path: root/calendar/gui/dialogs/recurrence-page.c

/* Evolution calendar - Recurrence page of the calendar component dialogs
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Authors: Federico Mena-Quintero <federico@ximian.com>
 *          Miguel de Icaza <miguel@ximian.com>
 *          Seth Alves <alves@hungry.com>
 *          JP Rosevear <jpr@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU 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 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 <gtk/gtkoptionmenu.h>
#include <gtk/gtksignal.h>
#include <gtk/gtkspinbutton.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <glade/glade.h>
#include <gal/widgets/e-unicode.h>
#include <e-util/e-dialog-widgets.h>
#include <e-util/e-time-utils.h>
#include <widgets/misc/e-dateedit.h>
#include <cal-util/timeutil.h>
#include "../calendar-config.h"
#include "../tag-calendar.h"
#include "../weekday-picker.h"
#include "comp-editor-util.h"
#include "recurrence-page.h"



enum month_day_options {
    MONTH_DAY_NTH,
    MONTH_DAY_MON,
    MONTH_DAY_TUE,
    MONTH_DAY_WED,
    MONTH_DAY_THU,
    MONTH_DAY_FRI,
    MONTH_DAY_SAT,
    MONTH_DAY_SUN
};

static const int month_day_options_map[] = {
    MONTH_DAY_NTH,
    MONTH_DAY_MON,
    MONTH_DAY_TUE,
    MONTH_DAY_WED,
    MONTH_DAY_THU,
    MONTH_DAY_FRI,
    MONTH_DAY_SAT,
    MONTH_DAY_SUN,
    -1
};

enum recur_type {
    RECUR_NONE,
    RECUR_SIMPLE,
    RECUR_CUSTOM
};

static const int type_map[] = {
    RECUR_NONE,
    RECUR_SIMPLE,
    RECUR_CUSTOM,
    -1
};

static const int freq_map[] = {
    ICAL_DAILY_RECURRENCE,
    ICAL_WEEKLY_RECURRENCE,
    ICAL_MONTHLY_RECURRENCE,
    ICAL_YEARLY_RECURRENCE,
    -1
};

enum ending_type {
    ENDING_FOR,
    ENDING_UNTIL,
    ENDING_FOREVER
};

static const int ending_types_map[] = {
    ENDING_FOR,
    ENDING_UNTIL,
    ENDING_FOREVER,
    -1
};

/* Private part of the RecurrencePage structure */
struct _RecurrencePagePrivate {
    /* Component we use to expand the recurrence rules for the preview */
    CalComponent *comp;

    /* Glade XML data */
    GladeXML *xml;

    /* Widgets from the Glade file */

    GtkWidget *main;

    GtkWidget *summary;
    GtkWidget *date_time;
           
    GtkWidget *none;
    GtkWidget *simple;
    GtkWidget *custom;
           
    GtkWidget *params;
    GtkWidget *interval_value;
    GtkWidget *interval_unit;
    GtkWidget *special;
    GtkWidget *ending_menu;
    GtkWidget *ending_special;
    GtkWidget *custom_warning_bin;

    /* For weekly recurrences, created by hand */
    GtkWidget *weekday_picker;
    guint8 weekday_day_mask;
    guint8 weekday_blocked_day_mask;

    /* For monthly recurrences, created by hand */
    GtkWidget *month_index_spin;
    int month_index;

    GtkWidget *month_day_menu;
    enum month_day_options month_day;

    /* For ending date, created by hand */
    GtkWidget *ending_date_edit;
    struct icaltimetype ending_date_tt;

    /* For ending count of occurrences, created by hand */
    GtkWidget *ending_count_spin;
    int ending_count;

    /* More widgets from the Glade file */

    GtkWidget *exception_date;
    GtkWidget *exception_list;
    GtkWidget *exception_add;
    GtkWidget *exception_modify;
    GtkWidget *exception_delete;

    GtkWidget *preview_bin;

    /* For the recurrence preview, the actual widget */
    GtkWidget *preview_calendar;

    gboolean updating;
};



static void recurrence_page_class_init (RecurrencePageClass *class);
static void recurrence_page_init (RecurrencePage *rpage);
static void recurrence_page_destroy (GtkObject *object);

static GtkWidget *recurrence_page_get_widget (CompEditorPage *page);
static void recurrence_page_focus_main_widget (CompEditorPage *page);
static void recurrence_page_fill_widgets (CompEditorPage *page, CalComponent *comp);
static gboolean recurrence_page_fill_component (CompEditorPage *page, CalComponent *comp);
static void recurrence_page_set_summary (CompEditorPage *page, const char *summary);
static void recurrence_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates);

static void field_changed (RecurrencePage *apage);

static CompEditorPageClass *parent_class = NULL;



/**
 * recurrence_page_get_type:
 * 
 * Registers the #RecurrencePage class if necessary, and returns the type ID
 * associated to it.
 * 
 * Return value: The type ID of the #RecurrencePage class.
 **/
GtkType
recurrence_page_get_type (void)
{
    static GtkType recurrence_page_type;

    if (!recurrence_page_type) {
        static const GtkTypeInfo recurrence_page_info = {
            "RecurrencePage",
            sizeof (RecurrencePage),
            sizeof (RecurrencePageClass),
            (GtkClassInitFunc) recurrence_page_class_init,
            (GtkObjectInitFunc) recurrence_page_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        recurrence_page_type = gtk_type_unique (TYPE_COMP_EDITOR_PAGE,
                            &recurrence_page_info);
    }

    return recurrence_page_type;
}

/* Class initialization function for the recurrence page */
static void
recurrence_page_class_init (RecurrencePageClass *class)
{
    CompEditorPageClass *editor_page_class;
    GtkObjectClass *object_class;

    editor_page_class = (CompEditorPageClass *) class;
    object_class = (GtkObjectClass *) class;

    parent_class = gtk_type_class (TYPE_COMP_EDITOR_PAGE);

    editor_page_class->get_widget = recurrence_page_get_widget;
    editor_page_class->focus_main_widget = recurrence_page_focus_main_widget;
    editor_page_class->fill_widgets = recurrence_page_fill_widgets;
    editor_page_class->fill_component = recurrence_page_fill_component;
    editor_page_class->set_summary = recurrence_page_set_summary;
    editor_page_class->set_dates = recurrence_page_set_dates;

    object_class->destroy = recurrence_page_destroy;
}

/* Object initialization function for the recurrence page */
static void
recurrence_page_init (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;

    priv = g_new0 (RecurrencePagePrivate, 1);
    rpage->priv = priv;

    priv->xml = NULL;

    priv->main = NULL;
    priv->summary = NULL;
    priv->date_time = NULL;
    priv->none = NULL;
    priv->simple = NULL;
    priv->custom = NULL;
    priv->params = NULL;
    priv->interval_value = NULL;
    priv->interval_unit = NULL;
    priv->special = NULL;
    priv->ending_menu = NULL;
    priv->ending_special = NULL;
    priv->custom_warning_bin = NULL;
    priv->weekday_picker = NULL;
    priv->month_index_spin = NULL;
    priv->month_day_menu = NULL;
    priv->ending_date_edit = NULL;
    priv->ending_count_spin = NULL;
    priv->exception_date = NULL;
    priv->exception_list = NULL;
    priv->exception_add = NULL;
    priv->exception_modify = NULL;
    priv->exception_delete = NULL;
    priv->preview_bin = NULL;
    priv->preview_calendar = NULL;

    priv->comp = NULL;
}

/* Frees the CalComponentDateTime stored in the GtkCList */
static void
free_exception_date_time (CalComponentDateTime *dt)
{
    g_free (dt->value);
    g_free ((char*)dt->tzid);
    g_free (dt);
}

/* Destroy handler for the recurrence page */
static void
recurrence_page_destroy (GtkObject *object)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;

    g_return_if_fail (object != NULL);
    g_return_if_fail (IS_RECURRENCE_PAGE (object));

    rpage = RECURRENCE_PAGE (object);
    priv = rpage->priv;

    if (priv->xml) {
        gtk_object_unref (GTK_OBJECT (priv->xml));
        priv->xml = NULL;
    }

    if (priv->comp) {
        gtk_object_unref (GTK_OBJECT (priv->comp));
        priv->comp = NULL;
    }

    g_free (priv);
    rpage->priv = NULL;

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}



/* get_widget handler for the recurrence page */
static GtkWidget *
recurrence_page_get_widget (CompEditorPage *page)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;

    rpage = RECURRENCE_PAGE (page);
    priv = rpage->priv;

    return priv->main;
}

/* focus_main_widget handler for the recurrence page */
static void
recurrence_page_focus_main_widget (CompEditorPage *page)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;

    rpage = RECURRENCE_PAGE (page);
    priv = rpage->priv;

    if (e_dialog_toggle_get (priv->none))
        gtk_widget_grab_focus (priv->none);
    else if (e_dialog_toggle_get (priv->simple))
        gtk_widget_grab_focus (priv->simple);
    else if (e_dialog_toggle_get (priv->custom))
        gtk_widget_grab_focus (priv->custom);
    else
        g_assert_not_reached ();
}

/* Fills the widgets with default values */
static void
clear_widgets (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    GtkAdjustment *adj;
    GtkWidget *menu;

    priv = rpage->priv;

    priv->weekday_day_mask = 0;

    priv->month_index = 1;
    priv->month_day = MONTH_DAY_NTH;

    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->custom), rpage);
    e_dialog_radio_set (priv->none, RECUR_NONE, type_map);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->custom), rpage);

    adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (priv->interval_value));
    gtk_signal_handler_block_by_data (GTK_OBJECT (adj), rpage);
    e_dialog_spin_set (priv->interval_value, 1);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (adj), rpage);

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
    gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
    e_dialog_option_menu_set (priv->interval_unit,
                  ICAL_DAILY_RECURRENCE,
                  freq_map);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);

    priv->ending_date_tt = icaltime_today ();
    priv->ending_count = 1;

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->ending_menu));
    gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
    e_dialog_option_menu_set (priv->ending_menu, 
                  ENDING_FOREVER,
                  ending_types_map);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);

    /* Exceptions list */
    gtk_clist_clear (GTK_CLIST (priv->exception_list));
}

/* Builds a static string out of an exception date */
static char *
get_exception_string (CalComponentDateTime *dt)
{
    static char buf[256];
    struct tm tmp_tm;

    tmp_tm.tm_year = dt->value->year - 1900;
    tmp_tm.tm_mon = dt->value->month - 1;
    tmp_tm.tm_mday = dt->value->day;
    tmp_tm.tm_hour = dt->value->hour;
    tmp_tm.tm_min = dt->value->minute;
    tmp_tm.tm_sec = dt->value->second;
    tmp_tm.tm_isdst = -1;

    tmp_tm.tm_wday = time_day_of_week (dt->value->day,
                       dt->value->month - 1,
                       dt->value->year);

    e_time_format_date_and_time (&tmp_tm, calendar_config_get_24_hour_format(), FALSE, FALSE, buf, sizeof (buf));

    return buf;
}

/* Appends an exception date to the list */
static void
append_exception (RecurrencePage *rpage, CalComponentDateTime *datetime)
{
    RecurrencePagePrivate *priv;
    CalComponentDateTime *dt;
    char *c[1];
    int i;
    GtkCList *clist;
    struct icaltimetype *tt;

    priv = rpage->priv;

    dt = g_new (CalComponentDateTime, 1);
    dt->value = g_new (struct icaltimetype, 1);
    *dt->value = *datetime->value;
    dt->tzid = g_strdup (datetime->tzid);

    clist = GTK_CLIST (priv->exception_list);

    gtk_signal_handler_block_by_data (GTK_OBJECT (clist), rpage);

    c[0] = get_exception_string (dt);
    i = gtk_clist_append (clist, c);

    gtk_clist_set_row_data_full (clist, i, dt, (GtkDestroyNotify) free_exception_date_time);

    gtk_clist_select_row (clist, i, 0);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (clist), rpage);

    tt = dt->value;
    e_date_edit_set_date (E_DATE_EDIT (priv->exception_date), 
                  tt->year, tt->month, tt->day);
    e_date_edit_set_time_of_day (E_DATE_EDIT (priv->exception_date), 
                     tt->hour, tt->minute);

    gtk_widget_set_sensitive (priv->exception_modify, TRUE);
    gtk_widget_set_sensitive (priv->exception_delete, TRUE);
}

/* Fills in the exception widgets with the data from the calendar component */
static void
fill_exception_widgets (RecurrencePage *rpage, CalComponent *comp)
{
    RecurrencePagePrivate *priv;
    GSList *list, *l;
    gboolean added;

    priv = rpage->priv;

    cal_component_get_exdate_list (comp, &list);

    added = FALSE;

    for (l = list; l; l = l->next) {
        CalComponentDateTime *cdt;

        added = TRUE;

        cdt = l->data;
        append_exception (rpage, cdt);
    }

    cal_component_free_exdate_list (list);

    if (added)
        gtk_clist_select_row (GTK_CLIST (priv->exception_list), 0, 0);
}

/* Computes a weekday mask for the start day of a calendar component,
 * for use in a WeekdayPicker widget.
 */
static guint8
get_start_weekday_mask (CalComponent *comp)
{
    CalComponentDateTime dt;
    guint8 retval;

    cal_component_get_dtstart (comp, &dt);

    if (dt.value) {
        short weekday;

        weekday = icaltime_day_of_week (*dt.value);
        retval = 0x1 << (weekday - 1);
    } else
        retval = 0;

    cal_component_free_datetime (&dt);

    return retval;
}

/* Sets some sane defaults for the data sources for the recurrence special
 * widgets, even if they will not be used immediately.
 */
static void
set_special_defaults (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    guint8 mask;

    priv = rpage->priv;

    mask = get_start_weekday_mask (priv->comp);

    priv->weekday_day_mask = mask;
    priv->weekday_blocked_day_mask = mask;
}

/* Sensitizes the recurrence widgets based on the state of the recurrence type
 * radio group.
 */
static void
sensitize_recur_widgets (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    enum recur_type type;
    GtkWidget *label;

    priv = rpage->priv;

    type = e_dialog_radio_get (priv->none, type_map);

    if (GTK_BIN (priv->custom_warning_bin)->child)
        gtk_widget_destroy (GTK_BIN (priv->custom_warning_bin)->child);

    switch (type) {
    case RECUR_NONE:
        gtk_widget_set_sensitive (priv->params, FALSE);
        gtk_widget_show (priv->params);
        gtk_widget_hide (priv->custom_warning_bin);
        break;

    case RECUR_SIMPLE:
        gtk_widget_set_sensitive (priv->params, TRUE);
        gtk_widget_show (priv->params);
        gtk_widget_hide (priv->custom_warning_bin);
        break;

    case RECUR_CUSTOM:
        gtk_widget_set_sensitive (priv->params, FALSE);
        gtk_widget_hide (priv->params);

        label = gtk_label_new (_("This appointment contains "
                     "recurrences that Evolution "
                     "cannot edit."));
        gtk_container_add (GTK_CONTAINER (priv->custom_warning_bin),
                   label);
        gtk_widget_show_all (priv->custom_warning_bin);
        break;

    default:
        g_assert_not_reached ();
    }
}

#if 0
/* Encondes a position/weekday pair into the proper format for
 * icalrecurrencetype.by_day. Not needed at present.
 */
static short
nth_weekday (int pos, icalrecurrencetype_weekday weekday)
{
    g_assert (pos > 0 && pos <= 5);

    return (pos << 3) | (int) weekday;
}
#endif

/* Gets the simple recurrence data from the recurrence widgets and stores it in
 * the calendar component.
 */
static void
simple_recur_to_comp (RecurrencePage *rpage, CalComponent *comp)
{
    RecurrencePagePrivate *priv;
    struct icalrecurrencetype r;
    GSList l;
    enum ending_type ending_type;
    gboolean date_set;

    priv = rpage->priv;

    icalrecurrencetype_clear (&r);

    /* Frequency, interval, week start */

    r.freq = e_dialog_option_menu_get (priv->interval_unit, freq_map);
    r.interval = e_dialog_spin_get_int (priv->interval_value);
    r.week_start = ICAL_SUNDAY_WEEKDAY
        + calendar_config_get_week_start_day ();

    /* Frequency-specific data */

    switch (r.freq) {
    case ICAL_DAILY_RECURRENCE:
        /* Nothing else is required */
        break;

    case ICAL_WEEKLY_RECURRENCE: {
        guint8 day_mask;
        int i;

        g_assert (GTK_BIN (priv->special)->child != NULL);
        g_assert (priv->weekday_picker != NULL);
        g_assert (IS_WEEKDAY_PICKER (priv->weekday_picker));

        day_mask = weekday_picker_get_days (WEEKDAY_PICKER (priv->weekday_picker));

        i = 0;

        if (day_mask & (1 << 0))
            r.by_day[i++] = ICAL_SUNDAY_WEEKDAY;

        if (day_mask & (1 << 1))
            r.by_day[i++] = ICAL_MONDAY_WEEKDAY;

        if (day_mask & (1 << 2))
            r.by_day[i++] = ICAL_TUESDAY_WEEKDAY;

        if (day_mask & (1 << 3))
            r.by_day[i++] = ICAL_WEDNESDAY_WEEKDAY;

        if (day_mask & (1 << 4))
            r.by_day[i++] = ICAL_THURSDAY_WEEKDAY;

        if (day_mask & (1 << 5))
            r.by_day[i++] = ICAL_FRIDAY_WEEKDAY;

        if (day_mask & (1 << 6))
            r.by_day[i++] = ICAL_SATURDAY_WEEKDAY;

        break;
    }

    case ICAL_MONTHLY_RECURRENCE: {
        int day_index;
        enum month_day_options month_day;

        g_assert (GTK_BIN (priv->special)->child != NULL);
        g_assert (priv->month_index_spin != NULL);
        g_assert (GTK_IS_SPIN_BUTTON (priv->month_index_spin));
        g_assert (priv->month_day_menu != NULL);
        g_assert (GTK_IS_OPTION_MENU (priv->month_day_menu));

        day_index = e_dialog_spin_get_int (priv->month_index_spin);
        month_day = e_dialog_option_menu_get (priv->month_day_menu,
                              month_day_options_map);

        switch (month_day) {
        case MONTH_DAY_NTH:
            r.by_month_day[0] = day_index;
            break;

        /* Outlook 2000 uses BYDAY=TU;BYSETPOS=2, and will not
           accept BYDAY=2TU. So we now use the same as Outlook
           by default. */
        case MONTH_DAY_MON:
            r.by_day[0] = ICAL_MONDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_TUE:
            r.by_day[0] = ICAL_TUESDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_WED:
            r.by_day[0] = ICAL_WEDNESDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_THU:
            r.by_day[0] = ICAL_THURSDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_FRI:
            r.by_day[0] = ICAL_FRIDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_SAT:
            r.by_day[0] = ICAL_SATURDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        case MONTH_DAY_SUN:
            r.by_day[0] = ICAL_SUNDAY_WEEKDAY;
            r.by_set_pos[0] = day_index;
            break;

        default:
            g_assert_not_reached ();
        }

        break;
    }

    case ICAL_YEARLY_RECURRENCE:
        /* Nothing else is required */
        break;

    default:
        g_assert_not_reached ();
    }

    /* Ending date */

    ending_type = e_dialog_option_menu_get (priv->ending_menu,
                        ending_types_map);

    switch (ending_type) {
    case ENDING_FOR:
        g_assert (priv->ending_count_spin != NULL);
        g_assert (GTK_IS_SPIN_BUTTON (priv->ending_count_spin));

        r.count = e_dialog_spin_get_int (priv->ending_count_spin);
        break;

    case ENDING_UNTIL:
        g_assert (priv->ending_date_edit != NULL);
        g_assert (E_IS_DATE_EDIT (priv->ending_date_edit));

        /* We only allow a DATE value to be set for the UNTIL property,
           since we don't support sub-day recurrences. */
        date_set = e_date_edit_get_date (E_DATE_EDIT (priv->ending_date_edit),
                         &r.until.year,
                         &r.until.month,
                         &r.until.day);
        g_assert (date_set);

        r.until.is_date = 1;

        break;

    case ENDING_FOREVER:
        /* Nothing to be done */
        break;

    default:
        g_assert_not_reached ();
    }

    /* Set the recurrence */

    l.data = &r;
    l.next = NULL;

    cal_component_set_rrule_list (comp, &l);
}

/* Fills a component with the data from the recurrence page; in the case of a
 * custom recurrence, it leaves it intact.
 */
static void
fill_component (RecurrencePage *rpage, CalComponent *comp)
{
    RecurrencePagePrivate *priv;
    enum recur_type recur_type;
    GtkCList *exception_list;
    GSList *list;
    int i;

    priv = rpage->priv;

    recur_type = e_dialog_radio_get (priv->none, type_map);

    switch (recur_type) {
    case RECUR_NONE:
        cal_component_set_rdate_list (comp, NULL);
        cal_component_set_rrule_list (comp, NULL);
        cal_component_set_exrule_list (comp, NULL);
        break;

    case RECUR_SIMPLE:
        cal_component_set_rdate_list (comp, NULL);
        cal_component_set_exrule_list (comp, NULL);
        simple_recur_to_comp (rpage, comp);
        break;

    case RECUR_CUSTOM:
        /* We just keep whatever the component has currently */
        break;

    default:
        g_assert_not_reached ();
    }

    /* Set exceptions */

    list = NULL;
    exception_list = GTK_CLIST (priv->exception_list);
    for (i = 0; i < exception_list->rows; i++) {
        CalComponentDateTime *cdt, *dt;

        cdt = g_new (CalComponentDateTime, 1);
        cdt->value = g_new (struct icaltimetype, 1);

        dt = gtk_clist_get_row_data (exception_list, i);
        g_assert (dt != NULL);

        *cdt->value = *dt->value;
        cdt->tzid = g_strdup (dt->tzid);

#if 0
        g_print ("Adding exception is_date: %i\n", cdt->value->is_date);
#endif

        list = g_slist_prepend (list, cdt);
    }

    cal_component_set_exdate_list (comp, list);
    cal_component_free_exdate_list (list);
}

/* Re-tags the recurrence preview calendar based on the current information of
 * the widgets in the recurrence page.
 */
static void
preview_recur (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    CalComponent *comp;
    CalComponentDateTime cdt;
    GSList *l;

    priv = rpage->priv;

    /* If our component has not been set yet through ::fill_widgets(), we
     * cannot preview the recurrence.
     */
    if (!priv->comp)
        return;

    /* Create a scratch component with the start/end and
     * recurrence/exception information from the one we are editing.
     */

    comp = cal_component_new ();
    cal_component_set_new_vtype (comp, CAL_COMPONENT_EVENT);

    cal_component_get_dtstart (priv->comp, &cdt);
    cal_component_set_dtstart (comp, &cdt);
    cal_component_free_datetime (&cdt);

    cal_component_get_dtend (priv->comp, &cdt);
    cal_component_set_dtend (comp, &cdt);
    cal_component_free_datetime (&cdt);

    cal_component_get_exdate_list (priv->comp, &l);
    cal_component_set_exdate_list (comp, l);
    cal_component_free_exdate_list (l);

    cal_component_get_exrule_list (priv->comp, &l);
    cal_component_set_exrule_list (comp, l);
    cal_component_free_recur_list (l);

    cal_component_get_rdate_list (priv->comp, &l);
    cal_component_set_rdate_list (comp, l);
    cal_component_free_period_list (l);

    cal_component_get_rrule_list (priv->comp, &l);
    cal_component_set_rrule_list (comp, l);
    cal_component_free_recur_list (l);

    fill_component (rpage, comp);

    tag_calendar_by_comp (E_CALENDAR (priv->preview_calendar), comp,
                  COMP_EDITOR_PAGE (rpage)->client, TRUE, FALSE);
    gtk_object_unref (GTK_OBJECT (comp));
}

/* Callback used when the recurrence weekday picker changes */
static void
weekday_picker_changed_cb (WeekdayPicker *wp, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);
    preview_recur (rpage);
}

/* Creates the special contents for weekly recurrences */
static void
make_weekly_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    GtkWidget *hbox;
    GtkWidget *label;
    WeekdayPicker *wp;

    priv = rpage->priv;

    g_assert (GTK_BIN (priv->special)->child == NULL);
    g_assert (priv->weekday_picker == NULL);

    /* Create the widgets */

    hbox = gtk_hbox_new (FALSE, 2);
    gtk_container_add (GTK_CONTAINER (priv->special), hbox);

    label = gtk_label_new (_("on"));
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

    wp = WEEKDAY_PICKER (weekday_picker_new ());

    priv->weekday_picker = GTK_WIDGET (wp);
    gtk_box_pack_start (GTK_BOX (hbox), GTK_WIDGET (wp), FALSE, FALSE, 0);

    gtk_widget_show_all (hbox);

    /* Set the weekdays */

    weekday_picker_set_week_start_day (wp, calendar_config_get_week_start_day ());
    weekday_picker_set_days (wp, priv->weekday_day_mask);
    weekday_picker_set_blocked_days (wp, priv->weekday_blocked_day_mask);

    gtk_signal_connect (GTK_OBJECT (wp), "changed",
                GTK_SIGNAL_FUNC (weekday_picker_changed_cb),
                rpage);
}

/* Creates the option menu for the monthly recurrence days */
static GtkWidget *
make_recur_month_menu (void)
{
    static const char *options[] = {
        N_("day"),
        N_("Monday"),
        N_("Tuesday"),
        N_("Wednesday"),
        N_("Thursday"),
        N_("Friday"),
        N_("Saturday"),
        N_("Sunday")
    };

    GtkWidget *menu;
    GtkWidget *omenu;
    int i;

    menu = gtk_menu_new ();

    for (i = 0; i < sizeof (options) / sizeof (options[0]); i++) {
        GtkWidget *item;

        item = gtk_menu_item_new_with_label (_(options[i]));
        gtk_menu_append (GTK_MENU (menu), item);
        gtk_widget_show (item);
    }

    omenu = gtk_option_menu_new ();
    gtk_option_menu_set_menu (GTK_OPTION_MENU (omenu), menu);

    return omenu;
}

/* For monthly recurrences, changes the valid range of the recurrence day index
 * spin button; e.g. month days are 1-31 while the valid range for a Sunday is
 * the 1st through 5th of the month.
 */
static void
adjust_day_index_spin (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    GtkAdjustment *adj;
    enum month_day_options month_day;

    priv = rpage->priv;

    g_assert (priv->month_day_menu != NULL);
    g_assert (GTK_IS_OPTION_MENU (priv->month_day_menu));
    g_assert (priv->month_index_spin != NULL);
    g_assert (GTK_IS_SPIN_BUTTON (priv->month_index_spin));

    month_day = e_dialog_option_menu_get (priv->month_day_menu,
                          month_day_options_map);

    adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (priv->month_index_spin));

    switch (month_day) {
    case MONTH_DAY_NTH:
        adj->upper = 31;
        gtk_adjustment_changed (adj);
        break;

    case MONTH_DAY_MON:
    case MONTH_DAY_TUE:
    case MONTH_DAY_WED:
    case MONTH_DAY_THU:
    case MONTH_DAY_FRI:
    case MONTH_DAY_SAT:
    case MONTH_DAY_SUN:
        adj->upper = 5;
        gtk_adjustment_changed (adj);

        if (adj->value > 5) {
            adj->value = 5;
            gtk_adjustment_value_changed (adj);
        }

        break;

    default:
        g_assert_not_reached ();
    }
}

/* Callback used when the monthly day selection menu changes.  We need
 * to change the valid range of the day index spin button; e.g. days
 * are 1-31 while a Sunday is the 1st through 5th.
 */
static void
month_day_menu_selection_done_cb (GtkMenuShell *menu_shell, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    adjust_day_index_spin (rpage);
    field_changed (rpage);
    preview_recur (rpage);
}

/* Callback used when the month index value changes. */
static void
month_index_value_changed_cb (GtkAdjustment *adj, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);
    preview_recur (rpage);
}

/* Creates the special contents for monthly recurrences */
static void
make_monthly_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    GtkWidget *hbox;
    GtkWidget *label;
    GtkAdjustment *adj;
    GtkWidget *menu;

    priv = rpage->priv;

    g_assert (GTK_BIN (priv->special)->child == NULL);
    g_assert (priv->month_index_spin == NULL);
    g_assert (priv->month_day_menu == NULL);

    /* Create the widgets */

    hbox = gtk_hbox_new (FALSE, 2);
    gtk_container_add (GTK_CONTAINER (priv->special), hbox);

    label = gtk_label_new (_("on the"));
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

    adj = GTK_ADJUSTMENT (gtk_adjustment_new (1, 1, 31, 1, 10, 10));
    priv->month_index_spin = gtk_spin_button_new (adj, 1, 0);
    gtk_box_pack_start (GTK_BOX (hbox), priv->month_index_spin,
                FALSE, FALSE, 0);

    label = gtk_label_new (_("th"));
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

    priv->month_day_menu = make_recur_month_menu ();
    gtk_box_pack_start (GTK_BOX (hbox), priv->month_day_menu,
                FALSE, FALSE, 0);

    gtk_widget_show_all (hbox);

    /* Set the options */

    e_dialog_spin_set (priv->month_index_spin, priv->month_index);
    e_dialog_option_menu_set (priv->month_day_menu,
                  priv->month_day,
                  month_day_options_map);
    adjust_day_index_spin (rpage);

    gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
                GTK_SIGNAL_FUNC (month_index_value_changed_cb),
                rpage);

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->month_day_menu));
    gtk_signal_connect (GTK_OBJECT (menu), "selection_done",
                GTK_SIGNAL_FUNC (month_day_menu_selection_done_cb),
                rpage);
}

/* Changes the recurrence-special widget to match the interval units.
 *
 * For daily recurrences: nothing.
 * For weekly recurrences: weekday selector.
 * For monthly recurrences: "on the" <nth> [day, Weekday]
 * For yearly recurrences: nothing.
 */
static void
make_recurrence_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    icalrecurrencetype_frequency frequency;

    priv = rpage->priv;

    if (GTK_BIN (priv->special)->child != NULL) {
        gtk_widget_destroy (GTK_BIN (priv->special)->child);

        priv->weekday_picker = NULL;
        priv->month_index_spin = NULL;
        priv->month_day_menu = NULL;
    }

    frequency = e_dialog_option_menu_get (priv->interval_unit, freq_map);

    switch (frequency) {
    case ICAL_DAILY_RECURRENCE:
        gtk_widget_hide (priv->special);
        break;

    case ICAL_WEEKLY_RECURRENCE:
        make_weekly_special (rpage);
        gtk_widget_show (priv->special);
        break;

    case ICAL_MONTHLY_RECURRENCE:
        make_monthly_special (rpage);
        gtk_widget_show (priv->special);
        break;

    case ICAL_YEARLY_RECURRENCE:
        gtk_widget_hide (priv->special);
        break;

    default:
        g_assert_not_reached ();
    }
}

/* Counts the elements in the by_xxx fields of an icalrecurrencetype */
static int
count_by_xxx (short *field, int max_elements)
{
    int i;

    for (i = 0; i < max_elements; i++)
        if (field[i] == ICAL_RECURRENCE_ARRAY_MAX)
            break;

    return i;
}

/* Callback used when the ending-until date editor changes */
static void
ending_until_changed_cb (EDateEdit *de, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);
    field_changed (rpage);
    preview_recur (rpage);
}

/* Creates the special contents for "ending until" (end date) recurrences */
static void
make_ending_until_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    EDateEdit *de;

    priv = rpage->priv;

    g_assert (GTK_BIN (priv->ending_special)->child == NULL);
    g_assert (priv->ending_date_edit == NULL);

    /* Create the widget */

    priv->ending_date_edit = comp_editor_new_date_edit (TRUE, FALSE,
                                FALSE);
    de = E_DATE_EDIT (priv->ending_date_edit);

    gtk_container_add (GTK_CONTAINER (priv->ending_special),
               GTK_WIDGET (de));
    gtk_widget_show_all (GTK_WIDGET (de));

    /* Set the value */

    e_date_edit_set_date (de, priv->ending_date_tt.year,
                  priv->ending_date_tt.month,
                  priv->ending_date_tt.day);

    gtk_signal_connect (GTK_OBJECT (de), "changed",
                GTK_SIGNAL_FUNC (ending_until_changed_cb), rpage);

    /* Make sure the EDateEdit widget uses our timezones to get the
       current time. */
    e_date_edit_set_get_time_callback (de,
                       (EDateEditGetTimeCallback) comp_editor_get_current_time,
                       rpage, NULL);
}

/* Callback used when the ending-count value changes */
static void
ending_count_value_changed_cb (GtkAdjustment *adj, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);
    field_changed (rpage);
    preview_recur (rpage);
}

/* Creates the special contents for the occurrence count case */
static void
make_ending_count_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    GtkWidget *hbox;
    GtkWidget *label;
    GtkAdjustment *adj;

    priv = rpage->priv;

    g_assert (GTK_BIN (priv->ending_special)->child == NULL);
    g_assert (priv->ending_count_spin == NULL);

    /* Create the widgets */

    hbox = gtk_hbox_new (FALSE, 2);
    gtk_container_add (GTK_CONTAINER (priv->ending_special), hbox);

    adj = GTK_ADJUSTMENT (gtk_adjustment_new (1, 1, 10000, 1, 10, 10));
    priv->ending_count_spin = gtk_spin_button_new (adj, 1, 0);
    gtk_box_pack_start (GTK_BOX (hbox), priv->ending_count_spin,
                FALSE, FALSE, 0);

    label = gtk_label_new (_("occurrences"));
    gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);

    gtk_widget_show_all (hbox);

    /* Set the values */

    e_dialog_spin_set (priv->ending_count_spin, priv->ending_count);

    gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
                GTK_SIGNAL_FUNC (ending_count_value_changed_cb),
                rpage);
}

/* Changes the recurrence-ending-special widget to match the ending date option
 *
 * For: <n> [days, weeks, months, years, occurrences]
 * Until: <date selector>
 * Forever: nothing.
 */
static void
make_ending_special (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    enum ending_type ending_type;

    priv = rpage->priv;

    if (GTK_BIN (priv->ending_special)->child != NULL) {
        gtk_widget_destroy (GTK_BIN (priv->ending_special)->child);

        priv->ending_date_edit = NULL;
        priv->ending_count_spin = NULL;
    }

    ending_type = e_dialog_option_menu_get (priv->ending_menu,
                        ending_types_map);

    switch (ending_type) {
    case ENDING_FOR:
        make_ending_count_special (rpage);
        gtk_widget_show (priv->ending_special);
        break;

    case ENDING_UNTIL:
        make_ending_until_special (rpage);
        gtk_widget_show (priv->ending_special);
        break;

    case ENDING_FOREVER:
        gtk_widget_hide (priv->ending_special);
        break;

    default:
        g_assert_not_reached ();
    }
}

/* Fills the recurrence ending date widgets with the values from the calendar
 * component.
 */
static void
fill_ending_date (RecurrencePage *rpage, struct icalrecurrencetype *r)
{
    RecurrencePagePrivate *priv;
    GtkWidget *menu;

    priv = rpage->priv;

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->ending_menu));
    gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);

    if (r->count == 0) {
        if (r->until.year == 0) {
            /* Forever */

            e_dialog_option_menu_set (priv->ending_menu,
                          ENDING_FOREVER,
                          ending_types_map);
        } else {
            /* Ending date */

            priv->ending_date_tt = r->until;
            e_dialog_option_menu_set (priv->ending_menu,
                          ENDING_UNTIL,
                          ending_types_map);
        }
    } else {
        /* Count of occurrences */

        priv->ending_count = r->count;
        e_dialog_option_menu_set (priv->ending_menu,
                      ENDING_FOR,
                      ending_types_map);
    }

    gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);

    make_ending_special (rpage);
}

/* fill_widgets handler for the recurrence page.  This function is particularly
 * tricky because it has to discriminate between recurrences we support for
 * editing and the ones we don't.  We only support at most one recurrence rule;
 * no rdates or exrules (exdates are handled just fine elsewhere).
 */
static void
recurrence_page_fill_widgets (CompEditorPage *page, CalComponent *comp)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    CalComponentText text;
    CompEditorPageDates dates;  
    GSList *rrule_list;
    int len;
    struct icalrecurrencetype *r;
    int n_by_second, n_by_minute, n_by_hour;
    int n_by_day, n_by_month_day, n_by_year_day;
    int n_by_week_no, n_by_month, n_by_set_pos;
    GtkWidget *menu;
    GtkAdjustment *adj;

    rpage = RECURRENCE_PAGE (page);
    priv = rpage->priv;

    /* Keep a copy of the component so that we can expand the recurrence 
     * set for the preview.
     */

    if (priv->comp)
        gtk_object_unref (GTK_OBJECT (priv->comp));

    priv->comp = cal_component_clone (comp);

    /* Don't send off changes during this time */
    priv->updating = TRUE;

    /* Clean the page */
    clear_widgets (rpage);

    /* Summary */
    cal_component_get_summary (comp, &text);
    recurrence_page_set_summary (page, text.value);

    /* Dates */
    comp_editor_dates (&dates, comp);
    recurrence_page_set_dates (page, &dates);
    comp_editor_free_dates (&dates);

    /* Exceptions */
    fill_exception_widgets (rpage, comp);

    /* Set up defaults for the special widgets */
    set_special_defaults (rpage);

    /* No recurrences? */

    if (!cal_component_has_rdates (comp)
        && !cal_component_has_rrules (comp)
        && !cal_component_has_exrules (comp)) {
        gtk_signal_handler_block_by_data (GTK_OBJECT (priv->none),
                          rpage);
        gtk_signal_handler_block_by_data (GTK_OBJECT (priv->simple),
                          rpage);
        gtk_signal_handler_block_by_data (GTK_OBJECT (priv->custom),
                          rpage);
        e_dialog_radio_set (priv->none, RECUR_NONE, type_map);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->none),
                            rpage);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->simple),
                            rpage);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->custom),
                            rpage);

        gtk_widget_set_sensitive (priv->custom, FALSE);

        sensitize_recur_widgets (rpage);
        preview_recur (rpage);

        priv->updating = FALSE;
        return;
    }

    /* See if it is a custom set we don't support */

    cal_component_get_rrule_list (comp, &rrule_list);
    len = g_slist_length (rrule_list);
    if (len > 1
        || cal_component_has_rdates (comp)
        || cal_component_has_exrules (comp))
        goto custom;

    /* Down to one rule, so test that one */

    g_assert (len == 1);
    r = rrule_list->data;

    /* Any funky frequency? */

    if (r->freq == ICAL_SECONDLY_RECURRENCE
        || r->freq == ICAL_MINUTELY_RECURRENCE
        || r->freq == ICAL_HOURLY_RECURRENCE)
        goto custom;

    /* Any funky shit? */

#define N_HAS_BY(field) (count_by_xxx (field, sizeof (field) / sizeof (field[0])))

    n_by_second = N_HAS_BY (r->by_second);
    n_by_minute = N_HAS_BY (r->by_minute);
    n_by_hour = N_HAS_BY (r->by_hour);
    n_by_day = N_HAS_BY (r->by_day);
    n_by_month_day = N_HAS_BY (r->by_month_day);
    n_by_year_day = N_HAS_BY (r->by_year_day);
    n_by_week_no = N_HAS_BY (r->by_week_no);
    n_by_month = N_HAS_BY (r->by_month);
    n_by_set_pos = N_HAS_BY (r->by_set_pos);

    if (n_by_second != 0
        || n_by_minute != 0
        || n_by_hour != 0)
        goto custom;

    /* Filter the funky shit based on the frequency; if there is nothing
     * weird we can actually set the widgets.
     */

    switch (r->freq) {
    case ICAL_DAILY_RECURRENCE:
        if (n_by_day != 0
            || n_by_month_day != 0
            || n_by_year_day != 0
            || n_by_week_no != 0
            || n_by_month != 0
            || n_by_set_pos != 0)
            goto custom;

        menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
        gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
        e_dialog_option_menu_set (priv->interval_unit,
                      ICAL_DAILY_RECURRENCE,
                      freq_map);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);
        break;

    case ICAL_WEEKLY_RECURRENCE: {
        int i;
        guint8 day_mask;

        if (n_by_month_day != 0
            || n_by_year_day != 0
            || n_by_week_no != 0
            || n_by_month != 0
            || n_by_set_pos != 0)
            goto custom;

        day_mask = 0;

        for (i = 0; i < 8 && r->by_day[i] != ICAL_RECURRENCE_ARRAY_MAX; i++) {
            enum icalrecurrencetype_weekday weekday;
            int pos;

            weekday = icalrecurrencetype_day_day_of_week (r->by_day[i]);
            pos = icalrecurrencetype_day_position (r->by_day[i]);

            if (pos != 0)
                goto custom;

            switch (weekday) {
            case ICAL_SUNDAY_WEEKDAY:
                day_mask |= 1 << 0;
                break;

            case ICAL_MONDAY_WEEKDAY:
                day_mask |= 1 << 1;
                break;

            case ICAL_TUESDAY_WEEKDAY:
                day_mask |= 1 << 2;
                break;

            case ICAL_WEDNESDAY_WEEKDAY:
                day_mask |= 1 << 3;
                break;

            case ICAL_THURSDAY_WEEKDAY:
                day_mask |= 1 << 4;
                break;

            case ICAL_FRIDAY_WEEKDAY:
                day_mask |= 1 << 5;
                break;

            case ICAL_SATURDAY_WEEKDAY:
                day_mask |= 1 << 6;
                break;

            default:
                break;
            }
        }

        priv->weekday_day_mask = day_mask;

        menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
        gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
        e_dialog_option_menu_set (priv->interval_unit,
                      ICAL_WEEKLY_RECURRENCE,
                      freq_map);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);
        break;
    }

    case ICAL_MONTHLY_RECURRENCE:
        if (n_by_year_day != 0
            || n_by_week_no != 0
            || n_by_month != 0
            || n_by_set_pos > 1)
            goto custom;

        if (n_by_month_day == 1) {
            int nth;

            if (n_by_set_pos != 0)
                goto custom;

            nth = r->by_month_day[0];
            if (nth < 1)
                goto custom;

            priv->month_index = nth;
            priv->month_day = MONTH_DAY_NTH;
        } else if (n_by_day == 1) {
            enum icalrecurrencetype_weekday weekday;
            int pos;
            enum month_day_options month_day;

            /* Outlook 2000 uses BYDAY=TU;BYSETPOS=2, and will not
               accept BYDAY=2TU. So we now use the same as Outlook
               by default. */

            weekday = icalrecurrencetype_day_day_of_week (r->by_day[0]);
            pos = icalrecurrencetype_day_position (r->by_day[0]);

            if (pos == 0) {
                if (n_by_set_pos != 1)
                    goto custom;
                pos = r->by_set_pos[0];
            } else if (pos < 0) {
                goto custom;
            }

            switch (weekday) {
            case ICAL_MONDAY_WEEKDAY:
                month_day = MONTH_DAY_MON;
                break;

            case ICAL_TUESDAY_WEEKDAY:
                month_day = MONTH_DAY_TUE;
                break;

            case ICAL_WEDNESDAY_WEEKDAY:
                month_day = MONTH_DAY_WED;
                break;

            case ICAL_THURSDAY_WEEKDAY:
                month_day = MONTH_DAY_THU;
                break;

            case ICAL_FRIDAY_WEEKDAY:
                month_day = MONTH_DAY_FRI;
                break;

            case ICAL_SATURDAY_WEEKDAY:
                month_day = MONTH_DAY_SAT;
                break;

            case ICAL_SUNDAY_WEEKDAY:
                month_day = MONTH_DAY_SUN;
                break;

            default:
                goto custom;
            }

            priv->month_index = pos;
            priv->month_day = month_day;
        } else
            goto custom;

        menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
        gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
        e_dialog_option_menu_set (priv->interval_unit,
                      ICAL_MONTHLY_RECURRENCE,
                      freq_map);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);
        break;

    case ICAL_YEARLY_RECURRENCE:
        if (n_by_day != 0
            || n_by_month_day != 0
            || n_by_year_day != 0
            || n_by_week_no != 0
            || n_by_month != 0
            || n_by_set_pos != 0)
            goto custom;

        menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
        gtk_signal_handler_block_by_data (GTK_OBJECT (menu), rpage);
        e_dialog_option_menu_set (priv->interval_unit,
                      ICAL_YEARLY_RECURRENCE,
                      freq_map);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (menu), rpage);
        break;

    default:
        goto custom;
    }

    /* If we got here it means it is a simple recurrence */

    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->custom), rpage);
    e_dialog_radio_set (priv->simple, RECUR_SIMPLE, type_map);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->custom), rpage);

    gtk_widget_set_sensitive (priv->custom, FALSE);

    sensitize_recur_widgets (rpage);
    make_recurrence_special (rpage);

    adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (priv->interval_value));
    gtk_signal_handler_block_by_data (GTK_OBJECT (adj), rpage);
    e_dialog_spin_set (priv->interval_value, r->interval);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (adj), rpage);

    fill_ending_date (rpage, r);

    goto out;

 custom:

    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_block_by_data (GTK_OBJECT (priv->custom), rpage);
    e_dialog_radio_set (priv->custom, RECUR_CUSTOM, type_map);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->none), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->simple), rpage);
    gtk_signal_handler_unblock_by_data (GTK_OBJECT (priv->custom), rpage);

    gtk_widget_set_sensitive (priv->custom, TRUE);
    sensitize_recur_widgets (rpage);

 out:

    cal_component_free_recur_list (rrule_list);
    preview_recur (rpage);

    priv->updating = FALSE;
}

/* fill_component handler for the recurrence page */
static gboolean
recurrence_page_fill_component (CompEditorPage *page, CalComponent *comp)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (page);
    fill_component (rpage, comp);

    return TRUE;
}

/* set_summary handler for the recurrence page */
static void
recurrence_page_set_summary (CompEditorPage *page, const char *summary)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    gchar *s;
    
    rpage = RECURRENCE_PAGE (page);
    priv = rpage->priv;

    s = e_utf8_to_gtk_string (priv->summary, summary);
    gtk_label_set_text (GTK_LABEL (priv->summary), s);
    g_free (s);
}

/* set_dates handler for the recurrence page */
static void
recurrence_page_set_dates (CompEditorPage *page, CompEditorPageDates *dates)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    CalComponentDateTime dt;
    struct icaltimetype icaltime;
    guint8 mask;

    rpage = RECURRENCE_PAGE (page);
    priv = rpage->priv;

    comp_editor_date_label (dates, priv->date_time);

    /* Copy the dates to our component */

    if (!priv->comp)
        return;

    dt.value = &icaltime;

    if (dates->start) {
        icaltime = *dates->start->value;
        dt.tzid = dates->start->tzid;
        cal_component_set_dtstart (priv->comp, &dt);
    }

    if (dates->end) {
        icaltime = *dates->end->value;
        dt.tzid = dates->end->tzid;
        cal_component_set_dtend (priv->comp, &dt);
    }

    /* Update the weekday picker if necessary */
    mask = get_start_weekday_mask (priv->comp);
    if (mask == priv->weekday_blocked_day_mask)
        return;

    priv->weekday_day_mask = priv->weekday_day_mask | mask;
    priv->weekday_blocked_day_mask = mask;

    if (priv->weekday_picker != NULL) {
        weekday_picker_set_days (WEEKDAY_PICKER (priv->weekday_picker),
                     priv->weekday_day_mask);
        weekday_picker_set_blocked_days (WEEKDAY_PICKER (priv->weekday_picker),
                         priv->weekday_blocked_day_mask);
    }

    /* Make sure the preview gets updated. */
    preview_recur (rpage);
}



/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (RecurrencePage *rpage)
{
    CompEditorPage *page = COMP_EDITOR_PAGE (rpage);
    RecurrencePagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;

    priv = rpage->priv;

#define GW(name) glade_xml_get_widget (priv->xml, name)

    priv->main = GW ("recurrence-page");
    if (!priv->main)
        return FALSE;

    /* Get the GtkAccelGroup from the toplevel window, so we can install
       it when the notebook page is mapped. */
    toplevel = gtk_widget_get_toplevel (priv->main);
    accel_groups = gtk_accel_groups_from_object (GTK_OBJECT (toplevel));
    if (accel_groups) {
        page->accel_group = accel_groups->data;
        gtk_accel_group_ref (page->accel_group);
    }

    gtk_widget_ref (priv->main);
    gtk_widget_unparent (priv->main);

    priv->summary = GW ("summary");
    priv->date_time = GW ("date-time");
          
    priv->none = GW ("none");
    priv->simple = GW ("simple");
    priv->custom = GW ("custom");
    priv->params = GW ("params");
          
    priv->interval_value = GW ("interval-value");
    priv->interval_unit = GW ("interval-unit");
    priv->special = GW ("special");
    priv->ending_menu = GW ("ending-menu");
    priv->ending_special = GW ("ending-special");
    priv->custom_warning_bin = GW ("custom-warning-bin");
          
    priv->exception_date = GW ("exception-date");
    priv->exception_list = GW ("exception-list");
    priv->exception_add = GW ("exception-add");
    priv->exception_modify = GW ("exception-modify");
    priv->exception_delete = GW ("exception-delete");
          
    priv->preview_bin = GW ("preview-bin");

#undef GW
    
    return (priv->summary
        && priv->date_time
        && priv->none
        && priv->simple
        && priv->custom
        && priv->params
        && priv->interval_value
        && priv->interval_unit
        && priv->special
        && priv->ending_menu
        && priv->ending_special
        && priv->custom_warning_bin
        && priv->exception_date
        && priv->exception_list
        && priv->exception_add
        && priv->exception_modify
        && priv->exception_delete
        && priv->preview_bin);
}

/* Callback used when the displayed date range in the recurrence preview
 * calendar changes.
 */
static void
preview_date_range_changed_cb (ECalendarItem *item, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);
    preview_recur (rpage);
}

/* Callback used when one of the recurrence type radio buttons is toggled.  We
 * enable or disable the recurrence parameters.
 */
static void
type_toggled_cb (GtkToggleButton *toggle, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);

    if (toggle->active) {
        sensitize_recur_widgets (rpage);
        preview_recur (rpage);
    }
}

/* Callback used when the recurrence interval value spin button changes. */
static void
interval_value_changed_cb (GtkAdjustment *adj, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);
    preview_recur (rpage);
}

/* Callback used when the recurrence interval option menu changes.  We need to
 * change the contents of the recurrence special widget.
 */
static void
interval_selection_done_cb (GtkMenuShell *menu_shell, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);
    make_recurrence_special (rpage);
    preview_recur (rpage);
}

/* Callback used when the recurrence ending option menu changes.  We need to
 * change the contents of the ending special widget.
 */
static void
ending_selection_done_cb (GtkMenuShell *menu_shell, gpointer data)
{
    RecurrencePage *rpage;

    rpage = RECURRENCE_PAGE (data);

    field_changed (rpage);
    make_ending_special (rpage);
    preview_recur (rpage);
}

/* Callback for the "add exception" button */
static void
exception_add_cb (GtkWidget *widget, gpointer data)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    CalComponentDateTime dt;
    struct icaltimetype icaltime = icaltime_null_time ();
    gboolean date_set;

    rpage = RECURRENCE_PAGE (data);
    priv = rpage->priv;

    field_changed (rpage);

    dt.value = &icaltime;

    /* We use DATE values for exceptions, so we don't need a TZID. */
    dt.tzid = NULL;
    icaltime.is_date = 1;

    date_set = e_date_edit_get_date (E_DATE_EDIT (priv->exception_date),
                     &icaltime.year,
                     &icaltime.month,
                     &icaltime.day);
    g_assert (date_set);

    append_exception (rpage, &dt);
    preview_recur (rpage);
}

/* Callback for the "modify exception" button */
static void
exception_modify_cb (GtkWidget *widget, gpointer data)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    GtkCList *clist;
    CalComponentDateTime *dt;
    struct icaltimetype *tt;
    int sel;

    rpage = RECURRENCE_PAGE (data);
    priv = rpage->priv;

    clist = GTK_CLIST (priv->exception_list);
    if (!clist->selection)
        return;

    field_changed (rpage);

    sel = GPOINTER_TO_INT (clist->selection->data);

    dt = gtk_clist_get_row_data (clist, sel);
    tt = dt->value;
    e_date_edit_get_date (E_DATE_EDIT (priv->exception_date), 
                  &tt->year, &tt->month, &tt->day);
    tt->hour = 0;
    tt->minute = 0;
    tt->second = 0;
    tt->is_date = 1;

    /* We get rid of any old TZID, since we are using a DATE value now. */
    g_free ((char*)dt->tzid);
    dt->tzid = NULL;

    gtk_clist_set_text (clist, sel, 0, get_exception_string (dt));

    preview_recur (rpage);
}

/* Callback for the "delete exception" button */
static void
exception_delete_cb (GtkWidget *widget, gpointer data)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    GtkCList *clist;
    int sel;

    rpage = RECURRENCE_PAGE (data);
    priv = rpage->priv;

    clist = GTK_CLIST (priv->exception_list);
    if (!clist->selection)
        return;

    field_changed (rpage);

    sel = GPOINTER_TO_INT (clist->selection->data);

    gtk_clist_remove (clist, sel);
    if (sel >= clist->rows)
        sel--;

    if (clist->rows > 0)
        gtk_clist_select_row (clist, sel, 0);
    else {
        gtk_widget_set_sensitive (priv->exception_modify, FALSE);
        gtk_widget_set_sensitive (priv->exception_delete, FALSE);
    }

    preview_recur (rpage);
}

/* Callback used when a row is selected in the list of exception
 * dates.  We must update the date/time widgets to reflect the
 * exception's value.
 */
static void
exception_select_row_cb (GtkCList *clist, gint row, gint col,
             GdkEvent *event, gpointer data)
{
    RecurrencePage *rpage;
    RecurrencePagePrivate *priv;
    CalComponentDateTime *dt;
    struct icaltimetype *t;

    rpage = RECURRENCE_PAGE (data);
    priv = rpage->priv;

    /* Sometimes GtkCList emits a 'row-selected' signal for row 0 when
       there are 0 rows in the list (after you delete the last row).
       So we check that the row is valid here. */
    if (row >= clist->rows)
        return;

    dt = gtk_clist_get_row_data (clist, row);
    g_assert (dt != NULL);

    t = dt->value;

    e_date_edit_set_date (E_DATE_EDIT (priv->exception_date), 
                  t->year, t->month, t->day);
    e_date_edit_set_time_of_day (E_DATE_EDIT (priv->exception_date), 
                     t->hour, t->minute);
}

/* This is called when any field is changed; it notifies upstream. */
static void
field_changed (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;

    priv = rpage->priv;
    
    if (!priv->updating)
        comp_editor_page_notify_changed (COMP_EDITOR_PAGE (rpage));
}

/* Hooks the widget signals */
static void
init_widgets (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;
    ECalendar *ecal;
    GtkAdjustment *adj;
    GtkWidget *menu;

    priv = rpage->priv;

    /* Recurrence preview */

    priv->preview_calendar = e_calendar_new ();
    ecal = E_CALENDAR (priv->preview_calendar);
    gtk_signal_connect (GTK_OBJECT (ecal->calitem), "date_range_changed",
                GTK_SIGNAL_FUNC (preview_date_range_changed_cb),
                rpage);
    calendar_config_configure_e_calendar (ecal);
    e_calendar_item_set_max_days_sel (ecal->calitem, 0);
    gtk_container_add (GTK_CONTAINER (priv->preview_bin),
               priv->preview_calendar);
    gtk_widget_show (priv->preview_calendar);

    /* Make sure the EDateEdit widgets and ECalendarItem use our timezones
       to get the current time. */
    e_date_edit_set_show_time (E_DATE_EDIT (priv->exception_date), FALSE);
    e_date_edit_set_get_time_callback (E_DATE_EDIT (priv->exception_date),
                       (EDateEditGetTimeCallback) comp_editor_get_current_time,
                       rpage, NULL);
    e_calendar_item_set_get_time_callback (ecal->calitem,
                           (ECalendarItemGetTimeCallback) comp_editor_get_current_time,
                           rpage, NULL);

    /* Recurrence types */

    gtk_signal_connect (GTK_OBJECT (priv->none), "toggled",
                GTK_SIGNAL_FUNC (type_toggled_cb), rpage);
    gtk_signal_connect (GTK_OBJECT (priv->simple), "toggled",
                GTK_SIGNAL_FUNC (type_toggled_cb), rpage);
    gtk_signal_connect (GTK_OBJECT (priv->custom), "toggled",
                GTK_SIGNAL_FUNC (type_toggled_cb), rpage);

    /* Recurrence interval */

    adj = gtk_spin_button_get_adjustment (GTK_SPIN_BUTTON (priv->interval_value));
    gtk_signal_connect (GTK_OBJECT (adj), "value_changed",
                GTK_SIGNAL_FUNC (interval_value_changed_cb),
                rpage);

    /* Recurrence units */

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->interval_unit));
    gtk_signal_connect (GTK_OBJECT (menu), "selection_done",
                GTK_SIGNAL_FUNC (interval_selection_done_cb),
                rpage);

    /* Recurrence ending */

    menu = gtk_option_menu_get_menu (GTK_OPTION_MENU (priv->ending_menu));
    gtk_signal_connect (GTK_OBJECT (menu), "selection_done",
                GTK_SIGNAL_FUNC (ending_selection_done_cb), rpage);

    /* Exception buttons */

    gtk_signal_connect (GTK_OBJECT (priv->exception_add), "clicked",
                GTK_SIGNAL_FUNC (exception_add_cb), rpage);
    gtk_signal_connect (GTK_OBJECT (priv->exception_modify), "clicked",
                GTK_SIGNAL_FUNC (exception_modify_cb), rpage);
    gtk_signal_connect (GTK_OBJECT (priv->exception_delete), "clicked",
                GTK_SIGNAL_FUNC (exception_delete_cb), rpage);

    /* Selections in the exceptions list */

    gtk_signal_connect (GTK_OBJECT (priv->exception_list), "select_row",
                GTK_SIGNAL_FUNC (exception_select_row_cb), rpage);
}



/**
 * recurrence_page_construct:
 * @rpage: A recurrence page.
 *
 * Constructs a recurrence page by loading its Glade data.
 *
 * Return value: The same object as @rpage, or NULL if the widgets could not be
 * created.
 **/
RecurrencePage *
recurrence_page_construct (RecurrencePage *rpage)
{
    RecurrencePagePrivate *priv;

    priv = rpage->priv;

    priv->xml = glade_xml_new (EVOLUTION_GLADEDIR 
                   "/recurrence-page.glade", NULL);
    if (!priv->xml) {
        g_message ("recurrence_page_construct(): "
               "Could not load the Glade XML file!");
        return NULL;
    }

    if (!get_widgets (rpage)) {
        g_message ("recurrence_page_construct(): "
               "Could not find all widgets in the XML file!");
        return NULL;
    }

    init_widgets (rpage);

    return rpage;
}

/**
 * recurrence_page_new:
 *
 * Creates a new recurrence page.
 *
 * Return value: A newly-created recurrence page, or NULL if the page could not
 * be created.
 **/
RecurrencePage *
recurrence_page_new (void)
{
    RecurrencePage *rpage;

    rpage = gtk_type_new (TYPE_RECURRENCE_PAGE);
    if (!recurrence_page_construct (rpage)) {
        gtk_object_unref (GTK_OBJECT (rpage));
        return NULL;
    }

    return rpage;
}


GtkWidget *make_exdate_date_edit (void);

GtkWidget *
make_exdate_date_edit (void)
{
    return comp_editor_new_date_edit (TRUE, TRUE, FALSE);
}