/*
 * libjingle
 * Copyright 2011, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef TALK_XMPP_HANGOUTPUBSUBCLIENT_H_
#define TALK_XMPP_HANGOUTPUBSUBCLIENT_H_

#include <map>
#include <string>
#include <vector>

#include "talk/base/scoped_ptr.h"
#include "talk/base/sigslot.h"
#include "talk/base/sigslotrepeater.h"
#include "talk/xmpp/jid.h"
#include "talk/xmpp/pubsubclient.h"

// Gives a high-level API for MUC call PubSub needs such as
// presenter state, recording state, mute state, and remote mute.

namespace buzz {

class Jid;
class XmlElement;
class XmppTaskParentInterface;

// To handle retracts correctly, we need to remember certain details
// about an item.  We could just cache the entire XML element, but
// that would take more memory and require re-parsing.
struct StateItemInfo {
  std::string published_nick;
  std::string publisher_nick;
};

// Represents a PubSub state change.  Usually, the key is the nick,
// but not always.  It's a per-state-type thing.  Currently documented
// at https://docs.google.com/a/google.com/document/d/
// 1QyHu_ufyVdf0VICdfc_DtJbrOdrdIUm4eM73RZqnivI/edit?hl=en_US
template <typename C>
struct PubSubStateChange {
  // The nick of the user changing the state.
  std::string publisher_nick;
  // The nick of the user whose state is changing.
  std::string published_nick;
  C old_state;
  C new_state;
};

template <typename C> class PubSubStateClient;

// A client tied to a specific MUC jid and local nick.  Provides ways
// to get updates and publish state and events.  Must call
// RequestAll() to start getting updates.
class HangoutPubSubClient : public sigslot::has_slots<> {
 public:
  HangoutPubSubClient(XmppTaskParentInterface* parent,
                      const Jid& mucjid,
                      const std::string& nick);
  ~HangoutPubSubClient();
  const Jid& mucjid() const { return mucjid_; }
  const std::string& nick() const { return nick_; }

  // Requests all of the different states and subscribes for updates.
  // Responses and updates will be signalled via the various signals.
  void RequestAll();
  // Signal (nick, was_presenting, is_presenting)
  sigslot::signal3<const std::string&, bool, bool> SignalPresenterStateChange;
  // Signal (nick, was_muted, is_muted)
  sigslot::signal3<const std::string&, bool, bool> SignalAudioMuteStateChange;
  // Signal (nick, was_recording, is_recording)
  sigslot::signal3<const std::string&, bool, bool> SignalRecordingStateChange;
  // Signal (mutee_nick, muter_nick, should_mute_locally)
  sigslot::signal3<const std::string&,
                   const std::string&,
                   bool> SignalRemoteMute;
  // Signal (blockee_nick, blocker_nick)
  sigslot::signal2<const std::string&, const std::string&> SignalMediaBlock;

  // Signal (node, error stanza)
  sigslot::signal2<const std::string&, const XmlElement*> SignalRequestError;

  // On each of these, provide a task_id_out to get the task_id, which
  // can be correlated to the error and result signals.
  void PublishPresenterState(
      bool presenting, std::string* task_id_out = NULL);
  void PublishAudioMuteState(
      bool muted, std::string* task_id_out = NULL);
  void PublishRecordingState(
      bool recording, std::string* task_id_out = NULL);
  void RemoteMute(
      const std::string& mutee_nick, std::string* task_id_out = NULL);
  void BlockMedia(
      const std::string& blockee_nick, std::string* task_id_out = NULL);

  // Signal task_id
  sigslot::signal1<const std::string&> SignalPublishAudioMuteResult;
  sigslot::signal1<const std::string&> SignalPublishPresenterResult;
  sigslot::signal1<const std::string&> SignalPublishRecordingResult;
  // Signal (task_id, mutee_nick)
  sigslot::signal2<const std::string&,
                   const std::string&> SignalRemoteMuteResult;
  // Signal (task_id, blockee_nick)
  sigslot::signal2<const std::string&,
                   const std::string&> SignalMediaBlockResult;

  // Signal (task_id, error stanza)
  sigslot::signal2<const std::string&,
                   const XmlElement*> SignalPublishAudioMuteError;
  sigslot::signal2<const std::string&,
                   const XmlElement*> SignalPublishPresenterError;
  sigslot::signal2<const std::string&,
                   const XmlElement*> SignalPublishRecordingError;
  sigslot::signal2<const std::string&,
                   const XmlElement*> SignalPublishMediaBlockError;
  // Signal (task_id, mutee_nick, error stanza)
  sigslot::signal3<const std::string&,
                   const std::string&,
                   const XmlElement*> SignalRemoteMuteError;
  // Signal (task_id, blockee_nick, error stanza)
  sigslot::signal3<const std::string&,
                   const std::string&,
                   const XmlElement*> SignalMediaBlockError;


 private:
  void OnPresenterRequestError(PubSubClient* client,
                               const XmlElement* stanza);
  void OnMediaRequestError(PubSubClient* client,
                           const XmlElement* stanza);

  void OnPresenterStateChange(const PubSubStateChange<bool>& change);
  void OnPresenterPublishResult(const std::string& task_id,
                               const XmlElement* item);
  void OnPresenterPublishError(const std::string& task_id,
                               const XmlElement* item,
                               const XmlElement* stanza);
  void OnAudioMuteStateChange(const PubSubStateChange<bool>& change);
  void OnAudioMutePublishResult(const std::string& task_id,
                               const XmlElement* item);
  void OnAudioMutePublishError(const std::string& task_id,
                               const XmlElement* item,
                               const XmlElement* stanza);
  void OnRecordingStateChange(const PubSubStateChange<bool>& change);
  void OnRecordingPublishResult(const std::string& task_id,
                               const XmlElement* item);
  void OnRecordingPublishError(const std::string& task_id,
                               const XmlElement* item,
                               const XmlElement* stanza);
  void OnMediaBlockStateChange(const PubSubStateChange<bool>& change);
  void OnMediaBlockPublishResult(const std::string& task_id,
                                 const XmlElement* item);
  void OnMediaBlockPublishError(const std::string& task_id,
                                const XmlElement* item,
                                const XmlElement* stanza);
  Jid mucjid_;
  std::string nick_;
  talk_base::scoped_ptr<PubSubClient> media_client_;
  talk_base::scoped_ptr<PubSubClient> presenter_client_;
  talk_base::scoped_ptr<PubSubStateClient<bool> > presenter_state_client_;
  talk_base::scoped_ptr<PubSubStateClient<bool> > audio_mute_state_client_;
  talk_base::scoped_ptr<PubSubStateClient<bool> > recording_state_client_;
  talk_base::scoped_ptr<PubSubStateClient<bool> > media_block_state_client_;
};

}  // namespace buzz

#endif  // TALK_XMPP_HANGOUTPUBSUBCLIENT_H_