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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2008 Andreas Gaida
 Copyright (C) 2008, 2009 Ralph Schreyer
 Copyright (C) 2008, 2009 Klaus Spanderen

 This file is part of QuantLib, a free-software/open-source library
 for financial quantitative analysts and developers - http://quantlib.org/

 QuantLib is free software: you can redistribute it and/or modify it
 under the terms of the QuantLib license.  You should have received a
 copy of the license along with this program; if not, please email
 <quantlib-dev@lists.sf.net>. The license is also available online at

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE.  See the license for more details.

/*! \file fdmblackscholessolver.hpp

#ifndef quantlib_fdm_black_scholes_solver_hpp
#define quantlib_fdm_black_scholes_solver_hpp

#include <ql/handle.hpp>
#include <ql/patterns/lazyobject.hpp>
#include <ql/processes/blackscholesprocess.hpp>
#include <ql/math/interpolations/cubicinterpolation.hpp>
#include <ql/experimental/finitedifferences/fdmmesher.hpp>
#include <ql/experimental/finitedifferences/fdmdirichletboundary.hpp>
#include <ql/experimental/finitedifferences/fdminnervaluecalculator.hpp>
#include <ql/experimental/finitedifferences/fdmstepconditioncomposite.hpp>
#include <ql/experimental/finitedifferences/fdmsnapshotcondition.hpp>

namespace QuantLib {

    class FdmBlackScholesSolver : public LazyObject {
        typedef std::vector<boost::shared_ptr<FdmDirichletBoundary> >

            const Handle<GeneralizedBlackScholesProcess>& process,
            const boost::shared_ptr<FdmMesher>& mesher,
            const BoundaryConditionSet & bcSet,
            const boost::shared_ptr<FdmStepConditionComposite> & condition,
            const boost::shared_ptr<FdmInnerValueCalculator>& calculator,
            Real strike,
            Time maturity,
            Size timeSteps,
            Size dampingSteps = 0,
            Real theta = 0.5,
            bool localVol = false,
            Real illegalLocalVolOverwrite = -Null<Real>());

        Real valueAt(Real s) const;
        Real deltaAt(Real s) const;
        Real gammaAt(Real s) const;
        Real thetaAt(Real s) const;

        void performCalculations() const;

        Handle<GeneralizedBlackScholesProcess> process_;
        const boost::shared_ptr<FdmMesher> mesher_;
        const BoundaryConditionSet bcSet_;
        const boost::shared_ptr<FdmSnapshotCondition> thetaCondition_;
        const boost::shared_ptr<FdmStepConditionComposite> condition_;
        const Real strike_;
        const Time maturity_;
        const Size timeSteps_;
        const Size dampingSteps_;

        const Real theta_;
        const bool localVol_;
        const Real illegalLocalVolOverwrite_;

        std::vector<Real> x_, initialValues_;
        mutable Array resultValues_;
        mutable boost::shared_ptr<CubicInterpolation> interpolation_;

#endif /* quantlib_fdm_black_scholes_solver_hpp */

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