/**
 * @file llviewborder.cpp
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 *
 * 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 "linden_common.h"

#include "llviewborder.h"

#include "llrender.h"

static const std::string LL_VIEW_BORDER_TAG = "view_border";
static LLRegisterWidget<LLViewBorder> r31(LL_VIEW_BORDER_TAG);

LLViewBorder::LLViewBorder(const std::string& name, const LLRect& rect,
						   EBevel bevel, EStyle style, S32 width)
:	LLView(name, rect, false),
	mBevel(bevel),
	mStyle(style),
	mHighlightLight(LLUI::sDefaultHighlightLight),
	mHighlightDark(LLUI::sDefaultHighlightDark),
	mShadowLight(LLUI::sDefaultShadowLight),
	mShadowDark(LLUI::sDefaultShadowDark),
	mBorderWidth(width),
	mTexture(NULL),
	mHasKeyboardFocus(false)
{
	setFollowsAll();
}

void LLViewBorder::setColors(const LLColor4& shadow_dark,
							 const LLColor4& highlight_light)
{
	mShadowDark = shadow_dark;
	mHighlightLight = highlight_light;
}

void LLViewBorder::setColorsExtended(const LLColor4& shadow_light,
									 const LLColor4& shadow_dark,
				  					 const LLColor4& highlight_light,
									 const LLColor4& highlight_dark)
{
	mShadowDark = shadow_dark;
	mShadowLight = shadow_light;
	mHighlightLight = highlight_light;
	mHighlightDark = highlight_dark;
}

void LLViewBorder::setTexture(const LLUUID& image_id)
{
	mTexture = LLUI::getUIImageByID(image_id);
}

void LLViewBorder::draw()
{
	if (STYLE_LINE == mStyle)
	{
		if (0 == mBorderWidth)
		{
			// no visible border
		}
		else if (1 == mBorderWidth)
		{
			drawOnePixelLines();
		}
		else if (2 == mBorderWidth)
		{
			drawTwoPixelLines();
		}
		else
		{
			llassert(false);  // not implemented
		}
	}

	// draw the children
	LLView::draw();
}

void LLViewBorder::drawOnePixelLines()
{
	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);

	LLColor4 top_color = mHighlightLight;
	LLColor4 bottom_color = mHighlightLight;
	switch (mBevel)
	{
		case BEVEL_OUT:
			top_color		= mHighlightLight;
			bottom_color	= mShadowDark;
			break;

		case BEVEL_IN:
			top_color		= mShadowDark;
			bottom_color	= mHighlightLight;
			break;

		case BEVEL_NONE:
			// use defaults
			break;

		default:
			llassert(0);
	}

	if (mHasKeyboardFocus)
	{
		top_color = gFocusMgr.getFocusColor();
		bottom_color = top_color;

		LLUI::setLineWidth(lerp(1.f, 3.f, gFocusMgr.getFocusFlashAmt()));
	}

	constexpr S32 left = 0;
	constexpr S32 bottom = 0;
	S32 top = getRect().getHeight();
	S32 right = getRect().getWidth();

	gGL.color4fv(top_color.mV);
	gl_line_2d(left, bottom, left, top);
	gl_line_2d(left, top, right, top);

	gGL.color4fv(bottom_color.mV);
	gl_line_2d(right, top, right, bottom);
	gl_line_2d(left, bottom, right, bottom);

	LLUI::setLineWidth(1.f);
}

void LLViewBorder::drawTwoPixelLines()
{
	gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);

	LLColor4 focus_color = gFocusMgr.getFocusColor();

	F32* top_in_color		= mShadowDark.mV;
	F32* top_out_color		= mShadowDark.mV;
	F32* bottom_in_color	= mShadowDark.mV;
	F32* bottom_out_color	= mShadowDark.mV;
	switch (mBevel)
	{
		case BEVEL_OUT:
			top_in_color		= mHighlightLight.mV;
			top_out_color		= mHighlightDark.mV;
			bottom_in_color		= mShadowLight.mV;
			bottom_out_color	= mShadowDark.mV;
			break;

		case BEVEL_IN:
			top_in_color		= mShadowDark.mV;
			top_out_color		= mShadowLight.mV;
			bottom_in_color		= mHighlightDark.mV;
			bottom_out_color	= mHighlightLight.mV;
			break;

		case BEVEL_BRIGHT:
			top_in_color		= mHighlightLight.mV;
			top_out_color		= mHighlightLight.mV;
			bottom_in_color		= mHighlightLight.mV;
			bottom_out_color	= mHighlightLight.mV;
			break;

		case BEVEL_NONE:
			// use defaults
			break;

		default:
			llassert(0);
	}

	if (mHasKeyboardFocus)
	{
		top_out_color = focus_color.mV;
		bottom_out_color = focus_color.mV;
	}

	S32 left	= 0;
	S32 top		= getRect().getHeight();
	S32 right	= getRect().getWidth();
	S32 bottom	= 0;

	// draw borders
	gGL.color3fv(top_out_color);
	gl_line_2d(left, bottom, left, top - 1);
	gl_line_2d(left, top - 1, right, top - 1);

	gGL.color3fv(top_in_color);
	gl_line_2d(left + 1, bottom + 1, left + 1, top - 2);
	gl_line_2d(left + 1, top - 2, right - 1, top - 2);

	gGL.color3fv(bottom_out_color);
	gl_line_2d(right - 1, top - 1, right - 1, bottom);
	gl_line_2d(left, bottom, right, bottom);

	gGL.color3fv(bottom_in_color);
	gl_line_2d(right - 2, top - 2, right - 2, bottom + 1);
	gl_line_2d(left + 1, bottom + 1, right - 1, bottom + 1);
}

bool LLViewBorder::getBevelFromAttribute(LLXMLNodePtr node,
										 LLViewBorder::EBevel& bevel_style)
{
	if (node->hasAttribute("bevel_style"))
	{
		std::string bevel_string;
		node->getAttributeString("bevel_style", bevel_string);
		LLStringUtil::toLower(bevel_string);

		if (bevel_string == "none")
		{
			bevel_style = LLViewBorder::BEVEL_NONE;
		}
		else if (bevel_string == "in")
		{
			bevel_style = LLViewBorder::BEVEL_IN;
		}
		else if (bevel_string == "out")
		{
			bevel_style = LLViewBorder::BEVEL_OUT;
		}
		else if (bevel_string == "bright")
		{
			bevel_style = LLViewBorder::BEVEL_BRIGHT;
		}
		return true;
	}
	return false;
}

//virtual
const std::string& LLViewBorder::getTag() const
{
	return LL_VIEW_BORDER_TAG;
}

//virtual
LLXMLNodePtr LLViewBorder::getXML(bool save_children) const
{
	LLXMLNodePtr nodep = LLView::getXML();
	nodep->setName(LL_VIEW_BORDER_TAG);
	return nodep;
}

//static
LLView* LLViewBorder::fromXML(LLXMLNodePtr node, LLView* parent,
							  LLUICtrlFactory* factory)
{
	std::string name = LL_VIEW_BORDER_TAG;
	node->getAttributeString("name", name);

	LLViewBorder::EBevel bevel_style = LLViewBorder::BEVEL_IN;
	getBevelFromAttribute(node, bevel_style);

	S32 border_thickness = 1;
	node->getAttributeS32("border_thickness", border_thickness);

	LLViewBorder* border = new LLViewBorder(name, LLRect(), bevel_style,
											LLViewBorder::STYLE_LINE,
											border_thickness);

	border->initFromXML(node, parent);

	return border;
}