/* -*- C++ -*-

  *

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

  *

  * Copyright (C) 2003-2008

  * 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.

  *

  */

 ///\file

 ///\brief Test cases for Dijkstra algorithm.

 #include <lemon/concepts/digraph.h>

 #include <lemon/smart_graph.h>

 #include <lemon/list_graph.h>

 #include <lemon/graph_utils.h>

 #include <lemon/dijkstra.h>

 #include <lemon/path.h>

 #include "test_tools.h"

 using namespace lemon;

 void checkDijkstraCompile() 

 {

   typedef int VType;

   typedef concepts::Digraph Digraph;

   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;

   typedef Dijkstra<Digraph, LengthMap> DType;

   Digraph G;

   Digraph::Node n;

   Digraph::Arc e;

   VType l;

   bool b;

   DType::DistMap d(G);

   DType::PredMap p(G);

   //  DType::PredNodeMap pn(G);

   LengthMap length;

   DType dijkstra_test(G,length);

   dijkstra_test.run(n);

   l  = dijkstra_test.dist(n);

   e  = dijkstra_test.predArc(n);

   n  = dijkstra_test.predNode(n);

   d  = dijkstra_test.distMap();

   p  = dijkstra_test.predMap();

   //  pn = dijkstra_test.predNodeMap();

   b  = dijkstra_test.reached(n);

   Path<Digraph> pp = dijkstra_test.path(n);

 }

 void checkDijkstraFunctionCompile() 

 {

   typedef int VType;

   typedef concepts::Digraph Digraph;

   typedef Digraph::Arc Arc;

   typedef Digraph::Node Node;

   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;

   Digraph g;

   dijkstra(g,LengthMap(),Node()).run();

   dijkstra(g,LengthMap()).source(Node()).run();

   dijkstra(g,LengthMap())

     .predMap(concepts::WriteMap<Node,Arc>())

     .distMap(concepts::WriteMap<Node,VType>())

     .run(Node());

 }

 template <class Digraph>

 void checkDijkstra() {    

   TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);

   typedef typename Digraph::template ArcMap<int> LengthMap;

   Digraph G;

   Node s, t;

   LengthMap length(G);

   PetStruct<Digraph> ps = addPetersen(G, 5);

   for(int i=0;i<5;i++) {

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

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

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

   }

   s=ps.outer[0];

   t=ps.inner[1];

   Dijkstra<Digraph, LengthMap> 

 	dijkstra_test(G, length);

   dijkstra_test.run(s);

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

   Path<Digraph> p = dijkstra_test.path(t);

   check(p.length()==4,"getPath() found a wrong path.");

   check(checkPath(G, p),"path() found a wrong path.");

   check(pathSource(G, p) == s,"path() found a wrong path.");

   check(pathTarget(G, p) == t,"path() found a wrong path.");

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

     Node u=G.source(e);

     Node v=G.target(e);

     check( !dijkstra_test.reached(u) || (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= length[e]),

 	   "dist(target)-dist(source)-arc_length= " << dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e]);

   }

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

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

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

       Arc e=dijkstra_test.predArc(v);

       Node u=G.source(e);

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

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

 	    "Wrong distance! Difference: " << std::abs(dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e]));

     }

   }

   {

     NullMap<Node,Arc> myPredMap;

     dijkstra(G,length).predMap(myPredMap).run(s);

   }

 }

 int main() {

   checkDijkstra<ListDigraph>();

   checkDijkstra<SmartDigraph>();

   return 0;

 }