/* -*- C++ -*-

 *

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

 *

 * Copyright (C) 2003-2007

 * 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 demos

///\file

///\brief DIMACS to LGF converter.

///

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

/// (LGF).

///

/// \include dim_to_lgf.cc

#include <iostream>

#include <fstream>

#include <cstring>

#include <lemon/smart_graph.h>

#include <lemon/dimacs.h>

#include <lemon/graph_writer.h>

#include <lemon/arg_parser.h>

using namespace std;

using namespace lemon;

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

  typedef SmartGraph Graph;

  typedef Graph::Edge Edge;

  typedef Graph::Node Node;

  typedef Graph::EdgeIt EdgeIt;

  typedef Graph::NodeIt NodeIt;

  typedef Graph::EdgeMap<double> DoubleMap;

  std::string inputName;

  std::string outputName;

  std::string typeName;

  bool mincostflow;

  bool maxflow;

  bool shortestpath;

  bool capacitated;

  bool plain;

  bool version;

  ArgParser ap(argc, argv);

  ap.refOption("-input", 

               "use FILE as input instead of standard input", 

               inputName).synonym("i", "-input")

    .refOption("-output", 

               "use FILE as output instead of standard output", 

               outputName).synonym("o", "-output")

    .refOption("-mincostflow", 

               "set the type of the graph to \"mincostflow\" graph", 

               mincostflow)

    .optionGroup("type", "-mincostflow").synonym("mcf", "-mincostflow")

    .refOption("-maxflow", 

               "set the type of the graph to \"maxflow\" graph", 

               maxflow)

    .optionGroup("type", "-maxflow").synonym("mf", "-maxflow")

    .refOption("-shortestpath", 

               "set the type of the graph to \"shortestpath\" graph", 

               shortestpath)

    .optionGroup("type", "-shortestpath").synonym("sp", "-shortestpath")

    .refOption("-capacitated", 

               "set the type of the graph to \"capacitated\" graph", 

               capacitated)

    .optionGroup("type", "-capacitated").synonym("cap", "-capacitated")

    .refOption("-plain", 

               "set the type of the graph to \"plain\" graph", 

               plain)

    .optionGroup("type", "-plain").synonym("pl", "-plain")

    .onlyOneGroup("type")

    .mandatoryGroup("type")

    .refOption("-version", "show version information", version)

    .synonym("v", "-version")

    .run();

  ifstream input;

  if (!inputName.empty()) {

    input.open(inputName.c_str());

    if (!input) {

      cerr << "File open error" << endl;

      return -1;

    }

  }

  istream& is = (inputName.empty() ? cin : input);

  ofstream output;

  if (!outputName.empty()) {

    output.open(outputName.c_str());

    if (!output) {

      cerr << "File open error" << endl;

      return -1;

    }

  }

  ostream& os = (outputName.empty() ? cout : output);

  if (mincostflow) {

    Graph graph;

    Node s, t;

    DoubleMap cost(graph), capacity(graph);

    readDimacs(is, graph, capacity, s, t, cost);

    GraphWriter<Graph>(os, graph).

      writeEdgeMap("capacity", capacity).

      writeNode("source", s).

      writeNode("target", t).

      writeEdgeMap("cost", cost).

      run();

  } else if (maxflow) {

    Graph graph;

    Node s, t;

    DoubleMap capacity(graph);

    readDimacs(is, graph, capacity, s, t);

    GraphWriter<Graph>(os, graph).

      writeEdgeMap("capacity", capacity).

      writeNode("source", s).

      writeNode("target", t).

      run();

  } else if (shortestpath) {

    Graph graph;

    Node s;

    DoubleMap capacity(graph);

    readDimacs(is, graph, capacity, s);

    GraphWriter<Graph>(os, graph).

      writeEdgeMap("capacity", capacity).

      writeNode("source", s).

      run();

  } else if (capacitated) {

    Graph graph;

    DoubleMap capacity(graph);

    readDimacs(is, graph, capacity);

    GraphWriter<Graph>(os, graph).

      writeEdgeMap("capacity", capacity).

      run();

  } else if (plain) {

    Graph graph;

    readDimacs(is, graph);

    GraphWriter<Graph>(os, graph).run();

  } else {

    cerr << "Invalid type error" << endl;

    return -1;

  }

  return 0;

}