path: root/calendar/gui/tasks-migrate.c

/* Evolution calendar - Migrate tasks from the calendar folder to the tasks folder
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Authors: Federico Mena-Quintero <federico@ximian.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnome.h>
#include <cal-client/cal-client.h>
#include "component-factory.h"
#include "tasks-migrate.h"



/* Client for the calendar folder */
static CalClient *calendar_client = NULL;

/* Client for the tasks folder */
static CalClient *tasks_client = NULL;

/* Whether we have done the migration yet */
static gboolean migrated = FALSE;



/* Performs the actual migration process */
static void
migrate (void)
{
    GList *uids;
    GList *l;
    gboolean success;
    gboolean at_least_one;

    g_assert (calendar_client != NULL);
    g_assert (tasks_client != NULL);
    g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);
    g_assert (cal_client_get_load_state (tasks_client) == CAL_CLIENT_LOAD_LOADED);

    uids = cal_client_get_uids (calendar_client, CALOBJ_TYPE_TODO);

    success = TRUE;
    at_least_one = FALSE;

    for (l = uids; l; l = l->next) {
        const char *uid;
        CalComponent *comp;
        CalClientGetStatus status;

        at_least_one = TRUE;

        uid = l->data;
        status = cal_client_get_object (calendar_client, uid, &comp);

        switch (status) {
        case CAL_CLIENT_GET_SUCCESS:
            if (cal_client_update_object (tasks_client, comp))
                cal_client_remove_object (calendar_client, uid);
            else
                success = FALSE;

            gtk_object_unref (GTK_OBJECT (comp));
            break;

        case CAL_CLIENT_GET_NOT_FOUND:
            /* This is OK; the object may have disappeared from the server */
            break;

        case CAL_CLIENT_GET_SYNTAX_ERROR:
            success = FALSE;
            break;

        default:
            g_assert_not_reached ();
        }
    }

    cal_obj_uid_list_free (uids);

    if (!at_least_one)
        return;

    if (success)
        gnome_ok_dialog (_("Evolution has taken the tasks that were in your calendar folder "
                   "and automatically migrated them to the new tasks folder."));
    else
        gnome_ok_dialog (_("Evolution has tried to take the tasks that were in your "
                   "calendar folder and migrate them to the new tasks folder.\n"
                   "Some of the tasks could not be migrated, so "
                   "this process may be attempted again in the future."));
}

/* Displays an error to indicate that a calendar could not be opened */
static void
open_error (const char *uri)
{
    char *msg;

    msg = g_strdup_printf (_("Could not open `%s'; no items from the calendar folder "
                 "will be migrated to the tasks folder."),
                 uri);
    gnome_error_dialog (msg);
    g_free (msg);
}

/* Displays an error to indicate that a URI method is not supported */
static void
method_error (const char *uri)
{
    char *msg;

    msg = g_strdup_printf (_("The method required to load `%s' is not supported; "
                 "no items from the calendar folder will be migrated "
                 "to the tasks folder."),
                   uri);
    gnome_error_dialog (msg);
    g_free (msg);
}

/* Callback used when the tasks client is finished loading */
static void
tasks_opened_cb (CalClient *client, CalClientOpenStatus status, gpointer data)
{
    g_assert (calendar_client != NULL);
    g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);

    switch (status) {
    case CAL_CLIENT_OPEN_SUCCESS:
        migrate ();
        break;

    case CAL_CLIENT_OPEN_ERROR:
        open_error (cal_client_get_uri (client));
        migrated = FALSE;
        break;

    case CAL_CLIENT_OPEN_NOT_FOUND:
        /* This can't happen because we did not specify only_if_exists when
         * issuing the open request.
         */
        g_assert_not_reached ();
        break;

    case CAL_CLIENT_OPEN_METHOD_NOT_SUPPORTED:
        method_error (cal_client_get_uri (client));
        migrated = FALSE;
        break;

    default:
        g_assert_not_reached ();
    }

    gtk_object_unref (GTK_OBJECT (calendar_client));
    calendar_client = NULL;

    gtk_object_unref (GTK_OBJECT (tasks_client));
    tasks_client = NULL;
}

/* Initiates the loading process for the tasks client */
static gboolean
load_tasks_client (void)
{
    char *uri;
    gboolean success;

    g_assert (calendar_client != NULL);
    g_assert (cal_client_get_load_state (calendar_client) == CAL_CLIENT_LOAD_LOADED);

    tasks_client = cal_client_new ();
    if (!tasks_client)
        goto error;

    gtk_signal_connect (GTK_OBJECT (tasks_client), "cal_opened",
                GTK_SIGNAL_FUNC (tasks_opened_cb),
                NULL);

    uri = g_strdup_printf ("%s/local/Tasks/tasks.ics", evolution_dir);
    success = cal_client_open_calendar (tasks_client, uri, FALSE);
    g_free (uri);

    if (success)
        return TRUE;

 error:
    g_message ("load_tasks_client(): could not issue open request for the tasks client");

    if (tasks_client) {
        gtk_object_unref (GTK_OBJECT (tasks_client));
        tasks_client = NULL;
    }

    return FALSE;
}

/* Callback used when the calendar client finishes loading */
static void
calendar_opened_cb (CalClient *client, CalClientOpenStatus status, gpointer data)
{
    switch (status) {
    case CAL_CLIENT_OPEN_SUCCESS:
        if (!load_tasks_client ()) {
            migrated = FALSE;
            break;
        }

        return;

    case CAL_CLIENT_OPEN_ERROR:
        open_error (cal_client_get_uri (client));
        migrated = FALSE;
        break;

    case CAL_CLIENT_OPEN_NOT_FOUND:
        /* This is OK; the calendar folder did not exist in the first
         * place so there is nothing to migrate.
         */
        break;

    case CAL_CLIENT_OPEN_METHOD_NOT_SUPPORTED:
        method_error (cal_client_get_uri (client));
        migrated = FALSE;
        break;

    default:
        g_assert_not_reached ();
    }

    gtk_object_unref (GTK_OBJECT (calendar_client));
    calendar_client = NULL;
}

/* Initiates the loading process for the calendar client */
static gboolean
load_calendar_client (void)
{
    char *uri;
    gboolean success;

    /* First we load the calendar client; the tasks client will be loaded
     * later only if the former one succeeds.
     */

    calendar_client = cal_client_new ();
    if (!calendar_client)
        goto error;

    gtk_signal_connect (GTK_OBJECT (calendar_client), "cal_opened",
                GTK_SIGNAL_FUNC (calendar_opened_cb),
                NULL);

    uri = g_strdup_printf ("%s/local/Calendar/calendar.ics", evolution_dir);
    success = cal_client_open_calendar (calendar_client, uri, TRUE);
    g_free (uri);

    if (success)
        return TRUE;

 error:
    g_message ("load_calendar_client(): could not issue open request for the calendar client");

    if (calendar_client) {
        gtk_object_unref (GTK_OBJECT (calendar_client));
        calendar_client = NULL;
    }

    return FALSE;
}

/**
 * tasks_migrate:
 *
 * Initiates the asynchronous process that migrates the tasks from the default
 * user calendar folder to the default tasks folder.  This is because Evolution
 * used to store tasks in the same folder as the calendar by default, but they
 * are separate folders now.
 **/
void
tasks_migrate (void)
{
    g_assert (!migrated);
    migrated = TRUE;

    if (!load_calendar_client ())
        migrated = FALSE;
}