/*

  This file is part of solidity.

  solidity 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.

  solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

// SPDX-License-Identifier: GPL-3.0

#pragma once

#include <libsmtutil/BMCSolverInterface.h>

#include <vector>

namespace solidity::smtutil

{

/**

 * The SMTPortfolio wraps all available solvers within a single interface,

 * propagating the functionalities to all solvers.

 * It also checks whether different solvers give conflicting answers

 * to SMT queries.

 */

class SMTPortfolio: public BMCSolverInterface

{

public:

  /// Noncopyable.

  SMTPortfolio(SMTPortfolio const&) = delete;

  SMTPortfolio& operator=(SMTPortfolio const&) = delete;

  SMTPortfolio(std::vector<std::unique_ptr<BMCSolverInterface>> solvers, std::optional<unsigned> _queryTimeout);

  void reset() override;

  void push() override;

  void pop() override;

  void declareVariable(std::string const&, SortPointer const&) override;

  void addAssertion(Expression const& _expr) override;

  std::pair<CheckResult, std::vector<std::string>> check(std::vector<Expression> const& _expressionsToEvaluate) override;

  std::vector<std::string> unhandledQueries() override;

  size_t solvers() override { return m_solvers.size(); }

  std::string dumpQuery(std::vector<Expression> const& _expressionsToEvaluate);

private:

  static bool solverAnswered(CheckResult result);

  std::vector<std::unique_ptr<BMCSolverInterface>> m_solvers;

  std::vector<Expression> m_assertions;

};

}