/** 
 * @file llstatbar.cpp
 * @brief A little map of the world with network information
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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 "linden_common.h"

#include "llstatbar.h"

#include "llmath.h"
#include "llui.h"
#include "llgl.h"
#include "llfontgl.h"

#include "llstat.h"
#include "lluictrlfactory.h"

static LLRegisterWidget<LLStatBar> r1("stat_bar");

///////////////////////////////////////////////////////////////////////////////////

LLStatBar::LLStatBar(const Params& p)
	: LLView(p),
	  mLabel(p.label),
	  mUnitLabel(p.unit_label),
	  mMinBar(p.bar_min),
	  mMaxBar(p.bar_max),
	  mStatp(LLStat::getStat(p.stat)),
	  mTickSpacing(p.tick_spacing),
	  mLabelSpacing(p.label_spacing),
	  mPrecision(p.precision),
	  mUpdatesPerSec(p.update_rate),
	  mPerSec(p.show_per_sec),
	  mDisplayBar(p.show_bar),
	  mDisplayHistory(p.show_history),
	  mDisplayMean(p.show_mean)
{
}

BOOL LLStatBar::handleMouseDown(S32 x, S32 y, MASK mask)
{
	if (mDisplayBar)
	{
		if (mDisplayHistory)
		{
			mDisplayBar = FALSE;
			mDisplayHistory = FALSE;
		}
		else
		{
			mDisplayHistory = TRUE;
		}
	}
	else
	{
		mDisplayBar = TRUE;
	}

	LLView* parent = getParent();
	parent->reshape(parent->getRect().getWidth(), parent->getRect().getHeight(), FALSE);

	return FALSE;
}

void LLStatBar::draw()
{
	if (!mStatp)
	{
//		llinfos << "No stats for statistics bar!" << llendl;
		return;
	}

	// Get the values.
	F32 current, min, max, mean;
	if (mPerSec)
	{
		current = mStatp->getCurrentPerSec();
		min = mStatp->getMinPerSec();
		max = mStatp->getMaxPerSec();
		mean = mStatp->getMeanPerSec();
	}
	else
	{
		current = mStatp->getCurrent();
		min = mStatp->getMin();
		max = mStatp->getMax();
		mean = mStatp->getMean();
	}


	if ((mUpdatesPerSec == 0.f) || (mUpdateTimer.getElapsedTimeF32() > 1.f/mUpdatesPerSec) || (mValue == 0.f))
	{
		if (mDisplayMean)
		{
			mValue = mean;
		}
		else
		{
			mValue = current;
		}
		mUpdateTimer.reset();
	}

	S32 width = getRect().getWidth() - 40;
	S32 max_width = width;
	S32 bar_top = getRect().getHeight() - 15; // 16 pixels from top.
	S32 bar_height = bar_top - 20;
	S32 tick_height = 4;
	S32 tick_width = 1;
	S32 left, top, right, bottom;

	F32 value_scale = max_width/(mMaxBar - mMinBar);

	LLFontGL::getFontMonospace()->renderUTF8(mLabel, 0, 0, getRect().getHeight(), LLColor4(1.f, 1.f, 1.f, 1.f),
											 LLFontGL::LEFT, LLFontGL::TOP);

	std::string value_format;
	std::string value_str;
	if (!mUnitLabel.empty())
	{
		value_format = llformat( "%%.%df%%s", mPrecision);
		value_str = llformat( value_format.c_str(), mValue, mUnitLabel.c_str());
	}
	else
	{
		value_format = llformat( "%%.%df", mPrecision);
		value_str = llformat( value_format.c_str(), mValue);
	}

	// Draw the value.
	LLFontGL::getFontMonospace()->renderUTF8(value_str, 0, width, getRect().getHeight(), 
											 LLColor4(1.f, 1.f, 1.f, 0.5f),
											 LLFontGL::RIGHT, LLFontGL::TOP);

	value_format = llformat( "%%.%df", mPrecision);
	if (mDisplayBar)
	{
		std::string tick_label;

		// Draw the tick marks.
		F32 tick_value;
		top = bar_top;
		bottom = bar_top - bar_height - tick_height/2;

		LLGLSUIDefault gls_ui;
		gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);

		for (tick_value = mMinBar; tick_value <= mMaxBar; tick_value += mTickSpacing)
		{
			left = llfloor((tick_value - mMinBar)*value_scale);
			right = left + tick_width;
			gl_rect_2d(left, top, right, bottom, LLColor4(1.f, 1.f, 1.f, 0.1f));
		}

		// Draw the tick labels (and big ticks).
		bottom = bar_top - bar_height - tick_height;
		for (tick_value = mMinBar; tick_value <= mMaxBar; tick_value += mLabelSpacing)
		{
			left = llfloor((tick_value - mMinBar)*value_scale);
			right = left + tick_width;
			gl_rect_2d(left, top, right, bottom, LLColor4(1.f, 1.f, 1.f, 0.25f));

			tick_label = llformat( value_format.c_str(), tick_value);
			// draw labels for the tick marks
			LLFontGL::getFontMonospace()->renderUTF8(tick_label, 0, left - 1, bar_top - bar_height - tick_height,
													 LLColor4(1.f, 1.f, 1.f, 0.5f),
													 LLFontGL::LEFT, LLFontGL::TOP);
		}

		// Now, draw the bars
		top = bar_top;
		bottom = bar_top - bar_height;

		// draw background bar.
		left = 0;
		right = width;
		gl_rect_2d(left, top, right, bottom, LLColor4(0.f, 0.f, 0.f, 0.25f));

		if (mStatp->getNumValues() == 0)
		{
			// No data, don't draw anything...
			return;
		}
		// draw min and max
		left = (S32) ((min - mMinBar) * value_scale);

		if (left < 0)
		{
			left = 0;
			llwarns << "Min:" << min << llendl;
		}

		right = (S32) ((max - mMinBar) * value_scale);
		gl_rect_2d(left, top, right, bottom, LLColor4(1.f, 0.f, 0.f, 0.25f));

		S32 num_values = mStatp->getNumValues() - 1;
		if (mDisplayHistory)
		{
			S32 i;
			for (i = 0; i < num_values; i++)
			{
				if (i == mStatp->getNextBin())
				{
					continue;
				}
				if (mPerSec)
				{
					left = (S32)((mStatp->getPrevPerSec(i) - mMinBar) * value_scale);
					right = (S32)((mStatp->getPrevPerSec(i) - mMinBar) * value_scale) + 1;
					gl_rect_2d(left, bottom+i+1, right, bottom+i, LLColor4(1.f, 0.f, 0.f, 1.f));
				}
				else
				{
					left = (S32)((mStatp->getPrev(i) - mMinBar) * value_scale);
					right = (S32)((mStatp->getPrev(i) - mMinBar) * value_scale) + 1;
					gl_rect_2d(left, bottom+i+1, right, bottom+i, LLColor4(1.f, 0.f, 0.f, 1.f));
				}
			}
		}
		else
		{
			// draw current
			left = (S32) ((current - mMinBar) * value_scale) - 1;
			right = (S32) ((current - mMinBar) * value_scale) + 1;
			gl_rect_2d(left, top, right, bottom, LLColor4(1.f, 0.f, 0.f, 1.f));
		}

		// draw mean bar
		top = bar_top + 2;
		bottom = bar_top - bar_height - 2;
		left = (S32) ((mean - mMinBar) * value_scale) - 1;
		right = (S32) ((mean - mMinBar) * value_scale) + 1;
		gl_rect_2d(left, top, right, bottom, LLColor4(0.f, 1.f, 0.f, 1.f));
	}
	
	LLView::draw();
}

void LLStatBar::setRange(F32 bar_min, F32 bar_max, F32 tick_spacing, F32 label_spacing)
{
	mMinBar = bar_min;
	mMaxBar = bar_max;
	mTickSpacing = tick_spacing;
	mLabelSpacing = label_spacing;
}

LLRect LLStatBar::getRequiredRect()
{
	LLRect rect;

	if (mDisplayBar)
	{
		if (mDisplayHistory)
		{
			rect.mTop = 67;
		}
		else
		{
			rect.mTop = 40;
		}
	}
	else
	{
		rect.mTop = 14;
	}
	return rect;
}