/* -*- C++ -*-

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

 *

 * Copyright (C) 2004 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/skeletons/graph.h>

using namespace lemon;

const int PET_SIZE =5;

void check_Bfs_Compile() 

{

  typedef skeleton::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.tail(e);

    Node v=G.head(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.tail(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));

    }

  }

}