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/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999, 2001 Free Software Foundation, Inc.

   GNU Mailutils 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, or (at your option)
   any later version.

   GNU Mailutils 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 GNU Mailutils; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 USA */

#include "imap4d.h"

struct scan_data
{
  int result;
  char *name;
  FILE *tmp;
};

static int
scan_mailbox_list (char *filename,
		   int (*handler) (struct scan_data *data, char *name),
		   struct scan_data *data)
{
  FILE *fp;
  char buffer[124];

  fp = fopen (filename, "r");
  if (!fp)
    return -1;
    
  while (fgets (buffer, sizeof (buffer), fp))
    {
      size_t n = strlen (buffer);
      if (n && buffer[n - 1] == '\n')
	buffer[n - 1] = '\0';
      if (handler (data, buffer))
	break;
    }
  fclose (fp);
  return 0;
}

static int
scan_only (struct scan_data *data, char *name)
{
  if (strcmp (data->name, name) == 0)
    {
      data->result = 1;
      return 1;
    }
  return 0;
}

static int
unsubscribe (struct scan_data *data, char *name)
{
  if (strcmp (data->name, name))
    {
      fputs (name, data->tmp);
      fputs ("\n", data->tmp);
    }
  return 0;
}

int
imap4d_unsubscribe (struct imap4d_command *command, char *arg)
{
  char *sp = NULL;
  char *name;
  char *file;
  struct scan_data sd;
  int rc;
  
  name = util_getword (arg, &sp);
  util_unquote (&name);
  if (!name || *name == '\0')
    return util_finish (command, RESP_BAD, "Too few arguments");

  asprintf (&file, "%s/.mailboxlist", homedir);
  sd.result = 0;
  sd.name = name;

  rc = scan_mailbox_list (file, scan_only, &sd); 
  if (rc == 0)
    {
      if (sd.result)
	{
	  char *tmpname = NULL;
	  asprintf (&tmpname, "%s.%d", file, getpid ());
	  sd.tmp = fopen (tmpname, "a");
	  if (!sd.tmp)
	    rc = -1;
	  else
	    {
	      rc = scan_mailbox_list (file, unsubscribe, &sd);
	      fclose (sd.tmp);
	      if (rc == 0)
		rename (tmpname, file);
	    }
	  free (tmpname);
	}
    }

  free (file);
  if (rc)
    return util_finish (command, RESP_NO, "Can not unsubscribe");

  return util_finish (command, RESP_OK, "Completed");
}

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