/* -*- C++ -*-

 * test/test_tools.h - Part of LEMON, a generic C++ optimization library

 *

 * Copyright (C) 2005 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.

 *

 */

#ifndef LEMON_TEST_TEST_TOOLS_H

#define LEMON_TEST_TEST_TOOLS_H

#include <iostream>

#include <vector>

#include <cstdlib>

#include <ctime>

#include <lemon/invalid.h>

#include <lemon/concept_check.h>

using namespace lemon;

//! \ingroup misc

//! \file

//! \brief Some utilities to write test programs.

///If \c rc is fail, writes an error message end exit.

///If \c rc is fail, writes an error message end exit.

///The error message contains the file name and the line number of the

///source code in a standard from, which makes it possible to go there

///using good source browsers like e.g. \c emacs.

///

///For example

///\code check(0==1,"This is obviously false.");\endcode will

///print this (and then exits).

///\verbatim graph_test.cc:123: error: This is obviously false. \endverbatim

///

///\todo It should be in \c error.h

#define check(rc, msg) \

  if(!(rc)) { \

    std::cerr << __FILE__ ":" << __LINE__ << ": error: " << msg << std::endl; \

    exit(1); \

  } else { } \

///Structure returned by \ref addPetersen().

///Structure returned by \ref addPetersen().

///

template<class Graph> struct PetStruct

{

  ///Vector containing the outer nodes.

  std::vector<typename Graph::Node> outer;

  ///Vector containing the inner nodes.

  std::vector<typename Graph::Node> inner;

  ///Vector containing the edges of the inner circle.

  std::vector<typename Graph::Edge> incir;

  ///Vector containing the edges of the outer circle.

  std::vector<typename Graph::Edge> outcir;

  ///Vector containing the chord edges.

  std::vector<typename Graph::Edge> chords;

};

///Adds a Petersen graph to \c G.

///Adds a Petersen graph to \c G.

///\return The nodes and edges of the generated graph.

template<typename Graph>

PetStruct<Graph> addPetersen(Graph &G,int num = 5)

{

  PetStruct<Graph> n;

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

    n.outer.push_back(G.addNode());

    n.inner.push_back(G.addNode());

  }

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

   n.chords.push_back(G.addEdge(n.outer[i],n.inner[i]));

   n.outcir.push_back(G.addEdge(n.outer[i],n.outer[(i+1) % num]));

   n.incir.push_back(G.addEdge(n.inner[i],n.inner[(i+2) % num]));

  }

 return n;

}

/// \brief Adds to the graph the reverse pair of all edges.

///

/// Adds to the graph the reverse pair of all edges.

///

template<class Graph> void bidirGraph(Graph &G)

{

  typedef typename Graph::Edge Edge;

  typedef typename Graph::EdgeIt EdgeIt;

  std::vector<Edge> ee;

  for(EdgeIt e(G);e!=INVALID;++e) ee.push_back(e);

  for(typename std::vector<Edge>::iterator p=ee.begin();p!=ee.end();p++)

    G.addEdge(G.target(*p),G.source(*p));

}

/// \brief Checks the bidirectioned Petersen graph.

///

///  Checks the bidirectioned Petersen graph.

///

template<class Graph> void checkBidirPetersen(Graph &G, int num = 5)

{

  typedef typename Graph::Node Node;

  typedef typename Graph::EdgeIt EdgeIt;

  typedef typename Graph::NodeIt NodeIt;

  checkGraphNodeList(G, 2 * num);

  checkGraphEdgeList(G, 6 * num);

  for(NodeIt n(G);n!=INVALID;++n) {

    checkGraphInEdgeList(G, n, 3);

    checkGraphOutEdgeList(G, n, 3);

  }  

}

///Structure returned by \ref addUndirPetersen().

///Structure returned by \ref addUndirPetersen().

///

template<class Graph> struct UndirPetStruct

{

  ///Vector containing the outer nodes.

  std::vector<typename Graph::Node> outer;

  ///Vector containing the inner nodes.

  std::vector<typename Graph::Node> inner;

  ///Vector containing the edges of the inner circle.

  std::vector<typename Graph::UndirEdge> incir;

  ///Vector containing the edges of the outer circle.

  std::vector<typename Graph::UndirEdge> outcir;

  ///Vector containing the chord edges.

  std::vector<typename Graph::UndirEdge> chords;

};

///Adds a Petersen graph to the undirected \c G.

///Adds a Petersen graph to the undirected \c G.

///\return The nodes and edges of the generated graph.

template<typename Graph>

UndirPetStruct<Graph> addUndirPetersen(Graph &G,int num=5)

{

  UndirPetStruct<Graph> n;

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

    n.outer.push_back(G.addNode());

    n.inner.push_back(G.addNode());

  }

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

   n.chords.push_back(G.addEdge(n.outer[i],n.inner[i]));

   n.outcir.push_back(G.addEdge(n.outer[i],n.outer[(i+1)%5]));

   n.incir.push_back(G.addEdge(n.inner[i],n.inner[(i+2)%5]));

  }

 return n;

}

int _urandom_init() {

  int seed = time(0);

  srand(seed);

  return seed;

}

int urandom(int n) {

  static int seed = _urandom_init();

  ignore_unused_variable_warning(seed);

  return (int)(rand() / (1.0 + RAND_MAX) * n);

}

#endif