#include <iostream>
#include <sstream>
#include <string>
#include <wcs.h>
#include <wcshdr.h>
#define WCSLIB_GETWCSTAB // define this so that we don't try to redefine wtbarr
                         // (this is a problem when using gcc v.4+
#include <fitsio.h>
#include <duchamp.hh>
#include <Cubes/cubes.hh>

int Cube::readReconCube()
{
  /** 
   *  Cube::readReconCube()
   *   
   *   A way to read in a previously reconstructed array, corresponding 
   *    to the requested parameters, or in the filename given by reconFile.
   *   Performs various tests to make sure there are no clashes between 
   *    the requested parameters and those stored in the header of the 
   *    FITS file. Also test to make sure that the size (and subsection, 
   *    if applicable) of the array is the same.
   */


  int status = 0;

  // Check to see whether the parameters reconFile and/or residFile are defined
  bool reconGood = false;
  int exists;
  std::stringstream errmsg;
  if(this->par.getReconFile() != ""){
    reconGood = true;
    fits_file_exists(this->par.getReconFile().c_str(),&exists,&status);
    if(exists<=0){
      fits_report_error(stderr, status);
      errmsg<< "Cannot find requested ReconFile. Trying with parameters.\n"
	    << "Bad reconFile was: "<<this->par.getReconFile() << std::endl;
      duchampWarning("readReconCube", errmsg.str());
      reconGood = false;
    }
  }
  else{
    errmsg<< "ReconFile not specified. Working out name from parameters.\n";
  }
  
  if(!reconGood){ // if bad, need to look at parameters

    string reconFile = this->par.outputReconFile();
    errmsg << "Trying file " << reconFile << std::endl;
    duchampWarning("readReconCube", errmsg.str() );
    reconGood = true;
    fits_file_exists(reconFile.c_str(),&exists,&status);
    if(exists<=0){
      fits_report_error(stderr, status);
      duchampWarning("readReconCube","ReconFile not present.\n");
      reconGood = false;
    }

    if(reconGood){ 
      // were able to open this new file -- use this, so reset the 
      //  relevant parameter
      this->par.setReconFile(reconFile);
    }
    else { // if STILL bad, give error message and exit.
      duchampError("readReconCube","Cannot find reconstructed file.\n");
      return FAILURE;
    }

  }

  // if we get to here, reconGood is true (ie. file is open);
  status=0;
  fitsfile *fptr;
  fits_open_file(&fptr,this->par.getReconFile().c_str(),READONLY,&status);
  short int maxdim=3;
  long *fpixel = new long[maxdim];
  for(int i=0;i<maxdim;i++) fpixel[i]=1;
  long *dimAxesNew = new long[maxdim];
  for(int i=0;i<maxdim;i++) dimAxesNew[i]=1;
  long nelements;
  int bitpix,numAxesNew,anynul;

  status = 0;
  fits_get_img_param(fptr, maxdim, &bitpix, &numAxesNew, dimAxesNew, &status);
  if(status){
    fits_report_error(stderr, status);
    return FAILURE;
  }

  if(numAxesNew != this->numDim){
    std::stringstream errmsg;
    errmsg << "Reconstructed cube has a different number of axes to original!"
	   << " (" << numAxesNew << " cf. " << this->numDim << ")\n";
    duchampError("readReconCube", errmsg.str());
    return FAILURE;
  }

  for(int i=0;i<numAxesNew;i++){
    if(dimAxesNew[i]!=this->axisDim[i]){
      std::stringstream errmsg;
      errmsg << "Reconstructed cube has different axis dimensions to original!"
	     << "\nAxis #" << i+1 << " has size " << dimAxesNew[i] 
	     << " cf. " << this->axisDim[i] <<" in original.\n";	
      duchampError("readReconCube", errmsg.str());
      return FAILURE;
    }
  }

  char *comment = new char[80];

  if(this->par.getFlagSubsection()){
    char *subsection = new char[80];
    status = 0;
    fits_read_key(fptr, TSTRING, (char *)keyword_subsection.c_str(), 
		  subsection, comment, &status);
    if(status){
      duchampError("readReconCube", 
		   "subsection keyword not present in reconFile.\n");
      return FAILURE;
    }
    else{
      if(this->par.getSubsection() != subsection){
	std::stringstream errmsg;
	errmsg << "subsection keyword in reconFile (" << subsection 
	       << ") does not match that requested (" 
	       << this->par.getSubsection() << ").\n";
	duchampError("readReconCube", errmsg.str());
	return FAILURE;
      }
    }
    delete subsection;
  }

  int scaleMin,filterCode,reconDim;
  float snrRecon;
  status = 0;
  fits_read_key(fptr, TINT, (char *)keyword_reconDim.c_str(), 
		&reconDim, comment, &status);
  if(reconDim != this->par.getReconDim()){
    std::stringstream errmsg;
    errmsg << "reconDim keyword in reconFile (" << reconDim
	   << ") does not match that requested (" 
	   << this->par.getReconDim() << ").\n";
    duchampError("readReconCube", errmsg.str());
    return FAILURE;
  }
  status = 0;
  fits_read_key(fptr, TINT, (char *)keyword_filterCode.c_str(), 
		&filterCode, comment, &status);
  if(filterCode != this->par.getFilterCode()){
    std::stringstream errmsg;
    errmsg << "filterCode keyword in reconFile (" << filterCode
	   << ") does not match that requested (" 
	   << this->par.getFilterCode() << ").\n";
    duchampError("readReconCube", errmsg.str());
    return FAILURE;
  }
  status = 0;
  fits_read_key(fptr, TFLOAT, (char *)keyword_snrRecon.c_str(), 
		&snrRecon, comment, &status);
  if(snrRecon != this->par.getAtrousCut()){
    std::stringstream errmsg;
    errmsg << "snrRecon keyword in reconFile (" << snrRecon
	   << ") does not match that requested (" 
	   << this->par.getAtrousCut() << ").\n";
    duchampError("readReconCube", errmsg.str());
    return FAILURE;
  }
  status = 0;
  fits_read_key(fptr, TINT, (char *)keyword_scaleMin.c_str(), 
		&scaleMin, comment, &status);
  if(scaleMin != this->par.getMinScale()){
    std::stringstream errmsg;
    errmsg << "scaleMin keyword in reconFile (" << scaleMin
	   << ") does not match that requested (" 
	   << this->par.getMinScale() << ").\n";
    duchampError("readReconCube", errmsg.str());
    return FAILURE;
  }
  
  //
  // If we get to here, the reconFile exists and matches the atrous parameters 
  // the user has requested.

  float *reconArray = new float[this->numPixels];
  status = 0;
  fits_read_pix(fptr, TFLOAT, fpixel, this->numPixels, NULL, reconArray, 
		&anynul, &status);
  this->saveRecon(reconArray,this->numPixels);
  
  status = 0;
  fits_close_file(fptr, &status);
  if (status){
    duchampWarning("readReconCube", "Error closing file: ");
    fits_report_error(stderr, status);
  }

  // We don't want to write out the recon or resid files at the end
  this->par.setFlagOutputRecon(false);
  this->par.setFlagOutputResid(false);

  // The reconstruction is done -- set the appropriate flag
  this->reconExists = true;

  return SUCCESS;
}