//This file is part of Bertini 2.
//
//bertini2/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.
//
//bertini2/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 bertini2/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 bertini2/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 "bertini2/system.hpp"
#include "bertini2/nag_algorithms/zero_dim_solve.hpp"
#include "bertini2/endgames.hpp"

#include "bertini2/blackbox/config.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...);
}


} //ns blackbox
} //ns bertini