/*
 * 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.
 */ 

/* message parsing/updating functions */

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

#include "mutt.h"
#include "imap_private.h"
#include "message.h"
#include "mx.h"

#ifdef HAVE_PGP
#include "pgp.h"
#endif

static void flush_buffer(char* buf, size_t* len, CONNECTION* conn);
static int msg_fetch_header (CONTEXT* ctx, IMAP_HEADER* h, char* buf,
  FILE* fp);
static int msg_has_flag (LIST* flag_list, const char* flag);
static int msg_parse_fetch (IMAP_HEADER* h, char* s);
static char* msg_parse_flags (IMAP_HEADER* h, char* s);

/* imap_read_headers:
 * Changed to read many headers instead of just one. It will return the
 * msgno of the last message read. It will return a value other than
 * msgend if mail comes in while downloading headers (in theory).
 */
int imap_read_headers (IMAP_DATA* idata, int msgbegin, int msgend)
{
  CONTEXT* ctx;
  char buf[LONG_STRING];
  char hdrreq[STRING];
  FILE *fp;
  char tempfile[_POSIX_PATH_MAX];
  int msgno;
  IMAP_HEADER h;
  int rc, mfhrc;
  int fetchlast = 0;
  const char *want_headers = "DATE FROM SUBJECT TO CC MESSAGE-ID REFERENCES CONTENT-TYPE IN-REPLY-TO REPLY-TO LINES X-LABEL";

  ctx = idata->ctx;

  /* define search string */
  if (mutt_bit_isset (idata->capabilities,IMAP4REV1))
  {
    snprintf (hdrreq, sizeof (hdrreq), "BODY.PEEK[HEADER.FIELDS (%s)]", 
      want_headers); 
  } 
  else if (mutt_bit_isset (idata->capabilities,IMAP4))
  {
    snprintf (hdrreq, sizeof (hdrreq), "RFC822.HEADER.LINES (%s)", 
      want_headers);
  }
  else
  {	/* Unable to fetch headers for lower versions */
    mutt_error _("Unable to fetch headers from this IMAP server version.");
    sleep (2);	/* pause a moment to let the user see the error */
    return -1;
  }

  /* instead of downloading all headers and then parsing them, we parse them
   * as they come in. */
  mutt_mktemp (tempfile);
  if (!(fp = safe_fopen (tempfile, "w+")))
    return -1;
  unlink (tempfile);

  /* make sure context has room to hold the mailbox */
  while ((msgend) >= idata->ctx->hdrmax)
    mx_alloc_memory (idata->ctx);

  for (msgno = msgbegin; msgno <= msgend ; msgno++)
  {
    if (ReadInc && (!msgno || ((msgno+1) % ReadInc == 0)))
      mutt_message (_("Fetching message headers... [%d/%d]"), msgno + 1,
        msgend + 1);

    if (msgno + 1 > fetchlast)
    {
      /*
       * Make one request for everything. This makes fetching headers an
       * order of magnitude faster if you have a large mailbox.
       *
       * If we get more messages while doing this, we make another
       * request for all the new messages.
       */
      snprintf (buf, sizeof (buf),
        "FETCH %d:%d (UID FLAGS INTERNALDATE RFC822.SIZE %s)", msgno + 1,
        msgend + 1, hdrreq);

      imap_cmd_start (idata, buf);

      fetchlast = msgend + 1;
    }

    /* freshen fp, h */
    rewind (fp);
    memset (&h, 0, sizeof (h));
    h.data = safe_calloc (1, sizeof (IMAP_HEADER_DATA));

    /* this DO loop does two things:
     * 1. handles untagged messages, so we can try again on the same msg
     * 2. fetches the tagged response at the end of the last message.
     */
    do
    {
      mfhrc = 0;

      rc = imap_cmd_step (idata);
      if (rc != IMAP_CMD_CONTINUE)
	break;

      if ((mfhrc = msg_fetch_header (idata->ctx, &h, idata->cmd.buf, fp)) == -1)
	continue;
      else if (mfhrc < 0)
	break;

      /* make sure we don't get remnants from older larger message headers */
      fputs ("\n\n", fp);

      /* update context with message header */
      ctx->hdrs[msgno] = mutt_new_header ();

      ctx->hdrs[msgno]->index = ctx->msgcount;
      ctx->hdrs[msgno]->index = h.sid - 1;
      if (h.sid != ctx->msgcount + 1)
	dprint (1, (debugfile, "imap_read_headers: msgcount and sequence ID are inconsistent!"));
      /* messages which have not been expunged are ACTIVE (borrowed from mh 
       * folders) */
      ctx->hdrs[msgno]->active = 1;
      ctx->hdrs[msgno]->read = h.read;
      ctx->hdrs[msgno]->old = h.old;
      ctx->hdrs[msgno]->deleted = h.deleted;
      ctx->hdrs[msgno]->flagged = h.flagged;
      ctx->hdrs[msgno]->replied = h.replied;
      ctx->hdrs[msgno]->changed = h.changed;
      ctx->hdrs[msgno]->received = h.received;
      ctx->hdrs[msgno]->data = (void *) (h.data);

      rewind (fp);
      /* NOTE: if Date: header is missing, mutt_read_rfc822_header depends
       *   on h.received being set */
      ctx->hdrs[msgno]->env = mutt_read_rfc822_header (fp, ctx->hdrs[msgno],
        0, 0);
      /* content built as a side-effect of mutt_read_rfc822_header */
      ctx->hdrs[msgno]->content->length = h.content_length;

      mx_update_context (ctx); /* increments ->msgcount */
    }
    while ((rc != IMAP_CMD_OK) && ((mfhrc == -1) ||
      ((msgno + 1) >= fetchlast)));

    if ((mfhrc < -1) || ((rc != IMAP_CMD_CONTINUE) && (rc != IMAP_CMD_OK)))
    {
      imap_free_header_data ((void**) &h.data);
      fclose (fp);

      return -1;
    }
	
    /* h.data shouldn't be freed here, it is kept in ctx->headers */

    /* in case we get new mail while fetching the headers */
    if (idata->reopen & IMAP_NEWMAIL_PENDING)
    {
      msgend = idata->newMailCount - 1;
      while ((msgend) >= ctx->hdrmax)
	mx_alloc_memory (ctx);
      idata->status &= ~IMAP_NEWMAIL_PENDING;
    }
  }

  fclose(fp);

  return msgend;
}

int imap_fetch_message (MESSAGE *msg, CONTEXT *ctx, int msgno)
{
  IMAP_DATA* idata;
  HEADER* h;
  char buf[LONG_STRING];
  char path[_POSIX_PATH_MAX];
  char *pc;
  long bytes;
  int uid;
  int cacheno;
  IMAP_CACHE *cache;
  int read;
  int rc;
  /* Sam's weird courier server returns an OK response even when FETCH
   * fails. Thanks Sam. */
  short fetched = 0;

  idata = (IMAP_DATA*) ctx->data;

  /* see if we already have the message in our cache */
  cacheno = HEADER_DATA(ctx->hdrs[msgno])->uid % IMAP_CACHE_LEN;
  cache = &idata->cache[cacheno];

  if (cache->path)
  {
    if (cache->uid == HEADER_DATA(ctx->hdrs[msgno])->uid)
    {
      /* yes, so just return a pointer to the message */
      if (!(msg->fp = fopen (cache->path, "r")))
      {
	mutt_perror (cache->path);
	return (-1);
      }
      return 0;
    }
    else
    {
      /* clear the previous entry */
      unlink (cache->path);
      FREE (&cache->path);
    }
  }

  mutt_message _("Fetching message...");

  cache->uid = HEADER_DATA(ctx->hdrs[msgno])->uid;
  mutt_mktemp (path);
  cache->path = safe_strdup (path);
  if (!(msg->fp = safe_fopen (path, "w+")))
  {
    safe_free ((void**) &cache->path);
    return -1;
  }

  snprintf (buf, sizeof (buf), "UID FETCH %d %s",
	    HEADER_DATA(ctx->hdrs[msgno])->uid,
	    (mutt_bit_isset (idata->capabilities, IMAP4REV1) ?
	     (option (OPTIMAPPEEK) ? "BODY.PEEK[]" : "BODY[]") :
	     "RFC822"));

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

    pc = idata->cmd.buf;
    pc = imap_next_word (pc);
    pc = imap_next_word (pc);

    if (!ascii_strncasecmp ("FETCH", pc, 5))
    {
      while (*pc)
      {
	pc = imap_next_word (pc);
	if (pc[0] == '(')
	  pc++;
	if (ascii_strncasecmp ("UID", pc, 3) == 0)
	{
	  pc = imap_next_word (pc);
	  uid = atoi (pc);
	  if (uid != HEADER_DATA(ctx->hdrs[msgno])->uid)
	    mutt_error (_("The message index is incorrect. Try reopening the mailbox."));
	}
	else if ((ascii_strncasecmp ("RFC822", pc, 6) == 0) ||
		 (ascii_strncasecmp ("BODY[]", pc, 6) == 0))
	{
	  pc = imap_next_word (pc);
	  if (imap_get_literal_count(pc, &bytes) < 0)
	  {
	    imap_error ("imap_fetch_message()", buf);
	    goto bail;
	  }
	  if (imap_read_literal (msg->fp, idata, bytes) < 0)
	    goto bail;
	  /* pick up trailing line */
	  if ((rc = imap_cmd_step (idata)) != IMAP_CMD_CONTINUE)
	    goto bail;
	  pc = idata->cmd.buf;

	  fetched = 1;
	}
	/* UW-IMAP will provide a FLAGS update here if the FETCH causes a
	 * change (eg from \Unseen to \Seen).
	 * Uncommitted changes in mutt take precedence. If we decide to
	 * incrementally update flags later, this won't stop us syncing */
	else if ((ascii_strncasecmp ("FLAGS", pc, 5) == 0) &&
		 !ctx->hdrs[msgno]->changed)
	{
	  IMAP_HEADER newh;
	  unsigned char readonly;

	  h = ctx->hdrs[msgno];

	  memset (&newh, 0, sizeof (newh));
	  newh.data = safe_calloc (1, sizeof (IMAP_HEADER_DATA));

	  dprint (2, (debugfile, "imap_fetch_message: parsing FLAGS\n"));
	  if ((pc = msg_parse_flags (&newh, pc)) == NULL)
	    goto bail;
	      
	  /* this is less efficient than the code which used to be here,
	   * but (1) this is only invoked when fetching messages, and (2)
	   * this way, we can make sure that side effects of flag changes
	   * are taken account of the proper way.
	   */

	  /* YAUH (yet another ugly hack): temporarily set context to
	   * read-write even if it's read-only, so *server* updates of
	   * flags can be processed by mutt_set_flag. ctx->changed must
	   * be restored afterwards */
	  readonly = ctx->readonly;
	  ctx->readonly = 0;
	    
	  mutt_set_flag (ctx, h, M_NEW, 
			 !(newh.read || newh.old || h->read || h->old));
	  mutt_set_flag (ctx, h, M_OLD, newh.old);
	  mutt_set_flag (ctx, h, M_READ, h->read || newh.read);
	  mutt_set_flag (ctx, h, M_DELETE, h->deleted || newh.deleted);
	  mutt_set_flag (ctx, h, M_FLAG, h->flagged || newh.flagged);
	  mutt_set_flag (ctx, h, M_REPLIED, h->replied || newh.replied);

	  /* this message is now definitively *not* changed (mutt_set_flag
	   * marks things changed as a side-effect) */
	  h->changed = 0;
	  ctx->changed &= ~readonly;
	  ctx->readonly = readonly;

	  mutt_free_list (&(HEADER_DATA(h)->keywords));
	  HEADER_DATA(h)->keywords = newh.data->keywords;
	  FREE(&newh.data);
	}
      }
    }
  }
  while (rc == IMAP_CMD_CONTINUE);

  if (rc != IMAP_CMD_OK)
    goto bail;

  if (!fetched || !imap_code (idata->cmd.buf))
    goto bail;
    
  /* Update the header information.  Previously, we only downloaded a
   * portion of the headers, those required for the main display.
   */
  h = ctx->hdrs[msgno];
  rewind (msg->fp);
  /* It may be that the Status header indicates a message is read, but the
   * IMAP server doesn't know the message has been \Seen. So we capture
   * the server's notion of 'read' and if it differs from the message info
   * picked up in mutt_read_rfc822_header, we mark the message (and context
   * changed). Another possiblity: ignore Status on IMAP?*/
  read = h->read;
  /* I hate do this here, since it's so low-level, but I'm not sure where
   * I can abstract it. Problem: the id and subj hashes lose their keys when
   * mutt_free_envelope gets called, but keep their spots in the hash. This
   * confuses threading. Alternatively we could try to merge the new
   * envelope into the old one. Also messy and lowlevel. */
  if (h->env->message_id)
    hash_delete (ctx->id_hash, h->env->message_id, h, NULL);
  if (h->env->real_subj)
    hash_delete (ctx->subj_hash, h->env->real_subj, h, NULL);
  mutt_free_envelope (&h->env);
  h->env = mutt_read_rfc822_header (msg->fp, h, 0, 0);
  if (h->env->message_id)
    hash_insert (ctx->id_hash, h->env->message_id, h, 0);
  if (h->env->real_subj)
    hash_insert (ctx->subj_hash, h->env->real_subj, h, 1);

  /* see above. We want the new status in h->read, so we unset it manually
   * and let mutt_set_flag set it correctly, updating context. */
  if (read != h->read)
  {
    h->read = read;
    mutt_set_flag (ctx, h, M_NEW, read);
  }

  h->lines = 0;
  fgets (buf, sizeof (buf), msg->fp);
  while (!feof (msg->fp))
  {
    h->lines++;
    fgets (buf, sizeof (buf), msg->fp);
  }

  h->content->length = ftell (msg->fp) - h->content->offset;

  /* This needs to be done in case this is a multipart message */
#ifdef HAVE_PGP
  h->pgp = pgp_query (h->content);
#endif /* HAVE_PGP */

  mutt_clear_error();
  rewind (msg->fp);

  return 0;

bail:
  safe_fclose (&msg->fp);
  if (cache->path)
  {
    unlink (cache->path);
    FREE (&cache->path);
  }

  return -1;
}

int imap_append_message (CONTEXT *ctx, MESSAGE *msg)
{
  IMAP_DATA* idata;
  FILE *fp;
  char buf[LONG_STRING];
  char mbox[LONG_STRING];
  char mailbox[LONG_STRING]; 
  size_t len;
  int c, last;
  IMAP_MBOX mx;
  int rc;

  idata = (IMAP_DATA*) ctx->data;

  if (imap_parse_path (ctx->path, &mx))
    return -1;

  imap_fix_path (idata, mx.mbox, mailbox, sizeof (mailbox));
  
  if ((fp = fopen (msg->path, "r")) == NULL)
  {
    mutt_perror (msg->path);
    goto fail;
  }

  for (last = EOF, len = 0; (c = fgetc(fp)) != EOF; last = c)
  {
    if(c == '\n' && last != '\r')
      len++;

    len++;
  }
  rewind (fp);
  
  imap_munge_mbox_name (mbox, sizeof (mbox), mailbox);
  snprintf (buf, sizeof (buf), "APPEND %s {%d}", mbox, len);

  imap_cmd_start (idata, buf);

  do
    rc = imap_cmd_step (idata);
  while (rc == IMAP_CMD_CONTINUE);

  if (rc != IMAP_CMD_RESPOND)
  {
    char *pc;

    dprint (1, (debugfile, "imap_append_message(): command failed: %s\n",
		idata->cmd.buf));

    pc = idata->cmd.buf + SEQLEN;
    SKIPWS (pc);
    pc = imap_next_word (pc);
    mutt_error ("%s", pc);
    sleep (1);
    fclose (fp);
    goto fail;
  }

  mutt_message _("Uploading message ...");

  for (last = EOF, len = 0; (c = fgetc(fp)) != EOF; last = c)
  {
    if (c == '\n' && last != '\r')
      buf[len++] = '\r';

    buf[len++] = c;

    if (len > sizeof(buf) - 3)
      flush_buffer(buf, &len, idata->conn);
  }
  
  if (len)
    flush_buffer(buf, &len, idata->conn);

  mutt_socket_write (idata->conn, "\r\n");
  fclose (fp);

  do
    rc = imap_cmd_step (idata);
  while (rc == IMAP_CMD_CONTINUE);

  if (!imap_code (idata->cmd.buf))
  {
    char *pc;

    dprint (1, (debugfile, "imap_append_message(): command failed: %s\n",
		idata->cmd.buf));
    pc = idata->cmd.buf + SEQLEN;
    SKIPWS (pc);
    pc = imap_next_word (pc);
    mutt_error ("%s", pc);
    sleep (1);
    goto fail;
  }

  FREE (&mx.mbox);
  return 0;

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

/* imap_copy_messages: use server COPY command to copy messages to another
 *   folder.
 *   Return codes:
 *      -1: error
 *       0: success
 *       1: non-fatal error - try fetch/append */
int imap_copy_messages (CONTEXT* ctx, HEADER* h, char* dest, int delete)
{
  IMAP_DATA* idata;
  char buf[HUGE_STRING];
  char cmd[LONG_STRING];
  char mbox[LONG_STRING];
  char mmbox[LONG_STRING];
  int rc;
  int n;
  IMAP_MBOX mx;

  idata = (IMAP_DATA*) ctx->data;

  if (imap_parse_path (dest, &mx))
  {
    dprint (1, (debugfile, "imap_copy_message: bad destination %s\n", dest));
    return -1;
  }

  /* check that the save-to folder is in the same account */
  if (!mutt_account_match (&(CTX_DATA->conn->account), &(mx.account)))
  {
    dprint (3, (debugfile, "imap_copy_message: %s not same server as %s\n",
      dest, ctx->path));
    return 1;
  }

  imap_fix_path (idata, mx.mbox, cmd, sizeof (cmd));

  /* Null HEADER* means copy tagged messages */
  if (!h)
  {
    rc = imap_make_msg_set (idata, buf, sizeof (buf), M_TAG, 0);
    if (!rc)
    {
      dprint (1, (debugfile, "imap_copy_messages: No messages tagged\n"));
      goto fail;
    }
    mutt_message (_("Copying %d messages to %s..."), rc, cmd);
  }
  else
  {
    mutt_message (_("Copying message %d to %s..."), h->index+1, cmd);
    snprintf (buf, sizeof (buf), "%u", HEADER_DATA (h)->uid);
  }

  /* let's get it on */
  strncpy (mbox, cmd, sizeof (mbox));
  imap_munge_mbox_name (mmbox, sizeof (mmbox), cmd);
  snprintf (cmd, sizeof (cmd), "UID COPY %s %s", buf, mmbox);
  rc = imap_exec (idata, cmd, IMAP_CMD_FAIL_OK);
  if (rc == -2)
  {
    /* bail out if command failed for reasons other than nonexistent target */
    if (strncmp (imap_get_qualifier (idata->cmd.buf), "[TRYCREATE]", 11))
    {
      imap_error ("imap_copy_messages", idata->cmd.buf);
      goto fail;
    }
    dprint (2, (debugfile, "imap_copy_messages: server suggests TRYCREATE\n"));
    snprintf (buf, sizeof (buf), _("Create %s?"), mbox);
    if (option (OPTCONFIRMCREATE) && mutt_yesorno (buf, 1) < 1)
    {
      mutt_clear_error ();
      goto fail;
    }
    if (imap_create_mailbox (idata, mbox) < 0)
      goto fail;

    /* try again */
    rc = imap_exec (idata, cmd, 0);
  }
  if (rc != 0)
  {
    imap_error ("imap_copy_messages", idata->cmd.buf);
    goto fail;
  }

  /* cleanup */
  if (delete)
  {
    if (!h)
      for (n = 0; n < ctx->msgcount; n++)
      {
        if (ctx->hdrs[n]->tagged)
        {
          mutt_set_flag (ctx, ctx->hdrs[n], M_DELETE, 1);
          if (option (OPTDELETEUNTAG))
            mutt_set_flag (ctx, ctx->hdrs[n], M_TAG, 0);
        }
      }
    else
    {
      mutt_set_flag (ctx, h, M_DELETE, 1);
      if (option (OPTDELETEUNTAG))
        mutt_set_flag (ctx, h, M_TAG, 0);
    }
  }

  FREE (&mx.mbox);
  return 0;

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

/* imap_add_keywords: concatenate custom IMAP tags to list, if they
 *   appear in the folder flags list. Why wouldn't they? */
void imap_add_keywords (char* s, HEADER* h, LIST* mailbox_flags, size_t slen)
{
  LIST *keywords;

  if (!mailbox_flags || !HEADER_DATA(h) || !HEADER_DATA(h)->keywords)
    return;

  keywords = HEADER_DATA(h)->keywords->next;

  while (keywords)
  {
    if (msg_has_flag (mailbox_flags, keywords->data))
    {
      strncat (s, keywords->data, slen);
      strncat (s, " ", slen);
    }
    keywords = keywords->next;
  }
}

/* imap_free_header_data: free IMAP_HEADER structure */
void imap_free_header_data (void** data)
{
  /* this should be safe even if the list wasn't used */
  mutt_free_list (&(((IMAP_HEADER_DATA*) *data)->keywords));

  safe_free (data);
}

/* msg_fetch_header: import IMAP FETCH response into an IMAP_HEADER.
 *   Expects string beginning with * n FETCH.
 *   Returns:
 *      0 on success
 *     -1 if the string is not a fetch response
 *     -2 if the string is a corrupt fetch response */
static int msg_fetch_header (CONTEXT* ctx, IMAP_HEADER* h, char* buf, FILE* fp)
{
  IMAP_DATA* idata;
  long bytes;
  int rc = -1; /* default now is that string isn't FETCH response*/

  idata = (IMAP_DATA*) ctx->data;

  if (buf[0] != '*')
    return rc;
  
  /* skip to message number */
  buf = imap_next_word (buf);
  h->sid = atoi (buf);

  /* find FETCH tag */
  buf = imap_next_word (buf);
  if (ascii_strncasecmp ("FETCH", buf, 5))
    return rc;

  rc = -2; /* we've got a FETCH response, for better or worse */
  if (!(buf = strchr (buf, '(')))
    return rc;
  buf++;

  /* FIXME: current implementation - call msg_parse_fetch - if it returns -2,
   *   read header lines and call it again. Silly. */
  if (msg_parse_fetch (h, buf) != -2)
    return rc;
  
  if (imap_get_literal_count (buf, &bytes) < 0)
    return rc;
  imap_read_literal (fp, idata, bytes);

  /* we may have other fields of the FETCH _after_ the literal
   * (eg Domino puts FLAGS here). Nothing wrong with that, either.
   * This all has to go - we should accept literals and nonliterals
   * interchangeably at any time. */
  if (imap_cmd_step (idata) != IMAP_CMD_CONTINUE)
    return -2;
  
  if (msg_parse_fetch (h, idata->cmd.buf) == -1)
    return rc;

  rc = 0; /* success */
  
  /* subtract headers from message size - unfortunately only the subset of
   * headers we've requested. */
  h->content_length -= bytes;

  return rc;
}

/* msg_has_flag: do a caseless comparison of the flag against a flag list,
 *   return 1 if found or flag list has '\*', 0 otherwise */
static int msg_has_flag (LIST* flag_list, const char* flag)
{
  if (!flag_list)
    return 0;

  flag_list = flag_list->next;
  while (flag_list)
  {
    if (!ascii_strncasecmp (flag_list->data, flag, strlen (flag_list->data)))
      return 1;

    flag_list = flag_list->next;
  }

  return 0;
}

/* msg_parse_fetch: handle headers returned from header fetch */
static int msg_parse_fetch (IMAP_HEADER *h, char *s)
{
  char tmp[SHORT_STRING];
  char *ptmp;

  if (!s)
    return -1;

  while (*s)
  {
    SKIPWS (s);

    if (ascii_strncasecmp ("FLAGS", s, 5) == 0)
    {
      if ((s = msg_parse_flags (h, s)) == NULL)
        return -1;
    }
    else if (ascii_strncasecmp ("UID", s, 3) == 0)
    {
      s += 3;
      SKIPWS (s);
      h->data->uid = (unsigned int) atoi (s);

      s = imap_next_word (s);
    }
    else if (ascii_strncasecmp ("INTERNALDATE", s, 12) == 0)
    {
      s += 12;
      SKIPWS (s);
      if (*s != '\"')
      {
        dprint (1, (debugfile, "msg_parse_fetch(): bogus INTERNALDATE entry: %s\n", s));
        return -1;
      }
      s++;
      ptmp = tmp;
      while (*s && *s != '\"')
        *ptmp++ = *s++;
      if (*s != '\"')
        return -1;
      s++; /* skip past the trailing " */
      *ptmp = 0;
      h->received = imap_parse_date (tmp);
    }
    else if (ascii_strncasecmp ("RFC822.SIZE", s, 11) == 0)
    {
      s += 11;
      SKIPWS (s);
      ptmp = tmp;
      while (isdigit (*s))
        *ptmp++ = *s++;
      *ptmp = 0;
      h->content_length = atoi (tmp);
    }
    else if (!ascii_strncasecmp ("BODY", s, 4) ||
      !ascii_strncasecmp ("RFC822.HEADER", s, 13))
    {
      /* handle above, in msg_fetch_header */
      return -2;
    }
    else if (*s == ')')
      s++; /* end of request */
    else if (*s)
    {
      /* got something i don't understand */
      imap_error ("msg_parse_fetch", s);
      return -1;
    }
  }

  return 0;
}

/* msg_parse_flags: fill out the message header according to the flags from the
 *   server. Expects a flags line of the form "FLAGS (flag flag ...)" */
static char* msg_parse_flags (IMAP_HEADER* h, char* s)
{
  int recent = 0;

  /* sanity-check string */
  if (ascii_strncasecmp ("FLAGS", s, 5) != 0)
  {
    dprint (1, (debugfile, "msg_parse_flags: not a FLAGS response: %s\n",
      s));
    return NULL;
  }
  s += 5;
  SKIPWS(s);
  if (*s != '(')
  {
    dprint (1, (debugfile, "msg_parse_flags: bogus FLAGS response: %s\n",
      s));
    return NULL;
  }
  s++;

  /* start parsing */
  while (*s && *s != ')')
  {
    if (ascii_strncasecmp ("\\deleted", s, 8) == 0)
    {
      s += 8;
      h->deleted = 1;
    }
    else if (ascii_strncasecmp ("\\flagged", s, 8) == 0)
    {
      s += 8;
      h->flagged = 1;
    }
    else if (ascii_strncasecmp ("\\answered", s, 9) == 0)
    {
      s += 9;
      h->replied = 1;
    }
    else if (ascii_strncasecmp ("\\seen", s, 5) == 0)
    {
      s += 5;
      h->read = 1;
    }
    else if (ascii_strncasecmp ("\\recent", s, 5) == 0)
    {
      s += 7;
      recent = 1;
    }
    else
    {
      /* store custom flags as well */
      char ctmp;
      char* flag_word = s;

      if (!h->data->keywords)
        h->data->keywords = mutt_new_list ();

      while (*s && !ISSPACE (*s) && *s != ')')
        s++;
      ctmp = *s;
      *s = '\0';
      mutt_add_list (h->data->keywords, flag_word);
      *s = ctmp;
    }
    SKIPWS(s);
  }

  /* wrap up, or note bad flags response */
  if (*s == ')')
  {
    /* if a message is neither seen nor recent, it is OLD. */
    if (option (OPTMARKOLD) && !recent && !(h->read))
      h->old = 1;
    s++;
  }
  else
  {
    dprint (1, (debugfile,
      "msg_parse_flags: Unterminated FLAGS response: %s\n", s));
    return NULL;
  }

  return s;
}

static void flush_buffer(char *buf, size_t *len, CONNECTION *conn)
{
  buf[*len] = '\0';
  mutt_socket_write(conn, buf);
  *len = 0;
}