/*

 * action-handlers.c

 *

 * Copyrigth (C) 2010 Nicolas Cornu <nicolas.cornu@ensi-bourges.fr>

 *

 * 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 <glib.h>

#include <mcabber/logprint.h>

#include <mcabber/xmpp_helper.h>

#include <mcabber/events.h>

#include <mcabber/hbuf.h>

#include <mcabber/utils.h>

#include <mcabber/screen.h>

#include <jingle/jingle.h>

#include <jingle/check.h>

#include <jingle/sessions.h>

#include <jingle/register.h>

#include <jingle/send.h>

#include <jingle/action-handlers.h>

extern LmMessageHandler* jingle_ack_iq_handler;

void handle_session_initiate(JingleNode *jn)

{

  GError *err = NULL;

  gboolean valid_disposition = FALSE;

  JingleContent *cn;

  gchar *sbuf;

  GSList *child = NULL;

  gchar *disp;

  JingleSession *sess;

  const gchar *xmlns;

  JingleAppFuncs *appfuncs;

  JingleTransportFuncs *transfuncs;

  // Make sure the request come from an user in our roster

  disp = jidtodisp(lm_message_get_from(jn->message));

  if (!roster_find(disp, jidsearch, 0)) {

    // We say that we doesn't support jingle.

    jingle_send_iq_error(jn->message, "cancel", "service-unavailable", NULL);

    g_free(disp);

    return;

  }

  if (!check_contents(jn, &err)) {

    scr_log_print(LPRINT_DEBUG, "jingle: One of the content element was invalid (%s)",

                  err->message);

    jingle_send_iq_error(jn->message, "cancel", "bad-request", NULL);

    g_free(disp);

    return;

  }

  // a session-initiate message must contains at least one <content> element

  if (g_slist_length(jn->content) < 1) {

    jingle_send_iq_error(jn->message, "cancel", "bad-request", NULL);

    g_free(disp);

    return;

  }

  /* When sending a session-initiate at least one <content/> element MUST have

   * a disposition of "session"); if this rule is violated, the responder MUST

   * return a <bad-request/> error to the initiator.

   */

  for (child = jn->content; child && !valid_disposition; child = child->next) {

    cn = (JingleContent*)(child->data);

    if (g_strcmp0(cn->disposition, "session") == 0 || cn->disposition == NULL)

      valid_disposition = TRUE;

  }

  if (!valid_disposition) {

    jingle_send_iq_error(jn->message, "cancel", "bad-request", NULL);

    g_free(disp);

    return;  

  }

  // if a session with the same sid already exists

  if (session_find(jn) != NULL) {

    jingle_send_iq_error(jn->message, "cancel", "unexpected-request", "out-of-order");

    g_free(disp);

    return;

  }

  jingle_ack_iq(jn->message);

  // We create a session

  sess = session_new_from_jinglenode(jn);

  for (child = jn->content; child; child = child->next) {

    SessionContent *sc;

    cn = (JingleContent *)(child->data);

    xmlns = lm_message_node_get_attribute(cn->description, "xmlns");

    appfuncs = jingle_get_appfuncs(xmlns);

    if (appfuncs == NULL) continue;

    xmlns = lm_message_node_get_attribute(cn->transport, "xmlns");

    transfuncs = jingle_get_transportfuncs(xmlns);

    if (transfuncs == NULL) continue;

    sc = session_add_content_from_jinglecontent(sess, cn,

                                                JINGLE_SESSION_STATE_PENDING,

                                                &err);

    if (err != NULL || sc == NULL) {

      scr_LogPrint(LPRINT_LOGNORM, "Cannot add a content: %s", err->message);

      g_error_free(err);

    }

  }

  if(g_slist_length(sess->content) == 0) {

    jingle_send_session_terminate(sess, "unsupported-applications");

    session_delete(sess);

    return;

  }

  // Wait that user accept the jingle

  sbuf = g_strdup_printf("Received an invitation for a jingle session from <%s>",

                  lm_message_get_from(jn->message));

  scr_WriteIncomingMessage(disp, sbuf, 0, HBB_PREFIX_INFO, 0);

  scr_LogPrint(LPRINT_LOGNORM, "%s", sbuf);

  g_free(sbuf);

  for (child = sess->content; child; child = child->next) {

    SessionContent *sc = (SessionContent *)child->data;

    gchar *app_info = sc->appfuncs->info(sc->description);

    gchar *trans_info = sc->transfuncs->info(sc->transport);

    sbuf = g_strdup_printf("%s using %s", app_info, trans_info);

    scr_WriteIncomingMessage(disp, sbuf, 0, HBB_PREFIX_INFO, 0);

    scr_LogPrint(LPRINT_LOGNORM, "%s", sbuf);

    g_free(app_info);

    g_free(trans_info);

    g_free(sbuf);

  }

  {

    const char *id;

    char *desc = g_strdup_printf("<%s> invites you to do a jingle session",

                                 lm_message_get_from(jn->message));

    id = evs_new(desc, NULL, 0, evscallback_jingle, sess, NULL);

    g_free(desc);

    if (id)

      sbuf = g_strdup_printf("Please use /event %s accept|reject", id);

    else

      sbuf = g_strdup_printf("Unable to create a new event!");

    scr_WriteIncomingMessage(disp, sbuf, 0, HBB_PREFIX_INFO, 0);

    scr_LogPrint(LPRINT_LOGNORM, "%s", sbuf);

    g_free(sbuf);

  }

  g_free(disp);

}

void handle_session_info(JingleNode *jn)

{

  JingleSession *sess;

  SessionContent *sc;

  GSList *el;

  if ((sess = session_find(jn)) == NULL) {

    jingle_send_iq_error(jn->message, "cancel", "item-not-found", "unknown-session");

    return;

  }

  /* "If either party receives an empty session-info message

   * for an active session, it MUST send an empty IQ result;

   * this usage functions as a "ping" to determine session

   * vitality via the XMPP signalling channel." */

  if (jn->node->children == NULL) {

    jingle_ack_iq(jn->message);

    return;

  }

  /* We don't know the app to which the message is addressed.

   * Only the app module itself may know, based on the element

   * name and its xmlns, so we need to try every app module. */

  for (el = sess->content; el; el = el->next) {

    sc = (SessionContent*)el->data;

    if (sc->appfuncs->handle == NULL)

      continue;

    if (sc->appfuncs->handle(JINGLE_SESSION_INFO, sc->description,

                             jn->node->children, NULL)) {

      jingle_ack_iq(jn->message);

      return;

	}

  }

  /* "If the party that receives an informational message

   * does not understand the payload, it MUST return a

   * <feature-not-implemented/> error with a Jingle-specific

   * error condition of <unsupported-info/>." */

  jingle_send_iq_error(jn->message, "modify", "feature-not-implemented",

                       "unsupported-info");

}

void handle_session_accept(JingleNode *jn)

{

  JingleSession *sess;

  JingleContent *jc;

  SessionContent *sc;

  session_content *sc2 = g_new0(session_content, 1);

  GSList *el;

  const gchar *from = lm_message_get_from(jn->message);

  // We're looking if the session exist

  sess = session_find_by_sid(jn->sid, from);

  if (sess == NULL) {

    jingle_send_iq_error(jn->message, "cancel", "item-not-found", "unknown-session");

    return;

  }

  if (!check_contents(jn, &err)) {

    scr_log_print(LPRINT_DEBUG, "jingle: One of the content element was invalid (%s)",

                  err->message);

    jingle_send_iq_error(jn->message, "cancel", "bad-request", NULL);

    return;

  }

  jingle_ack_iq(jn->message);

  sc2->sid  = sess->sid;

  sc2->from = (sess->origin == JINGLE_SESSION_INCOMING) ? sess->from : sess->to;

  for (el = jn->content; el; el = el->next) {

    jc = (JingleContent*)el->data;

    sc2->name = jc->name;

    sc = session_find_sessioncontent(sess, jc->name);

    if (sc == NULL) continue;

    session_changestate_sessioncontent(sess, jc->name,

                                       JINGLE_SESSION_STATE_ACTIVE);

    sc->transfuncs->handle(JINGLE_SESSION_ACCEPT, sc->transport, jc->transport, NULL);

    sc->transfuncs->init(sc2, sc->transport);

  }

  // We delete content who haven't been accepted

  for (el = sess->content; el; el = el->next) {

    sc = (SessionContent*) el->data;

    if (sc->state == JINGLE_SESSION_STATE_PENDING) {

      scr_log_print(LPRINT_DEBUG, "Delete %s!", sc->name);

      session_remove_sessioncontent(sess, sc->name);

    }

  }

  // Go go go! We start jobs!

  for (el = sess->content; el; el = el->next) {

    sc = (SessionContent*)el->data;

    sc2->name = sc->name;

    sc->appfuncs->start(sc2);

  }

}

void handle_session_terminate(JingleNode *jn)

{

  JingleSession *sess;

  GSList *el;

  SessionContent *sc;

  if ((sess = session_find(jn)) == NULL) {

    jingle_send_iq_error(jn->message, "cancel", "item-not-found", "unknown-session");

    return;

  }

  for (el = sess->content; el; el = el->next) {

    sc = (SessionContent*)el->data;

    if (!g_strcmp0(lm_message_get_from(jn->message),

             (sess->origin == JINGLE_SESSION_INCOMING) ? sess->from : sess->to))

      sc->appfuncs->stop(sc->description);

    session_remove_sessioncontent(sess, sc->name);

  }

  session_delete(sess);

  jingle_ack_iq(jn->message);

}