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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2005-2007 Imendio AB
 *
 * 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: Richard Hult <richard@imendio.com>
 */

#include "config.h"

#include <string.h>

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

#include <libempathy/empathy-conf.h>
#include <libempathy/empathy-utils.h>

#include "empathy-chat-view.h"
#include "empathy-preferences.h"
#include "empathy-theme-manager.h"

#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), EMPATHY_TYPE_THEME_MANAGER, EmpathyThemeManagerPriv))

typedef struct {
    gchar    *name;
    guint     name_notify_id;
    guint     room_notify_id;

    gboolean  show_avatars;
    guint     show_avatars_notify_id;

    gboolean  irc_style;
} EmpathyThemeManagerPriv;

static void        theme_manager_finalize                 (GObject            *object);
static void        theme_manager_notify_name_cb           (EmpathyConf         *conf,
                               const gchar        *key,
                               gpointer            user_data);
static void        theme_manager_notify_room_cb           (EmpathyConf         *conf,
                               const gchar        *key,
                               gpointer            user_data);
static void        theme_manager_notify_show_avatars_cb   (EmpathyConf         *conf,
                               const gchar        *key,
                               gpointer            user_data);
static void        theme_manager_ensure_tag_by_name       (GtkTextBuffer      *buffer,
                               const gchar        *name);
static gboolean    theme_manager_ensure_theme_exists      (const gchar        *name);
static GtkTextTag *theme_manager_init_tag_by_name         (GtkTextTagTable    *table,
                               const gchar        *name);
static void        theme_manager_add_tag                  (GtkTextTagTable    *table,
                               GtkTextTag         *tag);
static void        theme_manager_fixup_tag_table          (EmpathyThemeManager *theme_manager,
                               EmpathyChatView     *view);
static void        theme_manager_apply_theme_classic      (EmpathyThemeManager *manager,
                               EmpathyChatView     *view);
static void        theme_manager_apply_theme_clean        (EmpathyThemeManager *manager,
                               EmpathyChatView     *view);
static void        theme_manager_apply_theme_blue         (EmpathyThemeManager *manager,
                               EmpathyChatView     *view);
static void        theme_manager_apply_theme              (EmpathyThemeManager *manager,
                               EmpathyChatView     *view,
                               const gchar        *name);

enum {
    THEME_CHANGED,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

static const gchar *themes[] = {
    "classic", N_("Classic"),
    "simple", N_("Simple"),
    "clean", N_("Clean"),
    "blue", N_("Blue"),
    NULL
};

G_DEFINE_TYPE (EmpathyThemeManager, empathy_theme_manager, G_TYPE_OBJECT);

static void
empathy_theme_manager_class_init (EmpathyThemeManagerClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    signals[THEME_CHANGED] =
        g_signal_new ("theme-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 (EmpathyThemeManagerPriv));

    object_class->finalize = theme_manager_finalize;
}

static void
empathy_theme_manager_init (EmpathyThemeManager *manager)
{
    EmpathyThemeManagerPriv *priv;

    priv = GET_PRIV (manager);

    priv->name_notify_id =
        empathy_conf_notify_add (empathy_conf_get (),
                    EMPATHY_PREFS_CHAT_THEME,
                    theme_manager_notify_name_cb,
                    manager);

    priv->room_notify_id =
        empathy_conf_notify_add (empathy_conf_get (),
                    EMPATHY_PREFS_CHAT_THEME_CHAT_ROOM,
                    theme_manager_notify_room_cb,
                    manager);

    empathy_conf_get_string (empathy_conf_get (),
                EMPATHY_PREFS_CHAT_THEME,
                &priv->name);

    /* Unused right now, but will be used soon. */
    priv->show_avatars_notify_id =
        empathy_conf_notify_add (empathy_conf_get (),
                    EMPATHY_PREFS_UI_SHOW_AVATARS,
                    theme_manager_notify_show_avatars_cb,
                    manager);

    empathy_conf_get_bool (empathy_conf_get (),
                  EMPATHY_PREFS_UI_SHOW_AVATARS,
                  &priv->show_avatars);
}

static void
theme_manager_finalize (GObject *object)
{
    EmpathyThemeManagerPriv *priv;

    priv = GET_PRIV (object);

    empathy_conf_notify_remove (empathy_conf_get (), priv->name_notify_id);
    empathy_conf_notify_remove (empathy_conf_get (), priv->room_notify_id);
    empathy_conf_notify_remove (empathy_conf_get (), priv->show_avatars_notify_id);

    g_free (priv->name);

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

static void
theme_manager_notify_name_cb (EmpathyConf  *conf,
                  const gchar *key,
                  gpointer     user_data)
{
    EmpathyThemeManager     *manager;
    EmpathyThemeManagerPriv *priv;
    gchar                  *name;

    manager = user_data;
    priv = GET_PRIV (manager);

    g_free (priv->name);

    name = NULL;
    if (!empathy_conf_get_string (conf, key, &name) ||
        name == NULL || name[0] == 0) {
        priv->name = g_strdup ("classic");
        g_free (name);
    } else {
        priv->name = name;
    }

    g_signal_emit (manager, signals[THEME_CHANGED], 0, NULL);
}

static void
theme_manager_notify_room_cb (EmpathyConf  *conf,
                  const gchar *key,
                  gpointer     user_data)
{
    g_signal_emit (user_data, signals[THEME_CHANGED], 0, NULL);
}

static void
theme_manager_notify_show_avatars_cb (EmpathyConf  *conf,
                      const gchar *key,
                      gpointer     user_data)
{
    EmpathyThemeManager     *manager;
    EmpathyThemeManagerPriv *priv;
    gboolean                value;

    manager = user_data;
    priv = GET_PRIV (manager);

    if (!empathy_conf_get_bool (conf, key, &value)) {
        priv->show_avatars = FALSE;
    } else {
        priv->show_avatars = value;
    }
}

static void
theme_manager_ensure_tag_by_name (GtkTextBuffer *buffer,
                  const gchar   *name)
{
    GtkTextTagTable *table;
    GtkTextTag      *tag;

    table = gtk_text_buffer_get_tag_table (buffer);
    tag = gtk_text_tag_table_lookup (table, name);

    if (!tag) {
        gtk_text_buffer_create_tag (buffer,
                        name,
                        NULL);
    }
}

static gboolean
theme_manager_ensure_theme_exists (const gchar *name)
{
    gint i;

    if (G_STR_EMPTY (name)) {
        return FALSE;
    }

    for (i = 0; themes[i]; i += 2) {
        if (strcmp (themes[i], name) == 0) {
            return TRUE;
        }
    }

    return FALSE;
}

static GtkTextTag *
theme_manager_init_tag_by_name (GtkTextTagTable *table,
                const gchar     *name)
{
    GtkTextTag *tag;

    tag = gtk_text_tag_table_lookup (table, name);

    if (!tag) {
        return gtk_text_tag_new (name);
    }

    /* Clear the old values so that we don't affect the new theme. */
    g_object_set (tag,
              "background-set", FALSE,
              "foreground-set", FALSE,
              "invisible-set", FALSE,
              "justification-set", FALSE,
              "paragraph-background-set", FALSE,
              "pixels-above-lines-set", FALSE,
              "pixels-below-lines-set", FALSE,
              "rise-set", FALSE,
              "scale-set", FALSE,
              "size-set", FALSE,
              "style-set", FALSE,
              "weight-set", FALSE,
              NULL);

    return tag;
}

static void
theme_manager_add_tag (GtkTextTagTable *table,
               GtkTextTag      *tag)
{
    gchar      *name;
    GtkTextTag *check_tag;

    g_object_get (tag, "name", &name, NULL);
    check_tag = gtk_text_tag_table_lookup (table, name);
    g_free (name);
    if (check_tag) {
        return;
    }

    gtk_text_tag_table_add (table, tag);

    g_object_unref (tag);
}

static void
theme_manager_fixup_tag_table (EmpathyThemeManager *theme_manager,
                   EmpathyChatView     *view)
{
    GtkTextBuffer *buffer;

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));

    /* "Fancy" style tags. */
    theme_manager_ensure_tag_by_name (buffer, "fancy-header-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-header-self-avatar");
    theme_manager_ensure_tag_by_name (buffer, "fancy-avatar-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-line-top-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-line-bottom-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-body-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-action-self");
    theme_manager_ensure_tag_by_name (buffer, "fancy-highlight-self");

    theme_manager_ensure_tag_by_name (buffer, "fancy-header-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-header-other-avatar");
    theme_manager_ensure_tag_by_name (buffer, "fancy-avatar-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-line-top-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-line-bottom-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-body-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-action-other");
    theme_manager_ensure_tag_by_name (buffer, "fancy-highlight-other");

    theme_manager_ensure_tag_by_name (buffer, "fancy-spacing");
    theme_manager_ensure_tag_by_name (buffer, "fancy-time");
    theme_manager_ensure_tag_by_name (buffer, "fancy-event");
    theme_manager_ensure_tag_by_name (buffer, "fancy-invite");
    theme_manager_ensure_tag_by_name (buffer, "fancy-link");

    /* IRC style tags. */
    theme_manager_ensure_tag_by_name (buffer, "irc-nick-self");
    theme_manager_ensure_tag_by_name (buffer, "irc-body-self");
    theme_manager_ensure_tag_by_name (buffer, "irc-action-self");

    theme_manager_ensure_tag_by_name (buffer, "irc-nick-other");
    theme_manager_ensure_tag_by_name (buffer, "irc-body-other");
    theme_manager_ensure_tag_by_name (buffer, "irc-action-other");

    theme_manager_ensure_tag_by_name (buffer, "irc-nick-highlight");
    theme_manager_ensure_tag_by_name (buffer, "irc-spacing");
    theme_manager_ensure_tag_by_name (buffer, "irc-time");
    theme_manager_ensure_tag_by_name (buffer, "irc-event");
    theme_manager_ensure_tag_by_name (buffer, "irc-invite");
    theme_manager_ensure_tag_by_name (buffer, "irc-link");
}

static void
theme_manager_apply_theme_classic (EmpathyThemeManager *manager,
                   EmpathyChatView     *view)
{
    EmpathyThemeManagerPriv *priv;
    GtkTextBuffer          *buffer;
    GtkTextTagTable        *table;
    GtkTextTag             *tag;

    priv = GET_PRIV (manager);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
    table = gtk_text_buffer_get_tag_table (buffer);

    priv->irc_style = TRUE;

    tag = theme_manager_init_tag_by_name (table, "irc-spacing");
    g_object_set (tag,
              "size", 2000,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-nick-self");
    g_object_set (tag,
              "foreground", "sea green",
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-body-self");
    g_object_set (tag,
              /* To get the default theme color: */
              "foreground-set", FALSE,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-action-self");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-nick-highlight");
    g_object_set (tag,
              "foreground", "indian red",
              "weight", PANGO_WEIGHT_BOLD,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-nick-other");
    g_object_set (tag,
              "foreground", "skyblue4",
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-body-other");
    g_object_set (tag,
              /* To get the default theme color: */
              "foreground-set", FALSE,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-action-other");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-time");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_CENTER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-event");
    g_object_set (tag,
              "foreground", "PeachPuff4",
              "justification", GTK_JUSTIFY_LEFT,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-invite");
    g_object_set (tag,
              "foreground", "sienna",
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "irc-link");
    g_object_set (tag,
              "foreground", "steelblue",
              "underline", PANGO_UNDERLINE_SINGLE,
              NULL);
    theme_manager_add_tag (table, tag);
}

static void
theme_manager_apply_theme_simple (EmpathyThemeManager *manager,
                  EmpathyChatView     *view)
{
    EmpathyThemeManagerPriv *priv;
    GtkTextBuffer          *buffer;
    GtkTextTagTable        *table;
    GtkTextTag             *tag;
    GtkWidget              *widget;
    GtkStyle               *style;

    priv = GET_PRIV (manager);

    widget = gtk_entry_new ();
    style = gtk_widget_get_style (widget);
    gtk_widget_destroy (widget);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
    table = gtk_text_buffer_get_tag_table (buffer);

    priv->irc_style = FALSE;

    tag = theme_manager_init_tag_by_name (table, "fancy-spacing");
    g_object_set (tag,
              "size", 3000,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-self");
    g_object_set (tag,
              "weight", PANGO_WEIGHT_BOLD,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-self-avatar");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-self");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-self");
    g_object_set (tag,
              "size", 6 * PANGO_SCALE,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-self");
    g_object_set (tag,
              "size", 1,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-body-self");
    g_object_set (tag,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-self");
    g_object_set (tag,
              "foreground-gdk", &style->base[GTK_STATE_SELECTED],
              "style", PANGO_STYLE_ITALIC,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-highlight-self");
    g_object_set (tag,
              "weight", PANGO_WEIGHT_BOLD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-other");
    g_object_set (tag,
              "weight", PANGO_WEIGHT_BOLD,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-other-avatar");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-other");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-other");
    g_object_set (tag,
              "size", 6 * PANGO_SCALE,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-other");
    g_object_set (tag,
              "size", 1,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-body-other");
    g_object_set (tag,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-other");
    g_object_set (tag,
              "foreground-gdk", &style->base[GTK_STATE_SELECTED],
              "style", PANGO_STYLE_ITALIC,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-highlight-other");
    g_object_set (tag,
              "weight", PANGO_WEIGHT_BOLD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-time");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_CENTER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-event");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_LEFT,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-invite");
    g_object_set (tag,
              "foreground", "darkgrey",
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-link");
    g_object_set (tag,
              "foreground-gdk", &style->base[GTK_STATE_SELECTED],
              "underline", PANGO_UNDERLINE_SINGLE,
              NULL);
    theme_manager_add_tag (table, tag);
}

static void
theme_manager_apply_theme_clean (EmpathyThemeManager *manager,
                 EmpathyChatView     *view)
{
    EmpathyThemeManagerPriv *priv;
    GtkTextBuffer          *buffer;
    GtkTextTagTable        *table;
    GtkTextTag             *tag;

    priv = GET_PRIV (manager);

    /* Inherit the simple theme. */
    theme_manager_apply_theme_simple (manager, view);

#define ELEGANT_HEAD "#efefdf"
#define ELEGANT_LINE "#e3e3d3"

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
    table = gtk_text_buffer_get_tag_table (buffer);

    tag = theme_manager_init_tag_by_name (table, "fancy-spacing");
    g_object_set (tag,
              "size", PANGO_SCALE * 10,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-self");
    g_object_set (tag,
              "foreground", "black",
              "weight", PANGO_WEIGHT_BOLD,
              "paragraph-background", ELEGANT_HEAD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-self");
    g_object_set (tag,
              "paragraph-background", ELEGANT_HEAD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-self");
    g_object_set (tag,
              "size", 1 * PANGO_SCALE,
              "paragraph-background", ELEGANT_LINE,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-self");
    g_object_set (tag,
              "size", 1 * PANGO_SCALE,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-self");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-highlight-self");
    g_object_set (tag,
              "foreground", "black",
              "weight", PANGO_WEIGHT_BOLD,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-other");
    g_object_set (tag,
              "foreground", "black",
              "weight", PANGO_WEIGHT_BOLD,
              "paragraph-background", ELEGANT_HEAD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-other");
    g_object_set (tag,
              "paragraph-background", ELEGANT_HEAD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-other");
    g_object_set (tag,
              "size", 1 * PANGO_SCALE,
              "paragraph-background", ELEGANT_LINE,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-other");
    g_object_set (tag,
              "size", 1 * PANGO_SCALE,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-other");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-time");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_CENTER,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-event");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_LEFT,
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-invite");
    g_object_set (tag,
              "foreground", "sienna",
              NULL);

    tag = theme_manager_init_tag_by_name (table, "fancy-link");
    g_object_set (tag,
              "foreground", "#49789e",
              "underline", PANGO_UNDERLINE_SINGLE,
              NULL);
}

static void
theme_manager_apply_theme_blue (EmpathyThemeManager *manager,
                EmpathyChatView     *view)
{
    EmpathyThemeManagerPriv *priv;
    GtkTextBuffer          *buffer;
    GtkTextTagTable        *table;
    GtkTextTag             *tag;

    priv = GET_PRIV (manager);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
    table = gtk_text_buffer_get_tag_table (buffer);

    priv->irc_style = FALSE;

#define BLUE_BODY_SELF "#dcdcdc"
#define BLUE_HEAD_SELF "#b9b9b9"
#define BLUE_LINE_SELF "#aeaeae"

#define BLUE_BODY_OTHER "#adbdc8"
#define BLUE_HEAD_OTHER "#88a2b4"
#define BLUE_LINE_OTHER "#7f96a4"

    tag = theme_manager_init_tag_by_name (table, "fancy-spacing");
    g_object_set (tag,
              "size", 3000,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-self");
    g_object_set (tag,
              "foreground", "black",
              "paragraph-background", BLUE_HEAD_SELF,
              "weight", PANGO_WEIGHT_BOLD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-self-avatar");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-self");
    g_object_set (tag,
              "paragraph-background", BLUE_HEAD_SELF,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-self");
    g_object_set (tag,
              "size", 1,
              "paragraph-background", BLUE_LINE_SELF,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-self");
    g_object_set (tag,
              "size", 1,
              "paragraph-background", BLUE_LINE_SELF,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-body-self");
    g_object_set (tag,
              "foreground", "black",
              "paragraph-background", BLUE_BODY_SELF,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-self");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              "paragraph-background", BLUE_BODY_SELF,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-highlight-self");
    g_object_set (tag,
              "foreground", "black",
              "weight", PANGO_WEIGHT_BOLD,
              "paragraph-background", BLUE_BODY_SELF,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-other");
    g_object_set (tag,
              "foreground", "black",
              "paragraph-background", BLUE_HEAD_OTHER,
              "weight", PANGO_WEIGHT_BOLD,
              "pixels-above-lines", 2,
              "pixels-below-lines", 2,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-header-other-avatar");
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-avatar-other");
    g_object_set (tag,
              "paragraph-background", BLUE_HEAD_OTHER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-top-other");
    g_object_set (tag,
              "size", 1,
              "paragraph-background", BLUE_LINE_OTHER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-line-bottom-other");
    g_object_set (tag,
              "size", 1,
              "paragraph-background", BLUE_LINE_OTHER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-body-other");
    g_object_set (tag,
              "foreground", "black",
              "paragraph-background", BLUE_BODY_OTHER,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-action-other");
    g_object_set (tag,
              "foreground", "brown4",
              "style", PANGO_STYLE_ITALIC,
              "paragraph-background", BLUE_BODY_OTHER,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-highlight-other");
    g_object_set (tag,
              "foreground", "black",
              "weight", PANGO_WEIGHT_BOLD,
              "paragraph-background", BLUE_BODY_OTHER,
              "pixels-above-lines", 4,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-time");
    g_object_set (tag,
              "foreground", "darkgrey",
              "justification", GTK_JUSTIFY_CENTER,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-event");
    g_object_set (tag,
              "foreground", BLUE_LINE_OTHER,
              "justification", GTK_JUSTIFY_LEFT,
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-invite");
    g_object_set (tag,
              "foreground", "sienna",
              NULL);
    theme_manager_add_tag (table, tag);

    tag = theme_manager_init_tag_by_name (table, "fancy-link");
    g_object_set (tag,
              "foreground", "#49789e",
              "underline", PANGO_UNDERLINE_SINGLE,
              NULL);
    theme_manager_add_tag (table, tag);
}

static void
theme_manager_apply_theme (EmpathyThemeManager *manager,
               EmpathyChatView     *view,
               const gchar        *name)
{
    EmpathyThemeManagerPriv *priv;
    gint                    margin;

    priv = GET_PRIV (manager);

    /* Make sure all tags are present. Note: not useful now but when we have
     * user defined theme it will be.
     */
    theme_manager_fixup_tag_table (manager, view);

    if (theme_manager_ensure_theme_exists (name)) {
        if (strcmp (name, "clean") == 0) {
            theme_manager_apply_theme_clean (manager, view);
            margin = 3;
        }
        else if (strcmp (name, "simple") == 0) {
            theme_manager_apply_theme_simple (manager, view);
            margin = 3;
        }
        else if (strcmp (name, "blue") == 0) {
            theme_manager_apply_theme_blue (manager, view);
            margin = 0;
        } else {
            theme_manager_apply_theme_classic (manager, view);
            margin = 3;
        }
    } else {
        theme_manager_apply_theme_classic (manager, view);
        margin = 3;
    }

    empathy_chat_view_set_margin (view, margin);
    empathy_chat_view_set_irc_style (view, priv->irc_style);
}

EmpathyThemeManager *
empathy_theme_manager_get (void)
{
    static EmpathyThemeManager *manager = NULL;

    if (!manager) {
        manager = g_object_new (EMPATHY_TYPE_THEME_MANAGER, NULL);
    }

    return manager;
}

const gchar **
empathy_theme_manager_get_themes (void)
{
    return themes;
}

void
empathy_theme_manager_apply (EmpathyThemeManager *manager,
                EmpathyChatView     *view,
                const gchar        *name)
{
    EmpathyThemeManagerPriv *priv;

    priv = GET_PRIV (manager);

    theme_manager_apply_theme (manager, view, name);
}

void
empathy_theme_manager_apply_saved (EmpathyThemeManager *manager,
                  EmpathyChatView     *view)
{
    EmpathyThemeManagerPriv *priv;

    priv = GET_PRIV (manager);

    theme_manager_apply_theme (manager, view, priv->name);
}

/* FIXME: A bit ugly. We should probably change the scheme so that instead of
 * the manager signalling, views are registered and applied to automatically.
 */
void
empathy_theme_manager_update_show_avatars (EmpathyThemeManager *manager,
                      EmpathyChatView     *view,
                      gboolean            show)
{
    EmpathyThemeManagerPriv *priv;
    GtkTextBuffer          *buffer;
    GtkTextTagTable        *table;
    GtkTextTag             *tag_text_self, *tag_text_other;
    GtkTextTag             *tag_image_self, *tag_image_other;

    priv = GET_PRIV (manager);

    buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (view));
    table = gtk_text_buffer_get_tag_table (buffer);

    tag_text_self = gtk_text_tag_table_lookup (table, "fancy-header-self-avatar");
    tag_text_other = gtk_text_tag_table_lookup (table, "fancy-header-other-avatar");

    tag_image_self = gtk_text_tag_table_lookup (table, "fancy-avatar-self");
    tag_image_other = gtk_text_tag_table_lookup (table, "fancy-avatar-other");

    if (!show) {
        g_object_set (tag_text_self,
                  "rise", 0,
                  NULL);
        g_object_set (tag_text_other,
                  "rise", 0,
                  NULL);
        g_object_set (tag_image_self,
                  "invisible", TRUE,
                  NULL);
        g_object_set (tag_image_other,
                  "invisible", TRUE,
                  NULL);
    } else {
        GtkTextAttributes *attrs;
        gint               size;
        gint               rise;

        attrs = gtk_text_view_get_default_attributes (GTK_TEXT_VIEW (view));
        size = pango_font_description_get_size (attrs->font);
        rise = MAX (0, (32 * PANGO_SCALE - size) / 2.0);

        g_object_set (tag_text_self,
                  "rise", rise,
                  NULL);
        g_object_set (tag_text_other,
                  "rise", rise,
                  NULL);
        g_object_set (tag_image_self,
                  "invisible", FALSE,
                  NULL);
        g_object_set (tag_image_other,
                  "invisible", FALSE,
                  NULL);

        gtk_text_attributes_unref (attrs);
    }
}