#ifndef ROTOR_CVIMAGE
#define ROTOR_CVIMAGE

#include <math.h>
#include <cv.h>
#include <highgui.h>
#include <unordered_map>

//converting to use a cv image...
//cv::Mat supports most of what we want here
//need to think
//http://answers.opencv.org/question/8202/using-external-image-data-in-a-cvmat/

//all access to the image is presently through a pointer to the data
//cv::Mat supports this

//how will copying work?
//Rotor::Image will contain a cv::Mat object which may own its data or inherit it
//cv::Mat should take care of reference counting

//can cv::Mat

namespace Rotor {
	class pixeltables{
		//handy pixel arithmetic lookup tables as nested arrays
		//so - pixels.add[0x78][0x66]; will give the precalculated result of adding with saturation
		// pixels.mono_weights[0][0x100]; will give the red component to convert to mono
		public:
			pixeltables(){
				add=new uint8_t*[256];
				multiply=new uint8_t*[256];
				overlay=new uint8_t*[256];
				min=new uint8_t*[256];
				max=new uint8_t*[256];
				for (int i=0;i<256;i++){
					add[i]=new uint8_t[256];
					multiply[i]=new uint8_t[256];
					overlay[i]=new uint8_t[256];
					min[i]=new uint8_t[256];
					max[i]=new uint8_t[256];
					for (int j=0;j<256;j++){
						add[i][j]=(uint8_t)std::min(i+j,0xFF);
						multiply[i][j]=(uint8_t)(((double)i)*(((double)j)/255.0));
						overlay[i][j]=j<128?(uint8_t)((i*j)>>7):255-(((0xFF-i)*(0xFF-j))>>7);
						min[i][j]=j<i?j:i;
						max[i][j]=j>i?j:i;
					}
				}
				mono_weights=new uint8_t*[3];
				double weights[3]={0.2989, 0.5870, 0.1140};
				for (int i=0;i<3;i++) {
					mono_weights[i]=new uint8_t[256];
					for (int j=0;j<256;j++){
						mono_weights[i][j]=(uint8_t)(((double)j)*weights[i]);
					}
				}
			}
			virtual ~pixeltables(){
				for (int i=0;i<256;i++){
					delete[] add[i];
					delete[] multiply[i];
					delete[] overlay[i];
					delete[] min[i];
					delete[] max[i];
				}
				delete[] add;
				delete[] multiply;
				delete[] overlay;
				delete[] min;
				delete[] max;
				for (int i=0;i<3;i++) {
					delete[] mono_weights[i];
				}
				delete[] mono_weights;
			}
			uint8_t **add;
			uint8_t **multiply;
			uint8_t **overlay;
			uint8_t **mono_weights;
			uint8_t **max;
			uint8_t **min;
	};
	static pixeltables pixels;
	class Image{
		public:
			Image(){
				zero();
			};
			Image(int _w,int _h){
				zero();
				setup(_w,_h);
			};
			~Image() {
				free();
			};
			void free(){
				if (RGBdata&&ownsRGBdata) delete[] RGBdata;
				if (Adata&&ownsAdata) delete[] Adata;
				if (Zdata&&ownsZdata) delete[] Zdata;
				rgb.release();
				alpha.release();
				zero();
			}
			void zero(){
				RGBdata=nullptr;
				Adata=nullptr;
				Zdata=nullptr;
				w=0;
				h=0;
				ownsRGBdata=ownsAdata=ownsZdata=false;
			}
			//space out to 32 bit RGB padding for cairo
			void convert24();
			void convert32();
			int getStride(){
				return w*3;
			}
			bool clear(){
				rgb.setTo(0);
				return true;
			};
			bool setup(int _w,int _h){ //set up with internal data
				if ((w!=_w)|(h!=_h)){
					free();
					rgb.create(_h,_w,CV_8UC3);
					RGBdata=rgb.data; //can move to use the bare pointer eventually
					ownsRGBdata=false; //will not be necessary
					w=_w;
					h=_h;
				}
				return true;
				/*
				if (w!=_w||h!=_h||!ownsRGBdata||!ownsAdata||!ownsZdata){
					free();
					w=_w;
					h=_h;
					RGBdata=new uint8_t[w*h*3];
					Adata=new uint8_t[w*h];
					Zdata=new uint16_t[w*h];
					ownsRGBdata=ownsAdata=ownsZdata=true;
					return true;
				}
				else return false;
				*/
			}
			bool read_file(std::string &filename){
				rgb=cv::imread(filename,CV_LOAD_IMAGE_COLOR);
				if (rgb.empty()) return false;
				RGBdata=rgb.data;
				ownsRGBdata=false;
				w=rgb.rows;
				h=rgb.cols;
				return true;
			}
			bool setup_fromRGB(int _w,int _h,uint8_t *pRGBdata,int linepadding=0){
			//here the data belongs to libavcodec or other
			//could move to using cv::Mat there also and just passing cv:Mat over

			//linepadding causes crash, but it doesn't seem to be necessary
				// Mat::Mat(int rows, int cols, int type, void* data, size_t step=AUTO_STEP)
			 	rgb=cv::Mat(_h,_w,CV_8UC3,pRGBdata,(_w*3)+linepadding);
				//std::cerr<<"created cv::Mat with step= "<<rgb.step<<",should be "<<((_w*3)+linepadding)<<std::endl;
				
			 	RGBdata=rgb.data; //can move to use the bare pointer eventually
				ownsRGBdata=false; //will not be necessary
				w=_w;
				h=_h;
				return true;
				/*
				if (w!=_w||h!=_h||ownsRGBdata||!ownsAdata||!ownsZdata){
					free();
					w=_w;
					h=_h;
					RGBdata=pRGBdata;
					Adata=new uint8_t[w*h];
					Zdata=new uint16_t[w*h];
					ownsRGBdata=false;
					ownsAdata=ownsZdata=true;
					return true;
				}
				return false;
				*/
			}
			bool setup_fromMat(cv::Mat& othermat){
			//here the mat belongs to another object
				if (othermat.channels()==1) {
					cv::cvtColor(othermat, rgb, CV_GRAY2RGB);
			 	}
			 	else rgb=othermat;
			 	RGBdata=rgb.data; //can move to use the bare pointer eventually
				ownsRGBdata=false; //will not be necessary
				w=rgb.rows;
				h=rgb.cols;
				return true;
			}
			Image* clone(){
				Image *t=new Image();
				t->rgb=rgb.clone();
				t->w=w;
				t->h=h;
				t->RGBdata=t->rgb.data; //can move to use the bare pointer eventually
				t->ownsRGBdata=false; //always just deallocate cv::Mat from stack
				/*
				for (int i=0;i<w*h*3;i++) {
					t->RGBdata[i]=RGBdata[i];
				}
				*/
				return t;
			}
			Image & operator=(const Image &other);
			//believe these still work, don't know if these optimisations are better than opencvs..
			Image & operator+=(const Image &other);
			Image & operator*=(const Image &other);
			Image & operator^=(const Image &other);
			Image & alpha_blend(const Image &other);
			Image & alpha_blend_cv(const Image &other);
			Image & alpha_merge(const Image &other);
			Image & alpha_from_cv(cv::Mat &other);
			Image &	add_wrap(const Image &other);
			Image & divide_wrap(const Image &other);
			Image & overlay(const Image &other);
			Image &	min(const Image &other);
			Image &	max(const Image &other);
			Image & operator*=(const double &amount);
			Image & operator+=(const double &amount);
			Image & operator-=(const double &amount);
			Image & operator/=(const double &amount);
			Image * operator*(const double &amount);
			Image * operator+(const double &amount);
			Image * operator-(const double &amount);
			Image * operator/(const double &amount);
			uint8_t *RGBdata;
			uint8_t *Adata;
			uint16_t *Zdata;
			int h,w;
			bool ownsRGBdata,ownsAdata,ownsZdata; //better done through auto_ptr?

			//making the interface for mip mapping
			//should reduce in powers of 2
			//

			cv::Mat rgb;
			cv::Mat alpha;

			//store a library of mipmaps
			std::unordered_map<int,cv::Mat> mipmaps;

			cv::Mat& get_mipmap(int level);

	};
}

#endif