/****************************************************************************
 * 
 *  MODULE:	r.terraflow
 *
 *  COPYRIGHT (C) 2007 Laura Toma
 *   
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *****************************************************************************/


#ifndef CCFOREST_H
#define CCFOREST_H

#include <assert.h>
#include <iostream>

#include <grass/iostream/ami.h>


#define DEBUG_CCFOREST if(0)

template<class T>
class keyvalue {
private:
  T key, value;
public:
  keyvalue() : key(-1), value(-1) {};
  keyvalue(T vk, T vv) : key(vk), value(vv) {};

  T getPriority() const { return key; };
  T getValue() const { return value; };
  T src() const { return key; };
  T dst() const { return value; };

  keyvalue operator =(const keyvalue &that) {
    key = that.key;
    value = that.value;
    return *this;
  };
  int operator != (const keyvalue &e2) const {
    return (key != e2.key) || (value != e2.value);
  }
  int operator == (const keyvalue &e2) const {
    return (value == e2.value) && (key == e2.key);
  }
  int operator > (const keyvalue &e2) const {
    return (key > e2.key) || (key == e2.key && value > e2.value);
  }
  int operator >= (const keyvalue &e2) const {
    return (key > e2.key) || (key == e2.key && value >= e2.value);
  }
  int operator < (const keyvalue &e2) const {
    return (key < e2.key) || (key == e2.key && value < e2.value);
  }
  int operator <= (const keyvalue &e2) const {
    return (key <= e2.key) || (key == e2.key && value <= e2.value);
  }

  friend ostream& operator<<(ostream& s, const keyvalue &p) {
    return s << "(" << p.key << "," << p.value << ")";
  }

  static int qscompare(const void *a, const void *b) {
	keyvalue<T> *x = (keyvalue<T>*)a;
	keyvalue<T> *y = (keyvalue<T>*)b;
	return compare(*x, *y);
  }

  static int compare(const keyvalue<T> &x, const keyvalue<T> &y) {
	return  (x < y ? -1 : (x > y ? 1 : 0));
  }

};


/* laura: used in sort (instead of <); checkit  */
template<class T>
class keyCmpKeyvalueType {
public:
  static int compare(const keyvalue<T>  &a, const keyvalue<T>  &b) {
	if (a.getPriority() < b.getPriority()) return -1;
	if (a.getPriority() > b.getPriority()) return 1;
	return 0;
  }
};



/* ---------------------------------------------------------------------- */
/* laura: used in sort instead of valueCmp; checkit */
template<class T>
class dstCmpKeyvalueType {
public: 
  static int compare (const keyvalue<T> &a, const keyvalue<T> &b) {
    if(a.dst() < b.dst()) return -1;
    if(a.dst() > b.dst()) return 1;
    
    if(a.src() < b.src()) return -1;
    if(a.src() > b.src()) return 1;
    
    return 0;
  }
};



template<class T> class ccforest;

template<class T> 
class ccforest {
  /* class cckeyvalue : public keyvalue<T> {}; */
  typedef keyvalue<T> ccedge;
  typedef keyvalue<T> cckeyvalue;
private:  
  AMI_STREAM<ccedge> *edgeStream;
  AMI_STREAM<cckeyvalue> *rootStream;
 
  void findAllRoots(int depth=0);
  int rootCycles;
  ccforest<T> *superTree;
  void removeDuplicates(T src, T parent,
			EMPQueueAdaptive<cckeyvalue,T> &pq);
  int foundAllRoots;
  cckeyvalue savedRoot;
  int savedRootValid;
public:
  ccforest();
  ~ccforest();
  void insert(const T& i, const T& j); /* insert edge (i,j) */
  T findNextRoot(const T& i);	/* find root where i >= prev i */
  void printRootStream();
  void printEdgeStream();
  off_t size();
};


#endif /* CCFOREST_H */

