/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2020 Osimis S.A., Belgium
 *
 * This program 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, either version 3 of
 * the License, or (at your option) any later version.
 *
 * This program 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 program. If not, see
 * <http://www.gnu.org/licenses/>.
 **/

#include "CreateAngleMeasureTracker.h"
#include "CreateAngleMeasureCommand.h"

#include <OrthancException.h>

namespace OrthancStone
{
  CreateAngleMeasureTracker::CreateAngleMeasureTracker(boost::weak_ptr<IViewport> viewport,
                                                       const PointerEvent& e) :
    CreateMeasureTracker(viewport),
    state_(CreatingSide1)
  {
    ScenePoint2D point;
    
    {    
      std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
      Scene2D& scene = lock->GetController().GetScene();
      point = e.GetMainPosition().Apply(scene.GetCanvasToSceneTransform());
    }
    
    command_.reset(new CreateAngleMeasureCommand(viewport, point));
  }

  CreateAngleMeasureTracker::~CreateAngleMeasureTracker()
  {
  }

  void CreateAngleMeasureTracker::PointerMove(const PointerEvent& event)
  {
    if (!alive_)
    {
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
        "Internal error: wrong state in CreateAngleMeasureTracker::"
        "PointerMove: active_ == false");
    }

    
    {
      std::unique_ptr<IViewport::ILock> lock(GetViewportLock());
      ViewportController& controller = lock->GetController();

      ScenePoint2D scenePos = event.GetMainPosition().Apply(
        controller.GetScene().GetCanvasToSceneTransform());

      switch (state_)
      {
        case CreatingSide1:
          GetCommand()->SetCenter(scenePos);
          break;
        case CreatingSide2:
          GetCommand()->SetSide2End(scenePos);
          break;
        default:
          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
                                          "Wrong state in CreateAngleMeasureTracker::"
                                          "PointerMove: state_ invalid");
      }
      //LOG(TRACE) << "scenePos.GetX() = " << scenePos.GetX() << "     " <<
      //  "scenePos.GetY() = " << scenePos.GetY();
      lock->Invalidate();
    }
  }

  void CreateAngleMeasureTracker::PointerUp(const PointerEvent& e)
  {
    // TODO: the current app does not prevent multiple PointerDown AND
    // PointerUp to be sent to the tracker.
    // Unless we augment the PointerEvent structure with the button index, 
    // we cannot really tell if this pointer up event matches the initial
    // pointer down event. Let's make it simple for now.

    switch (state_)
    {
    case CreatingSide1:
      state_ = CreatingSide2;
      break;
    case CreatingSide2:
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
        "Wrong state in CreateAngleMeasureTracker::"
        "PointerUp: state_ == CreatingSide2 ; this should not happen");
      break;
    default:
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
        "Wrong state in CreateAngleMeasureTracker::"
        "PointerMove: state_ invalid");
    }
  }

  void CreateAngleMeasureTracker::PointerDown(const PointerEvent& e)
  {
    switch (state_)
    {
    case CreatingSide1:
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
        "Wrong state in CreateAngleMeasureTracker::"
        "PointerDown: state_ == CreatingSide1 ; this should not happen");
      break;
    case CreatingSide2:
      // we are done
      alive_ = false;
      break;
    default:
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
        "Wrong state in CreateAngleMeasureTracker::"
        "PointerMove: state_ invalid");
    }
  }

  boost::shared_ptr<CreateAngleMeasureCommand> CreateAngleMeasureTracker::GetCommand()
  {
    return boost::dynamic_pointer_cast<CreateAngleMeasureCommand>(command_);
  }

}