/*
 * Jingle call example
 * Copyright 2004--2005, Google Inc.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "talk/examples/call/presencepushtask.h"
#include "talk/xmpp/constants.h"
#include <sstream>


namespace buzz {

// string helper functions -----------------------------------------------------
template <class T> static
bool FromString(const std::string& s,
                 T * t) {
  std::istringstream iss(s);
  return !(iss>>*t).fail();
}

template <class T> static
bool ToString(const T &t,
               std::string* s) {
  std::ostringstream oss;
  oss << t;
  *s = oss.str();
  return !oss.fail();
}

static bool
IsXmlSpace(int ch) {
  return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t';
}

static bool
ListContainsToken(const std::string & list, const std::string & token) {
  size_t i = list.find(token);
  if (i == std::string::npos || token.empty())
    return false;
  bool boundary_before = (i == 0 || IsXmlSpace(list[i - 1]));
  bool boundary_after = (i == list.length() - token.length() || IsXmlSpace(list[i + token.length()]));
  return boundary_before && boundary_after;
}


bool
PresencePushTask::HandleStanza(const XmlElement * stanza) {
  if (stanza->Name() != TQN_PRESENCE)
    return false;
  if (stanza->HasAttr(TQN_TYPE) && stanza->Attr(TQN_TYPE) != STR_UNAVAILABLE)
    return false;
  QueueStanza(stanza);
  return true;
}

static bool IsUtf8FirstByte(int c) {
  return (((c)&0x80)==0) || // is single byte
    ((unsigned char)((c)-0xc0)<0x3e); // or is lead byte
}

int
PresencePushTask::ProcessStart() {
  const XmlElement * stanza = NextStanza();
  if (stanza == NULL)
    return STATE_BLOCKED;
  Status s;

  s.set_jid(Jid(stanza->Attr(TQN_FROM)));

  if (stanza->Attr(TQN_TYPE) == STR_UNAVAILABLE) {
    s.set_available(false);
    SignalStatusUpdate(s);
  }
  else {
    s.set_available(true);
    const XmlElement * status = stanza->FirstNamed(TQN_STATUS);
    if (status != NULL) {
      s.set_status(status->BodyText());

      // Truncate status messages longer than 300 bytes
      if (s.status().length() > 300) {
        size_t len = 300;

        // Be careful not to split legal utf-8 chars in half
        while (!IsUtf8FirstByte(s.status()[len]) && len > 0) {
          len -= 1;
        }
        std::string truncated(s.status(), 0, len);
        s.set_status(truncated);
      }
    }

    const XmlElement * priority = stanza->FirstNamed(TQN_PRIORITY);
    if (priority != NULL) {
      int pri;
      if (FromString(priority->BodyText(), &pri)) {
        s.set_priority(pri);
      }
    }

    const XmlElement * show = stanza->FirstNamed(TQN_SHOW);
    if (show == NULL || show->FirstChild() == NULL) {
      s.set_show(Status::SHOW_ONLINE);
    }
    else {
      if (show->BodyText() == "away") {
        s.set_show(Status::SHOW_AWAY);
      }
      else if (show->BodyText() == "xa") {
        s.set_show(Status::SHOW_XA);
      }
      else if (show->BodyText() == "dnd") {
        s.set_show(Status::SHOW_DND);
      }
      else if (show->BodyText() == "chat") {
        s.set_show(Status::SHOW_CHAT);
      }
      else {
        s.set_show(Status::SHOW_ONLINE);
      }
    }

    const XmlElement * caps = stanza->FirstNamed(TQN_CAPS_C);
    if (caps != NULL) {
      std::string node = caps->Attr(TQN_NODE);
      std::string ver = caps->Attr(TQN_VER);
      std::string exts = caps->Attr(TQN_EXT);

      s.set_know_capabilities(true);

      if (node == GOOGLE_CLIENT_NODE) {
        s.set_is_google_client(true);
        s.set_version(ver);
        if (ListContainsToken(exts, "voice-v1")) {
          s.set_phone_capability(true);
        }
      }
    }

    const XmlElement* delay = stanza->FirstNamed(kQnDelayX);
    if (delay != NULL) {
      // Ideally we would parse this according to the Psuedo ISO-8601 rules
      // that are laid out in JEP-0082:
      // http://www.jabber.org/jeps/jep-0082.html
      std::string stamp = delay->Attr(kQnStamp);
      s.set_sent_time(stamp);
    }

    SignalStatusUpdate(s);
  }

  return STATE_START;
}


}


