// Copyright (C) 2004  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 2 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 Spot; see the file COPYING.  If not, write to the Free
// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.

#include <ostream>
#include "evtgba/evtgba.hh"
#include "dotty.hh"
#include "reachiter.hh"
#include "misc/escape.hh"
#include "misc/bareword.hh"

namespace spot
{
  namespace
  {
    class dotty_bfs : public evtgba_reachable_iterator_breadth_first
    {
    public:
      dotty_bfs(const evtgba* a, std::ostream& os)
	: evtgba_reachable_iterator_breadth_first(a), os_(os)
      {
      }

      void
      start(int n)
      {
	os_ << "digraph G {" << std::endl;
	for (int i = 0; i < n;)
	  {
	    ++i;
	    os_ << "  \"*" << i
		<< "\" [label=\"\", style=invis, height=0]" << std::endl;
	    os_ << "  \"*" << i << "\" -> " << i << std::endl;
	  }
      }

      void
      end()
      {
	os_ << "}" << std::endl;
      }

      void
      process_state(const state* s, int n, evtgba_iterator*)
      {
	os_ << "  " << n << " [label="
	    << quote_unless_bare_word(automata_->format_state(s))
	    << "]" << std::endl;
      }

      void
      process_link(int in, int out, const evtgba_iterator* si)
      {
	os_ << "  " << in << " -> " << out << " [label=\"";
	escape_str(os_, automata_->format_label(si->current_label()))
	  << "\\n";
	escape_str(os_, automata_->format_acceptance_conditions
		   (si->current_acceptance_conditions()))
	  << "\"]" << std::endl;
      }

    private:
      std::ostream& os_;
    };
  }

  std::ostream&
  dotty_reachable(std::ostream& os, const evtgba* g)
  {
    dotty_bfs d(g, os);
    d.run();
    return os;
  }


}