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/*! \file  example_01.cpp
    \brief Shows how to solve the mother problem of PDE-constrained optimization:
*/

#include "Teuchos_Comm.hpp"
#include "ROL_Stream.hpp"
#include "Teuchos_GlobalMPISession.hpp"
#include "Teuchos_XMLParameterListHelpers.hpp"

#include "Tpetra_Core.hpp"
#include "Tpetra_Version.hpp"

#include "ROL_Algorithm.hpp"
#include "ROL_TrustRegionStep.hpp"
#include "ROL_CompositeStep.hpp"
#include "ROL_Reduced_Objective_SimOpt.hpp"
#include "ROL_TpetraMultiVector.hpp"

#include <iostream>
#include <algorithm>

#include "data.hpp"

typedef double RealT;

int main(int argc, char *argv[]) {

  // This little trick lets us print to std::cout only if a (dummy) command-line argument is provided.
  int iprint     = argc - 1;
  ROL::Ptr<std::ostream> outStream;
  ROL::nullstream bhs; // outputs nothing

  /*** Initialize communicator. ***/
  Teuchos::GlobalMPISession mpiSession (&argc, &argv, &bhs);
  ROL::Ptr<const Teuchos::Comm<int> > comm = Tpetra::getDefaultComm();
  const int myRank = comm->getRank();
  if ((iprint > 0) && (myRank == 0)) {
    outStream = ROL::makePtrFromRef(std::cout);
  }
  else {
    outStream = ROL::makePtrFromRef(bhs);
  }

  int errorFlag  = 0;

  // *** Example body.
  try {

    /*** Read in XML input ***/
    std::string filename = "input.xml";
    Teuchos::RCP<Teuchos::ParameterList> parlist = Teuchos::rcp( new Teuchos::ParameterList() );
    Teuchos::updateParametersFromXmlFile( filename, parlist.ptr() );

    /*** Initialize main data structure. ***/
    ROL::Ptr<ElasticityData<RealT> > data = ROL::makePtr<ElasticityData<RealT>>(comm, parlist, outStream);
    ROL::Ptr<Tpetra::MultiVector<RealT> > rhs = data->getVecF();
    data->getSolver()->setB(rhs);
    ROL::Ptr<Tpetra::MultiVector<RealT> > sol = ROL::makePtr<Tpetra::MultiVector<RealT>>(rhs->getMap(), 1, true);
    //sol->putScalar(0.0);
    data->getSolver()->setX(sol);
    data->getSolver()->solve();
    //std::cout<<sol->getData(0)(0, 100)<<std::endl;
    data->outputTpetraVector(sol, "state.txt");
  
  }
  catch (std::logic_error& err) {
    *outStream << err.what() << "\n";
    errorFlag = -1000;
  }; // end try

  if (errorFlag != 0)
    std::cout << "End Result: TEST FAILED\n";
  else
    std::cout << "End Result: TEST PASSED\n";

  return 0;
}
