/* fsaexists.c 4/11/94.
 * Calculates finite state automaton that accepts w_1 if and only if
 * input automaton accepts (w_1,w_2) for some w_2.
 *
 * SYNOPSIS:  fsaexists [-ip d/s[dr]] [-op d/s] [-silent] [-v] [-l/-h]
 *              filename
 *
 * Input is from filename, which should contain a fsa.
 * Output is to filename.exists
 *
 * OPTIONS:
 * -ip d/s[dr]  input in dense or sparse format - dense is default
 * -op d/s      output in dense or sparse format - default is as in current
 *               value of table->printing_format, in the fsa.
 * -v           verbose
 * -silent      no diagnostics
 * -l/-h        large/huge hash-tables (for big examples)
 */

#include <stdio.h>
#include "defs.h"
#include "fsa.h"
#include "definitions.h"

static FILE *rfile, *wfile;

static void badusage(void);

int main(int argc, char *argv[])
{
  int arg;
  fsa fsain, *fsaexists;
  char inf[100], outf[100], fsaname[100], tempfilename[100];
  storage_type ip_store = DENSE;
  int dr = 0;
  storage_type op_store = DENSE;

  setbuf(stdout, (char *)0);
  setbuf(stderr, (char *)0);

  inf[0] = '\0';
  arg = 1;
  while (argc > arg) {
    if (strcmp(argv[arg], "-ip") == 0) {
      arg++;
      if (arg >= argc)
        badusage();
      if (strcmp(argv[arg], "d") == 0)
        ip_store = DENSE;
      else if (argv[arg][0] == 's') {
        ip_store = SPARSE;
        if (stringlen(argv[arg]) > 1)
          dr = atoi(argv[arg] + 1);
      }
      else
        badusage();
    }
    else if (strcmp(argv[arg], "-op") == 0) {
      arg++;
      if (arg >= argc)
        badusage();
      if (strcmp(argv[arg], "d") == 0)
        op_store = DENSE;
      else if (strcmp(argv[arg], "s") == 0)
        op_store = SPARSE;
      else
        badusage();
    }
    else if (strcmp(argv[arg], "-silent") == 0)
      kbm_print_level = 0;
    else if (strcmp(argv[arg], "-v") == 0)
      kbm_print_level = 2;
    else if (strcmp(argv[arg], "-vv") == 0)
      kbm_print_level = 3;
    else if (strcmp(argv[arg], "-l") == 0)
      kbm_large = TRUE;
    else if (strcmp(argv[arg], "-h") == 0)
      kbm_huge = TRUE;
    else {
      if (argv[arg][0] == '-')
        badusage();
      if (strcmp(inf, ""))
        badusage();
      make_filename(inf, sizeof(inf), "%s", argv[arg]);
    }
    arg++;
  }
  if (stringlen(inf) == 0)
    badusage();

  make_filename(outf, sizeof(outf), "%s.exists", inf);

  if ((rfile = fopen(inf, "r")) == 0) {
    fprintf(stderr, "Cannot open file %s.\n", inf);
    exit(1);
  }
  fsa_read(rfile, &fsain, ip_store, dr, 0, TRUE, fsaname);

  if (fsain.alphabet->type != PRODUCT || fsain.alphabet->arity != 2) {
    fprintf(stderr, "Error: fsa must be 2-variable.\n");
    exit(1);
  }

  make_filename(tempfilename, sizeof(tempfilename), "%stemp_exists_XXX", inf);
  fsaexists = fsa_exists(&fsain, op_store, TRUE, tempfilename);
  if (fsaexists == 0)
    exit(1);

  if (kbm_print_level > 1)
    printf("  Number of states of fsaexists before minimisation = %d.\n",
           fsaexists->states->size);
  if (fsa_minimize(fsaexists) == -1)
    exit(1);
  if (kbm_print_level > 1)
    printf("  Number of states of fsaexists after minimisation = %d.\n",
           fsaexists->states->size);

  append_filename(fsaname, sizeof(fsaname), "_exists");
  wfile = fopen(outf, "w");
  fsa_print(wfile, fsaexists, fsaname);
  fclose(wfile);

  if (kbm_print_level > 0)
    printf("#\"Exists\" fsa with %d states computed.\n",
           fsaexists->states->size);

  fsa_clear(fsaexists);
  tfree(fsaexists);
  exit(0);
}
void badusage(void)
{
  fprintf(stderr, "Usage: fsaexists [-ip d/s[dr]] [-op d/s] [-silent] [-v] "
                  "[-l/-h] filename\n");
  exit(1);
}
