/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2017 Statoil ASA
//
//  ResInsight is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  ResInsight 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 General Public License at <http://www.gnu.org/licenses/gpl.html>
//  for more details.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RicFlyToObjectFeature.h"

#include "RiaApplication.h"

#include "Rim3dPropertiesInterface.h"
#include "Rim3dView.h"

#include "RiuViewer.h"

#include "cafDisplayCoordTransform.h"
#include "cafPdmObject.h"
#include "cafSelectionManager.h"

#include "cvfCamera.h"

#include <QAction>

#include <algorithm>
#include <cmath>

CAF_CMD_SOURCE_INIT( RicFlyToObjectFeature, "RicFlyToObjectFeature" );

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
bool RicFlyToObjectFeature::isCommandEnabled()
{
    if ( RicFlyToObjectFeature::boundingBoxForSelectedObjects().isValid() )
    {
        return true;
    }
    else
    {
        return false;
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RicFlyToObjectFeature::onActionTriggered( bool isChecked )
{
    Rim3dView* activeView = RiaApplication::instance()->activeReservoirView();
    if ( !activeView ) return;

    RiuViewer* destinationViewer = activeView->viewer();
    if ( !destinationViewer ) return;

    cvf::BoundingBox bb = RicFlyToObjectFeature::boundingBoxForSelectedObjects();
    CVF_ASSERT( bb.isValid() );

    cvf::ref<caf::DisplayCoordTransform> transForm = activeView->displayCoordTransform();

    cvf::Vec3d centerInDisplayCoords = transForm->transformToDisplayCoord( bb.center() );

    cvf::Vec3d directionNormalToLargesExtent = cvf::Vec3d::X_AXIS;
    double     largesExtent                  = fabs( bb.extent().y() );
    if ( fabs( bb.extent().x() ) > largesExtent )
    {
        largesExtent                  = fabs( bb.extent().x() );
        directionNormalToLargesExtent = cvf::Vec3d::Y_AXIS;
    }

    double zExtent = fabs( bb.extent().z() ) * activeView->scaleZ();
    largesExtent   = std::max( largesExtent, zExtent );

    // Scale to make the object fit in view
    largesExtent *= 2.0;

    cvf::Vec3d cameraEye          = centerInDisplayCoords + directionNormalToLargesExtent * std::max( largesExtent, 30.0 );
    cvf::Vec3d cameraViewRefPoint = centerInDisplayCoords;
    cvf::Vec3d cameraUp           = cvf::Vec3d::Z_AXIS;

    destinationViewer->mainCamera()->setFromLookAt( cameraEye, cameraViewRefPoint, cameraUp );

    destinationViewer->setPointOfInterest( cameraViewRefPoint );

    activeView->updateDisplayModelForCurrentTimeStepAndRedraw();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RicFlyToObjectFeature::setupActionLook( QAction* actionToSetup )
{
    actionToSetup->setText( "Fly to Object" );
    // actionToSetup->setIcon(QIcon(":/3DView16x16.png"));
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
cvf::BoundingBox RicFlyToObjectFeature::boundingBoxForSelectedObjects()
{
    cvf::BoundingBox bb;

    std::vector<Rim3dPropertiesInterface*> objects;
    caf::SelectionManager::instance()->objectsByType( &objects );

    for ( auto obj : objects )
    {
        if ( obj )
        {
            auto candidate = obj->boundingBoxInDomainCoords();
            if ( candidate.isValid() )
            {
                bb.add( candidate );
            }
        }
    }

    return bb;
}