/*

 * jab_iq.c     -- Jabber protocol IQ-related fonctions

 *

 * Copyright (C) 2005 Mikael Berthe <bmikael@lists.lilotux.net>

 * Some parts initially came from the centericq project:

 * Copyright (C) 2002-2005 by Konstantin Klyagin <konst@konst.org.ua>

 * Some small parts come from the Gaim project <http://gaim.sourceforge.net/>

 *

 * 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 02111-1307

 * USA

 */

#include <sys/utsname.h>

#include <glib.h>

#include "jabglue.h"

#include "jab_priv.h"

#include "roster.h"

#include "utils.h"

#include "screen.h"

#include "settings.h"

static GSList *iqs_list;

//  iqs_new(type, namespace, prefix, timeout)

// Create a query (GET, SET) IQ structure.  This function should not be used

// for RESULT packets.

iqs *iqs_new(guint8 type, const char *ns, const char *prefix, time_t timeout)

{

  static guint iqs_idn;

  iqs *new_iqs;

  time_t now_t;

  iqs_idn++;

  new_iqs = g_new0(iqs, 1);

  time(&now_t);

  new_iqs->ts_create = now_t;

  if (timeout)

    new_iqs->ts_expire = now_t + timeout;

  new_iqs->type = type;

  new_iqs->xmldata = jutil_iqnew(type, (char*)ns);

  if (prefix)

    new_iqs->id = g_strdup_printf("%s%d", prefix, iqs_idn);

  else

    new_iqs->id = g_strdup_printf("%d", iqs_idn);

  xmlnode_put_attrib(new_iqs->xmldata, "id", new_iqs->id);

  iqs_list = g_slist_append(iqs_list, new_iqs);

  return new_iqs;

}

int iqs_del(const char *iqid)

{

  GSList *p;

  iqs *i;

  if (!iqid) return 1;

  for (p = iqs_list; p; p = g_slist_next(p)) {

    i = p->data;

    if (!strcmp(iqid, i->id))

      break;

  }

  if (p) {

    g_free(i->id);

    if (i->xmldata) xmlnode_free(i->xmldata);

    // XXX Should we free i->data?

    g_free(i);

    iqs_list = g_slist_remove(iqs_list, p->data);

    return 0; // Ok, deleted

  }

  return -1;  // Not found

}

static iqs *iqs_find(const char *iqid)

{

  GSList *p;

  iqs *i;

  if (!iqid) return NULL;

  for (p = iqs_list; p; p = g_slist_next(p)) {

    i = p->data;

    if (!strcmp(iqid, i->id))

      return i;

  }

  return NULL;

}

//  iqs_callback(iqid, xml_result)

// Callback processing for the iqid message.

// If we've received an answer, xml_result should point to the xmldata packet.

// If this is a timeout, xml_result should be NULL.

// Return 0 in case of success, -1 if the iqid hasn't been found.

int iqs_callback(const char *iqid, xmlnode xml_result)

{

  iqs *i;

  i = iqs_find(iqid);

  if (!i) return -1;

  // IQ processing

  // Note: If xml_result is NULL, this is a timeout

  if (i->callback)

    (*i->callback)(i, xml_result);

  iqs_del(iqid);

  return 0;

}

void iqs_check_timeout(void)

{

  GSList *p;

  iqs *i;

  time_t now_t;

  time(&now_t);

  for (p = iqs_list; p; p = g_slist_next(p)) {

    i = p->data;

    if ((!i->ts_expire && now_t > i->ts_create + IQS_MAX_TIMEOUT) ||

        (i->ts_expire && now_t > i->ts_expire)) {

      iqs_callback(i->id, NULL);

    }

  }

}

static void request_roster(void)

{

  iqs *iqn = iqs_new(JPACKET__GET, NS_ROSTER, "Roster", IQS_DEFAULT_TIMEOUT);

  jab_send(jc, iqn->xmldata);

  iqs_del(iqn->id); // XXX

}

static void handle_iq_roster(xmlnode x)

{

  xmlnode y;

  const char *jid, *name, *group, *sub, *ask;

  char *buddyname;

  char *cleanalias;

  enum subscr esub;

  int need_refresh = FALSE;

  guint roster_type;

  for (y = xmlnode_get_tag(x, "item"); y; y = xmlnode_get_nextsibling(y)) {

    gchar *name_noutf8 = NULL;

    gchar *group_noutf8 = NULL;

    jid = xmlnode_get_attrib(y, "jid");

    name = xmlnode_get_attrib(y, "name");

    sub = xmlnode_get_attrib(y, "subscription");

    ask = xmlnode_get_attrib(y, "ask");

    group = xmlnode_get_tag_data(y, "group");

    if (!jid)

      continue;

    buddyname = cleanalias = jidtodisp(jid);

    esub = sub_none;

    if (sub) {

      if (!strcmp(sub, "to"))          esub = sub_to;

      else if (!strcmp(sub, "from"))   esub = sub_from;

      else if (!strcmp(sub, "both"))   esub = sub_both;

      else if (!strcmp(sub, "remove")) esub = sub_remove;

    }

    if (esub == sub_remove) {

      roster_del_user(cleanalias);

      scr_LogPrint(LPRINT_LOGNORM, "Buddy <%s> has been removed "

                   "from the roster", cleanalias);

      g_free(cleanalias);

      need_refresh = TRUE;

      continue;

    }

    if (ask && !strcmp(ask, "subscribe"))

      esub |= sub_pending;

    if (name) {

      name_noutf8 = from_utf8(name);

      if (name_noutf8)

        buddyname = name_noutf8;

      else

        scr_LogPrint(LPRINT_LOG, "Decoding of buddy alias has failed: %s",

                     name);

    }

    if (group) {

      group_noutf8 = from_utf8(group);

      if (!group_noutf8)

        scr_LogPrint(LPRINT_LOG, "Decoding of buddy group has failed: %s",

                     group);

    }

    // Tricky... :-\  My guess is that if there is no '@', this is an agent

    if (strchr(cleanalias, '@'))

      roster_type = ROSTER_TYPE_USER;

    else

      roster_type = ROSTER_TYPE_AGENT;

    roster_add_user(cleanalias, buddyname, group_noutf8, roster_type, esub);

    if (name_noutf8)  g_free(name_noutf8);

    if (group_noutf8) g_free(group_noutf8);

    g_free(cleanalias);

  }

  buddylist_build();

  update_roster = TRUE;

  if (need_refresh)

    scr_ShowBuddyWindow();

}

static void handle_iq_result(jconn conn, char *from, xmlnode xmldata)

{

  xmlnode x;

  char *id;

  char *ns;

  id = xmlnode_get_attrib(xmldata, "id");

  if (!id) {

    scr_LogPrint(LPRINT_LOG, "IQ result stanza with no ID, ignored.");

    return;

  }

  if (!iqs_callback(id, xmldata))

    return;

  /*

  if (!strcmp(id, "VCARDreq")) {

    x = xmlnode_get_firstchild(xmldata);

    if (!x) x = xmldata;

    scr_LogPrint(LPRINT_LOGNORM, "Got VCARD");    // TODO

    return;

  } else if (!strcmp(id, "versionreq")) {

    scr_LogPrint(LPRINT_LOGNORM, "Got version");  // TODO

    return;

  }

  */

  x = xmlnode_get_tag(xmldata, "query");

  if (!x) return;

  ns = xmlnode_get_attrib(x, "xmlns");

  if (!ns) return;

  if (!strcmp(ns, NS_ROSTER)) {

    handle_iq_roster(x);

    // Post-login stuff

    // Usually we request the roster only at connection time

    // so we should be there only once.  (That's ugly, however)

    jb_setstatus(available, NULL, NULL);

  }

}

static void handle_iq_version(jconn conn, char *from, const char *id,

                              xmlnode xmldata)

{

  xmlnode senderquery, x;

  xmlnode myquery;

  char *os = NULL;

  // "from" has already been converted to user locale

  scr_LogPrint(LPRINT_LOGNORM, "Received an IQ version request from <%s>", from);

  senderquery = xmlnode_get_tag(xmldata, "query");

  if (!settings_opt_get_int("iq_version_hide_os")) {

    struct utsname osinfo;

    uname(&osinfo);

    os = g_strdup_printf("%s %s %s", osinfo.sysname, osinfo.release,

                         osinfo.machine);

  }

  x = jutil_iqnew(JPACKET__RESULT, NS_VERSION);

  xmlnode_put_attrib(x, "id", id);

  xmlnode_put_attrib(x, "to", xmlnode_get_attrib(xmldata, "from"));

  myquery = xmlnode_get_tag(x, "query");

  xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "name"), PACKAGE, -1);

  xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "version"), VERSION, -1);

  if (os) {

    xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "os"), os, -1);

    g_free(os);

  }

  jab_send(jc, x);

  xmlnode_free(x);

}

// This function borrows some code from the Gaim project

static void handle_iq_time(jconn conn, char *from, const char *id,

                              xmlnode xmldata)

{

  xmlnode senderquery, x;

  xmlnode myquery;

  char *buf, *utf8_buf;

  time_t now_t;

  struct tm *now;

  time(&now_t);

  now = localtime(&now_t);

  // "from" has already been converted to user locale

  scr_LogPrint(LPRINT_LOGNORM, "Received an IQ time request from <%s>", from);

  buf = g_new0(char, 512);

  senderquery = xmlnode_get_tag(xmldata, "query");

  x = jutil_iqnew(JPACKET__RESULT, NS_TIME);

  xmlnode_put_attrib(x, "id", id);

  xmlnode_put_attrib(x, "to", xmlnode_get_attrib(xmldata, "from"));

  myquery = xmlnode_get_tag(x, "query");

  strftime(buf, 512, "%Y%m%dT%T", now);

  xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "utc"), buf, -1);

  strftime(buf, 512, "%Z", now);

  if ((utf8_buf = to_utf8(buf))) {

    xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "tz"), utf8_buf, -1);

    g_free(utf8_buf);

  }

  strftime(buf, 512, "%d %b %Y %T", now);

  if ((utf8_buf = to_utf8(buf))) {

    xmlnode_insert_cdata(xmlnode_insert_tag(myquery, "display"), utf8_buf, -1);

    g_free(utf8_buf);

  }

  jab_send(jc, x);

  xmlnode_free(x);

  g_free(buf);

}

// This function borrows some code from the Gaim project

static void handle_iq_get(jconn conn, char *from, xmlnode xmldata)

{

  const char *id, *ns;

  xmlnode x, y, z;

  guint iq_not_implemented = FALSE;

  id = xmlnode_get_attrib(xmldata, "id");

  if (!id) {

    scr_LogPrint(LPRINT_LOG, "IQ get stanza with no ID, ignored.");

    return;

  }

  x = xmlnode_get_tag(xmldata, "query");

  ns = xmlnode_get_attrib(x, "xmlns");

  if (ns && !strcmp(ns, NS_VERSION)) {