/*
 * sessions.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/xmpp_helper.h>

#include <jingle/jingle.h>
#include <jingle/sessions.h>
#include <jingle/register.h>


static GSList *sessions;


/**
 * Create a new session and insert it in the linked list.
 */
JingleSession *session_new(const gchar *sid, const gchar *from,
                           const gchar *to, SessionOrigin origin)
{
  JingleSession *js = g_new0(JingleSession, 1);
  
  js->sid  = g_strdup(sid);
  js->from = g_strdup(from);
  js->to   = g_strdup(to);
  
  sessions = g_slist_append(sessions, js);
  return js;
}

JingleSession *session_new_from_jinglenode(JingleNode *jn)
{
  const gchar *from, *to;
  
  from = lm_message_node_get_attribute(jn->message->node, "from");
  to = lm_message_node_get_attribute(jn->message->node, "to");
  if (!from || !to) {
    return NULL;
  }

  return session_new(jn->sid, from, to, JINGLE_SESSION_INCOMING);
}

JingleSession *session_find_by_sid(const gchar *sid, const gchar *from)
{
  GSList *el;
  JingleSession *js;
  for (el = sessions; el; el = el->next) {
    js = (JingleSession*) el->data;
    if (g_strcmp0(js->sid, sid) && g_strcmp0(js->from, from)) {
      return js;
    }
  }
  return NULL;
}

JingleSession *session_find(const JingleNode *jn)
{
  const gchar *from = lm_message_get_from(jn->message);
  return session_find_by_sid(jn->sid, from);
}

void session_add_content(JingleSession *sess, const gchar *name,
                         SessionState state)
{
  SessionContent *sc = g_new0(SessionContent, 1);
  
  sc->name = name;
  sc->state = state;

  sess->content = g_slist_append(sess->content, sc);
}

void session_add_app(JingleSession *sess, const gchar *name,
                           const gchar *xmlns, gconstpointer data)
{
  SessionContent *sc = session_find_sessioncontent(sess, name);
  
  sc->xmlns_desc = xmlns;
  sc->appfuncs = jingle_get_appfuncs(xmlns);
  sc->description = data;
}

void session_add_trans(JingleSession *sess, const gchar *name,
                           const gchar *xmlns, gconstpointer data)
{
  SessionContent *sc = session_find_sessioncontent(sess, name);
  
  sc->xmlns_trans = xmlns;
  sc->transfuncs = jingle_get_transportfuncs(xmlns);
  sc->transport = data;
}

void session_add_content_from_jinglecontent(JingleSession *sess, JingleContent *cn,
                         SessionState state)
{
  SessionContent *sc = g_new0(SessionContent, 1);
  session_add_content(sess, cn->name, state);
  session_add_app(sess, cn->name,
                  lm_message_node_get_attribute(cn->description, "xmlns"),
                  sc->appfuncs->check(cn, NULL));
  session_add_trans(sess, cn->name,
                  lm_message_node_get_attribute(cn->transport, "xmlns"),
                  sc->transfuncs->check(cn, NULL));
}

SessionContent *session_find_sessioncontent(JingleSession *sess,
                                            const gchar *name)
{
  GSList *el;
  SessionContent *sc;
  for (el = sess->content; el; el = el->next) {
    sc = (SessionContent*) el->data;
    if (!g_strcmp0(sc->name, name))
      return sc;
  }
  return NULL;
}

SessionContent *session_find_transport(const gchar *xmlns_trans, gconstpointer data)
{
  GSList *el, *el1;
  JingleSession *sess;
  SessionContent *sc;
  for (el1 = sessions; el1; el1 = el1->next) {
    sess = (JingleSession*) el1->data;
    for (el = sess->content; el; el = el->next) {
      sc = (SessionContent*) el->data;
      if (!g_strcmp0(sc->xmlns_trans, xmlns_trans) && sc->transfuncs->cmp(sc->transport, data))
        return sc;
    }
  }
  return NULL;
}

void session_remove_sessioncontent(JingleSession *sess, const gchar *name)
{
  SessionContent *sc;
  sc = session_find_sessioncontent(sess, name);
  if(sc == NULL) return;

  if (sc->state == JINGLE_SESSION_STATE_ACTIVE); // We should stop the transfert

  sess->content = g_slist_remove(sess->content, sc);
}

void session_changestate_sessioncontent(JingleSession *sess, const gchar *name,
                                        SessionState state)
{
  SessionContent *sc;
  sc = session_find_sessioncontent(sess, name);
  if(sc != NULL)
    sc->state = state;
}

/**
 * Remove a session from the linked list and free it.
 */
void session_delete(JingleSession *sess)
{
  session_remove(sess);
  session_free(sess);
}

/**
 * Remove a session from the linked list.
 */
void session_remove(JingleSession *sess)
{
  sessions = g_slist_remove(sessions, sess);
}

/**
 * Free a session.
 */
void session_free(JingleSession *sess)
{
  g_free(sess->sid);
  g_free(sess->from);
  g_free(sess);
}

void jingle_handle_app(JingleSession *sess, const gchar *name,
                       const gchar *xmlns_app, gconstpointer app,
                       const gchar *to)
{
  JingleTransportFuncs *trans = jingle_transport_for_app(xmlns_app, NULL);
  
  if (trans == NULL)
    return;
  
  session_add_trans(sess, name, trans->xmlns(), trans->new());

  jingle_send_session_initiate(sess, to);
}