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

  *

  * 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.

  *

  */

 #include <lemon/concepts/digraph.h>

 #include <lemon/smart_graph.h>

 #include <lemon/list_graph.h>

 #include <lemon/lgf_reader.h>

 #include <lemon/dijkstra.h>

 #include <lemon/path.h>

 #include "graph_test.h"

 #include "test_tools.h"

 using namespace lemon;

 char test_lgf[] =

   "@nodes\n"

   "label\n"

   "0\n"

   "1\n"

   "2\n"

   "3\n"

   "4\n"

   "@arcs\n"

   "     label length\n"

   "0 1  0     1\n"

   "1 2  1     1\n"

   "2 3  2     1\n"

   "0 3  4     5\n"

   "0 3  5     10\n"

   "0 3  6     7\n"

   "4 2  7     1\n"

   "@attributes\n"

   "source 0\n"

   "target 3\n";

 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);

   std::istringstream input(test_lgf);

   digraphReader(input, G).

     arcMap("length", length).

     node("source", s).

     node("target", t).

     run();

   Dijkstra<Digraph, LengthMap>

         dijkstra_test(G, length);

   dijkstra_test.run(s);

   check(dijkstra_test.dist(t)==3,"Dijkstra found a wrong path.");

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

   check(p.length()==3,"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) {

     if (dijkstra_test.reached(v)) {

       check(v==s || dijkstra_test.predArc(v)!=INVALID, "Wrong tree.");

       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;

 }