/** 
 * @file lltoolgun.cpp
 * @brief LLToolGun class implementation
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * 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 "lltoolgun.h"

#include "llviewerwindow.h"
#include "llagent.h"
#include "llviewercontrol.h"
#include "llsky.h"
#include "llappviewer.h"
#include "llresmgr.h"
#include "llfontgl.h"
#include "llui.h"
#include "llviewertexturelist.h"
#include "llviewercamera.h"
#include "llhudmanager.h"
#include "lltoolmgr.h"
#include "lltoolgrab.h"

// Linden library includes
#include "llwindow.h"			// setMouseClipping()

LLToolGun::LLToolGun( LLToolComposite* composite )
:	LLTool( std::string("gun"), composite ),
		mIsSelected(FALSE)
{
}

void LLToolGun::handleSelect()
{
	gViewerWindow->hideCursor();
	gViewerWindow->moveCursorToCenter();
	gViewerWindow->mWindow->setMouseClipping(TRUE);
	mIsSelected = TRUE;
}

void LLToolGun::handleDeselect()
{
	gViewerWindow->moveCursorToCenter();
	gViewerWindow->showCursor();
	gViewerWindow->mWindow->setMouseClipping(FALSE);
	mIsSelected = FALSE;
}

BOOL LLToolGun::handleMouseDown(S32 x, S32 y, MASK mask)
{
	gGrabTransientTool = this;
	LLToolMgr::getInstance()->getCurrentToolset()->selectTool( LLToolGrab::getInstance() );

	return LLToolGrab::getInstance()->handleMouseDown(x, y, mask);
}

BOOL LLToolGun::handleHover(S32 x, S32 y, MASK mask) 
{
	if( gAgent.cameraMouselook() && mIsSelected )
	{
		const F32 NOMINAL_MOUSE_SENSITIVITY = 0.0025f;

		F32 mouse_sensitivity = gSavedSettings.getF32("MouseSensitivity");
		mouse_sensitivity = clamp_rescale(mouse_sensitivity, 0.f, 15.f, 0.5f, 2.75f) * NOMINAL_MOUSE_SENSITIVITY;

		// ...move the view with the mouse

		// get mouse movement delta
		S32 dx = -gViewerWindow->getCurrentMouseDX();
		S32 dy = -gViewerWindow->getCurrentMouseDY();
		
		if (dx != 0 || dy != 0)
		{
			// ...actually moved off center
			if (gSavedSettings.getBOOL("InvertMouse"))
			{
				gAgent.pitch(mouse_sensitivity * -dy);
			}
			else
			{
				gAgent.pitch(mouse_sensitivity * dy);
			}
			LLVector3 skyward = gAgent.getReferenceUpVector();
			gAgent.rotate(mouse_sensitivity * dx, skyward.mV[VX], skyward.mV[VY], skyward.mV[VZ]);

			if (gSavedSettings.getBOOL("MouseSun"))
			{
				gSky.setSunDirection(LLViewerCamera::getInstance()->getAtAxis(), LLVector3(0.f, 0.f, 0.f));
				gSky.setOverrideSun(TRUE);
				gSavedSettings.setVector3("SkySunDefaultPosition", LLViewerCamera::getInstance()->getAtAxis());
			}

			gViewerWindow->moveCursorToCenter();
			gViewerWindow->hideCursor();
		}

		lldebugst(LLERR_USER_INPUT) << "hover handled by LLToolGun (mouselook)" << llendl;
	}
	else
	{
		lldebugst(LLERR_USER_INPUT) << "hover handled by LLToolGun (not mouselook)" << llendl;
	}

	// HACK to avoid assert: error checking system makes sure that the cursor is set during every handleHover.  This is actually a no-op since the cursor is hidden.
	gViewerWindow->setCursor(UI_CURSOR_ARROW);  

	return TRUE;
}

void LLToolGun::draw()
{
	if( gSavedSettings.getBOOL("ShowCrosshairs") )
	{
		LLUIImagePtr crosshair = LLUI::getUIImage("crosshairs.tga");
		crosshair->draw(
			( gViewerWindow->getVirtualWorldViewRect().getWidth() - crosshair->getWidth() ) / 2,
			( gViewerWindow->getVirtualWorldViewRect().getHeight() - crosshair->getHeight() ) / 2);
	}
}