path: root/libempathy/empathy-tp-chat.c

/*
 * Copyright (C) 2007-2012 Collabora Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Authors: Xavier Claessens <xclaesse@gmail.com>
 */

#include <config.h>

#include <string.h>

#include <telepathy-glib/telepathy-glib.h>

#include <extensions/extensions.h>

#include "empathy-tp-chat.h"
#include "empathy-tp-contact-factory.h"
#include "empathy-contact-list.h"
#include "empathy-request-util.h"
#include "empathy-time.h"
#include "empathy-utils.h"

#define DEBUG_FLAG EMPATHY_DEBUG_TP | EMPATHY_DEBUG_CHAT
#include "empathy-debug.h"

struct _EmpathyTpChatPrivate
{
  TpAccount *account;
  EmpathyContact *user;
  EmpathyContact *remote_contact;
  GList *members;
  /* Queue of messages not signalled yet */
  GQueue *messages_queue;
  /* Queue of messages signalled but not acked yet */
  GQueue *pending_messages_queue;

  /* Subject */
  gboolean supports_subject;
  gboolean can_set_subject;
  gchar *subject;
  gchar *subject_actor;

  /* Room config (for now, we only track the title and don't support
   * setting it) */
  gchar *title;

  gboolean can_upgrade_to_muc;

  GHashTable *messages_being_sent;

  /* GSimpleAsyncResult used when preparing EMPATHY_TP_CHAT_FEATURE_CORE */
  GSimpleAsyncResult *ready_result;
};

static void tp_chat_iface_init (EmpathyContactListIface *iface);

enum
{
  PROP_0,
  PROP_ACCOUNT,
  PROP_SELF_CONTACT,
  PROP_REMOTE_CONTACT,
  PROP_N_MESSAGES_SENDING,
  PROP_TITLE,
  PROP_SUBJECT,
};

enum
{
  MESSAGE_RECEIVED,
  SEND_ERROR,
  CHAT_STATE_CHANGED,
  MESSAGE_ACKNOWLEDGED,
  LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE_WITH_CODE (EmpathyTpChat, empathy_tp_chat, TP_TYPE_TEXT_CHANNEL,
       G_IMPLEMENT_INTERFACE (EMPATHY_TYPE_CONTACT_LIST,
            tp_chat_iface_init));

static void
tp_chat_set_delivery_status (EmpathyTpChat *self,
    const gchar *token,
    EmpathyDeliveryStatus delivery_status)
{
  TpDeliveryReportingSupportFlags flags =
    tp_text_channel_get_delivery_reporting_support (
      TP_TEXT_CHANNEL (self));

  /* channel must support receiving failures and successes */
  if (!tp_str_empty (token) &&
      flags & TP_DELIVERY_REPORTING_SUPPORT_FLAG_RECEIVE_FAILURES &&
      flags & TP_DELIVERY_REPORTING_SUPPORT_FLAG_RECEIVE_SUCCESSES)
    {
      DEBUG ("Delivery status (%s) = %u", token, delivery_status);

      switch (delivery_status)
        {
          case EMPATHY_DELIVERY_STATUS_NONE:
            g_hash_table_remove (self->priv->messages_being_sent,
              token);
            break;

          default:
            g_hash_table_insert (self->priv->messages_being_sent,
              g_strdup (token),
              GUINT_TO_POINTER (delivery_status));
            break;
        }

    g_object_notify (G_OBJECT (self), "n-messages-sending");
  }
}

static void tp_chat_prepare_ready_async (TpProxy *proxy,
  const TpProxyFeature *feature,
  GAsyncReadyCallback callback,
  gpointer user_data);

static void
tp_chat_async_cb (TpChannel *proxy,
    const GError *error,
    gpointer user_data,
    GObject *weak_object)
{
  if (error != NULL)
    DEBUG ("Error %s: %s", (gchar *) user_data, error->message);
}

static void
create_conference_cb (GObject *source,
    GAsyncResult *result,
    gpointer user_data)
{
  GError *error = NULL;

  if (!tp_account_channel_request_create_channel_finish (
      TP_ACCOUNT_CHANNEL_REQUEST (source), result, &error))
    {
      DEBUG ("Failed to create conference channel: %s", error->message);
      g_error_free (error);
    }
}

void
empathy_tp_chat_add (EmpathyTpChat *self,
    EmpathyContact *contact,
    const gchar *message)
{
  TpChannel *channel = (TpChannel *) self;

  if (tp_proxy_has_interface_by_id (self,
    TP_IFACE_QUARK_CHANNEL_INTERFACE_GROUP))
    {
      TpHandle handle;
      GArray handles = {(gchar *) &handle, 1};

      g_return_if_fail (EMPATHY_IS_CONTACT (contact));

      handle = empathy_contact_get_handle (contact);
      tp_cli_channel_interface_group_call_add_members (channel,
        -1, &handles, NULL, NULL, NULL, NULL, NULL);
    }
  else if (self->priv->can_upgrade_to_muc)
    {
      TpAccountChannelRequest *req;
      GHashTable *props;
      const char *object_path;
      GPtrArray channels = { (gpointer *) &object_path, 1 };
      const char *invitees[2] = { NULL, };

      invitees[0] = empathy_contact_get_id (contact);
      object_path = tp_proxy_get_object_path (self);

      props = tp_asv_new (
          TP_PROP_CHANNEL_CHANNEL_TYPE, G_TYPE_STRING,
              TP_IFACE_CHANNEL_TYPE_TEXT,
          TP_PROP_CHANNEL_TARGET_HANDLE_TYPE, G_TYPE_UINT,
              TP_HANDLE_TYPE_NONE,
          TP_PROP_CHANNEL_INTERFACE_CONFERENCE_INITIAL_CHANNELS,
              TP_ARRAY_TYPE_OBJECT_PATH_LIST, &channels,
          TP_PROP_CHANNEL_INTERFACE_CONFERENCE_INITIAL_INVITEE_IDS,
              G_TYPE_STRV, invitees,
          /* FIXME: InvitationMessage ? */
          NULL);

      req = tp_account_channel_request_new (self->priv->account, props,
        TP_USER_ACTION_TIME_NOT_USER_ACTION);

      /* Although this is a MUC, it's anonymous, so CreateChannel is
       * valid. */
      tp_account_channel_request_create_channel_async (req,
          EMPATHY_CHAT_BUS_NAME, NULL, create_conference_cb, NULL);

      g_object_unref (req);
      g_hash_table_unref (props);
    }
  else
    {
      g_warning ("Cannot add to this channel");
    }
}

static GList *
tp_chat_get_members (EmpathyContactList *list)
{
  EmpathyTpChat *self = (EmpathyTpChat *) list;
  GList *members = NULL;

  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (list), NULL);

  if (self->priv->members)
    {
      members = g_list_copy (self->priv->members);
      g_list_foreach (members, (GFunc) g_object_ref, NULL);
    }
  else
    {
      members = g_list_prepend (members, g_object_ref (self->priv->user));

      if (self->priv->remote_contact != NULL)
        members = g_list_prepend (members,
            g_object_ref (self->priv->remote_contact));
    }

  return members;
}

static void
check_ready (EmpathyTpChat *self)
{
  if (self->priv->ready_result == NULL)
    return;

  if (g_queue_get_length (self->priv->messages_queue) > 0)
    return;

  DEBUG ("Ready");

  g_simple_async_result_complete (self->priv->ready_result);
  tp_clear_object (&self->priv->ready_result);
}

static void
tp_chat_emit_queued_messages (EmpathyTpChat *self)
{
  EmpathyMessage *message;

  /* Check if we can now emit some queued messages */
  while ((message = g_queue_peek_head (self->priv->messages_queue)) != NULL)
    {
      if (empathy_message_get_sender (message) == NULL)
        break;

      DEBUG ("Queued message ready");
      g_queue_pop_head (self->priv->messages_queue);
      g_queue_push_tail (self->priv->pending_messages_queue, message);
      g_signal_emit (self, signals[MESSAGE_RECEIVED], 0, message);
    }

  check_ready (self);
}

static void
tp_chat_got_sender_cb (TpConnection *connection,
    EmpathyContact *contact,
    const GError *error,
    gpointer message,
    GObject *chat)
{
  EmpathyTpChat *self = (EmpathyTpChat *) chat;

  if (error)
    {
      DEBUG ("Error: %s", error->message);
      /* Do not block the message queue, just drop this message */
      g_queue_remove (self->priv->messages_queue, message);
    }
  else
    {
      empathy_message_set_sender (message, contact);
    }

  tp_chat_emit_queued_messages (EMPATHY_TP_CHAT (self));
}

static void
tp_chat_build_message (EmpathyTpChat *self,
    TpMessage *msg,
    gboolean incoming)
{
  EmpathyMessage *message;
  TpContact *sender;

  message = empathy_message_new_from_tp_message (msg, incoming);
  /* FIXME: this is actually a lie for incoming messages. */
  empathy_message_set_receiver (message, self->priv->user);

  g_queue_push_tail (self->priv->messages_queue, message);

  sender = tp_signalled_message_get_sender (msg);
  g_assert (sender != NULL);

  if (tp_contact_get_handle (sender) == 0)
    {
      empathy_message_set_sender (message, self->priv->user);
      tp_chat_emit_queued_messages (self);
    }
  else
    {
      TpConnection *connection = tp_channel_borrow_connection (
        (TpChannel *) self);

      empathy_tp_contact_factory_get_from_handle (connection,
        tp_contact_get_handle (sender),
        tp_chat_got_sender_cb,
        message, NULL, G_OBJECT (self));
    }
}

static void
handle_delivery_report (EmpathyTpChat *self,
    TpMessage *message)
{
  TpDeliveryStatus delivery_status;
  const GHashTable *header;
  TpChannelTextSendError delivery_error;
  gboolean valid;
  GPtrArray *echo;
  const gchar *message_body = NULL;
  const gchar *delivery_dbus_error;
  const gchar *delivery_token = NULL;

  header = tp_message_peek (message, 0);
  if (header == NULL)
    goto out;

  delivery_token = tp_asv_get_string (header, "delivery-token");
  delivery_status = tp_asv_get_uint32 (header, "delivery-status", &valid);

  if (!valid)
    {
      goto out;
    }
  else if (delivery_status == TP_DELIVERY_STATUS_ACCEPTED)
    {
      DEBUG ("Accepted %s", delivery_token);
      tp_chat_set_delivery_status (self, delivery_token,
        EMPATHY_DELIVERY_STATUS_ACCEPTED);
      goto out;
    }
  else if (delivery_status == TP_DELIVERY_STATUS_DELIVERED)
    {
      DEBUG ("Delivered %s", delivery_token);
      tp_chat_set_delivery_status (self, delivery_token,
        EMPATHY_DELIVERY_STATUS_NONE);
      goto out;
    }
  else if (delivery_status != TP_DELIVERY_STATUS_PERMANENTLY_FAILED &&
       delivery_status != TP_DELIVERY_STATUS_TEMPORARILY_FAILED)
    {
      goto out;
    }

  delivery_error = tp_asv_get_uint32 (header, "delivery-error", &valid);
  if (!valid)
    delivery_error = TP_CHANNEL_TEXT_SEND_ERROR_UNKNOWN;

  delivery_dbus_error = tp_asv_get_string (header, "delivery-dbus-error");

  /* TODO: ideally we should use tp-glib API giving us the echoed message as a
   * TpMessage. (fdo #35884) */
  echo = tp_asv_get_boxed (header, "delivery-echo",
    TP_ARRAY_TYPE_MESSAGE_PART_LIST);
  if (echo != NULL && echo->len >= 2)
    {
      const GHashTable *echo_body;

      echo_body = g_ptr_array_index (echo, 1);
      if (echo_body != NULL)
        message_body = tp_asv_get_string (echo_body, "content");
    }

  tp_chat_set_delivery_status (self, delivery_token,
      EMPATHY_DELIVERY_STATUS_NONE);
  g_signal_emit (self, signals[SEND_ERROR], 0, message_body,
      delivery_error, delivery_dbus_error);

out:
  tp_text_channel_ack_message_async (TP_TEXT_CHANNEL (self),
    message, NULL, NULL);
}

static void
handle_incoming_message (EmpathyTpChat *self,
    TpMessage *message,
    gboolean pending)
{
  gchar *message_body;

  if (tp_message_is_delivery_report (message))
    {
      handle_delivery_report (self, message);
      return;
    }

  message_body = tp_message_to_text (message, NULL);

  DEBUG ("Message %s (channel %s): %s",
    pending ? "pending" : "received",
    tp_proxy_get_object_path (self), message_body);

  if (message_body == NULL)
    {
      DEBUG ("Empty message with NonTextContent, ignoring and acking.");

      tp_text_channel_ack_message_async (TP_TEXT_CHANNEL (self),
        message, NULL, NULL);
      return;
    }

  tp_chat_build_message (self, message, TRUE);

  g_free (message_body);
}

static void
message_received_cb (TpTextChannel *channel,
    TpMessage *message,
    EmpathyTpChat *self)
{
  handle_incoming_message (self, message, FALSE);
}

static gboolean
find_pending_message_func (gconstpointer a,
    gconstpointer b)
{
  EmpathyMessage *msg = (EmpathyMessage *) a;
  TpMessage *message = (TpMessage *) b;

  if (empathy_message_get_tp_message (msg) == message)
    return 0;

  return -1;
}

static void
pending_message_removed_cb (TpTextChannel   *channel,
    TpMessage *message,
    EmpathyTpChat *self)
{
  GList *m;

  m = g_queue_find_custom (self->priv->pending_messages_queue, message,
      find_pending_message_func);

  if (m == NULL)
    return;

  g_signal_emit (self, signals[MESSAGE_ACKNOWLEDGED], 0, m->data);

  g_object_unref (m->data);
  g_queue_delete_link (self->priv->pending_messages_queue, m);
}

static void
message_sent_cb (TpTextChannel *channel,
    TpMessage *message,
    TpMessageSendingFlags flags,
    gchar *token,
    EmpathyTpChat *self)
{
  gchar *message_body;

  message_body = tp_message_to_text (message, NULL);

  DEBUG ("Message sent: %s", message_body);

  tp_chat_build_message (self, message, FALSE);

  g_free (message_body);
}

static TpChannelTextSendError
error_to_text_send_error (GError *error)
{
  if (error->domain != TP_ERRORS)
    return TP_CHANNEL_TEXT_SEND_ERROR_UNKNOWN;

  switch (error->code)
    {
      case TP_ERROR_OFFLINE:
        return TP_CHANNEL_TEXT_SEND_ERROR_OFFLINE;
      case TP_ERROR_INVALID_HANDLE:
        return TP_CHANNEL_TEXT_SEND_ERROR_INVALID_CONTACT;
      case TP_ERROR_PERMISSION_DENIED:
        return TP_CHANNEL_TEXT_SEND_ERROR_PERMISSION_DENIED;
      case TP_ERROR_NOT_IMPLEMENTED:
        return TP_CHANNEL_TEXT_SEND_ERROR_NOT_IMPLEMENTED;
    }

  return TP_CHANNEL_TEXT_SEND_ERROR_UNKNOWN;
}

static void
message_send_cb (GObject *source,
     GAsyncResult *result,
     gpointer user_data)
{
  EmpathyTpChat *self = user_data;
  TpTextChannel *channel = (TpTextChannel *) source;
  gchar *token = NULL;
  GError *error = NULL;

  if (!tp_text_channel_send_message_finish (channel, result, &token, &error))
    {
      DEBUG ("Error: %s", error->message);

      /* FIXME: we should use the body of the message as first argument of the
       * signal but can't easily get it as we just get a user_data pointer. Once
       * we'll have rebased EmpathyTpChat on top of TpTextChannel we'll be able
       * to use the user_data pointer to pass the message and fix this. */
      g_signal_emit (self, signals[SEND_ERROR], 0,
               NULL, error_to_text_send_error (error), NULL);

      g_error_free (error);
    }

  tp_chat_set_delivery_status (self, token,
    EMPATHY_DELIVERY_STATUS_SENDING);
  g_free (token);
}

typedef struct {
  EmpathyTpChat *chat;
  TpChannelChatState state;
} StateChangedData;

static void
tp_chat_state_changed_got_contact_cb (TpConnection *connection,
    EmpathyContact *contact,
    const GError *error,
    gpointer user_data,
    GObject *chat)
{
  TpChannelChatState state;

  if (error != NULL)
    {
      DEBUG ("Error: %s", error->message);
      return;
    }

  state = GPOINTER_TO_UINT (user_data);
  DEBUG ("Chat state changed for %s (%d): %d",
    empathy_contact_get_alias (contact),
    empathy_contact_get_handle (contact), state);

  g_signal_emit (chat, signals[CHAT_STATE_CHANGED], 0, contact, state);
}

static void
tp_chat_state_changed_cb (TpChannel *channel,
    TpHandle handle,
    TpChannelChatState state,
    EmpathyTpChat *self)
{
  TpConnection *connection = tp_channel_borrow_connection (
    (TpChannel *) self);

  empathy_tp_contact_factory_get_from_handle (connection, handle,
    tp_chat_state_changed_got_contact_cb, GUINT_TO_POINTER (state),
    NULL, G_OBJECT (self));
}

static void
list_pending_messages (EmpathyTpChat *self)
{
  GList *messages, *l;

  messages = tp_text_channel_get_pending_messages (TP_TEXT_CHANNEL (self));

  for (l = messages; l != NULL; l = g_list_next (l))
    {
      TpMessage *message = l->data;

      handle_incoming_message (self, message, FALSE);
    }

  g_list_free (messages);
}

static void
update_subject (EmpathyTpChat *self,
    GHashTable *properties)
{
  gboolean can_set, valid;
  const gchar *subject;

  can_set = tp_asv_get_boolean (properties, "CanSet", &valid);
  if (valid)
    self->priv->can_set_subject = can_set;

  subject = tp_asv_get_string (properties, "Subject");
  if (subject != NULL)
    {
      const gchar *actor;

      g_free (self->priv->subject);
      self->priv->subject = g_strdup (subject);

      /* If the actor is included with this update, use it;
       * otherwise, clear it to avoid showing stale information.
       * Why might it not be included? When you join an IRC channel,
       * you get a pair of messages: first, the current topic; next,
       * who set it, and when. Idle reports these in two separate
       * signals.
       */
      actor = tp_asv_get_string (properties, "Actor");
      g_free (self->priv->subject_actor);
      self->priv->subject_actor = g_strdup (actor);

      g_object_notify (G_OBJECT (self), "subject");
    }

  /* TODO: track Timestamp. */
}

static void
tp_chat_get_all_subject_cb (TpProxy *proxy,
    GHashTable *properties,
    const GError *error,
    gpointer user_data G_GNUC_UNUSED,
    GObject *chat)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (chat);

  if (error != NULL)
    {
      DEBUG ("Error fetching subject: %s", error->message);
      return;
    }

  self->priv->supports_subject = TRUE;
  update_subject (self, properties);
}

static void
update_title (EmpathyTpChat *self,
    GHashTable *properties)
{
  const gchar *title = tp_asv_get_string (properties, "Title");

  if (title != NULL)
    {
      if (tp_str_empty (title))
        title = NULL;

      g_free (self->priv->title);
      self->priv->title = g_strdup (title);
      g_object_notify (G_OBJECT (self), "title");
    }
}

static void
tp_chat_get_all_room_config_cb (TpProxy *proxy,
    GHashTable *properties,
    const GError *error,
    gpointer user_data G_GNUC_UNUSED,
    GObject *chat)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (chat);

  if (error)
    {
      DEBUG ("Error fetching room config: %s", error->message);
      return;
    }

  update_title (self, properties);
}

static void
tp_chat_dbus_properties_changed_cb (TpProxy *proxy,
    const gchar *interface_name,
    GHashTable *changed,
    const gchar **invalidated,
    gpointer user_data,
    GObject *chat)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (chat);

  if (!tp_strdiff (interface_name, TP_IFACE_CHANNEL_INTERFACE_SUBJECT))
    update_subject (self, changed);

  if (!tp_strdiff (interface_name, TP_IFACE_CHANNEL_INTERFACE_ROOM_CONFIG))
    update_title (self, changed);
}

void
empathy_tp_chat_set_subject (EmpathyTpChat *self,
    const gchar *subject)
{
  tp_cli_channel_interface_subject_call_set_subject (TP_CHANNEL (self), -1,
      subject, tp_chat_async_cb, "while setting subject", NULL,
      G_OBJECT (self));
}

const gchar *
empathy_tp_chat_get_title (EmpathyTpChat *self)
{
  return self->priv->title;
}

gboolean
empathy_tp_chat_supports_subject (EmpathyTpChat *self)
{
  return self->priv->supports_subject;
}

gboolean
empathy_tp_chat_can_set_subject (EmpathyTpChat *self)
{
  return self->priv->can_set_subject;
}

const gchar *
empathy_tp_chat_get_subject (EmpathyTpChat *self)
{
  return self->priv->subject;
}

const gchar *
empathy_tp_chat_get_subject_actor (EmpathyTpChat *self)
{
  return self->priv->subject_actor;
}

static void
tp_chat_dispose (GObject *object)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (object);

  tp_clear_object (&self->priv->account);
  tp_clear_object (&self->priv->remote_contact);
  tp_clear_object (&self->priv->user);

  g_queue_foreach (self->priv->messages_queue, (GFunc) g_object_unref, NULL);
  g_queue_clear (self->priv->messages_queue);

  g_queue_foreach (self->priv->pending_messages_queue,
    (GFunc) g_object_unref, NULL);
  g_queue_clear (self->priv->pending_messages_queue);

  tp_clear_object (&self->priv->ready_result);

  if (G_OBJECT_CLASS (empathy_tp_chat_parent_class)->dispose)
    G_OBJECT_CLASS (empathy_tp_chat_parent_class)->dispose (object);
}

static void
tp_chat_finalize (GObject *object)
{
  EmpathyTpChat *self = (EmpathyTpChat *) object;

  DEBUG ("Finalize: %p", object);

  g_queue_free (self->priv->messages_queue);
  g_queue_free (self->priv->pending_messages_queue);
  g_hash_table_unref (self->priv->messages_being_sent);

  g_free (self->priv->title);
  g_free (self->priv->subject);
  g_free (self->priv->subject_actor);

  G_OBJECT_CLASS (empathy_tp_chat_parent_class)->finalize (object);
}

static void
check_almost_ready (EmpathyTpChat *self)
{
  TpChannel *channel = (TpChannel *) self;

  if (self->priv->ready_result == NULL)
    return;

  if (self->priv->user == NULL)
    return;

  /* We need either the members (room) or the remote contact (private chat).
   * If the chat is protected by a password we can't get these information so
   * consider the chat as ready so it can be presented to the user. */
  if (!tp_channel_password_needed (channel) && self->priv->members == NULL &&
      self->priv->remote_contact == NULL)
    return;

  g_assert (tp_proxy_is_prepared (self,
    TP_TEXT_CHANNEL_FEATURE_INCOMING_MESSAGES));

  tp_g_signal_connect_object (self, "message-received",
    G_CALLBACK (message_received_cb), self, 0);
  tp_g_signal_connect_object (self, "pending-message-removed",
    G_CALLBACK (pending_message_removed_cb), self, 0);

  list_pending_messages (self);

  tp_g_signal_connect_object (self, "message-sent",
    G_CALLBACK (message_sent_cb), self, 0);

  tp_g_signal_connect_object (self, "chat-state-changed",
    G_CALLBACK (tp_chat_state_changed_cb), self, 0);

  check_ready (self);
}

static void
tp_chat_got_added_contacts_cb (TpConnection *connection,
    guint n_contacts,
    EmpathyContact * const * contacts,
    guint n_failed,
    const TpHandle *failed,
    const GError *error,
    gpointer user_data,
    GObject *chat)
{
  EmpathyTpChat *self = (EmpathyTpChat *) chat;
  guint i;
  const TpIntSet *members;
  TpHandle handle;
  EmpathyContact *contact;

  if (error)
    {
      DEBUG ("Error: %s", error->message);
      return;
    }

  members = tp_channel_group_get_members ((TpChannel *) self);
  for (i = 0; i < n_contacts; i++)
    {
      contact = contacts[i];
      handle = empathy_contact_get_handle (contact);

      /* Make sure the contact is still member */
      if (tp_intset_is_member (members, handle))
        {
          self->priv->members = g_list_prepend (self->priv->members,
            g_object_ref (contact));
          g_signal_emit_by_name (chat, "members-changed",
                     contact, NULL, 0, NULL, TRUE);
        }
    }

  check_almost_ready (EMPATHY_TP_CHAT (chat));
}

static EmpathyContact *
chat_lookup_contact (EmpathyTpChat *self,
    TpHandle handle,
    gboolean remove_)
{
  GList *l;

  for (l = self->priv->members; l; l = l->next)
    {
      EmpathyContact *c = l->data;

      if (empathy_contact_get_handle (c) != handle)
        continue;

      if (remove_)
        {
          /* Caller takes the reference. */
          self->priv->members = g_list_delete_link (self->priv->members, l);
        }
      else
        {
          g_object_ref (c);
        }

      return c;
    }

  return NULL;
}

typedef struct
{
  TpHandle old_handle;
  guint reason;
  gchar *message;
} ContactRenameData;

static ContactRenameData *
contact_rename_data_new (TpHandle handle,
    guint reason,
    const gchar* message)
{
  ContactRenameData *data = g_new (ContactRenameData, 1);
  data->old_handle = handle;
  data->reason = reason;
  data->message = g_strdup (message);

  return data;
}

static void
contact_rename_data_free (ContactRenameData* data)
{
  g_free (data->message);
  g_free (data);
}

static void
tp_chat_got_renamed_contacts_cb (TpConnection *connection,
    guint n_contacts,
    EmpathyContact * const * contacts,
    guint n_failed,
    const TpHandle *failed,
    const GError *error,
    gpointer user_data,
    GObject *chat)
{
  EmpathyTpChat *self = (EmpathyTpChat *) chat;
  const TpIntSet *members;
  TpHandle handle;
  EmpathyContact *old = NULL, *new = NULL;
  ContactRenameData *rename_data = (ContactRenameData *) user_data;

  if (error)
    {
      DEBUG ("Error: %s", error->message);
      return;
    }

  /* renamed members can only be delivered one at a time */
  g_warn_if_fail (n_contacts == 1);

  new = contacts[0];

  members = tp_channel_group_get_members ((TpChannel *) self);
  handle = empathy_contact_get_handle (new);

  old = chat_lookup_contact (self, rename_data->old_handle, TRUE);

  /* Make sure the contact is still member */
  if (tp_intset_is_member (members, handle))
    {
      self->priv->members = g_list_prepend (self->priv->members,
        g_object_ref (new));

      if (old != NULL)
        {
          g_signal_emit_by_name (self, "member-renamed",
                     old, new, rename_data->reason,
                     rename_data->message);
          g_object_unref (old);
        }
    }

  if (self->priv->user == old)
    {
      /* We change our nick */
      tp_clear_object (&self->priv->user);
      self->priv->user = g_object_ref (new);
      g_object_notify (chat, "self-contact");
    }

  check_almost_ready (self);
}


static void
tp_chat_group_members_changed_cb (TpChannel *channel,
    gchar *message,
    GArray *added,
    GArray *removed,
    GArray *local_pending,
    GArray *remote_pending,
    guint actor,
    guint reason,
    EmpathyTpChat *self)
{
  EmpathyContact *contact;
  EmpathyContact *actor_contact = NULL;
  guint i;
  ContactRenameData *rename_data;
  TpHandle old_handle;
  TpConnection *connection = tp_channel_borrow_connection (
    (TpChannel *) self);

  /* Contact renamed */
  if (reason == TP_CHANNEL_GROUP_CHANGE_REASON_RENAMED)
    {
      /* there can only be a single 'added' and a single 'removed' handle */
      if (removed->len != 1 || added->len != 1)
        {
          g_warning ("RENAMED with %u added, %u removed (expected 1, 1)",
            added->len, removed->len);
          return;
        }

      old_handle = g_array_index (removed, guint, 0);

      rename_data = contact_rename_data_new (old_handle, reason, message);
      empathy_tp_contact_factory_get_from_handles (connection,
        added->len, (TpHandle *) added->data,
        tp_chat_got_renamed_contacts_cb,
        rename_data, (GDestroyNotify) contact_rename_data_free,
        G_OBJECT (self));
      return;
    }

  if (actor != 0)
    {
      actor_contact = chat_lookup_contact (self, actor, FALSE);
      if (actor_contact == NULL)
        {
          /* FIXME: handle this a tad more gracefully: perhaps
           * the actor was a server op. We could use the
           * contact-ids detail of MembersChangedDetailed.
           */
          DEBUG ("actor %u not a channel member", actor);
        }
    }

  /* Remove contacts that are not members anymore */
  for (i = 0; i < removed->len; i++)
    {
      contact = chat_lookup_contact (self,
        g_array_index (removed, TpHandle, i), TRUE);

      if (contact != NULL)
        {
          g_signal_emit_by_name (self, "members-changed", contact,
                     actor_contact, reason, message,
                     FALSE);
          g_object_unref (contact);
        }
    }

  /* Request added contacts */
  if (added->len > 0)
    {
      empathy_tp_contact_factory_get_from_handles (connection,
        added->len, (TpHandle *) added->data,
        tp_chat_got_added_contacts_cb, NULL, NULL,
        G_OBJECT (self));
    }

  if (actor_contact != NULL)
    g_object_unref (actor_contact);
}

static void
tp_chat_got_remote_contact_cb (TpConnection *connection,
    EmpathyContact *contact,
    const GError *error,
    gpointer user_data,
    GObject *chat)
{
  EmpathyTpChat *self = (EmpathyTpChat *) chat;

  if (error != NULL)
    {
      DEBUG ("Error: %s", error->message);
      empathy_tp_chat_leave (self, "");
      return;
    }

  self->priv->remote_contact = g_object_ref (contact);
  g_object_notify (chat, "remote-contact");

  check_almost_ready (self);
}

static void
tp_chat_got_self_contact_cb (TpConnection *connection,
    EmpathyContact *contact,
    const GError *error,
    gpointer user_data,
    GObject *chat)
{
  EmpathyTpChat *self = (EmpathyTpChat *) chat;

  if (error != NULL)
    {
      DEBUG ("Error: %s", error->message);
      empathy_tp_chat_leave (self, "");
      return;
    }

  self->priv->user = g_object_ref (contact);
  empathy_contact_set_is_user (self->priv->user, TRUE);
  g_object_notify (chat, "self-contact");
  check_almost_ready (self);
}

static void
tp_chat_get_property (GObject *object,
    guint param_id,
    GValue *value,
    GParamSpec *pspec)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (object);

  switch (param_id)
    {
      case PROP_ACCOUNT:
        g_value_set_object (value, self->priv->account);
        break;
      case PROP_SELF_CONTACT:
        g_value_set_object (value, self->priv->user);
        break;
      case PROP_REMOTE_CONTACT:
        g_value_set_object (value, self->priv->remote_contact);
        break;
      case PROP_N_MESSAGES_SENDING:
        g_value_set_uint (value,
          g_hash_table_size (self->priv->messages_being_sent));
        break;
      case PROP_TITLE:
        g_value_set_string (value,
          empathy_tp_chat_get_title (self));
        break;
      case PROP_SUBJECT:
        g_value_set_string (value,
          empathy_tp_chat_get_subject (self));
        break;
      default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    };
}

static void
tp_chat_set_property (GObject *object,
    guint param_id,
    const GValue *value,
    GParamSpec   *pspec)
{
  EmpathyTpChat *self = EMPATHY_TP_CHAT (object);

  switch (param_id)
    {
      case PROP_ACCOUNT:
        self->priv->account = g_value_dup_object (value);
        break;
      default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    };
}

enum {
  FEAT_READY,
  N_FEAT
};

static const TpProxyFeature *
tp_chat_list_features (TpProxyClass *cls G_GNUC_UNUSED)
{
  static TpProxyFeature features[N_FEAT + 1] = { { 0 } };
  static GQuark need[2] = {0, 0};

  if (G_LIKELY (features[0].name != 0))
    return features;

  features[FEAT_READY].name = EMPATHY_TP_CHAT_FEATURE_READY;
  need[0] = TP_TEXT_CHANNEL_FEATURE_INCOMING_MESSAGES;
  features[FEAT_READY].depends_on = need;
  features[FEAT_READY].prepare_async =
    tp_chat_prepare_ready_async;

  /* assert that the terminator at the end is there */
  g_assert (features[N_FEAT].name == 0);

  return features;
}

static void
empathy_tp_chat_class_init (EmpathyTpChatClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  TpProxyClass *proxy_class = TP_PROXY_CLASS (klass);

  object_class->dispose = tp_chat_dispose;
  object_class->finalize = tp_chat_finalize;
  object_class->get_property = tp_chat_get_property;
  object_class->set_property = tp_chat_set_property;

  proxy_class->list_features = tp_chat_list_features;

  g_object_class_install_property (object_class, PROP_ACCOUNT,
      g_param_spec_object ("account", "TpAccount",
        "the account associated with the chat",
        TP_TYPE_ACCOUNT,
        G_PARAM_READWRITE |
        G_PARAM_CONSTRUCT_ONLY |
        G_PARAM_STATIC_STRINGS));

  /**
   * EmpathyTpChat:self-contact:
   *
   * Not to be confused with TpChannel:group-self-contact.
   */
  g_object_class_install_property (object_class, PROP_SELF_CONTACT,
      g_param_spec_object ("self-contact", "The local contact",
        "The EmpathyContact for the local user on this channel",
        EMPATHY_TYPE_CONTACT,
        G_PARAM_READABLE));

  g_object_class_install_property (object_class, PROP_REMOTE_CONTACT,
      g_param_spec_object ("remote-contact", "The remote contact",
        "The remote contact if there is no group iface on the channel",
        EMPATHY_TYPE_CONTACT,
        G_PARAM_READABLE));

  g_object_class_install_property (object_class, PROP_N_MESSAGES_SENDING,
      g_param_spec_uint ("n-messages-sending", "Num Messages Sending",
        "The number of messages being sent",
        0, G_MAXUINT, 0,
        G_PARAM_READABLE));

  g_object_class_install_property (object_class, PROP_TITLE,
      g_param_spec_string ("title", "Title",
        "A human-readable name for the room, if any",
        NULL,
        G_PARAM_READABLE |
        G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (object_class, PROP_SUBJECT,
      g_param_spec_string ("subject", "Subject",
        "The room's current subject, if any",
        NULL,
        G_PARAM_READABLE |
        G_PARAM_STATIC_STRINGS));

  /* Signals */
  signals[MESSAGE_RECEIVED] = g_signal_new ("message-received-empathy",
      G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST,
      0,
      NULL, NULL,
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      1, EMPATHY_TYPE_MESSAGE);

  signals[SEND_ERROR] = g_signal_new ("send-error",
      G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST,
      0,
      NULL, NULL,
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      3, G_TYPE_STRING, G_TYPE_UINT, G_TYPE_STRING);

  signals[CHAT_STATE_CHANGED] = g_signal_new ("chat-state-changed-empathy",
      G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST,
      0,
      NULL, NULL,
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      2, EMPATHY_TYPE_CONTACT, G_TYPE_UINT);

  signals[MESSAGE_ACKNOWLEDGED] = g_signal_new ("message-acknowledged",
      G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST,
      0,
      NULL, NULL,
      g_cclosure_marshal_generic,
      G_TYPE_NONE,
      1, EMPATHY_TYPE_MESSAGE);

  g_type_class_add_private (object_class, sizeof (EmpathyTpChatPrivate));
}

static void
empathy_tp_chat_init (EmpathyTpChat *self)
{
  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, EMPATHY_TYPE_TP_CHAT,
      EmpathyTpChatPrivate);

  self->priv->messages_queue = g_queue_new ();
  self->priv->pending_messages_queue = g_queue_new ();
  self->priv->messages_being_sent = g_hash_table_new_full (
      g_str_hash, g_str_equal, g_free, NULL);
}

static void
tp_chat_iface_init (EmpathyContactListIface *iface)
{
  iface->get_members = tp_chat_get_members;
}

EmpathyTpChat *
empathy_tp_chat_new (TpSimpleClientFactory *factory,
    TpAccount *account,
    TpConnection *conn,
    const gchar *object_path,
    const GHashTable *immutable_properties)
{
  TpProxy *conn_proxy = (TpProxy *) conn;

  g_return_val_if_fail (TP_IS_ACCOUNT (account), NULL);
  g_return_val_if_fail (TP_IS_CONNECTION (conn), NULL);
  g_return_val_if_fail (immutable_properties != NULL, NULL);

  return g_object_new (EMPATHY_TYPE_TP_CHAT,
      "factory", factory,
       "account", account,
       "connection", conn,
       "dbus-daemon", conn_proxy->dbus_daemon,
       "bus-name", conn_proxy->bus_name,
       "object-path", object_path,
       "channel-properties", immutable_properties,
       NULL);
}

const gchar *
empathy_tp_chat_get_id (EmpathyTpChat *self)
{
  const gchar *id;

  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), NULL);

  id = tp_channel_get_identifier ((TpChannel *) self);
  if (!EMP_STR_EMPTY (id))
    return id;
  else if (self->priv->remote_contact)
    return empathy_contact_get_id (self->priv->remote_contact);
  else
    return NULL;

}

EmpathyContact *
empathy_tp_chat_get_remote_contact (EmpathyTpChat *self)
{
  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), NULL);

  return self->priv->remote_contact;
}

TpAccount *
empathy_tp_chat_get_account (EmpathyTpChat *self)
{
  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), NULL);

  return self->priv->account;
}

void
empathy_tp_chat_send (EmpathyTpChat *self,
          TpMessage *message)
{
  gchar *message_body;

  g_return_if_fail (EMPATHY_IS_TP_CHAT (self));
  g_return_if_fail (TP_IS_CLIENT_MESSAGE (message));

  message_body = tp_message_to_text (message, NULL);

  DEBUG ("Sending message: %s", message_body);

  tp_text_channel_send_message_async (TP_TEXT_CHANNEL (self),
    message, TP_MESSAGE_SENDING_FLAG_REPORT_DELIVERY,
    message_send_cb, self);

  g_free (message_body);
}

const GList *
empathy_tp_chat_get_pending_messages (EmpathyTpChat *self)
{
  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), NULL);

  return self->priv->pending_messages_queue->head;
}

void
empathy_tp_chat_acknowledge_message (EmpathyTpChat *self,
    EmpathyMessage *message)
{
  TpMessage *tp_msg;

  g_return_if_fail (EMPATHY_IS_TP_CHAT (self));

  if (!empathy_message_is_incoming (message))
    return;

  tp_msg = empathy_message_get_tp_message (message);
  tp_text_channel_ack_message_async (TP_TEXT_CHANNEL (self),
             tp_msg, NULL, NULL);
}

/**
 * empathy_tp_chat_can_add_contact:
 *
 * Returns: %TRUE if empathy_contact_list_add() will work for this channel.
 * That is if this chat is a 1-to-1 channel that can be upgraded to
 * a MUC using the Conference interface or if the channel is a MUC.
 */
gboolean
empathy_tp_chat_can_add_contact (EmpathyTpChat *self)
{
  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), FALSE);

  return self->priv->can_upgrade_to_muc ||
    tp_proxy_has_interface_by_id (self,
      TP_IFACE_QUARK_CHANNEL_INTERFACE_GROUP);;
}

static void
tp_channel_leave_async_cb (GObject *source_object,
        GAsyncResult *res,
        gpointer user_data)
{
  GError *error = NULL;

  if (!tp_channel_leave_finish (TP_CHANNEL (source_object), res, &error))
    {
      DEBUG ("Could not leave channel properly: (%s); closing the channel",
        error->message);
      g_error_free (error);
    }
}

void
empathy_tp_chat_leave (EmpathyTpChat *self,
    const gchar *message)
{
  TpChannel *channel = (TpChannel *) self;

  DEBUG ("Leaving channel %s with message \"%s\"",
    tp_channel_get_identifier (channel), message);

  tp_channel_leave_async (channel, TP_CHANNEL_GROUP_CHANGE_REASON_NONE,
    message, tp_channel_leave_async_cb, self);
}

static void
add_members_cb (TpChannel *proxy,
    const GError *error,
    gpointer user_data,
    GObject *weak_object)
{
  EmpathyTpChat *self = (EmpathyTpChat *) weak_object;

  if (error != NULL)
    {
      DEBUG ("Failed to join chat (%s): %s",
        tp_channel_get_identifier ((TpChannel *) self), error->message);
    }
}

void
empathy_tp_chat_join (EmpathyTpChat *self)
{
  TpHandle self_handle;
  GArray *members;

  self_handle = tp_channel_group_get_self_handle ((TpChannel *) self);

  members = g_array_sized_new (FALSE, FALSE, sizeof (TpHandle), 1);
  g_array_append_val (members, self_handle);

  tp_cli_channel_interface_group_call_add_members ((TpChannel *) self, -1,
      members, "", add_members_cb, NULL, NULL, G_OBJECT (self));

  g_array_unref (members);
}

gboolean
empathy_tp_chat_is_invited (EmpathyTpChat *self,
    TpHandle *inviter)
{
  TpHandle self_handle;

  if (!tp_proxy_has_interface (self, TP_IFACE_CHANNEL_INTERFACE_GROUP))
    return FALSE;

  self_handle = tp_channel_group_get_self_handle ((TpChannel *) self);
  if (self_handle == 0)
    return FALSE;

  return tp_channel_group_get_local_pending_info ((TpChannel *) self,
      self_handle, inviter, NULL, NULL);
}

TpChannelChatState
empathy_tp_chat_get_chat_state (EmpathyTpChat *self,
    EmpathyContact *contact)
{
  return tp_channel_get_chat_state ((TpChannel *) self,
    empathy_contact_get_handle (contact));
}

EmpathyContact *
empathy_tp_chat_get_self_contact (EmpathyTpChat *self)
{
  g_return_val_if_fail (EMPATHY_IS_TP_CHAT (self), NULL);

  return self->priv->user;
}

GQuark
empathy_tp_chat_get_feature_ready (void)
{
  return g_quark_from_static_string ("empathy-tp-chat-feature-ready");
}

static void
tp_chat_prepare_ready_async (TpProxy *proxy,
  const TpProxyFeature *feature,
  GAsyncReadyCallback callback,
  gpointer user_data)
{
  EmpathyTpChat *self = (EmpathyTpChat *) proxy;
  TpChannel *channel = (TpChannel *) proxy;
  TpConnection *connection;
  gboolean listen_for_dbus_properties_changed = FALSE;

  g_assert (self->priv->ready_result == NULL);
  self->priv->ready_result = g_simple_async_result_new (G_OBJECT (self),
    callback, user_data, tp_chat_prepare_ready_async);

  connection = tp_channel_borrow_connection (channel);

  if (tp_proxy_has_interface_by_id (self,
            TP_IFACE_QUARK_CHANNEL_INTERFACE_GROUP))
    {
      const TpIntSet *members;
      GArray *handles;
      TpHandle handle;

      /* Get self contact from the group's self handle */
      handle = tp_channel_group_get_self_handle (channel);
      empathy_tp_contact_factory_get_from_handle (connection,
        handle, tp_chat_got_self_contact_cb,
        NULL, NULL, G_OBJECT (self));

      /* Get initial member contacts */
      members = tp_channel_group_get_members (channel);
      handles = tp_intset_to_array (members);
      empathy_tp_contact_factory_get_from_handles (connection,
        handles->len, (TpHandle *) handles->data,
        tp_chat_got_added_contacts_cb, NULL, NULL, G_OBJECT (self));

      self->priv->can_upgrade_to_muc = FALSE;

      tp_g_signal_connect_object (self, "group-members-changed",
        G_CALLBACK (tp_chat_group_members_changed_cb), self, 0);
    }
  else
    {
      TpCapabilities *caps;
      GPtrArray *classes;
      guint i;
      TpHandle handle;

      /* Get the self contact from the connection's self handle */
      handle = tp_connection_get_self_handle (connection);
      empathy_tp_contact_factory_get_from_handle (connection,
        handle, tp_chat_got_self_contact_cb,
        NULL, NULL, G_OBJECT (self));

      /* Get the remote contact */
      handle = tp_channel_get_handle (channel, NULL);
      empathy_tp_contact_factory_get_from_handle (connection,
        handle, tp_chat_got_remote_contact_cb,
        NULL, NULL, G_OBJECT (self));

      caps = tp_connection_get_capabilities (connection);
      g_assert (caps != NULL);

      classes = tp_capabilities_get_channel_classes (caps);

      for (i = 0; i < classes->len; i++)
        {
          GValueArray *array = g_ptr_array_index (classes, i);
          const char **oprops = g_value_get_boxed (
            g_value_array_get_nth (array, 1));

          if (tp_strv_contains (oprops,
                TP_PROP_CHANNEL_INTERFACE_CONFERENCE_INITIAL_CHANNELS))
            {
              self->priv->can_upgrade_to_muc = TRUE;
              break;
            }
        }
    }

  if (tp_proxy_has_interface_by_id (self,
            TP_IFACE_QUARK_CHANNEL_INTERFACE_SUBJECT))
    {
      tp_cli_dbus_properties_call_get_all (channel, -1,
                   TP_IFACE_CHANNEL_INTERFACE_SUBJECT,
                   tp_chat_get_all_subject_cb,
                   NULL, NULL,
                   G_OBJECT (self));
      listen_for_dbus_properties_changed = TRUE;
    }

  if (tp_proxy_has_interface_by_id (self,
            TP_IFACE_QUARK_CHANNEL_INTERFACE_ROOM_CONFIG))
    {
      tp_cli_dbus_properties_call_get_all (channel, -1,
                   TP_IFACE_CHANNEL_INTERFACE_ROOM_CONFIG,
                   tp_chat_get_all_room_config_cb,
                   NULL, NULL,
                   G_OBJECT (self));
      listen_for_dbus_properties_changed = TRUE;
    }

  if (listen_for_dbus_properties_changed)
    {
      tp_cli_dbus_properties_connect_to_properties_changed (channel,
                        tp_chat_dbus_properties_changed_cb,
                        NULL, NULL,
                        G_OBJECT (self), NULL);
    }
}