//===============================
//
// Implementation for image reader class
//

#include <iostream>
#include <fstream>

#include "Image.h"
#include "ImageReader.h"

// ------------------------------------
// Method to read a set of images from a set of files
std::vector<Image*> ImageReader::readImages( std::vector<std::string> files )
{

  std::vector<Image*> images;

  for( int ind=0; ind < files.size() ; ++ind )
   {
     Image* newImage = this->readAnImage( files[ind] ) ;
     images.push_back( newImage ) ;
  }

  return images ;
}


//-------------------------------------
// Method to read a single image from a single file
Image* ImageReader::readAnImage( std::string file )
{
  // Open file
  std::ifstream ifile( file.c_str() ) ;
  if( ! ifile ) 
  {
    std::cout << " Error - cannot read file specified "+file << std::endl;
    return NULL ;
  }


  // Read first number which is the date
  int date ;
  ifile >> date ;

  // Read second number which is the number of pixels
  int noPixels ;
  ifile >> noPixels ;

 
  // Read rest of file
  std::vector<int> pixels ;
  int pixel ;

  for( int ind=0; ind < noPixels ; ++ind )
  {
    ifile >> pixel ;
    pixels.push_back( pixel );
  }
  
  Image* i = new Image( date, pixels ) ;

  return i ;
}