/*  fnirtfileutils.cpp

    Jesper Andersson, FMRIB Image Analysis Group

    Copyright (C) 2007 University of Oxford  */

/*  Part of FSL - FMRIB's Software Library
    http://www.fmrib.ox.ac.uk/fsl
    fsl@fmrib.ox.ac.uk
    
    Developed at FMRIB (Oxford Centre for Functional Magnetic Resonance
    Imaging of the Brain), Department of Clinical Neurology, Oxford
    University, Oxford, UK
    
    
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#ifndef EXPOSE_TREACHEROUS
#define EXPOSE_TREACHEROUS           // To allow us to use .sampling_mat()
#endif

#include <boost/shared_ptr.hpp>
#include "newmat.h"
#include "utils/options.h"
#include "miscmaths/miscmaths.h"
#include "newimage/newimageall.h"
#include "basisfield/basisfield.h"
#include "basisfield/splinefield.h"
#include "basisfield/dctfield.h"
#include "warpfns/warpfns.h"
#include "warpfns/fnirt_file_reader.h"
#include "warpfns/fnirt_file_writer.h"

using namespace boost;
using namespace Utilities;
using namespace NEWMAT;
using namespace MISCMATHS;
using namespace NEWIMAGE;
using namespace BASISFIELD;

// COMMAND LINE OPTIONS

string title="fnirtfileutils\nCopyright(c) 2012, University of Oxford (Jesper Andersson)";
string examples=string("fnirtfileutils --in=my_fnirtcoefs --ref=my_refvol --out=my_field\n") +
                string("fnirtfileutils --in=my_fnirtcoefs --ref=my_refvol --jac=my_jacobians\n") + 
                string("fnirtfileutils --in=my_fnirtcoefs --ref=my_refvol --out=my_field --withaff\n");

Option<bool> verbose(string("-v,--verbose"), false, 
		     string("switch on diagnostic messages"), 
		     false, no_argument);
Option<bool> help(string("-h,--help"), false,
		  string("display this message"),
		  false, no_argument);
Option<string> inname(string("-i,--in"), string(""),
		      string("\tfilename of input coefficient volume (to be converted)"),
		      true, requires_argument);
Option<string> refname(string("-r,--ref"), string(""),
		       string("filename for reference volume"),
		       false, requires_argument);
Option<string> outname(string("-o,--out"), string(""),
		       string("filename for output (field/coef) volume - uses relative warp convention"),
		       false, requires_argument);
Option<string> outformat(string("-f,--outformat"),string("field"),
			 string("Output format [field spline], default=field"),
			 false,requires_argument);

/* The DCT option hidden until bending energy has been implemented for DCT

Option<string> outformat(string("-f,--outformat"),string("field"),
			 string("Output format [field spline DCT], default=field"),
			 false,requires_argument);
*/

vector<float> warpresdefault(3,10.0);
Option<vector<float> > warpres(string("-w,--warpres"),warpresdefault,
			       string("Warp resolution (mm), only relevant when --outformat=spline"),
			       false,requires_argument);
vector<int> knotspacedefault;
Option<vector<int> > knotspace(string("-k,--knotspace"),knotspacedefault,
			         string("Knot-spacing (voxels), only relevant when --outformat=spline"),
			         false,requires_argument);
vector<int> dctorderdefault;
HiddenOption<vector<int> > dctorder(string("-d,--dctorder"),dctorderdefault,
			            string("DCT-order, only relevant when --outformat=DCT"),
			            false,requires_argument);
Option<string> jacname(string("-j,--jac"), string(""),
		       string("filename for output (jacobian map) volume"),
		       false, requires_argument);
Option<bool> withaff(string("-a,--withaff"), false,
		     string("If set, the affine transform is included in the field/jacobian"),
		     false, no_argument);


int main(int argc, char *argv[])
{
  OptionParser options(title, examples);

  //
  // Parse command line
  //
  try {
    options.add(inname);
    options.add(refname);
    options.add(outname);
    options.add(outformat);
    options.add(warpres);
    options.add(dctorder);
    options.add(knotspace);
    options.add(jacname);
    options.add(withaff);
    options.add(verbose);
    options.add(help);

    int i=options.parse_command_line(argc, argv);
    if (i < argc) {
      for (; i<argc; i++) {
        cerr << "Unknown input: " << argv[i] << endl;
      }
      exit(EXIT_FAILURE);
    }
    if (help.value()) {
      options.usage();
      exit(EXIT_SUCCESS);
    }
    else if (!options.check_compulsory_arguments(true)) {
      options.usage();
      exit(EXIT_FAILURE);
    }
  }  
  catch(X_OptionError& e) {
    options.usage();
    cerr << endl << e.what() << endl;
    exit(EXIT_FAILURE);
  } 
  catch(std::exception &e) {
    cerr << e.what() << endl;
    exit(EXIT_FAILURE);
  }
  //
  // Do some post-parsing not achieved by the options class
  //
  if (!outname.set() && !jacname.set()) {
    cerr << "fnirtfileutils: At least one of --out and --jac must be set" << endl;
    exit(EXIT_FAILURE);
  }
  if ((warpres.set() && dctorder.set()) ||
      (warpres.set() && knotspace.set()) ||
      (knotspace.set() && dctorder.set())) {
    cerr << "fnirtfileutils: The --warpres, --dctorder and --knotspace parameters are mutually exclusive" << endl;
    exit(EXIT_FAILURE);
  }
  if (outformat.set() && (outformat.value()!=string("field") && outformat.value()!=string("spline") && outformat.value()!=string("DCT"))) {
    cerr << "fnirtfileutils: Invalid --outformat option " << outformat.value() << endl;
    exit(EXIT_FAILURE);
  }

  //
  // Open coefficient-file and reference volume
  //
  FnirtFileReader   infile;
  volume4D<float>   coefvol;
  try {
    infile.Read(inname.value(),UnknownWarps,verbose.value());
  }
  catch(...) {
    cerr << "fnirtfileutils: Problem reading coef-file " << inname.value() << endl;
    exit(EXIT_FAILURE);
  }
  if (!infile.IsValid()) {
    cerr << "fnirtfileutils: " << inname.value() << " not a valid fnirt-coefficient file" << endl; 
    exit(EXIT_FAILURE);
  }
  volume<float>     refvol;
  if (refname.set()) { // If a reference volume was explicitly specified
    try {
      read_volume(refvol,refname.value());
    }
    catch(...) {
      cerr << "fnirtfileutils: Problem reading reference-file " << refname.value() << endl;
      exit(EXIT_FAILURE);
    }
  }
  else {
    std::vector<unsigned int> imsz = infile.FieldSize();
    std::vector<double> vxs = infile.VoxelSize();
    refvol.reinitialize(imsz[0],imsz[1],imsz[2]);
    refvol.setdims(vxs[0],vxs[1],vxs[2]);
  }

  if (outname.set()) {   // If we are to return some representation of a displacement-field
    if (outformat.value() == string("field")) { // If we are to return it in field representation
      volume4D<float> field;
      try {
        field = infile.FieldAsNewimageVolume4D(withaff.value());
      }
      catch(...) {
        cerr << "fnirtfileutils: Problem creating displacement-field " << outname.value() << endl;
        exit(EXIT_FAILURE);
      }
      try {
        FnirtFileWriter  outfile(outname.value(),refvol,field);
      }
      catch(...) {
        cerr << "fnirtfileutils: Problem writing displacement-field " << outname.value() << endl;
        exit(EXIT_FAILURE);
      }
    }
    else if (outformat.value() == string("spline")) { // If we are to return it in spline representation
      vector<unsigned int> ksp(3,0);
      if (knotspace.set()) {
        if (knotspace.value().size() == 3) for (int i=0; i<3; i++) ksp[i] = static_cast<unsigned int>(knotspace.value()[i]);
	else if (knotspace.value().size() == 1) for (int i=0; i<3; i++) ksp[i] = static_cast<unsigned int>(knotspace.value()[0]);
        else {
          cerr << "fnirtfileutils: --knotspace must be 1 or 3 elements long " << endl;
          exit(EXIT_FAILURE);
	}
      }
      else {
        vector<float> tmpwres(3,0.0);
        if (warpres.value().size() == 3) tmpwres=warpres.value();
        else if (warpres.value().size() == 1) for (int i=0; i<3; i++) tmpwres[i] = (warpres.value())[0];
        else {
          cerr << "fnirtfileutils: --warpres must be 1 or 3 elements long " << endl;
          exit(EXIT_FAILURE);
	}
        ksp[0] = static_cast<unsigned int>(floor(tmpwres[0]/refvol.xdim() + 0.5));
        ksp[1] = static_cast<unsigned int>(floor(tmpwres[1]/refvol.ydim() + 0.5));
        ksp[2] = static_cast<unsigned int>(floor(tmpwres[2]/refvol.zdim() + 0.5));
      }
      if (verbose.value()) {
        cout << "Calculating spline coefficients for ksp = " << ksp[0] << ", " << ksp[1] << ", " << ksp[2] << endl;
      }
      vector<shared_ptr<basisfield> > fields(3);
      try {
        for (int i=0; i<3; i++) fields[i] = shared_ptr<splinefield>(new splinefield(infile.FieldAsSplinefield(i,ksp)));
      }
      catch(...) {
        cerr << "fnirtfileutils: Problem calculating spline coefficients " << endl;
        exit(EXIT_FAILURE);
      }
      try {
        FnirtFileWriter outfile(outname.value(),fields,infile.AffineMat());
      }
      catch (...) {
        cerr << "fnirtfileutils: Problem writing spline coefficient file " << outname.value() << endl;
        exit(EXIT_FAILURE);
      }
    }
    else if (outformat.value() == string("DCT")) { // If we are to return it in DCT representation
      vector<unsigned int>  order(3);
      if (dctorder.set()) {
        if (dctorder.value().size() == 3) for (int i=0; i<3; i++) order[i] = static_cast<unsigned int>(dctorder.value()[i]);
	else if (dctorder.value().size() == 1) for (int i=0; i<3; i++) order[i] = static_cast<unsigned int>(dctorder.value()[0]);
        else {
          cerr << "fnirtfileutils: --dctorder must be 1 or 3 elements long " << endl;
          exit(EXIT_FAILURE);
	}
      }
      else {
        vector<float>  tmpwres(3);
        if (warpres.value().size() == 3) tmpwres=warpres.value();
        else if (warpres.value().size() == 1) for (int i=0; i<3; i++) tmpwres[i] = (warpres.value())[0];
        else {
          cerr << "fnirtfileutils: --warpres must be 1 or 3 elements long " << endl;
          exit(EXIT_FAILURE);
	}
        order[0] = static_cast<unsigned int>(floor(refvol.xdim()*refvol.xsize()/tmpwres[0] + 0.5));
        order[1] = static_cast<unsigned int>(floor(refvol.ydim()*refvol.ysize()/tmpwres[1] + 0.5));
        order[2] = static_cast<unsigned int>(floor(refvol.zdim()*refvol.zsize()/tmpwres[2] + 0.5));
      }
      if (verbose.value()) {
        cout << "Calculating DCT coefficients for order = " << order[0] << ", " << order[1] << ", " << order[2] << endl;
      }
      vector<shared_ptr<basisfield> > fields(3);
      try {
        for (int i=0; i<3; i++) fields[i] = shared_ptr<dctfield>(new dctfield(infile.FieldAsDctfield(i,order)));
      }
      catch(...) {
        cerr << "fnirtfileutils: Problem calculating DCT coefficients " << endl;
        exit(EXIT_FAILURE);
      }
      try {
        FnirtFileWriter outfile(outname.value(),fields,infile.AffineMat());
      }
      catch (...) {
        cerr << "fnirtfileutils: Problem writing DCT coefficient file " << outname.value() << endl;
        exit(EXIT_FAILURE);
      }
    }
  }  

  if (jacname.set()) { // If we are to return a Jacobian field
    if (infile.Type()!=FnirtSplineDispType && infile.Type()!=FnirtDCTDispType) {
      cerr << "fnirtfileutils: Can presently only generate Jacobian from coefficient files " << endl;
      exit(EXIT_FAILURE);
    }
    else {
      try {
        volume<float>  ojac(refvol.xsize(),refvol.ysize(),refvol.zsize());
        volume<float>  jac = infile.Jacobian(withaff.value());
        if (samesize(ojac,jac)) {
	  ojac = jac;
          ojac.copyproperties(refvol);
	}
        else {
          ojac.copyproperties(refvol);
          jac.setextrapolationmethod(extraslice);
          Matrix O2I = jac.sampling_mat().i() * ojac.sampling_mat();
          ColumnVector xo(4), xi(4);
          int zs = ojac.zsize(), ys = ojac.ysize(), xs = ojac.xsize();
          xo(4) = 1.0;
          for (int z=0; z<zs; z++) { xo(3)=double(z); for (int y=0; y<ys; y++) { xo(2)=double(y); for (int x=0; x<xs; x++) {
		xo(1)=double(x);
                xi = O2I*xo;
                ojac(x,y,z) = jac.interpolate(xi(1),xi(2),xi(3));
	  } } }
	}
        ojac.setDisplayMaximum(0.0); ojac.setDisplayMinimum(0.0);
        save_volume(ojac,jacname.value());
      }
      catch(...) {
        cerr << "fnirtfileutils: Problem creating/writing Jacobian file " << jacname.value() << endl;
        exit(EXIT_FAILURE);
      }
    }
  }
  exit(EXIT_SUCCESS);
}