/* -*- C++ -*-

 * src/test/dijkstra_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/dijkstra.h>

#include <lemon/concept/graph.h>

#include <lemon/concept/maps.h>

using namespace lemon;

const int PET_SIZE =5;

void check_Dijkstra_BinHeap_Compile() 

{

  typedef int VType;

  typedef concept::StaticGraph Graph;

  typedef Graph::Edge Edge;

  typedef Graph::Node Node;

  typedef Graph::EdgeIt EdgeIt;

  typedef Graph::NodeIt NodeIt;

  typedef concept::ReadMap<Edge,VType> LengthMap;

  typedef Dijkstra<Graph, LengthMap> DType;

  Graph G;

  Node n;

  Edge e;

  VType l;

  bool b;

  DType::DistMap d(G);

  DType::PredMap p(G);

  DType::PredNodeMap pn(G);

  LengthMap cap;

  DType dijkstra_test(G,cap);

  dijkstra_test.run(n);

  l  = dijkstra_test.dist(n);

  e  = dijkstra_test.pred(n);

  n  = dijkstra_test.predNode(n);

  d  = dijkstra_test.distMap();

  p  = dijkstra_test.predMap();

  pn = dijkstra_test.predNodeMap();

  b  = dijkstra_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;

  LengthMap cap(G);

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

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

    cap[ps.outcir[i]]=4;

    cap[ps.incir[i]]=1;

    cap[ps.chords[i]]=10;

  }

  s=ps.outer[0];

  t=ps.inner[1];

  Dijkstra<Graph, LengthMap> 

	dijkstra_test(G, cap);

  dijkstra_test.run(s);

  check(dijkstra_test.dist(t)==13,"Dijkstra found a wrong path.");

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

    Node u=G.tail(e);

    Node v=G.head(e);

    check( !dijkstra_test.reached(u) ||

	   (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= cap[e]),

	   "dist(head)-dist(tail)- edge_length= " 

	   << dijkstra_test.dist(v) - dijkstra_test.dist(u) 

	   - cap[e]);

  }

  ///\bug This works only for integer lengths

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

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

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

      Edge e=dijkstra_test.pred(v);

      Node u=G.tail(e);

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

      check(dijkstra_test.dist(v) - dijkstra_test.dist(u) == cap[e],

	    "Wrong distance! Difference: " 

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

			    - cap[e]));

    }

  }

}