// Copyright (C) 2010 Laboratoire de Recherche et Developpement
// de l Epita_explicit (LRDE).
//
// 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 MERCHANta_explicitBILITY
// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
// License for more deta_explicitils.
//
// 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.

#ifndef SPOT_TA_TAEXPLICIT_HH
# define SPOT_TA_TAEXPLICIT_HH

#include "misc/hash.hh"
#include <list>
#include "tgba/tgba.hh"
#include <set>
#include "ltlast/formula.hh"
#include <cassert>
#include "misc/bddlt.hh"
#include "ta.hh"

namespace spot
{
  // Forward declarations.  See below.
  class state_ta_explicit;
  class ta_explicit_succ_iterator;
  class ta_explicit;

  /// ta_explicit explicit representa_explicittion of a Testing Automata_explicit
  class ta_explicit : public ta
  {
  public:
    ta_explicit(const tgba* tgba_);

    const tgba*
    get_tgba() const;

    state_ta_explicit*
    add_state(state_ta_explicit* s);

    void
    add_to_initial_states_set(state* s);

    void
    create_transition(state_ta_explicit* source, bdd condition,
        state_ta_explicit* dest);

    void
    delete_stuttering_transitions();
    // ta interface
    virtual
    ~ta_explicit();
    virtual const states_set_t
    get_initial_states_set() const;

    virtual ta_succ_iterator*
    succ_iter(const spot::state* s) const;

    virtual ta_succ_iterator*
    succ_iter(const spot::state* s, bdd condition) const;

    virtual bdd_dict*
    get_dict() const;

    virtual std::string
    format_state(const spot::state* s) const;

    virtual bool
    is_accepting_state(const spot::state* s) const;

    virtual bool
    is_livelock_accepting_state(const spot::state* s) const;

    virtual bool
    is_initial_state(const spot::state* s) const;

    virtual bdd
    get_state_condition(const spot::state* s) const;

    virtual void
    free_state(const spot::state* s) const;

    virtual void
    delete_stuttering_and_hole_successors(spot::state* s);

  private:
    // Disallow copy.
    ta_explicit(const ta_explicit& other);
    ta_explicit&
    operator=(const ta_explicit& other);

    ta::states_set_t states_set_;
    ta::states_set_t initial_states_set_;
    const tgba* tgba_;

  };

  /// states used by spot::ta_explicit.
  /// \ingroup ta_
  class state_ta_explicit : public spot::state
  {
  public:

    struct transition
    {
      bdd condition;
      state_ta_explicit* dest;
    };

    typedef std::list<transition*> transitions;

    state_ta_explicit(const state* tgba_state, const bdd tgba_condition,
        bool is_initial_state = false, bool is_accepting_state = false,
        bool is_livelock_accepting_state = false, transitions* trans = 0) :
      tgba_state_(tgba_state), tgba_condition_(tgba_condition),
          is_initial_state_(is_initial_state), is_accepting_state_(
              is_accepting_state), is_livelock_accepting_state_(
              is_livelock_accepting_state), transitions_(trans)
    {
    }

    virtual int
    compare(const spot::state* other) const;
    virtual size_t
    hash() const;
    virtual state_ta_explicit*
    clone() const;

    virtual
    ~state_ta_explicit()
    {
    }

    transitions*
    get_transitions() const;

    // return transitions filtred by condition
    transitions*
    get_transitions(bdd condition) const;

    void
    add_transition(transition* t);

    const state*
    get_tgba_state() const;
    const bdd
    get_tgba_condition() const;
    bool
    is_accepting_state() const;
    void
    set_accepting_state(bool is_accepting_state);
    bool
    is_livelock_accepting_state() const;
    void
    set_livelock_accepting_state(bool is_livelock_accepting_state);
    bool
    is_initial_state() const;
    void
    set_initial_state(bool is_initial_state);
    void
    delete_stuttering_and_hole_successors();

    void
    free_transitions();

  private:
    const state* tgba_state_;
    const bdd tgba_condition_;
    bool is_initial_state_;
    bool is_accepting_state_;
    bool is_livelock_accepting_state_;
    transitions* transitions_;
    Sgi::hash_map<int, transitions*, Sgi::hash<int> > transitions_by_condition;

  };

  /// Successor iterators used by spot::ta_explicit.
  class ta_explicit_succ_iterator : public ta_succ_iterator
  {
  public:
    ta_explicit_succ_iterator(const state_ta_explicit* s);

    ta_explicit_succ_iterator(const state_ta_explicit* s, bdd condition);

    virtual void
    first();
    virtual void
    next();
    virtual bool
    done() const;

    virtual state*
    current_state() const;
    virtual bdd
    current_condition() const;

    virtual bool
    is_stuttering_transition() const;

  private:
    state_ta_explicit::transitions* transitions_;
    state_ta_explicit::transitions::const_iterator i_;
    const state_ta_explicit* source_;
  };

}

#endif // SPOT_TA_TAEXPLICIT_HH