/* $Id: rest_db.pc 3956 2010-01-05 20:56:56Z zacheiss $
 *
 * 	This program restores the Moira database from an mrbackup.
 *
 * Copyright (C) 1988-1998 by the Massachusetts Institute of Technology.
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <moira.h>
#include "dump_db.h"

#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

EXEC SQL INCLUDE sqlca;

RCSID("$HeadURL: svn+ssh://svn.mit.edu/moira/trunk/moira/backup/rest_db.pc $ $Id: rest_db.pc 3956 2010-01-05 20:56:56Z zacheiss $");

int yes_or_no(char *prompt);

int main(int argc, char **argv)
{
  char buf[BUFSIZ];
  char *prefix;
  EXEC SQL BEGIN DECLARE SECTION;
  char *db;
  EXEC SQL END DECLARE SECTION;

  if (argc != 2)
    {
      fprintf(stderr, "Usage: %s database\n", argv[0]);
      exit(1);
    }
  db = argv[1];

  if (!yes_or_no("Do you *REALLY* want to wipe the moira database?"))
    {
      printf("I didn't think so\n");
      exit(1);
    }
  sprintf(buf, "Have you initialized an empty database named %s?", db);
  if (!yes_or_no(buf))
    {
      printf("You should have\n");
      exit(1);
    }

  printf("Opening database: ");
  fflush(stdout);
  EXEC SQL CONNECT :db IDENTIFIED BY :db;
  if (sqlca.sqlcode != 0)
    {
      com_err(argv[0], 0, "Database open failed");
      exit(1);
    }
  printf(" done\n");

  printf("Prefix of backup to restore: ");
  fflush(stdout);
  if (!fgets(buf, sizeof(buf), stdin))
    return 1;
  
  prefix = strtrim(buf);

  if (!yes_or_no("Are you SURE?"))
    {
      printf("I didn't think so\n");
      exit(1);
    }
  do_restores(prefix);
  printf("Restore complete\n");
  EXEC SQL COMMIT;
  exit(0);
  /*NOTREACHED*/
}

int yes_or_no(char *prompt)
{
  char buf[BUFSIZ];
  int ret;

  int tt = open("/dev/tty", O_RDWR, 0);
  FILE *o, *i;

  char *cp;

  if (tt < 0)
    return 0;

  fflush(stdout);
  fflush(stderr);
  o = fdopen(dup(tt), "w");
  i = fdopen(dup(tt), "r");
  close(tt);

  for (;;)
    {
      fprintf(o, "%s (yes or no): ", prompt);
      fflush(o);
      if (!fgets(buf, BUFSIZ, i))
	goto err;
      for (cp = buf; *cp; cp++)
	{
	  if (isupper(*cp))
	    *cp = tolower(*cp);
	}
      if (!strcmp(buf, "yes\n"))
	{
	  ret = 1;
	  goto out;
	}
      if (!strcmp(buf, "no\n"))
	{
	  ret = 0;
	  goto out;
	}
    }

err:
  ret = 0;

out:
  fclose(o);
  fclose(i);
  return ret;
}

int parse_int(FILE *f)
{
  int c;
  int val = 0;
  int sign = 1;
  while ((c = getc(f)) != EOF && c != SEP_CHAR && c != '\n')
    {
      if (c == '-')
	sign = -1;
      else if (isdigit(c))
	{
	  val *= 10;
	  val += (c - '0');
	} else
	  fprintf(stderr, "non-digit in numeric field\n");
    }
  ungetc(c, f);
  return val * sign;
}

void parse_str(FILE *f, char *buf, int maxlen)
{
  int c, len = 0;

  while ((c = getc(f)) != EOF && c != SEP_CHAR && c != '\n' && len < maxlen)
    {
      if (c == '\\')
	{
	  c = getc(f);
	  if (isdigit(c))
	    {
	      /* Expect three-digit octal number.. */
	      int c1, c2;
	      c1 = getc(f);
	      c2 = getc(f);
	      if (!isdigit(c1) || !isdigit(c2))
		punt("Broken \\###");
	      /* Convert to ASCII code: */
	      *buf++ =  ((c - '0') << 6) + ((c1 - '0') << 3) + c2 - '0';
	      len++;
	    }
	  else if (c == '\\' || c == SEP_CHAR)
	    {
	      *buf++ = c;
	      len++;
	    }
	  else
	    punt ("Broken '\\'");
	}
      else
	{
	  *buf++ = c;
	  len++;
	}
    }
  *buf = '\0';
  if (c == EOF)
    return;

  if (c != EOF && c != SEP_CHAR && c != '\n')
    {
      fprintf(stderr, "Field too wide, truncated\n");
      while ((c = getc(f)) != EOF && c != SEP_CHAR && c != '\n')
	;
      ungetc(c, f);
    }
  else
    ungetc(c, f);
}

void parse_sep(FILE *f)
{
  if (getc(f) != SEP_CHAR)
    punt("Expected Separator");
}

void parse_nl(FILE *f)
{
  if (getc(f) != '\n')
    punt("Expected newline");
}

FILE *open_file(char *prefix, char *suffix)
{
  char name[BUFSIZ];
  int fd;
  FILE *f;

  EXEC SQL COMMIT WORK;

  strcpy(name, prefix);
  strcat(name, suffix);

  fd = open(name, O_RDONLY, 0);
  if (fd < 0)
    punt(name);
  f = fdopen(fd, "r");
  if (!f)
    {
      fprintf(stderr, "fdopen of ");
      punt(name);
    }
  fprintf(stderr, "Working on %s\n", name);
  return f;
}