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

 *

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

 *

 * Copyright (C) 2003-2009

 * 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);

  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;

}