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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2002-2007 Imendio AB
 * Copyright (C) 2007 Collabora Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 * 
 * Authors: Mikael Hallendal <micke@imendio.com>
 *          Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Geert-Jan Van den Bogaerde <geertjan@gnome.org>
 *          Xavier Claessens <xclaesse@gmail.com>
 */

#include "config.h"

#include <string.h>
#include <stdlib.h>

#include <gdk/gdkkeysyms.h>
#include <glib/gi18n.h>
#include <gtk/gtk.h>

#include <libempathy/empathy-contact-manager.h>
#include <libempathy/empathy-log-manager.h>
#include <libempathy/empathy-debug.h>
#include <libempathy/empathy-utils.h>
#include <libempathy/empathy-conf.h>
#include <libempathy/empathy-marshal.h>

#include "empathy-chat.h"
#include "empathy-chat-window.h"
#include "empathy-geometry.h"
#include "empathy-preferences.h"
#include "empathy-spell.h"
#include "empathy-spell-dialog.h"
#include "empathy-ui-utils.h"

#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), EMPATHY_TYPE_CHAT, EmpathyChatPriv))

#define DEBUG_DOMAIN "Chat"

#define CHAT_DIR_CREATE_MODE  (S_IRUSR | S_IWUSR | S_IXUSR)
#define CHAT_FILE_CREATE_MODE (S_IRUSR | S_IWUSR)

#define IS_ENTER(v) (v == GDK_Return || v == GDK_ISO_Enter || v == GDK_KP_Enter)

#define MAX_INPUT_HEIGHT 150

#define COMPOSING_STOP_TIMEOUT 5

struct _EmpathyChatPriv {
    EmpathyContactManager *manager;
    EmpathyLogManager     *log_manager;
    EmpathyTpChat         *tp_chat;
    EmpathyChatWindow      *window;
    GtkTooltips           *tooltips;
    guint                  composing_stop_timeout_id;
    gboolean               sensitive;
    gchar                 *id;
    GSList                *sent_messages;
    gint                   sent_messages_index;
    GList                 *compositors;
    guint                  scroll_idle_id;
    gboolean               first_tp_chat;
    EmpathyTime            last_log_timestamp;
    /* Used to automatically shrink a window that has temporarily
     * grown due to long input. 
     */
    gint                   padding_height;
    gint                   default_window_height;
    gint                   last_input_height;
    gboolean               vscroll_visible;
};

typedef struct {
    EmpathyChat  *chat;
    gchar       *word;

    GtkTextIter  start;
    GtkTextIter  end;
} EmpathyChatSpell;

static void             empathy_chat_class_init           (EmpathyChatClass              *klass);
static void             empathy_chat_init                 (EmpathyChat                   *chat);
static void             chat_finalize                     (GObject                       *object);
static void             chat_destroy_cb                   (EmpathyTpChat                 *tp_chat,
                               EmpathyChat                   *chat);
static void             chat_send                         (EmpathyChat                   *chat,
                               const gchar                   *msg);
static void             chat_input_text_view_send         (EmpathyChat                   *chat);
static void             chat_message_received_cb          (EmpathyTpChat                 *tp_chat,
                               EmpathyMessage                *message,
                               EmpathyChat                   *chat);
static void             chat_send_error_cb                (EmpathyTpChat                 *tp_chat,
                               EmpathyMessage                *message,
                               TelepathyChannelTextSendError  error_code,
                               EmpathyChat                   *chat);
void                    chat_sent_message_add             (EmpathyChat                   *chat,
                               const gchar                   *str);
const gchar *           chat_sent_message_get_next        (EmpathyChat                   *chat);
const gchar *           chat_sent_message_get_last        (EmpathyChat                   *chat);
static gboolean         chat_input_key_press_event_cb     (GtkWidget                     *widget,
                               GdkEventKey                   *event,
                               EmpathyChat                   *chat);
static void             chat_input_text_buffer_changed_cb (GtkTextBuffer                 *buffer,
                               EmpathyChat                   *chat);
static gboolean         chat_text_view_focus_in_event_cb  (GtkWidget                     *widget,
                               GdkEvent                      *event,
                               EmpathyChat                   *chat);
static void             chat_text_view_scroll_hide_cb     (GtkWidget                     *widget,
                               EmpathyChat                   *chat);
static void             chat_text_view_size_allocate_cb   (GtkWidget                     *widget,
                               GtkAllocation                 *allocation,
                               EmpathyChat                   *chat);
static void             chat_text_view_realize_cb         (GtkWidget                     *widget,
                               EmpathyChat                   *chat);
static void             chat_text_populate_popup_cb       (GtkTextView                   *view,
                               GtkMenu                       *menu,
                               EmpathyChat                   *chat);
static void             chat_text_check_word_spelling_cb  (GtkMenuItem                   *menuitem,
                               EmpathyChatSpell              *chat_spell);
static EmpathyChatSpell *chat_spell_new                   (EmpathyChat                   *chat,
                               const gchar                   *word,
                               GtkTextIter                    start,
                               GtkTextIter                    end);
static void             chat_spell_free                   (EmpathyChatSpell              *chat_spell);
static void             chat_composing_start              (EmpathyChat                   *chat);
static void             chat_composing_stop               (EmpathyChat                   *chat);
static void             chat_composing_remove_timeout     (EmpathyChat                   *chat);
static gboolean         chat_composing_stop_timeout_cb    (EmpathyChat                   *chat);
static void             chat_state_changed_cb             (EmpathyTpChat                 *tp_chat,
                               EmpathyContact                *contact,
                               TelepathyChannelChatState      state,
                               EmpathyChat                   *chat);
static void             chat_add_logs                     (EmpathyChat                   *chat);
static gboolean         chat_scroll_down_idle_func        (EmpathyChat                   *chat);

enum {
    COMPOSING,
    NEW_MESSAGE,
    NAME_CHANGED,
    STATUS_CHANGED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

G_DEFINE_TYPE (EmpathyChat, empathy_chat, G_TYPE_OBJECT);

static void
empathy_chat_class_init (EmpathyChatClass *klass)
{
    GObjectClass *object_class;

    object_class = G_OBJECT_CLASS (klass);

    object_class->finalize = chat_finalize;

    signals[COMPOSING] =
        g_signal_new ("composing",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__BOOLEAN,
                  G_TYPE_NONE,
                  1, G_TYPE_BOOLEAN);

    signals[NEW_MESSAGE] =
        g_signal_new ("new-message",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  empathy_marshal_VOID__OBJECT_BOOLEAN,
                  G_TYPE_NONE,
                  2, EMPATHY_TYPE_MESSAGE, G_TYPE_BOOLEAN);

    signals[NAME_CHANGED] =
        g_signal_new ("name-changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE,
                  1, G_TYPE_POINTER);

    signals[STATUS_CHANGED] =
        g_signal_new ("status-changed",
                  G_OBJECT_CLASS_TYPE (object_class),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE,
                  0);

    g_type_class_add_private (object_class, sizeof (EmpathyChatPriv));
}

static void
empathy_chat_init (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;
    GtkTextBuffer  *buffer;

    chat->view = empathy_chat_view_new ();
    chat->input_text_view = gtk_text_view_new ();

    chat->is_first_char = TRUE;

    g_object_set (chat->input_text_view,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              "pixels-inside-wrap", 1,
              "right-margin", 2,
              "left-margin", 2,
              "wrap-mode", GTK_WRAP_WORD_CHAR,
              NULL);

    priv = GET_PRIV (chat);

    priv->manager = empathy_contact_manager_new ();
    priv->log_manager = empathy_log_manager_new ();
    priv->tooltips = g_object_ref_sink (gtk_tooltips_new ());
    priv->default_window_height = -1;
    priv->vscroll_visible = FALSE;
    priv->sensitive = TRUE;
    priv->sent_messages = NULL;
    priv->sent_messages_index = -1;
    priv->first_tp_chat = TRUE;

    g_signal_connect (chat->input_text_view,
              "key_press_event",
              G_CALLBACK (chat_input_key_press_event_cb),
              chat);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));
    g_signal_connect (buffer,
              "changed",
              G_CALLBACK (chat_input_text_buffer_changed_cb),
              chat);
    g_signal_connect (chat->view,
              "focus_in_event",
              G_CALLBACK (chat_text_view_focus_in_event_cb),
              chat);

    g_signal_connect (chat->input_text_view,
              "size_allocate",
              G_CALLBACK (chat_text_view_size_allocate_cb),
              chat);

    g_signal_connect (chat->input_text_view,
              "realize",
              G_CALLBACK (chat_text_view_realize_cb),
              chat);

    g_signal_connect (GTK_TEXT_VIEW (chat->input_text_view),
              "populate_popup",
              G_CALLBACK (chat_text_populate_popup_cb),
              chat);

    /* create misspelt words identification tag */
    gtk_text_buffer_create_tag (buffer,
                    "misspelled",
                    "underline", PANGO_UNDERLINE_ERROR,
                    NULL);
}

static void
chat_finalize (GObject *object)
{
    EmpathyChat     *chat;
    EmpathyChatPriv *priv;

    chat = EMPATHY_CHAT (object);
    priv = GET_PRIV (chat);

    empathy_debug (DEBUG_DOMAIN, "Finalized: %p", object);

    g_slist_foreach (priv->sent_messages, (GFunc) g_free, NULL);
    g_slist_free (priv->sent_messages);

    g_list_foreach (priv->compositors, (GFunc) g_object_unref, NULL);
    g_list_free (priv->compositors);

    chat_composing_remove_timeout (chat);
    g_object_unref (chat->account);
    g_object_unref (priv->manager);
    g_object_unref (priv->log_manager);
    g_object_unref (priv->tooltips);

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

    if (priv->scroll_idle_id) {
        g_source_remove (priv->scroll_idle_id);
    }

    g_free (priv->id);

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

static void
chat_destroy_cb (EmpathyTpChat *tp_chat,
         EmpathyChat    *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    if (priv->tp_chat) {
        g_object_unref (priv->tp_chat);
        priv->tp_chat = NULL;
    }
    priv->sensitive = FALSE;

    empathy_chat_view_append_event (chat->view, _("Disconnected"));
    gtk_widget_set_sensitive (chat->input_text_view, FALSE);

    if (EMPATHY_CHAT_GET_CLASS (chat)->set_tp_chat) {
        EMPATHY_CHAT_GET_CLASS (chat)->set_tp_chat (chat, NULL);
    }
}

static void
chat_send (EmpathyChat  *chat,
       const gchar *msg)
{
    EmpathyChatPriv *priv;
    EmpathyMessage  *message;

    priv = GET_PRIV (chat);

    if (G_STR_EMPTY (msg)) {
        return;
    }

    chat_sent_message_add (chat, msg);

    if (g_str_has_prefix (msg, "/clear")) {
        empathy_chat_view_clear (chat->view);
        return;
    }

    /* FIXME: add here something to let group/privrate chat handle
     *        some special messages */

    message = empathy_message_new (msg);

    empathy_tp_chat_send (priv->tp_chat, message);

    g_object_unref (message);
}

static void
chat_input_text_view_send (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;
    GtkTextBuffer  *buffer;
    GtkTextIter     start, end;
    gchar          *msg;

    priv = GET_PRIV (chat);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));

    gtk_text_buffer_get_bounds (buffer, &start, &end);
    msg = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);

    /* clear the input field */
    gtk_text_buffer_set_text (buffer, "", -1);

    chat_send (chat, msg);

    g_free (msg);

    chat->is_first_char = TRUE;
}

static void
chat_message_received_cb (EmpathyTpChat  *tp_chat,
              EmpathyMessage *message,
              EmpathyChat    *chat)
{
    EmpathyChatPriv *priv;
    EmpathyContact  *sender;
    EmpathyTime      timestamp;

    priv = GET_PRIV (chat);

    timestamp = empathy_message_get_timestamp (message);
    if (timestamp <= priv->last_log_timestamp) {
        /* Do not take care of messages anterior of the last
         * logged message. Some Jabber chatroom sends messages
         * received before we joined the room, this avoid
         * displaying those messages if we already logged them
         * last time we joined that room. */
        empathy_debug (DEBUG_DOMAIN, "Skipping message because it is "
                   "anterior of last logged message.");
        return;
    }

    sender = empathy_message_get_sender (message);
    empathy_debug (DEBUG_DOMAIN, "Appending message ('%s')",
              empathy_contact_get_name (sender));

    empathy_log_manager_add_message (priv->log_manager,
                     empathy_chat_get_id (chat),
                     empathy_chat_is_group_chat (chat),
                     message);

    empathy_chat_view_append_message (chat->view, message);

    if (empathy_chat_should_play_sound (chat)) {
        // FIXME: empathy_sound_play (EMPATHY_SOUND_CHAT);
    }

    g_signal_emit (chat, signals[NEW_MESSAGE], 0, message, FALSE);
}

static void
chat_send_error_cb (EmpathyTpChat                 *tp_chat,
            EmpathyMessage                *message,
            TelepathyChannelTextSendError  error_code,
            EmpathyChat                   *chat)
{
    const gchar *error;
    gchar       *str;

    switch (error_code) {
    case TP_CHANNEL_TEXT_SEND_ERROR_OFFLINE:
        error = _("offline");
        break;
    case TP_CHANNEL_TEXT_SEND_ERROR_INVALID_CONTACT:
        error = _("invalid contact");
        break;
    case TP_CHANNEL_TEXT_SEND_ERROR_PERMISSION_DENIED:
        error = _("permission denied");
        break;
    case TP_CHANNEL_TEXT_SEND_ERROR_TOO_LONG:
        error = _("too long message");
        break;
    case TP_CHANNEL_TEXT_SEND_ERROR_NOT_IMPLEMENTED:
        error = _("not implemented");
        break;
    default:
        error = _("unknown");
        break;
    }

    str = g_strdup_printf (_("Error sending message '%s': %s"),
                   empathy_message_get_body (message),
                   error);
    empathy_chat_view_append_event (chat->view, str);
    g_free (str);
}

void 
chat_sent_message_add (EmpathyChat  *chat,
               const gchar *str)
{
    EmpathyChatPriv *priv;
    GSList         *list;
    GSList         *item;

    priv = GET_PRIV (chat);

    /* Save the sent message in our repeat buffer */
    list = priv->sent_messages;
    
    /* Remove any other occurances of this msg */
    while ((item = g_slist_find_custom (list, str, (GCompareFunc) strcmp)) != NULL) {
        list = g_slist_remove_link (list, item);
        g_free (item->data);
        g_slist_free1 (item);
    }

    /* Trim the list to the last 10 items */
    while (g_slist_length (list) > 10) {
        item = g_slist_last (list);
        if (item) {
            list = g_slist_remove_link (list, item);
            g_free (item->data);
            g_slist_free1 (item);
        }
    }

    /* Add new message */
    list = g_slist_prepend (list, g_strdup (str));

    /* Set list and reset the index */
    priv->sent_messages = list;
    priv->sent_messages_index = -1;
}

const gchar *
chat_sent_message_get_next (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;
    gint            max;
    
    priv = GET_PRIV (chat);

    if (!priv->sent_messages) {
        empathy_debug (DEBUG_DOMAIN, 
                  "No sent messages, next message is NULL");
        return NULL;
    }

    max = g_slist_length (priv->sent_messages) - 1;

    if (priv->sent_messages_index < max) {
        priv->sent_messages_index++;
    }
    
    empathy_debug (DEBUG_DOMAIN, 
              "Returning next message index:%d",
              priv->sent_messages_index);

    return g_slist_nth_data (priv->sent_messages, priv->sent_messages_index);
}

const gchar *
chat_sent_message_get_last (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), NULL);

    priv = GET_PRIV (chat);
    
    if (!priv->sent_messages) {
        empathy_debug (DEBUG_DOMAIN, 
                  "No sent messages, last message is NULL");
        return NULL;
    }

    if (priv->sent_messages_index >= 0) {
        priv->sent_messages_index--;
    }

    empathy_debug (DEBUG_DOMAIN, 
              "Returning last message index:%d",
              priv->sent_messages_index);

    return g_slist_nth_data (priv->sent_messages, priv->sent_messages_index);
}

static gboolean
chat_input_key_press_event_cb (GtkWidget   *widget,
                   GdkEventKey *event,
                   EmpathyChat  *chat)
{
    EmpathyChatPriv *priv;
    GtkAdjustment  *adj;
    gdouble         val;
    GtkWidget      *text_view_sw;

    priv = GET_PRIV (chat);

    if (event->keyval == GDK_Tab && !(event->state & GDK_CONTROL_MASK)) {
        return TRUE;
    }

    /* Catch ctrl+up/down so we can traverse messages we sent */
    if ((event->state & GDK_CONTROL_MASK) && 
        (event->keyval == GDK_Up || 
         event->keyval == GDK_Down)) {
        GtkTextBuffer *buffer;
        const gchar   *str;

        buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));

        if (event->keyval == GDK_Up) {
            str = chat_sent_message_get_next (chat);
        } else {
            str = chat_sent_message_get_last (chat);
        }

        g_signal_handlers_block_by_func (buffer, 
                         chat_input_text_buffer_changed_cb,
                         chat);
        gtk_text_buffer_set_text (buffer, str ? str : "", -1);
        g_signal_handlers_unblock_by_func (buffer, 
                           chat_input_text_buffer_changed_cb,
                           chat);

        return TRUE;    
    }

    /* Catch enter but not ctrl/shift-enter */
    if (IS_ENTER (event->keyval) && !(event->state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK))) {
        GtkTextView *view;

        /* This is to make sure that kinput2 gets the enter. And if
         * it's handled there we shouldn't send on it. This is because
         * kinput2 uses Enter to commit letters. See:
         * http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=104299
         */

        view = GTK_TEXT_VIEW (chat->input_text_view);
        if (gtk_im_context_filter_keypress (view->im_context, event)) {
            GTK_TEXT_VIEW (chat->input_text_view)->need_im_reset = TRUE;
            return TRUE;
        }

        chat_input_text_view_send (chat);
        return TRUE;
    }

    text_view_sw = gtk_widget_get_parent (GTK_WIDGET (chat->view));

    if (IS_ENTER (event->keyval) && (event->state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK))) {
        /* Newline for shift-enter. */
        return FALSE;
    }
    else if ((event->state & GDK_CONTROL_MASK) != GDK_CONTROL_MASK &&
         event->keyval == GDK_Page_Up) {
        adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (text_view_sw));
        gtk_adjustment_set_value (adj, adj->value - adj->page_size);

        return TRUE;
    }
    else if ((event->state & GDK_CONTROL_MASK) != GDK_CONTROL_MASK &&
         event->keyval == GDK_Page_Down) {
        adj = gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (text_view_sw));
        val = MIN (adj->value + adj->page_size, adj->upper - adj->page_size);
        gtk_adjustment_set_value (adj, val);

        return TRUE;
    }

    return FALSE;
}

static gboolean
chat_text_view_focus_in_event_cb (GtkWidget  *widget,
                  GdkEvent   *event,
                  EmpathyChat *chat)
{
    gtk_widget_grab_focus (chat->input_text_view);

    return TRUE;
}

static void
chat_input_text_buffer_changed_cb (GtkTextBuffer *buffer,
                   EmpathyChat    *chat)
{
    EmpathyChatPriv *priv;
    GtkTextIter     start, end;
    gchar          *str;
    gboolean        spell_checker = FALSE;

    priv = GET_PRIV (chat);

    if (gtk_text_buffer_get_char_count (buffer) == 0) {
        chat_composing_stop (chat);
    } else {
        chat_composing_start (chat);
    }

    empathy_conf_get_bool (empathy_conf_get (),
                  EMPATHY_PREFS_CHAT_SPELL_CHECKER_ENABLED,
                  &spell_checker);

    if (chat->is_first_char) {
        GtkRequisition  req;
        gint            window_height;
        GtkWidget      *dialog;
        GtkAllocation  *allocation;

        /* Save the window's size */
        dialog = empathy_chat_window_get_dialog (priv->window);
        gtk_window_get_size (GTK_WINDOW (dialog),
                     NULL, &window_height);

        gtk_widget_size_request (chat->input_text_view, &req);

        allocation = &GTK_WIDGET (chat->view)->allocation;

        priv->default_window_height = window_height;
        priv->last_input_height = req.height;
        priv->padding_height = window_height - req.height - allocation->height;

        chat->is_first_char = FALSE;
    }

    gtk_text_buffer_get_start_iter (buffer, &start);

    if (!spell_checker) {
        gtk_text_buffer_get_end_iter (buffer, &end);
        gtk_text_buffer_remove_tag_by_name (buffer, "misspelled", &start, &end);
        return;
    }

    if (!empathy_spell_supported ()) {
        return;
    }

    /* NOTE: this is really inefficient, we shouldn't have to
       reiterate the whole buffer each time and check each work
       every time. */
    while (TRUE) {
        gboolean correct = FALSE;

        /* if at start */
        if (gtk_text_iter_is_start (&start)) {
            end = start;

            if (!gtk_text_iter_forward_word_end (&end)) {
                /* no whole word yet */
                break;
            }
        } else {
            if (!gtk_text_iter_forward_word_end (&end)) {
                /* must be the end of the buffer */
                break;
            }

            start = end;
            gtk_text_iter_backward_word_start (&start);
        }

        str = gtk_text_buffer_get_text (buffer, &start, &end, FALSE);

        /* spell check string */
        if (!empathy_chat_get_is_command (str)) {
            correct = empathy_spell_check (str);
        } else {
            correct = TRUE;
        }

        if (!correct) {
            gtk_text_buffer_apply_tag_by_name (buffer, "misspelled", &start, &end);
        } else {
            gtk_text_buffer_remove_tag_by_name (buffer, "misspelled", &start, &end);
        }

        g_free (str);

        /* set start iter to the end iters position */
        start = end;
    }
}

typedef struct {
    GtkWidget *window;
    gint       width;
    gint       height;
} ChangeSizeData;

static gboolean
chat_change_size_in_idle_cb (ChangeSizeData *data)
{
    gtk_window_resize (GTK_WINDOW (data->window),
               data->width, data->height);

    return FALSE;
}

static void
chat_text_view_scroll_hide_cb (GtkWidget  *widget,
                   EmpathyChat *chat)
{
    EmpathyChatPriv *priv;
    GtkWidget      *sw;

    priv = GET_PRIV (chat);

    priv->vscroll_visible = FALSE;
    g_signal_handlers_disconnect_by_func (widget, chat_text_view_scroll_hide_cb, chat);

    sw = gtk_widget_get_parent (chat->input_text_view);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                    GTK_POLICY_NEVER,
                    GTK_POLICY_NEVER);
    g_object_set (sw, "height-request", -1, NULL);
}

static void
chat_text_view_size_allocate_cb (GtkWidget     *widget,
                 GtkAllocation *allocation,
                 EmpathyChat    *chat)
{
    EmpathyChatPriv *priv;
    gint            width;
    GtkWidget      *dialog;
    ChangeSizeData *data;
    gint            window_height;
    gint            new_height;
    GtkAllocation  *view_allocation;
    gint            current_height;
    gint            diff;
    GtkWidget      *sw;

    priv = GET_PRIV (chat);

    if (priv->default_window_height <= 0) {
        return;
    }

    sw = gtk_widget_get_parent (widget);
    if (sw->allocation.height >= MAX_INPUT_HEIGHT && !priv->vscroll_visible) {
        GtkWidget *vscroll;

        priv->vscroll_visible = TRUE;
        gtk_widget_set_size_request (sw, sw->allocation.width, MAX_INPUT_HEIGHT);
        gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
                        GTK_POLICY_NEVER,
                        GTK_POLICY_AUTOMATIC);
        vscroll = gtk_scrolled_window_get_vscrollbar (GTK_SCROLLED_WINDOW (sw));
        g_signal_connect (vscroll, "hide",
                  G_CALLBACK (chat_text_view_scroll_hide_cb),
                  chat);
    }

    if (priv->last_input_height <= allocation->height) {
        priv->last_input_height = allocation->height;
        return;
    }

    diff = priv->last_input_height - allocation->height;
    priv->last_input_height = allocation->height;

    view_allocation = &GTK_WIDGET (chat->view)->allocation;

    dialog = empathy_chat_window_get_dialog (priv->window);
    gtk_window_get_size (GTK_WINDOW (dialog), NULL, &current_height);

    new_height = view_allocation->height + priv->padding_height + allocation->height - diff;

    if (new_height <= priv->default_window_height) {
        window_height = priv->default_window_height;
    } else {
        window_height = new_height;
    }

    if (current_height <= window_height) {
        return;
    }

    /* Restore the window's size */
    gtk_window_get_size (GTK_WINDOW (dialog), &width, NULL);

    data = g_new0 (ChangeSizeData, 1);
    data->window = dialog;
    data->width  = width;
    data->height = window_height;

    g_idle_add_full (G_PRIORITY_DEFAULT_IDLE,
             (GSourceFunc) chat_change_size_in_idle_cb,
             data, g_free);
}

static void
chat_text_view_realize_cb (GtkWidget  *widget,
               EmpathyChat *chat)
{
    empathy_debug (DEBUG_DOMAIN, "Setting focus to the input text view");
    gtk_widget_grab_focus (widget);
}

static void
chat_insert_smiley_activate_cb (GtkWidget   *menuitem,
                EmpathyChat *chat)
{
    GtkTextBuffer *buffer;
    GtkTextIter    iter;
    const gchar   *smiley;

    smiley = g_object_get_data (G_OBJECT (menuitem), "smiley_text");

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));

    gtk_text_buffer_get_end_iter (buffer, &iter);
    gtk_text_buffer_insert (buffer, &iter, smiley, -1);

    gtk_text_buffer_get_end_iter (buffer, &iter);
    gtk_text_buffer_insert (buffer, &iter, " ", -1);
}

static void
chat_text_populate_popup_cb (GtkTextView *view,
                 GtkMenu     *menu,
                 EmpathyChat  *chat)
{
    EmpathyChatPriv  *priv;
    GtkTextBuffer   *buffer;
    GtkTextTagTable *table;
    GtkTextTag      *tag;
    gint             x, y;
    GtkTextIter      iter, start, end;
    GtkWidget       *item;
    gchar           *str = NULL;
    EmpathyChatSpell *chat_spell;
    GtkWidget       *smiley_menu;

    priv = GET_PRIV (chat);

    /* Add the emoticon menu. */
    item = gtk_separator_menu_item_new ();
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
    gtk_widget_show (item);

    item = gtk_menu_item_new_with_mnemonic (_("Insert Smiley"));
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
    gtk_widget_show (item);

    smiley_menu = empathy_chat_view_get_smiley_menu (
        G_CALLBACK (chat_insert_smiley_activate_cb),
        chat,
        priv->tooltips);
    gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), smiley_menu);

    /* Add the spell check menu item. */
    buffer = gtk_text_view_get_buffer (view);
    table = gtk_text_buffer_get_tag_table (buffer);

    tag = gtk_text_tag_table_lookup (table, "misspelled");

    gtk_widget_get_pointer (GTK_WIDGET (view), &x, &y);

    gtk_text_view_window_to_buffer_coords (GTK_TEXT_VIEW (view),
                           GTK_TEXT_WINDOW_WIDGET,
                           x, y,
                           &x, &y);

    gtk_text_view_get_iter_at_location (GTK_TEXT_VIEW (view), &iter, x, y);

    start = end = iter;

    if (gtk_text_iter_backward_to_tag_toggle (&start, tag) &&
        gtk_text_iter_forward_to_tag_toggle (&end, tag)) {

        str = gtk_text_buffer_get_text (buffer,
                        &start, &end, FALSE);
    }

    if (G_STR_EMPTY (str)) {
        return;
    }

    chat_spell = chat_spell_new (chat, str, start, end);

    g_object_set_data_full (G_OBJECT (menu),
                "chat_spell", chat_spell,
                (GDestroyNotify) chat_spell_free);

    item = gtk_separator_menu_item_new ();
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
    gtk_widget_show (item);

    item = gtk_menu_item_new_with_mnemonic (_("_Check Word Spelling..."));
    g_signal_connect (item,
              "activate",
              G_CALLBACK (chat_text_check_word_spelling_cb),
              chat_spell);
    gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
    gtk_widget_show (item);
}

static void
chat_text_check_word_spelling_cb (GtkMenuItem     *menuitem,
                  EmpathyChatSpell *chat_spell)
{
    empathy_spell_dialog_show (chat_spell->chat,
                  chat_spell->start,
                  chat_spell->end,
                  chat_spell->word);
}

static EmpathyChatSpell *
chat_spell_new (EmpathyChat  *chat,
        const gchar *word,
        GtkTextIter  start,
        GtkTextIter  end)
{
    EmpathyChatSpell *chat_spell;

    chat_spell = g_new0 (EmpathyChatSpell, 1);

    chat_spell->chat = g_object_ref (chat);
    chat_spell->word = g_strdup (word);
    chat_spell->start = start;
    chat_spell->end = end;

    return chat_spell;
}

static void
chat_spell_free (EmpathyChatSpell *chat_spell)
{
    g_object_unref (chat_spell->chat);
    g_free (chat_spell->word);
    g_free (chat_spell);
}

static void
chat_composing_start (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    if (priv->composing_stop_timeout_id) {
        /* Just restart the timeout */
        chat_composing_remove_timeout (chat);
    } else {
        empathy_tp_chat_set_state (priv->tp_chat,
                       TP_CHANNEL_CHAT_STATE_COMPOSING);
    }

    priv->composing_stop_timeout_id = g_timeout_add (
        1000 * COMPOSING_STOP_TIMEOUT,
        (GSourceFunc) chat_composing_stop_timeout_cb,
        chat);
}

static void
chat_composing_stop (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    chat_composing_remove_timeout (chat);
    empathy_tp_chat_set_state (priv->tp_chat,
                   TP_CHANNEL_CHAT_STATE_ACTIVE);
}

static void
chat_composing_remove_timeout (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    if (priv->composing_stop_timeout_id) {
        g_source_remove (priv->composing_stop_timeout_id);
        priv->composing_stop_timeout_id = 0;
    }
}

static gboolean
chat_composing_stop_timeout_cb (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    priv->composing_stop_timeout_id = 0;
    empathy_tp_chat_set_state (priv->tp_chat,
                   TP_CHANNEL_CHAT_STATE_PAUSED);

    return FALSE;
}

static void
chat_state_changed_cb (EmpathyTpChat             *tp_chat,
               EmpathyContact             *contact,
               TelepathyChannelChatState  state,
               EmpathyChat                *chat)
{
    EmpathyChatPriv *priv;
    GList          *l;
    gboolean        was_composing;

    priv = GET_PRIV (chat);

    if (empathy_contact_is_user (contact)) {
        /* We don't care about our own chat state */
        return;
    }

    was_composing = (priv->compositors != NULL);

    /* Find the contact in the list. After that l is the list elem or NULL */
    for (l = priv->compositors; l; l = l->next) {
        if (empathy_contact_equal (contact, l->data)) {
            break;
        }
    }

    switch (state) {
    case TP_CHANNEL_CHAT_STATE_GONE:
    case TP_CHANNEL_CHAT_STATE_INACTIVE:
    case TP_CHANNEL_CHAT_STATE_ACTIVE:
        /* Contact is not composing */
        if (l) {
            priv->compositors = g_list_remove_link (priv->compositors, l);
            g_object_unref (l->data);
            g_list_free1 (l);
        }
        break;
    case TP_CHANNEL_CHAT_STATE_PAUSED:
    case TP_CHANNEL_CHAT_STATE_COMPOSING:
        /* Contact is composing */
        if (!l) {
            priv->compositors = g_list_prepend (priv->compositors,
                                g_object_ref (contact));
        }
        break;
    default:
        g_assert_not_reached ();
    }

    empathy_debug (DEBUG_DOMAIN, "Was composing: %s now composing: %s",
              was_composing ? "yes" : "no",
              priv->compositors ? "yes" : "no");

    if ((was_composing && !priv->compositors) ||
        (!was_composing && priv->compositors)) {
        /* Composing state changed */
        g_signal_emit (chat, signals[COMPOSING], 0,
                   priv->compositors != NULL);
    }
}

static void
chat_add_logs (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;
    GList          *messages, *l;
    guint           num_messages;
    guint           i;

    priv = GET_PRIV (chat);

    /* Turn off scrolling temporarily */
    empathy_chat_view_scroll (chat->view, FALSE);

    /* Add messages from last conversation */
    messages = empathy_log_manager_get_last_messages (priv->log_manager,
                              chat->account,
                              empathy_chat_get_id (chat),
                              empathy_chat_is_group_chat (chat));
    num_messages  = g_list_length (messages);

    for (l = messages, i = 0; l; l = l->next, i++) {
        EmpathyMessage *message;

        message = l->data;

        /* Only add 10 last messages */
        if (num_messages - i > 10) {
            g_object_unref (message);
            continue;
        }

        priv->last_log_timestamp = empathy_message_get_timestamp (message);
        empathy_chat_view_append_message (chat->view, message);

        g_object_unref (message);
    }
    g_list_free (messages);

    /* Turn back on scrolling */
    empathy_chat_view_scroll (chat->view, TRUE);

    /* Scroll to the most recent messages, we reference the chat
     * for the duration of the scroll func.
     */
    priv->scroll_idle_id = g_idle_add ((GSourceFunc) chat_scroll_down_idle_func, 
                       g_object_ref (chat));
}

/* Scroll down after the back-log has been received. */
static gboolean
chat_scroll_down_idle_func (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    empathy_chat_scroll_down (chat);
    g_object_unref (chat);

    priv->scroll_idle_id = 0;

    return FALSE;
}

gboolean
empathy_chat_get_is_command (const gchar *str)
{
    g_return_val_if_fail (str != NULL, FALSE);

    if (str[0] != '/') {
        return FALSE;
    }

    if (g_str_has_prefix (str, "/me")) {
        return TRUE;
    }
    else if (g_str_has_prefix (str, "/nick")) {
        return TRUE;
    }
    else if (g_str_has_prefix (str, "/topic")) {
        return TRUE;
    }

    return FALSE;
}

void
empathy_chat_correct_word (EmpathyChat  *chat,
              GtkTextIter  start,
              GtkTextIter  end,
              const gchar *new_word)
{
    GtkTextBuffer *buffer;

    g_return_if_fail (chat != NULL);
    g_return_if_fail (new_word != NULL);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));

    gtk_text_buffer_delete (buffer, &start, &end);
    gtk_text_buffer_insert (buffer, &start,
                new_word,
                -1);
}

const gchar *
empathy_chat_get_name (EmpathyChat *chat)
{
    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), NULL);

    if (EMPATHY_CHAT_GET_CLASS (chat)->get_name) {
        return EMPATHY_CHAT_GET_CLASS (chat)->get_name (chat);
    }

    return NULL;
}

gchar *
empathy_chat_get_tooltip (EmpathyChat *chat)
{
    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), NULL);

    if (EMPATHY_CHAT_GET_CLASS (chat)->get_tooltip) {
        return EMPATHY_CHAT_GET_CLASS (chat)->get_tooltip (chat);
    }

    return NULL;
}

const gchar *
empathy_chat_get_status_icon_name (EmpathyChat *chat)
{
    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), NULL);

    if (EMPATHY_CHAT_GET_CLASS (chat)->get_status_icon_name) {
        return EMPATHY_CHAT_GET_CLASS (chat)->get_status_icon_name (chat);
    }

    return NULL;
}

GtkWidget *
empathy_chat_get_widget (EmpathyChat *chat)
{
    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), NULL);

    if (EMPATHY_CHAT_GET_CLASS (chat)->get_widget) {
        return EMPATHY_CHAT_GET_CLASS (chat)->get_widget (chat);
    }

    return NULL;
}

gboolean
empathy_chat_is_group_chat (EmpathyChat *chat)
{
    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), FALSE);

    if (EMPATHY_CHAT_GET_CLASS (chat)->is_group_chat) {
        return EMPATHY_CHAT_GET_CLASS (chat)->is_group_chat (chat);
    }

    return FALSE;
}

gboolean 
empathy_chat_is_connected (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), FALSE);

    priv = GET_PRIV (chat);

    return (priv->tp_chat != NULL);
}

void
empathy_chat_save_geometry (EmpathyChat *chat,
               gint        x,
               gint        y,
               gint        w,
               gint        h)
{
    empathy_geometry_save (empathy_chat_get_id (chat), x, y, w, h);
}

void
empathy_chat_load_geometry (EmpathyChat *chat,
               gint       *x,
               gint       *y,
               gint       *w,
               gint       *h)
{
    empathy_geometry_load (empathy_chat_get_id (chat), x, y, w, h);
}

void
empathy_chat_set_tp_chat (EmpathyChat   *chat,
              EmpathyTpChat *tp_chat)
{
    EmpathyChatPriv *priv;
    GList           *messages, *l;

    g_return_if_fail (EMPATHY_IS_CHAT (chat));
    g_return_if_fail (EMPATHY_IS_TP_CHAT (tp_chat));

    priv = GET_PRIV (chat);

    if (tp_chat == priv->tp_chat) {
        return;
    }

    if (priv->tp_chat) {
        g_signal_handlers_disconnect_by_func (priv->tp_chat,
                              chat_message_received_cb,
                              chat);
        g_signal_handlers_disconnect_by_func (priv->tp_chat,
                              chat_send_error_cb,
                              chat);
        g_signal_handlers_disconnect_by_func (priv->tp_chat,
                              chat_destroy_cb,
                              chat);
        g_object_unref (priv->tp_chat);
    }

    g_free (priv->id);
    priv->tp_chat = g_object_ref (tp_chat);
    priv->id = g_strdup (empathy_tp_chat_get_id (tp_chat));

    if (priv->first_tp_chat) {
        chat_add_logs (chat);
        priv->first_tp_chat = FALSE;
    }

    g_signal_connect (tp_chat, "message-received",
              G_CALLBACK (chat_message_received_cb),
              chat);
    g_signal_connect (tp_chat, "send-error",
              G_CALLBACK (chat_send_error_cb),
              chat);
    g_signal_connect (tp_chat, "chat-state-changed",
              G_CALLBACK (chat_state_changed_cb),
              chat);
    g_signal_connect (tp_chat, "destroy",
              G_CALLBACK (chat_destroy_cb),
              chat);

    /* Get pending messages */
    empathy_tp_chat_set_acknowledge (tp_chat, TRUE);
    messages = empathy_tp_chat_get_pendings (tp_chat);
    for (l = messages; l; l = l->next) {
        chat_message_received_cb (tp_chat, l->data, chat);
        g_object_unref (l->data);
    }
    g_list_free (messages);

    if (!priv->sensitive) {
        gtk_widget_set_sensitive (chat->input_text_view, TRUE);
        empathy_chat_view_append_event (chat->view, _("Connected"));
        priv->sensitive = TRUE;
    }

    if (EMPATHY_CHAT_GET_CLASS (chat)->set_tp_chat) {
        EMPATHY_CHAT_GET_CLASS (chat)->set_tp_chat (chat, tp_chat);
    }

}

const gchar *
empathy_chat_get_id (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    return priv->id;
}

void
empathy_chat_clear (EmpathyChat *chat)
{
    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    empathy_chat_view_clear (chat->view);
}

void
empathy_chat_set_window (EmpathyChat       *chat,
            EmpathyChatWindow *window)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);
    priv->window = window;
}

EmpathyChatWindow *
empathy_chat_get_window (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    priv = GET_PRIV (chat);

    return priv->window;
}

void
empathy_chat_scroll_down (EmpathyChat *chat)
{
    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    empathy_chat_view_scroll_down (chat->view);
}

void
empathy_chat_cut (EmpathyChat *chat)
{
    GtkTextBuffer *buffer;

    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));
    if (gtk_text_buffer_get_selection_bounds (buffer, NULL, NULL)) {
        GtkClipboard *clipboard;

        clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);

        gtk_text_buffer_cut_clipboard (buffer, clipboard, TRUE);
    }
}

void
empathy_chat_copy (EmpathyChat *chat)
{
    GtkTextBuffer *buffer;

    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    if (empathy_chat_view_get_selection_bounds (chat->view, NULL, NULL)) {
        empathy_chat_view_copy_clipboard (chat->view);
        return;
    }

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));
    if (gtk_text_buffer_get_selection_bounds (buffer, NULL, NULL)) {
        GtkClipboard *clipboard;

        clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);

        gtk_text_buffer_copy_clipboard (buffer, clipboard);
    }
}

void
empathy_chat_paste (EmpathyChat *chat)
{
    GtkTextBuffer *buffer;
    GtkClipboard  *clipboard;

    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (chat->input_text_view));
    clipboard = gtk_clipboard_get (GDK_SELECTION_CLIPBOARD);

    gtk_text_buffer_paste_clipboard (buffer, clipboard, NULL, TRUE);
}

void
empathy_chat_present (EmpathyChat *chat)
{
    EmpathyChatPriv *priv;

    g_return_if_fail (EMPATHY_IS_CHAT (chat));

    priv = GET_PRIV (chat);

    if (priv->window == NULL) {
        EmpathyChatWindow *window;

        window = empathy_chat_window_get_default ();
        if (!window) {
            window = empathy_chat_window_new ();
        }

        empathy_chat_window_add_chat (window, chat);
    }

    empathy_chat_window_switch_to_chat (priv->window, chat);
    empathy_window_present (
        GTK_WINDOW (empathy_chat_window_get_dialog (priv->window)),
        TRUE);

    gtk_widget_grab_focus (chat->input_text_view); 
}

gboolean
empathy_chat_should_play_sound (EmpathyChat *chat)
{
    EmpathyChatWindow *window;
    gboolean          play = TRUE;

    g_return_val_if_fail (EMPATHY_IS_CHAT (chat), FALSE);

    window = empathy_chat_get_window (chat);
    if (!window) {
        return TRUE;
    }

    play = !empathy_chat_window_has_focus (window);

    return play;
}

gboolean
empathy_chat_should_highlight_nick (EmpathyMessage *message)
{
    EmpathyContact *contact;
    const gchar   *msg, *to;
    gchar         *cf_msg, *cf_to;
    gchar         *ch;
    gboolean       ret_val;

    g_return_val_if_fail (EMPATHY_IS_MESSAGE (message), FALSE);

    empathy_debug (DEBUG_DOMAIN, "Highlighting nickname");

    ret_val = FALSE;

    msg = empathy_message_get_body (message);
    if (!msg) {
        return FALSE;
    }

    contact = empathy_message_get_receiver (message);
    if (!contact || !empathy_contact_is_user (contact)) {
        return FALSE;
    }

    to = empathy_contact_get_name (contact);
    if (!to) {
        return FALSE;
    }

    cf_msg = g_utf8_casefold (msg, -1);
    cf_to = g_utf8_casefold (to, -1);

    ch = strstr (cf_msg, cf_to);
    if (ch == NULL) {
        goto finished;
    }

    if (ch != cf_msg) {
        /* Not first in the message */
        if ((*(ch - 1) != ' ') &&
            (*(ch - 1) != ',') &&
            (*(ch - 1) != '.')) {
            goto finished;
        }
    }

    ch = ch + strlen (cf_to);
    if (ch >= cf_msg + strlen (cf_msg)) {
        ret_val = TRUE;
        goto finished;
    }

    if ((*ch == ' ') ||
        (*ch == ',') ||
        (*ch == '.') ||
        (*ch == ':')) {
        ret_val = TRUE;
        goto finished;
    }

finished:
    g_free (cf_msg);
    g_free (cf_to);

    return ret_val;
}