// This file is part of Bertini 2.
//
// blackbox/switches_zerodim.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.
//
// blackbox/switches_zerodim.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 blackbox/switches_zerodim.hpp.  If not, see
// <http://www.gnu.org/licenses/>.
//
//  Copyright(C) 2017-2021 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.
//
//  silviana amethyst, university of wisconsin-eau claire

/**
\file blackbox/switches_zerodim.hpp

\brief A sequence of switches for getting a particular instantiation of a
ZeroDim algorithm, based on runtime options.
*/

#pragma once

#include "blackbox/config.hpp"
#include "endgames.hpp"
#include "nag_algorithms/zero_dim_solve.hpp"
#include "system.hpp"

namespace bertini {
namespace blackbox {

struct ZeroDimRT {
  type::Start start = type::Start::TotalDegree;
  type::Tracker tracker = type::Tracker::Adaptive;
  type::Endgame endgame = type::Endgame::Cauchy;
};

template <typename StartType, typename TrackerType, typename EndgameType,
          template <typename, typename> class SystemManagementPol,
          typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyComplete(
    ConstTs const&... ts) {
  return std::make_unique<algorithm::ZeroDim<TrackerType, EndgameType, System,
                                             StartType, SystemManagementPol> >(
      ts...);
}

template <typename StartType, typename TrackerType, typename EndgameType,
          typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyShouldClone(
    std::true_type, ConstTs const&... ts) {
  return ZeroDimSpecifyComplete<
      StartType, TrackerType,
      typename endgame::EndgameSelector<TrackerType>::Cauchy,
      policy::CloneGiven>(ts...);
}

template <typename StartType, typename TrackerType, typename EndgameType,
          typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyShouldClone(
    std::false_type, ConstTs const&... ts) {
  return ZeroDimSpecifyComplete<
      StartType, TrackerType,
      typename endgame::EndgameSelector<TrackerType>::Cauchy,
      policy::RefToGiven>(ts...);
}

template <typename StartType, typename TrackerType, typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyEndgame(
    ZeroDimRT const& rt, ConstTs const&... ts) {
  switch (rt.endgame) {
    case type::Endgame::PowerSeries:
      return ZeroDimSpecifyShouldClone<
          StartType, TrackerType,
          typename endgame::EndgameSelector<TrackerType>::PSEG>(
          typename StorageSelector<StartType>::ShouldClone(), ts...);

    case type::Endgame::Cauchy:
      return ZeroDimSpecifyShouldClone<
          StartType, TrackerType,
          typename endgame::EndgameSelector<TrackerType>::Cauchy>(
          typename StorageSelector<StartType>::ShouldClone(), ts...);
  }
}

template <typename StartType, typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyTracker(
    ZeroDimRT const& rt, ConstTs const&... ts) {
  switch (rt.tracker) {
    case type::Tracker::FixedDouble:
      return ZeroDimSpecifyEndgame<StartType, tracking::DoublePrecisionTracker>(
          rt, ts...);
    case type::Tracker::FixedMultiple:
      return ZeroDimSpecifyEndgame<StartType,
                                   tracking::MultiplePrecisionTracker>(rt,
                                                                       ts...);
    case type::Tracker::Adaptive:
      return ZeroDimSpecifyEndgame<StartType, tracking::AMPTracker>(rt, ts...);
  }
}

template <typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> ZeroDimSpecifyStart(
    ZeroDimRT const& rt, ConstTs const&... ts) {
  switch (rt.start) {
    case type::Start::TotalDegree:
      return ZeroDimSpecifyTracker<start_system::TotalDegree>(rt, ts...);
    case type::Start::MHom:
      return ZeroDimSpecifyTracker<start_system::MHomogeneous>(rt, ts...);
    case type::Start::User:
      throw std::runtime_error(
          "trying to use generic zero dim with user homotopy.  use the "
          "specific UserBlaBla instead");
  }
}

template <typename... ConstTs>
std::unique_ptr<algorithm::AnyZeroDim> MakeZeroDim(ZeroDimRT const& rt,
                                                   ConstTs const&... ts) {
  return ZeroDimSpecifyStart(rt, ts...);
}

}  // namespace blackbox
}  // namespace bertini