/*

 * 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 <jingle/jingle.h>

#include <jingle/check.h>

#include <jingle/sessions.h>

#include <jingle/register.h>

#include <jingle/send.h>

#include <jingle/action-handlers.h>

void handle_content_accept(LmMessage *m, JingleNode *jn)

{

  GError *err = NULL;

  GSList *child = NULL;

  JingleContent *cn;

  JingleAppFuncs *appfuncs; 

  JingleTransportFuncs *transfuncs;

  gconstpointer description, transport;

  const gchar *xmlns;

  JingleSession *sess;

  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(m, "cancel", "bad-request", NULL);

    return;

  }

  /* it's better if there is at least one content elem */

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

    jingle_send_iq_error(m, "cancel", "bad-request", NULL);

    return;

  }

  // if a session with the same sid doesn't already exists

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

    jingle_send_iq_error(m, "cancel", "item-not-found", "unknown-session");

    return;

  }

  jingle_ack_iq(m);

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

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

    session_changestate_sessioncontent(sess, cn->name, ACTIVE);

  }

}

void handle_content_add(LmMessage *m, JingleNode *jn)

{

  GError *err = NULL;

  GSList *child = NULL;

  JingleContent *cn;

  JingleAppFuncs *appfuncs; 

  JingleTransportFuncs *transfuncs;

  gconstpointer description, transport;

  const gchar *xmlns;

  JingleSession *sess;

  JingleNode accept, reject;

  JingleContent tmp_cn;

  LmMessage *r;

  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(m, "cancel", "bad-request", NULL);

    return;

  }

  /* it's better if there is at least one content elem */

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

    jingle_send_iq_error(m, "cancel", "bad-request", NULL);

    return;

  }

  // if a session with the same sid doesn't already exists

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

    jingle_send_iq_error(m, "cancel", "item-not-found", "unknown-session");

    return;

  }

  jingle_ack_iq(m);

  accept.action = JINGLE_CONTENT_ACCEPT;

  accept.sid = jn->sid;

  accept.content = NULL;

  reject.action = JINGLE_CONTENT_REJECT;

  reject.sid = jn->sid;

  reject.content = NULL;

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

    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 (appfuncs == NULL) continue;

    description = appfuncs->check(cn, &err);

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

      reject.content = g_slist_append(reject.content, cn);

      continue;

    }

    transport = transfuncs->check(cn, &err);

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

      reject.content = g_slist_append(reject.content, cn);

      continue;

    }

    session_add_content(sess, cn, ACTIVE);

    accept.content = g_slist_append(accept.content, cn);

  }

  if (g_slist_length(accept.content) != 0) {

    r = lm_message_from_jinglenode(&accept, lm_message_get_from(m));

    if (r) {

      lm_connection_send(lconnection, r, NULL);

      lm_message_unref(r);

    }

  }

  if (g_slist_length(reject.content) != 0) {

    r = lm_message_from_jinglenode(&reject, lm_message_get_from(m));

    if (r) {

      lm_connection_send(lconnection, r, NULL);

      lm_message_unref(r);

    }

  }

}

void handle_content_reject(LmMessage *m, JingleNode *jn)

{

  GError *err = NULL;

  GSList *child = NULL;

  JingleContent *cn;

  JingleAppFuncs *appfuncs; 

  JingleTransportFuncs *transfuncs;

  gconstpointer description, transport;

  const gchar *xmlns;

  JingleSession *sess;

  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(m, "cancel", "bad-request", NULL);

    return;

  }

  /* it's better if there is at least one content elem */

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

    jingle_send_iq_error(m, "cancel", "bad-request", NULL);

    return;

  }

  // if a session with the same sid doesn't already exists

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

    jingle_send_iq_error(m, "cancel", "item-not-found", "unknown-session");

    return;

  }

  jingle_ack_iq(m);

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

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

    session_remove_sessioncontent(sess, cn->name);

  }

  // If there is nothing more to do, close the session

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

    jingle_send_session_terminate(jn, "success");

    session_delete(sess);

    return;

  }

}

void handle_content_remove(LmMessage *m, JingleNode *jn)

{

  GError *err = NULL;

  GSList *child = NULL;

  JingleContent *cn;

  JingleAppFuncs *appfuncs; 

  JingleTransportFuncs *transfuncs;

  gconstpointer description, transport;

  const gchar *xmlns;

  JingleSession *sess;

  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(m, "cancel", "bad-request", NULL);

    return;

  }

  /* it's better if there is at least one content elem */

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

    jingle_send_iq_error(m, "cancel", "bad-request", NULL);

    return;

  }

  // if a session with the same sid doesn't already exists

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

    jingle_send_iq_error(m, "cancel", "item-not-found", "unknown-session");

    return;

  }

  jingle_ack_iq(m);

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

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

    session_remove_sessioncontent(sess, cn->name);

  }

}

/* The session-initiate action is used to request negotiation of a new Jingle

 * session. When sending a session-initiate with one <content/> element, the

 * value of the <content/> element's 'disposition' attribute MUST be "session"

 * (if there are multiple <content/> elements then at least one MUST have a

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

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

 */

void handle_session_initiate(LmMessage *m, JingleNode *jn)

{

  GError *err = NULL;

  GSList *child = NULL;

  gboolean valid_disposition = FALSE;

  JingleContent *cn;

  JingleAppFuncs *appfuncs; 

  JingleTransportFuncs *transfuncs;

  gconstpointer description, transport;

  const gchar *xmlns;

  JingleSession* sess;

  JingleNode accept;

  LmMessage *r;

  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(m, "cancel", "bad-request", NULL);

    return;

  }

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

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

    jingle_send_iq_error(m, "cancel", "bad-request", NULL);

    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(m, "cancel", "bad-request", NULL);

    return;  

  }

  // if a session with the same sid already exists

  if (session_find(jn) != NULL) {

    jingle_send_iq_error(m, "cancel", "unexpected-request", "out-of-order");

    return;

  }

  jingle_ack_iq(m);

  accept.action = JINGLE_SESSION_ACCEPT;

  accept.sid = jn->sid;

  accept.content = NULL;

  sess = session_new(jn);

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

    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 (appfuncs == NULL) continue; // negociate another transport ?

    description = appfuncs->check(cn, &err);

    if (description == NULL || err != NULL) continue;

    transport = transfuncs->check(cn, &err);

    if (transport == NULL || err != NULL) continue;

    session_add_content(sess, cn, ACTIVE);

    accept.content = g_slist_append(accept.content, cn);

  }

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

    jingle_send_session_terminate(jn, "unsupported-applications");

    session_delete(sess);

    return;

  }

  // Send a session-accept

  if (g_slist_length(accept.content) != 0) {

    r = lm_message_from_jinglenode(&accept, lm_message_get_from(m));

    if (r) {

      lm_connection_send(lconnection, r, NULL);

      lm_message_unref(r);

    }

  }

}

void handle_session_terminate(LmMessage *m, JingleNode *jn)

{

  JingleSession *sess;

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

    jingle_send_iq_error(m, "cancel", "item-not-found", "unknown-session");

    return;

  }

  session_delete(sess);

  jingle_ack_iq(m);

}