/**
 * @file lltoolface.cpp
 * @brief A tool to manipulate faces
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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"

// File includes
#include "lltoolface.h"

// Library includes
#include "llfloaterreg.h"
#include "v3math.h"

// Viewer includes
#include "llviewercontrol.h"
#include "llselectmgr.h"
#include "llviewerobject.h"
#include "llviewerwindow.h"
#include "llfloatertools.h"

//
// Member functions
//

LLToolFace::LLToolFace()
:   LLTool(std::string("Texture"))
{ }


LLToolFace::~LLToolFace()
{ }


bool LLToolFace::handleDoubleClick(S32 x, S32 y, MASK mask)
{
    if (!LLSelectMgr::getInstance()->getSelection()->isEmpty())
    {
        // You should already have an object selected from the mousedown.
        // If so, show its properties
        LLFloaterReg::showInstance("build", "Texture");
        return true;
    }
    else
    {
        // Nothing selected means the first mouse click was probably
        // bad, so try again.
        return false;
    }
}


bool LLToolFace::handleMouseDown(S32 x, S32 y, MASK mask)
{
    gViewerWindow->pickAsync(x, y, mask, pickCallback);
    return true;
}

void LLToolFace::pickCallback(const LLPickInfo& pick_info)
{
    LLViewerObject* hit_obj = pick_info.getObject();
    if (hit_obj)
    {
        S32 hit_face = pick_info.mObjectFace;

        if (hit_obj->isAvatar())
        {
            // ...clicked on an avatar, so don't do anything
            return;
        }

        // ...clicked on a world object, try to pick the appropriate face

        if (pick_info.mKeyMask & MASK_SHIFT)
        {
            // If object not selected, need to inform sim
            if ( !hit_obj->isSelected() )
            {
                // object wasn't selected so add the object and face
                LLSelectMgr::getInstance()->selectObjectOnly(hit_obj, hit_face);
            }
            else if (!LLSelectMgr::getInstance()->getSelection()->contains(hit_obj, hit_face) )
            {
                // object is selected, but not this face, so add it.
                LLSelectMgr::getInstance()->addAsIndividual(hit_obj, hit_face);
            }
            else
            {
                // object is selected, as is this face, so remove the face.
                LLSelectMgr::getInstance()->remove(hit_obj, hit_face);

                // BUG: If you remove the last face, the simulator won't know about it.
            }
        }
        else
        {
            // clicked without modifiers, select only
            // this face
            LLSelectMgr::getInstance()->deselectAll();
            LLSelectMgr::getInstance()->selectObjectOnly(hit_obj, hit_face);
        }
    }
    else
    {
        if (!(pick_info.mKeyMask == MASK_SHIFT))
        {
            LLSelectMgr::getInstance()->deselectAll();
        }
    }
}


void LLToolFace::handleSelect()
{
    // From now on, draw faces
    LLSelectMgr::getInstance()->setTEMode(true);
}


void LLToolFace::handleDeselect()
{
    // Stop drawing faces
    LLSelectMgr::getInstance()->setTEMode(false);
}


void LLToolFace::render()
{
    // for now, do nothing
}