/** 
 * @file llviewborder.cpp
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

#include "linden_common.h"
#include "llviewborder.h"
#include "llrender.h"
#include "llfocusmgr.h"
#include "lluictrlfactory.h"
#include "lluiimage.h"

static LLDefaultChildRegistry::Register<LLViewBorder> r("view_border");

void LLViewBorder::BevelValues::declareValues()
{
	declare("in", LLViewBorder::BEVEL_IN);
	declare("out", LLViewBorder::BEVEL_OUT);
	declare("bright", LLViewBorder::BEVEL_BRIGHT);
	declare("none", LLViewBorder::BEVEL_NONE);
}

void LLViewBorder::StyleValues::declareValues()
{
	declare("line", LLViewBorder::STYLE_LINE);
	declare("texture", LLViewBorder::STYLE_TEXTURE);
}

LLViewBorder::Params::Params()
:	bevel_style("bevel_style", BEVEL_OUT),
	render_style("border_style", STYLE_LINE),
	border_thickness("border_thickness"),
	highlight_light_color("highlight_light_color"),
	highlight_dark_color("highlight_dark_color"),
	shadow_light_color("shadow_light_color"),
	shadow_dark_color("shadow_dark_color")
{
	addSynonym(border_thickness, "thickness");
	addSynonym(render_style, "style");
}


LLViewBorder::LLViewBorder(const LLViewBorder::Params& p)
:	LLView(p),
	mBevel(p.bevel_style),
	mStyle(p.render_style),
	mHighlightLight(p.highlight_light_color()),
	mHighlightDark(p.highlight_dark_color()),
	mShadowLight(p.shadow_light_color()),
	mShadowDark(p.shadow_dark_color()),
	mBorderWidth(p.border_thickness),
	mTexture( nullptr ),
	mHasKeyboardFocus( FALSE )
{}

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
		}
	}

	LLView::draw();
}

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

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

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

	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();

	LLColor4 top_in_color;
	LLColor4 top_out_color;
	LLColor4 bottom_in_color;
	LLColor4 bottom_out_color;

	switch( mBevel )
	{
	case BEVEL_OUT:
		top_in_color		= mHighlightLight.get();
		top_out_color		= mHighlightDark.get();
		bottom_in_color		= mShadowLight.get();
		bottom_out_color	= mShadowDark.get();
		break;
	case BEVEL_IN:
		top_in_color		= mShadowDark.get();
		top_out_color		= mShadowLight.get();
		bottom_in_color		= mHighlightDark.get();
		bottom_out_color	= mHighlightLight.get();
		break;
	case BEVEL_BRIGHT:
		top_in_color		= mHighlightLight.get();
		top_out_color		= mHighlightLight.get();
		bottom_in_color		= mHighlightLight.get();
		bottom_out_color	= mHighlightLight.get();
		break;
	case BEVEL_NONE:
		top_in_color		= mShadowDark.get();
		top_out_color		= mShadowDark.get();
		bottom_in_color		= mShadowDark.get();
		bottom_out_color	= mShadowDark.get();
		// use defaults
		break;
	default:
		llassert(0);
	}

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

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

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

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

	gGL.color3fv( bottom_in_color.mV );
	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;
}

