/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2006-2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard st, Cambridge MA, 02139 USA
   
   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.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA 
   02110-1301 USA

*/

#include <igraph.h>

void print_matrix(igraph_spmatrix_t *m, FILE *f) {
  long int i, j;
  for (i=0; i<igraph_spmatrix_nrow(m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(m); j++) {
      fprintf(f, " %li", (long int)igraph_spmatrix_e(m, i, j));
    }
    fprintf(f, "\n");
  }  
  fprintf(f, "=========================\n");
}

void print_vector(igraph_vector_t *v, FILE *f) {
  long int i;
  for (i=0; i<igraph_vector_size(v); i++) {
    fprintf(f, " %li", (long int)VECTOR(*v)[i]);
  }
  fprintf(f, "\n=========================\n");
}

int main() {
  igraph_spmatrix_t m, m1;
  igraph_spmatrix_iter_t mit;
  igraph_real_t arr[12];
  igraph_vector_t v;
  long int i, j;
  int order[] = { 1, 5, 8, 4, 0, 9, 6, 10, 11, 2, 3, 7 };

  /* igraph_spmatrix_init, igraph_spmatrix_destroy */
  igraph_spmatrix_init(&m, 10, 10);
  igraph_spmatrix_destroy(&m);
  
  igraph_spmatrix_init(&m, 0, 0);
  igraph_spmatrix_destroy(&m);
  
  /* igraph_spmatrix_ncol, igraph_spmatrix_nrow */
  igraph_spmatrix_init(&m, 10, 5);
  if (igraph_spmatrix_nrow(&m) != 10) {
    return 1;
  }
  if (igraph_spmatrix_ncol(&m) != 5) {
    return 2;
  }

  /* igraph_spmatrix_size, igraph_spmatrix_resize */
  igraph_spmatrix_resize(&m, 6, 5);
  if (igraph_spmatrix_size(&m) != 30) {
    return 3;
  }
  if (igraph_spmatrix_nrow(&m) != 6) {
    return 4;
  }
  if (igraph_spmatrix_ncol(&m) != 5) {
    return 5;
  }
  igraph_spmatrix_resize(&m, 2, 4);
  if (igraph_spmatrix_nrow(&m) != 2) {
    return 6;
  }
  if (igraph_spmatrix_ncol(&m) != 4) {
    return 7;
  }
  igraph_spmatrix_destroy(&m);
  
  /* igraph_spmatrix_get, igraph_spmatrix_set, igraph_spmatrix_null */
  igraph_spmatrix_init(&m, 3, 4);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, (i+j) % 3);
    }
  }
  print_matrix(&m, stdout);
  igraph_spmatrix_null(&m);
  print_matrix(&m, stdout);
  /* now fill it in shuffled order */
  for (i=0; i<12; i++) {
    igraph_spmatrix_set(&m, order[i]/4, order[i]%4, (order[i]/4+order[i]%4) % 3);
  }
  print_matrix(&m, stdout);
  /* now decrease all elements by two in shuffled order */
  for (i=0; i<12; i++) {
    igraph_spmatrix_add_e(&m, order[i]/4, order[i]%4, -2);
  }
  print_matrix(&m, stdout);
  /* now increase all elements by one in shuffled order */
  for (i=0; i<12; i++) {
    igraph_spmatrix_add_e(&m, order[i]/4, order[i]%4, 1);
  }
  print_matrix(&m, stdout);

  igraph_spmatrix_destroy(&m);
  
  /* igraph_matrix_add_cols, igraph_matrix_add_rows */
  igraph_spmatrix_init(&m, 4, 3);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, (i+1)*(j+1));
    }
  }
  igraph_spmatrix_add_cols(&m, 2);
  igraph_spmatrix_add_rows(&m, 2);
  if (igraph_spmatrix_ncol(&m) != 5) {
    return 8;
  }
  if (igraph_spmatrix_nrow(&m) != 6) {
    return 9;
  }
  print_matrix(&m, stdout);
  igraph_spmatrix_destroy(&m);

  /* igraph_spmatrix_count_nonzero */
  igraph_spmatrix_init(&m, 5, 3);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, i*j);
    }
  }
  print_matrix(&m, stdout);
  if (igraph_spmatrix_count_nonzero(&m) != 8) {
    return 10;
  }
  igraph_spmatrix_destroy(&m);

  /* igraph_spmatrix_copy */
  igraph_spmatrix_init(&m, 3, 4);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, i*j);
    }
  }
  igraph_spmatrix_copy(&m1, &m);
  print_matrix(&m1, stdout);
  igraph_spmatrix_destroy(&m);
  igraph_spmatrix_destroy(&m1);

  /* igraph_spmatrix_copy_to */
  igraph_spmatrix_init(&m, 3, 4);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, i*j);
    }
  }
  igraph_spmatrix_copy_to(&m, arr);
  for (i=0; i<12; i++) { printf(" %ld", (long)arr[i]); }
  printf("\n=========================\n");
  
  /* igraph_spmatrix_max */
  arr[0] = igraph_spmatrix_max(&m, arr+1, arr+2);
  for (i=0; i<3; i++) { printf(" %ld", (long)arr[i]); }
  printf("\n=========================\n");
 
  igraph_spmatrix_destroy(&m);

  /* igraph_spmatrix_colsums */
  igraph_spmatrix_init(&m, 3, 5);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      igraph_spmatrix_set(&m, i, j, i+j-4);
    }
  }
  igraph_vector_init(&v, 0);
  igraph_spmatrix_colsums(&m, &v);
  print_vector(&v, stdout);
  igraph_vector_destroy(&v);
  igraph_spmatrix_destroy(&m);

  /* igraph_spmatrix_iter_t */
  igraph_spmatrix_init(&m, 5, 5);
  for (i=0; i<igraph_spmatrix_nrow(&m); i++) {
    for (j=0; j<igraph_spmatrix_ncol(&m); j++) {
      if (abs(i-j) == 1)
        igraph_spmatrix_set(&m, i, j, (i+1)*(j+1));
    }
  }
  igraph_spmatrix_iter_create(&mit, &m);
  while (!igraph_spmatrix_iter_end(&mit)) {
    printf("%ld %ld %ld\n", mit.ri, mit.ci, (long int)mit.value);
    igraph_spmatrix_iter_next(&mit);
  }
  igraph_spmatrix_iter_destroy(&mit);
  igraph_spmatrix_destroy(&m);
  printf("=========================\n");

  /* TODO: igraph_spmatrix_add_col_values */

  return 0;
}