path: root/calendar/gui/e-itip-control.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-itip-control.c
 *
 * Copyright (C) 2001  Ximian, Inc.
 *
 * 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.
 *
 * Author: JP Rosevear
 */

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

#include <glib.h>
#include <gtk/gtkmisc.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <libgnome/gnome-util.h>
#include <libgnomeui/gnome-stock.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <ical.h>
#include <cal-util/cal-component.h>
#include <cal-client/cal-client.h>
#include <e-util/e-time-utils.h>
#include <e-util/e-dialog-widgets.h>
#include "calendar-config.h"
#include "itip-utils.h"
#include "e-itip-control.h"

struct _EItipControlPrivate {
    GtkWidget *summary;
    GtkWidget *datetime;
    GtkWidget *message;
    GtkWidget *count;
    GtkWidget *options;
    GtkWidget *ok;
    GtkWidget *next;
    GtkWidget *prev;

    CalClient *event_client;
    CalClient *task_client;

    char *vcalendar;
    CalComponent *comp;
    icalcomponent *main_comp;
    icalcomponent *ical_comp;
    icalcompiter iter;
    icalproperty_method method;

    const int *map;
    int current;
    int total;

    GList *addresses;
    gchar *from_address;
    gchar *my_address;
};

/* Option menu maps */
enum { 
    UPDATE_CALENDAR
};

enum { 
    ACCEPT_TO_CALENDAR_RSVP,
    ACCEPT_TO_CALENDAR,
    TENTATIVE_TO_CALENDAR_RSVP,
    TENTATIVE_TO_CALENDAR,
    DECLINE_TO_CALENDAR_RSVP,
    DECLINE_TO_CALENDAR
};

enum { 
    SEND_FREEBUSY
};

enum { 
    CANCEL_CALENDAR
};

static const int publish_map[] = {
    UPDATE_CALENDAR,
    -1
};

static const char *publish_text_map[] = {
    "Update Calendar",
    NULL
};

static const int request_map[] = {
    ACCEPT_TO_CALENDAR_RSVP,
    ACCEPT_TO_CALENDAR,
    TENTATIVE_TO_CALENDAR_RSVP,
    TENTATIVE_TO_CALENDAR,
    DECLINE_TO_CALENDAR_RSVP,
    DECLINE_TO_CALENDAR,
    -1
};

static const char *request_text_map[] = {
    "Accept and RSVP",
    "Accept and do not RSVP",
    "Tentatively accept and RSVP",
    "Tentatively accept and do not RSVP",
    "Decline and RSVP",
    "Decline and do not RSVP",
    NULL
};

static const int request_fb_map[] = {
    SEND_FREEBUSY,
    -1
};

static const char *request_fb_text_map[] = {
    "Send Free/Busy Information",
    NULL
};

static const int reply_map[] = {
    UPDATE_CALENDAR,
    -1
};

static const char *reply_text_map[] = {
    "Update Calendar",
    NULL
};

static const int cancel_map[] = {
    CANCEL_CALENDAR,
    -1
};

static const char *cancel_text_map[] = {
    "Cancel",
    NULL
};

static void class_init  (EItipControlClass   *klass);
static void init    (EItipControl        *itip);
static void destroy (GtkObject               *obj);

static void prev_clicked_cb (GtkWidget *widget, gpointer data);
static void next_clicked_cb (GtkWidget *widget, gpointer data);
static void ok_clicked_cb (GtkWidget *widget, gpointer data);

static GtkVBoxClass *parent_class = NULL;


GtkType
e_itip_control_get_type (void)
{
    static GtkType type = 0;

    if (type == 0) {
        static const GtkTypeInfo info =
        {
            "EItipControl",
            sizeof (EItipControl),
            sizeof (EItipControlClass),
            (GtkClassInitFunc) class_init,
            (GtkObjectInitFunc) init,
            /* reserved_1 */ NULL,
            /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };

        type = gtk_type_unique (gtk_vbox_get_type (), &info);
    }

    return type;
}

static void
class_init (EItipControlClass *klass)
{
    GtkObjectClass *object_class;

    object_class = GTK_OBJECT_CLASS (klass);

    parent_class = gtk_type_class (gtk_vbox_get_type ());

    object_class->destroy = destroy;
}


/* Calendar Server routines */
static void
start_calendar_server_cb (CalClient *cal_client,
              CalClientOpenStatus status,
              gpointer data)
{
    gboolean *success = data;

    if (status == CAL_CLIENT_OPEN_SUCCESS)
        *success = TRUE;
    else
        *success = FALSE;

    gtk_main_quit (); /* end the sub event loop */
}

static CalClient *
start_calendar_server (gchar *uri)
{
    CalClient *client;
    gchar *filename;
    gboolean success;
    
    client = cal_client_new ();

    /* FIX ME */
    filename = g_concat_dir_and_file (g_get_home_dir (), uri);

    gtk_signal_connect (GTK_OBJECT (client), "cal_opened",
                start_calendar_server_cb, &success);

    if (!cal_client_open_calendar (client, filename, FALSE))
        return NULL;

    /* run a sub event loop to turn cal-client's async load
       notification into a synchronous call */
    gtk_main ();

    if (success)
        return client;

    return NULL;
}

static void
init (EItipControl *itip)
{
    EItipControlPrivate *priv;
    GtkWidget *hbox, *table, *lbl;
    
    priv = g_new0 (EItipControlPrivate, 1);

    itip->priv = priv;

    /* Addresses */
    priv->addresses = itip_addresses_get ();
    
    /* Header */
    priv->count = gtk_label_new ("0 of 0");
    gtk_widget_show (priv->count);
    priv->prev = gnome_stock_button (GNOME_STOCK_BUTTON_PREV);
    gtk_widget_show (priv->prev);
    priv->next = gnome_stock_button (GNOME_STOCK_BUTTON_NEXT);
    gtk_widget_show (priv->next);

    hbox = gtk_hbox_new (FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), priv->prev, FALSE, FALSE, 4);
    gtk_box_pack_start (GTK_BOX (hbox), priv->count, TRUE, TRUE, 4);
    gtk_box_pack_start (GTK_BOX (hbox), priv->next, FALSE, FALSE, 4);
    gtk_widget_show (hbox);

    gtk_box_pack_start (GTK_BOX (itip), hbox, FALSE, FALSE, 4);

    gtk_signal_connect (GTK_OBJECT (priv->prev), "clicked",
                GTK_SIGNAL_FUNC (prev_clicked_cb), itip);
    gtk_signal_connect (GTK_OBJECT (priv->next), "clicked",
                GTK_SIGNAL_FUNC (next_clicked_cb), itip);

    /* Information */
    table = gtk_table_new (1, 3, FALSE);
    gtk_widget_show (table);

    lbl = gtk_label_new (_("Summary:"));
    gtk_misc_set_alignment (GTK_MISC (lbl), 0.0, 0.0);
    gtk_widget_show (lbl);
    gtk_table_attach (GTK_TABLE (table), lbl, 0, 1, 0, 1,
              GTK_EXPAND & GTK_FILL, GTK_SHRINK, 4, 0);
    priv->summary = gtk_label_new ("");
    gtk_misc_set_alignment (GTK_MISC (priv->summary), 0.0, 0.5);
    gtk_widget_show (priv->summary);
    gtk_table_attach (GTK_TABLE (table), priv->summary, 1, 2, 0, 1,
              GTK_EXPAND & GTK_FILL, GTK_EXPAND, 4, 0);

    lbl = gtk_label_new (_("Date/Time:"));
    gtk_misc_set_alignment (GTK_MISC (lbl), 0.0, 0.5);
    gtk_widget_show (lbl);
    gtk_table_attach (GTK_TABLE (table), lbl, 0, 1, 1, 2, 
              GTK_EXPAND, GTK_SHRINK, 4, 0);
    priv->datetime = gtk_label_new ("");
    gtk_misc_set_alignment (GTK_MISC (priv->datetime), 0.0, 0.5);
    gtk_widget_show (priv->datetime);
    gtk_table_attach (GTK_TABLE (table), priv->datetime, 1, 2, 1, 2,
              GTK_EXPAND & GTK_FILL, GTK_EXPAND, 4, 0);

    priv->message = gtk_label_new ("");
    gtk_label_set_line_wrap (GTK_LABEL (priv->message), TRUE);
    gtk_widget_show (priv->message);
    gtk_table_attach (GTK_TABLE (table), priv->message, 0, 2, 2, 3, 
              GTK_EXPAND & GTK_FILL, GTK_EXPAND & GTK_FILL, 4, 0);

    gtk_box_pack_start (GTK_BOX (itip), table, FALSE, FALSE, 4);

    /* Actions */
    priv->options = gtk_option_menu_new ();
    gtk_widget_show (priv->options);
    priv->ok = gnome_stock_button (GNOME_STOCK_BUTTON_OK);
    gtk_widget_show (priv->ok);

    hbox = hbox = gtk_hbox_new (FALSE, 0);
    gtk_box_pack_start (GTK_BOX (hbox), priv->options, TRUE, TRUE, 4);
    gtk_box_pack_start (GTK_BOX (hbox), priv->ok, FALSE, FALSE, 4);
    gtk_widget_show (hbox);

    gtk_signal_connect (GTK_OBJECT (priv->ok), "clicked",
                GTK_SIGNAL_FUNC (ok_clicked_cb), itip);

    gtk_box_pack_start (GTK_BOX (itip), hbox, FALSE, FALSE, 4);

    /* Get the cal clients */
    priv->event_client = start_calendar_server ("evolution/local/Calendar/calendar.ics");
    if (priv->event_client == NULL)
        g_warning ("Unable to start calendar client");
    priv->task_client = start_calendar_server ("evolution/local/Tasks/tasks.ics");
        g_warning ("Unable to start calendar client");
}

static void
destroy (GtkObject *obj)
{
    EItipControl *itip = E_ITIP_CONTROL (obj);
    EItipControlPrivate *priv;

    priv = itip->priv;

    itip_addresses_free (priv->addresses);
    
    g_free (priv);
}

GtkWidget *
e_itip_control_new (void)
{
    return gtk_type_new (E_TYPE_ITIP_CONTROL);
}

static void
find_my_address (EItipControl *itip, icalcomponent *ical_comp)
{
    EItipControlPrivate *priv;
    icalproperty *prop;
    const char *attendee, *text;
    icalvalue *value;
    
    priv = itip->priv;

    for (prop = icalcomponent_get_first_property (ical_comp, ICAL_ATTENDEE_PROPERTY);
         prop != NULL;
         prop = icalcomponent_get_next_property (ical_comp, ICAL_ATTENDEE_PROPERTY))
    {
        GList *l;
        
        value = icalproperty_get_value (prop);
        if (!value)
            continue;

        attendee = icalvalue_get_string (value);
        
        attendee = icalvalue_get_string (value);

        text = itip_strip_mailto (attendee);
        for (l = priv->addresses; l != NULL; l = l->next) {
            ItipAddress *a = l->data;
            
            if (strcmp (a->address, text)) {
                priv->my_address = a->address;
                return;
            }
        }
    }
}

static icalproperty *
find_attendee (icalcomponent *ical_comp, char *address)
{
    icalproperty *prop;
    const char *attendee, *text;
    icalvalue *value;
    
    g_return_val_if_fail (address != NULL, NULL);

    for (prop = icalcomponent_get_first_property (ical_comp, ICAL_ATTENDEE_PROPERTY);
         prop != NULL;
         prop = icalcomponent_get_next_property (ical_comp, ICAL_ATTENDEE_PROPERTY))
    {
        value = icalproperty_get_value (prop);
        if (!value)
            continue;

        attendee = icalvalue_get_string (value);

        text = itip_strip_mailto (attendee);
        if (!strstr (text, address))
            break;
    }
            
    return prop;
}

static void
set_label (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    gchar *text;
    
    priv = itip->priv;
    
    text = g_strdup_printf ("%d of %d", priv->current, priv->total);
    gtk_label_set_text (GTK_LABEL (priv->count), text);

}

static void
set_button_status (EItipControl *itip) 
{
    EItipControlPrivate *priv;

    priv = itip->priv;

    if (priv->current == priv->total)
        gtk_widget_set_sensitive (priv->next, FALSE);
    else
        gtk_widget_set_sensitive (priv->next, TRUE);

    if (priv->current == 1)
        gtk_widget_set_sensitive (priv->prev, FALSE);
    else
        gtk_widget_set_sensitive (priv->prev, TRUE);
}

static GtkWidget *
create_menu (const char **map) 
{
    GtkWidget *menu, *item;
    int i;
    
    menu = gtk_menu_new ();

    for (i = 0; map[i] != NULL; i++) {
        item = gtk_menu_item_new_with_label (map[i]);
        gtk_widget_show (item);
        gtk_menu_append (GTK_MENU (menu), item);
    }
    gtk_widget_show (menu);
    
    return menu;
}

static void
set_options (EItipControl *itip)
{
    EItipControlPrivate *priv;
    gboolean sens = TRUE;
    
    priv = itip->priv;
    
    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        priv->map = publish_map;
        gtk_option_menu_set_menu (GTK_OPTION_MENU (priv->options), 
                      create_menu (publish_text_map));
        break;
    case ICAL_METHOD_REQUEST:
        priv->map = request_map;
        gtk_option_menu_set_menu (GTK_OPTION_MENU (priv->options),
                      create_menu (request_text_map));
        break;
    case ICAL_METHOD_REPLY:
        priv->map = reply_map;
        gtk_option_menu_set_menu (GTK_OPTION_MENU (priv->options),
                      create_menu (reply_text_map));
        break;
    case ICAL_METHOD_CANCEL:
        priv->map = cancel_map;
        gtk_option_menu_set_menu (GTK_OPTION_MENU (priv->options),
                      create_menu (cancel_text_map));
        break;
    default:
        priv->map = NULL;
        gtk_option_menu_remove_menu (GTK_OPTION_MENU (priv->options));
        sens = FALSE;
    }

    gtk_widget_set_sensitive (priv->options, sens);
    gtk_widget_set_sensitive (priv->ok, sens);
}


static void
set_options_freebusy (EItipControl *itip)
{
    EItipControlPrivate *priv;
    gboolean sens = TRUE;
    
    priv = itip->priv;
    
    switch (priv->method) {
    case ICAL_METHOD_REQUEST:
        priv->map = request_fb_map;
        gtk_option_menu_set_menu (GTK_OPTION_MENU (priv->options),
                      create_menu (request_fb_text_map));
        break;
    default:
        priv->map = NULL;
        gtk_option_menu_remove_menu (GTK_OPTION_MENU (priv->options));
        sens = FALSE;
    }

    gtk_widget_set_sensitive (priv->options, sens);
    gtk_widget_set_sensitive (priv->ok, sens);
}

static void
write_label_piece (time_t t, char *buffer, int size, char *stext, char *etext)
{
    struct tm *tmp_tm;
    int len;
    
    /* FIXME: Convert to an appropriate timezone. */
    tmp_tm = localtime (&t);
    if (stext != NULL)
        strcat (buffer, stext);

    len = strlen (buffer);
    e_time_format_date_and_time (tmp_tm,
                     calendar_config_get_24_hour_format (), 
                     FALSE, FALSE,
                     &buffer[len], size - len);
    if (etext != NULL)
        strcat (buffer, etext);
}

static void
set_date_label (GtkWidget *lbl, CalComponent *comp)
{
    CalComponentDateTime datetime;
    time_t start = 0, end = 0, complete = 0, due = 0;
    static char buffer[1024];

    /* FIXME: timezones. */
    cal_component_get_dtstart (comp, &datetime);
    if (datetime.value)
        start = icaltime_as_timet (*datetime.value);
    cal_component_get_dtend (comp, &datetime);
    if (datetime.value)
        end = icaltime_as_timet (*datetime.value);
    cal_component_get_due (comp, &datetime);
    if (datetime.value)
        due = icaltime_as_timet (*datetime.value);
    cal_component_get_completed (comp, &datetime.value);
    if (datetime.value)
        complete = icaltime_as_timet (*datetime.value);

    buffer[0] = '\0';

    if (start > 0)
        write_label_piece (start, buffer, 1024, NULL, NULL);

    if (end > 0 && start > 0)
        write_label_piece (end, buffer, 1024, _(" to "), NULL);

    if (complete > 0) {
        if (start > 0)
            write_label_piece (complete, buffer, 1024, _(" (Completed "), ")");
        else
            write_label_piece (complete, buffer, 1024, _("Completed "), NULL);
    }
    
    if (due > 0 && complete == 0) {
        if (start > 0)
            write_label_piece (due, buffer, 1024, _(" (Due "), ")");
        else
            write_label_piece (due, buffer, 1024, _("Due "), NULL);
    }

    gtk_label_set_text (GTK_LABEL (lbl), buffer);
}

static void
set_message (EItipControl *itip, gchar *message, gboolean err) 
{
    EItipControlPrivate *priv;
    GtkStyle *style = NULL;
    
    priv = itip->priv;

    if (err) {
        GdkColor color = {0, 65535, 0, 0};
        
        style = gtk_style_copy (gtk_widget_get_style (priv->message));
        style->fg[0] = color;
        gtk_widget_set_style (priv->message, style);
    } else {
        gtk_widget_restore_default_style (priv->message);
    }

    if (message != NULL)
        gtk_label_set_text (GTK_LABEL (priv->message), message);        
    else
        gtk_label_set_text (GTK_LABEL (priv->message), "");

    if (err) {
        gtk_style_unref (style);
    }
}

static void
show_current_event (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalComponentText text;
    
    priv = itip->priv;

    set_options (itip);
    
    cal_component_get_summary (priv->comp, &text);
    if (text.value)
        gtk_label_set_text (GTK_LABEL (priv->summary), text.value);
    else
        gtk_label_set_text (GTK_LABEL (priv->summary), "");

    set_date_label (priv->datetime, priv->comp);

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        set_message (itip, _("This is an event that can be added to your calendar."), FALSE);
        break;
    case ICAL_METHOD_REQUEST:
        set_message (itip, _("This is a meeting request."), FALSE);
        break;
    case ICAL_METHOD_ADD:
        set_message (itip, _("This is one or more additions to a current meeting."), FALSE);
        break;
    case ICAL_METHOD_REFRESH:
        set_message (itip, _("This is a request for the latest event information."), FALSE);
        break;
    case ICAL_METHOD_REPLY:
        set_message (itip, _("This is a reply to a meeting request."), FALSE);
        break;
    case ICAL_METHOD_CANCEL:
        set_message (itip, _("This is an event cancellation."), FALSE);
        break;
    default:
        set_message (itip, _("The message is not understandable."), TRUE);
    }

}

static void
show_current_todo (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalComponentText text;
    
    priv = itip->priv;

    set_options (itip);
    
    cal_component_get_summary (priv->comp, &text);
    if (text.value)
        gtk_label_set_text (GTK_LABEL (priv->summary), text.value);
    else
        gtk_label_set_text (GTK_LABEL (priv->summary), "");

    set_date_label (priv->datetime, priv->comp);

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        set_message (itip, _("This is an task that can be added to your calendar."), FALSE);
        break;
    case ICAL_METHOD_REQUEST:
        set_message (itip, _("This is a task request."), FALSE);
        break;
    case ICAL_METHOD_REFRESH:
        set_message (itip, _("This is a request for the latest task information."), FALSE);
        break;
    case ICAL_METHOD_REPLY:
        set_message (itip, _("This is a reply to a task request."), FALSE);
        break;
    case ICAL_METHOD_CANCEL:
        set_message (itip, _("This is an task cancellation."), FALSE);
        break;
    default:
        set_message (itip, _("The message is not understandable."), TRUE);
    }
}

static void
show_current_freebusy (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    
    priv = itip->priv;

    set_options_freebusy (itip);
    
    gtk_label_set_text (GTK_LABEL (priv->summary), "");

    set_date_label (priv->datetime, priv->comp);

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        set_message (itip, _("This is freebusy information."), FALSE);
        break;
    case ICAL_METHOD_REQUEST:
        set_message (itip, _("This is a request for freebusy information."), FALSE);
        break;
    case ICAL_METHOD_REPLY:
        set_message (itip, _("This is a reply to a freebusy request."), FALSE);
        break;
    default:
        set_message (itip, _("The message is not understandable."), TRUE);
    }
}

static icalcomponent *
get_next (icalcompiter *iter) 
{
    icalcomponent *ret = NULL;
    icalcomponent_kind kind = ICAL_NO_COMPONENT;
    
    while (kind != ICAL_VEVENT_COMPONENT 
           && kind != ICAL_VTODO_COMPONENT
           && kind != ICAL_VFREEBUSY_COMPONENT) {
        icalcompiter_next (iter);   
        ret = icalcompiter_deref (iter);
        kind = icalcomponent_isa (ret);
    }

    return ret;
}

static icalcomponent *
get_prev (icalcompiter *iter)
{
    icalcomponent *ret = NULL;
    icalcomponent_kind kind = ICAL_NO_COMPONENT;
    
    while (kind != ICAL_VEVENT_COMPONENT 
           && kind != ICAL_VTODO_COMPONENT
           && kind != ICAL_VFREEBUSY_COMPONENT) {
        icalcompiter_prior (iter);  
        ret = icalcompiter_deref (iter);
        kind = icalcomponent_isa (ret);
    }

    return ret;
}

static void
show_current (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalComponentVType type;

    priv = itip->priv;

    set_label (itip);
    set_button_status (itip);

    if (priv->comp)
        gtk_object_unref (GTK_OBJECT (priv->comp));
    
    priv->comp = cal_component_new ();
    if (!cal_component_set_icalcomponent (priv->comp, priv->ical_comp)) {
        set_message (itip, _("The message does not appear to be properly formed"), TRUE);
        gtk_object_unref (GTK_OBJECT (priv->comp));
        priv->comp = NULL;
        return;
    };

    type = cal_component_get_vtype (priv->comp);

    switch (type) {
    case CAL_COMPONENT_EVENT:
        show_current_event (itip);
        break;
    case CAL_COMPONENT_TODO:
        show_current_todo (itip);
        break;
    case CAL_COMPONENT_FREEBUSY:
        show_current_freebusy (itip);
        break;
    default:
        set_message (itip, _("The message contains only unsupported requests."), TRUE);
    }

    find_my_address (itip, priv->ical_comp);
}

void
e_itip_control_set_data (EItipControl *itip, const gchar *text) 
{
    EItipControlPrivate *priv;
    icalproperty *prop;
    icalcomponent_kind kind = ICAL_NO_COMPONENT;

    priv = itip->priv;
    
    priv->vcalendar = g_strdup (text);
    
    priv->main_comp = icalparser_parse_string (priv->vcalendar);
    if (priv->main_comp == NULL) {
        set_message (itip, _("The information contained in this attachment was not valid"), TRUE);
        priv->comp = NULL;
        priv->total = 0;
        priv->current = 0;
        goto show;
        
    }

    prop = icalcomponent_get_first_property (priv->main_comp, ICAL_METHOD_PROPERTY);
    priv->method = icalproperty_get_method (prop);

    priv->iter = icalcomponent_begin_component (priv->main_comp, ICAL_ANY_COMPONENT);
    priv->ical_comp = icalcompiter_deref (&priv->iter);
    kind = icalcomponent_isa (priv->ical_comp);
    if (kind != ICAL_VEVENT_COMPONENT 
        && kind != ICAL_VTODO_COMPONENT
        && kind != ICAL_VFREEBUSY_COMPONENT)
        priv->ical_comp = get_next (&priv->iter);
    
    priv->total = icalcomponent_count_components (priv->main_comp, ICAL_VEVENT_COMPONENT);
    priv->total += icalcomponent_count_components (priv->main_comp, ICAL_VTODO_COMPONENT);
    priv->total += icalcomponent_count_components (priv->main_comp, ICAL_VFREEBUSY_COMPONENT);
    
    if (priv->total > 0)
        priv->current = 1;
    else
        priv->current = 0;

 show:  
    show_current (itip);
}

gchar *
e_itip_control_get_data (EItipControl *itip) 
{
    EItipControlPrivate *priv;

    priv = itip->priv;
    
    return g_strdup (priv->vcalendar);
}

gint
e_itip_control_get_data_size (EItipControl *itip) 
{
    EItipControlPrivate *priv;

    priv = itip->priv;
    
    if (priv->vcalendar == NULL)
        return 0;
    
    return strlen (priv->vcalendar);
}

void
e_itip_control_set_from_address (EItipControl *itip, const gchar *address)
{
    EItipControlPrivate *priv;

    priv = itip->priv;

    if (priv->from_address)
        g_free (priv->from_address);
    
    priv->from_address = g_strdup (address);
}

const gchar *
e_itip_control_get_from_address (EItipControl *itip)
{
    EItipControlPrivate *priv;

    priv = itip->priv;

    return priv->from_address;
}

static void
update_item (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalClient *client;
    CalComponentVType type;
    
    priv = itip->priv;

    type = cal_component_get_vtype (priv->comp);
    if (type == CAL_COMPONENT_TODO)
        client = priv->task_client;
    else 
        client = priv->event_client;
    
    if (!cal_client_update_object (client, priv->comp)) {
        GtkWidget *dialog;
        
        dialog = gnome_warning_dialog(_("I couldn't update your calendar file!\n"));
        gnome_dialog_run (GNOME_DIALOG(dialog));
    }
}

static void
remove_item (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalClient *client;
    CalComponentVType type;
    const char *uid;
    
    priv = itip->priv;

    type = cal_component_get_vtype (priv->comp);
    if (type == CAL_COMPONENT_TODO)
        client = priv->task_client;
    else 
        client = priv->event_client;

    cal_component_get_uid (priv->comp, &uid);
    if (!cal_client_remove_object (client, uid)) {
        GtkWidget *dialog;
        
        dialog = gnome_warning_dialog(_("I couldn't remove the item from your calendar file!\n"));
        gnome_dialog_run (GNOME_DIALOG(dialog));
    }
}

static void
send_freebusy (EItipControl *itip)
{
    EItipControlPrivate *priv;
    CalComponent *comp;
    CalComponentDateTime datetime;
    CalClientGetStatus status;
    time_t start, end;

    priv = itip->priv;
    
    /* FIXME: timezones. */
    cal_component_get_dtstart (priv->comp, &datetime);
    start = icaltime_as_timet (*datetime.value);
    cal_component_get_dtend (priv->comp, &datetime);
    end = icaltime_as_timet (*datetime.value);
    status = cal_client_get_free_busy (priv->event_client, start, end, &comp);
    if (status == CAL_CLIENT_GET_SUCCESS)
        itip_send_comp (CAL_COMPONENT_METHOD_REPLY, comp);
}

static void
change_status (EItipControl *itip, gchar *address, icalparameter_partstat status)
{
    EItipControlPrivate *priv;
    icalproperty *prop;

    priv = itip->priv;

    prop = find_attendee (priv->ical_comp, address);
    if (prop) {
        icalparameter *param;

        icalproperty_remove_parameter (prop, ICAL_PARTSTAT_PARAMETER);
        param = icalparameter_new_partstat (status);
        icalproperty_add_parameter (prop, param);
    }
}

static void
prev_clicked_cb (GtkWidget *widget, gpointer data) 
{
    EItipControl *itip = E_ITIP_CONTROL (data);
    EItipControlPrivate *priv;

    priv = itip->priv;
    
    priv->current--;
    priv->ical_comp = get_prev (&priv->iter);

    show_current (itip);
}

static void
next_clicked_cb (GtkWidget *widget, gpointer data)
{
    EItipControl *itip = E_ITIP_CONTROL (data);
    EItipControlPrivate *priv;

    priv = itip->priv;
    
    priv->current++;
    priv->ical_comp = get_next (&priv->iter);

    show_current (itip);
}

static void
ok_clicked_cb (GtkWidget *widget, gpointer data)
{
    EItipControl *itip = E_ITIP_CONTROL (data);
    EItipControlPrivate *priv;
    gint selection;
    
    priv = itip->priv;

    selection = e_dialog_option_menu_get (priv->options, priv->map);

    if (priv->map == publish_map) {
        update_item (itip);
    } else if (priv->map == request_map) {
        gboolean rsvp = FALSE;
        
        switch (selection) {
        case ACCEPT_TO_CALENDAR_RSVP:
            rsvp = TRUE;
        case ACCEPT_TO_CALENDAR:
            change_status (itip, priv->my_address, ICAL_PARTSTAT_ACCEPTED);
            break;
        case TENTATIVE_TO_CALENDAR_RSVP:
            rsvp = TRUE;
        case TENTATIVE_TO_CALENDAR:
            change_status (itip, priv->my_address, ICAL_PARTSTAT_TENTATIVE);
            break;
        case DECLINE_TO_CALENDAR_RSVP:
            rsvp = TRUE;
        case DECLINE_TO_CALENDAR:
            change_status (itip, priv->my_address, ICAL_PARTSTAT_DECLINED);
            break;
        }
        update_item (itip);
        if (rsvp)
            itip_send_comp (CAL_COMPONENT_METHOD_REPLY, priv->comp);

    } else if (priv->map == request_fb_map) {
        send_freebusy (itip);

    } else if (priv->map == reply_map) {
        update_item (itip);

    } else if (priv->map == cancel_map) {
        remove_item (itip);
    }
}