// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0

#pragma once

#include "../../../common/sys/platform.h"
#include "../../../common/sys/ref.h"
#include "../../../common/sys/filename.h"
#include "../../../common/math/color.h"

#include <vector>
#include <string>

namespace embree
{
  /* virtual interface to image */
  class Image : public RefCount {
  public:
    Image (size_t width, size_t height, const std::string& name) : width(width), height(height), name(name) {}
    virtual ~Image() {}
    virtual Color4 get(size_t x, size_t y) const = 0;
    virtual void   set(size_t x, size_t y, const Color4& c) = 0;
    void set(size_t x, size_t y, const Color& c) { set(x,y,Color4(c.r,c.g,c.b,1.0f)); }
    void convertToRGBA8(unsigned char *dest)
    {
      for (size_t y=0;y<height;y++)
	for (size_t x=0;x<width;x++)
	  {
	    size_t offset = 4 * (y * width + x);
	    Color4 c = get(x,y);
	    dest[offset+0] = (unsigned char)(c.r * 255.0f);
	    dest[offset+1] = (unsigned char)(c.g * 255.0f);
	    dest[offset+2] = (unsigned char)(c.b * 255.0f);
	    dest[offset+3] = (unsigned char)(c.a * 255.0f);
	  }
    }

  private:
    Image (const Image& other) DELETED; // do not implement
    Image& operator= (const Image& other) DELETED; // do not implement

  public:
    size_t width,height;
    std::string name;
  };

  /* main image class templated over element type */
  template<typename T>
    class ImageT : public Image {
  public:
    
    /*! create empty image */
    ImageT (size_t width = 0, size_t height = 0, const std::string& name = "")
      : Image(width,height,name)
    {
      data = new T[width*height];
      memset(data,0,width*height*sizeof(T));
    }

    /*! create image of constant color */
    ImageT (size_t width, size_t height, const T& color, const std::string& name = "")
      : Image(width,height,name)
    {
      data = new T[width*height];
      for (size_t i=0; i<width*height; i++) data[i] = color;
    }

    /*! initialize image from color data */
    ImageT (size_t width, size_t height, T* color, const bool copy = true, const std::string& name = "", const bool flip_y = false)
      : Image(width,height,name)
    {
      if (copy)
      {
        data = new T[width*height];

        if (flip_y)
        {
          const T* in = color + (height-1) * width;
          T* out = data;

          for (size_t y=0; y<height; y++)
          {
            for (size_t x=0; x<width; x++)
              out[x] = in[x];

            in -= width;
            out += width;
          }
        }
        else
        {
          for (size_t i=0; i<width*height; i++)
            data[i] = color[i];
        }
      } 
      else
      {
        data = color;
      }
    }

    /*! image destruction */
    virtual ~ImageT() {
      delete[] data; data = nullptr;
    }
    
    /*! returns pixel color */
    __forceinline Color4 get(size_t x, size_t y) const { 
      return Color4(data[y*width+x]); 
    }

    /*! sets pixel */
    __forceinline void set(size_t x, size_t y, const Color4& c) { 
      c.set(data[y*width+x]); 
    }

    /*! returns data pointer of image */
    __forceinline void* ptr() {
      return (void*)data;
    }

    /*! returns and forgets about data pointer of image */
    __forceinline void* steal_ptr() {
      T* ptr = data;
      data = nullptr;
      return (void*)ptr;
    }

  protected:
    T* data;
  };
  
  /*! Shortcuts for common image types. */
  typedef ImageT<Col3uc> Image3uc;
  typedef ImageT<Col3f> Image3f;
  typedef ImageT<Col4uc> Image4uc;
  typedef ImageT<Col4f> Image4f;
  
  /*! Generate a JPEG encoded image from a RGB8 buffer in memory. */
  void encodeRGB8_to_JPEG(unsigned char *image, size_t width, size_t height, unsigned char **encoded, unsigned long *capacity);

  /*! compare two images */
  double compareImages(Ref<Image> image0, Ref<Image> image1);

  /*! Loads image from file. Format is auto detected. */
  Ref<Image> loadImage(const FileName& filename, bool cache = false);

  /*! Loads image from JPEG file. */
  Ref<Image> loadJPEG(const FileName& fileName);

  /*! Loads image using OpenImageIO. */
  Ref<Image> loadOIIO(const FileName& fileName);

  /*! Loads image using stb_image. */
  Ref<Image> loadSTB(const FileName& fileName);

  /*! Loads image from EXR file. */
  Ref<Image> loadEXR(const FileName& fileName);
  
  /*! Loads image from PFM file. */
  Ref<Image> loadPFM(const FileName& fileName);

  /*! Loads image from PNG file. */
  Ref<Image> loadPNG(const FileName& fileName);

  /*! Loads image from PPM file. */
  Ref<Image> loadPPM(const FileName& fileName);

   /*! Loads image from TGA file. */
  Ref<Image> loadTGA(const FileName& fileName);

  /*! Loads image from TIFF file. */
  //Ref<Image> loadTIFF(const FileName& fileName);
  
  /*! Store image to file. Format is auto detected. */
  void storeImage(const Ref<Image>& image, const FileName& filename);

  /*! Store image to JPEG file. */
  void storeJPEG(const Ref<Image>& img, const FileName& fileName);

  /*! Store image to file using OpenImageIO. */
  void storeOIIO(const Ref<Image>& img, const FileName& fileName);

  /*! Store image to file using stb_image. */
  void storeSTB(const Ref<Image>& img, const FileName& fileName);

  /*! Store image to EXR file. */
  void storeEXR(const Ref<Image>& img, const FileName& fileName);
  
  /*! Store image to PFM file. */
  void storePFM(const Ref<Image>& img, const FileName& fileName);
  
  /*! Store image to PNG file. */
  //void storePNG(const Ref<Image>& img, const FileName& fileName);

  /*! Store image to PPM file. */
  void storePPM(const Ref<Image>& img, const FileName& fileName);
  
  /*! Store image to TGA file. */
  void storeTga(const Ref<Image>& img, const FileName& fileName);

  /*! Store image to TIFF file. */
  //void storeTIFF(const Ref<Image>& img, const FileName& fileName);

}