// This file is part of Bertini 2.
//
// events.hpp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
// events.hpp 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with events.hpp.  If not, see <http://www.gnu.org/licenses/>.
//
//  Copyright(C) 2015 - 2021 by Bertini2 Development Team
//
//  See <http://www.gnu.org/licenses/> for a copy of the license,
//  as well as COPYING.  Bertini2 is provided with permitted
//  additional terms in the b2/licenses/ directory.

// individual authors of this file include:
// silviana amethyst, university of wisconsin eau claire

/**
\file endgames/events.hpp

\brief Contains the endgames/events base types
*/

#pragma once

#include "detail/events.hpp"

namespace bertini {

namespace endgame {

/**
\brief Generic event for Endgames
*/
ADD_BERTINI_EVENT_TYPE(EndgameEvent, ConstEvent);

/**
\brief Generic failure event for Endgames
*/
ADD_BERTINI_EVENT_TYPE(EndgameFailure, ConstEvent);

/**
\brief Generic success event for Endgames
*/
ADD_BERTINI_EVENT_TYPE(EndgameSuccess, ConstEvent);

/**
\brief MinTrackTime reached during endgame
*/
ADD_BERTINI_EVENT_TYPE(MinTrackTimeReached, EndgameFailure);

/**
\brief Refining a sample failed for some reason
*/
ADD_BERTINI_EVENT_TYPE(RefiningFailed, EndgameFailure);

/**
\brief Cycle number computed was too high
*/
ADD_BERTINI_EVENT_TYPE(CycleNumTooHigh, EndgameFailure);

/**
\brief Security max norm reached.
*/
ADD_BERTINI_EVENT_TYPE(SecurityMaxNormReached, EndgameFailure);

/**
\brief Started running the endgame
*/
ADD_BERTINI_EVENT_TYPE(Initializing, EndgameEvent);

/**
\brief Time advancing
*/
ADD_BERTINI_EVENT_TYPE(TimeAdvanced, EndgameEvent);

/**
\brief Advanced around the circle around target time
*/
template <class ObservedT>
class CircleAdvanced : public EndgameEvent<ObservedT> {
  BOOST_TYPE_INDEX_REGISTER_CLASS
 public:
  using CT = typename ObservedT::BaseComplexType;
  /**
  \brief The constructor for a CircleAdvanced Event.

  \param obs The observable emitting the event.
  \param previous The precision before changing.
  \param next The precision after changing.
  */
  CircleAdvanced(const ObservedT& obs, Vec<CT> const& new_point,
                 CT const& new_time)
      : EndgameEvent<ObservedT>(obs),
        new_point_(new_point),
        new_time_(new_time) {}

  virtual ~CircleAdvanced() = default;
  CircleAdvanced() = delete;

  const auto& NewSample() const { return new_point_; }

  const auto& NewTime() const { return new_time_; }

 private:
  const Vec<CT>& new_point_;
  const CT& new_time_;
};

/**
\brief Walked a complete loop around the target time.
*/
ADD_BERTINI_EVENT_TYPE(ClosedLoop, EndgameEvent);

/**
\brief Approximated a root at target time.
*/
ADD_BERTINI_EVENT_TYPE(ApproximatedRoot, EndgameEvent);

/**
\brief Converged -- endgame is done!
*/
ADD_BERTINI_EVENT_TYPE(Converged, EndgameSuccess);

/**
\brief Refined a sample
*/
ADD_BERTINI_EVENT_TYPE(SampleRefined, EndgameEvent);

/**
\brief Made it into the EG operating zone, or so we believe
*/
ADD_BERTINI_EVENT_TYPE(InEGOperatingZone, EndgameEvent);

template <class ObservedT>
class PrecisionChanged : public EndgameEvent<ObservedT> {
  BOOST_TYPE_INDEX_REGISTER_CLASS
 public:
  /**
  \brief The constructor for a PrecisionChanged Event.

  \param obs The observable emitting the event.
  \param previous The precision before changing.
  \param next The precision after changing.
  */
  PrecisionChanged(const ObservedT& obs, unsigned previous, unsigned next)
      : EndgameEvent<ObservedT>(obs), prev_(previous), next_(next) {}

  virtual ~PrecisionChanged() = default;
  PrecisionChanged() = delete;

  /**
  \brief Get the previous precision.
  */
  auto Previous() const { return prev_; }

  /**
  \brief Get the next precision, what it changed to.
  */
  auto Next() const { return next_; }

 private:
  const unsigned prev_, next_;
};

}  // namespace endgame
}  // namespace bertini