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/*
 * 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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Damon Chaplin <damon@ximian.com>
 *      Rodrigo Moya <rodrigo@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/*
 * calendar-config.c - functions to load/save/get/set user settings.
 */

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

#include <time.h>
#include <string.h>
#include <gio/gio.h>
#include <e-util/e-util.h>
#include <libecal/e-cal-time-util.h>
#include <libedataserver/e-data-server-util.h>
#include <widgets/e-timezone-dialog/e-timezone-dialog.h>
#include <shell/e-shell.h>

#include "calendar-config-keys.h"
#include "calendar-config.h"

static GSettings *config = NULL;

static void
do_cleanup (void)
{
    g_object_unref (config);
    config = NULL;
}

static void
calendar_config_init (void)
{
    if (config)
        return;

    config = g_settings_new ("org.gnome.evolution.calendar");
    g_atexit ((GVoidFunc) do_cleanup);
}

void
calendar_config_remove_notification (guint id)
{
    calendar_config_init ();

    gconf_client_notify_remove (config, id);
}

/* Returns TRUE if the locale has 'am' and 'pm' strings defined, in which
 * case the user can choose between 12 and 24-hour time formats. */
gboolean
calendar_config_locale_supports_12_hour_format (void)
{
    gchar s[16];
    time_t t = 0;

    calendar_config_init ();

    e_utf8_strftime (s, sizeof s, "%p", gmtime (&t));
    return s[0] != '\0';
}

/*
 * Calendar Settings.
 */

static gchar *
calendar_config_get_timezone_stored (void)
{
    calendar_config_init ();

    return g_settings_get_string (config, "timezone");
}

static gchar *
calendar_config_get_timezone (void)
{
    EShell *shell;
    EShellSettings *shell_settings;
    gboolean use_system_timezone;

    shell = e_shell_get_default ();
    shell_settings = e_shell_get_shell_settings (shell);

    use_system_timezone = e_shell_settings_get_boolean (
        shell_settings, "cal-use-system-timezone");

    if (use_system_timezone)
        return e_cal_util_get_system_timezone_location ();

    return calendar_config_get_timezone_stored ();
}

icaltimezone *
calendar_config_get_icaltimezone (void)
{
    gchar *location;
    icaltimezone *zone = NULL;

    calendar_config_init ();

    location = calendar_config_get_timezone ();
    if (location) {
        zone = icaltimezone_get_builtin_timezone (location);

        g_free (location);
    }
    return zone;
}

/* Whether we use 24-hour format or 12-hour format (AM/PM). */
gboolean
calendar_config_get_24_hour_format (void)
{
    calendar_config_init ();

    /* If the locale defines 'am' and 'pm' strings then the user has the
     * choice of 12-hour or 24-hour time format, with 12-hour as the
     * default. If the locale doesn't have 'am' and 'pm' strings we have
     * to use 24-hour format, or strftime ()/strptime () won't work. */
    if (calendar_config_locale_supports_12_hour_format ())
        return g_settings_get_boolean (config, "use-24hour-format");

    return TRUE;
}

/* Scroll in a month view by a week, not by a month */
gboolean
calendar_config_get_month_scroll_by_week (void)
{
    calendar_config_init ();

    return g_settings_get_boolean (config, "month-scroll-by-week");
}

guint
calendar_config_add_notification_month_scroll_by_week (GConfClientNotifyFunc func,
                                                       gpointer data)
{
    guint id;

    calendar_config_init ();

    id = gconf_client_notify_add (config, CALENDAR_CONFIG_MONTH_SCROLL_BY_WEEK, func, data, NULL, NULL);

    return id;
}

/***************************************/

/* The working days of the week, a bit-wise combination of flags. */
CalWeekdays
calendar_config_get_working_days (void)
{
    calendar_config_init ();

    return g_settings_get_int (config, "working-days");
}

/* Settings to hide completed tasks. */
gboolean
calendar_config_get_hide_completed_tasks (void)
{
    calendar_config_init ();

    return g_settings_get_boolean (config, "hide-completed-tasks");
}

static EDurationType
calendar_config_get_hide_completed_tasks_units (void)
{
    gchar *units;
    EDurationType cu;

    calendar_config_init ();

    units = g_settings_get_string (config, "hide-completed-tasks-units");

    if (units && !strcmp (units, "minutes"))
        cu = E_DURATION_MINUTES;
    else if (units && !strcmp (units, "hours"))
        cu = E_DURATION_HOURS;
    else
        cu = E_DURATION_DAYS;

    g_free (units);

    return cu;
}

/**
 * calendar_config_get_hide_completed_tasks_sexp:
 *
 * @get_completed: Whether to form subexpression that
 * gets completed or not completed tasks.
 * Returns the subexpression to use to filter out completed tasks according
 * to the config settings. The returned sexp should be freed.
 **/
gchar *
calendar_config_get_hide_completed_tasks_sexp (gboolean get_completed)
{
    gchar *sexp = NULL;

    if (calendar_config_get_hide_completed_tasks ()) {
        EDurationType units;
        gint value;

        units = calendar_config_get_hide_completed_tasks_units ();
        value = g_settings_get_int (config, "hide-completed-tasks-value");

        if (value == 0) {
            /* If the value is 0, we want to hide completed tasks
             * immediately, so we filter out all complete/incomplete tasks.*/
            if (!get_completed)
                sexp = g_strdup ("(not is-completed?)");
            else
                sexp = g_strdup ("(is-completed?)");
        } else {
            gchar *isodate;
            icaltimezone *zone;
            struct icaltimetype tt;
            time_t t;

            /* Get the current time, and subtract the appropriate
             * number of days/hours/minutes. */
            zone = calendar_config_get_icaltimezone ();
            tt = icaltime_current_time_with_zone (zone);

            switch (units) {
            case E_DURATION_DAYS:
                icaltime_adjust (&tt, -value, 0, 0, 0);
                break;
            case E_DURATION_HOURS:
                icaltime_adjust (&tt, 0, -value, 0, 0);
                break;
            case E_DURATION_MINUTES:
                icaltime_adjust (&tt, 0, 0, -value, 0);
                break;
            default:
                g_return_val_if_reached (NULL);
            }

            t = icaltime_as_timet_with_zone (tt, zone);

            /* Convert the time to an ISO date string, and build
             * the query sub-expression. */
            isodate = isodate_from_time_t (t);
            if (!get_completed)
                sexp = g_strdup_printf ("(not (completed-before? (make-time \"%s\")))", isodate);
            else
                sexp = g_strdup_printf ("(completed-before? (make-time \"%s\"))", isodate);
            g_free (isodate);
        }
    }

    return sexp;
}

void
calendar_config_set_dir_path (const gchar *path)
{
    calendar_config_init ();

    g_settings_set_string (config, "audio-dir", path);
}

gchar *
calendar_config_get_dir_path (void)
{
    gchar *path;

    calendar_config_init ();

    path = g_settings_get_string (config, "audio-dir");

    return path;
}

/* contains list of strings, locations, recently used as the second timezone in a day view.
 * Free with calendar_config_free_day_second_zones. */
GSList *
calendar_config_get_day_second_zones (void)
{
    GSList *res = NULL;
    gchar **strv;
    gint i;

    calendar_config_init ();

    strv = g_settings_get_strv (config, "day-second-zones");
    for (i = 0; i < g_strv_length (strv); i++) {
        if (strv[i] != NULL)
            res = g_slist_append (res, g_strdup (strv[i]));
    }

    g_strfreev (strv);

    return res;
}

/* frees list from calendar_config_get_day_second_zones */
void
calendar_config_free_day_second_zones (GSList *zones)
{
    if (zones) {
        g_slist_foreach (zones, (GFunc) g_free, NULL);
        g_slist_free (zones);
    }
}

/* keeps max 'day_second_zones_max' zones, if 'location' is already in a list, then it'll became first there */
void
calendar_config_set_day_second_zone (const gchar *location)
{
    calendar_config_init ();

    if (location && *location) {
        GSList *lst, *l;
        gint max_zones;
        GPtrArray *array;
        gint i;

        /* configurable max number of timezones to remember */
        max_zones = g_settings_get_int (config, "day-second-zones-max");

        if (max_zones <= 0)
            max_zones = 5;

        lst = calendar_config_get_day_second_zones ();
        for (l = lst; l; l = l->next) {
            if (l->data && g_str_equal (l->data, location)) {
                if (l != lst) {
                    /* isn't first in the list */
                    gchar *val = l->data;

                    lst = g_slist_remove (lst, val);
                    lst = g_slist_prepend (lst, val);
                }
                break;
            }
        }

        if (!l) {
            /* not in the list yet */
            lst = g_slist_prepend (lst, g_strdup (location));
        }

        array = g_ptr_array_new ();
        for (i = 0, l = lst; i < max_zones && l != NULL; i++, l = l->next)
            g_ptr_array_add (array, l->data);

        g_settings_set_strv (config, "day-second-zones", array->pdata);

        calendar_config_free_day_second_zones (lst);
        g_ptr_array_free (array, FALSE);
    }

    g_settings_set_string (config, "day-second-zone", location ? location : "");
}

/* location of the second time zone user has selected. Free with g_free. */
gchar *
calendar_config_get_day_second_zone (void)
{
    calendar_config_init ();

    return g_settings_get_string (config, "day-second-zone");
}

void
calendar_config_select_day_second_zone (void)
{
    icaltimezone *zone = NULL;
    ETimezoneDialog *tzdlg;
    GtkWidget *dialog;
    gchar *second_location;

    second_location = calendar_config_get_day_second_zone ();
    if (second_location && *second_location)
        zone = icaltimezone_get_builtin_timezone (second_location);
    g_free (second_location);

    if (!zone)
        zone = calendar_config_get_icaltimezone ();

    tzdlg = e_timezone_dialog_new ();
    e_timezone_dialog_set_timezone (tzdlg, zone);

    dialog = e_timezone_dialog_get_toplevel (tzdlg);

    if (gtk_dialog_run (GTK_DIALOG (dialog)) == GTK_RESPONSE_ACCEPT) {
        const gchar *location = NULL;

        zone = e_timezone_dialog_get_timezone (tzdlg);
        if (zone == icaltimezone_get_utc_timezone ()) {
            location = "UTC";
        } else if (zone) {
            location = icaltimezone_get_location (zone);
        }

        calendar_config_set_day_second_zone (location);
    }

    g_object_unref (tzdlg);
}

guint
calendar_config_add_notification_day_second_zone (GConfClientNotifyFunc func,
                                                  gpointer data)
{
    guint id;

    calendar_config_init ();

    id = gconf_client_notify_add (config, CALENDAR_CONFIG_DAY_SECOND_ZONE, func, data, NULL, NULL);

    return id;
}