//                                               -*- C++ -*-
/**
 *  @brief FORMResult implements the First Order Reliability Method
 *
 *  Copyright 2005-2021 Airbus-EDF-IMACS-ONERA-Phimeca
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library 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
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#ifndef OPENTURNS_FORMRESULT_HXX
#define OPENTURNS_FORMRESULT_HXX

#include "openturns/AnalyticalResult.hxx"

BEGIN_NAMESPACE_OPENTURNS



/**
 * @class FORMResult
 * FORMResult stores the FORM result
 */
class OT_API FORMResult:
  public AnalyticalResult
{
  CLASSNAME
public:


  /** Standard constructor */
  FORMResult(const Point & standardSpaceDesignPoint,
             const RandomVector & limitStateVariable,
             const Bool isStandardPointOriginInFailureSpace);

  /* Default constructor */
  FORMResult();

  /** Virtual constructor */
  FORMResult * clone() const override;

  /** EventProbability accessor */
  Scalar getEventProbability() const;

  /** GeneralisedReliabilityIndex accessor */
  Scalar getGeneralisedReliabilityIndex() const;

  /** EventProbabilitySensitivity accessor */
  Sensitivity getEventProbabilitySensitivity() const;

  /** HasoferReliabilityIndexSensitivitygraph */
  GraphCollection drawEventProbabilitySensitivity(Scalar width = ResourceMap::GetAsScalar("AnalyticalResult-DefaultWidth")) const;

  /** String converter */
  String __repr__() const override;

  /** Method save() stores the object through the StorageManager */
  void save(Advocate & adv) const override;

  /** Method load() reloads the object from the StorageManager */
  void load(Advocate & adv) override;

private:

  /** The function that actually evaluates the event probability with FORM approximation */
  void computeEventProbability() const;

  /** The function that actually evaluates the generalised reliability index with FORM approximation */
  void computeGeneralisedReliabilityIndex() const;

  /** The function that actually evaluates the  event probability sensitivity with FORM approximation */
  void computeEventProbabilitySensitivity() const;

  /** EventProbability accessor */
  void setEventProbability(const Scalar & eventProbability);

  /** GeneralisedReliabilityIndex accessor */
  void setGeneralisedReliabilityIndex(const Scalar & generalisedReliabilityIndex);

  /** EventProbabilitySensitivity accessor */
  void setEventProbabilitySensitivity(const Sensitivity & eventProbabilitySensitivity);

  mutable Scalar eventProbability_;
  mutable Scalar generalisedReliabilityIndex_;
  mutable Sensitivity eventProbabilitySensitivity_;
  mutable Bool isAlreadyComputedEventProbabilitySensitivity_;

}; // class FORMResult

END_NAMESPACE_OPENTURNS

#endif /* OPENTURNS_FORMRESULT_HXX */