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

  *

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

  *

  * Copyright (C) 2003-2010

  * 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 <iostream>

 #include "test_tools.h"

 #include <lemon/list_graph.h>

 #include <lemon/circulation.h>

 #include <lemon/lgf_reader.h>

 #include <lemon/concepts/digraph.h>

 #include <lemon/concepts/maps.h>

 using namespace lemon;

 char test_lgf[] =

   "@nodes\n"

   "label\n"

   "0\n"

   "1\n"

   "2\n"

   "3\n"

   "4\n"

   "5\n"

   "@arcs\n"

   "     lcap  ucap\n"

   "0 1  2  10\n"

   "0 2  2  6\n"

   "1 3  4  7\n"

   "1 4  0  5\n"

   "2 4  1  3\n"

   "3 5  3  8\n"

   "4 5  3  7\n"

   "@attributes\n"

   "source 0\n"

   "sink   5\n";

 void checkCirculationCompile()

 {

   typedef int VType;

   typedef concepts::Digraph Digraph;

   typedef Digraph::Node Node;

   typedef Digraph::Arc Arc;

   typedef concepts::ReadMap<Arc,VType> CapMap;

   typedef concepts::ReadMap<Node,VType> SupplyMap;

   typedef concepts::ReadWriteMap<Arc,VType> FlowMap;

   typedef concepts::WriteMap<Node,bool> BarrierMap;

   typedef Elevator<Digraph, Digraph::Node> Elev;

   typedef LinkedElevator<Digraph, Digraph::Node> LinkedElev;

   Digraph g;

   Node n;

   Arc a;

   CapMap lcap, ucap;

   SupplyMap supply;

   FlowMap flow;

   BarrierMap bar;

   VType v;

   bool b;

   ignore_unused_variable_warning(v,b);

   typedef Circulation<Digraph, CapMap, CapMap, SupplyMap>

             ::SetFlowMap<FlowMap>

             ::SetElevator<Elev>

             ::SetStandardElevator<LinkedElev>

             ::Create CirculationType;

   CirculationType circ_test(g, lcap, ucap, supply);

   const CirculationType& const_circ_test = circ_test;

   circ_test

     .lowerMap(lcap)

     .upperMap(ucap)

     .supplyMap(supply)

     .flowMap(flow);

   const CirculationType::Elevator& elev = const_circ_test.elevator();

   circ_test.elevator(const_cast<CirculationType::Elevator&>(elev));

   CirculationType::Tolerance tol = const_circ_test.tolerance();

   circ_test.tolerance(tol);

   circ_test.init();

   circ_test.greedyInit();

   circ_test.start();

   circ_test.run();

   v = const_circ_test.flow(a);

   const FlowMap& fm = const_circ_test.flowMap();

   b = const_circ_test.barrier(n);

   const_circ_test.barrierMap(bar);

   ignore_unused_variable_warning(fm);

 }

 template <class G, class LM, class UM, class DM>

 void checkCirculation(const G& g, const LM& lm, const UM& um,

                       const DM& dm, bool find)

 {

   Circulation<G, LM, UM, DM> circ(g, lm, um, dm);

   bool ret = circ.run();

   if (find) {

     check(ret, "A feasible solution should have been found.");

     check(circ.checkFlow(), "The found flow is corrupt.");

     check(!circ.checkBarrier(), "A barrier should not have been found.");

   } else {

     check(!ret, "A feasible solution should not have been found.");

     check(circ.checkBarrier(), "The found barrier is corrupt.");

   }

 }

 int main (int, char*[])

 {

   typedef ListDigraph Digraph;

   DIGRAPH_TYPEDEFS(Digraph);

   Digraph g;

   IntArcMap lo(g), up(g);

   IntNodeMap delta(g, 0);

   Node s, t;

   std::istringstream input(test_lgf);

   DigraphReader<Digraph>(g,input).

     arcMap("lcap", lo).

     arcMap("ucap", up).

     node("source",s).

     node("sink",t).

     run();

   delta[s] = 7; delta[t] = -7;

   checkCirculation(g, lo, up, delta, true);

   delta[s] = 13; delta[t] = -13;

   checkCirculation(g, lo, up, delta, true);

   delta[s] = 6; delta[t] = -6;

   checkCirculation(g, lo, up, delta, false);

   delta[s] = 14; delta[t] = -14;

   checkCirculation(g, lo, up, delta, false);

   delta[s] = 7; delta[t] = -13;

   checkCirculation(g, lo, up, delta, true);

   delta[s] = 5; delta[t] = -15;

   checkCirculation(g, lo, up, delta, true);

   delta[s] = 10; delta[t] = -11;

   checkCirculation(g, lo, up, delta, true);

   delta[s] = 11; delta[t] = -10;

   checkCirculation(g, lo, up, delta, false);

   return 0;

 }