#include <ctype.h>

#include <sys/wait.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "../histedit.h"

static int continuation;
volatile sig_atomic_t gotsig;
static const char hfile[] = ".whistory";

static wchar_t *
prompt(EditLine *el)
{
static wchar_t a[] = L"\1\033[7m\1Edit$\1\033[0m\1 ";
static wchar_t b[] = L"Edit> ";

return continuation ? b : a;
}

static void
sig(int i)
{
gotsig = i;
}

const char *
my_wcstombs(const wchar_t *wstr)
{
static struct {
char *str;
int len;
} buf;

int needed = wcstombs(0, wstr, 0) + 1;
if (needed > buf.len) {
buf.str = malloc(needed);
buf.len = needed;
}
wcstombs(buf.str, wstr, needed);
buf.str[needed - 1] = 0;

return buf.str;
}

static unsigned char
complete(EditLine *el, int ch)
{
DIR *dd = opendir(".");
struct dirent *dp;
const wchar_t *ptr;
char *buf, *bptr;
const LineInfoW *lf = el_wline(el);
int len, mblen, i;
unsigned char res = 0;
wchar_t dir[1024];

/* Find the last word */
for (ptr = lf->cursor -1; !iswspace(*ptr) && ptr > lf->buffer; --ptr)
continue;
len = lf->cursor - ++ptr;

/* Convert last word to multibyte encoding, so we can compare to it */
wctomb(NULL, 0); /* Reset shift state */
mblen = MB_LEN_MAX * len + 1;
buf = bptr = malloc(mblen);
if (buf == NULL)
err(1, "malloc");
for (i = 0; i < len; ++i) {
/* Note: really should test for -1 return from wctomb */
bptr += wctomb(bptr, ptr[i]);
}
*bptr = 0; /* Terminate multibyte string */
mblen = bptr - buf;

/* Scan directory for matching name */
for (dp = readdir(dd); dp != NULL; dp = readdir(dd)) {
if (mblen > strlen(dp->d_name))
continue;
if (strncmp(dp->d_name, buf, mblen) == 0) {
mbstowcs(dir, &dp->d_name[mblen],
sizeof(dir) / sizeof(*dir));
if (el_winsertstr(el, dir) == -1)
res = CC_ERROR;
else
res = CC_REFRESH;
break;
}
}

closedir(dd);
free(buf);
return res;
}

int
main(int argc, char *argv[])
{
EditLine *el = NULL;
int numc, ncontinuation;
const wchar_t *line;
TokenizerW *tok;
HistoryW *hist;
HistEventW ev;
#ifdef DEBUG
int i;
#endif

setlocale(LC_ALL, "");

(void)signal(SIGINT, sig);
(void)signal(SIGQUIT, sig);
(void)signal(SIGHUP, sig);
(void)signal(SIGTERM, sig);

hist = history_winit(); /* Init built-in history */
history_w(hist, &ev, H_SETSIZE, 100); /* Remember 100 events */
history_w(hist, &ev, H_LOAD, hfile);

tok = tok_winit(NULL); /* Init the tokenizer */

el = el_init(argv[0], stdin, stdout, stderr);

el_wset(el, EL_EDITOR, L"vi"); /* Default editor is vi */
el_wset(el, EL_SIGNAL, 1); /* Handle signals gracefully */
el_wset(el, EL_PROMPT_ESC, prompt, '\1'); /* Set the prompt function */

el_wset(el, EL_HIST, history_w, hist); /* FIXME - history_w? */

/* Add a user-defined function */
el_wset(el, EL_ADDFN, L"ed-complete", L"Complete argument", complete);

/* Bind <tab> to it */
el_wset(el, EL_BIND, L"^I", L"ed-complete", NULL);

/*
* Bind j, k in vi command mode to previous and next line, instead
* of previous and next history.
*/
el_wset(el, EL_BIND, L"-a", L"k", L"ed-prev-line", NULL);
el_wset(el, EL_BIND, L"-a", L"j", L"ed-next-line", NULL);

/* Source the user's defaults file. */
el_source(el, NULL);

while((line = el_wgets(el, &numc)) != NULL && numc != 0) {
int ac, cc, co, rc;
const wchar_t **av;

const LineInfoW *li;
li = el_wline(el);

#ifdef DEBUG
(void)fwprintf(stderr, L"==> got %d %ls", numc, line);
(void)fwprintf(stderr, L" > li `%.*ls_%.*ls'\n",
(li->cursor - li->buffer), li->buffer,
(li->lastchar - 1 - li->cursor),
(li->cursor >= li->lastchar) ? L"" : li->cursor);
#endif

if (gotsig) {
(void)fprintf(stderr, "Got signal %d.\n", (int)gotsig);
gotsig = 0;
el_reset(el);
}

if(!continuation && numc == 1)
continue; /* Only got a linefeed */

ac = cc = co = 0;
ncontinuation = tok_wline(tok, li, &ac, &av, &cc, &co);
if (ncontinuation < 0) {
(void) fprintf(stderr, "Internal error\n");
continuation = 0;
continue;
}

#ifdef DEBUG
(void)fprintf(stderr, " > nc %d ac %d cc %d co %d\n",
ncontinuation, ac, cc, co);
#endif
history_w(hist, &ev, continuation ? H_APPEND : H_ENTER, line);

continuation = ncontinuation;
ncontinuation = 0;
if(continuation)
continue;

#ifdef DEBUG
for (i = 0; i < ac; ++i) {
(void)fwprintf(stderr, L" > arg# %2d ", i);
if (i != cc)
(void)fwprintf(stderr, L"`%ls'\n", av[i]);
else
(void)fwprintf(stderr, L"`%.*ls_%ls'\n",
co, av[i], av[i] + co);
}
#endif

if (wcscmp (av[0], L"history") == 0) {
switch(ac) {
case 1:
for(rc = history_w(hist, &ev, H_LAST);
rc != -1;
rc = history_w(hist, &ev, H_PREV))
(void)fwprintf(stdout, L"%4d %ls",
ev.num, ev.str);
break;
case 2:
if (wcscmp(av[1], L"clear") == 0)
history_w(hist, &ev, H_CLEAR);
else
goto badhist;
break;
case 3:
if (wcscmp(av[1], L"load") == 0)
history_w(hist, &ev, H_LOAD,
my_wcstombs(av[2]));
else if (wcscmp(av[1], L"save") == 0)
history_w(hist, &ev, H_SAVE,
my_wcstombs(av[2]));
else
goto badhist;
break;
badhist:
default:
(void)fprintf(stderr,
"Bad history arguments\n");
break;
}
} else if (el_wparse(el, ac, av) == -1) {
switch (fork()) {
case 0: {
Tokenizer *ntok = tok_init(NULL);
int nargc;
const char **nav;
tok_str(ntok, my_wcstombs(line), &nargc, &nav);
execvp(nav[0],(char **)nav);
perror(nav[0]);
_exit(1);
/* NOTREACHED */
break;
}
case -1:
perror("fork");
break;
default:
if (wait(&rc) == -1)
perror("wait");
(void)fprintf(stderr, "Exit %x\n", rc);
break;
}
}

tok_wreset(tok);
}

el_end(el);
tok_wend(tok);
history_w(hist, &ev, H_SAVE, hfile);
history_wend(hist);

fprintf(stdout, "\n");
return 0;
}