// -*- coding: utf-8 -*-
// Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015 Laboratoire de
// Recherche et Développement de l'Epita (LRDE).
// Copyright (C) 2003, 2004, 2005, 2006 Laboratoire d'Informatique de
// Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
// Université Pierre et Marie Curie.
//
// This file is part of Spot, a model checking library.
//
// Spot 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.
//
// Spot 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 this program.  If not, see <http://www.gnu.org/licenses/>.

#pragma once

#include "ltlast/formula.hh"
#include "twa/twagraph.hh"
#include "ltlvisit/apcollect.hh"
#include "ltlvisit/simplify.hh"

namespace spot
{
  /// \ingroup twa_ltl
  /// \brief Build a spot::twa_graph_ptr from an LTL formula.
  ///
  /// This is based on the following paper.
  /** \verbatim
      @InProceedings{couvreur.99.fm,
        author	  = {Jean-Michel Couvreur},
        title     = {On-the-fly Verification of Temporal Logic},
        pages     = {253--271},
        editor	  = {Jeannette M. Wing and Jim Woodcock and Jim Davies},
        booktitle = {Proceedings of the World Congress on Formal Methods in the
      		     Development of Computing Systems (FM'99)},
        publisher = {Springer-Verlag},
        series	  = {Lecture Notes in Computer Science},
        volume	  = {1708},
        year      = {1999},
        address	  = {Toulouse, France},
        month	  = {September},
        isbn      = {3-540-66587-0}
      }
      \endverbatim */
  ///
  /// \param f The formula to translate into an automaton.
  ///
  /// \param dict The spot::bdd_dict the constructed automata should use.
  ///
  /// \param exprop When set, the algorithm will consider all properties
  /// combinations possible on each state, in an attempt to reduce
  /// the non-determinism.  The automaton will have the same size as
  /// without this option, but because the transition will be more
  /// deterministic, the product automaton will be smaller (or, at worse,
  /// equal).
  ///
  /// \param symb_merge When false, states with the same symbolic
  /// representation (these are equivalent formulae) will not be
  /// merged.
  ///
  /// \param branching_postponement When set, several transitions leaving
  /// from the same state with the same label (i.e., condition + acceptance
  /// conditions) will be merged.  This correspond to an optimization
  /// described in the following paper.
  /** \verbatim
      @InProceedings{	  sebastiani.03.charme,
        author	  = {Roberto Sebastiani and Stefano Tonetta},
        title	  = {"More Deterministic" vs. "Smaller" B{\"u}chi Automata for
      		     Efficient LTL Model Checking},
        booktitle = {Proceedings for the 12th Advanced Research Working
      		     Conference on Correct Hardware Design and Verification
      		     Methods (CHARME'03)},
        pages     = {126--140},
        year      = {2003},
        editor	  = {G. Goos and J. Hartmanis and J. van Leeuwen},
        volume	  = {2860},
        series	  = {Lectures Notes in Computer Science},
        month     = {October},
        publisher = {Springer-Verlag}
      }
      \endverbatim */
  ///
  /// \param fair_loop_approx When set, a really simple characterization of
  /// unstable state is used to suppress all acceptance conditions from
  /// incoming transitions.
  ///
  /// \param unobs When non-zero, the atomic propositions in the LTL formula
  /// are interpreted as events that exclude each other.  The events in the
  /// formula are observable events, and \c unobs can be filled with
  /// additional unobservable events.
  ///
  /// \param simplifier If this parameter is set, the LTL formulae
  /// representing each state of the automaton will be simplified
  /// before computing the successor.  \a simpl should be configured
  /// for the type of reduction you want, see
  /// spot::ltl::ltl_simplifier.  This idea is taken from the
  /// following paper.
  /** \verbatim
      @InProceedings{	  thirioux.02.fmics,
        author	  = {Xavier Thirioux},
        title     = {Simple and Efficient Translation from {LTL} Formulas to
      		    {B\"u}chi Automata},
        booktitle = {Proceedings of the 7th International ERCIM Workshop in
      		     Formal Methods for Industrial Critical Systems (FMICS'02)},
        series	  = {Electronic Notes in Theoretical Computer Science},
        volume	  = {66(2)},
        publisher = {Elsevier},
        editor	  = {Rance Cleaveland and Hubert Garavel},
        year      = {2002},
        month     = jul,
        address	  = {M{\'a}laga, Spain}
      }
      \endverbatim */
  ///
  /// \param unambiguous When true, unambigous TGBA will be produced using
  /// the trick described in the following paper.
  /** \verbatim
      @InProceedings{	  benedikt.13.tacas,
        author	  = {Michael Benedikt and Rastislav Lenhardt and James
      		     Worrell},
        title     = {{LTL} Model Checking of Interval Markov Chains},
        booktitle = {19th International Conference on Tools and Algorithms for
      		     the Construction and Analysis of Systems (TACAS'13)},
        year      = {2013},
        pages     = {32--46},
        series	  = {Lecture Notes in Computer Science},
        volume	  = {7795},
        editor	  = {Nir Piterman and Scott A. Smolka},
        publisher = {Springer}
      }
      \endverbatim */
  ///
  /// \return A spot::twa_graph that recognizes the language of \a f.
  SPOT_API twa_graph_ptr
  ltl_to_tgba_fm(const ltl::formula* f, const bdd_dict_ptr& dict,
		 bool exprop = false, bool symb_merge = true,
		 bool branching_postponement = false,
		 bool fair_loop_approx = false,
		 const ltl::atomic_prop_set* unobs = 0,
		 ltl::ltl_simplifier* simplifier = 0,
		 bool unambiguous = false);
}