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

  *

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

  *

  * Copyright (C) 2003-2011

  * 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.

  *

  */

 #include <lemon/euler.h>

 #include <lemon/list_graph.h>

 #include <lemon/adaptors.h>

 #include "test_tools.h"

 using namespace lemon;

 template <typename Digraph>

 void checkDiEulerIt(const Digraph& g,

                     const typename Digraph::Node& start = INVALID)

 {

   typename Digraph::template ArcMap<int> visitationNumber(g, 0);

   DiEulerIt<Digraph> e(g, start);

   if (e == INVALID) return;

   typename Digraph::Node firstNode = g.source(e);

   typename Digraph::Node lastNode = g.target(e);

   if (start != INVALID) {

     check(firstNode == start, "checkDiEulerIt: Wrong first node");

   }

   for (; e != INVALID; ++e) {

     if (e != INVALID) lastNode = g.target(e);

     ++visitationNumber[e];

   }

   check(firstNode == lastNode,

       "checkDiEulerIt: First and last nodes are not the same");

   for (typename Digraph::ArcIt a(g); a != INVALID; ++a)

   {

     check(visitationNumber[a] == 1,

         "checkDiEulerIt: Not visited or multiple times visited arc found");

   }

 }

 template <typename Graph>

 void checkEulerIt(const Graph& g,

                   const typename Graph::Node& start = INVALID)

 {

   typename Graph::template EdgeMap<int> visitationNumber(g, 0);

   EulerIt<Graph> e(g, start);

   if (e == INVALID) return;

   typename Graph::Node firstNode = g.source(typename Graph::Arc(e));

   typename Graph::Node lastNode = g.target(typename Graph::Arc(e));

   if (start != INVALID) {

     check(firstNode == start, "checkEulerIt: Wrong first node");

   }

   for (; e != INVALID; ++e) {

     if (e != INVALID) lastNode = g.target(typename Graph::Arc(e));

     ++visitationNumber[e];

   }

   check(firstNode == lastNode,

       "checkEulerIt: First and last nodes are not the same");

   for (typename Graph::EdgeIt e(g); e != INVALID; ++e)

   {

     check(visitationNumber[e] == 1,

         "checkEulerIt: Not visited or multiple times visited edge found");

   }

 }

 int main()

 {

   typedef ListDigraph Digraph;

   typedef Undirector<Digraph> Graph;

   {

     Digraph d;

     Graph g(d);

     checkDiEulerIt(d);

     checkDiEulerIt(g);

     checkEulerIt(g);

     check(eulerian(d), "This graph is Eulerian");

     check(eulerian(g), "This graph is Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n = d.addNode();

     ::lemon::ignore_unused_variable_warning(n);

     checkDiEulerIt(d);

     checkDiEulerIt(g);

     checkEulerIt(g);

     check(eulerian(d), "This graph is Eulerian");

     check(eulerian(g), "This graph is Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n = d.addNode();

     d.addArc(n, n);

     checkDiEulerIt(d);

     checkDiEulerIt(g);

     checkEulerIt(g);

     check(eulerian(d), "This graph is Eulerian");

     check(eulerian(g), "This graph is Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n1 = d.addNode();

     Digraph::Node n2 = d.addNode();

     Digraph::Node n3 = d.addNode();

     d.addArc(n1, n2);

     d.addArc(n2, n1);

     d.addArc(n2, n3);

     d.addArc(n3, n2);

     checkDiEulerIt(d);

     checkDiEulerIt(d, n2);

     checkDiEulerIt(g);

     checkDiEulerIt(g, n2);

     checkEulerIt(g);

     checkEulerIt(g, n2);

     check(eulerian(d), "This graph is Eulerian");

     check(eulerian(g), "This graph is Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n1 = d.addNode();

     Digraph::Node n2 = d.addNode();

     Digraph::Node n3 = d.addNode();

     Digraph::Node n4 = d.addNode();

     Digraph::Node n5 = d.addNode();

     Digraph::Node n6 = d.addNode();

     d.addArc(n1, n2);

     d.addArc(n2, n4);

     d.addArc(n1, n3);

     d.addArc(n3, n4);

     d.addArc(n4, n1);

     d.addArc(n3, n5);

     d.addArc(n5, n2);

     d.addArc(n4, n6);

     d.addArc(n2, n6);

     d.addArc(n6, n1);

     d.addArc(n6, n3);

     checkDiEulerIt(d);

     checkDiEulerIt(d, n1);

     checkDiEulerIt(d, n5);

     checkDiEulerIt(g);

     checkDiEulerIt(g, n1);

     checkDiEulerIt(g, n5);

     checkEulerIt(g);

     checkEulerIt(g, n1);

     checkEulerIt(g, n5);

     check(eulerian(d), "This graph is Eulerian");

     check(eulerian(g), "This graph is Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n0 = d.addNode();

     Digraph::Node n1 = d.addNode();

     Digraph::Node n2 = d.addNode();

     Digraph::Node n3 = d.addNode();

     Digraph::Node n4 = d.addNode();

     Digraph::Node n5 = d.addNode();

     ::lemon::ignore_unused_variable_warning(n0,n4,n5);

     d.addArc(n1, n2);

     d.addArc(n2, n3);

     d.addArc(n3, n1);

     checkDiEulerIt(d);

     checkDiEulerIt(d, n2);

     checkDiEulerIt(g);

     checkDiEulerIt(g, n2);

     checkEulerIt(g);

     checkEulerIt(g, n2);

     check(!eulerian(d), "This graph is not Eulerian");

     check(!eulerian(g), "This graph is not Eulerian");

   }

   {

     Digraph d;

     Graph g(d);

     Digraph::Node n1 = d.addNode();

     Digraph::Node n2 = d.addNode();

     Digraph::Node n3 = d.addNode();

     d.addArc(n1, n2);

     d.addArc(n2, n3);

     check(!eulerian(d), "This graph is not Eulerian");

     check(!eulerian(g), "This graph is not Eulerian");

   }

   return 0;

 }