#ifndef TGBGAUSS_HEADER
#define TGBGAUSS_HEADER
/****************************************
*  Computer Algebra System SINGULAR     *
****************************************/
/* $Id$ */
/*
* ABSTRACT: gauss implementation for F4 header
*/
#include <kernel/mod2.h>
#include <coeffs/numbers.h>
//#include "tgb_internal.h"

struct slimgb_alg;

class tgb_matrix{
 private:
  number** n;
  int columns;
  int rows;
  BOOLEAN free_numbers;
 public:
  tgb_matrix(int i, int j);
  ~tgb_matrix();
  int get_rows();
  int get_columns();
  void print();
  void perm_rows(int i, int j);
  void set(int i, int j, number n);
  number get(int i, int j);
  BOOLEAN is_zero_entry(int i, int j);
  void free_row(int row, BOOLEAN free_non_zeros=TRUE);
  int min_col_not_zero_in_row(int row);
  int next_col_not_zero(int row,int pre);
  BOOLEAN zero_row(int row);
  void mult_row(int row,number factor);
  void add_lambda_times_row(int add_to,int summand,number factor);
  int non_zero_entries(int row);
};

class mac_poly_r{
public:
  number coef;
  mac_poly_r* next;
  int exp;
  mac_poly_r():next(NULL){}
};
//mac_polys exp are smaller iff they are greater by monomial ordering
//corresponding to solving linear equations notation

typedef mac_poly_r* mac_poly;

class tgb_sparse_matrix{
 private:
  ring r;
  mac_poly* mp;
  int columns;
  int rows;
  BOOLEAN free_numbers;
 public:
  void sort_rows();
  friend poly free_row_to_poly(tgb_sparse_matrix* mat, int row, poly* monoms, int monom_index);
  friend void init_with_mac_poly(tgb_sparse_matrix* mat, int row, mac_poly m);
  tgb_sparse_matrix(int i, int j, ring rarg);
  ~tgb_sparse_matrix();
  int get_rows();
  int get_columns();
  void print();
  void row_normalize(int row);
  void row_content(int row);
  //  void perm_rows(int i, int j);
  void perm_rows(int i, int j){
  mac_poly h;
  h=mp[i];
  mp[i]=mp[j];
  mp[j]=h;
  }
  void set(int i, int j, number n);
  number get(int i, int j);
  BOOLEAN is_zero_entry(int i, int j);
  void free_row(int row, BOOLEAN free_non_zeros=TRUE);
  int min_col_not_zero_in_row(int row);
  int next_col_not_zero(int row,int pre);
  BOOLEAN zero_row(int row);
  void mult_row(int row,number factor);
  void add_lambda_times_row(int add_to,int summand,number factor);
  int non_zero_entries(int row);
};
void simple_gauss(tgb_sparse_matrix* mat, slimgb_alg* c);
void simple_gauss2(tgb_matrix* mat);



mac_poly mac_p_add_ff_qq(mac_poly a, number f,mac_poly b);

void mac_mult_cons(mac_poly p,number c);
int mac_length(mac_poly p);

//contrary to delete on the mac_poly_r, the coefficients are also destroyed here
void mac_destroy(mac_poly p);

#endif