/**
 * 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 Affero 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
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 **/


#pragma once

#include "WorldSceneWidget.h"
#include "../Layers/IVolumeSlicer.h"
#include "../../Toolbox/Extent2D.h"
#include "../../Messages/ObserverBase.h"

#include <map>

namespace Deprecated
{
  class SliceViewerWidget :
    public WorldSceneWidget,
    public OrthancStone::ObserverBase<SliceViewerWidget>,
    public OrthancStone::IObservable
  {
  public:
    ORTHANC_STONE_DEFINE_ORIGIN_MESSAGE(__FILE__, __LINE__, GeometryChangedMessage, SliceViewerWidget);
    ORTHANC_STONE_DEFINE_ORIGIN_MESSAGE(__FILE__, __LINE__, ContentChangedMessage, SliceViewerWidget);


    // TODO - Use this message in ReferenceLineSource
    class DisplayedSliceMessage : public OrthancStone::OriginMessage<SliceViewerWidget>
    {
      ORTHANC_STONE_MESSAGE(__FILE__, __LINE__);
      
    private:
      const Deprecated::Slice& slice_;

    public:
      DisplayedSliceMessage(SliceViewerWidget& origin,
                            const Deprecated::Slice& slice) :
        OriginMessage(origin),
        slice_(slice)
      {
      }

      const Deprecated::Slice& GetSlice() const
      {
        return slice_;
      }
    };

  private:
    SliceViewerWidget(const SliceViewerWidget&);
    SliceViewerWidget& operator=(const SliceViewerWidget&);

    class Scene : public boost::noncopyable
    {
    private:
      OrthancStone::CoordinateSystem3D  plane_;
      double                            thickness_;
      size_t                            countMissing_;
      std::vector<ILayerRenderer*>      renderers_;

    public:
      void DeleteLayer(size_t index);

      Scene(const OrthancStone::CoordinateSystem3D& plane,
            double thickness,
            size_t countLayers);

      ~Scene();

      void SetLayer(size_t index,
                    ILayerRenderer* renderer);  // Takes ownership

      const OrthancStone::CoordinateSystem3D& GetPlane() const
      {
        return plane_;
      }

      bool HasRenderer(size_t index)
      {
        return renderers_[index] != NULL;
      }

      bool IsComplete() const
      {
        return countMissing_ == 0;
      }

      unsigned int GetCountMissing() const
      {
        return static_cast<unsigned int>(countMissing_);
      }

      bool RenderScene(OrthancStone::CairoContext& context,
                       const ViewportGeometry& view,
                       const OrthancStone::CoordinateSystem3D& viewportPlane);

      void SetLayerStyle(size_t index,
                         const RenderStyle& style);

      bool ContainsPlane(const OrthancStone::CoordinateSystem3D& plane) const;

      double GetThickness() const
      {
        return thickness_;
      }
    };

    
    typedef std::map<const IVolumeSlicer*, size_t>  LayersIndex;

    bool                         started_;
    LayersIndex                  layersIndex_;
    std::vector<boost::shared_ptr<IVolumeSlicer> >  layers_;
    std::vector<RenderStyle>     styles_;
    OrthancStone::CoordinateSystem3D           plane_;
    std::unique_ptr<Scene>         currentScene_;
    std::unique_ptr<Scene>         pendingScene_;
    std::vector<bool>            changedLayers_;

    bool LookupLayer(size_t& index /* out */,
                     const IVolumeSlicer& layer) const;

    void GetLayerExtent(OrthancStone::Extent2D& extent,
                        IVolumeSlicer& source) const;

    void OnGeometryReady(const IVolumeSlicer::GeometryReadyMessage& message);

    virtual void OnContentChanged(const IVolumeSlicer::ContentChangedMessage& message);

    virtual void OnSliceChanged(const IVolumeSlicer::SliceContentChangedMessage& message);

    virtual void OnLayerReady(const IVolumeSlicer::LayerReadyMessage& message);

    virtual void OnLayerError(const IVolumeSlicer::LayerErrorMessage& message);

    void ObserveLayer(IVolumeSlicer& source);

    void ResetChangedLayers();

  public:
    SliceViewerWidget(const std::string& name);

    virtual OrthancStone::Extent2D GetSceneExtent();

  protected:
    virtual bool RenderScene(OrthancStone::CairoContext& context,
                             const ViewportGeometry& view);

    void ResetPendingScene();

    void UpdateLayer(size_t index,
                     ILayerRenderer* renderer,
                     const OrthancStone::CoordinateSystem3D& plane);

    void InvalidateAllLayers();

    void InvalidateLayer(size_t layer);
    
  public:
    virtual ~SliceViewerWidget()
    {
    }

    size_t AddLayer(boost::shared_ptr<IVolumeSlicer> layer);

    void ReplaceLayer(size_t layerIndex, boost::shared_ptr<IVolumeSlicer> layer); // Takes ownership

    void RemoveLayer(size_t layerIndex);

    size_t GetLayerCount() const
    {
      return layers_.size();
    }

    const RenderStyle& GetLayerStyle(size_t layer) const;

    void SetLayerStyle(size_t layer,
                       const RenderStyle& style);

    void SetSlice(const OrthancStone::CoordinateSystem3D& plane);

    const OrthancStone::CoordinateSystem3D& GetSlice() const
    {
      return plane_;
    }

    virtual bool HasAnimation() const
    {
      return true;
    }

    virtual void DoAnimation();
  };
}