/*
 * Copyright (C) 1996-9 Brandon Long <blong@fiction.net>
 * Copyright (C) 1999-2001 Brendan Cully <brendan@kublai.com>
 * 
 *     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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 */ 

/* Mutt browser support routines */

#include <stdlib.h>
#include <ctype.h>

#include "mutt.h"
#include "imap_private.h"

/* -- forward declarations -- */
static int browse_add_list_result (IMAP_DATA* idata, const char* cmd,
  struct browser_state* state, short isparent);
static void imap_add_folder (char delim, char *folder, int noselect,
  int noinferiors, struct browser_state *state, short isparent);
static int compare_names(struct folder_file *a, struct folder_file *b);
static int browse_get_namespace (IMAP_DATA *idata, char *nsbuf, int nsblen, 
  IMAP_NAMESPACE_INFO *nsi, int nsilen, int *nns);
static int browse_verify_namespace (IMAP_DATA* idata,
  IMAP_NAMESPACE_INFO* nsi, int nns);

/* imap_browse: IMAP hook into the folder browser, fills out browser_state,
 *   given a current folder to browse */
int imap_browse (char* path, struct browser_state* state)
{
  IMAP_DATA* idata;
  char buf[LONG_STRING];
  char buf2[LONG_STRING];
  char nsbuf[LONG_STRING];
  char mbox[LONG_STRING];
  char list_cmd[5];
  IMAP_NAMESPACE_INFO nsi[16];
  int home_namespace = 0;
  int n;
  int i;
  int nsup;
  char ctmp;
  int nns;
  char *cur_folder;
  short showparents = 0;
  int noselect;
  int noinferiors;
  IMAP_MBOX mx;

  if (imap_parse_path (path, &mx))
  {
    mutt_error ("%s is an invalid IMAP path", path);
    return -1;
  }

  strfcpy (list_cmd, option (OPTIMAPLSUB) ? "LSUB" : "LIST", sizeof (list_cmd));

  if (!(idata = imap_conn_find (&(mx.account), 0)))
    goto fail;

  if (!mx.mbox)
  {
    home_namespace = 1;
    mbox[0] = '\0';		/* Do not replace "" with "INBOX" here */
    mx.mbox = safe_strdup(ImapHomeNamespace);
    nns = 0;
    if (mutt_bit_isset(idata->capabilities,NAMESPACE))
    {
      mutt_message _("Getting namespaces...");
      if (browse_get_namespace (idata, nsbuf, sizeof (nsbuf), 
			 nsi, sizeof (nsi),  &nns) != 0)
	goto fail;
      if (browse_verify_namespace (idata, nsi, nns) != 0)
	goto fail;
    }
  }

  mutt_message _("Getting folder list...");

  /* skip check for parents when at the root */
  if (mx.mbox && mx.mbox[0] != '\0')
  {
    imap_fix_path (idata, mx.mbox, mbox, sizeof (mbox));
    imap_munge_mbox_name (buf, sizeof (buf), mbox);
    imap_unquote_string(buf); /* As kludgy as it gets */
    mbox[sizeof (mbox) - 1] = '\0';
    strncpy (mbox, buf, sizeof (mbox) - 1);
    n = mutt_strlen (mbox);

    dprint (3, (debugfile, "imap_browse: mbox: %s\n", mbox));

    /* if our target exists and has inferiors, enter it if we
     * aren't already going to */
    if (mbox[n-1] != idata->delim)
    {
      snprintf (buf, sizeof (buf), "%s \"\" \"%s\"", list_cmd, mbox);
      imap_cmd_start (idata, buf);
      do 
      {
        if (imap_parse_list_response (idata, &cur_folder, &noselect,
            &noinferiors, &idata->delim) != 0)
	  goto fail;

        if (cur_folder)
        {
          imap_unmunge_mbox_name (cur_folder);

          if (!noinferiors && cur_folder[0] &&
            (n = strlen (mbox)) < LONG_STRING-1)
          {
            mbox[n++] = idata->delim;
            mbox[n] = '\0';
          }
        }
      }
      while (mutt_strncmp (idata->cmd.buf, idata->cmd.seq, SEQLEN));
    }

    /* if we're descending a folder, mark it as current in browser_state */
    if (mbox[n-1] == idata->delim)
    {
      /* don't show parents in the home namespace */
      if (!home_namespace)
	showparents = 1;
      imap_qualify_path (buf, sizeof (buf), &mx, mbox);
      state->folder = safe_strdup (buf);
      n--;
    }

    /* Find superiors to list
     * Note: UW-IMAP servers return folder + delimiter when asked to list
     *  folder + delimiter. Cyrus servers don't. So we ask for folder,
     *  and tack on delimiter ourselves.
     * Further note: UW-IMAP servers return nothing when asked for 
     *  NAMESPACES without delimiters at the end. Argh! */
    for (n--; n >= 0 && mbox[n] != idata->delim ; n--);
    if (n > 0)			/* "aaaa/bbbb/" -> "aaaa" */
    {
      /* forget the check, it is too delicate (see above). Have we ever
       * had the parent not exist? */
      ctmp = mbox[n];
      mbox[n] = '\0';

      if (showparents)
      {
	dprint (3, (debugfile, "imap_init_browse: adding parent %s\n", mbox));
	imap_add_folder (idata->delim, mbox, 1, 0, state, 1);
      }

      /* if our target isn't a folder, we are in our superior */
      if (!state->folder)
      {
        /* store folder with delimiter */
        mbox[n++] = ctmp;
        ctmp = mbox[n];
        mbox[n] = '\0';
        imap_qualify_path (buf, sizeof (buf), &mx, mbox);
        state->folder = safe_strdup (buf);
      }
      mbox[n] = ctmp;
    } 
    /* "/bbbb/" -> add  "/", "aaaa/" -> add "" */
    else
    {
      char relpath[2];
      /* folder may be "/" */
      snprintf (relpath, sizeof (relpath), "%c" , n < 0 ? '\0' : idata->delim);
      if (showparents)
        imap_add_folder (idata->delim, relpath, 1, 0, state, 1); 
      if (!state->folder)
      {
        imap_qualify_path (buf, sizeof (buf), &mx, relpath);
        state->folder = safe_strdup (buf);
      }
    }
  }

  /* no namespace, no folder: set folder to host only */
  if (!state->folder)
  {
    imap_qualify_path (buf, sizeof (buf), &mx, NULL);
    state->folder = safe_strdup (buf);
  }

  if (home_namespace && mbox[0] != '\0')
  {
    /* Listing the home namespace, so INBOX should be included. Home 
     * namespace is not "", so we have to list it explicitly. We ask the 
     * server to see if it has descendants. */
    dprint (3, (debugfile, "imap_browse: adding INBOX\n"));
    if (browse_add_list_result (idata, "LIST \"\" \"INBOX\"", state, 0))
      goto fail;
  }

  nsup = state->entrylen;

  dprint (3, (debugfile, "imap_browse: Quoting mailbox scan: %s -> ", mbox));
  snprintf (buf, sizeof (buf), "%s%%", mbox);
  imap_quote_string (buf2, sizeof (buf2), buf);
  dprint (3, (debugfile, "%s\n", buf2));
  snprintf (buf, sizeof (buf), "%s \"\" %s", list_cmd, buf2);
  if (browse_add_list_result (idata, buf, state, 0))
    goto fail;

  mutt_clear_error ();

  qsort(&(state->entry[nsup]),state->entrylen-nsup,sizeof(state->entry[0]),
	(int (*)(const void*,const void*)) compare_names);
  if (home_namespace)
  {				/* List additional namespaces */
    for (i = 0; i < nns; i++)
      if (nsi[i].listable && !nsi[i].home_namespace) {
	imap_add_folder(nsi[i].delim, nsi[i].prefix, nsi[i].noselect,
			nsi[i].noinferiors, state, 0);
	dprint (3, (debugfile, "imap_browse: adding namespace: %s\n",
		    nsi[i].prefix));
      }
  }

  FREE (&mx.mbox);
  return 0;

 fail:
  FREE (&mx.mbox);
  return -1;
}

/* imap_mailbox_create: Prompt for a new mailbox name, and try to create it */
int imap_mailbox_create (const char* folder)
{
  IMAP_DATA* idata;
  IMAP_MBOX mx;
  char buf[LONG_STRING];
  short n;

  if (imap_parse_path (folder, &mx) < 0)
  {
    dprint (1, (debugfile, "imap_mailbox_create: Bad starting path %s\n",
      folder));
    return -1;
  }

  if (!(idata = imap_conn_find (&mx.account, M_IMAP_CONN_NONEW)))
  {
    dprint (1, (debugfile, "imap_mailbox_create: Couldn't find open connection to %s", mx.account.host));
    goto fail;
  }
  
  strfcpy (buf, NONULL (mx.mbox), sizeof (buf));

  /* append a delimiter if necessary */
  n = mutt_strlen (buf);
  if (n && (n < sizeof (buf) - 1) && (buf[n-1] != idata->delim))
  {
    buf[n++] = idata->delim;
    buf[n] = '\0';
  }
  
  if (mutt_get_field (_("Create mailbox: "), buf, sizeof (buf), M_FILE) < 0)
    goto fail;

  if (!mutt_strlen (buf))
  {
    mutt_error (_("Mailbox must have a name."));
    mutt_sleep(1);
    goto fail;
  }
  
  if (imap_create_mailbox (idata, buf) < 0)
    goto fail;

  mutt_message _("Mailbox created.");
  mutt_sleep (0);

  FREE (&mx.mbox);
  return 0;

 fail:
  FREE (&mx.mbox);
  return -1;
}

static int browse_add_list_result (IMAP_DATA* idata, const char* cmd,
  struct browser_state* state, short isparent)
{
  char *name;
  int noselect;
  int noinferiors;
  IMAP_MBOX mx;

  if (imap_parse_path (state->folder, &mx))
  {
    dprint (2, (debugfile,
      "browse_add_list_result: current folder %s makes no sense\n", state->folder));
    return -1;
  }

  imap_cmd_start (idata, cmd);

  do 
  {
    if (imap_parse_list_response(idata, &name, &noselect, &noinferiors,
        &idata->delim) != 0)
    {
      FREE (&mx.mbox);
      return -1;
    }

    if (name)
    {
      /* Let a parent folder never be selectable for navigation */
      if (isparent)
        noselect = 1;
      /* prune current folder from output */
      if (isparent || mutt_strncmp (name, mx.mbox, strlen (name)))
        imap_add_folder (idata->delim, name, noselect, noinferiors, state,
          isparent);
    }
  }
  while ((mutt_strncmp (idata->cmd.buf, idata->cmd.seq, SEQLEN) != 0));

  FREE (&mx.mbox);
  return 0;
}

/* imap_add_folder: add a folder name to the browser list, formatting it as
 *   necessary. */
static void imap_add_folder (char delim, char *folder, int noselect,
  int noinferiors, struct browser_state *state, short isparent)
{
  char tmp[LONG_STRING];
  char relpath[LONG_STRING];
  IMAP_MBOX mx;

  if (imap_parse_path (state->folder, &mx))
    return;

  imap_unmunge_mbox_name (folder);

  if (state->entrylen + 1 == state->entrymax)
  {
    safe_realloc ((void **) &state->entry,
      sizeof (struct folder_file) * (state->entrymax += 256));
    memset (state->entry + state->entrylen, 0,
      (sizeof (struct folder_file) * (state->entrymax - state->entrylen)));
  }

  /* render superiors as unix-standard ".." */
  if (isparent)
    strfcpy (relpath, "../", sizeof (relpath));
  /* strip current folder from target, to render a relative path */
  else if (!mutt_strncmp (mx.mbox, folder, mutt_strlen (mx.mbox)))
    strfcpy (relpath, folder + mutt_strlen (mx.mbox), sizeof (relpath));
  else
    strfcpy (relpath, folder, sizeof (relpath));

  /* apply filemask filter. This should really be done at menu setup rather
   * than at scan, since it's so expensive to scan. But that's big changes
   * to browser.c */
  if (!((regexec (Mask.rx, relpath, 0, NULL, 0) == 0) ^ Mask.not))
  {
    FREE (&mx.mbox);
    return;
  }

  imap_qualify_path (tmp, sizeof (tmp), &mx, folder);
  (state->entry)[state->entrylen].name = safe_strdup (tmp);

  /* mark desc with delim in browser if it can have subfolders */
  if (!isparent && !noinferiors && strlen (relpath) < sizeof (relpath) - 1)
  {
    relpath[strlen (relpath) + 1] = '\0';
    relpath[strlen (relpath)] = delim;
  }
  
  (state->entry)[state->entrylen].desc = safe_strdup (relpath);

  (state->entry)[state->entrylen].imap = 1;
  /* delimiter at the root is useless. */
  if (folder[0] == '\0')
    delim = '\0';
  (state->entry)[state->entrylen].delim = delim;
  (state->entry)[state->entrylen].selectable = !noselect;
  (state->entry)[state->entrylen].inferiors = !noinferiors;
  (state->entrylen)++;

  FREE (&mx.mbox);
}

static int compare_names(struct folder_file *a, struct folder_file *b) 
{
  return mutt_strcmp(a->name, b->name);
}

static int browse_get_namespace (IMAP_DATA* idata, char* nsbuf, int nsblen,
  IMAP_NAMESPACE_INFO* nsi, int nsilen, int* nns)
{
  char *s;
  int n;
  char ns[LONG_STRING];
  char delim = '/';
  int type;
  int nsbused = 0;
  int rc;

  *nns = 0;
  nsbuf[nsblen-1] = '\0';

  imap_cmd_start (idata, "NAMESPACE");
  
  do 
  {
    if ((rc = imap_cmd_step (idata)) != IMAP_CMD_CONTINUE)
      break;

    s = imap_next_word (idata->cmd.buf);
    if (ascii_strncasecmp ("NAMESPACE", s, 9) == 0)
    {
      /* There are three sections to the response, User, Other, Shared,
       * and maybe more by extension */
      for (type = IMAP_NS_PERSONAL; *s; type++)
      {
	s = imap_next_word (s);
	if (*s && strncmp (s, "NIL", 3))
	{
	  s++;
	  while (*s && *s != ')')
	  {
	    s++; /* skip ( */
	    /* copy namespace */
	    n = 0;
	    delim = '\0';

	    if (*s == '\"')
	    {
	      s++;
	      while (*s && *s != '\"') 
	      {
		if (*s == '\\')
		  s++;
		ns[n++] = *s;
		s++;
	      }
	    }
	    else
	      while (*s && !ISSPACE (*s)) 
	      {
		ns[n++] = *s;
		s++;
	      }
	    ns[n] = '\0';
	    /* delim? */
	    s = imap_next_word (s);
	    /* delimiter is meaningless if namespace is "". Why does
	     * Cyrus provide one?! */
	    if (n && *s && *s == '\"')
	    {
	      if (s[1] && s[2] == '\"')
		delim = s[1];
	      else if (s[1] && s[1] == '\\' && s[2] && s[3] == '\"')
		delim = s[2];
	    }
	    /* skip "" namespaces, they are already listed at the root */
	    if ((ns[0] != '\0') && (nsbused < nsblen) && (*nns < nsilen))
	    {
	      dprint (3, (debugfile, "browse_get_namespace: adding %s\n", ns));
	      nsi->type = type;
	      /* Cyrus doesn't append the delimiter to the namespace,
	       * but UW-IMAP does. We'll strip it here and add it back
	       * as if it were a normal directory, from the browser */
	      if (n && (ns[n-1] == delim))
		ns[--n] = '\0';
	      strncpy (nsbuf+nsbused,ns,nsblen-nsbused-1);
	      nsi->prefix = nsbuf+nsbused;
	      nsbused += n+1;
	      nsi->delim = delim;
	      nsi++;
	      (*nns)++;
	    }
	    while (*s && *s != ')') s++;
	    s++;
	  }
	}
      }
    }
  }
  while (rc == IMAP_CMD_CONTINUE);

  if (rc != IMAP_CMD_OK)
    return -1;

  return 0;
}

/* Check which namespaces have contents */
static int browse_verify_namespace (IMAP_DATA* idata,
  IMAP_NAMESPACE_INFO *nsi, int nns)
{
  char buf[LONG_STRING];
  int i = 0;
  char *name;
  char delim;

  for (i = 0; i < nns; i++, nsi++)
  {
    /* Cyrus gives back nothing if the % isn't added. This may return lots
     * of data in some cases, I guess, but I currently feel that's better
     * than invisible namespaces */
    if (nsi->delim)
      snprintf (buf, sizeof (buf), "%s \"\" \"%s%c%%\"",
		option (OPTIMAPLSUB) ? "LSUB" : "LIST", nsi->prefix,
		nsi->delim);
    else
      snprintf (buf, sizeof (buf), "%s \"\" \"%s%%\"",
		option (OPTIMAPLSUB) ? "LSUB" : "LIST", nsi->prefix);

    imap_cmd_start (idata, buf);

    nsi->listable = 0;
    nsi->home_namespace = 0;
    do 
    {
      if (imap_parse_list_response(idata, &name, &nsi->noselect,
          &nsi->noinferiors, &delim) != 0)
	return -1;
      nsi->listable |= (name != NULL);
    }
    while ((mutt_strncmp (idata->cmd.buf, idata->cmd.seq, SEQLEN) != 0));
  }

  return 0;
}