/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library.

 *

 * Copyright (C) 2003-2009

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */

///\ingroup tools

///\file

///\brief DIMACS to LGF converter.

///

/// This program converts various DIMACS formats to the LEMON Digraph Format

/// (LGF).

///

/// See

/// \verbatim

///  dimacs-to-lgf --help

/// \endverbatim

/// for more info on usage.

///

#include <iostream>

#include <fstream>

#include <cstring>

#include <lemon/smart_graph.h>

#include <lemon/dimacs.h>

#include <lemon/lgf_writer.h>

#include <lemon/arg_parser.h>

#include <lemon/error.h>

using namespace std;

using namespace lemon;

int main(int argc, const char *argv[]) {

  typedef SmartDigraph Digraph;

  typedef Digraph::Arc Arc;

  typedef Digraph::Node Node;

  typedef Digraph::ArcIt ArcIt;

  typedef Digraph::NodeIt NodeIt;

  typedef Digraph::ArcMap<double> DoubleArcMap;

  typedef Digraph::NodeMap<double> DoubleNodeMap;

  std::string inputName;

  std::string outputName;

  ArgParser ap(argc, argv);

  ap.other("[INFILE [OUTFILE]]",

           "If either the INFILE or OUTFILE file is missing the standard\n"

           "     input/output will be used instead.")

    .run();

  ifstream input;

  ofstream output;

  switch(ap.files().size())

    {

    case 2:

      output.open(ap.files()[1].c_str());

      if (!output) {

        throw IoError("Cannot open the file for writing", ap.files()[1]);

      }

    case 1:

      input.open(ap.files()[0].c_str());

      if (!input) {

        throw IoError("File cannot be found", ap.files()[0]);

      }

    case 0:

      break;

    default:

      cerr << ap.commandName() << ": too many arguments\n";

      return 1;

  }

  istream& is = (ap.files().size()<1 ? cin : input);

  ostream& os = (ap.files().size()<2 ? cout : output);

  DimacsDescriptor desc = dimacsType(is);

  switch(desc.type)

    {

    case DimacsDescriptor::MIN:

      {

        Digraph digraph;

        DoubleArcMap lower(digraph), capacity(digraph), cost(digraph);

        DoubleNodeMap supply(digraph);

        readDimacsMin(is, digraph, lower, capacity, cost, supply, 0, desc);

        DigraphWriter<Digraph>(digraph, os).

          nodeMap("supply", supply).

          arcMap("lower", lower).

          arcMap("capacity", capacity).

          arcMap("cost", cost).

          attribute("problem","min").

          run();

      }

      break;

    case DimacsDescriptor::MAX:

      {

        Digraph digraph;

        Node s, t;

        DoubleArcMap capacity(digraph);

        readDimacsMax(is, digraph, capacity, s, t, 0, desc);

        DigraphWriter<Digraph>(digraph, os).

          arcMap("capacity", capacity).

          node("source", s).

          node("target", t).

          attribute("problem","max").

          run();

      }

      break;

    case DimacsDescriptor::SP:

      {

        Digraph digraph;

        Node s;

        DoubleArcMap capacity(digraph);

        readDimacsSp(is, digraph, capacity, s, desc);

        DigraphWriter<Digraph>(digraph, os).

          arcMap("capacity", capacity).

          node("source", s).

          attribute("problem","sp").

          run();

      }

      break;

    case DimacsDescriptor::MAT:

      {

        Digraph digraph;

        readDimacsMat(is, digraph,desc);

        DigraphWriter<Digraph>(digraph, os).

          attribute("problem","mat").

          run();

      }

      break;

    default:

      break;

    }

  return 0;

}