/*
 * jabberwocky - a password suggester
 */
#include <u.h>
#include <libc.h>

static char *sets[] = {
	['C'] "BCDFGHJKLMNPQRSTVWXYZ",
	['V'] "AEIOU",
	['c'] "bcdfghjklmnpqrstvwxyz",
	['v'] "aeiou",
	['n'] "0123456789",
	['%'] "!@#$%^&*()-+_~|{}[]/<>:;'\"\\=",
};

char *
genpat(void)
{
	int i, len;
	char *pat, *p;

	len = rand()%12;
	len = (len < 8) ? 8 : len;
	pat = malloc(len+1);
	if (! pat) return nil;

	for (i = 0, p = pat; i < len; i++, p++)
		*p = "CVcvn%"[(rand()%6)];

	*p = 0;
	return pat;
}

char *
jabberwocky(char *pat)
{
	char *p;
	char *w, *jab;

	jab = malloc(strlen(pat)+1);

	for (p = pat, w = jab; p && *p && w; p++) {
		if (strchr("CVcnv%", *p))
			*w++ = sets[*p][rand()%strlen(sets[*p])];
	}
	*w = 0;
	return jab;
}

void
usage(void)
{
	print("%s [pattern]\npattern ::= {'C' | 'V' | 'c' | 'v' | 'n' | '%%' } | pattern\n", argv0);
}

main(int argc, char **argv)
{
	char *jab;

	srand(time(0)+getpid());

	argv0 = argv[0];
	ARGBEGIN{
	case 'h':
		usage(); 
		exits("");
	default:
		break;
	}ARGEND;

	if (argc == 0)
		print("%s\n", jabberwocky(genpat()));
	else
		do {
			jab = jabberwocky(*argv);
			print("%s\n", jab);
			free(jab);
			argc--;
			argv++;
		} while (argc);

	exits(nil);
}