/*
 * This program 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 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

/** \file
 * \ingroup freestyle
 */

#include <iostream>

#include "AppConfig.h"
#include "AppView.h"
#include "Controller.h"

#include "../scene_graph/LineRep.h"
#include "../scene_graph/NodeLight.h"
#include "../scene_graph/NodeShape.h"
#include "../scene_graph/VertexRep.h"
#include "../stroke/Canvas.h"
#include "../system/StringUtils.h"
#include "../view_map/Silhouette.h"
#include "../view_map/ViewMap.h"

extern "C" {
#include "BLI_blenlib.h"

#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"

#if 1  // FRS_antialiasing
#  include "BKE_global.h"
#  include "DNA_scene_types.h"
#endif

#include "FRS_freestyle.h"
}

namespace Freestyle {

AppView::AppView(const char * /*iName*/)
{
  _Fovy = DEG2RADF(30.0f);
  _ModelRootNode = new NodeDrawingStyle;
  _SilhouetteRootNode = new NodeDrawingStyle;
  _DebugRootNode = new NodeDrawingStyle;

  _RootNode.AddChild(_ModelRootNode);
  _SilhouetteRootNode->setStyle(DrawingStyle::LINES);
  _SilhouetteRootNode->setLightingEnabled(false);
  _SilhouetteRootNode->setLineWidth(2.0f);
  _SilhouetteRootNode->setPointSize(3.0f);

  _RootNode.AddChild(_SilhouetteRootNode);

  _DebugRootNode->setStyle(DrawingStyle::LINES);
  _DebugRootNode->setLightingEnabled(false);
  _DebugRootNode->setLineWidth(1.0f);

  _RootNode.AddChild(_DebugRootNode);

  _minBBox = std::min(
      std::min(_ModelRootNode->bbox().getMin()[0], _ModelRootNode->bbox().getMin()[1]),
      _ModelRootNode->bbox().getMin()[2]);
  _maxBBox = std::max(
      std::max(_ModelRootNode->bbox().getMax()[0], _ModelRootNode->bbox().getMax()[1]),
      _ModelRootNode->bbox().getMax()[2]);

  _maxAbs = std::max(rabs(_minBBox), rabs(_maxBBox));
  _minAbs = std::min(rabs(_minBBox), rabs(_maxBBox));

  _p2DSelectionNode = new NodeDrawingStyle;
  _p2DSelectionNode->setLightingEnabled(false);
  _p2DSelectionNode->setStyle(DrawingStyle::LINES);
  _p2DSelectionNode->setLineWidth(5.0f);

  _p2DNode.AddChild(_p2DSelectionNode);

  NodeLight *light = new NodeLight;
  _Light.AddChild(light);
}

AppView::~AppView()
{
  /*int ref =*//* UNUSED */ _RootNode.destroy();

  _Light.destroy();
  /*ref =*//* UNUSED */ _p2DNode.destroy();
}

real AppView::distanceToSceneCenter()
{
  BBox<Vec3r> bbox = _ModelRootNode->bbox();

  Vec3r v(UNPACK3(g_freestyle.viewpoint));
  v -= 0.5 * (bbox.getMin() + bbox.getMax());

  return v.norm();
}

real AppView::znear()
{
  BBox<Vec3r> bbox = _ModelRootNode->bbox();
  Vec3r u = bbox.getMin();
  Vec3r v = bbox.getMax();
  Vec3r cameraCenter(UNPACK3(g_freestyle.viewpoint));

  Vec3r w1(u[0], u[1], u[2]);
  Vec3r w2(v[0], u[1], u[2]);
  Vec3r w3(u[0], v[1], u[2]);
  Vec3r w4(v[0], v[1], u[2]);
  Vec3r w5(u[0], u[1], v[2]);
  Vec3r w6(v[0], u[1], v[2]);
  Vec3r w7(u[0], v[1], v[2]);
  Vec3r w8(v[0], v[1], v[2]);

  real _znear = std::min(
      (w1 - cameraCenter).norm(),
      std::min((w2 - cameraCenter).norm(),
               std::min((w3 - cameraCenter).norm(),
                        std::min((w4 - cameraCenter).norm(),
                                 std::min((w5 - cameraCenter).norm(),
                                          std::min((w6 - cameraCenter).norm(),
                                                   std::min((w7 - cameraCenter).norm(),
                                                            (w8 - cameraCenter).norm())))))));

  return std::max(_znear, 0.001);
}

real AppView::zfar()
{
  BBox<Vec3r> bbox = _ModelRootNode->bbox();
  Vec3r u = bbox.getMin();
  Vec3r v = bbox.getMax();
  Vec3r cameraCenter(UNPACK3(g_freestyle.viewpoint));

  Vec3r w1(u[0], u[1], u[2]);
  Vec3r w2(v[0], u[1], u[2]);
  Vec3r w3(u[0], v[1], u[2]);
  Vec3r w4(v[0], v[1], u[2]);
  Vec3r w5(u[0], u[1], v[2]);
  Vec3r w6(v[0], u[1], v[2]);
  Vec3r w7(u[0], v[1], v[2]);
  Vec3r w8(v[0], v[1], v[2]);

  real _zfar = std::max(
      (w1 - cameraCenter).norm(),
      std::max((w2 - cameraCenter).norm(),
               std::max((w3 - cameraCenter).norm(),
                        std::max((w4 - cameraCenter).norm(),
                                 std::max((w5 - cameraCenter).norm(),
                                          std::max((w6 - cameraCenter).norm(),
                                                   std::max((w7 - cameraCenter).norm(),
                                                            (w8 - cameraCenter).norm())))))));

  return _zfar;
}

real AppView::GetFocalLength()
{
  real Near = std::max(0.1, (real)(-2.0f * _maxAbs + distanceToSceneCenter()));
  return Near;
}

} /* namespace Freestyle */
