/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * gedit-preferences-dialog.c
 * This file is part of gedit
 *
 * Copyright (C) 2001-2005 Paolo Maggi 
 *
 * 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. 
 */

/*
 * Modified by the gedit Team, 2001-2003. See the AUTHORS file for a 
 * list of people on the gedit Team.  
 * See the ChangeLog files for a list of changes. 
 *
 * $Id$
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <libpeas-gtk/peas-gtk-plugin-manager.h>
#include <gtksourceview/gtksource.h>

#include "gedit-preferences-dialog.h"
#include "gedit-utils.h"
#include "gedit-debug.h"
#include "gedit-document.h"
#include "gedit-dirs.h"
#include "gedit-settings.h"
#include "gedit-utils.h"

/*
 * gedit-preferences dialog is a singleton since we don't
 * want two dialogs showing an inconsistent state of the
 * preferences.
 * When gedit_show_preferences_dialog is called and there
 * is already a prefs dialog dialog open, it is reparented
 * and shown.
 */

static GtkWidget *preferences_dialog = NULL;


enum
{
	ID_COLUMN = 0,
	NAME_COLUMN,
	DESC_COLUMN,
	NUM_COLUMNS
};


#define GEDIT_PREFERENCES_DIALOG_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), \
						     GEDIT_TYPE_PREFERENCES_DIALOG, \
						     GeditPreferencesDialogPrivate))

struct _GeditPreferencesDialogPrivate
{
	GSettings	*editor;

	GtkWidget	*notebook;

	/* Font */
	GtkWidget	*default_font_checkbutton;
	GtkWidget	*font_button;
	GtkWidget	*font_hbox;

	/* Style Scheme */
	GtkListStore	*schemes_treeview_model;
	GtkWidget	*schemes_treeview;
	GtkWidget	*install_scheme_button;
	GtkWidget	*uninstall_scheme_button;
	GtkWidget	*schemes_scrolled_window;
	GtkWidget	*schemes_toolbar;

	GtkWidget	*install_scheme_file_schooser;

	/* Tabs */
	GtkWidget	*tabs_width_spinbutton;
	GtkWidget	*insert_spaces_checkbutton;
	GtkWidget	*tabs_width_hbox;

	/* Auto indentation */
	GtkWidget	*auto_indent_checkbutton;

	/* Text Wrapping */
	GtkWidget	*wrap_text_checkbutton;
	GtkWidget	*split_checkbutton;

	/* File Saving */
	GtkWidget	*backup_copy_checkbutton;
	GtkWidget	*auto_save_checkbutton;
	GtkWidget	*auto_save_spinbutton;
	GtkWidget	*autosave_hbox;
	
	GtkWidget	*display_line_numbers_checkbutton;
	
	/* Right margin */
	GtkWidget	*right_margin_checkbutton;
	GtkWidget	*right_margin_position_spinbutton;

	/* Highlighting */
	GtkWidget	*highlight_current_line_checkbutton;
	GtkWidget	*bracket_matching_checkbutton;

	/* Plugins manager */
	GtkWidget	*plugin_manager_place_holder;
};


G_DEFINE_TYPE(GeditPreferencesDialog, gedit_preferences_dialog, GTK_TYPE_DIALOG)


static void
gedit_preferences_dialog_dispose (GObject *object)
{
	GeditPreferencesDialog *dlg = GEDIT_PREFERENCES_DIALOG (object);

	g_clear_object (&dlg->priv->editor);

	G_OBJECT_CLASS (gedit_preferences_dialog_parent_class)->dispose (object);
}

static void 
gedit_preferences_dialog_class_init (GeditPreferencesDialogClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);
	
	object_class->dispose = gedit_preferences_dialog_dispose;

	g_type_class_add_private (object_class, sizeof (GeditPreferencesDialogPrivate));
}

static void
dialog_response_handler (GtkDialog *dlg, 
			 gint       res_id)
{
	gedit_debug (DEBUG_PREFS);

	switch (res_id)
	{
		case GTK_RESPONSE_HELP:
			gedit_app_show_help (GEDIT_APP (g_application_get_default ()),
			                     GTK_WINDOW (dlg),
			                     NULL,
			                     "index#configure-gedit");

			g_signal_stop_emission_by_name (dlg, "response");

			break;

		default:
			gtk_widget_destroy (GTK_WIDGET(dlg));
	}
}

static void
on_auto_save_changed (GSettings              *settings,
		      const gchar            *key,
		      GeditPreferencesDialog *dlg)
{
	gboolean value;

	gedit_debug (DEBUG_PREFS);
	
	value = g_settings_get_boolean (settings, key);

	gtk_widget_set_sensitive (dlg->priv->auto_save_spinbutton, value);
}

static void
setup_editor_page (GeditPreferencesDialog *dlg)
{
	gboolean auto_save;

	gedit_debug (DEBUG_PREFS);

	/* Get values */
	auto_save = g_settings_get_boolean (dlg->priv->editor,
					    GEDIT_SETTINGS_AUTO_SAVE);

	/* Set widget sensitivity */
	gtk_widget_set_sensitive (dlg->priv->auto_save_spinbutton,
				  auto_save);

	/* Connect signal */
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_TABS_SIZE,
			 dlg->priv->tabs_width_spinbutton,
			 "value",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_INSERT_SPACES,
			 dlg->priv->insert_spaces_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_AUTO_INDENT,
			 dlg->priv->auto_indent_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_CREATE_BACKUP_COPY,
			 dlg->priv->backup_copy_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_BRACKET_MATCHING,
			 dlg->priv->bracket_matching_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_AUTO_SAVE_INTERVAL,
			 dlg->priv->auto_save_spinbutton,
			 "value",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_signal_connect (dlg->priv->editor,
			  "changed::auto-save",
			  G_CALLBACK (on_auto_save_changed),
			  dlg);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_AUTO_SAVE,
			 dlg->priv->auto_save_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
}

static gboolean split_button_state = TRUE;

static void
wrap_mode_checkbutton_toggled (GtkToggleButton        *button, 
			       GeditPreferencesDialog *dlg)
{
	GtkWrapMode mode;

	if (!gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (dlg->priv->wrap_text_checkbutton)))
	{
		mode = GTK_WRAP_NONE;

		gtk_widget_set_sensitive (dlg->priv->split_checkbutton, 
					  FALSE);
		gtk_toggle_button_set_inconsistent (
			GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), TRUE);
	}
	else
	{
		gtk_widget_set_sensitive (dlg->priv->split_checkbutton, 
					  TRUE);

		gtk_toggle_button_set_inconsistent (
			GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), FALSE);


		if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton)))
		{
			split_button_state = TRUE;

			mode = GTK_WRAP_WORD;
		}
		else
		{
			split_button_state = FALSE;

			mode = GTK_WRAP_CHAR;
		}
	}

	g_settings_set_enum (dlg->priv->editor,
			     GEDIT_SETTINGS_WRAP_MODE,
			     mode);
}

static void
right_margin_checkbutton_toggled (GtkToggleButton        *button,
				  GeditPreferencesDialog *dlg)
{
	gboolean active;
	
	g_return_if_fail (button == GTK_TOGGLE_BUTTON (dlg->priv->right_margin_checkbutton));

	active = gtk_toggle_button_get_active (button);
	
	g_settings_set_boolean (dlg->priv->editor, GEDIT_SETTINGS_DISPLAY_RIGHT_MARGIN,
				active);

	gtk_widget_set_sensitive (dlg->priv->right_margin_position_spinbutton,
				  active);
}

static void
setup_view_page (GeditPreferencesDialog *dlg)
{
	GtkWrapMode wrap_mode;
	gboolean display_right_margin;
	guint right_margin_position;

	gedit_debug (DEBUG_PREFS);
	
	/* Get values */
	display_right_margin = g_settings_get_boolean (dlg->priv->editor,
						       GEDIT_SETTINGS_DISPLAY_RIGHT_MARGIN);
	g_settings_get (dlg->priv->editor, GEDIT_SETTINGS_RIGHT_MARGIN_POSITION,
			"u", &right_margin_position);
	
	/* Set initial state */
	wrap_mode = g_settings_get_enum (dlg->priv->editor,
					 GEDIT_SETTINGS_WRAP_MODE);

	switch (wrap_mode)
	{
		case GTK_WRAP_WORD:
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->wrap_text_checkbutton), TRUE);
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), TRUE);
			break;
		case GTK_WRAP_CHAR:
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->wrap_text_checkbutton), TRUE);
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), FALSE);
			break;
		default:
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->wrap_text_checkbutton), FALSE);
			gtk_toggle_button_set_active (
				GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), split_button_state);
			gtk_toggle_button_set_inconsistent (
				GTK_TOGGLE_BUTTON (dlg->priv->split_checkbutton), TRUE);

	}
	
	gtk_toggle_button_set_active (
		GTK_TOGGLE_BUTTON (dlg->priv->right_margin_checkbutton), 
		display_right_margin);
		
	/* Set widgets sensitivity */
	gtk_widget_set_sensitive (dlg->priv->split_checkbutton,
				  (wrap_mode != GTK_WRAP_NONE));
	gtk_widget_set_sensitive (dlg->priv->right_margin_position_spinbutton,
				  display_right_margin);
	/* Connect signals */
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_DISPLAY_LINE_NUMBERS,
			 dlg->priv->display_line_numbers_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_HIGHLIGHT_CURRENT_LINE,
			 dlg->priv->highlight_current_line_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_RIGHT_MARGIN_POSITION,
			 dlg->priv->right_margin_position_spinbutton,
			 "value",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_AUTO_SAVE_INTERVAL,
			 dlg->priv->auto_save_spinbutton,
			 "value",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_signal_connect (dlg->priv->wrap_text_checkbutton,
			  "toggled", 
			  G_CALLBACK (wrap_mode_checkbutton_toggled), 
			  dlg);
	g_signal_connect (dlg->priv->split_checkbutton,
			  "toggled",
			  G_CALLBACK (wrap_mode_checkbutton_toggled), 
			  dlg);
	g_signal_connect (dlg->priv->right_margin_checkbutton,
			  "toggled",
			  G_CALLBACK (right_margin_checkbutton_toggled), 
			  dlg);
}

static void
on_use_default_font_changed (GSettings              *settings,
			     const gchar            *key,
			     GeditPreferencesDialog *dlg)
{
	gboolean value;
	
	gedit_debug (DEBUG_PREFS);

	value = g_settings_get_boolean (settings, key);

	gtk_widget_set_sensitive (dlg->priv->font_hbox, !value);
}

static void
setup_font_colors_page_font_section (GeditPreferencesDialog *dlg)
{
	GObject *settings;
	gboolean use_default_font;
	gchar *system_font = NULL;
	gchar *label;

	gedit_debug (DEBUG_PREFS);

	gtk_widget_set_tooltip_text (dlg->priv->font_button,
			 _("Click on this button to select the font to be used by the editor"));

	gedit_utils_set_atk_relation (dlg->priv->font_button,
				      dlg->priv->default_font_checkbutton,
				      ATK_RELATION_CONTROLLED_BY);
	gedit_utils_set_atk_relation (dlg->priv->default_font_checkbutton,
				      dlg->priv->font_button, 
				      ATK_RELATION_CONTROLLER_FOR);

	/* Get values */
	settings = _gedit_app_get_settings (GEDIT_APP (g_application_get_default ()));
	system_font = gedit_settings_get_system_font (GEDIT_SETTINGS (settings));
	use_default_font = g_settings_get_boolean (dlg->priv->editor,
						   GEDIT_SETTINGS_USE_DEFAULT_FONT);

	label = g_strdup_printf(_("_Use the system fixed width font (%s)"),
				system_font);
	gtk_button_set_label (GTK_BUTTON (dlg->priv->default_font_checkbutton),
			      label);
	g_free (system_font);
	g_free (label);

	/* read current config and setup initial state */
	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (dlg->priv->default_font_checkbutton),
				      use_default_font);

	/* Set initial widget sensitivity */
	gtk_widget_set_sensitive (dlg->priv->font_hbox, !use_default_font);

	/* Connect signals */
	g_signal_connect (dlg->priv->editor,
			  "changed::use-default-font",
			  G_CALLBACK (on_use_default_font_changed),
			  dlg);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_USE_DEFAULT_FONT,
			 dlg->priv->default_font_checkbutton,
			 "active",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
	g_settings_bind (dlg->priv->editor,
			 GEDIT_SETTINGS_EDITOR_FONT,
			 dlg->priv->font_button,
			 "font-name",
			 G_SETTINGS_BIND_GET | G_SETTINGS_BIND_SET);
}

static gboolean
is_gedit_user_style_scheme (const gchar *scheme_id)
{
	GtkSourceStyleSchemeManager *manager;
	GtkSourceStyleScheme *scheme;
	gboolean res = FALSE;

	manager = gtk_source_style_scheme_manager_get_default ();
	scheme = gtk_source_style_scheme_manager_get_scheme (manager, scheme_id);
	if (scheme != NULL)
	{
		const gchar *filename;

		filename = gtk_source_style_scheme_get_filename (scheme);
		if (filename != NULL)
		{
			res = g_str_has_prefix (filename, gedit_dirs_get_user_styles_dir ());
		}
	}

	return res;
}

static void
set_buttons_sensisitivity_according_to_scheme (GeditPreferencesDialog *dlg,
					       const gchar            *scheme_id)
{
	gboolean editable;

	editable = ((scheme_id != NULL) && is_gedit_user_style_scheme (scheme_id));

	gtk_widget_set_sensitive (dlg->priv->uninstall_scheme_button,
				  editable);
}

static void
style_scheme_changed (GtkWidget              *treeview,
		      GeditPreferencesDialog *dlg)
{
	GtkTreePath *path;

	gtk_tree_view_get_cursor (GTK_TREE_VIEW (dlg->priv->schemes_treeview), &path, NULL);
	if (path != NULL)
	{
		GtkTreeIter iter;
		gchar *id;

		gtk_tree_model_get_iter (GTK_TREE_MODEL (dlg->priv->schemes_treeview_model),
					 &iter, path);
		gtk_tree_path_free (path);
		gtk_tree_model_get (GTK_TREE_MODEL (dlg->priv->schemes_treeview_model),
				    &iter, ID_COLUMN, &id, -1);

		g_settings_set_string (dlg->priv->editor, GEDIT_SETTINGS_SCHEME, id);

		set_buttons_sensisitivity_according_to_scheme (dlg, id);

		g_free (id);
	}
}

static const gchar *
ensure_color_scheme_id (GeditPreferencesDialog *dlg,
			const gchar            *id)
{
	GtkSourceStyleSchemeManager *manager;
	GtkSourceStyleScheme *scheme = NULL;

	manager = gtk_source_style_scheme_manager_get_default ();
	if (id == NULL)
	{
		gchar *pref_id;

		pref_id = g_settings_get_string (dlg->priv->editor,
						 GEDIT_SETTINGS_SCHEME);
		
		scheme = gtk_source_style_scheme_manager_get_scheme (manager,
								     pref_id);
		g_free (pref_id);
	}
	else
	{
		scheme = gtk_source_style_scheme_manager_get_scheme (manager,
								     id);
	}

	if (scheme == NULL)
	{
		/* Fall-back to classic style scheme */
		scheme = gtk_source_style_scheme_manager_get_scheme (manager,
								     "classic");
	}

	if (scheme == NULL)
	{
		/* Cannot determine default style scheme -> broken GtkSourceView installation */
		return NULL;
	}

	return 	gtk_source_style_scheme_get_id (scheme);
}

static const gchar *
populate_color_scheme_list (GeditPreferencesDialog *dlg, const gchar *def_id)
{
	GtkSourceStyleSchemeManager *manager;
	const gchar * const *ids;
	gint i;

	gtk_list_store_clear (dlg->priv->schemes_treeview_model);
	
	def_id = ensure_color_scheme_id (dlg, def_id);
	if (def_id == NULL) 
	{
		g_warning ("Cannot build the list of available color schemes.\n"
		           "Please check your GtkSourceView installation.");
		return NULL;
	}

	manager = gtk_source_style_scheme_manager_get_default ();
	ids = gtk_source_style_scheme_manager_get_scheme_ids (manager);
	for (i = 0; ids[i] != NULL; i++)
	{
		GtkSourceStyleScheme *scheme;
		const gchar *name;
		const gchar *description;
		GtkTreeIter iter;

		scheme = gtk_source_style_scheme_manager_get_scheme (manager, ids[i]);

		name = gtk_source_style_scheme_get_name (scheme);
		description = gtk_source_style_scheme_get_description (scheme);

		gtk_list_store_append (dlg->priv->schemes_treeview_model, &iter);
		gtk_list_store_set (dlg->priv->schemes_treeview_model,
				    &iter,
				    ID_COLUMN, ids[i],
				    NAME_COLUMN, name,
				    DESC_COLUMN, description,
				    -1);

		g_return_val_if_fail (def_id != NULL, NULL);
		if (strcmp (ids[i], def_id) == 0)
		{
			GtkTreeSelection *selection;

			selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (dlg->priv->schemes_treeview));
			gtk_tree_selection_select_iter (selection, &iter);
		}
	}
	
	return def_id;
}

/*
 * file_copy:
 * @name: a pointer to a %NULL-terminated string, that names
 * the file to be copied, in the GLib file name encoding
 * @dest_name: a pointer to a %NULL-terminated string, that is the
 * name for the destination file, in the GLib file name encoding
 * @error: return location for a #GError, or %NULL
 *
 * Copies file @name to @dest_name.
 *
 * If the call was successful, it returns %TRUE. If the call was not
 * successful, it returns %FALSE and sets @error. The error domain
 * is #G_FILE_ERROR. Possible error
 * codes are those in the #GFileError enumeration.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
static gboolean
file_copy (const gchar  *name,
	   const gchar  *dest_name,
	   GError      **error)
{
	gchar *contents;
	gsize length;
	gchar *dest_dir;

	/* FIXME - Paolo (Aug. 13, 2007):
	 * Since the style scheme files are relatively small, we can implement
	 * file copy getting all the content of the source file in a buffer and
	 * then write the content to the destination file. In this way we
	 * can use the g_file_get_contents and g_file_set_contents and avoid to
	 * write custom code to copy the file (with sane error management).
	 * If needed we can improve this code later. */

	g_return_val_if_fail (name != NULL, FALSE);
	g_return_val_if_fail (dest_name != NULL, FALSE);
	g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

	/* Note: we allow to copy a file to itself since this is not a problem
	 * in our use case */

	/* Ensure the destination directory exists */
	dest_dir = g_path_get_dirname (dest_name);

	errno = 0;
	if (g_mkdir_with_parents (dest_dir, 0755) != 0)
	{
		gint save_errno = errno;
		gchar *display_filename = g_filename_display_name (dest_dir);

		g_set_error (error,
			     G_FILE_ERROR,
			     g_file_error_from_errno (save_errno),
			     _("Directory '%s' could not be created: g_mkdir_with_parents() failed: %s"),
			     display_filename,
			     g_strerror (save_errno));

		g_free (dest_dir);
		g_free (display_filename);

		return FALSE;
	}

	g_free (dest_dir);

	if (!g_file_get_contents (name, &contents, &length, error))
		return FALSE;

	if (!g_file_set_contents (dest_name, contents, length, error))
		return FALSE;

	g_free (contents);

	return TRUE;
}

/*
 * install_style_scheme:
 * @manager: a #GtkSourceStyleSchemeManager
 * @fname: the file name of the style scheme to be installed
 *
 * Install a new user scheme.
 * This function copies @fname in #GEDIT_STYLES_DIR and ask the style manager to
 * recompute the list of available style schemes. It then checks if a style
 * scheme with the right file name exists.
 *
 * If the call was succesful, it returns the id of the installed scheme
 * otherwise %NULL.
 *
 * Return value: the id of the installed scheme, %NULL otherwise.
 */
static const gchar *
install_style_scheme (const gchar *fname)
{
	GtkSourceStyleSchemeManager *manager;
	gchar *new_file_name = NULL;
	gchar *dirname;
	const gchar *styles_dir;
	GError *error = NULL;
	gboolean copied = FALSE;
	const gchar* const *ids;

	g_return_val_if_fail (fname != NULL, NULL);

	manager = gtk_source_style_scheme_manager_get_default ();

	dirname = g_path_get_dirname (fname);
	styles_dir = gedit_dirs_get_user_styles_dir ();

	if (strcmp (dirname, styles_dir) != 0)
	{
		gchar *basename;

		basename = g_path_get_basename (fname);
		new_file_name = g_build_filename (styles_dir, basename, NULL);
		g_free (basename);

		/* Copy the style scheme file into GEDIT_STYLES_DIR */
		if (!file_copy (fname, new_file_name, &error))
		{
			g_free (new_file_name);

			g_message ("Cannot install style scheme:\n%s",
				   error->message);

			return NULL;
		}

		copied = TRUE;
	}
	else
	{
		new_file_name = g_strdup (fname);
	}

	g_free (dirname);

	/* Reload the available style schemes */
	gtk_source_style_scheme_manager_force_rescan (manager);

	/* Check the new style scheme has been actually installed */
	ids = gtk_source_style_scheme_manager_get_scheme_ids (manager);

	while (*ids != NULL)
	{
		GtkSourceStyleScheme *scheme;
		const gchar *filename;

		scheme = gtk_source_style_scheme_manager_get_scheme (manager, *ids);

		filename = gtk_source_style_scheme_get_filename (scheme);

		if (filename && (strcmp (filename, new_file_name) == 0))
		{
			/* The style scheme has been correctly installed */
			g_free (new_file_name);

			return gtk_source_style_scheme_get_id (scheme);
		}
		++ids;
	}

	/* The style scheme has not been correctly installed */
	if (copied)
		g_unlink (new_file_name);

	g_free (new_file_name);

	return NULL;
}

/**
 * uninstall_style_scheme:
 * @manager: a #GtkSourceStyleSchemeManager
 * @id: the id of the style scheme to be uninstalled
 *
 * Uninstall a user scheme.
 *
 * If the call was succesful, it returns %TRUE
 * otherwise %FALSE.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
static gboolean
uninstall_style_scheme (const gchar *id)
{
	GtkSourceStyleSchemeManager *manager;
	GtkSourceStyleScheme *scheme;
	const gchar *filename;

	g_return_val_if_fail (id != NULL, FALSE);

	manager = gtk_source_style_scheme_manager_get_default ();

	scheme = gtk_source_style_scheme_manager_get_scheme (manager, id);
	if (scheme == NULL)
		return FALSE;

	filename = gtk_source_style_scheme_get_filename (scheme);
	if (filename == NULL)
		return FALSE;

	if (g_unlink (filename) == -1)
		return FALSE;

	/* Reload the available style schemes */
	gtk_source_style_scheme_manager_force_rescan (manager);

	return TRUE;
}

static void
add_scheme_chooser_response_cb (GtkDialog              *chooser, 
				gint                    res_id,
				GeditPreferencesDialog *dlg)
{
	gchar* filename; 
	const gchar *scheme_id;
	
	if (res_id != GTK_RESPONSE_ACCEPT)
	{
		gtk_widget_hide (GTK_WIDGET (chooser));
		return;
	}
	
	filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (chooser));
	if (filename == NULL)
		return;
	
	gtk_widget_hide (GTK_WIDGET (chooser));

	scheme_id = install_style_scheme (filename);
	g_free (filename);

	if (scheme_id == NULL)
	{
		gedit_warning (GTK_WINDOW (dlg),
			       _("The selected color scheme cannot be installed."));

		return;
	}
	
	g_settings_set_string (dlg->priv->editor, GEDIT_SETTINGS_SCHEME,
			       scheme_id);

	scheme_id = populate_color_scheme_list (dlg, scheme_id);

	set_buttons_sensisitivity_according_to_scheme (dlg, scheme_id);
}

static void
install_scheme_clicked (GtkButton              *button,
			GeditPreferencesDialog *dlg)
{
	GtkWidget      *chooser;
	GtkFileFilter  *filter;
	
	if (dlg->priv->install_scheme_file_schooser != NULL)
	{
		gtk_window_present (GTK_WINDOW (dlg->priv->install_scheme_file_schooser));
		gtk_widget_grab_focus (dlg->priv->install_scheme_file_schooser);
		return;
	}

	chooser = gtk_file_chooser_dialog_new (_("Add Scheme"),
					       GTK_WINDOW (dlg),
					       GTK_FILE_CHOOSER_ACTION_OPEN,
					       GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
					       NULL);

	gedit_dialog_add_button (GTK_DIALOG (chooser), 
				 _("A_dd Scheme"),
				 GTK_STOCK_ADD,
				 GTK_RESPONSE_ACCEPT);

	gtk_window_set_destroy_with_parent (GTK_WINDOW (chooser), TRUE);
		
	/* Filters */
	filter = gtk_file_filter_new ();
	gtk_file_filter_set_name (filter, _("Color Scheme Files"));
	gtk_file_filter_add_pattern (filter, "*.xml");
	gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);

	gtk_file_chooser_set_filter (GTK_FILE_CHOOSER (chooser), filter);
	
	filter = gtk_file_filter_new ();
	gtk_file_filter_set_name (filter, _("All Files"));
	gtk_file_filter_add_pattern (filter, "*");
	gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser), filter);

	gtk_dialog_set_default_response (GTK_DIALOG (chooser), GTK_RESPONSE_ACCEPT);
			
	g_signal_connect (chooser,
			  "response",
			  G_CALLBACK (add_scheme_chooser_response_cb),
			  dlg);

	dlg->priv->install_scheme_file_schooser = chooser;
	
	g_object_add_weak_pointer (G_OBJECT (chooser),
				   (gpointer) &dlg->priv->install_scheme_file_schooser);
				   
	gtk_widget_show (chooser);	
}

static void
uninstall_scheme_clicked (GtkButton              *button,
			  GeditPreferencesDialog *dlg)
{
	GtkTreeSelection *selection;
	GtkTreeModel *model;
	GtkTreeIter iter;

	selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (dlg->priv->schemes_treeview));
	model = GTK_TREE_MODEL (dlg->priv->schemes_treeview_model);

	if (gtk_tree_selection_get_selected (selection,
					     &model,
					     &iter))
	{
		gchar *id;
		gchar *name;

		gtk_tree_model_get (model, &iter,
				    ID_COLUMN, &id,
				    NAME_COLUMN, &name,
				    -1);
	
		if (!uninstall_style_scheme (id))
		{
			gedit_warning (GTK_WINDOW (dlg),
				       _("Could not remove color scheme \"%s\"."),
				       name);
		}
		else
		{	
			const gchar *real_new_id;
			gchar *new_id = NULL;
			GtkTreePath *path;
			GtkTreeIter new_iter;
			gboolean new_iter_set = FALSE;

			/* If the removed style scheme is the last of the list,
			 * set as new default style scheme the previous one,
			 * otherwise set the next one.
			 * To make this possible, we need to get the id of the
			 * new default style scheme before re-populating the list.
			 * Fall back to "classic" if it is not possible to get
			 * the id
			 */
			path = gtk_tree_model_get_path (model, &iter);

			/* Try to move to the next path */
			gtk_tree_path_next (path);
			if (!gtk_tree_model_get_iter (model, &new_iter, path))
			{
				/* It seems the removed style scheme was the 
				 * last of the list. Try to move to the 
				 * previous one */
				gtk_tree_path_free (path);

				path = gtk_tree_model_get_path (model, &iter);
				
				gtk_tree_path_prev (path);
				if (gtk_tree_model_get_iter (model, &new_iter, path))
					new_iter_set = TRUE;
			}
			else
			{
				new_iter_set = TRUE;
			}

			gtk_tree_path_free (path);
						
			if (new_iter_set)
				gtk_tree_model_get (model, &new_iter,
						    ID_COLUMN, &new_id,
						    -1);
						    			
			real_new_id = populate_color_scheme_list (dlg, new_id);
			g_free (new_id);
	
			set_buttons_sensisitivity_according_to_scheme (dlg, real_new_id);
			
			if (real_new_id != NULL)
			{
				g_settings_set_string (dlg->priv->editor,
						       GEDIT_SETTINGS_SCHEME,
						       real_new_id);
			}
		}

		g_free (id);
		g_free (name);
	}
}

static void
scheme_description_cell_data_func (GtkTreeViewColumn *column,
				   GtkCellRenderer   *renderer,
				   GtkTreeModel      *model,
				   GtkTreeIter       *iter,
				   gpointer           data)
{
	gchar *name;
	gchar *desc;
	gchar *text;

	gtk_tree_model_get (model, iter,
			    NAME_COLUMN, &name,
			    DESC_COLUMN, &desc,
			    -1);

	if (desc != NULL)
	{
		text = g_markup_printf_escaped ("<b>%s</b> - %s",
						name,
						desc);
	}
	else
	{
		text = g_markup_printf_escaped ("<b>%s</b>",
						name);
	}

	g_free (name);
	g_free (desc);

	g_object_set (G_OBJECT (renderer),
		      "markup",
		      text,
		      NULL);

	g_free (text);
}

static void
setup_font_colors_page_style_scheme_section (GeditPreferencesDialog *dlg)
{
	GtkCellRenderer *renderer;
	GtkTreeViewColumn *column;
	GtkTreeSelection *selection;
	GtkStyleContext *context;
	const gchar *def_id;
	
	gedit_debug (DEBUG_PREFS);
			  
	/* Create GtkListStore for styles & setup treeview. */
	dlg->priv->schemes_treeview_model = gtk_list_store_new (NUM_COLUMNS,
								G_TYPE_STRING,
								G_TYPE_STRING,
								G_TYPE_STRING,
								G_TYPE_STRING);

	gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (dlg->priv->schemes_treeview_model),
					      0,
					      GTK_SORT_ASCENDING);
	gtk_tree_view_set_model (GTK_TREE_VIEW (dlg->priv->schemes_treeview),
				 GTK_TREE_MODEL (dlg->priv->schemes_treeview_model));

	column = gtk_tree_view_column_new ();

	renderer = gtk_cell_renderer_text_new ();
	g_object_set (renderer, "ellipsize", PANGO_ELLIPSIZE_END, NULL);
	gtk_tree_view_column_pack_start (column, renderer, TRUE);
	gtk_tree_view_column_set_cell_data_func (column,
						 renderer,
						 scheme_description_cell_data_func,
						 dlg,
						 NULL);

	gtk_tree_view_append_column (GTK_TREE_VIEW (dlg->priv->schemes_treeview),
				     column);

	selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (dlg->priv->schemes_treeview));
	gtk_tree_selection_set_mode (selection, GTK_SELECTION_BROWSE);

	def_id = populate_color_scheme_list (dlg, NULL);

	/* junction between the scrolled window and the toolbar */
	context = gtk_widget_get_style_context (dlg->priv->schemes_scrolled_window);
	gtk_style_context_set_junction_sides (context, GTK_JUNCTION_BOTTOM);
	context = gtk_widget_get_style_context (dlg->priv->schemes_toolbar);
	gtk_style_context_set_junction_sides (context, GTK_JUNCTION_TOP);

	/* Connect signals */
	g_signal_connect (dlg->priv->schemes_treeview,
			  "cursor-changed",
			  G_CALLBACK (style_scheme_changed),
			  dlg);
	g_signal_connect (dlg->priv->install_scheme_button,
			  "clicked",
			  G_CALLBACK (install_scheme_clicked),
			  dlg);
	g_signal_connect (dlg->priv->uninstall_scheme_button,
			  "clicked",
			  G_CALLBACK (uninstall_scheme_clicked),
			  dlg);
		
	/* Set initial widget sensitivity */
	set_buttons_sensisitivity_according_to_scheme (dlg, def_id);
}

static void
setup_font_colors_page (GeditPreferencesDialog *dlg)
{
	setup_font_colors_page_font_section (dlg);
	setup_font_colors_page_style_scheme_section (dlg);
}

static void
setup_plugins_page (GeditPreferencesDialog *dlg)
{
	GtkWidget *page_content;

	gedit_debug (DEBUG_PREFS);

	page_content = peas_gtk_plugin_manager_new (NULL);
	g_return_if_fail (page_content != NULL);

	gtk_box_pack_start (GTK_BOX (dlg->priv->plugin_manager_place_holder),
			    page_content,
			    TRUE,
			    TRUE,
			    0);

	gtk_widget_show_all (page_content);
}

static void
gedit_preferences_dialog_init (GeditPreferencesDialog *dlg)
{
	GtkBuilder *builder;
	gchar *root_objects[] = {
		"notebook",
		"adjustment1",
		"adjustment2",
		"adjustment3",
		NULL
	};

	gedit_debug (DEBUG_PREFS);

	dlg->priv = GEDIT_PREFERENCES_DIALOG_GET_PRIVATE (dlg);
	
	dlg->priv->editor = g_settings_new ("org.gnome.gedit.preferences.editor");

	gtk_dialog_add_buttons (GTK_DIALOG (dlg),
				GTK_STOCK_CLOSE,
				GTK_RESPONSE_CLOSE,
				GTK_STOCK_HELP,
				GTK_RESPONSE_HELP,
				NULL);

	gtk_window_set_title (GTK_WINDOW (dlg), _("gedit Preferences"));
	gtk_window_set_resizable (GTK_WINDOW (dlg), FALSE);
	gtk_window_set_destroy_with_parent (GTK_WINDOW (dlg), TRUE);

	/* HIG defaults */
	gtk_container_set_border_width (GTK_CONTAINER (dlg), 5);
	gtk_box_set_spacing (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dlg))), 2); /* 2 * 5 + 2 = 12 */
	gtk_container_set_border_width (GTK_CONTAINER (gtk_dialog_get_action_area (GTK_DIALOG (dlg))), 5);
	gtk_box_set_spacing (GTK_BOX (gtk_dialog_get_action_area (GTK_DIALOG (dlg))), 6);
	
	g_signal_connect (dlg,
			  "response",
			  G_CALLBACK (dialog_response_handler),
			  NULL);

	builder = gtk_builder_new ();
	gtk_builder_add_objects_from_resource (builder, "/org/gnome/gedit/ui/gedit-preferences-dialog.ui",
	                                       root_objects, NULL);
	dlg->priv->notebook = GTK_WIDGET (gtk_builder_get_object (builder, "notebook"));
	g_object_ref (dlg->priv->notebook);
	dlg->priv->display_line_numbers_checkbutton =
		GTK_WIDGET (gtk_builder_get_object (builder, "display_line_numbers_checkbutton"));
	dlg->priv->right_margin_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "right_margin_checkbutton"));
	dlg->priv->right_margin_position_spinbutton =
		GTK_WIDGET (gtk_builder_get_object (builder, "right_margin_position_spinbutton"));
	dlg->priv->highlight_current_line_checkbutton =
		GTK_WIDGET (gtk_builder_get_object (builder, "highlight_current_line_checkbutton"));
	dlg->priv->bracket_matching_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "bracket_matching_checkbutton"));
	dlg->priv->wrap_text_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "wrap_text_checkbutton"));
	dlg->priv->split_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "split_checkbutton"));
	dlg->priv->tabs_width_spinbutton = GTK_WIDGET (gtk_builder_get_object (builder, "tabs_width_spinbutton"));
	dlg->priv->tabs_width_hbox = GTK_WIDGET (gtk_builder_get_object (builder, "tabs_width_hbox"));
	dlg->priv->insert_spaces_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "insert_spaces_checkbutton"));
	dlg->priv->auto_indent_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "auto_indent_checkbutton"));
	dlg->priv->autosave_hbox = GTK_WIDGET (gtk_builder_get_object (builder, "autosave_hbox"));
	dlg->priv->backup_copy_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "backup_copy_checkbutton"));
	dlg->priv->auto_save_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "auto_save_checkbutton"));
	dlg->priv->auto_save_spinbutton = GTK_WIDGET (gtk_builder_get_object (builder, "auto_save_spinbutton"));
	dlg->priv->default_font_checkbutton = GTK_WIDGET (gtk_builder_get_object (builder, "default_font_checkbutton"));
	dlg->priv->font_button = GTK_WIDGET (gtk_builder_get_object (builder, "font_button"));
	dlg->priv->font_hbox = GTK_WIDGET (gtk_builder_get_object (builder, "font_hbox"));
	dlg->priv->schemes_treeview = GTK_WIDGET (gtk_builder_get_object (builder, "schemes_treeview"));
	dlg->priv->schemes_scrolled_window = GTK_WIDGET (gtk_builder_get_object (builder, "schemes-scrolled-window"));
	dlg->priv->install_scheme_button = GTK_WIDGET (gtk_builder_get_object (builder, "install_scheme_button"));
	dlg->priv->uninstall_scheme_button = GTK_WIDGET (gtk_builder_get_object (builder, "uninstall_scheme_button"));
	dlg->priv->schemes_toolbar = GTK_WIDGET (gtk_builder_get_object (builder, "schemes-toolbar"));
	dlg->priv->plugin_manager_place_holder = GTK_WIDGET (gtk_builder_get_object (builder, "plugin_manager_place_holder"));
	g_object_unref (builder);

	gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dlg))),
			    dlg->priv->notebook, FALSE, FALSE, 0);
	g_object_unref (dlg->priv->notebook);
	gtk_container_set_border_width (GTK_CONTAINER (dlg->priv->notebook), 5);

	setup_editor_page (dlg);
	setup_view_page (dlg);
	setup_font_colors_page (dlg);
	setup_plugins_page (dlg);
}

void
gedit_show_preferences_dialog (GeditWindow *parent)
{
	gedit_debug (DEBUG_PREFS);

	g_return_if_fail (GEDIT_IS_WINDOW (parent));

	if (preferences_dialog == NULL)
	{
		preferences_dialog = GTK_WIDGET (g_object_new (GEDIT_TYPE_PREFERENCES_DIALOG, NULL));
		g_signal_connect (preferences_dialog,
				  "destroy",
				  G_CALLBACK (gtk_widget_destroyed),
				  &preferences_dialog);
	}

	if (GTK_WINDOW (parent) != gtk_window_get_transient_for (GTK_WINDOW (preferences_dialog)))
	{
		gtk_window_set_transient_for (GTK_WINDOW (preferences_dialog),
					      GTK_WINDOW (parent));
	}

	gtk_window_present (GTK_WINDOW (preferences_dialog));
}

/* ex:set ts=8 noet: */
