/** 
 * @file llscrollingpanelparam.cpp
 * @brief UI panel for a list of visual param panels
 *
 * $LicenseInfo:firstyear=2009&license=viewergpl$
 * 
 * Copyright (c) 2009-2009, 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 "llscrollingpanelparam.h"
#include "llviewerjointmesh.h"
#include "llviewervisualparam.h"
#include "llwearable.h"
#include "llviewervisualparam.h"
#include "lltoolmorph.h"
#include "lltrans.h"
#include "llbutton.h"
#include "llsliderctrl.h"
#include "llagent.h"
#include "llvoavatarself.h"

// Constants for LLPanelVisualParam
const F32 LLScrollingPanelParam::PARAM_STEP_TIME_THRESHOLD = 0.25f;

const S32 LLScrollingPanelParam::BTN_BORDER = 2;
const S32 LLScrollingPanelParam::PARAM_HINT_WIDTH = 128;
const S32 LLScrollingPanelParam::PARAM_HINT_HEIGHT = 128;
const S32 LLScrollingPanelParam::PARAM_HINT_LABEL_HEIGHT = 16;
const S32 LLScrollingPanelParam::PARAM_PANEL_WIDTH = 2 * (3* BTN_BORDER + PARAM_HINT_WIDTH +  LLPANEL_BORDER_WIDTH);
const S32 LLScrollingPanelParam::PARAM_PANEL_HEIGHT = 2 * BTN_BORDER + PARAM_HINT_HEIGHT + PARAM_HINT_LABEL_HEIGHT + 4 * LLPANEL_BORDER_WIDTH; 

// LLScrollingPanelParam
//static
S32 LLScrollingPanelParam::sUpdateDelayFrames = 0;

LLScrollingPanelParam::LLScrollingPanelParam( const LLPanel::Params& panel_params,
											  LLViewerJointMesh* mesh, LLViewerVisualParam* param, BOOL allow_modify, LLWearable* wearable )
	: LLScrollingPanel( panel_params ),
	  mParam(param),
	  mAllowModify(allow_modify),
	  mWearable(wearable)
{
	LLUICtrlFactory::getInstance()->buildPanel(this, "panel_scrolling_param.xml");

	static LLUICachedControl<S32> slider_ctrl_height ("UISliderctrlHeight", 0);
	S32 pos_x = 2 * LLPANEL_BORDER_WIDTH;
	S32 pos_y = 3 * LLPANEL_BORDER_WIDTH + slider_ctrl_height;
	F32 min_weight = param->getMinWeight();
	F32 max_weight = param->getMaxWeight();

	mHintMin = new LLVisualParamHint( pos_x, pos_y, PARAM_HINT_WIDTH, PARAM_HINT_HEIGHT, mesh, (LLViewerVisualParam*) wearable->getVisualParam(param->getID()),  min_weight);
	pos_x += PARAM_HINT_WIDTH + 3 * BTN_BORDER;
	mHintMax = new LLVisualParamHint( pos_x, pos_y, PARAM_HINT_WIDTH, PARAM_HINT_HEIGHT, mesh, (LLViewerVisualParam*) wearable->getVisualParam(param->getID()), max_weight );
	
	mHintMin->setAllowsUpdates( FALSE );
	mHintMax->setAllowsUpdates( FALSE );
	childSetValue("param slider", weightToPercent(param->getWeight()));

	std::string display_name = LLTrans::getString(param->getDisplayName());
	childSetLabelArg("param slider", "[DESC]", display_name);
	childSetEnabled("param slider", mAllowModify);
	childSetCommitCallback("param slider", LLScrollingPanelParam::onSliderMoved, this);

	std::string min_name = LLTrans::getString(param->getMinDisplayName());
	std::string max_name = LLTrans::getString(param->getMaxDisplayName());
	childSetValue("min param text", min_name);
	childSetValue("max param text", max_name);

	LLButton* less = getChild<LLButton>("less");
	if (less)
	{
		less->setMouseDownCallback( LLScrollingPanelParam::onHintMinMouseDown, this );
		less->setMouseUpCallback( LLScrollingPanelParam::onHintMinMouseUp, this );
		less->setHeldDownCallback( LLScrollingPanelParam::onHintMinHeldDown, this );
		less->setHeldDownDelay( PARAM_STEP_TIME_THRESHOLD );
	}

	LLButton* more = getChild<LLButton>("more");
	if (more)
	{
		more->setMouseDownCallback( LLScrollingPanelParam::onHintMaxMouseDown, this );
		more->setMouseUpCallback( LLScrollingPanelParam::onHintMaxMouseUp, this );
		more->setHeldDownCallback( LLScrollingPanelParam::onHintMaxHeldDown, this );
		more->setHeldDownDelay( PARAM_STEP_TIME_THRESHOLD );
	}

	setVisible(FALSE);
	setBorderVisible( FALSE );
}

LLScrollingPanelParam::~LLScrollingPanelParam()
{
}
void LLScrollingPanelParam::updatePanel(BOOL allow_modify)
{
	LLViewerVisualParam* param = mHintMin->getVisualParam();

	if (!mWearable)
	{
		// not editing a wearable just now, no update necessary
		return;
	}
	F32 current_weight = mWearable->getVisualParamWeight( param->getID() );
	childSetValue("param slider", weightToPercent( current_weight ) );
	mHintMin->requestUpdate( sUpdateDelayFrames++ );
	mHintMax->requestUpdate( sUpdateDelayFrames++ );

	mAllowModify = allow_modify;
	childSetEnabled("param slider", mAllowModify);
	childSetEnabled("less", mAllowModify);
	childSetEnabled("more", mAllowModify);
}

void LLScrollingPanelParam::setVisible( BOOL visible )
{
	if( getVisible() != visible )
	{
		LLPanel::setVisible( visible );
		mHintMin->setAllowsUpdates( visible );
		mHintMax->setAllowsUpdates( visible );

		if( visible )
		{
			mHintMin->setUpdateDelayFrames( sUpdateDelayFrames++ );
			mHintMax->setUpdateDelayFrames( sUpdateDelayFrames++ );
		}
	}
}

void LLScrollingPanelParam::draw()
{
	if( !mWearable )
	{
		return;
	}
	
	childSetVisible("less", mHintMin->getVisible());
	childSetVisible("more", mHintMax->getVisible());

	// Draw all the children except for the labels
	childSetVisible( "min param text", FALSE );
	childSetVisible( "max param text", FALSE );
	LLPanel::draw();

	// Draw the hints over the "less" and "more" buttons.
	gGL.pushUIMatrix();
	{
		const LLRect& r = mHintMin->getRect();
		F32 left = (F32)(r.mLeft + BTN_BORDER);
		F32 bot  = (F32)(r.mBottom + BTN_BORDER);
		gGL.translateUI(left, bot, 0.f);
		mHintMin->draw();
	}
	gGL.popUIMatrix();

	gGL.pushUIMatrix();
	{
		const LLRect& r = mHintMax->getRect();
		F32 left = (F32)(r.mLeft + BTN_BORDER);
		F32 bot  = (F32)(r.mBottom + BTN_BORDER);
		gGL.translateUI(left, bot, 0.f);
		mHintMax->draw();
	}
	gGL.popUIMatrix();


	// Draw labels on top of the buttons
	childSetVisible( "min param text", TRUE );
	drawChild(getChild<LLView>("min param text"), BTN_BORDER, BTN_BORDER);

	childSetVisible( "max param text", TRUE );
	drawChild(getChild<LLView>("max param text"), BTN_BORDER, BTN_BORDER);
}

// static
void LLScrollingPanelParam::onSliderMoved(LLUICtrl* ctrl, void* userdata)
{
	LLSliderCtrl* slider = (LLSliderCtrl*) ctrl;
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;
	LLViewerVisualParam* param = self->mParam;
	
	F32 current_weight = self->mWearable->getVisualParamWeight( param->getID() );
	F32 new_weight = self->percentToWeight( (F32)slider->getValue().asReal() );
	if (current_weight != new_weight )
	{
		self->mWearable->setVisualParamWeight( param->getID(), new_weight, FALSE );
		gAgent.getAvatarObject()->updateVisualParams();
	}
}

// static
void LLScrollingPanelParam::onSliderMouseDown(LLUICtrl* ctrl, void* userdata)
{
}

// static
void LLScrollingPanelParam::onSliderMouseUp(LLUICtrl* ctrl, void* userdata)
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;

	LLVisualParamHint::requestHintUpdates( self->mHintMin, self->mHintMax );
}

// static
void LLScrollingPanelParam::onHintMinMouseDown( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;
	self->onHintMouseDown( self->mHintMin );
}

// static
void LLScrollingPanelParam::onHintMaxMouseDown( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;
	self->onHintMouseDown( self->mHintMax );
}


void LLScrollingPanelParam::onHintMouseDown( LLVisualParamHint* hint )
{
	// morph towards this result
	F32 current_weight = mWearable->getVisualParamWeight( hint->getVisualParam()->getID() );

	// if we have maxed out on this morph, we shouldn't be able to click it
	if( hint->getVisualParamWeight() != current_weight )
	{
		mMouseDownTimer.reset();
		mLastHeldTime = 0.f;
	}
}

// static
void LLScrollingPanelParam::onHintMinHeldDown( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;
	self->onHintHeldDown( self->mHintMin );
}

// static
void LLScrollingPanelParam::onHintMaxHeldDown( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;
	self->onHintHeldDown( self->mHintMax );
}
	
void LLScrollingPanelParam::onHintHeldDown( LLVisualParamHint* hint )
{
	F32 current_weight = mWearable->getVisualParamWeight( hint->getVisualParam()->getID() );

	if (current_weight != hint->getVisualParamWeight() )
	{
		const F32 FULL_BLEND_TIME = 2.f;
		F32 elapsed_time = mMouseDownTimer.getElapsedTimeF32() - mLastHeldTime;
		mLastHeldTime += elapsed_time;

		F32 new_weight;
		if (current_weight > hint->getVisualParamWeight() )
		{
			new_weight = current_weight - (elapsed_time / FULL_BLEND_TIME);
		}
		else
		{
			new_weight = current_weight + (elapsed_time / FULL_BLEND_TIME);
		}

		// Make sure we're not taking the slider out of bounds
		// (this is where some simple UI limits are stored)
		F32 new_percent = weightToPercent(new_weight);
		LLSliderCtrl* slider = getChild<LLSliderCtrl>("param slider");
		if (slider)
		{
			if (slider->getMinValue() < new_percent
				&& new_percent < slider->getMaxValue())
			{
				mWearable->setVisualParamWeight( hint->getVisualParam()->getID(), new_weight, FALSE);
				gAgent.getAvatarObject()->updateVisualParams();

				slider->setValue( weightToPercent( new_weight ) );
			}
		}
	}
}

// static
void LLScrollingPanelParam::onHintMinMouseUp( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;

	F32 elapsed_time = self->mMouseDownTimer.getElapsedTimeF32();

	LLVisualParamHint* hint = self->mHintMin;

	if (elapsed_time < PARAM_STEP_TIME_THRESHOLD)
	{
		// step in direction
		F32 current_weight = self->mWearable->getVisualParamWeight( hint->getVisualParam()->getID() );
		F32 range = self->mHintMax->getVisualParamWeight() - self->mHintMin->getVisualParamWeight();
		// step a fraction in the negative directiona
		F32 new_weight = current_weight - (range / 10.f);
		F32 new_percent = self->weightToPercent(new_weight);
		LLSliderCtrl* slider = self->getChild<LLSliderCtrl>("param slider");
		if (slider)
		{
			if (slider->getMinValue() < new_percent
				&& new_percent < slider->getMaxValue())
			{
				self->mWearable->setVisualParamWeight(hint->getVisualParam()->getID(), new_weight, FALSE);
				slider->setValue( self->weightToPercent( new_weight ) );
			}
		}
	}

	LLVisualParamHint::requestHintUpdates( self->mHintMin, self->mHintMax );
}

void LLScrollingPanelParam::onHintMaxMouseUp( void* userdata )
{
	LLScrollingPanelParam* self = (LLScrollingPanelParam*) userdata;

	F32 elapsed_time = self->mMouseDownTimer.getElapsedTimeF32();

	LLVOAvatarSelf* avatarp = gAgent.getAvatarObject();
	if (avatarp)
	{
		LLVisualParamHint* hint = self->mHintMax;

		if (elapsed_time < PARAM_STEP_TIME_THRESHOLD)
		{
			// step in direction
			F32 current_weight = self->mWearable->getVisualParamWeight( hint->getVisualParam()->getID() );
			F32 range = self->mHintMax->getVisualParamWeight() - self->mHintMin->getVisualParamWeight();
			// step a fraction in the negative direction
			F32 new_weight = current_weight + (range / 10.f);
			F32 new_percent = self->weightToPercent(new_weight);
			LLSliderCtrl* slider = self->getChild<LLSliderCtrl>("param slider");
			if (slider)
			{
				if (slider->getMinValue() < new_percent
					&& new_percent < slider->getMaxValue())
				{
					self->mWearable->setVisualParamWeight(hint->getVisualParam()->getID(), new_weight, FALSE);
					slider->setValue( self->weightToPercent( new_weight ) );
				}
			}
		}
	}

	LLVisualParamHint::requestHintUpdates( self->mHintMin, self->mHintMax );
}


F32 LLScrollingPanelParam::weightToPercent( F32 weight )
{
	LLViewerVisualParam* param = mParam;
	return (weight - param->getMinWeight()) /  (param->getMaxWeight() - param->getMinWeight()) * 100.f;
}

F32 LLScrollingPanelParam::percentToWeight( F32 percent )
{
	LLViewerVisualParam* param = mParam;
	return percent / 100.f * (param->getMaxWeight() - param->getMinWeight()) + param->getMinWeight();
}