/**
 * Stone of Orthanc
 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
 * Department, University Hospital of Liege, Belgium
 * Copyright (C) 2017-2019 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/>.
 **/

#include "TrackerSampleApp.h"

#include "../Common/CreateLineMeasureTracker.h"

#include "../../Applications/Sdl/SdlOpenGLWindow.h"

#include "../../Framework/Scene2D/PanSceneTracker.h"
#include "../../Framework/Scene2D/RotateSceneTracker.h"
#include "../../Framework/Scene2D/Scene2D.h"
#include "../../Framework/Scene2D/ZoomSceneTracker.h"
#include "../../Framework/Scene2D/CairoCompositor.h"
#include "../../Framework/Scene2D/ColorTextureSceneLayer.h"
#include "../../Framework/Scene2D/OpenGLCompositor.h"
#include "../../Framework/StoneInitialization.h"

 // From Orthanc framework
#include <Core/Logging.h>
#include <Core/OrthancException.h>
#include <Core/Images/Image.h>
#include <Core/Images/ImageProcessing.h>
#include <Core/Images/PngWriter.h>

#include <SDL.h>
#include <stdio.h>

using namespace Orthanc;

namespace OrthancStone
{
  const char* MeasureToolToString(size_t i)
  {
    static const char* descs[] = {
      "GuiTool_Rotate",
      "GuiTool_Pan",
      "GuiTool_Zoom",
      "GuiTool_LineMeasure",
      "GuiTool_CircleMeasure",
      "GuiTool_AngleMeasure",
      "GuiTool_EllipseMeasure",
      "GuiTool_LAST"
    };
    if (i >= GuiTool_LAST)
    {
      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, "Wrong tool index");
    }
    return descs[i];
  }

  Scene2D& TrackerSampleApp::GetScene()
  {
    return scene_;
  }

  void TrackerSampleApp::SelectNextTool()
  {
    currentTool_ = static_cast<GuiTool>(currentTool_ + 1);
    if (currentTool_ == GuiTool_LAST)
      currentTool_ = static_cast<GuiTool>(0);;
    printf("Current tool is now: %s\n", MeasureToolToString(currentTool_));
  }

  void TrackerSampleApp::DisplayInfoText(const PointerEvent& e)
  {
    ScenePoint2D p = e.GetMainPosition().Apply(scene_.GetCanvasToSceneTransform());

    char buf[64];
    sprintf(buf, "(%0.02f,%0.02f)", p.GetX(), p.GetY());

    if (scene_.HasLayer(INFOTEXT_LAYER_ZINDEX))
    {
      TextSceneLayer& layer =
        dynamic_cast<TextSceneLayer&>(scene_.GetLayer(INFOTEXT_LAYER_ZINDEX));
      layer.SetText(buf);
      layer.SetPosition(p.GetX(), p.GetY());
    }
    else
    {
      std::auto_ptr<TextSceneLayer> layer(new TextSceneLayer);
      layer->SetColor(0, 255, 0);
      layer->SetText(buf);
      layer->SetBorder(20);
      layer->SetAnchor(BitmapAnchor_BottomCenter);
      layer->SetPosition(p.GetX(), p.GetY());
      scene_.SetLayer(INFOTEXT_LAYER_ZINDEX, layer.release());
    }
  }

  void TrackerSampleApp::HideInfoText()
  {
    scene_.DeleteLayer(INFOTEXT_LAYER_ZINDEX);
  }

  void TrackerSampleApp::HandleApplicationEvent(
    const OpenGLCompositor & compositor,
    const SDL_Event & event)
  {
    if (event.type == SDL_MOUSEMOTION)
    {
      int scancodeCount = 0;
      const uint8_t* keyboardState = SDL_GetKeyboardState(&scancodeCount);

      if (activeTracker_.get() == NULL &&
        SDL_SCANCODE_LCTRL < scancodeCount &&
        keyboardState[SDL_SCANCODE_LCTRL])
      {
        // The "left-ctrl" key is down, while no tracker is present
        // Let's display the info text
        PointerEvent e;
        e.AddPosition(compositor.GetPixelCenterCoordinates(event.button.x, event.button.y));
        DisplayInfoText(e);
      }
      else
      {
        HideInfoText();
        //LOG(TRACE) << "(event.type == SDL_MOUSEMOTION)";
        if (activeTracker_.get() != NULL)
        {
          //LOG(TRACE) << "(activeTracker_.get() != NULL)";
          PointerEvent e;
          e.AddPosition(compositor.GetPixelCenterCoordinates(event.button.x, event.button.y));
          //LOG(TRACE) << "event.button.x = " << event.button.x << "     " <<
          //  "event.button.y = " << event.button.y;
          //LOG(TRACE) << "activeTracker_->PointerMove(e); " <<
          //  e.GetMainPosition().GetX() << " " << e.GetMainPosition().GetY();
          activeTracker_->PointerMove(e);
          if (!activeTracker_->IsActive())
            activeTracker_ = NULL;
        }
      }
    }
    else if (event.type == SDL_MOUSEBUTTONUP)
    {
      if (activeTracker_)
      {
        PointerEvent e;
        e.AddPosition(compositor.GetPixelCenterCoordinates(event.button.x, event.button.y));
        activeTracker_->PointerUp(e);
        if (!activeTracker_->IsActive())
          activeTracker_ = NULL;
      }
    }
    else if (event.type == SDL_MOUSEBUTTONDOWN)
    {
      PointerEvent e;
      e.AddPosition(compositor.GetPixelCenterCoordinates(event.button.x, event.button.y));
      if (activeTracker_)
      {
        activeTracker_->PointerDown(e);
        if (!activeTracker_->IsActive())
          activeTracker_ = NULL;
      }
      else
      {
        // we ATTEMPT to create a tracker if need be
        activeTracker_ = CreateSuitableTracker(event, e, compositor);
      }
    }
    else if (event.type == SDL_KEYDOWN &&
      event.key.repeat == 0 /* Ignore key bounce */)
    {
      switch (event.key.keysym.sym)
      {
      case SDLK_ESCAPE:
        if (activeTracker_)
        {
          activeTracker_->Cancel();
          if (!activeTracker_->IsActive())
            activeTracker_ = NULL;
        }
        break;

      case SDLK_t:
        if (!activeTracker_)
          SelectNextTool();
        else
        {
          LOG(WARNING) << "You cannot change the active tool when an interaction"
            " is taking place";
        }
        break;

      case SDLK_s:
        scene_.FitContent(compositor.GetCanvasWidth(),
          compositor.GetCanvasHeight());
        break;

      case SDLK_c:
        TakeScreenshot(
          "screenshot.png",
          compositor.GetCanvasWidth(),
          compositor.GetCanvasHeight());
        break;

      default:
        break;
      }
    }
  }

  FlexiblePointerTrackerPtr TrackerSampleApp::CreateSuitableTracker(
    const SDL_Event & event,
    const PointerEvent & e,
    const OpenGLCompositor & compositor)
  {
    switch (event.button.button)
    {
    case SDL_BUTTON_MIDDLE:
      return CreateSimpleTrackerAdapter(PointerTrackerPtr(
        new PanSceneTracker(scene_, e)));

    case SDL_BUTTON_RIGHT:
      return CreateSimpleTrackerAdapter(PointerTrackerPtr(
        new ZoomSceneTracker(scene_, e, compositor.GetCanvasHeight())));

    case SDL_BUTTON_LEFT:
    {
      //LOG(TRACE) << "CreateSuitableTracker: case SDL_BUTTON_LEFT:";
      // TODO: we need to iterate on the set of measuring tool and perform
      // a hit test to check if a tracker needs to be created for edition.
      // Otherwise, depending upon the active tool, we might want to create
      // a "measuring tool creation" tracker

      // TODO: if there are conflicts, we should prefer a tracker that 
      // pertains to the type of measuring tool currently selected (TBD?)
      FlexiblePointerTrackerPtr hitTestTracker = TrackerHitTest(e);

      if (hitTestTracker != NULL)
      {
        //LOG(TRACE) << "hitTestTracker != NULL";
        return hitTestTracker;
      }
      else
      {
        switch (currentTool_)
        {
        case GuiTool_Rotate:
          //LOG(TRACE) << "Creating RotateSceneTracker";
          return CreateSimpleTrackerAdapter(PointerTrackerPtr(
            new RotateSceneTracker(scene_, e)));
        case GuiTool_LineMeasure:
          return FlexiblePointerTrackerPtr(new CreateLineMeasureTracker(
            scene_, undoStack_, measureTools_, e));
        case GuiTool_Pan:
          return CreateSimpleTrackerAdapter(PointerTrackerPtr(
            new PanSceneTracker(scene_, e)));
        case GuiTool_Zoom:
          return CreateSimpleTrackerAdapter(PointerTrackerPtr(
            new ZoomSceneTracker(scene_, e, compositor.GetCanvasHeight())));
        //case GuiTool_AngleMeasure:
        //  return new AngleMeasureTracker(scene_, measureTools_, undoStack_, e);
        //case GuiTool_CircleMeasure:
        //  return new CircleMeasureTracker(scene_, measureTools_, undoStack_, e);
        //case GuiTool_EllipseMeasure:
        //  return new EllipseMeasureTracker(scene_, measureTools_, undoStack_, e);
        case GuiTool_AngleMeasure:
          LOG(ERROR) << "Not implemented yet!";
          return NULL;
        case GuiTool_CircleMeasure:
          LOG(ERROR) << "Not implemented yet!";
          return NULL;
        case GuiTool_EllipseMeasure:
          LOG(ERROR) << "Not implemented yet!";
          return NULL;
        default:
          throw OrthancException(ErrorCode_InternalError, "Wrong tool!");
        }
      }
    }
    default:
      return NULL;
    }
  }


  void TrackerSampleApp::PrepareScene()
  {
    // Texture of 2x2 size
    {
      Orthanc::Image i(Orthanc::PixelFormat_RGB24, 2, 2, false);

      uint8_t* p = reinterpret_cast<uint8_t*>(i.GetRow(0));
      p[0] = 255;
      p[1] = 0;
      p[2] = 0;

      p[3] = 0;
      p[4] = 255;
      p[5] = 0;

      p = reinterpret_cast<uint8_t*>(i.GetRow(1));
      p[0] = 0;
      p[1] = 0;
      p[2] = 255;

      p[3] = 255;
      p[4] = 0;
      p[5] = 0;

      scene_.SetLayer(TEXTURE_2x2_1_ZINDEX, new ColorTextureSceneLayer(i));

      std::auto_ptr<ColorTextureSceneLayer> l(new ColorTextureSceneLayer(i));
      l->SetOrigin(-3, 2);
      l->SetPixelSpacing(1.5, 1);
      l->SetAngle(20.0 / 180.0 * M_PI);
      scene_.SetLayer(TEXTURE_2x2_2_ZINDEX, l.release());
    }

    // Texture of 1x1 size
    {
      Orthanc::Image i(Orthanc::PixelFormat_RGB24, 1, 1, false);

      uint8_t* p = reinterpret_cast<uint8_t*>(i.GetRow(0));
      p[0] = 255;
      p[1] = 0;
      p[2] = 0;

      std::auto_ptr<ColorTextureSceneLayer> l(new ColorTextureSceneLayer(i));
      l->SetOrigin(-2, 1);
      l->SetAngle(20.0 / 180.0 * M_PI);
      scene_.SetLayer(TEXTURE_1x1_ZINDEX, l.release());
    }

    // Some lines
    {
      std::auto_ptr<PolylineSceneLayer> layer(new PolylineSceneLayer);

      layer->SetThickness(1);

      PolylineSceneLayer::Chain chain;
      chain.push_back(ScenePoint2D(0 - 0.5, 0 - 0.5));
      chain.push_back(ScenePoint2D(0 - 0.5, 2 - 0.5));
      chain.push_back(ScenePoint2D(2 - 0.5, 2 - 0.5));
      chain.push_back(ScenePoint2D(2 - 0.5, 0 - 0.5));
      layer->AddChain(chain, true);

      chain.clear();
      chain.push_back(ScenePoint2D(-5, -5));
      chain.push_back(ScenePoint2D(5, -5));
      chain.push_back(ScenePoint2D(5, 5));
      chain.push_back(ScenePoint2D(-5, 5));
      layer->AddChain(chain, true);

      double dy = 1.01;
      chain.clear();
      chain.push_back(ScenePoint2D(-4, -4));
      chain.push_back(ScenePoint2D(4, -4 + dy));
      chain.push_back(ScenePoint2D(-4, -4 + 2.0 * dy));
      chain.push_back(ScenePoint2D(4, 2));
      layer->AddChain(chain, false);

      layer->SetColor(0, 255, 255);
      scene_.SetLayer(LINESET_1_ZINDEX, layer.release());
    }

    // Some text
    {
      std::auto_ptr<TextSceneLayer> layer(new TextSceneLayer);
      layer->SetText("Hello");
      scene_.SetLayer(LINESET_2_ZINDEX, layer.release());
    }
  }


  void TrackerSampleApp::DisableTracker()
  {
    if (activeTracker_)
    {
      activeTracker_->Cancel();
      activeTracker_ = NULL;
    }
  }

  void TrackerSampleApp::TakeScreenshot(const std::string& target,
    unsigned int canvasWidth,
    unsigned int canvasHeight)
  {
    // Take a screenshot, then save it as PNG file
    CairoCompositor compositor(scene_, canvasWidth, canvasHeight);
    compositor.SetFont(0, Orthanc::EmbeddedResources::UBUNTU_FONT, FONT_SIZE, Orthanc::Encoding_Latin1);
    compositor.Refresh();

    Orthanc::ImageAccessor canvas;
    compositor.GetCanvas().GetReadOnlyAccessor(canvas);

    Orthanc::Image png(Orthanc::PixelFormat_RGB24, canvas.GetWidth(), canvas.GetHeight(), false);
    Orthanc::ImageProcessing::Convert(png, canvas);

    Orthanc::PngWriter writer;
    writer.WriteToFile(target, png);
  }


  FlexiblePointerTrackerPtr TrackerSampleApp::TrackerHitTest(const PointerEvent & e)
  {
    // std::vector<MeasureToolPtr> measureTools_;
    return nullptr;
  }



}