/*
 * evolution-backup-restore.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <config.h>
#include <unistd.h>
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#  include <sys/wait.h>
#endif
#include <stdlib.h>

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

#include <libebackend/libebackend.h>

#include <e-util/e-util.h>

#include <shell/e-shell-utils.h>
#include <shell/e-shell-window.h>

#include <mail/e-mail-config-assistant.h>

#include "e-mail-config-restore-page.h"
#include "e-mail-config-restore-ready-page.h"

#ifdef G_OS_WIN32
#ifdef localtime_r
#undef localtime_r
#endif
/* The localtime() in Microsoft's C library *is* thread-safe */
#define localtime_r(timep, result) \
	(localtime (timep) ? memcpy ( \
	(result), localtime (timep), sizeof (*(result))) : 0)
#endif

typedef EExtension EvolutionBackupRestoreAssistant;
typedef EExtensionClass EvolutionBackupRestoreAssistantClass;

typedef EExtension EvolutionBackupRestoreMenuItems;
typedef EExtensionClass EvolutionBackupRestoreMenuItemsClass;

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

/* Forward Declarations */
GType evolution_backup_restore_assistant_get_type (void);
GType evolution_backup_restore_menu_items_get_type (void);

static const gchar *ui =
"<ui>"
"  <menubar name='main-menu'>"
"    <menu action='file-menu'>"
"      <placeholder name='file-actions'>"
"        <menuitem action='settings-backup'/>"
"        <menuitem action='settings-restore'/>"
"      </placeholder>"
"    </menu>"
"  </menubar>"
"</ui>";

G_DEFINE_DYNAMIC_TYPE (
	EvolutionBackupRestoreAssistant,
	evolution_backup_restore_assistant,
	E_TYPE_EXTENSION)

G_DEFINE_DYNAMIC_TYPE (
	EvolutionBackupRestoreMenuItems,
	evolution_backup_restore_menu_items,
	E_TYPE_EXTENSION)

enum {
	BR_OK = 1 << 0,
	BR_START = 1 << 1
};

static void
backup (const gchar *filename,
        gboolean restart)
{
	if (restart)
		execl (
			EVOLUTION_TOOLSDIR "/evolution-backup",
			"evolution-backup",
			"--gui",
			"--backup",
			"--restart",
			filename,
			NULL);
	else
		execl (
			EVOLUTION_TOOLSDIR "/evolution-backup",
			"evolution-backup",
			"--gui",
			"--backup",
			filename,
			NULL);
}

static void
restore (const gchar *filename,
         gboolean restart)
{
	if (restart)
		execl (
			EVOLUTION_TOOLSDIR "/evolution-backup",
			"evolution-backup",
			"--gui",
			"--restore",
			"--restart",
			filename,
			NULL);
	else
		execl (
			EVOLUTION_TOOLSDIR "/evolution-backup",
			"evolution-backup",
			"--gui",
			"--restore",
			filename,
			NULL);
}

static guint32
dialog_prompt_user (GtkWindow *parent,
                    const gchar *string,
                    const gchar *tag,
                    ...)
{
	GtkWidget *dialog;
	GtkWidget *check = NULL;
	GtkWidget *container;
	va_list ap;
	gint button;
	guint32 mask = 0;
	EAlert *alert = NULL;

	va_start (ap, tag);
	alert = e_alert_new_valist (tag, ap);
	va_end (ap);

	dialog = e_alert_dialog_new (parent, alert);
	g_object_unref (alert);

	container = e_alert_dialog_get_content_area (E_ALERT_DIALOG (dialog));

	check = gtk_check_button_new_with_mnemonic (string);
	gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (check), TRUE);
	gtk_box_pack_start (GTK_BOX (container), check, FALSE, FALSE, 0);
	gtk_widget_show (check);

	button = gtk_dialog_run (GTK_DIALOG (dialog));

	if (button == GTK_RESPONSE_YES)
		mask |= BR_OK;
	if (gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (check)))
		mask |= BR_START;

	gtk_widget_destroy (dialog);

	return mask;
}

static void
set_local_only (GtkFileChooser *file_chooser)
{
	/* XXX Has to be a local file, since the backup utility
	 *     takes a filename argument, not a URI. */
	gtk_file_chooser_set_local_only (file_chooser, TRUE);
}

static gchar *
suggest_file_name (void)
{
	time_t t;
	struct tm tm;

	t = time (NULL);
	localtime_r (&t, &tm);

	return g_strdup_printf (
		"evolution-backup-%04d%02d%02d.tar.gz",
		tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
}

static void
action_settings_backup_cb (GtkAction *action,
                           EShellWindow *shell_window)
{
	GFile *file;
	GFile *parent;
	GFileInfo *file_info;
	const gchar *attribute;
	GError *error = NULL;
	gchar *suggest;

	suggest = suggest_file_name ();

	file = e_shell_run_save_dialog (
		e_shell_window_get_shell (shell_window),
		_("Select name of the Evolution backup file"),
		suggest, "*.tar.gz", (GtkCallback)
		set_local_only, NULL);

	g_free (suggest);

	if (file == NULL)
		return;

	/* Make sure the parent directory can be written to. */

	parent = g_file_get_parent (file);
	attribute = G_FILE_ATTRIBUTE_ACCESS_CAN_WRITE;

	/* XXX The query operation blocks the main loop but we
	 *     know it's a local file, so let it slide for now. */
	file_info = g_file_query_info (
		parent, attribute, G_FILE_QUERY_INFO_NONE, NULL, &error);

	g_object_unref (parent);

	if (error != NULL) {
		g_warning ("%s", error->message);
		g_error_free (error);
		return;
	}

	if (g_file_info_get_attribute_boolean (file_info, attribute)) {
		guint32 mask;
		gchar *path;

		mask = dialog_prompt_user (
			GTK_WINDOW (shell_window),
			_("_Restart Evolution after backup"),
			"org.gnome.backup-restore:backup-confirm", NULL);
		if (mask & BR_OK) {
			path = g_file_get_path (file);
			backup (path, (mask & BR_START) ? TRUE: FALSE);
			g_free (path);
		}
	} else {
		e_alert_run_dialog_for_args (
			GTK_WINDOW (shell_window),
			"org.gnome.backup-restore:insufficient-permissions",
			NULL);
	}

	g_object_unref (file_info);
	g_object_unref (file);
}

static void
action_settings_restore_cb (GtkAction *action,
                            EShellWindow *shell_window)
{
	GFile *file;
	gchar *path;

	file = e_shell_run_open_dialog (
		e_shell_window_get_shell (shell_window),
		_("Select name of the Evolution backup file to restore"),
		(GtkCallback) set_local_only, NULL);

	if (file == NULL)
		return;

	path = g_file_get_path (file);

	if (evolution_backup_restore_validate_backup_file (path)) {
		guint32 mask;

		mask = dialog_prompt_user (
			GTK_WINDOW (shell_window),
			_("_Restart Evolution after restore"),
			"org.gnome.backup-restore:restore-confirm", NULL);
		if (mask & BR_OK)
			restore (path, mask & BR_START);
	} else {
		e_alert_run_dialog_for_args (
			GTK_WINDOW (shell_window),
			"org.gnome.backup-restore:invalid-backup", NULL);
	}

	g_object_unref (file);
	g_free (path);
}

static GtkActionEntry entries[] = {

	{ "settings-backup",
	  NULL,
	  N_("_Back up Evolution Data..."),
	  NULL,
	  N_("Back up Evolution data and settings to an archive file"),
	  G_CALLBACK (action_settings_backup_cb) },

	{ "settings-restore",
	  NULL,
	  N_("R_estore Evolution Data..."),
	  NULL,
	  N_("Restore Evolution data and settings from an archive file"),
	  G_CALLBACK (action_settings_restore_cb) }
};

static gboolean
evolution_backup_restore_filename_to_visible (GBinding *binding,
                                              const GValue *source_value,
                                              GValue *target_value,
                                              gpointer unused)
{
	const gchar *filename;
	gboolean visible;

	filename = g_value_get_string (source_value);
	visible = (filename != NULL && *filename != '\0');
	g_value_set_boolean (target_value, visible);

	return TRUE;
}

static void
evolution_backup_restore_prepare_cb (GtkAssistant *assistant,
                                     GtkWidget *page,
                                     EMailConfigRestorePage *restore_page)
{
	const gchar *filename;

	/* If we've landed on the EMailConfigRestoreReadyPage, that
	 * means the user has chosen a valid backup file to restore
	 * so start the "evolution-backup" tool immediately. */

	filename = e_mail_config_restore_page_get_filename (restore_page);

	if (E_IS_MAIL_CONFIG_RESTORE_READY_PAGE (page))
		restore (filename, TRUE);
}

static void
evolution_backup_restore_assistant_constructed (GObject *object)
{
	EExtension *extension;
	EExtensible *extensible;
	EMailConfigAssistant *assistant;
	const gchar *type_name;

	extension = E_EXTENSION (object);
	extensible = e_extension_get_extensible (extension);

	/* Chain up to parent's constructed() method. */
	G_OBJECT_CLASS (evolution_backup_restore_assistant_parent_class)->
		constructed (object);

	assistant = E_MAIL_CONFIG_ASSISTANT (extensible);

	/* XXX We only want to add the EMailConfigRestorePage to an
	 *     EStartupAssistant instance, not a normal EMailConfigAssistant.
	 *     But EStartupAssistant is defined in the "startup-wizard" module
	 *     and we can't access its GType without knowing its type name, so
	 *     just hard-code the type name. */
	type_name = G_OBJECT_TYPE_NAME (assistant);
	if (g_strcmp0 (type_name, "EStartupAssistant") == 0) {
		EMailConfigPage *restore_page;
		EMailConfigPage *ready_page;

		restore_page = e_mail_config_restore_page_new ();
		e_mail_config_assistant_add_page (assistant, restore_page);

		ready_page = e_mail_config_restore_ready_page_new ();
		e_mail_config_assistant_add_page (assistant, ready_page);

		g_object_bind_property_full (
			restore_page, "filename",
			ready_page, "visible",
			G_BINDING_SYNC_CREATE,
			evolution_backup_restore_filename_to_visible,
			NULL,
			NULL, (GDestroyNotify) NULL);

		g_signal_connect (
			assistant, "prepare",
			G_CALLBACK (evolution_backup_restore_prepare_cb),
			restore_page);
	}
}

static void
evolution_backup_restore_assistant_class_init (EExtensionClass *class)
{
	GObjectClass *object_class;

	object_class = G_OBJECT_CLASS (class);
	object_class->constructed = evolution_backup_restore_assistant_constructed;

	class->extensible_type = E_TYPE_MAIL_CONFIG_ASSISTANT;
}

static void
evolution_backup_restore_assistant_class_finalize (EExtensionClass *class)
{
}

static void
evolution_backup_restore_assistant_init (EExtension *extension)
{
}

static void
evolution_backup_restore_menu_items_constructed (GObject *object)
{
	EExtension *extension;
	EExtensible *extensible;
	EShellWindow *shell_window;
	GtkActionGroup *action_group;
	GtkUIManager *ui_manager;
	GError *error = NULL;

	extension = E_EXTENSION (object);
	extensible = e_extension_get_extensible (extension);

	/* Chain up to parent's constructed() method. */
	G_OBJECT_CLASS (evolution_backup_restore_menu_items_parent_class)->
		constructed (object);

	shell_window = E_SHELL_WINDOW (extensible);
	action_group = e_shell_window_get_action_group (shell_window, "shell");

	/* Add actions to the "shell" action group. */
	gtk_action_group_add_actions (
		action_group, entries,
		G_N_ELEMENTS (entries), shell_window);

	/* Because we are loading from a hard-coded string, there is
	 * no chance of I/O errors.  Failure here implies a malformed
	 * UI definition.  Full stop. */
	ui_manager = e_shell_window_get_ui_manager (shell_window);
	gtk_ui_manager_add_ui_from_string (ui_manager, ui, -1, &error);
	if (error != NULL)
		g_error ("%s", error->message);
}

static void
evolution_backup_restore_menu_items_class_init (EExtensionClass *class)
{
	GObjectClass *object_class;
	EExtensionClass *extension_class;

	object_class = G_OBJECT_CLASS (class);
	object_class->constructed = evolution_backup_restore_menu_items_constructed;

	extension_class = E_EXTENSION_CLASS (class);
	extension_class->extensible_type = E_TYPE_SHELL_WINDOW;
}

static void
evolution_backup_restore_menu_items_class_finalize (EExtensionClass *class)
{
}

static void
evolution_backup_restore_menu_items_init (EExtension *extension)
{
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
	evolution_backup_restore_assistant_register_type (type_module);
	evolution_backup_restore_menu_items_register_type (type_module);

	e_mail_config_restore_page_type_register (type_module);
	e_mail_config_restore_ready_page_type_register (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}