// ======================================================================== //
// Copyright 2009-2017 Intel Corporation                                    //
//                                                                          //
// Licensed under the Apache License, Version 2.0 (the "License");          //
// you may not use this file except in compliance with the License.         //
// You may obtain a copy of the License at                                  //
//                                                                          //
//     http://www.apache.org/licenses/LICENSE-2.0                           //
//                                                                          //
// Unless required by applicable law or agreed to in writing, software      //
// distributed under the License is distributed on an "AS IS" BASIS,        //
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
// See the License for the specific language governing permissions and      //
// limitations under the License.                                           //
// ======================================================================== //

#pragma once

#include "../default.h"
#include "application.h"
#include "camera.h"
#include "scene.h"
#include "scene_device.h"

namespace embree
{
  /* functions provided by each tutorial */
  extern "C" void device_init(const char* cfg);
  extern "C" void device_resize(int width, int height);
  extern "C" void device_render(unsigned* pixels, const unsigned width, const unsigned height, const float time, const ISPCCamera& camera);
  extern "C" bool device_pick(const float x, const float y, const ISPCCamera& camera, Vec3fa& hitPos);
  extern "C" void device_key_pressed (int key);
  extern "C" void device_cleanup();

  class TutorialApplication : public Application
  {
  public:
    TutorialApplication (const std::string& tutorialName, const int features);
    virtual ~TutorialApplication();

  public:
    /* starts tutorial */
    void run(int argc, char** argv);

    /* virtual main function, contains all tutorial logic */
    virtual int main(int argc, char** argv);

    /* callback called after command line parsing finished */
    virtual void postParseCommandLine() {}
   
    /* benchmark mode */
    void renderBenchmark();
    
    /* render to file mode */
    void renderToFile(const FileName& fileName);

    /* passes parameters to the backend */
    void set_parameter(size_t parm, ssize_t val);
    
    /* resize framebuffer */
    void resize(unsigned width, unsigned height);
    
    /* set scene to use */
    void set_scene (TutorialScene* in);

    /* GLUT callback functions */
  public:
    virtual void keyboardFunc(unsigned char key, int x, int y);
    virtual void specialFunc(int key, int, int);
    virtual void clickFunc(int button, int state, int x, int y);
    virtual void motionFunc(int x, int y);
    virtual void displayFunc(void);
    virtual void reshapeFunc(int width, int height);
    virtual void idleFunc();
    
  public:
    std::string tutorialName;
          
    /* render settings */
    Camera camera;
    Shader shader;
    
    /* framebuffer settings */
    unsigned width;
    unsigned height;
    unsigned* pixels;

    /* image output settings */
    FileName outputImageFilename;

    /* benchmark mode settings */
    size_t skipBenchmarkFrames;
    size_t numBenchmarkFrames;
    size_t numBenchmarkRepetitions;
  
    /* window settings */
    bool interactive;
    bool fullscreen;
    bool consoleOutput;

    unsigned window_width;
    unsigned window_height;
    int windowID;
    
    double time0;
    int debug_int0;
    int debug_int1;
    
    int mouseMode;
    int clickX, clickY;
    
    float speed;

  public:
    static TutorialApplication* instance;
  };

  class SceneLoadingTutorialApplication : public TutorialApplication
  {
  public:
    SceneLoadingTutorialApplication (const std::string& tutorialName, int features);

    virtual int main(int argc, char** argv);

  public:
    TutorialScene obj_scene;
    Ref<SceneGraph::GroupNode> scene;
    bool convert_tris_to_quads;
    bool convert_bezier_to_lines;
    bool convert_hair_to_curves;
    FileName sceneFilename;
    std::vector<FileName> keyFramesFilenames;
    int instancing_mode;
    std::string subdiv_mode;
  };
}