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

#include "lltoolgun.h"

#include "llviewerwindow.h"
#include "llagent.h"
#include "llagentcamera.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"
#include "lluiimage.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->getWindow()->setMouseClipping(true);
    mIsSelected = true;
}

void LLToolGun::handleDeselect()
{
    gViewerWindow->moveCursorToCenter();
    gViewerWindow->showCursor();
    gViewerWindow->getWindow()->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( gAgentCamera.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"))
            {
                LLVector3 sunpos = LLViewerCamera::getInstance()->getAtAxis();
                gSky.setSunDirectionCFR(sunpos);
                gSavedSettings.setVector3("SkySunDefaultPosition", LLViewerCamera::getInstance()->getAtAxis());
            }

            if (gSavedSettings.getBOOL("MouseMoon"))
            {
                LLVector3 moonpos = LLViewerCamera::getInstance()->getAtAxis();
                gSky.setMoonDirectionCFR(moonpos);
                gSavedSettings.setVector3("SkyMoonDefaultPosition", LLViewerCamera::getInstance()->getAtAxis());
            }

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

        LL_DEBUGS("UserInput") << "hover handled by LLToolGun (mouselook)" << LL_ENDL;
    }
    else
    {
        LL_DEBUGS("UserInput") << "hover handled by LLToolGun (not mouselook)" << LL_ENDL;
    }

    // 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->getWorldViewRectScaled().getWidth() - crosshair->getWidth() ) / 2,
            ( gViewerWindow->getWorldViewRectScaled().getHeight() - crosshair->getHeight() ) / 2);
    }
}