/* -*- C++ -*-

 *

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

 *

 * Copyright (C) 2003-2008

 * 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 Demonstrating graph input and output

///

/// This simple demo program gives an example of how to read and write

/// a graph and additional maps (on the nodes or the edges) from/to a

/// stream. 

///

/// \include reader_writer_demo.cc

#include <iostream>

#include <lemon/smart_graph.h>

#include <lemon/lgf_reader.h>

#include <lemon/lgf_writer.h>

#include <lemon/random.h>

using namespace lemon;

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

  const int n = argc > 1 ? std::atoi(argv[1]) : 20;

  const int e = argc > 2 ? std::atoi(argv[2]) : static_cast<int>(n * std::log(double(n)));

  const int m = argc > 3 ? std::atoi(argv[3]) : 100;

  SmartDigraph digraph;

  std::stringstream ss;

  try {

    typedef SmartDigraph Digraph;

    typedef Digraph::Node Node;

    typedef Digraph::Arc Arc;

    typedef Digraph::ArcIt ArcIt;

    typedef Digraph::NodeMap<int> PotentialMap;

    typedef Digraph::ArcMap<int> CapacityMap;

    typedef Digraph::ArcMap<std::string> NameMap;

    Digraph digraph;

    PotentialMap potential(digraph);

    CapacityMap capacity(digraph);

    NameMap name(digraph);

    std::vector<Node> nodes;

    for (int i = 0; i < n; ++i) {

      Node node = digraph.addNode();

      potential[node] = rnd[m];

      nodes.push_back(node);

    }

    std::vector<Arc> arcs;

    for (int i = 0; i < e; ++i) {

      int s = rnd[n];

      int t = rnd[n];

      int c = rnd[m];

      Arc arc = digraph.addArc(nodes[s], nodes[t]);

      capacity[arc] = c;

      std::ostringstream os;

      os << "arc \t" << i << std::endl;

      name[arc] = os.str();

      arcs.push_back(arc);

    }

    DigraphWriter<Digraph>(ss, digraph).

      nodeMap("potential", potential).

      arcMap("capacity", capacity).

      arcMap("name", name).

      node("source", nodes[0]).

      node("target", nodes[1]).

      arc("bottleneck", arcs[e / 2]).

      attribute("creator", "lemon library").

      run();

  } catch (DataFormatError& error) {

    std::cerr << error.what() << std::endl;

  }

  try {

    typedef SmartDigraph Digraph;

    typedef Digraph::Node Node;

    typedef Digraph::Arc Arc;

    typedef Digraph::ArcIt ArcIt;

    typedef Digraph::NodeMap<int> LabelMap;

    typedef Digraph::NodeMap<int> PotentialMap;

    typedef Digraph::ArcMap<int> CapacityMap;

    typedef Digraph::ArcMap<std::string> NameMap;

    Digraph digraph;

    LabelMap label(digraph);

    PotentialMap potential(digraph);

    CapacityMap capacity(digraph);

    NameMap name(digraph);

    Node s, t;

    Arc a;

    std::string creator;

    for (int i = 0; i < n; ++i) {

      Node node = digraph.addNode();

      label[node] = i;

    }

    DigraphReader<Digraph>(ss, digraph).

      useNodes(label).

      nodeMap("potential", potential).

      arcMap("capacity", capacity).

      arcMap("name", name).

      node("source", s).

      node("target", t).

      arc("bottleneck", a).

      attribute("creator", creator).

      run();

    DigraphWriter<Digraph>(std::cout, digraph).

      nodeMap("potential", potential).

      arcMap("capacity", capacity).

      arcMap("name", name).

      node("source", s).

      node("target", t).

      arc("bottleneck", a).

      attribute("creator", creator).

      run();

  } catch (DataFormatError& error) {

    std::cerr << error.what() << std::endl;

  }

  return 0;

}