/*
 * 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.initiator = jn->initiator;
  accept.responder = jn->responder;
  accept.sid = jn->sid;
  accept.content = NULL;
  
  reject.action = JINGLE_CONTENT_REJECT;
  reject.initiator = jn->initiator;
  reject.responder = jn->responder;
  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;

  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);

  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);
  }
  
  if(g_slist_length(sess->content) == 0) {
    jingle_send_session_terminate(jn, "unsupported-applications");
    session_delete(sess);
    return;
  }
  
  // Send a session-accept
  
}

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);
}