[type].mName;
	}
	else
	{
		return "Unknown statistic";
	}
}