// -*- c++ -*-

#include <iostream>

#include <fstream>

#include <vector>

#include <cstdlib>

#include <list_graph.h>

//#include <smart_graph.h>

//#include <dimacs.h>

#include <time_measure.h>

#include <for_each_macros.h>

#include <bfs_iterator.h>

#include <bipartite_graph_wrapper.h>

#include <maps.h>

#include <max_flow.h>

/**

 * Inicializalja a veletlenszamgeneratort.

 * Figyelem, ez nem jo igazi random szamokhoz,

 * erre ne bizzad a titkaidat!

 */

void random_init()

{

	unsigned int seed = getpid();

	seed |= seed << 15;

	seed ^= time(0);

	srand(seed);

}

/**

 * Egy veletlen int-et ad vissza 0 es m-1 kozott.

 */

int random(int m)

{

  return int( double(m) * rand() / (RAND_MAX + 1.0) );

}

using namespace hugo;

int main() {

  //typedef UndirListGraph Graph; 

  typedef BipartiteGraph<ListGraph> Graph;

  typedef Graph::Node Node;

  typedef Graph::NodeIt NodeIt;

  typedef Graph::Edge Edge;

  typedef Graph::EdgeIt EdgeIt;

  typedef Graph::OutEdgeIt OutEdgeIt;

  Graph g;

  std::vector<Graph::Node> s_nodes;

  std::vector<Graph::Node> t_nodes;

  int a;

  std::cout << "number of nodes in the first color class=";

  std::cin >> a; 

  int b;

  std::cout << "number of nodes in the second color class=";

  std::cin >> b; 

  int m;

  std::cout << "number of edges=";

  std::cin >> m; 

  std::cout << "Generatig a random bipartite graph..." << std::endl;

  for (int i=0; i<a; ++i) s_nodes.push_back(g.addNode(false));

  for (int i=0; i<b; ++i) t_nodes.push_back(g.addNode(true));

  random_init();

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

    g.addEdge(s_nodes[random(a)], t_nodes[random(b)]);

  }

  std::cout << "Edges of the bipartite graph:" << std::endl;

  FOR_EACH_LOC(EdgeIt, e, g) std::cout << e << " ";

  std::cout << std::endl;

  std::cout << "Nodes in T:" << std::endl;

  FOR_EACH_INC_LOC(Graph::ClassNodeIt, v, g, g.T_CLASS) std::cout << v << " ";

  std::cout << std::endl;

  std::cout << "Nodes in S:" << std::endl;

  FOR_EACH_INC_LOC(Graph::ClassNodeIt, v, g, g.S_CLASS) std::cout << v << " ";

  std::cout << std::endl;

  std::cout << "Erasing the first node..." << std::endl;

  NodeIt n;

  g.first(n);

  g.erase(n);

  std::cout << "Nodes of the bipartite graph:" << std::endl;

  FOR_EACH_GLOB(n, g) std::cout << n << " ";

  std::cout << std::endl;

  std::cout << "Nodes in T:" << std::endl;

  FOR_EACH_INC_LOC(Graph::ClassNodeIt, v, g, g.T_CLASS) std::cout << v << " ";

  std::cout << std::endl;

  std::cout << "Nodes in S:" << std::endl;

  FOR_EACH_INC_LOC(Graph::ClassNodeIt, v, g, g.S_CLASS) std::cout << v << " ";

  std::cout << std::endl;

  typedef stGraphWrapper<Graph> stGW;

  stGW stgw(g);

  ConstMap<stGW::Edge, int> const1map(1);

  Timer ts;

  ts.reset();

  stGW::EdgeMap<int> flow(stgw);

  MaxFlow<stGW, int, ConstMap<stGW::Edge, int>, stGW::EdgeMap<int> > 

    max_flow_test(stgw, stgw.S_NODE, stgw.T_NODE, const1map, flow);

  max_flow_test.run();

//  while (max_flow_test.augmentOnShortestPath()) { }

//  typedef ListGraph MutableGraph;

//  while (max_flow_test.augmentOnBlockingFlow1<MutableGraph>()) {

//  while (max_flow_test.augmentOnBlockingFlow2()) {

//   std::cout << max_flow_test.flowValue() << std::endl;

//  }

  std::cout << "max flow value: " << max_flow_test.flowValue() << std::endl;

  std::cout << "elapsed time: " << ts << std::endl;

  FOR_EACH_LOC(stGW::EdgeIt, e, stgw) { 

    if (flow[e]) std::cout << e << std::endl; 

  }

  std::cout << std::endl;

  return 0;

}