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#ifndef ROL_STDOBJECTIVE_H
#define ROL_STDOBJECTIVE_H

#include "ROL_Objective.hpp"
#include "ROL_StdVector.hpp"

/** @ingroup func_group
    \class ROL::StdObjective
    \brief Specializes the ROL::Objective interface for objective functions
    that operate on ROL::StdVector's.
*/


namespace ROL {

template <class Real>
class StdObjective : public virtual Objective<Real> {
public:
  virtual void update( const std::vector<Real> &x, bool flag = true, int iter = -1 ) {}

  using Objective<Real>::update;
  void update( const Vector<Real> &x, bool flag = true, int iter = -1 ) {
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    update(*(xs.getVector()),flag,true);
  }

  virtual Real value( const std::vector<Real> &x, Real &tol ) = 0;

  using Objective<Real>::value;
  Real value( const Vector<Real> &x, Real &tol ) {
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    return value(*(xs.getVector()),tol);
  }

  virtual void gradient( std::vector<Real> &g, const std::vector<Real> &x, Real &tol ) {
    TEUCHOS_TEST_FOR_EXCEPTION(true, std::invalid_argument,
      ">>> ERROR (ROL::StdObjective): gradient not implemented!");
  }

  using Objective<Real>::gradient;
  void gradient( Vector<Real> &g, const Vector<Real> &x, Real &tol ) {
    StdVector<Real> gs = Teuchos::dyn_cast<StdVector<Real> >(g);
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    try {
      gradient(*(gs.getVector()),*(xs.getVector()),tol);
    }
    catch (std::exception &e) {
      Objective<Real>::gradient(g,x,tol);
    }
  }

  virtual Real dirDeriv( const std::vector<Real> &x, const std::vector<Real> &d, Real &tol ) {
    TEUCHOS_TEST_FOR_EXCEPTION(true, std::invalid_argument,
      ">>> ERROR (ROL::StdObjective): dirDeriv not implemented!");
  }

  using Objective<Real>::dirDeriv;
  Real dirDeriv( const Vector<Real> &x, const Vector<Real> &d, Real &tol ) {
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    const StdVector<Real> ds = Teuchos::dyn_cast<const StdVector<Real> >(d);
    try {
      return dirDeriv(*(xs.getVector()),*(ds.getVector()),tol);
    }
    catch (std::exception &e) {
      return Objective<Real>::dirDeriv(x,d,tol);
    }
  }

  virtual void hessVec( std::vector<Real> &hv, const std::vector<Real> &v, const std::vector<Real> &x, Real &tol ) {
    TEUCHOS_TEST_FOR_EXCEPTION(true, std::invalid_argument,
      ">>> ERROR (ROL::StdObjective): hessVec not implemented!");
  }

  using Objective<Real>::hessVec;
  void hessVec( Vector<Real> &hv, const Vector<Real> &v, const Vector<Real> &x, Real &tol ) {
    try {
      StdVector<Real> hvs = Teuchos::dyn_cast<StdVector<Real> >(hv);
      const StdVector<Real> vs = Teuchos::dyn_cast<const StdVector<Real> >(v);
      const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
      hessVec(*(hvs.getVector()),*(vs.getVector()),*(xs.getVector()),tol);
    }
    catch (std::exception &e) {
      Objective<Real>::hessVec(hv,v,x,tol);
    }
  }

  virtual void invHessVec( std::vector<Real> &hv, const std::vector<Real> &v, const std::vector<Real> &x, Real &tol ) {
    TEUCHOS_TEST_FOR_EXCEPTION(true, std::invalid_argument,
      ">>> ERROR (ROL::StdObjective): invHessVec not implemented!");
  }

  using Objective<Real>::invHessVec;
  void invHessVec( Vector<Real> &hv, const Vector<Real> &v, const Vector<Real> &x, Real &tol ) {
    StdVector<Real> hvs = Teuchos::dyn_cast<StdVector<Real> >(hv);
    const StdVector<Real> vs = Teuchos::dyn_cast<const StdVector<Real> >(v);
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    invHessVec(*(hvs.getVector()),*(vs.getVector()),*(xs.getVector()),tol);
  }

  virtual void precond( std::vector<Real> &Pv, const std::vector<Real> &v, const std::vector<Real> &x, Real &tol ) {
    Pv.assign(v.begin(),v.end());
  }

  using Objective<Real>::precond;
  void precond( Vector<Real> &Pv, const Vector<Real> &v, const Vector<Real> &x, Real &tol ) {
    StdVector<Real> Pvs = Teuchos::dyn_cast<StdVector<Real> >(Pv);
    const StdVector<Real> vs = Teuchos::dyn_cast<const StdVector<Real> >(v);
    const StdVector<Real> xs = Teuchos::dyn_cast<const StdVector<Real> >(x);
    precond(*(Pvs.getVector()),*(vs.getVector()),*(xs.getVector()),tol);
  }
};

} // namespace ROL

#endif
