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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2007-2008 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-marshal.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;
    gboolean               had_properties_list;
    GPtrArray             *properties;
    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_REMOTE_CONTACT,
    PROP_N_MESSAGES_SENDING,
};

enum {
    MESSAGE_RECEIVED,
    SEND_ERROR,
    CHAT_STATE_CHANGED,
    PROPERTY_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) {
        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);
    }
}

static void
tp_chat_add (EmpathyContactList *list,
         EmpathyContact     *contact,
         const gchar        *message)
{
    EmpathyTpChat *self = (EmpathyTpChat *) list;
    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_TP_CHAT (list));
        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 void
tp_chat_remove (EmpathyContactList *list,
        EmpathyContact     *contact,
        const gchar        *message)
{
    EmpathyTpChat *self = (EmpathyTpChat *) list;
    TpHandle           handle;
    GArray             handles = {(gchar *) &handle, 1};

    g_return_if_fail (EMPATHY_IS_TP_CHAT (list));
    g_return_if_fail (EMPATHY_IS_CONTACT (contact));

    handle = empathy_contact_get_handle (contact);
    tp_cli_channel_interface_group_call_remove_members ((TpChannel *) self, -1,
                                &handles, NULL,
                                NULL, NULL, NULL,
                                NULL);
}

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) {
        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) {
        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
tp_chat_property_flags_changed_cb (TpProxy         *proxy,
                   const GPtrArray *properties,
                   gpointer         user_data,
                   GObject         *chat)
{
    EmpathyTpChat *self = (EmpathyTpChat *) chat;
    guint              i, j;

    if (!self->priv->had_properties_list || !properties) {
        return;
    }

    for (i = 0; i < properties->len; i++) {
        GValueArray           *prop_struct;
        EmpathyTpChatProperty *property;
        guint                  id;
        guint                  flags;

        prop_struct = g_ptr_array_index (properties, i);
        id = g_value_get_uint (g_value_array_get_nth (prop_struct, 0));
        flags = g_value_get_uint (g_value_array_get_nth (prop_struct, 1));

        for (j = 0; j < self->priv->properties->len; j++) {
            property = g_ptr_array_index (self->priv->properties, j);
            if (property->id == id) {
                property->flags = flags;
                DEBUG ("property %s flags changed: %d",
                    property->name, property->flags);
                break;
            }
        }
    }
}

static void
tp_chat_properties_changed_cb (TpProxy         *proxy,
                   const GPtrArray *properties,
                   gpointer         user_data,
                   GObject         *chat)
{
    EmpathyTpChat *self = (EmpathyTpChat *) chat;
    guint              i, j;

    if (!self->priv->had_properties_list || !properties) {
        return;
    }

    for (i = 0; i < properties->len; i++) {
        GValueArray           *prop_struct;
        EmpathyTpChatProperty *property;
        guint                  id;
        GValue                *src_value;

        prop_struct = g_ptr_array_index (properties, i);
        id = g_value_get_uint (g_value_array_get_nth (prop_struct, 0));
        src_value = g_value_get_boxed (g_value_array_get_nth (prop_struct, 1));

        for (j = 0; j < self->priv->properties->len; j++) {
            property = g_ptr_array_index (self->priv->properties, j);
            if (property->id == id) {
                if (property->value) {
                    g_value_copy (src_value, property->value);
                } else {
                    property->value = tp_g_value_slice_dup (src_value);
                }

                DEBUG ("property %s changed", property->name);
                g_signal_emit (chat, signals[PROPERTY_CHANGED], 0,
                           property->name, property->value);
                break;
            }
        }
    }
}

static void
tp_chat_get_properties_cb (TpProxy         *proxy,
               const GPtrArray *properties,
               const GError    *error,
               gpointer         user_data,
               GObject         *chat)
{
    if (error) {
        DEBUG ("Error getting properties: %s", error->message);
        return;
    }

    tp_chat_properties_changed_cb (proxy, properties, user_data, chat);
}

static void
tp_chat_list_properties_cb (TpProxy         *proxy,
                const GPtrArray *properties,
                const GError    *error,
                gpointer         user_data,
                GObject         *chat)
{
    EmpathyTpChat *self = (EmpathyTpChat *) chat;
    GArray            *ids;
    guint              i;

    self->priv->had_properties_list = TRUE;

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

    ids = g_array_sized_new (FALSE, FALSE, sizeof (guint), properties->len);
    self->priv->properties = g_ptr_array_sized_new (properties->len);
    for (i = 0; i < properties->len; i++) {
        GValueArray           *prop_struct;
        EmpathyTpChatProperty *property;

        prop_struct = g_ptr_array_index (properties, i);
        property = g_slice_new0 (EmpathyTpChatProperty);
        property->id = g_value_get_uint (g_value_array_get_nth (prop_struct, 0));
        property->name = g_value_dup_string (g_value_array_get_nth (prop_struct, 1));
        property->flags = g_value_get_uint (g_value_array_get_nth (prop_struct, 3));

        DEBUG ("Adding property name=%s id=%d flags=%d",
            property->name, property->id, property->flags);
        g_ptr_array_add (self->priv->properties, property);
        if (property->flags & TP_PROPERTY_FLAG_READ) {
            g_array_append_val (ids, property->id);
        }
    }

    tp_cli_properties_interface_call_get_properties (proxy, -1,
                             ids,
                             tp_chat_get_properties_cb,
                             NULL, NULL,
                             chat);

    g_array_free (ids, TRUE);
}

void
empathy_tp_chat_set_property (EmpathyTpChat *self,
                  const gchar   *name,
                  const GValue  *value)
{
    EmpathyTpChatProperty *property;
    guint                  i;

    if (!self->priv->had_properties_list) {
        return;
    }

    for (i = 0; i < self->priv->properties->len; i++) {
        property = g_ptr_array_index (self->priv->properties, i);
        if (!tp_strdiff (property->name, name)) {
            GPtrArray   *properties;
            GValueArray *prop;
            GValue       id = {0, };
            GValue       dest_value = {0, };

            if (!(property->flags & TP_PROPERTY_FLAG_WRITE)) {
                break;
            }

            g_value_init (&id, G_TYPE_UINT);
            g_value_init (&dest_value, G_TYPE_VALUE);
            g_value_set_uint (&id, property->id);
            g_value_set_boxed (&dest_value, value);

            prop = g_value_array_new (2);
            g_value_array_append (prop, &id);
            g_value_array_append (prop, &dest_value);

            properties = g_ptr_array_sized_new (1);
            g_ptr_array_add (properties, prop);

            DEBUG ("Set property %s", name);
            tp_cli_properties_interface_call_set_properties (self, -1,
                                     properties,
                                     (tp_cli_properties_interface_callback_for_set_properties)
                                     tp_chat_async_cb,
                                     "Seting property", NULL,
                                     G_OBJECT (self));

            g_ptr_array_free (properties, TRUE);
            g_value_array_free (prop);

            break;
        }
    }
}

EmpathyTpChatProperty *
empathy_tp_chat_get_property (EmpathyTpChat *self,
                  const gchar   *name)
{
    EmpathyTpChatProperty *property;
    guint                  i;

    if (!self->priv->had_properties_list) {
        return NULL;
    }

    for (i = 0; i < self->priv->properties->len; i++) {
        property = g_ptr_array_index (self->priv->properties, i);
        if (!tp_strdiff (property->name, name)) {
            return property;
        }
    }

    return NULL;
}

GPtrArray *
empathy_tp_chat_get_properties (EmpathyTpChat *self)
{
    return self->priv->properties;
}

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;
    guint              i;

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

    if (self->priv->properties) {
        for (i = 0; i < self->priv->properties->len; i++) {
            EmpathyTpChatProperty *property;

            property = g_ptr_array_index (self->priv->properties, i);
            g_free (property->name);
            if (property->value) {
                tp_g_value_slice_free (property->value);
            }
            g_slice_free (EmpathyTpChatProperty, property);
        }
        g_ptr_array_free (self->priv->properties, TRUE);
    }

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

    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_update_remote_contact (EmpathyTpChat *self)
{
    TpChannel *channel = (TpChannel *) self;
    EmpathyContact *contact = NULL;
    TpHandle self_handle;
    TpHandleType handle_type;
    GList *l;

    /* If this is a named chatroom, never pretend it is a private chat */
    tp_channel_get_handle (channel, &handle_type);
    if (handle_type == TP_HANDLE_TYPE_ROOM) {
        return;
    }

    /* This is an MSN chat, but it's the new style where 1-1 chats don't
     * have the group interface. If it has the conference interface, then
     * it is indeed a MUC. */
    if (tp_proxy_has_interface_by_id (self,
                      TP_IFACE_QUARK_CHANNEL_INTERFACE_CONFERENCE)) {
        return;
    }

    /* This is an MSN-like chat where anyone can join the chat at anytime.
     * If there is only one non-self contact member, we are in a private
     * chat and we set the "remote-contact" property to that contact. If
     * there are more, set the "remote-contact" property to NULL and the
     * UI will display a contact list. */
    self_handle = tp_channel_group_get_self_handle (channel);
    for (l = self->priv->members; l; l = l->next) {
        /* Skip self contact if member */
        if (empathy_contact_get_handle (l->data) == self_handle) {
            continue;
        }

        /* We have more than one remote contact, break */
        if (contact != NULL) {
            contact = NULL;
            break;
        }

        /* If we didn't find yet a remote contact, keep this one */
        contact = l->data;
    }

    if (self->priv->remote_contact == contact) {
        return;
    }

    DEBUG ("Changing remote contact from %p to %p",
        self->priv->remote_contact, contact);

    if (self->priv->remote_contact) {
        g_object_unref (self->priv->remote_contact);
    }

    self->priv->remote_contact = contact ? g_object_ref (contact) : NULL;
    g_object_notify (G_OBJECT (self), "remote-contact");
}

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);
        }
    }

    tp_chat_update_remote_contact (EMPATHY_TP_CHAT (chat));
    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);
    }

    tp_chat_update_remote_contact (self);
    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));
    }

    tp_chat_update_remote_contact (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) {
        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) {
        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);
    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_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;
    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));

    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));

    /* 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_VOID__OBJECT,
                  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,
                  _empathy_marshal_VOID__STRING_UINT_STRING,
                  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,
                  _empathy_marshal_VOID__OBJECT_UINT,
                  G_TYPE_NONE,
                  2, EMPATHY_TYPE_CONTACT, G_TYPE_UINT);

    signals[PROPERTY_CHANGED] =
        g_signal_new ("property-changed",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  _empathy_marshal_VOID__STRING_BOXED,
                  G_TYPE_NONE,
                  2, G_TYPE_STRING, G_TYPE_VALUE);

    signals[MESSAGE_ACKNOWLEDGED] =
        g_signal_new ("message-acknowledged",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  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->add         = tp_chat_add;
    iface->remove      = tp_chat_remove;
    iface->get_members = tp_chat_get_members;
}

EmpathyTpChat *
empathy_tp_chat_new (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,
                 "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);
}

void
empathy_tp_chat_acknowledge_messages (EmpathyTpChat *self,
                      const GSList *messages) {
    const GSList *l;
    GList *messages_to_ack = NULL;

    g_return_if_fail (EMPATHY_IS_TP_CHAT (self));

    if (messages == NULL)
        return;

    for (l = messages; l != NULL; l = g_slist_next (l)) {
        EmpathyMessage *message = EMPATHY_MESSAGE (l->data);

        if (empathy_message_is_incoming (message)) {
            TpMessage *tp_msg = empathy_message_get_tp_message (message);
            messages_to_ack = g_list_append (messages_to_ack, tp_msg);
        }
    }

    if (messages_to_ack != NULL) {
        tp_text_channel_ack_messages_async (TP_TEXT_CHANNEL (self),
                            messages_to_ack, NULL, NULL);
    }

    g_list_free (messages_to_ack);
}

void
empathy_tp_chat_acknowledge_all_messages (EmpathyTpChat *self)
{
  empathy_tp_chat_acknowledge_messages (self,
    (GSList *) empathy_tp_chat_get_pending_messages (self));
}

/**
 * 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_free (members, TRUE);
}

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
conn_prepared_cb (GObject *source,
    GAsyncResult *result,
    gpointer user_data)
{
    EmpathyTpChat *self = user_data;
    TpChannel *channel = (TpChannel *) self;
    GError *error = NULL;
    TpHandle handle;
    TpConnection *connection = (TpConnection *) source;

    if (!tp_proxy_prepare_finish (source, result, &error)) {
        g_simple_async_result_set_from_error (self->priv->ready_result, error);
        g_error_free (error);
        g_simple_async_result_complete (self->priv->ready_result);
        tp_clear_object (&self->priv->ready_result);
        return;
    }

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

        /* 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;

        /* 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_PROPERTIES_INTERFACE)) {
        tp_cli_properties_interface_call_list_properties (channel, -1,
                                  tp_chat_list_properties_cb,
                                  NULL, NULL,
                                  G_OBJECT (self));
        tp_cli_properties_interface_connect_to_properties_changed (channel,
                                       tp_chat_properties_changed_cb,
                                       NULL, NULL,
                                       G_OBJECT (self), NULL);
        tp_cli_properties_interface_connect_to_property_flags_changed (channel,
                                           tp_chat_property_flags_changed_cb,
                                           NULL, NULL,
                                           G_OBJECT (self), NULL);
    }
}

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;
    GQuark conn_features[] = { TP_CONNECTION_FEATURE_CAPABILITIES, 0 };

    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);

    tp_proxy_prepare_async (connection, conn_features,
        conn_prepared_cb, self);
}