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// rom_galerkin_policy_jacobian.hpp
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#ifndef ROM_IMPL_ROM_GALERKIN_POLICY_JACOBIAN_HPP_
#define ROM_IMPL_ROM_GALERKIN_POLICY_JACOBIAN_HPP_

namespace pressio{ namespace rom{ namespace galerkin{ namespace impl{

template<class GalerkinJacobianType, typename ProjectionPolicyType>
class JacobianPolicy : private ProjectionPolicyType
{

public:
  // required
  using jacobian_type = GalerkinJacobianType;

public:
  JacobianPolicy() = delete;
  JacobianPolicy(const JacobianPolicy &) = default;
  JacobianPolicy & operator=(const JacobianPolicy &) = delete;
  JacobianPolicy(JacobianPolicy &&) = default;
  JacobianPolicy & operator=(JacobianPolicy &&) = delete;
  ~JacobianPolicy() = default;

  template<typename ...Args>
  JacobianPolicy(Args && ...args)
    : ProjectionPolicyType(std::forward<Args>(args)...){}

public:
  jacobian_type create() const
  {
    return ProjectionPolicyType::template create<jacobian_type>();
  }

  template <
    class GalerkinStateType,
    class StencilStatesContainerType,
    class ScalarType,
    class StepType
    >
  void operator()(::pressio::ode::StepScheme name,
		  const GalerkinStateType & galerkinState,
		  const StencilStatesContainerType & stencilStates,
		  const ScalarType & time_np1,
		  const ScalarType & dt,
		  const StepType & currentStepNumber,
		  jacobian_type & galerkinJacobian) const
  {
    ProjectionPolicyType::compute(galerkinJacobian, galerkinState, time_np1);

    if (name == ::pressio::ode::StepScheme::BDF1){
      ::pressio::ode::impl::discrete_time_jacobian(galerkinJacobian, dt,
						   ode::BDF1());
    }
    else if (name == ::pressio::ode::StepScheme::BDF2){
      ::pressio::ode::impl::discrete_time_jacobian(galerkinJacobian, dt,
						   ode::BDF2());
    }
    else if (name == ::pressio::ode::StepScheme::CrankNicolson){
      ::pressio::ode::impl::discrete_time_jacobian(galerkinJacobian, dt,
						   ode::CrankNicolson());
    }
  }

};

}}}}
#endif  // ROM_IMPL_ROM_GALERKIN_POLICY_JACOBIAN_HPP_
