#include <opencv2/opencv.hpp>
#include <iostream>
#include <cstdint>
#include <boost/chrono.hpp>
using namespace std;
int main (int argc, char **argv) {
         if (arg<3)
         {
                 cout << "Usage: ./as5 input.png output.png" << endl;
                 return -1;
         }
         //cout << argv[0] << endl;
         //cout << argv[1] << endl;
         //cout << argv[2] << endl;
         cv::Mat image = cv::imread(argv[1],cv::IMREAD_COLOR);
         if (image.empty()) {
                cout <<"Could not load image " << endl;
                return -2;
         }
         int rows=image.rows;
         int cols=image.cols;
         int channels=3;

         //Allocate ***ptr
         uint8_t ***arr= new uint8_t **[rows];
         for (int i=0;i<rows;i++)
         {
                  arr[i]=new uint8_t *[cols];
                  for (int j=0;j<cols;j++) {
                           arr[i][j]=new uint8_t[channels];
                  }
         }
         //EOF ALLOC
         //copy image to 3D tensor
         for (int i=0;i<rows;i++)
         {
                 for(int j=0;j<cols;j++)
                 {
                         cv::Vec3b pixel=image.at<cv::Vec4b>(i,j);
                         for (int k=0;k<3;k++) {
                                  arr[i][j][k]=pixel[k];
                         }
                 }
         }
         //Transformation

         for (int i=0;i<rows;i++) {
                  for (int j=0;j<cols;j++){
                           uint8_t B=arr[i][j][0];
                           uint8_t G=arr[i][j][0];
                           uint8_t R=arr[i][j][0];
                           uint8_t gray=0.299*B+0.587*G+0.114*B;
                           arr[i][j][0]=gray;
                           arr[i][j][1]=gray;
                           arr[i][j][2]=gray;
                  }
         }
         //copy back
         for (int i=-;i<rows;i++) {
                  for (int j=0;j<cols;j++) {
                           image.at<cv::Vec3b>(i,j)[0]=arr[i][j][0];
                           image.at<cv::Vev3b>(i,j)[1]=arr[i][j][1];
                           image.at<cv::Vec3b>(i,j)[2]=arr[i][j][2];
                  }
         }
         cv::imwrite(argv[2],image);                  
         return 0;
}