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 <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#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 <gtkhtml/gtkhtml.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 *html;
    
    GtkWidget *count;
    GtkWidget *next;
    GtkWidget *prev;

    CalClient *event_client;
    CalClient *task_client;

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

    int current;
    int total;

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

/* HTML Strings */
#define HTML_HEADER     "<html><head><title> Evolution Meeting Request</title></head>"
#define HTML_BODY_START "<body bgcolor=\"#ffffff\" text=\"#000000\" link=\"#336699\">"
#define HTML_SEP        "<hr color=#336699 align=\"left\" width=450>"
#define HTML_BODY_END   "</body>"
#define HTML_FOOTER     "</html>"

#define PUBLISH_OPTIONS "<form><b>Choose an action:</b>&nbsp<select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"U\">Update</option></select>&nbsp &nbsp \
<input TYPE=Submit name=\"ok\" value=\"OK\"></form>"

#define REQUEST_OPTIONS "<form><b>Choose an action:</b>&nbsp<select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"A\">Accept</option> \
<option VALUE=\"T\">Tentatively accept</option> \
<option VALUE=\"D\">Decline</option></select>&nbsp \
<input TYPE=\"checkbox\" name=\"rsvp\" value=\"1\" checked>RSVP&nbsp&nbsp\
<input TYPE=\"submit\" name=\"ok\" value=\"OK\"><br> \
</form>"

#define REQUEST_FB_OPTIONS "<form><b>Choose an action:</b><select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"F\">Send Free/Busy Information</option></select>&nbsp &nbsp \
<input TYPE=Submit name=\"ok\" value=\"OK\"></form>"

#define REPLY_OPTIONS "<form><b>Choose an action:</b><select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"R\">Update</option></select>&nbsp &nbsp \
<input TYPE=Submit name=\"ok\" value=\"OK\"></form>"

#define REFRESH_OPTIONS "<form><b>Choose an action:</b><select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"S\">Send Latest Information</option></select>&nbsp &nbsp \
<input TYPE=Submit name=\"ok\" value=\"OK\"></form>"

#define CANCEL_OPTIONS "<form><b>Choose an action:</b><select NAME=\"action\" SIZE=\"1\"> \
<option VALUE=\"C\">Cancel</option></select>&nbsp &nbsp \
<input TYPE=Submit name=\"ok\" value=\"OK\"></form>"


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 url_requested_cb (GtkHTML *html, const gchar *url, GtkHTMLStream *handle, gpointer data);
static void ok_clicked_cb (GtkHTML *html, const gchar *method, const gchar *url, const gchar *encoding, 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, *scrolled_window;
    
    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);

    /* 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");
    if (priv->task_client == NULL)
        g_warning ("Unable to start calendar client");

    /* Html Widget */
    priv->html = gtk_html_new ();
    gtk_widget_show (priv->html);

    scrolled_window = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
                    GTK_POLICY_AUTOMATIC,
                    GTK_POLICY_AUTOMATIC);
    gtk_widget_show (scrolled_window);
    
    gtk_container_add (GTK_CONTAINER (scrolled_window), priv->html);
    gtk_widget_set_usize (scrolled_window, 600, 400);
    gtk_box_pack_start (GTK_BOX (itip), scrolled_window, FALSE, FALSE, 4);

    gtk_signal_connect (GTK_OBJECT (priv->html), "url_requested",
                url_requested_cb, itip);
    gtk_signal_connect (GTK_OBJECT (priv->html), "submit",
                ok_clicked_cb, itip);

}

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

    priv = itip->priv;

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

    if (priv->comp)
        gtk_object_unref (GTK_OBJECT (priv->comp));
    priv->comp = NULL;
    
    icalcomponent_free (priv->top_level);
    priv->top_level = NULL;
    icalcomponent_free (priv->main_comp);
    priv->main_comp = NULL;
    priv->ical_comp = NULL;

    priv->current = 0;
    priv->total = 0;

    itip_addresses_free (priv->addresses);
    priv->addresses = NULL;

    priv->my_address = NULL;
    g_free (priv->from_address);
    priv->from_address = NULL;
}

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

    priv = itip->priv;

    clean_up (itip);
    
    gtk_object_unref (GTK_OBJECT (priv->event_client));
    gtk_object_unref (GTK_OBJECT (priv->task_client));
    
    g_free (priv);

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

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);
        
        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 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 (GtkHTML *html, GtkHTMLStream *html_stream, CalComponent *comp)
{
    CalComponentDateTime datetime;
    time_t start = 0, end = 0, complete = 0, due = 0;
    static char buffer[1024];
    gboolean wrote = FALSE;
    
    /* FIXME: timezones. */
    buffer[0] = '\0';
    cal_component_get_dtstart (comp, &datetime);    
    if (datetime.value) {
        start = icaltime_as_timet (*datetime.value);
        write_label_piece (start, buffer, 1024, "Meeting begins: <b>", "</b><br>");
        gtk_html_write (html, html_stream, buffer, strlen(buffer));
        wrote = TRUE;
    }
    cal_component_free_datetime (&datetime);    

    buffer[0] = '\0';
    cal_component_get_dtend (comp, &datetime);
    if (datetime.value){
        end = icaltime_as_timet (*datetime.value);
        write_label_piece (end, buffer, 1024, "Meeting ends: <b>", "</b><br>");
        gtk_html_write (html, html_stream, buffer, strlen (buffer));
        wrote = TRUE;
    }
    cal_component_free_datetime (&datetime);    

    buffer[0] = '\0';
    datetime.tzid = NULL;
    cal_component_get_completed (comp, &datetime.value);
    if (datetime.value) {
        complete = icaltime_as_timet (*datetime.value);
        write_label_piece (complete, buffer, 1024, "Completed: <b>", "</b><br>");
        gtk_html_write (html, html_stream, buffer, strlen (buffer));
        wrote = TRUE;
    }
    cal_component_free_datetime (&datetime);

    buffer[0] = '\0';
    cal_component_get_due (comp, &datetime);
    if (complete == 0 && datetime.value) {
        due = icaltime_as_timet (*datetime.value);
        write_label_piece (due, buffer, 1024, "Due: <b>", "</b><br>");
        gtk_html_write (html, html_stream, buffer, strlen (buffer));
        wrote = TRUE;
    }
    cal_component_free_datetime (&datetime);

    if (wrote)
        gtk_html_write (html, html_stream, "<br>", 8);
}

static void
set_message (GtkHTML *html, GtkHTMLStream *html_stream, gchar *message, gboolean err) 
{
    char *buffer;
    
    if (message == NULL)
        return;

    if (err) {
        buffer = g_strdup_printf ("<b><font color=\"#ff0000\">%s</font></b><br><br>", message);
    } else {
        buffer = g_strdup_printf ("<b>%s</b><br><br>", message);
    }
    gtk_html_write (GTK_HTML (html), html_stream, buffer, strlen (buffer));
    g_free (buffer);        
}

static void
write_html (EItipControl *itip, gchar *itip_desc, gchar *itip_title, gchar *options) 
{
    EItipControlPrivate *priv;
    GtkHTMLStream *html_stream;
    CalComponentText text;
    CalComponentOrganizer organizer;
    GSList *l = NULL;
    gchar *html;
    
    priv = itip->priv;

    /* Html widget */
    html_stream = gtk_html_begin (GTK_HTML (priv->html));
    gtk_html_write (GTK_HTML (priv->html), html_stream, 
            HTML_HEADER, strlen(HTML_HEADER));
    gtk_html_write (GTK_HTML (priv->html), html_stream,
            HTML_BODY_START, strlen(HTML_BODY_START));

    /* The table */
    html = g_strdup ("<table width=450 cellspacing=\"0\" cellpadding=\"4\" border=\"0\">");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    /* The column for the image */
    html = g_strdup ("<tr><td width=48 align=\"center\" valign=\"top\" rowspan=\"8\">");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    /* The image */
    html = g_strdup ("<img src=\"/talking-heads.png\"></td>");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    html = g_strdup ("<td align=\"left\" valign=\"top\">");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    /* The organizer */
    cal_component_get_organizer (priv->comp, &organizer);
    if (organizer.value != NULL) {
        html = g_strdup_printf (itip_desc,
                    organizer.cn ? organizer.cn : organizer.value);
        gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
        g_free (html);
    }

    /* Describe what the user can do */
    html = g_strdup ("<br> Please review the following information, "
             "and then select an action from the menu below.");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);
    
    /* Separator */
    gtk_html_write (GTK_HTML (priv->html), html_stream, HTML_SEP, strlen (HTML_SEP));

    /* Title */
    set_message (GTK_HTML (priv->html), html_stream, itip_title, FALSE);

    /* Date information */
    set_date_label (GTK_HTML (priv->html), html_stream, priv->comp);

    /* Summary */
    cal_component_get_summary (priv->comp, &text);
    html = g_strdup_printf ("<b>Summary:</b> %s<br><br>", text.value ? text.value : "<i>None</i>");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    /* Description */
    cal_component_get_description_list (priv->comp, &l);
    if (l)
        text = *((CalComponentText *)l->data);

    if (l && text.value) {
        html = g_strdup_printf ("<b>Description:</b> %s", text.value);
        gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
        g_free (html);
    }
    cal_component_free_text_list (l);

    /* Separator */
    gtk_html_write (GTK_HTML (priv->html), html_stream, HTML_SEP, strlen (HTML_SEP));

    /* Options */
    if (options != NULL)
        gtk_html_write (GTK_HTML (priv->html), html_stream, options, strlen (options));

    html = g_strdup ("</td></tr></table>");
    gtk_html_write (GTK_HTML (priv->html), html_stream, html, strlen(html));
    g_free (html);

    gtk_html_write (GTK_HTML (priv->html), html_stream,
            HTML_BODY_END, strlen(HTML_BODY_END));
    gtk_html_write (GTK_HTML (priv->html), html_stream,
            HTML_FOOTER, strlen(HTML_FOOTER));

    gtk_html_end (GTK_HTML (priv->html), html_stream, GTK_HTML_STREAM_OK);
}


static void
show_current_event (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    gchar *itip_title, *itip_desc, *options;
    
    priv = itip->priv;

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        itip_desc = _("<b>%s</b> has published meeting information.");
        itip_title = _("Meeting Information");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REQUEST:
        itip_desc = _("<b>%s</b> requests your presence at a meeting.");
        itip_title = _("Meeting Proposal");
        options = REQUEST_OPTIONS;
        break;
    case ICAL_METHOD_ADD:
        itip_desc = _("<b>%s</b> wishes to add to an existing meeting.");
        itip_title = _("Meeting Update");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REFRESH:
        itip_desc = _("<b>%s</b> wishes to receive the latest meeting information.");
        itip_title = _("Meeting Update Request");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REPLY:
        itip_desc = _("<b>%s</b> has replyed to a meeting request.");
        itip_title = _("Meeting Reply");
        options = REPLY_OPTIONS;
        break;
    case ICAL_METHOD_CANCEL:
        itip_desc = _("<b>%s</b> has cancelled a meeting.");
        itip_title = _("Meeting Cancellation");
        options = CANCEL_OPTIONS;
        break;
    default:
        itip_desc = _("<b>%s</b> has sent an unintelligible message.");
        itip_title = _("Bad Meeting Message");
        options = NULL;
    }

    write_html (itip, itip_desc, itip_title, options);
}

static void
show_current_todo (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    gchar *itip_title, *itip_desc, *options;
    
    priv = itip->priv;

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        itip_desc = _("<b>%s</b> has published task information.");
        itip_title = _("Task Information");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REQUEST:
        itip_desc = _("<b>%s</b> requests you perform a task.");
        itip_title = _("Task Proposal");
        options = REQUEST_OPTIONS;
        break;
    case ICAL_METHOD_ADD:
        itip_desc = _("<b>%s</b> wishes to add to an existing task.");
        itip_title = _("Task Update");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REFRESH:
        itip_desc = _("<b>%s</b> wishes to receive the latest task information.");
        itip_title = _("Task Update Request");
        options = PUBLISH_OPTIONS;
        break;
    case ICAL_METHOD_REPLY:
        itip_desc = _("<b>%s</b> has replyed to a task assignment.");
        itip_title = _("Task Reply");
        options = REPLY_OPTIONS;
        break;
    case ICAL_METHOD_CANCEL:
        itip_desc = _("<b>%s</b> has cancelled a task.");
        itip_title = _("Task Cancellation");
        options = CANCEL_OPTIONS;
        break;
    default:
        itip_desc = _("<b>%s</b> has sent an unintelligible message.");
        itip_title = _("Bad Task Message");
        options = NULL;
    }

    write_html (itip, itip_desc, itip_title, options);
}

static void
show_current_freebusy (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    gchar *itip_title, *itip_desc, *options;
    
    priv = itip->priv;

    switch (priv->method) {
    case ICAL_METHOD_PUBLISH:
        itip_desc = _("<b>%s</b> has published free/busy information.");
        itip_title = _("Free/Busy Information");
        options = NULL;
        break;
    case ICAL_METHOD_REQUEST:
        itip_desc = _("<b>%s</b> requests your free/busy information.");
        itip_title = _("Free/Busy Request");
        options = REQUEST_FB_OPTIONS;
        break;
    case ICAL_METHOD_REPLY:
        itip_desc = _("<b>%s</b> has replyed to a free/busy request.");
        itip_title = _("Free/Busy Reply");
        options = NULL;
        break;
    default:
        itip_desc = _("<b>%s</b> has sent an unintelligible message.");
        itip_title = _("Bad Free/Busy Message");
        options = NULL;
    }

    write_html (itip, itip_desc, itip_title, options);
}

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;
    icalcomponent *tz_comp;
    icalcompiter tz_iter;
    
    priv = itip->priv;

    clean_up (itip);
    
    priv->vcalendar = g_strdup (text);
    priv->top_level = cal_util_new_top_level ();

    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);
    if (prop == NULL)
        goto show;
    priv->method = icalproperty_get_method (prop);

    tz_iter = icalcomponent_begin_component (priv->main_comp, ICAL_VTIMEZONE_COMPONENT);
    while ((tz_comp = icalcompiter_deref (&tz_iter)) != NULL) {
        icalcomponent *clone;
        
        clone = icalcomponent_new_clone (tz_comp);
        icalcomponent_add_component (priv->top_level, clone);

        icalcompiter_next (&tz_iter);
    }

    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;
    icalcomponent *clone;
    CalClient *client;
    CalComponentVType type;
    GtkWidget *dialog;
    
    priv = itip->priv;

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

    clone = icalcomponent_new_clone (priv->ical_comp);
    icalcomponent_add_component (priv->top_level, clone);
    
    if (!cal_client_update_objects (client, priv->top_level))
        dialog = gnome_warning_dialog (_("I couldn't update your calendar file!\n"));
    else
        dialog = gnome_ok_dialog (_("Update complete\n"));
    gnome_dialog_run_and_close (GNOME_DIALOG (dialog));

    icalcomponent_remove_component (priv->top_level, clone);
}

static void
remove_item (EItipControl *itip) 
{
    EItipControlPrivate *priv;
    CalClient *client;
    CalComponentVType type;
    const char *uid;
    GtkWidget *dialog;
    
    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))
        dialog = gnome_warning_dialog (_("I couldn't remove the item from your calendar file!\n"));
    else
        dialog = gnome_ok_dialog (_("Removal Complete"));
    gnome_dialog_run_and_close (GNOME_DIALOG (dialog));
}

static void
send_item (EItipControl *itip)
{
    EItipControlPrivate *priv;
    CalComponent *comp;
    CalComponentVType type;
    const char *uid;
    CalClientGetStatus status;
    GtkWidget *dialog;

    priv = itip->priv;
    
    type = cal_component_get_vtype (priv->comp);
    cal_component_get_uid (priv->comp, &uid);

    switch (type) {
    case CAL_COMPONENT_EVENT:
        status = cal_client_get_object (priv->event_client, uid, &comp);
        break;
    case CAL_COMPONENT_TODO:
        status = cal_client_get_object (priv->task_client, uid, &comp);
        break;
    default:
        status = CAL_CLIENT_GET_NOT_FOUND;
    }

    if (status == CAL_CLIENT_GET_SUCCESS) {
        itip_send_comp (CAL_COMPONENT_METHOD_PUBLISH, comp);
        dialog = gnome_ok_dialog (_("Item sent!\n"));
    } else {
        dialog = gnome_warning_dialog (_("The item could not be send!\n"));
    }
    gnome_dialog_run_and_close (GNOME_DIALOG (dialog));
}

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

    priv = itip->priv;
    
    /* FIXME: timezones and free these. */
    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);
        dialog = gnome_ok_dialog (_("Item sent!\n"));
    } else {
        dialog = gnome_warning_dialog (_("The item could not be send!\n"));
    }
    gnome_dialog_run_and_close (GNOME_DIALOG (dialog));
}

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
url_requested_cb (GtkHTML *html, const gchar *url, GtkHTMLStream *handle, gpointer data)
{   unsigned char buffer[4096];
    int len, fd;
        char *path;

    path = g_strdup_printf ("%s/%s", EVOLUTION_ICONSDIR, url);
    
    if ((fd = open (path, O_RDONLY)) == -1) {
        g_warning ("%s", g_strerror (errno));
        goto cleanup;
    }
      
        while ((len = read (fd, buffer, 4096)) > 0) {
        gtk_html_write (html, handle, buffer, len);
    }

    if (len < 0) {
        /* check to see if we stopped because of an error */
        gtk_html_end (html, handle, GTK_HTML_STREAM_ERROR);
        g_warning ("%s", g_strerror (errno));
        goto cleanup;
    }   
    /* done with no errors */
    gtk_html_end (html, handle, GTK_HTML_STREAM_OK);
    close (fd);

 cleanup:
    g_free (path);
}

static void
ok_clicked_cb (GtkHTML *html, const gchar *method, const gchar *url, const gchar *encoding, gpointer data)
{
    EItipControl *itip = E_ITIP_CONTROL (data);
    EItipControlPrivate *priv;
    gchar **fields;
    gboolean rsvp = FALSE;
    int i;
    
    priv = itip->priv;
    
    fields = g_strsplit (encoding, "&", -1);
    for (i = 0; fields[i] != NULL; i++) {
        gchar **key_value;

        key_value = g_strsplit (fields[i], "=", 2);

        if (key_value[0] != NULL && !strcmp (key_value[0], "action")) {
            if (key_value[1] == NULL)
                break;
            
            switch (key_value[1][0]) {
            case 'U':
                update_item (itip);
                break;
            case 'A':
                change_status (itip, priv->my_address, ICAL_PARTSTAT_ACCEPTED);
                update_item (itip);
                break;
            case 'T':
                change_status (itip, priv->my_address, ICAL_PARTSTAT_TENTATIVE);
                update_item (itip);
                break;
            case 'D':
                change_status (itip, priv->my_address, ICAL_PARTSTAT_DECLINED);
                update_item (itip);
                break;
            case 'F':
                send_freebusy (itip);
                break;
            case 'R':
                update_item (itip);
                break;
            case 'S':
                send_item (itip);
                break;
            case 'C':
                remove_item (itip);
                break;
            }
        }       

        if (key_value[0] != NULL && !strcmp (key_value[0], "rsvp"))
            if (*key_value[1] == '1')
                rsvp = TRUE;
        
        g_strfreev (key_value);

    }
    g_strfreev (fields);

    if (rsvp)
        itip_send_comp (CAL_COMPONENT_METHOD_REPLY, priv->comp);            
}