// Copyright (C) 2009 International Business Machines.
// All Rights Reserved.
// This code is published under the Eclipse Public License.
//
// $Id: TutorialCpp_main.cpp 1861 2010-12-21 21:34:47Z andreasw $
//
// Author:  Andreas Waechter               IBM    2009-04-02

// This file is part of the Ipopt tutorial.  It is a correct version
// of a C++ implemention of the coding exercise problem (in AMPL
// formulation):
//
// param n := 4;
//
// var x {1..n} <= 0, >= -1.5, := -0.5;
//
// minimize obj:
//   sum{i in 1..n} (x[i]-1)^2;
//
// subject to constr {i in 2..n-1}:
//   (x[i]^2+1.5*x[i]-i/n)*cos(x[i+1]) - x[i-1] = 0;
//
// The constant term "i/n" in the constraint is supposed to be input data
//

#include <cstdio>

#include "IpIpoptApplication.hpp"
#include "TutorialCpp_nlp.hpp"

using namespace Ipopt;

int main(int argv, char* argc[])
{
  // Set the data:

  // Number of variables
  Index N = 100;

  // constant terms in the constraints
  Number* a = new double[N-2];
  for (Index i=0; i<N-2; i++) {
    a[i] = (double(i+2))/(double)N;
  }

  // Create a new instance of your nlp
  //  (use a SmartPtr, not raw)
  SmartPtr<TNLP> mynlp = new TutorialCpp_NLP(N, a);

  // Create a new instance of IpoptApplication
  //  (use a SmartPtr, not raw)
  SmartPtr<IpoptApplication> app = new IpoptApplication();

  // Change some options
  // Note: The following choices are only examples, they might not be
  //       suitable for your optimization problem.
  app->Options()->SetNumericValue("tol", 1e-10);
  app->Options()->SetStringValue("mu_strategy", "adaptive");

  // Intialize the IpoptApplication and process the options
  app->Initialize();

  // Ask Ipopt to solve the problem
  ApplicationReturnStatus status = app->OptimizeTNLP(mynlp);

  if (status == Solve_Succeeded) {
    printf("\n\n*** The problem solved!\n");
  }
  else {
    printf("\n\n*** The problem FAILED!\n");
  }

  // As the SmartPtrs go out of scope, the reference count
  // will be decremented and the objects will automatically
  // be deleted.

  // However, we created the Number array for a here and have to delete it
  delete [] a;

  return (int) status;
}
