/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* NetworkManager Connection editor -- Connection editor for NetworkManager
 *
 * Dan Williams <dcbw@redhat.com>
 *
 * 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.
 *
 * Copyright 2008 - 2017 Red Hat, Inc.
 */

#include "nm-default.h"

#include <string.h>
#include <gmodule.h>

#include "vpn-helpers.h"
#include "utils.h"

NMVpnEditorPlugin *
vpn_get_plugin_by_service (const char *service)
{
	NMVpnPluginInfo *plugin_info;

	plugin_info = nm_vpn_plugin_info_list_find_by_service (vpn_get_plugin_infos (), service);
	if (plugin_info)
		return nm_vpn_plugin_info_get_editor_plugin (plugin_info);
	return NULL;
}

static gint
_sort_vpn_plugins (NMVpnPluginInfo *aa, NMVpnPluginInfo *bb)
{
	return strcmp (nm_vpn_plugin_info_get_name (aa), nm_vpn_plugin_info_get_name (bb));
}

GSList *
vpn_get_plugin_infos (void)
{
	static gboolean plugins_loaded = FALSE;
	static GSList *plugins = NULL;
	GSList *p;

	if (G_LIKELY (plugins_loaded))
		return plugins;
	plugins_loaded = TRUE;

	p = nm_vpn_plugin_info_list_load ();
	plugins = NULL;
	while (p) {
		NMVpnPluginInfo *plugin_info = NM_VPN_PLUGIN_INFO (p->data);
		GError *error = NULL;

		/* load the editor plugin, and preserve only those NMVpnPluginInfo that can
		 * successfully load the plugin. */
		if (nm_vpn_plugin_info_load_editor_plugin (plugin_info, &error)) {
			plugins = g_slist_prepend (plugins, plugin_info);
			g_info ("vpn: (%s,%s) loaded",
			        nm_vpn_plugin_info_get_name (plugin_info),
			        nm_vpn_plugin_info_get_filename (plugin_info));
		} else {
			if (   !nm_vpn_plugin_info_get_plugin (plugin_info)
			    && nm_vpn_plugin_info_lookup_property (plugin_info, NM_VPN_PLUGIN_INFO_KF_GROUP_GNOME, "properties")) {
				g_message ("vpn: (%s,%s) cannot load legacy-only plugin",
				           nm_vpn_plugin_info_get_name (plugin_info),
				           nm_vpn_plugin_info_get_filename (plugin_info));
			} else if (g_error_matches (error, G_FILE_ERROR, G_FILE_ERROR_NOENT)) {
				g_message ("vpn: (%s,%s) file \"%s\" not found. Did you install the client package?",
				           nm_vpn_plugin_info_get_name (plugin_info),
				           nm_vpn_plugin_info_get_filename (plugin_info),
				           nm_vpn_plugin_info_get_plugin (plugin_info));
			} else {
				g_warning ("vpn: (%s,%s) could not load plugin: %s",
				           nm_vpn_plugin_info_get_name (plugin_info),
				           nm_vpn_plugin_info_get_filename (plugin_info),
				           error->message);
			}
			g_clear_error (&error);
			g_object_unref (plugin_info);
		}
		p = g_slist_delete_link (p, p);
	}

	/* sort the list of plugins alphabetically. */
	plugins = g_slist_sort (plugins, (GCompareFunc) _sort_vpn_plugins);
	return plugins;
}

static void
export_vpn_to_file_cb (GtkWidget *dialog, gint response, gpointer user_data)
{
	NMConnection *connection = NM_CONNECTION (user_data);
	char *filename = NULL;
	GError *error = NULL;
	NMVpnEditorPlugin *plugin;
	NMSettingConnection *s_con = NULL;
	NMSettingVpn *s_vpn = NULL;
	const char *service_type;
	const char *id = NULL;
	gboolean success = FALSE;

	if (response != GTK_RESPONSE_ACCEPT)
		goto out;

	filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
	if (!filename) {
		g_set_error (&error, NMA_ERROR, NMA_ERROR_GENERIC, "no filename");
		goto done;
	}

	if (g_file_test (filename, G_FILE_TEST_EXISTS)) {
		int replace_response;
		GtkWidget *replace_dialog;
		char *bname;

		bname = g_path_get_basename (filename);
		replace_dialog = gtk_message_dialog_new (NULL,
		                                         GTK_DIALOG_DESTROY_WITH_PARENT,
		                                         GTK_MESSAGE_QUESTION,
		                                         GTK_BUTTONS_CANCEL,
		                                         _("A file named “%s” already exists."),
		                                         bname);
		gtk_dialog_add_buttons (GTK_DIALOG (replace_dialog), _("_Replace"), GTK_RESPONSE_OK, NULL);
		gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (replace_dialog),
							  _("Do you want to replace %s with the VPN connection you are saving?"), bname);
		g_free (bname);
		replace_response = gtk_dialog_run (GTK_DIALOG (replace_dialog));
		gtk_widget_destroy (replace_dialog);
		if (replace_response != GTK_RESPONSE_OK)
			goto out;
	}

	s_con = nm_connection_get_setting_connection (connection);
	id = s_con ? nm_setting_connection_get_id (s_con) : NULL;
	if (!id) {
		g_set_error (&error, NMA_ERROR, NMA_ERROR_GENERIC, "connection setting invalid");
		goto done;
	}

	s_vpn = nm_connection_get_setting_vpn (connection);
	service_type = s_vpn ? nm_setting_vpn_get_service_type (s_vpn) : NULL;

	if (!service_type) {
		g_set_error (&error, NMA_ERROR, NMA_ERROR_GENERIC, "VPN setting invalid");
		goto done;
	}

	plugin = vpn_get_plugin_by_service (service_type);
	if (plugin)
		success = nm_vpn_editor_plugin_export (plugin, filename, connection, &error);

done:
	if (!success) {
		GtkWidget *err_dialog;
		char *bname = filename ? g_path_get_basename (filename) : g_strdup ("(none)");

		err_dialog = gtk_message_dialog_new (NULL,
		                                     GTK_DIALOG_DESTROY_WITH_PARENT,
		                                     GTK_MESSAGE_ERROR,
		                                     GTK_BUTTONS_OK,
		                                     _("Cannot export VPN connection"));
		gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (err_dialog),
		                                 _("The VPN connection “%s” could not be exported to %s.\n\nError: %s."),
		                                 id ? id : "(unknown)", bname, error ? error->message : "unknown error");
		g_free (bname);
		g_signal_connect (err_dialog, "delete-event", G_CALLBACK (gtk_widget_destroy), NULL);
		g_signal_connect (err_dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);
		gtk_widget_show_all (err_dialog);
		gtk_window_present (GTK_WINDOW (err_dialog));
	}

out:
	if (error)
		g_error_free (error);
	g_object_unref (connection);

	gtk_widget_hide (dialog);
	gtk_widget_destroy (dialog);
}

void
vpn_export (NMConnection *connection)
{
	GtkWidget *dialog;
	NMVpnEditorPlugin *plugin;
	NMSettingVpn *s_vpn = NULL;
	const char *service_type;
	const char *home_folder;

	s_vpn = nm_connection_get_setting_vpn (connection);
	service_type = s_vpn ? nm_setting_vpn_get_service_type (s_vpn) : NULL;

	if (!service_type) {
		g_warning ("%s: invalid VPN connection!", __func__);
		return;
	}

	dialog = gtk_file_chooser_dialog_new (_("Export VPN connection…"),
	                                      NULL,
	                                      GTK_FILE_CHOOSER_ACTION_SAVE,
	                                      _("_Cancel"), GTK_RESPONSE_CANCEL,
	                                      _("_Save"), GTK_RESPONSE_ACCEPT,
	                                      NULL);
	home_folder = g_get_home_dir ();
	gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), home_folder);

	plugin = vpn_get_plugin_by_service (service_type);
	if (plugin) {
		char *suggested = NULL;

		suggested = nm_vpn_editor_plugin_get_suggested_filename (plugin, connection);
		if (suggested) {
			gtk_file_chooser_set_current_name (GTK_FILE_CHOOSER (dialog), suggested);
			g_free (suggested);
		}
	}

	g_signal_connect (G_OBJECT (dialog), "response", G_CALLBACK (export_vpn_to_file_cb), g_object_ref (connection));
	gtk_widget_show_all (dialog);
	gtk_window_present (GTK_WINDOW (dialog));
}

gboolean
vpn_supports_ipv6 (NMConnection *connection)
{
	NMSettingVpn *s_vpn;
	const char *service_type;
	NMVpnEditorPlugin *plugin;
	guint32 capabilities;

	s_vpn = nm_connection_get_setting_vpn (connection);
	g_return_val_if_fail (s_vpn != NULL, FALSE);

	service_type = nm_setting_vpn_get_service_type (s_vpn);
	g_return_val_if_fail (service_type != NULL, FALSE);

	plugin = vpn_get_plugin_by_service (service_type);
	if (!plugin)
		return FALSE;

	capabilities = nm_vpn_editor_plugin_get_capabilities (plugin);
	return (capabilities & NM_VPN_EDITOR_PLUGIN_CAPABILITY_IPV6) != 0;
}

