/* -*- 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 problem solver.

 ///

 /// This program solves various problems given in DIMACS format.

 ///

 /// See

 /// \code

 ///   dimacs-solver --help

 /// \endcode

 /// 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/time_measure.h>

 #include <lemon/arg_parser.h>

 #include <lemon/error.h>

 #include <lemon/dijkstra.h>

 #include <lemon/preflow.h>

 #include <lemon/matching.h>

 #include <lemon/network_simplex.h>

 using namespace lemon;

 typedef SmartDigraph Digraph;

 DIGRAPH_TYPEDEFS(Digraph);

 typedef SmartGraph Graph;

 template<class Value>

 void solve_sp(ArgParser &ap, std::istream &is, std::ostream &,

               DimacsDescriptor &desc)

 {

   bool report = !ap.given("q");

   Digraph g;

   Node s;

   Digraph::ArcMap<Value> len(g);

   Timer t;

   t.restart();

   readDimacsSp(is, g, len, s, desc);

   if(report) std::cerr << "Read the file: " << t << '\n';

   t.restart();

   Dijkstra<Digraph, Digraph::ArcMap<Value> > dij(g,len);

   if(report) std::cerr << "Setup Dijkstra class: " << t << '\n';

   t.restart();

   dij.run(s);

   if(report) std::cerr << "Run Dijkstra: " << t << '\n';

 }

 template<class Value>

 void solve_max(ArgParser &ap, std::istream &is, std::ostream &,

                Value infty, DimacsDescriptor &desc)

 {

   bool report = !ap.given("q");

   Digraph g;

   Node s,t;

   Digraph::ArcMap<Value> cap(g);

   Timer ti;

   ti.restart();

   readDimacsMax(is, g, cap, s, t, infty, desc);

   if(report) std::cerr << "Read the file: " << ti << '\n';

   ti.restart();

   Preflow<Digraph, Digraph::ArcMap<Value> > pre(g,cap,s,t);

   if(report) std::cerr << "Setup Preflow class: " << ti << '\n';

   ti.restart();

   pre.run();

   if(report) std::cerr << "Run Preflow: " << ti << '\n';

   if(report) std::cerr << "\nMax flow value: " << pre.flowValue() << '\n';  

 }

 template<class Value>

 void solve_min(ArgParser &ap, std::istream &is, std::ostream &,

                Value infty, DimacsDescriptor &desc)

 {

   bool report = !ap.given("q");

   Digraph g;

   Digraph::ArcMap<Value> lower(g), cap(g), cost(g);

   Digraph::NodeMap<Value> sup(g);

   Timer ti;

   ti.restart();

   readDimacsMin(is, g, lower, cap, cost, sup, infty, desc);

   ti.stop();

   Value sum_sup = 0;

   for (Digraph::NodeIt n(g); n != INVALID; ++n) {

     sum_sup += sup[n];

   }

   if (report) {

     std::cerr << "Sum of supply values: " << sum_sup << "\n";

     if (sum_sup <= 0)

       std::cerr << "GEQ supply contraints are used for NetworkSimplex\n\n";

     else

       std::cerr << "LEQ supply contraints are used for NetworkSimplex\n\n";

   }

   if (report) std::cerr << "Read the file: " << ti << '\n';

   ti.restart();

   NetworkSimplex<Digraph, Value> ns(g);

   ns.lowerMap(lower).capacityMap(cap).costMap(cost).supplyMap(sup);

   if (sum_sup > 0) ns.problemType(ns.LEQ);

   if (report) std::cerr << "Setup NetworkSimplex class: " << ti << '\n';

   ti.restart();

   bool res = ns.run();

   if (report) {

     std::cerr << "Run NetworkSimplex: " << ti << "\n\n";

     std::cerr << "Feasible flow: " << (res ? "found" : "not found") << '\n';

     if (res) std::cerr << "Min flow cost: " << ns.totalCost() << '\n';

   }

 }

 void solve_mat(ArgParser &ap, std::istream &is, std::ostream &,

               DimacsDescriptor &desc)

 {

   bool report = !ap.given("q");

   Graph g;

   Timer ti;

   ti.restart();

   readDimacsMat(is, g, desc);

   if(report) std::cerr << "Read the file: " << ti << '\n';

   ti.restart();

   MaxMatching<Graph> mat(g);

   if(report) std::cerr << "Setup MaxMatching class: " << ti << '\n';

   ti.restart();

   mat.run();

   if(report) std::cerr << "Run MaxMatching: " << ti << '\n';

   if(report) std::cerr << "\nCardinality of max matching: "

                        << mat.matchingSize() << '\n';  

 }

 template<class Value>

 void solve(ArgParser &ap, std::istream &is, std::ostream &os,

            DimacsDescriptor &desc)

 {

   std::stringstream iss(static_cast<std::string>(ap["infcap"]));

   Value infty;

   iss >> infty;

   if(iss.fail())

     {

       std::cerr << "Cannot interpret '"

                 << static_cast<std::string>(ap["infcap"]) << "' as infinite"

                 << std::endl;

       exit(1);

     }

   switch(desc.type)

     {

     case DimacsDescriptor::MIN:

       solve_min<Value>(ap,is,os,infty,desc);

       break;

     case DimacsDescriptor::MAX:

       solve_max<Value>(ap,is,os,infty,desc);

       break;

     case DimacsDescriptor::SP:

       solve_sp<Value>(ap,is,os,desc);

       break;

     case DimacsDescriptor::MAT:

       solve_mat(ap,is,os,desc);

       break;

     default:

       break;

     }

 }

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

   typedef SmartDigraph Digraph;

   typedef Digraph::Arc Arc;

   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.")

     .boolOption("q", "Do not print any report")

     .boolOption("int","Use 'int' for capacities, costs etc. (default)")

     .optionGroup("datatype","int")

 #ifdef HAVE_LONG_LONG

     .boolOption("long","Use 'long long' for capacities, costs etc.")

     .optionGroup("datatype","long")

 #endif

     .boolOption("double","Use 'double' for capacities, costs etc.")

     .optionGroup("datatype","double")

     .boolOption("ldouble","Use 'long double' for capacities, costs etc.")

     .optionGroup("datatype","ldouble")

     .onlyOneGroup("datatype")

     .stringOption("infcap","Value used for 'very high' capacities","0")

     .run();

   std::ifstream input;

   std::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:

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

       return 1;

     }

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

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

   DimacsDescriptor desc = dimacsType(is);

   if(!ap.given("q"))

     {

       std::cout << "Problem type: ";

       switch(desc.type)

         {

         case DimacsDescriptor::MIN:

           std::cout << "min";

           break;

         case DimacsDescriptor::MAX:

           std::cout << "max";

           break;

         case DimacsDescriptor::SP:

           std::cout << "sp";

         case DimacsDescriptor::MAT:

           std::cout << "mat";

           break;

         default:

           exit(1);

           break;

         }

       std::cout << "\nNum of nodes: " << desc.nodeNum;

       std::cout << "\nNum of arcs:  " << desc.edgeNum;

       std::cout << "\n\n";

     }

   if(ap.given("double"))

     solve<double>(ap,is,os,desc);

   else if(ap.given("ldouble"))

     solve<long double>(ap,is,os,desc);

 #ifdef HAVE_LONG_LONG

   else if(ap.given("long"))

     solve<long long>(ap,is,os,desc);

 #endif

   else solve<int>(ap,is,os,desc);

   return 0;

 }