/* -*- C++ -*-

  * src/test/bfs_test.cc - Part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Combinatorial Optimization Research Group, 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 "test_tools.h"

 #include <lemon/smart_graph.h>

 #include <lemon/bfs.h>

 #include<lemon/concept/graph.h>

 using namespace lemon;

 const int PET_SIZE =5;

 void check_Bfs_Compile() 

 {

   typedef concept::StaticGraph Graph;

   typedef Graph::Edge Edge;

   typedef Graph::Node Node;

   typedef Graph::EdgeIt EdgeIt;

   typedef Graph::NodeIt NodeIt;

   typedef Bfs<Graph> BType;

   Graph G;

   Node n;

   Edge e;

   int l;

   bool b;

   BType::DistMap d(G);

   BType::PredMap p(G);

   BType::PredNodeMap pn(G);

   BType bfs_test(G);

   bfs_test.run(n);

   l  = bfs_test.dist(n);

   e  = bfs_test.pred(n);

   n  = bfs_test.predNode(n);

   d  = bfs_test.distMap();

   p  = bfs_test.predMap();

   pn = bfs_test.predNodeMap();

   b  = bfs_test.reached(n);

 }

 int main()

 {

   typedef SmartGraph Graph;

   typedef Graph::Edge Edge;

   typedef Graph::Node Node;

   typedef Graph::EdgeIt EdgeIt;

   typedef Graph::NodeIt NodeIt;

   typedef Graph::EdgeMap<int> LengthMap;

   Graph G;

   Node s, t;

   PetStruct<Graph> ps = addPetersen(G,PET_SIZE);

   s=ps.outer[2];

   t=ps.inner[0];

   Bfs<Graph> bfs_test(G);

   bfs_test.run(s);

   check(bfs_test.dist(t)==3,"Bfs found a wrong path. " << bfs_test.dist(t));

   for(EdgeIt e(G); e==INVALID; ++e) {

     Node u=G.source(e);

     Node v=G.target(e);

     check( !bfs_test.reached(u) ||

 	   (bfs_test.dist(v) > bfs_test.dist(u)+1),

 	   "Wrong output.");

   }

   for(NodeIt v(G); v==INVALID; ++v) {

     check(bfs_test.reached(v),"Each node should be reached.");

     if ( bfs_test.pred(v)!=INVALID ) {

       Edge e=bfs_test.pred(v);

       Node u=G.source(e);

       check(u==bfs_test.predNode(v),"Wrong tree.");

       check(bfs_test.dist(v) - bfs_test.dist(u) == 1,

 	    "Wrong distance. Difference: " 

 	    << std::abs(bfs_test.dist(v) - bfs_test.dist(u) 

 			- 1));

     }

   }

 }