/*
 * Copyright (C) 2007 The GNOME Foundation
 * Written by Thomas Wood <thos@gnome.org>
 *            Jens Granseuer <jensgr@gmx.net>
 * All Rights Reserved
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "appearance.h"
#include "theme-thumbnail.h"
#include "gnome-theme-apply.h"
#include "theme-installer.h"
#include "theme-save.h"
#include "theme-util.h"
#include "gtkrc-utils.h"
#include "gedit-message-area.h"
#include "wp-cellrenderer.h"
#include "caption-cellrenderer.h"

#include <glib/gi18n.h>
#include <libwindow-settings/gnome-wm-manager.h>
#include <string.h>
#include <libgnomeui/gnome-desktop-thumbnail.h>

#define CUSTOM_THEME_NAME "__custom__"

enum
{
  RESPONSE_APPLY_BG,
  RESPONSE_REVERT_FONT,
  RESPONSE_APPLY_FONT,
  RESPONSE_INSTALL_ENGINE
};

enum
{
  TARGET_URI_LIST,
  TARGET_NS_URL
};

static const GtkTargetEntry drop_types[] =
{
  {"text/uri-list", 0, TARGET_URI_LIST},
  {"_NETSCAPE_URL", 0, TARGET_NS_URL}
};

static void theme_message_area_update (AppearanceData *data);

static time_t
theme_get_mtime (const char *name)
{
  GnomeThemeMetaInfo *theme;
  time_t mtime = -1;

  theme = gnome_theme_meta_info_find (name);
  if (theme != NULL) {
    GFile *file;
    GFileInfo *file_info;

    file = g_file_new_for_path (theme->path);
    file_info = g_file_query_info (file,
                                   G_FILE_ATTRIBUTE_TIME_MODIFIED,
                                   G_FILE_QUERY_INFO_NONE,
                                   NULL, NULL);
    g_object_unref (file);

    if (file_info != NULL) {
      mtime = g_file_info_get_attribute_uint64 (file_info,
                                                G_FILE_ATTRIBUTE_TIME_MODIFIED);
      g_object_unref (file_info);
    }
  }

  return mtime;
}

static void
theme_thumbnail_update (GdkPixbuf *pixbuf,
			gchar *theme_name,
			AppearanceData *data,
			gboolean cache)
{
  GtkTreeIter iter;
  GtkTreeModel *model = GTK_TREE_MODEL (data->theme_store);

  /* find item in model and update thumbnail */
  if (!pixbuf)
    return;

  if (theme_find_in_model (model, theme_name, &iter)) {
    time_t mtime;

    gtk_list_store_set (data->theme_store, &iter, COL_THUMBNAIL, pixbuf, -1);

    /* cache thumbnail */
    if (cache && (mtime = theme_get_mtime (theme_name)) != -1) {
      gchar *path;

      /* try to share thumbs with nautilus, use themes:/// */
      path = g_strconcat ("themes:///", theme_name, NULL);

      gnome_desktop_thumbnail_factory_save_thumbnail (data->thumb_factory,
						      pixbuf, path, mtime);

      g_free (path);
    }
  }
}

static GdkPixbuf *
theme_get_thumbnail_from_cache (GnomeThemeMetaInfo *info, AppearanceData *data)
{
  GdkPixbuf *thumb = NULL;
  gchar *path, *thumb_filename;
  time_t mtime;

  if (info == data->theme_custom)
    return NULL;

  mtime = theme_get_mtime (info->name);
  if (mtime == -1)
    return NULL;

  /* try to share thumbs with nautilus, use themes:/// */
  path = g_strconcat ("themes:///", info->name, NULL);
  thumb_filename = gnome_desktop_thumbnail_factory_lookup (data->thumb_factory,
							   path, mtime);
  g_free (path);

  if (thumb_filename != NULL) {
    thumb = gdk_pixbuf_new_from_file (thumb_filename, NULL);
    g_free (thumb_filename);
  }

  return thumb;
}

static void
theme_thumbnail_done_cb (GdkPixbuf *pixbuf, gchar *theme_name, AppearanceData *data)
{
  theme_thumbnail_update (pixbuf, theme_name, data, TRUE);
}

static void
theme_thumbnail_generate (GnomeThemeMetaInfo *info, AppearanceData *data)
{
  GdkPixbuf *thumb;

  thumb = theme_get_thumbnail_from_cache (info, data);

  if (thumb != NULL) {
    theme_thumbnail_update (thumb, info->name, data, FALSE);
    g_object_unref (thumb);
  } else
    generate_meta_theme_thumbnail_async (info,
        (ThemeThumbnailFunc) theme_thumbnail_done_cb, data, NULL);
}

static void
theme_changed_on_disk_cb (GnomeThemeCommonInfo *theme,
			  GnomeThemeChangeType  change_type,
                          GnomeThemeElement     element_type,
			  AppearanceData       *data)
{
  if (theme->type == GNOME_THEME_TYPE_METATHEME) {
    GnomeThemeMetaInfo *meta = (GnomeThemeMetaInfo *) theme;

    if (change_type == GNOME_THEME_CHANGE_CREATED) {
      gtk_list_store_insert_with_values (data->theme_store, NULL, 0,
          COL_LABEL, meta->readable_name,
          COL_NAME, meta->name,
          COL_THUMBNAIL, data->theme_icon,
          -1);
      theme_thumbnail_generate (meta, data);

    } else if (change_type == GNOME_THEME_CHANGE_DELETED) {
      GtkTreeIter iter;

      if (theme_find_in_model (GTK_TREE_MODEL (data->theme_store), meta->name, &iter))
        gtk_list_store_remove (data->theme_store, &iter);

    } else if (change_type == GNOME_THEME_CHANGE_CHANGED) {
      theme_thumbnail_generate (meta, data);
    }
  }
}

static gchar *
get_default_string_from_key (GConfClient *client, const char *key)
{
  GConfValue *value;
  gchar *str = NULL;

  value = gconf_client_get_default_from_schema (client, key, NULL);

  if (value) {
    if (value->type == GCONF_VALUE_STRING)
      str = gconf_value_to_string (value);
    gconf_value_free (value);
  }

  return str;
}

/* Find out if the lockdown key has been set. Currently returns false on error... */
static gboolean
is_locked_down (GConfClient *client)
{
  return gconf_client_get_bool (client, LOCKDOWN_KEY, NULL);
}

static GnomeThemeMetaInfo *
theme_load_from_gconf (GConfClient *client)
{
  GnomeThemeMetaInfo *theme;
  gchar *scheme;

  theme = gnome_theme_meta_info_new ();

  theme->gtk_theme_name = gconf_client_get_string (client, GTK_THEME_KEY, NULL);
  if (theme->gtk_theme_name == NULL)
    theme->gtk_theme_name = g_strdup ("Clearlooks");

  scheme = gconf_client_get_string (client, COLOR_SCHEME_KEY, NULL);
  if (scheme == NULL || !strcmp (scheme, "")) {
    g_free (scheme);
    scheme = gtkrc_get_color_scheme_for_theme (theme->gtk_theme_name);
  }
  theme->gtk_color_scheme = scheme;

  theme->metacity_theme_name = gconf_client_get_string (client, METACITY_THEME_KEY, NULL);
  if (theme->metacity_theme_name == NULL)
    theme->metacity_theme_name = g_strdup ("Clearlooks");

  theme->icon_theme_name = gconf_client_get_string (client, ICON_THEME_KEY, NULL);
  if (theme->icon_theme_name == NULL)
    theme->icon_theme_name = g_strdup ("gnome");

  theme->notification_theme_name = gconf_client_get_string (client, NOTIFICATION_THEME_KEY, NULL);

  theme->cursor_theme_name = gconf_client_get_string (client, CURSOR_THEME_KEY, NULL);
#ifdef HAVE_XCURSOR
  theme->cursor_size = gconf_client_get_int (client, CURSOR_SIZE_KEY, NULL);
#endif
  if (theme->cursor_theme_name == NULL)
    theme->cursor_theme_name = g_strdup ("default");

  theme->application_font = gconf_client_get_string (client, APPLICATION_FONT_KEY, NULL);

  return theme;
}

static gchar *
theme_get_selected_name (GtkIconView *icon_view, AppearanceData *data)
{
  gchar *name = NULL;
  GList *selected = gtk_icon_view_get_selected_items (icon_view);

  if (selected) {
    GtkTreePath *path = selected->data;
    GtkTreeModel *model = gtk_icon_view_get_model (icon_view);
    GtkTreeIter iter;

    if (gtk_tree_model_get_iter (model, &iter, path))
      gtk_tree_model_get (model, &iter, COL_NAME, &name, -1);

    g_list_foreach (selected, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (selected);
  }

  return name;
}

static const GnomeThemeMetaInfo *
theme_get_selected (GtkIconView *icon_view, AppearanceData *data)
{
  GnomeThemeMetaInfo *theme = NULL;
  gchar *name = theme_get_selected_name (icon_view, data);

  if (name != NULL) {
    if (!strcmp (name, data->theme_custom->name)) {
      theme = data->theme_custom;
    } else {
      theme = gnome_theme_meta_info_find (name);
    }

    g_free (name);
  }

  return theme;
}

static void
theme_select_iter (GtkIconView *icon_view, GtkTreeIter *iter)
{
  GtkTreePath *path;

  path = gtk_tree_model_get_path (gtk_icon_view_get_model (icon_view), iter);
  gtk_icon_view_select_path (icon_view, path);
  gtk_icon_view_scroll_to_path (icon_view, path, FALSE, 0.5, 0.0);
  gtk_tree_path_free (path);
}

static void
theme_select_name (GtkIconView *icon_view, const gchar *theme)
{
  GtkTreeIter iter;
  GtkTreeModel *model = gtk_icon_view_get_model (icon_view);

  if (theme_find_in_model (model, theme, &iter))
    theme_select_iter (icon_view, &iter);
}

static gboolean
theme_is_equal (const GnomeThemeMetaInfo *a, const GnomeThemeMetaInfo *b)
{
  gboolean a_set, b_set;

  if (!(a->gtk_theme_name && b->gtk_theme_name) ||
      strcmp (a->gtk_theme_name, b->gtk_theme_name))
    return FALSE;

  if (!(a->icon_theme_name && b->icon_theme_name) ||
      strcmp (a->icon_theme_name, b->icon_theme_name))
    return FALSE;

  if (!(a->metacity_theme_name && b->metacity_theme_name) ||
      strcmp (a->metacity_theme_name, b->metacity_theme_name))
    return FALSE;

  if (!(a->cursor_theme_name && b->cursor_theme_name) ||
      strcmp (a->cursor_theme_name, b->cursor_theme_name))
    return FALSE;

  if (a->cursor_size != b->cursor_size)
    return FALSE;

  a_set = a->gtk_color_scheme && strcmp (a->gtk_color_scheme, "");
  b_set = b->gtk_color_scheme && strcmp (b->gtk_color_scheme, "");
  if ((a_set != b_set) ||
      (a_set && !gnome_theme_color_scheme_equal (a->gtk_color_scheme, b->gtk_color_scheme)))
    return FALSE;

  return TRUE;
}

static void
theme_set_custom_from_theme (const GnomeThemeMetaInfo *info, AppearanceData *data)
{
  GnomeThemeMetaInfo *custom = data->theme_custom;
  GtkIconView *icon_view = GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list"));
  GtkTreeModel *model;
  GtkTreeIter iter;
  GtkTreePath *path;

  if (info == custom)
    return;

  /* if info is not NULL, we'll copy those theme settings over */
  if (info != NULL) {
    g_free (custom->gtk_theme_name);
    g_free (custom->icon_theme_name);
    g_free (custom->metacity_theme_name);
    g_free (custom->gtk_color_scheme);
    g_free (custom->cursor_theme_name);
    g_free (custom->application_font);
    custom->gtk_color_scheme = NULL;
    custom->application_font = NULL;

    /* these settings are guaranteed to be non-NULL */
    custom->gtk_theme_name = g_strdup (info->gtk_theme_name);
    custom->icon_theme_name = g_strdup (info->icon_theme_name);
    custom->metacity_theme_name = g_strdup (info->metacity_theme_name);
    custom->cursor_theme_name = g_strdup (info->cursor_theme_name);
    custom->cursor_size = info->cursor_size;

    /* these can be NULL */
    if (info->gtk_color_scheme)
      custom->gtk_color_scheme = g_strdup (info->gtk_color_scheme);
    else
      custom->gtk_color_scheme = get_default_string_from_key (data->client, COLOR_SCHEME_KEY);

    if (info->application_font)
      custom->application_font = g_strdup (info->application_font);
    else
      custom->application_font = get_default_string_from_key (data->client, APPLICATION_FONT_KEY);
  }

  /* select the custom theme */
  model = gtk_icon_view_get_model (icon_view);
  if (!theme_find_in_model (model, custom->name, &iter)) {
    GtkTreeIter child;

    gtk_list_store_insert_with_values (data->theme_store, &child, 0,
        COL_LABEL, custom->readable_name,
        COL_NAME, custom->name,
        COL_THUMBNAIL, data->theme_icon,
        -1);
    gtk_tree_model_sort_convert_child_iter_to_iter (
        GTK_TREE_MODEL_SORT (model), &iter, &child);
  }

  path = gtk_tree_model_get_path (model, &iter);
  gtk_icon_view_select_path (icon_view, path);
  gtk_icon_view_scroll_to_path (icon_view, path, FALSE, 0.5, 0.0);
  gtk_tree_path_free (path);

  /* update the theme thumbnail */
  theme_thumbnail_generate (custom, data);
}

/** GUI Callbacks **/

static void
custom_font_cb (GtkWidget *button, AppearanceData *data)
{
  g_free (data->revert_application_font);
  g_free (data->revert_documents_font);
  g_free (data->revert_desktop_font);
  g_free (data->revert_windowtitle_font);
  g_free (data->revert_monospace_font);
  data->revert_application_font = NULL;
  data->revert_documents_font = NULL;
  data->revert_desktop_font = NULL;
  data->revert_windowtitle_font = NULL;
  data->revert_monospace_font = NULL;
}

static void
theme_message_area_response_cb (GtkWidget *w,
                                gint response_id,
                                AppearanceData *data)
{
  const GnomeThemeMetaInfo *theme;
  gchar *tmpfont;
  gchar *engine_path;

  theme = theme_get_selected (GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list")), data);
  if (!theme)
    return;

  switch (response_id)
  {
    case RESPONSE_APPLY_BG:
      gconf_client_set_string (data->client, BACKGROUND_KEY,
                               theme->background_image, NULL);
      break;

    case RESPONSE_REVERT_FONT:
      if (data->revert_application_font != NULL) {
        gconf_client_set_string (data->client, APPLICATION_FONT_KEY,
                                 data->revert_application_font, NULL);
        g_free (data->revert_application_font);
        data->revert_application_font = NULL;
      }

      if (data->revert_documents_font != NULL) {
        gconf_client_set_string (data->client, DOCUMENTS_FONT_KEY,
                                 data->revert_documents_font, NULL);
        g_free (data->revert_documents_font);
        data->revert_documents_font = NULL;
      }

      if (data->revert_desktop_font != NULL) {
        gconf_client_set_string (data->client, DESKTOP_FONT_KEY,
                                 data->revert_desktop_font, NULL);
        g_free (data->revert_desktop_font);
        data->revert_desktop_font = NULL;
      }

      if (data->revert_windowtitle_font != NULL) {
        gconf_client_set_string (data->client, WINDOWTITLE_FONT_KEY,
                                 data->revert_windowtitle_font, NULL);
        g_free (data->revert_windowtitle_font);
        data->revert_windowtitle_font = NULL;
      }

      if (data->revert_monospace_font != NULL) {
        gconf_client_set_string (data->client, MONOSPACE_FONT_KEY,
                                 data->revert_monospace_font, NULL);
        g_free (data->revert_monospace_font);
        data->revert_monospace_font = NULL;
      }
      break;

    case RESPONSE_APPLY_FONT:
      if (theme->application_font) {
        tmpfont = gconf_client_get_string (data->client, APPLICATION_FONT_KEY, NULL);
        if (tmpfont != NULL) {
          g_free (data->revert_application_font);

          if (strcmp (theme->application_font, tmpfont) == 0) {
            g_free (tmpfont);
            data->revert_application_font = NULL;
          } else
            data->revert_application_font = tmpfont;
        }
        gconf_client_set_string (data->client, APPLICATION_FONT_KEY,
                                 theme->application_font, NULL);
      }

      if (theme->documents_font) {
        tmpfont = gconf_client_get_string (data->client, DOCUMENTS_FONT_KEY, NULL);
        if (tmpfont != NULL) {
          g_free (data->revert_documents_font);

          if (strcmp (theme->documents_font, tmpfont) == 0) {
            g_free (tmpfont);
            data->revert_documents_font = NULL;
          } else
            data->revert_documents_font = tmpfont;
        }
        gconf_client_set_string (data->client, DOCUMENTS_FONT_KEY,
                                 theme->documents_font, NULL);
      }

      if (theme->desktop_font) {
        tmpfont = gconf_client_get_string (data->client, DESKTOP_FONT_KEY, NULL);
        if (tmpfont != NULL) {
          g_free (data->revert_desktop_font);

          if (strcmp (theme->desktop_font, tmpfont) == 0) {
            g_free (tmpfont);
            data->revert_desktop_font = NULL;
          } else
            data->revert_desktop_font = tmpfont;
        }
        gconf_client_set_string (data->client, DESKTOP_FONT_KEY,
                                 theme->desktop_font, NULL);
      }

      if (theme->windowtitle_font) {
        tmpfont = gconf_client_get_string (data->client, WINDOWTITLE_FONT_KEY, NULL);
        if (tmpfont != NULL) {
          g_free (data->revert_windowtitle_font);

          if (strcmp (theme->windowtitle_font, tmpfont) == 0) {
            g_free (tmpfont);
            data->revert_windowtitle_font = NULL;
          } else
            data->revert_windowtitle_font = tmpfont;
        }
        gconf_client_set_string (data->client, WINDOWTITLE_FONT_KEY,
                                 theme->windowtitle_font, NULL);
      }

      if (theme->monospace_font) {
        tmpfont = gconf_client_get_string (data->client, MONOSPACE_FONT_KEY, NULL);
        if (tmpfont != NULL) {
          g_free (data->revert_monospace_font);

          if (strcmp (theme->monospace_font, tmpfont) == 0) {
            g_free (tmpfont);
            data->revert_monospace_font = NULL;
          } else
            data->revert_monospace_font = tmpfont;
        }
        gconf_client_set_string (data->client, MONOSPACE_FONT_KEY,
                                 theme->monospace_font, NULL);
      }
      break;

    case RESPONSE_INSTALL_ENGINE:
      engine_path = gtk_theme_info_missing_engine (theme->gtk_theme_name, FALSE);
      if (engine_path != NULL) {
              theme_install_file (GTK_WINDOW (gtk_widget_get_toplevel (data->install_button)),
                                  engine_path);
              g_free (engine_path);
      }
      theme_message_area_update (data);
      break;
  }
}

static void
theme_message_area_update (AppearanceData *data)
{
  const GnomeThemeMetaInfo *theme;
  gboolean show_apply_background = FALSE;
  gboolean show_apply_font = FALSE;
  gboolean show_revert_font = FALSE;
  gboolean show_error;
  const gchar *message;
  gchar *font;
  GError *error = NULL;

  theme = theme_get_selected (GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list")), data);

  if (!theme) {
    if (data->theme_message_area != NULL)
      gtk_widget_hide (data->theme_message_area);
    return;
  }

  show_error = !gnome_theme_meta_info_validate (theme, &error);

  if (!show_error) {
    if (theme->background_image != NULL) {
      gchar *background;

      background = gconf_client_get_string (data->client, BACKGROUND_KEY, NULL);
      show_apply_background =
          (!background || strcmp (theme->background_image, background) != 0);
      g_free (background);
    }

    if (theme->application_font) {
      font = gconf_client_get_string (data->client, APPLICATION_FONT_KEY, NULL);
      show_apply_font =
          (!font || strcmp (theme->application_font, font) != 0);
      g_free (font);
    }

    if (!show_apply_font && theme->documents_font) {
      font = gconf_client_get_string (data->client, DOCUMENTS_FONT_KEY, NULL);
      show_apply_font =
          (!font || strcmp (theme->application_font, font) != 0);
      g_free (font);
    }

    if (!show_apply_font && theme->desktop_font) {
      font = gconf_client_get_string (data->client, DESKTOP_FONT_KEY, NULL);
      show_apply_font =
          (!font || strcmp (theme->application_font, font) != 0);
      g_free (font);
    }

    if (!show_apply_font && theme->windowtitle_font) {
      font = gconf_client_get_string (data->client, WINDOWTITLE_FONT_KEY, NULL);
      show_apply_font =
          (!font || strcmp (theme->application_font, font) != 0);
      g_free (font);
    }

    if (!show_apply_font && theme->monospace_font) {
      font = gconf_client_get_string (data->client, MONOSPACE_FONT_KEY, NULL);
      show_apply_font =
          (!font || strcmp (theme->application_font, font) != 0);
      g_free (font);
    }

    show_revert_font = (data->revert_application_font != NULL ||
      data->revert_documents_font != NULL || data->revert_desktop_font != NULL ||
      data->revert_windowtitle_font != NULL || data->revert_monospace_font != NULL);
  }

  if (data->theme_message_area == NULL) {
    GtkWidget *hbox;
    GtkWidget *parent;

    if (!show_apply_background && !show_revert_font && !show_apply_font && !show_error)
      return;

    data->theme_message_area = gedit_message_area_new ();
    gtk_widget_set_no_show_all (data->theme_message_area, TRUE);

    g_signal_connect (data->theme_message_area, "response",
                      (GCallback) theme_message_area_response_cb, data);

    data->apply_background_button = gedit_message_area_add_button (
        GEDIT_MESSAGE_AREA (data->theme_message_area),
        _("Apply Background"),
        RESPONSE_APPLY_BG);
    data->apply_font_button = gedit_message_area_add_button (
        GEDIT_MESSAGE_AREA (data->theme_message_area),
        _("Apply Font"),
        RESPONSE_APPLY_FONT);
    data->revert_font_button = gedit_message_area_add_button (
        GEDIT_MESSAGE_AREA (data->theme_message_area),
        _("Revert Font"),
        RESPONSE_REVERT_FONT);
    data->install_button = gedit_message_area_add_button (
        GEDIT_MESSAGE_AREA (data->theme_message_area),
        _("Install"),
        RESPONSE_INSTALL_ENGINE);

    data->theme_message_label = gtk_label_new (NULL);
    gtk_widget_show (data->theme_message_label);
    gtk_label_set_line_wrap (GTK_LABEL (data->theme_message_label), TRUE);
    gtk_misc_set_alignment (GTK_MISC (data->theme_message_label), 0.0, 0.5);

    hbox = gtk_hbox_new (FALSE, 9);
    gtk_widget_show (hbox);
    data->theme_info_icon = gtk_image_new_from_stock (GTK_STOCK_DIALOG_INFO, GTK_ICON_SIZE_DIALOG);
    data->theme_error_icon = gtk_image_new_from_stock (GTK_STOCK_DIALOG_WARNING, GTK_ICON_SIZE_DIALOG);
    gtk_misc_set_alignment (GTK_MISC (data->theme_info_icon), 0.5, 0);
    gtk_misc_set_alignment (GTK_MISC (data->theme_error_icon), 0.5, 0);
    gtk_box_pack_start (GTK_BOX (hbox), data->theme_info_icon, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), data->theme_error_icon, FALSE, FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), data->theme_message_label, TRUE, TRUE, 0);
    gedit_message_area_set_contents (GEDIT_MESSAGE_AREA (data->theme_message_area), hbox);

    parent = glade_xml_get_widget (data->xml, "theme_list_vbox");
    gtk_box_pack_start (GTK_BOX (parent), data->theme_message_area, FALSE, FALSE, 0);
  }

  if (show_error)
    message = error->message;
  else if (show_apply_background && show_apply_font && show_revert_font)
    message = _("The current theme suggests a background and a font. Also, the last applied font suggestion can be reverted.");
  else if (show_apply_background && show_revert_font)
    message = _("The current theme suggests a background. Also, the last applied font suggestion can be reverted.");
  else if (show_apply_background && show_apply_font)
    message = _("The current theme suggests a background and a font.");
  else if (show_apply_font && show_revert_font)
    message = _("The current theme suggests a font. Also, the last applied font suggestion can be reverted.");
  else if (show_apply_background)
    message = _("The current theme suggests a background.");
  else if (show_revert_font)
    message = _("The last applied font suggestion can be reverted.");
  else if (show_apply_font)
    message = _("The current theme suggests a font.");
  else
    message = NULL;

  if (show_apply_background)
    gtk_widget_show (data->apply_background_button);
  else
    gtk_widget_hide (data->apply_background_button);

  if (show_apply_font)
    gtk_widget_show (data->apply_font_button);
  else
    gtk_widget_hide (data->apply_font_button);

  if (show_revert_font)
    gtk_widget_show (data->revert_font_button);
  else
    gtk_widget_hide (data->revert_font_button);

  if (show_error
      && g_error_matches (error, GNOME_THEME_ERROR, GNOME_THEME_ERROR_GTK_ENGINE_NOT_AVAILABLE)
      && packagekit_available ())
    gtk_widget_show (data->install_button);
  else
    gtk_widget_hide (data->install_button);

  if (show_error || show_apply_background || show_apply_font || show_revert_font) {
    gtk_widget_show (data->theme_message_area);
    gtk_widget_queue_draw (data->theme_message_area);

    if (show_error) {
      gtk_widget_show (data->theme_error_icon);
      gtk_widget_hide (data->theme_info_icon);
    } else {
      gtk_widget_show (data->theme_info_icon);
      gtk_widget_hide (data->theme_error_icon);
    }
  } else {
    gtk_widget_hide (data->theme_message_area);
  }

  gtk_label_set_text (GTK_LABEL (data->theme_message_label), message);
  g_clear_error (&error);
}

static void
theme_selection_changed_cb (GtkWidget *icon_view, AppearanceData *data)
{
  GList *selection;
  GnomeThemeMetaInfo *theme = NULL;
  gboolean is_custom = FALSE;

  selection = gtk_icon_view_get_selected_items (GTK_ICON_VIEW (icon_view));

  if (selection) {
    GtkTreeModel *model;
    GtkTreeIter iter;
    gchar *name;

    model = gtk_icon_view_get_model (GTK_ICON_VIEW (icon_view));
    gtk_tree_model_get_iter (model, &iter, selection->data);
    gtk_tree_model_get (model, &iter, COL_NAME, &name, -1);

    is_custom = !strcmp (name, CUSTOM_THEME_NAME);

    if (is_custom)
      theme = data->theme_custom;
    else
      theme = gnome_theme_meta_info_find (name);

    if (theme) {
      gnome_meta_theme_set (theme);
      theme_message_area_update (data);
    }

    g_free (name);
    g_list_foreach (selection, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (selection);
  }

  gtk_widget_set_sensitive (glade_xml_get_widget (data->xml, "theme_delete"),
			    theme_is_writable (theme));
  gtk_widget_set_sensitive (glade_xml_get_widget (data->xml, "theme_save"), is_custom);
}

static void
theme_custom_cb (GtkWidget *button, AppearanceData *data)
{
  GtkWidget *w, *parent;

  w = glade_xml_get_widget (data->xml, "theme_details");
  parent = glade_xml_get_widget (data->xml, "appearance_window");
  gtk_window_set_transient_for (GTK_WINDOW (w), GTK_WINDOW (parent));
  gtk_widget_show_all (w);
}

static void
theme_save_cb (GtkWidget *button, AppearanceData *data)
{
  theme_save_dialog_run (data->theme_custom, data);
}

static void
theme_install_cb (GtkWidget *button, AppearanceData *data)
{
  gnome_theme_installer_run (
      GTK_WINDOW (glade_xml_get_widget (data->xml, "appearance_window")), NULL);
}

static void
theme_delete_cb (GtkWidget *button, AppearanceData *data)
{
  GtkIconView *icon_view = GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list"));
  GList *selected = gtk_icon_view_get_selected_items (icon_view);

  if (selected) {
    GtkTreePath *path = selected->data;
    GtkTreeModel *model = gtk_icon_view_get_model (icon_view);
    GtkTreeIter iter;
    gchar *name = NULL;

    if (gtk_tree_model_get_iter (model, &iter, path))
      gtk_tree_model_get (model, &iter, COL_NAME, &name, -1);

    if (name != NULL &&
        strcmp (name, data->theme_custom->name) &&
        theme_delete (name, THEME_TYPE_META)) {
      /* remove theme from the model, too */
      GtkTreeIter child;

      if (gtk_tree_model_iter_next (model, &iter) ||
          theme_model_iter_last (model, &iter))
        theme_select_iter (icon_view, &iter);

      gtk_tree_model_get_iter (model, &iter, path);
      gtk_tree_model_sort_convert_iter_to_child_iter (
          GTK_TREE_MODEL_SORT (model), &child, &iter);
      gtk_list_store_remove (data->theme_store, &child);
    }

    g_list_foreach (selected, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (selected);
    g_free (name);
  }
}

static void
theme_details_changed_cb (AppearanceData *data)
{
  GnomeThemeMetaInfo *gconf_theme;
  const GnomeThemeMetaInfo *selected;
  GtkIconView *icon_view;
  gboolean done = FALSE;

  /* load new state from gconf */
  gconf_theme = theme_load_from_gconf (data->client);

  /* check if it's our currently selected theme */
  icon_view = GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list"));
  selected = theme_get_selected (icon_view, data);

  if (!selected || !(done = theme_is_equal (selected, gconf_theme))) {
    /* look for a matching metatheme */
    GList *theme_list, *l;

    theme_list = gnome_theme_meta_info_find_all ();

    for (l = theme_list; l; l = l->next) {
      GnomeThemeMetaInfo *info = l->data;

      if (theme_is_equal (gconf_theme, info)) {
        theme_select_name (icon_view, info->name);
        done = TRUE;
        break;
      }
    }
    g_list_free (theme_list);
  }

  if (!done)
    /* didn't find a match, set or update custom */
    theme_set_custom_from_theme (gconf_theme, data);

  gnome_theme_meta_info_free (gconf_theme);
}

static void
theme_setting_changed_cb (GObject *settings,
                          GParamSpec *pspec,
                          AppearanceData *data)
{
  theme_details_changed_cb (data);
}

static void
theme_gconf_changed (GConfClient *client,
                     guint conn_id,
                     GConfEntry *entry,
                     AppearanceData *data)
{
  theme_details_changed_cb (data);
}

static gint
theme_list_sort_func (GnomeThemeMetaInfo *a,
                      GnomeThemeMetaInfo *b)
{
  return strcmp (a->readable_name, b->readable_name);
}

static gint
theme_store_sort_func (GtkTreeModel *model,
                      GtkTreeIter *a,
                      GtkTreeIter *b,
                      gpointer user_data)
{
  gchar *a_name, *a_label;
  gint rc;

  gtk_tree_model_get (model, a, COL_NAME, &a_name, COL_LABEL, &a_label, -1);

  if (!strcmp (a_name, CUSTOM_THEME_NAME)) {
    rc = -1;
  } else {
    gchar *b_name, *b_label;

    gtk_tree_model_get (model, b, COL_NAME, &b_name, COL_LABEL, &b_label, -1);

    if (!strcmp (b_name, CUSTOM_THEME_NAME)) {
      rc = 1;
    } else {
      gchar *a_case, *b_case;

      a_case = g_utf8_casefold (a_label, -1);
      b_case = g_utf8_casefold (b_label, -1);
      rc = g_utf8_collate (a_case, b_case);
      g_free (a_case);
      g_free (b_case);
    }

    g_free (b_name);
    g_free (b_label);
  }

  g_free (a_name);
  g_free (a_label);

  return rc;
}

static void
theme_drag_data_received_cb (GtkWidget *widget,
                             GdkDragContext *context,
                             gint x, gint y,
                             GtkSelectionData *selection_data,
                             guint info, guint time,
                             AppearanceData *data)
{
  gchar **uris;

  if (!(info == TARGET_URI_LIST || info == TARGET_NS_URL))
    return;

  uris = g_uri_list_extract_uris ((gchar *) selection_data->data);

  if (uris != NULL && uris[0] != NULL) {
    GFile *f = g_file_new_for_uri (uris[0]);

    gnome_theme_install (f,
        GTK_WINDOW (glade_xml_get_widget (data->xml, "appearance_window")));
    g_object_unref (f);
  }

  g_strfreev (uris);
}

static void
background_or_font_changed (GConfEngine *conf,
                            guint cnxn_id,
                            GConfEntry *entry,
                            AppearanceData *data)
{
  theme_message_area_update (data);
}

void
themes_init (AppearanceData *data)
{
  GtkWidget *w, *del_button;
  GList *theme_list, *l;
  GtkListStore *theme_store;
  GtkTreeModel *sort_model;
  GnomeThemeMetaInfo *meta_theme = NULL;
  GtkIconView *icon_view;
  GtkCellRenderer *renderer;
  GtkSettings *settings;

  /* initialise some stuff */
  gnome_theme_init ();
  gnome_wm_manager_init ();

  data->revert_application_font = NULL;
  data->revert_documents_font = NULL;
  data->revert_desktop_font = NULL;
  data->revert_windowtitle_font = NULL;
  data->revert_monospace_font = NULL;
  data->theme_save_dialog = NULL;
  data->theme_message_area = NULL;
  data->theme_info_icon = NULL;
  data->theme_error_icon = NULL;
  data->theme_custom = gnome_theme_meta_info_new ();
  data->theme_icon = gdk_pixbuf_new_from_file (GNOMECC_PIXMAP_DIR "/theme-thumbnailing.png", NULL);
  data->theme_store = theme_store =
      gtk_list_store_new (NUM_COLS, GDK_TYPE_PIXBUF, G_TYPE_STRING, G_TYPE_STRING);

  /* set up theme list */
  theme_list = gnome_theme_meta_info_find_all ();
  gnome_theme_info_register_theme_change ((ThemeChangedCallback) theme_changed_on_disk_cb, data);

  data->theme_custom = theme_load_from_gconf (data->client);
  data->theme_custom->name = g_strdup (CUSTOM_THEME_NAME);
  data->theme_custom->readable_name = g_strdup_printf ("<i>%s</i>", _("Custom"));

  for (l = theme_list; l; l = l->next) {
    GnomeThemeMetaInfo *info = l->data;

    gtk_list_store_insert_with_values (theme_store, NULL, 0,
        COL_LABEL, info->readable_name,
        COL_NAME, info->name,
        COL_THUMBNAIL, data->theme_icon,
        -1);

    if (!meta_theme && theme_is_equal (data->theme_custom, info))
      meta_theme = info;
  }

  if (!meta_theme) {
    /* add custom theme */
    meta_theme = data->theme_custom;

    gtk_list_store_insert_with_values (theme_store, NULL, 0,
        COL_LABEL, meta_theme->readable_name,
        COL_NAME, meta_theme->name,
        COL_THUMBNAIL, data->theme_icon,
        -1);

    theme_thumbnail_generate (meta_theme, data);
  }

  theme_list = g_list_sort (theme_list, (GCompareFunc) theme_list_sort_func);

  g_list_foreach (theme_list, (GFunc) theme_thumbnail_generate, data);
  g_list_free (theme_list);

  icon_view = GTK_ICON_VIEW (glade_xml_get_widget (data->xml, "theme_list"));

  renderer = cell_renderer_wallpaper_new ();
  g_object_set (renderer, "xpad", 5, "ypad", 5,
                          "xalign", 0.5, "yalign", 1.0, NULL);
  gtk_cell_layout_pack_end (GTK_CELL_LAYOUT (icon_view), renderer, FALSE);
  gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (icon_view), renderer,
                                  "pixbuf", COL_THUMBNAIL, NULL);

  renderer = cell_renderer_caption_new ();
  g_object_set (renderer, "alignment", PANGO_ALIGN_CENTER,
			  "wrap-mode", PANGO_WRAP_WORD_CHAR,
			  "wrap-width", gtk_icon_view_get_item_width (icon_view),
			  "width", gtk_icon_view_get_item_width (icon_view),
			  "xalign", 0.0, "yalign", 0.0, NULL);
  gtk_cell_layout_pack_end (GTK_CELL_LAYOUT (icon_view), renderer, FALSE);
  gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (icon_view), renderer,
                                  "markup", COL_LABEL, NULL);

  sort_model = gtk_tree_model_sort_new_with_model (GTK_TREE_MODEL (theme_store));
  gtk_tree_sortable_set_sort_func (GTK_TREE_SORTABLE (sort_model), COL_LABEL, theme_store_sort_func, NULL, NULL);
  gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (sort_model), COL_LABEL, GTK_SORT_ASCENDING);
  gtk_icon_view_set_model (icon_view, GTK_TREE_MODEL (sort_model));

  g_signal_connect (icon_view, "selection-changed", (GCallback) theme_selection_changed_cb, data);
  g_signal_connect_after (icon_view, "realize", (GCallback) theme_select_name, meta_theme->name);

  w = glade_xml_get_widget (data->xml, "theme_install");
  gtk_button_set_image (GTK_BUTTON (w),
                        gtk_image_new_from_stock (GTK_STOCK_OPEN, GTK_ICON_SIZE_BUTTON));
  g_signal_connect (w, "clicked", (GCallback) theme_install_cb, data);

  w = glade_xml_get_widget (data->xml, "theme_save");
  gtk_button_set_image (GTK_BUTTON (w),
                        gtk_image_new_from_stock (GTK_STOCK_SAVE_AS, GTK_ICON_SIZE_BUTTON));
  g_signal_connect (w, "clicked", (GCallback) theme_save_cb, data);

  w = glade_xml_get_widget (data->xml, "theme_custom");
  gtk_button_set_image (GTK_BUTTON (w),
                        gtk_image_new_from_stock (GTK_STOCK_EDIT, GTK_ICON_SIZE_BUTTON));
  g_signal_connect (w, "clicked", (GCallback) theme_custom_cb, data);

  del_button = glade_xml_get_widget (data->xml, "theme_delete");
  g_signal_connect (del_button, "clicked", (GCallback) theme_delete_cb, data);

  w = glade_xml_get_widget (data->xml, "theme_vbox");
  gtk_drag_dest_set (w, GTK_DEST_DEFAULT_ALL,
		     drop_types, G_N_ELEMENTS (drop_types),
		     GDK_ACTION_COPY | GDK_ACTION_LINK | GDK_ACTION_MOVE);
  g_signal_connect (w, "drag-data-received", (GCallback) theme_drag_data_received_cb, data);
  if (is_locked_down (data->client))
    gtk_widget_set_sensitive (w, FALSE);

  /* listen to gconf changes, too */
  gconf_client_add_dir (data->client, "/apps/metacity/general", GCONF_CLIENT_PRELOAD_NONE, NULL);
  gconf_client_add_dir (data->client, "/desktop/gnome/interface", GCONF_CLIENT_PRELOAD_NONE, NULL);
  gconf_client_notify_add (data->client, METACITY_THEME_KEY, (GConfClientNotifyFunc) theme_gconf_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, CURSOR_THEME_KEY, (GConfClientNotifyFunc) theme_gconf_changed, data, NULL, NULL);
#ifdef HAVE_XCURSOR
  gconf_client_notify_add (data->client, CURSOR_SIZE_KEY, (GConfClientNotifyFunc) theme_gconf_changed, data, NULL, NULL);
#endif
  gconf_client_notify_add (data->client, BACKGROUND_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, APPLICATION_FONT_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, DOCUMENTS_FONT_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, DESKTOP_FONT_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, WINDOWTITLE_FONT_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);
  gconf_client_notify_add (data->client, MONOSPACE_FONT_KEY, (GConfClientNotifyFunc) background_or_font_changed, data, NULL, NULL);

  settings = gtk_settings_get_default ();
  g_signal_connect (settings, "notify::gtk-color-scheme", (GCallback) theme_setting_changed_cb, data);
  g_signal_connect (settings, "notify::gtk-theme-name", (GCallback) theme_setting_changed_cb, data);
  g_signal_connect (settings, "notify::gtk-icon-theme-name", (GCallback) theme_setting_changed_cb, data);

  /* monitor individual font choice buttons, so
     "revert font" option (if any) can be cleared */
  w = glade_xml_get_widget (data->xml, "application_font");
  g_signal_connect (w, "font_set", (GCallback) custom_font_cb, data);
  w = glade_xml_get_widget (data->xml, "document_font");
  g_signal_connect (w, "font_set", (GCallback) custom_font_cb, data);
  w = glade_xml_get_widget (data->xml, "desktop_font");
  g_signal_connect (w, "font_set", (GCallback) custom_font_cb, data);
  w = glade_xml_get_widget (data->xml, "window_title_font");
  g_signal_connect (w, "font_set", (GCallback) custom_font_cb, data);
  w = glade_xml_get_widget (data->xml, "monospace_font");
  g_signal_connect (w, "font_set", (GCallback) custom_font_cb, data);
}

void
themes_shutdown (AppearanceData *data)
{
  gnome_theme_meta_info_free (data->theme_custom);

  if (data->theme_icon)
    g_object_unref (data->theme_icon);
  if (data->theme_save_dialog)
    gtk_widget_destroy (data->theme_save_dialog);
  g_free (data->revert_application_font);
  g_free (data->revert_documents_font);
  g_free (data->revert_desktop_font);
  g_free (data->revert_windowtitle_font);
  g_free (data->revert_monospace_font);
}
