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/channel.h>
#include <telepathy-glib/dbus.h>
#include <telepathy-glib/util.h>

#include "empathy-tp-chat.h"
#include "empathy-tp-contact-factory.h"
#include "empathy-contact-monitor.h"
#include "empathy-contact-list.h"
#include "empathy-marshal.h"
#include "empathy-time.h"
#include "empathy-utils.h"

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

#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyTpChat)
typedef struct {
    gboolean               dispose_has_run;
    EmpathyTpContactFactory *factory;
    EmpathyContactMonitor *contact_monitor;
    EmpathyContact        *user;
    EmpathyContact        *remote_contact;
    GList                 *members;
    TpChannel             *channel;
    gboolean               listing_pending_messages;
    /* 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               ready;
} EmpathyTpChatPriv;

typedef struct {
    gchar          *name;
    guint           id;
    TpPropertyFlags flags;
    GValue         *value;
} TpChatProperty;

static void tp_chat_iface_init         (EmpathyContactListIface *iface);

enum {
    PROP_0,
    PROP_CHANNEL,
    PROP_REMOTE_CONTACT,
    PROP_READY,
};

enum {
    MESSAGE_RECEIVED,
    SEND_ERROR,
    CHAT_STATE_CHANGED,
    PROPERTY_CHANGED,
    DESTROY,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];

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

static void acknowledge_messages (EmpathyTpChat *chat, GArray *ids);

static void
tp_chat_invalidated_cb (TpProxy       *proxy,
            guint          domain,
            gint           code,
            gchar         *message,
            EmpathyTpChat *chat)
{
    DEBUG ("Channel invalidated: %s", message);
    g_signal_emit (chat, signals[DESTROY], 0);
}

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
tp_chat_add (EmpathyContactList *list,
         EmpathyContact     *contact,
         const gchar        *message)
{
    EmpathyTpChatPriv *priv = GET_PRIV (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_add_members (priv->channel, -1,
                             &handles, NULL,
                             NULL, NULL, NULL,
                             NULL);
}

static void
tp_chat_remove (EmpathyContactList *list,
        EmpathyContact     *contact,
        const gchar        *message)
{
    EmpathyTpChatPriv *priv = GET_PRIV (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 (priv->channel, -1,
                                &handles, NULL,
                                NULL, NULL, NULL,
                                NULL);
}

static GList *
tp_chat_get_members (EmpathyContactList *list)
{
    EmpathyTpChatPriv *priv = GET_PRIV (list);
    GList             *members = NULL;

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (list), NULL);

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

    return members;
}

static EmpathyContactMonitor *
tp_chat_get_monitor (EmpathyContactList *list)
{
    EmpathyTpChatPriv *priv;

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (list), NULL);

    priv = GET_PRIV (list);

    if (priv->contact_monitor == NULL) {
        priv->contact_monitor = empathy_contact_monitor_new_for_iface (list);
    }

    return priv->contact_monitor;
}

static void
tp_chat_emit_queued_messages (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    EmpathyMessage    *message;

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

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

static void
tp_chat_got_sender_cb (EmpathyTpContactFactory *factory,
               EmpathyContact          *contact,
               const GError            *error,
               gpointer                 message,
               GObject                 *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

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

    tp_chat_emit_queued_messages (EMPATHY_TP_CHAT (chat));
}

static void
tp_chat_build_message (EmpathyTpChat *chat,
               guint          id,
               guint          type,
               guint          timestamp,
               guint          from_handle,
               const gchar   *message_body)
{
    EmpathyTpChatPriv *priv;
    EmpathyMessage    *message;

    priv = GET_PRIV (chat);

    message = empathy_message_new (message_body);
    empathy_message_set_tptype (message, type);
    empathy_message_set_receiver (message, priv->user);
    empathy_message_set_timestamp (message, timestamp);
    empathy_message_set_id (message, id);
    g_queue_push_tail (priv->messages_queue, message);

    if (from_handle == 0) {
        empathy_message_set_sender (message, priv->user);
        tp_chat_emit_queued_messages (chat);
    } else {
        empathy_tp_contact_factory_get_from_handle (priv->factory,
            from_handle,
            tp_chat_got_sender_cb,
            message, NULL, G_OBJECT (chat));
    }
}

static void
tp_chat_received_cb (TpChannel   *channel,
             guint        message_id,
             guint        timestamp,
             guint        from_handle,
             guint        message_type,
             guint        message_flags,
             const gchar *message_body,
             gpointer     user_data,
             GObject     *chat_)
{
    EmpathyTpChat *chat = EMPATHY_TP_CHAT (chat_);
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    if (priv->channel == NULL)
        return;

    if (priv->listing_pending_messages) {
        return;
    }

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

    if (message_flags & TP_CHANNEL_TEXT_MESSAGE_FLAG_NON_TEXT_CONTENT &&
        !tp_strdiff (message_body, "")) {
        GArray *ids;

        DEBUG ("Empty message with NonTextContent, ignoring and acking.");

        ids = g_array_sized_new (FALSE, FALSE, sizeof (guint), 1);
        g_array_append_val (ids, message_id);
        acknowledge_messages (chat, ids);
        g_array_free (ids, TRUE);

        return;
    }

    tp_chat_build_message (chat,
                   message_id,
                   message_type,
                   timestamp,
                   from_handle,
                   message_body);
}

static void
tp_chat_sent_cb (TpChannel   *channel,
         guint        timestamp,
         guint        message_type,
         const gchar *message_body,
         gpointer     user_data,
         GObject     *chat_)
{
    EmpathyTpChat *chat = EMPATHY_TP_CHAT (chat_);
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    if (priv->channel == NULL)
        return;

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

    tp_chat_build_message (chat,
                   0,
                   message_type,
                   timestamp,
                   0,
                   message_body);
}

static void
tp_chat_send_error_cb (TpChannel   *channel,
               guint        error_code,
               guint        timestamp,
               guint        message_type,
               const gchar *message_body,
               gpointer     user_data,
               GObject     *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    if (priv->channel == NULL)
        return;

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

    tp_chat_build_message (EMPATHY_TP_CHAT (chat),
                   0,
                   message_type,
                   timestamp,
                   0,
                   message_body);
}

static void
tp_chat_send_cb (TpChannel    *proxy,
         const GError *error,
         gpointer      user_data,
         GObject      *chat)
{
    EmpathyMessage *message = EMPATHY_MESSAGE (user_data);

    if (error) {
        DEBUG ("Error: %s", error->message);
        g_signal_emit (chat, signals[SEND_ERROR], 0, message,
                   TP_CHANNEL_TEXT_SEND_ERROR_UNKNOWN);
    }
}

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

static void
tp_chat_state_changed_got_contact_cb (EmpathyTpContactFactory *factory,
                      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_name (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,
              gpointer   user_data,
              GObject   *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    empathy_tp_contact_factory_get_from_handle (priv->factory, handle,
        tp_chat_state_changed_got_contact_cb, GUINT_TO_POINTER (state),
        NULL, chat);
}

static void
tp_chat_list_pending_messages_cb (TpChannel       *channel,
                  const GPtrArray *messages_list,
                  const GError    *error,
                  gpointer         user_data,
                  GObject         *chat_)
{
    EmpathyTpChat     *chat = EMPATHY_TP_CHAT (chat_);
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    guint              i;
    GArray            *empty_non_text_content_ids = NULL;

    priv->listing_pending_messages = FALSE;

    if (priv->channel == NULL)
        return;

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

    for (i = 0; i < messages_list->len; i++) {
        GValueArray    *message_struct;
        const gchar    *message_body;
        guint           message_id;
        guint           timestamp;
        guint           from_handle;
        guint           message_type;
        guint           message_flags;

        message_struct = g_ptr_array_index (messages_list, i);

        message_id = g_value_get_uint (g_value_array_get_nth (message_struct, 0));
        timestamp = g_value_get_uint (g_value_array_get_nth (message_struct, 1));
        from_handle = g_value_get_uint (g_value_array_get_nth (message_struct, 2));
        message_type = g_value_get_uint (g_value_array_get_nth (message_struct, 3));
        message_flags = g_value_get_uint (g_value_array_get_nth (message_struct, 4));
        message_body = g_value_get_string (g_value_array_get_nth (message_struct, 5));

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

        if (message_flags & TP_CHANNEL_TEXT_MESSAGE_FLAG_NON_TEXT_CONTENT &&
            !tp_strdiff (message_body, "")) {
            DEBUG ("Empty message with NonTextContent, ignoring and acking.");

            if (empty_non_text_content_ids == NULL) {
                empty_non_text_content_ids = g_array_new (FALSE, FALSE, sizeof (guint));
            }

            g_array_append_val (empty_non_text_content_ids, message_id);
            continue;
        }

        tp_chat_build_message (chat,
                       message_id,
                       message_type,
                       timestamp,
                       from_handle,
                       message_body);
    }

    if (empty_non_text_content_ids != NULL) {
        acknowledge_messages (chat, empty_non_text_content_ids);
        g_array_free (empty_non_text_content_ids, TRUE);
    }
}

static void
tp_chat_property_flags_changed_cb (TpProxy         *proxy,
                   const GPtrArray *properties,
                   gpointer         user_data,
                   GObject         *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    guint              i, j;

    if (priv->channel == NULL)
        return;

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

    for (i = 0; i < properties->len; i++) {
        GValueArray    *prop_struct;
        TpChatProperty *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 < priv->properties->len; j++) {
            property = g_ptr_array_index (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)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    guint              i, j;

    if (priv->channel == NULL)
        return;

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

    for (i = 0; i < properties->len; i++) {
        GValueArray    *prop_struct;
        TpChatProperty *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 < priv->properties->len; j++) {
            property = g_ptr_array_index (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)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    GArray            *ids;
    guint              i;

    if (priv->channel == NULL)
        return;

    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);
    priv->properties = g_ptr_array_sized_new (properties->len);
    for (i = 0; i < properties->len; i++) {
        GValueArray    *prop_struct;
        TpChatProperty *property;

        prop_struct = g_ptr_array_index (properties, i);
        property = g_slice_new0 (TpChatProperty);
        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 (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 *chat,
                  const gchar   *name,
                  const GValue  *value)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    TpChatProperty    *property;
    guint              i;

    for (i = 0; i < priv->properties->len; i++) {
        property = g_ptr_array_index (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 (priv->channel, -1,
                                     properties,
                                     (tp_cli_properties_interface_callback_for_set_properties)
                                     tp_chat_async_cb,
                                     "Seting property", NULL,
                                     G_OBJECT (chat));

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

            break;
        }
    }
}

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

    if (priv->dispose_has_run)
        return;

    priv->dispose_has_run = TRUE;

    if (priv->channel != NULL) {
        g_signal_handlers_disconnect_by_func (priv->channel,
            tp_chat_invalidated_cb, self);
        g_object_unref (priv->channel);
    }
    priv->channel = NULL;

    if (priv->remote_contact != NULL)
        g_object_unref (priv->remote_contact);
    priv->remote_contact = NULL;

    if (priv->factory != NULL)
        g_object_unref (priv->factory);
    priv->factory = NULL;

    if (priv->user != NULL)
        g_object_unref (priv->user);
    priv->user = NULL;

    if (priv->contact_monitor)
        g_object_unref (priv->contact_monitor);
    priv->contact_monitor = NULL;

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

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

    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)
{
    EmpathyTpChatPriv *priv = GET_PRIV (object);
    guint              i;

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

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

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

    g_queue_free (priv->messages_queue);
    g_queue_free (priv->pending_messages_queue);

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

static void
tp_chat_check_if_ready (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    if (priv->ready || priv->user == NULL ||
        (priv->members == NULL && priv->remote_contact == NULL)) {
        return;
    }

    DEBUG ("Ready!");

    tp_cli_channel_type_text_connect_to_received (priv->channel,
                              tp_chat_received_cb,
                              NULL, NULL,
                              G_OBJECT (chat), NULL);
    priv->listing_pending_messages = TRUE;
    tp_cli_channel_type_text_call_list_pending_messages (priv->channel, -1,
                                 FALSE,
                                 tp_chat_list_pending_messages_cb,
                                 NULL, NULL,
                                 G_OBJECT (chat));

    tp_cli_channel_type_text_connect_to_sent (priv->channel,
                          tp_chat_sent_cb,
                          NULL, NULL,
                          G_OBJECT (chat), NULL);
    tp_cli_channel_type_text_connect_to_send_error (priv->channel,
                            tp_chat_send_error_cb,
                            NULL, NULL,
                            G_OBJECT (chat), NULL);
    tp_cli_channel_interface_chat_state_connect_to_chat_state_changed (priv->channel,
                                       tp_chat_state_changed_cb,
                                       NULL, NULL,
                                       G_OBJECT (chat), NULL);
    tp_cli_channel_interface_chat_state_connect_to_chat_state_changed (priv->channel,
                                       tp_chat_state_changed_cb,
                                       NULL, NULL,
                                       G_OBJECT (chat), NULL);
    priv->ready = TRUE;
    g_object_notify (G_OBJECT (chat), "ready");
}

static void
tp_chat_update_remote_contact (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    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 (priv->channel, &handle_type);
    if (handle_type == TP_HANDLE_TYPE_ROOM) {
        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 (priv->channel);
    for (l = 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 (priv->remote_contact == contact) {
        return;
    }

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

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

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

static void
tp_chat_got_added_contacts_cb (EmpathyTpContactFactory *factory,
                   guint                    n_contacts,
                   EmpathyContact * const * contacts,
                   guint                    n_failed,
                   const TpHandle          *failed,
                   const GError            *error,
                   gpointer                 user_data,
                   GObject                 *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    guint i;
    const TpIntSet *members;
    TpHandle handle;
    EmpathyContact *contact;

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

    members = tp_channel_group_get_members (priv->channel);
    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)) {
            priv->members = g_list_prepend (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));
    tp_chat_check_if_ready (EMPATHY_TP_CHAT (chat));
}

static EmpathyContact *
chat_lookup_contact (EmpathyTpChat *chat,
             TpHandle       handle,
             gboolean       remove)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    GList *l;

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

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

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

        return c;
    }

    return NULL;
}

static void
tp_chat_group_members_changed_cb (TpChannel     *self,
                  gchar         *message,
                  GArray        *added,
                  GArray        *removed,
                  GArray        *local_pending,
                  GArray        *remote_pending,
                  guint          actor,
                  guint          reason,
                  EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    EmpathyContact *contact;
    EmpathyContact *actor_contact = NULL;
    guint i;

    if (actor != 0) {
        actor_contact = chat_lookup_contact (chat, 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 (chat,
            g_array_index (removed, TpHandle, i), TRUE);

        if (contact != NULL) {
            g_signal_emit_by_name (chat, "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 (priv->factory,
            added->len, (TpHandle *) added->data,
            tp_chat_got_added_contacts_cb, NULL, NULL,
            G_OBJECT (chat));
    }

    tp_chat_update_remote_contact (chat);

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

static void
tp_chat_got_remote_contact_cb (EmpathyTpContactFactory *factory,
                   EmpathyContact          *contact,
                   const GError            *error,
                   gpointer                 user_data,
                   GObject                 *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

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

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

    tp_chat_check_if_ready (EMPATHY_TP_CHAT (chat));
}

static void
tp_chat_got_self_contact_cb (EmpathyTpContactFactory *factory,
                 EmpathyContact          *contact,
                 const GError            *error,
                 gpointer                 user_data,
                 GObject                 *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

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

    priv->user = g_object_ref (contact);
    empathy_contact_set_is_user (priv->user, TRUE);
    tp_chat_check_if_ready (EMPATHY_TP_CHAT (chat));
}

static GObject *
tp_chat_constructor (GType                  type,
             guint                  n_props,
             GObjectConstructParam *props)
{
    GObject           *chat;
    EmpathyTpChatPriv *priv;
    TpConnection      *connection;
    TpHandle           handle;

    chat = G_OBJECT_CLASS (empathy_tp_chat_parent_class)->constructor (type, n_props, props);

    priv = GET_PRIV (chat);

    connection = tp_channel_borrow_connection (priv->channel);
    priv->factory = empathy_tp_contact_factory_dup_singleton (connection);
    g_signal_connect (priv->channel, "invalidated",
              G_CALLBACK (tp_chat_invalidated_cb),
              chat);

    if (tp_proxy_has_interface_by_id (priv->channel,
                      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 (priv->channel);
        empathy_tp_contact_factory_get_from_handle (priv->factory,
            handle, tp_chat_got_self_contact_cb,
            NULL, NULL, chat);

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

        g_signal_connect (priv->channel, "group-members-changed",
            G_CALLBACK (tp_chat_group_members_changed_cb), chat);
    } else {
        /* Get the self contact from the connection's self handle */
        handle = tp_connection_get_self_handle (connection);
        empathy_tp_contact_factory_get_from_handle (priv->factory,
            handle, tp_chat_got_self_contact_cb,
            NULL, NULL, chat);

        /* Get the remote contact */
        handle = tp_channel_get_handle (priv->channel, NULL);
        empathy_tp_contact_factory_get_from_handle (priv->factory,
            handle, tp_chat_got_remote_contact_cb,
            NULL, NULL, chat);
    }

    if (tp_proxy_has_interface_by_id (priv->channel,
                      TP_IFACE_QUARK_PROPERTIES_INTERFACE)) {
        tp_cli_properties_interface_call_list_properties (priv->channel, -1,
                                  tp_chat_list_properties_cb,
                                  NULL, NULL,
                                  G_OBJECT (chat));
        tp_cli_properties_interface_connect_to_properties_changed (priv->channel,
                                       tp_chat_properties_changed_cb,
                                       NULL, NULL,
                                       G_OBJECT (chat), NULL);
        tp_cli_properties_interface_connect_to_property_flags_changed (priv->channel,
                                           tp_chat_property_flags_changed_cb,
                                           NULL, NULL,
                                           G_OBJECT (chat), NULL);
    }

    return chat;
}

static void
tp_chat_get_property (GObject    *object,
              guint       param_id,
              GValue     *value,
              GParamSpec *pspec)
{
    EmpathyTpChatPriv *priv = GET_PRIV (object);

    switch (param_id) {
    case PROP_CHANNEL:
        g_value_set_object (value, priv->channel);
        break;
    case PROP_REMOTE_CONTACT:
        g_value_set_object (value, priv->remote_contact);
        break;
    case PROP_READY:
        g_value_set_boolean (value, priv->ready);
        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)
{
    EmpathyTpChatPriv *priv = GET_PRIV (object);

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

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

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

    g_object_class_install_property (object_class,
                     PROP_CHANNEL,
                     g_param_spec_object ("channel",
                                  "telepathy channel",
                                  "The text channel for the chat",
                                  TP_TYPE_CHANNEL,
                                  G_PARAM_READWRITE |
                                  G_PARAM_CONSTRUCT_ONLY));

    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_READY,
                     g_param_spec_boolean ("ready",
                                   "Is the object ready",
                                   "This object can't be used until this becomes true",
                                   FALSE,
                                   G_PARAM_READABLE));

    /* Signals */
    signals[MESSAGE_RECEIVED] =
        g_signal_new ("message-received",
                  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__OBJECT_UINT,
                  G_TYPE_NONE,
                  2, EMPATHY_TYPE_MESSAGE, G_TYPE_UINT);

    signals[CHAT_STATE_CHANGED] =
        g_signal_new ("chat-state-changed",
                  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[DESTROY] =
        g_signal_new ("destroy",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE,
                  0);

    g_type_class_add_private (object_class, sizeof (EmpathyTpChatPriv));
}

static void
empathy_tp_chat_init (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (chat,
        EMPATHY_TYPE_TP_CHAT, EmpathyTpChatPriv);

    chat->priv = priv;
    priv->contact_monitor = NULL;
    priv->messages_queue = g_queue_new ();
    priv->pending_messages_queue = g_queue_new ();
}

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;
    iface->get_monitor = tp_chat_get_monitor;
}

EmpathyTpChat *
empathy_tp_chat_new (TpChannel *channel)
{
    return g_object_new (EMPATHY_TYPE_TP_CHAT,
                 "channel", channel,
                 NULL);
}

void
empathy_tp_chat_close (EmpathyTpChat *chat) {
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    /* If there are still messages left, it'll come back..
     * We loose the ordering of sent messages though */
    tp_cli_channel_call_close (priv->channel, -1, tp_chat_async_cb,
        "closing channel", NULL, NULL);
}

const gchar *
empathy_tp_chat_get_id (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), NULL);

    return tp_channel_get_identifier (priv->channel);
}

EmpathyContact *
empathy_tp_chat_get_remote_contact (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), NULL);
    g_return_val_if_fail (priv->ready, NULL);

    return priv->remote_contact;
}

TpChannel *
empathy_tp_chat_get_channel (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), NULL);

    return priv->channel;
}

TpConnection *
empathy_tp_chat_get_connection (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), NULL);

    return tp_channel_borrow_connection (priv->channel);
}

gboolean
empathy_tp_chat_is_ready (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), FALSE);

    return priv->ready;
}

void
empathy_tp_chat_send (EmpathyTpChat *chat,
              EmpathyMessage *message)
{
    EmpathyTpChatPriv        *priv = GET_PRIV (chat);
    const gchar              *message_body;
    TpChannelTextMessageType  message_type;

    g_return_if_fail (EMPATHY_IS_TP_CHAT (chat));
    g_return_if_fail (EMPATHY_IS_MESSAGE (message));
    g_return_if_fail (priv->ready);

    message_body = empathy_message_get_body (message);
    message_type = empathy_message_get_tptype (message);

    DEBUG ("Sending message: %s", message_body);
    tp_cli_channel_type_text_call_send (priv->channel, -1,
                        message_type,
                        message_body,
                        tp_chat_send_cb,
                        g_object_ref (message),
                        (GDestroyNotify) g_object_unref,
                        G_OBJECT (chat));
}

void
empathy_tp_chat_set_state (EmpathyTpChat      *chat,
               TpChannelChatState  state)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_if_fail (EMPATHY_IS_TP_CHAT (chat));
    g_return_if_fail (priv->ready);

    DEBUG ("Set state: %d", state);
    tp_cli_channel_interface_chat_state_call_set_chat_state (priv->channel, -1,
                                 state,
                                 tp_chat_async_cb,
                                 "setting chat state",
                                 NULL,
                                 G_OBJECT (chat));
}


const GList *
empathy_tp_chat_get_pending_messages (EmpathyTpChat *chat)
{
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    g_return_val_if_fail (EMPATHY_IS_TP_CHAT (chat), NULL);
    g_return_val_if_fail (priv->ready, NULL);

    return priv->pending_messages_queue->head;
}

static void
acknowledge_messages (EmpathyTpChat *chat, GArray *ids) {
    EmpathyTpChatPriv *priv = GET_PRIV (chat);

    tp_cli_channel_type_text_call_acknowledge_pending_messages (
        priv->channel, -1, ids, tp_chat_async_cb,
        "acknowledging received message", NULL, G_OBJECT (chat));
}

void
empathy_tp_chat_acknowledge_message (EmpathyTpChat *chat,
                     EmpathyMessage *message) {
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    GArray *message_ids;
    GList *m;
    guint id;

    g_return_if_fail (EMPATHY_IS_TP_CHAT (chat));
    g_return_if_fail (priv->ready);

    if (empathy_message_get_sender (message) == priv->user)
        goto out;

    message_ids = g_array_sized_new (FALSE, FALSE, sizeof (guint), 1);

    id = empathy_message_get_id (message);
    g_array_append_val (message_ids, id);
    acknowledge_messages (chat, message_ids);
    g_array_free (message_ids, TRUE);

out:
    m = g_queue_find (priv->pending_messages_queue, message);
    g_assert (m != NULL);
    g_queue_delete_link (priv->pending_messages_queue, m);
    g_object_unref (message);
}

void
empathy_tp_chat_acknowledge_messages (EmpathyTpChat *chat,
                      const GList *messages) {
    EmpathyTpChatPriv *priv = GET_PRIV (chat);
    /* Copy messages as the messges list (probably is) our own */
    GList *msgs = g_list_copy ((GList *) messages);
    GList *l;
    guint length;
    GArray *message_ids;

    g_return_if_fail (EMPATHY_IS_TP_CHAT (chat));
    g_return_if_fail (priv->ready);

    length = g_list_length ((GList *) messages);

    if (length == 0)
        return;

    message_ids = g_array_sized_new (FALSE, FALSE, sizeof (guint), length);

    for (l = msgs; l != NULL; l = g_list_next (l)) {
        GList *m;

        EmpathyMessage *message = EMPATHY_MESSAGE (l->data);

        m = g_queue_find (priv->pending_messages_queue, message);
        g_assert (m != NULL);
        g_queue_delete_link (priv->pending_messages_queue, m);

        if (empathy_message_get_sender (message) != priv->user) {
            guint id = empathy_message_get_id (message);
            g_array_append_val (message_ids, id);
        }
        g_object_unref (message);
    }

    if (message_ids->len > 0)
        acknowledge_messages (chat, message_ids);

    g_array_free (message_ids, TRUE);
    g_list_free (msgs);
}