/* -*- 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 <sstream>

#include <lemon/smart_graph.h>

#include <lemon/adaptors.h>

#include <lemon/concepts/graph.h>

#include <lemon/concepts/maps.h>

#include <lemon/lgf_reader.h>

#include <lemon/nagamochi_ibaraki.h>

#include "test_tools.h"

using namespace lemon;

using namespace std;

const std::string lgf =

  "@nodes\n"

  "label\n"

  "0\n"

  "1\n"

  "2\n"

  "3\n"

  "4\n"

  "5\n"

  "@edges\n"

  "     cap1 cap2 cap3\n"

  "0 1  1    1    1   \n"

  "0 2  2    2    4   \n"

  "1 2  4    4    4   \n"

  "3 4  1    1    1   \n"

  "3 5  2    2    4   \n"

  "4 5  4    4    4   \n"

  "2 3  1    6    6   \n";

void checkNagamochiIbarakiCompile()

{

  typedef int Value;

  typedef concepts::Graph Graph;

  typedef Graph::Node Node;

  typedef Graph::Edge Edge;

  typedef concepts::ReadMap<Edge, Value> CapMap;

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

  Graph g;

  Node n;

  CapMap cap;

  CutMap cut;

  Value v;

  bool b;

  ignore_unused_variable_warning(v,b);

  NagamochiIbaraki<Graph, CapMap> ni_test(g, cap);

  const NagamochiIbaraki<Graph, CapMap>& const_ni_test = ni_test;

  ni_test.init();

  ni_test.start();

  b = ni_test.processNextPhase();

  ni_test.run();

  v = const_ni_test.minCutValue();

  v = const_ni_test.minCutMap(cut);

}

template <typename Graph, typename CapMap, typename CutMap>

typename CapMap::Value

  cutValue(const Graph& graph, const CapMap& cap, const CutMap& cut)

{

  typename CapMap::Value sum = 0;

  for (typename Graph::EdgeIt e(graph); e != INVALID; ++e) {

    if (cut[graph.u(e)] != cut[graph.v(e)]) {

      sum += cap[e];

    }

  }

  return sum;

}

int main() {

  SmartGraph graph;

  SmartGraph::EdgeMap<int> cap1(graph), cap2(graph), cap3(graph);

  SmartGraph::NodeMap<bool> cut(graph);

  istringstream input(lgf);

  graphReader(graph, input)

    .edgeMap("cap1", cap1)

    .edgeMap("cap2", cap2)

    .edgeMap("cap3", cap3)

    .run();

  {

    NagamochiIbaraki<SmartGraph> ni(graph, cap1);

    ni.run();

    ni.minCutMap(cut);

    check(ni.minCutValue() == 1, "Wrong cut value");

    check(ni.minCutValue() == cutValue(graph, cap1, cut), "Wrong cut value");

  }

  {

    NagamochiIbaraki<SmartGraph> ni(graph, cap2);

    ni.run();

    ni.minCutMap(cut);

    check(ni.minCutValue() == 3, "Wrong cut value");

    check(ni.minCutValue() == cutValue(graph, cap2, cut), "Wrong cut value");

  }

  {

    NagamochiIbaraki<SmartGraph> ni(graph, cap3);

    ni.run();

    ni.minCutMap(cut);

    check(ni.minCutValue() == 5, "Wrong cut value");

    check(ni.minCutValue() == cutValue(graph, cap3, cut), "Wrong cut value");

  }

  {

    NagamochiIbaraki<SmartGraph>::SetUnitCapacity::Create ni(graph);

    ni.run();

    ni.minCutMap(cut);

    ConstMap<SmartGraph::Edge, int> cap4(1);

    check(ni.minCutValue() == 1, "Wrong cut value");

    check(ni.minCutValue() == cutValue(graph, cap4, cut), "Wrong cut value");

  }

  return 0;

}