/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christopher Mears <chris.mears@monash.edu>
 *
 *  Copyright:
 *     Christopher Mears, 2012
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <gecode/int/ldsb.hh>
#include <gecode/int/branch.hh>

namespace Gecode { namespace Int { namespace LDSB {
  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  VariableSymmetryImp<IntView>
  ::symmetric(Literal l, const ViewArray<IntView>& x) const {
    (void) x;
    if (indices.valid(l._variable) && indices.get(l._variable)) {
      int n = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(indices) ; i() ; ++i)
        n++;
      ArgArray<Literal> lits(n);
      int j = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(indices) ; i() ; ++i)
        lits[j++] = Literal(i.val(), l._value);
      return lits;
    } else {
      return ArgArray<Literal>(0);
    }
  }
  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  VariableSymmetryImp<BoolView>
  ::symmetric(Literal l, const ViewArray<BoolView>& x) const {
    (void) x;
    if (indices.valid(l._variable) && indices.get(l._variable)) {
      int n = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(indices) ; i() ; ++i)
        n++;
      ArgArray<Literal> lits(n);
      int j = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(indices) ; i() ; ++i)
        lits[j++] = Literal(i.val(), l._value);
      return lits;
    } else {
      return ArgArray<Literal>(0);
    }
  }

  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  ValueSymmetryImp<IntView>
  ::symmetric(Literal l, const ViewArray<IntView>& x) const {
    (void) x;
    if (values.valid(l._value) && values.get(l._value)) {
      int n = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(values) ; i() ; ++i)
        n++;
      ArgArray<Literal> lits(n);
      int j = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(values) ; i() ; ++i)
        lits[j++] = Literal(l._variable, i.val());
      return lits;
    } else {
      return ArgArray<Literal>(0);
    }
  }
  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  ValueSymmetryImp<BoolView>
  ::symmetric(Literal l, const ViewArray<BoolView>& x) const {
    (void) x;
    if (values.valid(l._value) && values.get(l._value)) {
      int n = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(values) ; i() ; ++i)
        n++;
      ArgArray<Literal> lits(n);
      int j = 0;
      for (Iter::Values::BitSetOffset<Support::BitSetOffset<Space> > i(values) ; i() ; ++i)
        lits[j++] = Literal(l._variable, i.val());
      return lits;
    } else {
      return ArgArray<Literal>(0);
    }
  }

  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  ValueSequenceSymmetryImp<Int::IntView>
  ::symmetric(Literal l, const ViewArray<IntView>& x) const {
    (void) x;
    Region region;
    Support::DynamicStack<Literal,Region> s(region);
    std::pair<int,int> location = findVar(values, n_values, seq_size, l._value);
    if (location.first == -1) return dynamicStackToArgArray(s);
    unsigned int seqNum = location.first;
    unsigned int seqPos = location.second;
    if (! dead_sequences.get(seqNum)) {
      for (unsigned int seq = 0 ; seq < n_seqs ; seq++) {
        if (seq == seqNum) continue;
        if (dead_sequences.get(seq)) continue;
        s.push(Literal(l._variable, getVal(seq,seqPos)));
      }
    }
    return dynamicStackToArgArray(s);
  }
  /// Compute symmetric literals
  template <>
  ArgArray<Literal>
  ValueSequenceSymmetryImp<BoolView>
  ::symmetric(Literal l, const ViewArray<BoolView>& x) const {
    (void) x;
    Region region;
    Support::DynamicStack<Literal,Region> s(region);
    std::pair<int,int> location = findVar(values, n_values, seq_size, l._value);
    if (location.first == -1) return dynamicStackToArgArray(s);
    unsigned int seqNum = location.first;
    unsigned int seqPos = location.second;
    if (! dead_sequences.get(seqNum)) {
      for (unsigned int seq = 0 ; seq < n_seqs ; seq++) {
        if (seq == seqNum) continue;
        if (dead_sequences.get(seq)) continue;
        s.push(Literal(l._variable, getVal(seq,seqPos)));
      }
    }
    return dynamicStackToArgArray(s);
  }

}}}

// STATISTICS: int-branch