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

/*
 * Evolution calendar - Main page of the task editor dialog
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 *
 * Authors:
 *      Federico Mena-Quintero <federico@ximian.com>
 *      Miguel de Icaza <miguel@ximian.com>
 *      Seth Alves <alves@hungry.com>
 *      JP Rosevear <jpr@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <string.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <gdk/gdkkeysyms.h>

#include "e-util/e-util.h"

#include "../e-meeting-attendee.h"
#include "../e-meeting-list-view.h"
#include "../e-meeting-store.h"
#include "../e-timezone-entry.h"

#include "comp-editor.h"
#include "comp-editor-util.h"
#include "e-send-options-utils.h"
#include "task-page.h"

#define TASK_PAGE_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), TYPE_TASK_PAGE, TaskPagePrivate))

struct _TaskPagePrivate {
    GtkBuilder *builder;

    /* Widgets from the UI file */
    GtkWidget *main;

    gchar **address_strings;
    gchar *fallback_address;
    EMeetingAttendee *ia;
    gchar *user_add;
    ECalComponent *comp;

    /* For meeting/event */
    GtkWidget *calendar_label;
    GtkWidget *org_cal_label;
    GtkWidget *attendee_box;

    /* Lists of attendees */
    GPtrArray *deleted_attendees;

    /* Generic informative messages placeholder */
    GtkWidget *info_hbox;
    GtkWidget *info_icon;
    GtkWidget *info_string;

    GtkWidget *summary;
    GtkWidget *summary_label;

    GtkWidget *due_date;
    GtkWidget *start_date;
    GtkWidget *completed_date;
    GtkWidget *timezone;
    GtkWidget *timezone_label;

    GtkWidget *status_combo;
    GtkWidget *priority_combo;
    GtkWidget *percent_complete;
    GtkWidget *classification_combo;
    GtkWidget *web_page_entry;

    GtkWidget *description;

    GtkWidget *categories_btn;
    GtkWidget *categories;

    GtkWidget *client_combo_box;

    /* Meeting related items */
    GtkWidget *list_box;
    GtkWidget *organizer_table;
    GtkWidget *organizer;
    GtkWidget *add;
    GtkWidget *remove;
    GtkWidget *edit;
    GtkWidget *invite;

    /* ListView stuff */
    ECalClient *client;
    EMeetingStore *meeting_store;
    EMeetingListView *list_view;
    gint row;

    /* For handling who the organizer is */
    gboolean user_org;
    gboolean existing;

    gboolean sendoptions_shown;
    gboolean is_assignment;

    ESendOptionsDialog *sod;

    GCancellable *connect_cancellable;
};

static const gint classification_map[] = {
    E_CAL_COMPONENT_CLASS_PUBLIC,
    E_CAL_COMPONENT_CLASS_PRIVATE,
    E_CAL_COMPONENT_CLASS_CONFIDENTIAL,
    -1
};

/* Note that these two arrays must match. */
static const gint status_map[] = {
    ICAL_STATUS_NONE,
    ICAL_STATUS_INPROCESS,
    ICAL_STATUS_COMPLETED,
    ICAL_STATUS_CANCELLED,
    -1
};

typedef enum {
    PRIORITY_HIGH,
    PRIORITY_NORMAL,
    PRIORITY_LOW,
    PRIORITY_UNDEFINED
} TaskEditorPriority;

static const gint priority_map[] = {
    PRIORITY_HIGH,
    PRIORITY_NORMAL,
    PRIORITY_LOW,
    PRIORITY_UNDEFINED,
    -1
};

static gboolean task_page_fill_timezones (CompEditorPage *page, GHashTable *timezones);
static void task_page_select_organizer (TaskPage *tpage, const gchar *backend_address);
static void set_subscriber_info_string (TaskPage *tpage, const gchar *backend_address);

G_DEFINE_TYPE (TaskPage, task_page, TYPE_COMP_EDITOR_PAGE)

static TaskEditorPriority
priority_value_to_index (gint priority_value)
{
    TaskEditorPriority retval;

    if (priority_value == 0)
        retval = PRIORITY_UNDEFINED;
    else if (priority_value <= 4)
        retval = PRIORITY_HIGH;
    else if (priority_value == 5)
        retval = PRIORITY_NORMAL;
    else
        retval = PRIORITY_LOW;

    return retval;
}

static gint
priority_index_to_value (TaskEditorPriority priority)
{
    gint retval;

    switch (priority) {
    case PRIORITY_UNDEFINED:
        retval = 0;
        break;
    case PRIORITY_HIGH:
        retval = 3;
        break;
    case PRIORITY_NORMAL:
        retval = 5;
        break;
    case PRIORITY_LOW:
        retval = 7;
        break;
    default:
        retval = 0;
        break;
    }

    return retval;
}

static gboolean
get_current_identity (TaskPage *page,
                      gchar **name,
                      gchar **mailto)
{
    EShell *shell;
    CompEditor *editor;
    ESourceRegistry *registry;
    GList *list, *iter;
    GtkWidget *entry;
    const gchar *extension_name;
    const gchar *text;
    gboolean match = FALSE;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    shell = comp_editor_get_shell (editor);

    entry = gtk_bin_get_child (GTK_BIN (page->priv->organizer));
    text = gtk_entry_get_text (GTK_ENTRY (entry));

    if (text == NULL || *text == '\0')
        return FALSE;

    registry = e_shell_get_registry (shell);
    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;

    list = e_source_registry_list_sources (registry, extension_name);

    for (iter = list; !match && iter != NULL; iter = g_list_next (iter)) {
        ESource *source = E_SOURCE (iter->data);
        ESourceMailIdentity *extension;
        const gchar *id_name;
        const gchar *id_address;
        gchar *identity;

        extension = e_source_get_extension (source, extension_name);

        id_name = e_source_mail_identity_get_name (extension);
        id_address = e_source_mail_identity_get_address (extension);

        if (id_name == NULL || id_address == NULL)
            continue;

        identity = g_strdup_printf ("%s <%s>", id_name, id_address);
        match = (g_ascii_strcasecmp (text, identity) == 0);
        g_free (identity);

        if (match && name != NULL)
            *name = g_strdup (id_name);

        if (match && mailto != NULL)
            *mailto = g_strdup_printf ("MAILTO:%s", id_address);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    return match;
}

/* Fills the widgets with default values */
static void
clear_widgets (TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    /* Summary, description */
    gtk_entry_set_text (GTK_ENTRY (priv->summary), "");
    gtk_text_buffer_set_text (gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)), "", 0);
    e_buffer_tagger_update_tags (GTK_TEXT_VIEW (priv->description));

    /* Start, due times - both set to None */
    e_date_edit_set_time (E_DATE_EDIT (priv->start_date), -1);
    e_date_edit_set_time (E_DATE_EDIT (priv->due_date), -1);

    /* Classification */
    comp_editor_set_classification (editor, E_CAL_COMPONENT_CLASS_PUBLIC);

    /* Categories */
    gtk_entry_set_text (GTK_ENTRY (priv->categories), "");

    e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), -1);
    e_dialog_combo_box_set (priv->status_combo, ICAL_STATUS_NONE, status_map);
    e_dialog_combo_box_set (priv->priority_combo, PRIORITY_UNDEFINED, priority_map);
    gtk_spin_button_set_value (GTK_SPIN_BUTTON (priv->percent_complete), 0);

    gtk_entry_set_text (GTK_ENTRY (priv->web_page_entry), "");
}

static gboolean
date_in_past (TaskPage *tpage,
              EDateEdit *date)
{
    struct icaltimetype tt = icaltime_null_time ();

    if (!e_date_edit_get_date (date, &tt.year, &tt.month, &tt.day))
        return FALSE;

    if (e_date_edit_get_time_of_day (date, &tt.hour, &tt.minute))
        tt.zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (tpage->priv->timezone));
    else
        tt.is_date = TRUE;

    return comp_editor_test_time_in_the_past (tt);
}

/* returns whether changed info text */
static gboolean
check_starts_in_the_past (TaskPage *tpage)
{
    TaskPagePrivate *priv;
    gboolean start_in_past, due_in_past;

    if ((comp_editor_get_flags (comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage))) & COMP_EDITOR_NEW_ITEM) == 0)
        return FALSE;

    priv = tpage->priv;
    start_in_past = date_in_past (tpage, E_DATE_EDIT (priv->start_date));
    due_in_past = date_in_past (tpage, E_DATE_EDIT (priv->due_date));

    if (start_in_past || due_in_past) {
        gchar *tmp = g_strconcat (
            "<b>", start_in_past ? _("Task's start date is in the past") : "",
            start_in_past && due_in_past ? "\n" : "", due_in_past ? _("Task's due date is in the past") : "", "</b>", NULL);
        task_page_set_info_string (tpage, "dialog-warning", tmp);
        g_free (tmp);
    } else {
        task_page_set_info_string (tpage, NULL, NULL);
    }

    return TRUE;
}

static void
sensitize_widgets (TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECalClient *client;
    GtkActionGroup *action_group;
    GtkAction *action;
    gboolean read_only, sens = TRUE, sensitize;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    read_only = e_client_is_readonly (E_CLIENT (client));

    if (flags & COMP_EDITOR_IS_ASSIGNED)
        sens = flags & COMP_EDITOR_USER_ORG;

    sensitize = (!read_only && sens);

    if (read_only) {
        gchar *tmp = g_strconcat ("<b>", _("Task cannot be edited, because the selected task list is read only"), "</b>", NULL);
        task_page_set_info_string (tpage, "dialog-information", tmp);
        g_free (tmp);
    } else if (!sens) {
        gchar *tmp = g_strconcat ("<b>", _("Task cannot be fully edited, because you are not the organizer"), "</b>", NULL);
        task_page_set_info_string (tpage, "dialog-information", tmp);
        g_free (tmp);
    } else if ((flags & COMP_EDITOR_IS_ASSIGNED) != 0 && e_client_check_capability (E_CLIENT (client), CAL_STATIC_CAPABILITY_NO_TASK_ASSIGNMENT)) {
        gchar *tmp = g_strconcat ("<b>", _("Task cannot be edited, because the selected task list does not support assigned tasks"), "</b>", NULL);
        task_page_set_info_string (tpage, "dialog-information", tmp);
        g_free (tmp);
        sens = FALSE;
        read_only = TRUE;
    } else if (!check_starts_in_the_past (tpage)) {
        task_page_set_info_string (tpage, NULL, NULL);
    }

    /* The list of organizers is set to be non-editable. Otherwise any
     * change in the displayed list causes an 'Account not found' error.
     */
    gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->organizer))), FALSE);

    gtk_editable_set_editable (GTK_EDITABLE (priv->summary), !read_only);
    gtk_widget_set_sensitive (priv->due_date, !read_only);
    gtk_widget_set_sensitive (priv->start_date, !read_only);
    gtk_widget_set_sensitive (priv->timezone, !read_only);
    gtk_widget_set_sensitive (priv->description, !read_only);
    gtk_widget_set_sensitive (priv->categories_btn, !read_only);
    gtk_editable_set_editable (GTK_EDITABLE (priv->categories), !read_only);

    gtk_widget_set_sensitive (priv->completed_date, !read_only);
    gtk_widget_set_sensitive (priv->status_combo, !read_only);
    gtk_widget_set_sensitive (priv->priority_combo, !read_only);
    gtk_widget_set_sensitive (priv->percent_complete, !read_only);
    gtk_widget_set_sensitive (priv->classification_combo, !read_only);

    gtk_editable_set_editable (
        GTK_EDITABLE (priv->web_page_entry), !read_only);

    gtk_widget_set_sensitive (priv->organizer, !read_only);
    gtk_widget_set_sensitive (priv->add, (!read_only && sens));
    gtk_widget_set_sensitive (priv->edit, (!read_only && sens));
    e_meeting_list_view_set_editable (priv->list_view, (!read_only && sens));
    gtk_widget_set_sensitive (priv->remove, (!read_only && sens));
    gtk_widget_set_sensitive (priv->invite, (!read_only && sens));
    gtk_widget_set_sensitive (GTK_WIDGET (priv->list_view), !read_only);

    action_group = comp_editor_get_action_group (editor, "editable");
    gtk_action_group_set_sensitive (action_group, !read_only);

    action_group = comp_editor_get_action_group (editor, "individual");
    gtk_action_group_set_sensitive (action_group, sensitize);

    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_sensitive (action, sensitize);

    if (!priv->is_assignment) {
        gtk_widget_hide (priv->calendar_label);
        gtk_widget_hide (priv->list_box);
        gtk_widget_hide (priv->attendee_box);
        gtk_widget_hide (priv->organizer);
        gtk_widget_hide (priv->invite);
        gtk_label_set_text_with_mnemonic (GTK_LABEL (priv->org_cal_label), _("_List:"));
        gtk_label_set_mnemonic_widget (GTK_LABEL (priv->org_cal_label), priv->client_combo_box);
    } else {
        gtk_widget_show (priv->invite);
        gtk_widget_show (priv->calendar_label);
        gtk_widget_show (priv->list_box);
        gtk_widget_show (priv->attendee_box);
        gtk_widget_show (priv->organizer);
        gtk_label_set_text_with_mnemonic (GTK_LABEL (priv->org_cal_label), _("Organi_zer:"));
        gtk_label_set_mnemonic_widget (GTK_LABEL (priv->org_cal_label), priv->organizer);
    }
}

static void
set_attendees (ECalComponent *comp,
               const GPtrArray *attendees)
{
    GSList *comp_attendees = NULL, *l;
    gint i;

    for (i = 0; i < attendees->len; i++) {
        EMeetingAttendee *ia = g_ptr_array_index (attendees, i);
        ECalComponentAttendee *ca;

        ca = e_meeting_attendee_as_e_cal_component_attendee (ia);

        comp_attendees = g_slist_prepend (comp_attendees, ca);

    }
    comp_attendees = g_slist_reverse (comp_attendees);

    e_cal_component_set_attendee_list (comp, comp_attendees);

    for (l = comp_attendees; l != NULL; l = l->next)
        g_free (l->data);
    g_slist_free (comp_attendees);
}

static void
organizer_changed_cb (GtkEntry *entry,
                      TaskPage *tpage)
{
    gchar *name;
    gchar *mailto;

    g_return_if_fail (GTK_IS_ENTRY (entry));
    g_return_if_fail (IS_TASK_PAGE (tpage));

    if (!tpage->priv->ia)
        return;

    if (!get_current_identity (tpage, &name, &mailto))
        return;

    /* XXX EMeetingAttendee takes ownership of the strings. */
    e_meeting_attendee_set_cn (tpage->priv->ia, name);
    e_meeting_attendee_set_address (tpage->priv->ia, mailto);
}

static void
task_page_dispose (GObject *object)
{
    TaskPagePrivate *priv;

    priv = TASK_PAGE_GET_PRIVATE (object);

    if (priv->connect_cancellable != NULL) {
        g_cancellable_cancel (priv->connect_cancellable);
        g_object_unref (priv->connect_cancellable);
        priv->connect_cancellable = NULL;
    }

    if (priv->main != NULL) {
        g_object_unref (priv->main);
        priv->main = NULL;
    }

    if (priv->builder != NULL) {
        g_object_unref (priv->builder);
        priv->builder = NULL;
    }

    if (priv->sod != NULL) {
        g_object_unref (priv->sod);
        priv->sod = NULL;
    }

    if (priv->comp != NULL) {
        g_object_unref (priv->comp);
        priv->comp = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (task_page_parent_class)->dispose (object);
}

static void
task_page_finalize (GObject *object)
{
    TaskPagePrivate *priv;

    priv = TASK_PAGE_GET_PRIVATE (object);

    g_strfreev (priv->address_strings);
    g_free (priv->fallback_address);

    g_ptr_array_foreach (
        priv->deleted_attendees, (GFunc) g_object_unref, NULL);
    g_ptr_array_free (priv->deleted_attendees, TRUE);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (task_page_parent_class)->finalize (object);
}

static GtkWidget *
task_page_get_widget (CompEditorPage *page)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    return priv->main;
}

static void
task_page_focus_main_widget (CompEditorPage *page)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    gtk_widget_grab_focus (priv->summary);
}

static gboolean
task_page_fill_widgets (CompEditorPage *page,
                        ECalComponent *comp)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    ECalComponentText text;
    ECalComponentDateTime d;
    ECalComponentClassification cl;
    ESourceRegistry *registry;
    CompEditor *editor;
    CompEditorFlags flags;
    GtkAction *action;
    ECalClient *client;
    EShell *shell;
    GSList *l;
    icalcomponent *icalcomp = NULL;
    const gchar *categories, *uid;
    icaltimezone *zone, *default_zone;
    gchar *backend_addr = NULL;
    gboolean active;
    gint *priority_value, *percent = NULL;
    TaskEditorPriority priority;
    icalproperty_status status;
    const gchar *url;
    struct icaltimetype *completed = NULL;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);
    shell = comp_editor_get_shell (editor);

    registry = e_shell_get_registry (shell);

    /* Clean out old data */
    if (priv->comp != NULL)
        g_object_unref (priv->comp);
    priv->comp = NULL;

    g_ptr_array_foreach (
        priv->deleted_attendees, (GFunc) g_object_unref, NULL);
    g_ptr_array_set_size (priv->deleted_attendees, 0);

    /* Component for cancellation */
    priv->comp = e_cal_component_clone (comp);
    comp_editor_copy_new_attendees (priv->comp, comp);

    /* Clean the screen */
    clear_widgets (tpage);

    priv->user_add = itip_get_comp_attendee (
        registry, comp, client);

        /* Summary, description(s) */
    e_cal_component_get_summary (comp, &text);
    if (text.value != NULL)
        gtk_entry_set_text (GTK_ENTRY (priv->summary), text.value);
    else
        gtk_entry_set_text (GTK_ENTRY (priv->summary), "");

    e_cal_component_get_description_list (comp, &l);
    if (l && l->data) {
        ECalComponentText *dtext;

        dtext = l->data;
        gtk_text_buffer_set_text (
            gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)),
            dtext->value ? dtext->value : "", -1);
    } else {
        gtk_text_buffer_set_text (
            gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description)),
            "", 0);
    }
    e_cal_component_free_text_list (l);
    e_buffer_tagger_update_tags (GTK_TEXT_VIEW (priv->description));

    default_zone = comp_editor_get_timezone (editor);

    /* Due Date. */
    e_cal_component_get_due (comp, &d);
    zone = NULL;
    if (d.value) {
        struct icaltimetype *due_tt = d.value;
        e_date_edit_set_date (
            E_DATE_EDIT (priv->due_date),
            due_tt->year, due_tt->month,
            due_tt->day);
        e_date_edit_set_time_of_day (E_DATE_EDIT (priv->due_date), -1, -1);
    } else {
        e_date_edit_set_time (E_DATE_EDIT (priv->due_date), -1);

        /* If no time is set, we use the default timezone, so the
         * user usually doesn't have to set this when they set the
         * date. */
        zone = NULL;
    }

    /* Note that if we are creating a new task, the timezones may not be
     * on the server, so we try to get the builtin timezone with the TZID
     * first. */
    if (!zone && d.tzid) {
        GError *error = NULL;

        e_cal_client_get_timezone_sync (
            client, d.tzid, &zone, NULL, &error);

        if (error != NULL) {
            /* FIXME: Handle error better. */
            g_warning (
                "Couldn't get timezone '%s' from server: %s",
                d.tzid ? d.tzid : "", error->message);
            g_error_free (error);
        }
    }

    e_timezone_entry_set_timezone (
        E_TIMEZONE_ENTRY (priv->timezone),
        zone ? zone : default_zone);

    action = comp_editor_get_action (editor, "view-time-zone");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_timezone (tpage, active);

    if (!(flags & COMP_EDITOR_NEW_ITEM) && !zone) {
        GtkAction *action;

        task_page_set_show_timezone (tpage, FALSE);
        action = comp_editor_get_action (editor, "view-time-zone");
        gtk_toggle_action_set_active (GTK_TOGGLE_ACTION (action), FALSE);
    }

    e_cal_component_free_datetime (&d);

    /* Start Date. */
    e_cal_component_get_dtstart (comp, &d);
    zone = NULL;
    if (d.value) {
        struct icaltimetype *start_tt = d.value;
        e_date_edit_set_date (
            E_DATE_EDIT (priv->start_date),
            start_tt->year, start_tt->month,
            start_tt->day);
        e_date_edit_set_time_of_day (E_DATE_EDIT (priv->start_date), -1, -1);
    } else {
        e_date_edit_set_time (E_DATE_EDIT (priv->start_date), -1);
    }

    e_cal_component_free_datetime (&d);

    /* Classification. */
    e_cal_component_get_classification (comp, &cl);
    comp_editor_set_classification (editor, cl);

    e_cal_component_get_uid (comp, &uid);
    e_cal_client_get_object_sync (
        client, uid, NULL, &icalcomp, NULL, NULL);
    if (icalcomp != NULL) {
        icalcomponent_free (icalcomp);
        task_page_hide_options (tpage);
    }

    /* Categories */
    e_cal_component_get_categories (comp, &categories);
    if (categories != NULL)
        gtk_entry_set_text (GTK_ENTRY (priv->categories), categories);
    else
        gtk_entry_set_text (GTK_ENTRY (priv->categories), "");

    /* Source */
    e_source_combo_box_set_active (
        E_SOURCE_COMBO_BOX (priv->client_combo_box),
        e_client_get_source (E_CLIENT (client)));

    e_client_get_backend_property_sync (E_CLIENT (client), CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS, &backend_addr, NULL, NULL);
    set_subscriber_info_string (tpage, backend_addr);

    if (priv->is_assignment) {
        ECalComponentOrganizer organizer;
        gchar *name = NULL;
        gchar *mailto = NULL;

        priv->user_add = itip_get_comp_attendee (
            registry, comp, client);

        /* Organizer strings */
        task_page_select_organizer (tpage, backend_addr);

        /* If there is an existing organizer show it properly */
        if (e_cal_component_has_organizer (comp)) {
            e_cal_component_get_organizer (comp, &organizer);
            if (organizer.value != NULL) {
                const gchar *strip = itip_strip_mailto (organizer.value);
                gchar *string;

                if (itip_organizer_is_user (registry, comp, client) ||
                    itip_sentby_is_user (registry, comp, client)) {
                    priv->user_org = TRUE;
                } else {
                    if (e_client_check_capability (E_CLIENT (client), CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS))
                        gtk_widget_set_sensitive (priv->invite, FALSE);
                    gtk_widget_set_sensitive (priv->add, FALSE);
                    gtk_widget_set_sensitive (priv->edit, FALSE);
                    gtk_widget_set_sensitive (priv->remove, FALSE);
                    priv->user_org = FALSE;
                }

                if (e_client_check_capability (E_CLIENT (client), CAL_STATIC_CAPABILITY_NO_ORGANIZER) && (flags & COMP_EDITOR_DELEGATE))
                    string = g_strdup (priv->user_add);
                else if (organizer.cn != NULL)
                    string = g_strdup_printf ("%s <%s>", organizer.cn, strip);
                else
                    string = g_strdup (strip);

                g_signal_handlers_block_by_func (gtk_bin_get_child (GTK_BIN (priv->organizer)), organizer_changed_cb, tpage);

                if (!priv->user_org) {
                    GtkComboBox *combo_box;
                    GtkListStore *list_store;
                    GtkTreeModel *model;
                    GtkTreeIter iter;

                    combo_box = GTK_COMBO_BOX (priv->organizer);
                    model = gtk_combo_box_get_model (combo_box);
                    list_store = GTK_LIST_STORE (model);

                    gtk_list_store_clear (list_store);
                    gtk_list_store_append (list_store, &iter);
                    gtk_list_store_set (list_store, &iter, 0, string, -1);
                    gtk_combo_box_set_active (combo_box, 0);
                    gtk_editable_set_editable (GTK_EDITABLE (gtk_bin_get_child (GTK_BIN (priv->organizer))), FALSE);
                } else {
                    gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->organizer))), string);
                }

                g_signal_handlers_unblock_by_func (gtk_bin_get_child (GTK_BIN (priv->organizer)), organizer_changed_cb, tpage);

                g_free (string);
                priv->existing = TRUE;
            }
        } else if (get_current_identity (tpage, &name, &mailto)) {
            EMeetingAttendee *attendee;
            gchar *backend_mailto = NULL;

            if (backend_addr != NULL && *backend_addr != '\0') {
                backend_mailto = g_strdup_printf (
                    "MAILTO:%s", backend_addr);
                if (g_ascii_strcasecmp (backend_mailto, mailto) == 0) {
                    g_free (backend_mailto);
                    backend_mailto = NULL;
                }
            }

            attendee =
                e_meeting_store_add_attendee_with_defaults (
                priv->meeting_store);
            priv->ia = g_object_ref (attendee);

            if (backend_mailto == NULL) {
                e_meeting_attendee_set_cn (attendee, name);
                e_meeting_attendee_set_address (attendee, mailto);
                name = mailto = NULL;
            } else {
                e_meeting_attendee_set_address (attendee, backend_mailto);
                e_meeting_attendee_set_sentby (attendee, mailto);
                backend_mailto = mailto = NULL;
            }

            if (client && e_cal_client_check_organizer_must_accept (client))
                e_meeting_attendee_set_status (
                    attendee, ICAL_PARTSTAT_NEEDSACTION);
            else
                e_meeting_attendee_set_status (
                    attendee, ICAL_PARTSTAT_ACCEPTED);

            e_meeting_list_view_add_attendee_to_name_selector (
                E_MEETING_LIST_VIEW (priv->list_view), attendee);

            g_free (backend_mailto);
        }

        g_free (mailto);
        g_free (name);
    }

    g_free (backend_addr);

    /* Percent Complete. */
    e_cal_component_get_percent (comp, &percent);
    if (percent) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), *percent);
    } else {
        /* FIXME: Could check if task is completed and set 100%. */
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 0);
    }

    /* Status. */
    e_cal_component_get_status (comp, &status);
    if (status == ICAL_STATUS_NONE || status == ICAL_STATUS_NEEDSACTION) {
        /* Try to use the percent value. */
        if (percent) {
            if (*percent == 100)
                status = ICAL_STATUS_COMPLETED;
            else if (*percent > 0)
                status = ICAL_STATUS_INPROCESS;
            else
                status = ICAL_STATUS_NONE;
        } else
            status = ICAL_STATUS_NONE;
    }
    e_dialog_combo_box_set (priv->status_combo, status, status_map);

    if (percent)
        e_cal_component_free_percent (percent);

    /* Completed Date. */
    e_cal_component_get_completed (comp, &completed);
    if (completed) {
        icaltimezone *utc_zone, *zone;

        /* Completed is in UTC, but that would confuse the user, so
         * we convert it to local time. */
        utc_zone = icaltimezone_get_utc_timezone ();
        zone = comp_editor_get_timezone (editor);

        icaltimezone_convert_time (completed, utc_zone, zone);

        e_date_edit_set_date (
            E_DATE_EDIT (priv->completed_date),
            completed->year, completed->month,
            completed->day);
        e_date_edit_set_time_of_day (
            E_DATE_EDIT (priv->completed_date),
            completed->hour,
            completed->minute);

        e_cal_component_free_icaltimetype (completed);
    }

    /* Priority. */
    e_cal_component_get_priority (comp, &priority_value);
    if (priority_value) {
        priority = priority_value_to_index (*priority_value);
        e_cal_component_free_priority (priority_value);
    } else {
        priority = PRIORITY_UNDEFINED;
    }
    e_dialog_combo_box_set (priv->priority_combo, priority, priority_map);

    /* URL */
    e_cal_component_get_url (comp, &url);
    gtk_entry_set_text (GTK_ENTRY (priv->web_page_entry), url ? url : "");

    sensitize_widgets (tpage);

    e_widget_undo_reset (priv->summary);
    e_widget_undo_reset (priv->categories);
    e_widget_undo_reset (priv->web_page_entry);
    e_widget_undo_reset (priv->description);

    return TRUE;
}

static gboolean
task_page_fill_component (CompEditorPage *page,
                          ECalComponent *comp)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    ECalComponentClassification classification;
    ECalComponentDateTime date;
    CompEditor *editor;
    CompEditorFlags flags;
    ECalClient *client;
    struct icaltimetype start_tt, due_tt;
    gchar *cat, *str;
    gboolean start_date_set, due_date_set;
    GtkTextBuffer *text_buffer;
    GtkTextIter text_iter_start, text_iter_end;
    struct icaltimetype icalcomplete, icaltoday;
    icalproperty_status status;
    TaskEditorPriority priority;
    gint priority_value, percent;
    const gchar *text;
    gboolean date_set;
    icaltimezone *zone;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;
    text_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description));

    editor = comp_editor_page_get_editor (page);
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);
    zone = comp_editor_get_timezone (editor);

    /* Summary. */

    str = gtk_editable_get_chars (GTK_EDITABLE (priv->summary), 0, -1);
    if (str == NULL || *str == '\0')
        e_cal_component_set_summary (comp, NULL);
    else {
        ECalComponentText text;

        text.value = str;
        text.altrep = NULL;

        e_cal_component_set_summary (comp, &text);
    }

    g_free (str);

    /* Description */

    gtk_text_buffer_get_start_iter (text_buffer, &text_iter_start);
    gtk_text_buffer_get_end_iter   (text_buffer, &text_iter_end);
    str = gtk_text_buffer_get_text (text_buffer, &text_iter_start, &text_iter_end, FALSE);

    if (!str || strlen (str) == 0)
        e_cal_component_set_description_list (comp, NULL);
    else {
        GSList l;
        ECalComponentText text;

        text.value = str;
        text.altrep = NULL;
        l.data = &text;
        l.next = NULL;

        e_cal_component_set_description_list (comp, &l);
    }

    g_free (str);

    /* Dates */

    due_tt = icaltime_null_time ();

    date.value = &due_tt;
    date.tzid = NULL;

    /* Due Date. */
    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->due_date))) {
        comp_editor_page_display_validation_error (page, _("Due date is wrong"), priv->due_date);
        return FALSE;
    }

    due_date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->due_date),
        &due_tt.year,
        &due_tt.month,
        &due_tt.day);
    if (due_date_set) {
        due_tt.is_date = TRUE;
        date.tzid = NULL;
        e_cal_component_set_due (comp, &date);
    } else {
        e_cal_component_set_due (comp, NULL);
    }

    /* Start Date. */
    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->start_date))) {
        comp_editor_page_display_validation_error (page, _("Start date is wrong"), priv->start_date);
        return FALSE;
    }

    start_tt = icaltime_null_time ();
    date.value = &start_tt;
    start_date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->start_date),
        &start_tt.year,
        &start_tt.month,
        &start_tt.day);
    if (start_date_set) {
        start_tt.is_date = TRUE;
        date.tzid = NULL;
        e_cal_component_set_dtstart (comp, &date);
    } else {
        e_cal_component_set_dtstart (comp, NULL);
    }

    /* Classification. */
    classification = comp_editor_get_classification (editor);
    e_cal_component_set_classification (comp, classification);

    /* send options */
    if (priv->sendoptions_shown && priv->sod) {
        icaltimezone *zone = comp_editor_get_timezone (editor);
        e_send_options_utils_fill_component (priv->sod, comp, zone);
    }

    /* Categories */
    cat = gtk_editable_get_chars (GTK_EDITABLE (priv->categories), 0, -1);
    str = comp_editor_strip_categories (cat);
    g_free (cat);

    e_cal_component_set_categories (comp, str);

    if (str)
        g_free (str);

    if (priv->is_assignment) {
        ECalComponentOrganizer organizer = {NULL, NULL, NULL, NULL};

        if (!priv->existing) {
            gchar *backend_addr = NULL;
            gchar *backend_mailto = NULL;
            gchar *name;
            gchar *mailto;

            e_client_get_backend_property_sync (E_CLIENT (client), CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS, &backend_addr, NULL, NULL);

            /* Find the identity for the organizer or sentby field */
            if (!get_current_identity (tpage, &name, &mailto)) {
                e_notice (
                    priv->main, GTK_MESSAGE_ERROR,
                    _("An organizer is required."));
                return FALSE;
            }

            /* Prefer the backend address if we have one. */
            if (backend_addr != NULL && *backend_addr != '\0') {
                backend_mailto = g_strdup_printf (
                    "MAILTO:%s", backend_addr);
                if (g_ascii_strcasecmp (backend_mailto, mailto) == 0) {
                    g_free (backend_mailto);
                    backend_mailto = NULL;
                }
            }

            if (backend_mailto == NULL) {
                organizer.cn = name;
                organizer.value = mailto;
                name = mailto = NULL;
            } else {
                organizer.value = backend_mailto;
                organizer.sentby = mailto;
                backend_mailto = mailto = NULL;
            }

            e_cal_component_set_organizer (comp, &organizer);

            g_free (backend_addr);
            g_free (backend_mailto);
            g_free (name);
            g_free (mailto);
        }

        if (e_meeting_store_count_actual_attendees (priv->meeting_store) < 1) {
            e_notice (
                priv->main, GTK_MESSAGE_ERROR,
                _("At least one attendee is required."));
            return FALSE;
        }

        if (flags & COMP_EDITOR_DELEGATE) {
            GSList *attendee_list, *l;
            gint i;
            const GPtrArray *attendees = e_meeting_store_get_attendees (priv->meeting_store);

            e_cal_component_get_attendee_list (priv->comp, &attendee_list);

            for (i = 0; i < attendees->len; i++) {
                EMeetingAttendee *ia = g_ptr_array_index (attendees, i);
                ECalComponentAttendee *ca;

                /* Remove the duplicate user from the component if present */
                if (e_meeting_attendee_is_set_delfrom (ia) || e_meeting_attendee_is_set_delto (ia)) {
                    for (l = attendee_list; l; l = l->next) {
                        ECalComponentAttendee *a = l->data;

                        if (g_str_equal (a->value, e_meeting_attendee_get_address (ia))) {
                            attendee_list = g_slist_remove (attendee_list, l->data);
                            break;
                        }
                    }
                }

                ca = e_meeting_attendee_as_e_cal_component_attendee (ia);

                attendee_list = g_slist_append (attendee_list, ca);
            }
            e_cal_component_set_attendee_list (comp, attendee_list);
            e_cal_component_free_attendee_list (attendee_list);
        } else
            set_attendees (comp, e_meeting_store_get_attendees (priv->meeting_store));
    }

    /* Percent Complete. */
    percent = gtk_spin_button_get_value_as_int (
        GTK_SPIN_BUTTON (priv->percent_complete));
    e_cal_component_set_percent (comp, &percent);

    /* Status. */
    status = e_dialog_combo_box_get (priv->status_combo, status_map);
    e_cal_component_set_status (comp, status);

    /* Priority. */
    priority = e_dialog_combo_box_get (priv->priority_combo, priority_map);
    priority_value = priority_index_to_value (priority);
    e_cal_component_set_priority (comp, &priority_value);

    icalcomplete = icaltime_null_time ();

    /* COMPLETED must be in UTC. */
    icalcomplete.is_utc = 1;

    /* Completed Date. */
    if (!e_date_edit_date_is_valid (E_DATE_EDIT (priv->completed_date)) ||
        !e_date_edit_time_is_valid (E_DATE_EDIT (priv->completed_date))) {
        comp_editor_page_display_validation_error (
            page, _("Completed date is wrong"),
            priv->completed_date);
        return FALSE;
    }

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->completed_date),
        &icalcomplete.year,
        &icalcomplete.month,
        &icalcomplete.day);

    if (date_set) {
        e_date_edit_get_time_of_day (
            E_DATE_EDIT (priv->completed_date),
            &icalcomplete.hour,
            &icalcomplete.minute);

        /* COMPLETED today or before */
        icaltoday = icaltime_current_time_with_zone (zone);
        icaltimezone_convert_time (
            &icaltoday, zone,
            icaltimezone_get_utc_timezone ());

        if (icaltime_compare_date_only (icalcomplete, icaltoday) > 0) {
            comp_editor_page_display_validation_error (
                page, _("Completed date is wrong"),
                priv->completed_date);
            return FALSE;
        }

        /* COMPLETED must be in UTC, so we assume that the date in the
         * dialog is in the current timezone, and we now convert it
         * to UTC. FIXME: We should really use one timezone for the
         * entire time the dialog is shown. Otherwise if the user
         * changes the timezone, the COMPLETED date may get changed
         * as well. */
        icaltimezone_convert_time (
            &icalcomplete, zone,
                icaltimezone_get_utc_timezone ());
        e_cal_component_set_completed (comp, &icalcomplete);
    } else {
        e_cal_component_set_completed (comp, NULL);
    }

    /* URL. */
    text = gtk_entry_get_text (GTK_ENTRY (priv->web_page_entry));
    e_cal_component_set_url (comp, text);

    return TRUE;
}

static gboolean
task_page_fill_timezones (CompEditorPage *page,
                          GHashTable *timezones)
{
    TaskPage *tpage;
    TaskPagePrivate *priv;
    icaltimezone *zone;

    tpage = TASK_PAGE (page);
    priv = tpage->priv;

    /* add start date timezone */
    zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));
    if (zone) {
        if (!g_hash_table_lookup (timezones, icaltimezone_get_tzid (zone)))
            g_hash_table_insert (timezones, (gpointer) icaltimezone_get_tzid (zone), zone);
    }

    /* Add UTC timezone, which is the one
     * used for the DATE-COMPLETED property. */
    zone = icaltimezone_get_utc_timezone ();
    if (zone != NULL) {
        gconstpointer tzid = icaltimezone_get_tzid (zone);

        if (!g_hash_table_lookup (timezones, tzid))
            g_hash_table_insert (timezones, (gpointer) tzid, zone);
    }

    return TRUE;
}

static void
task_page_add_attendee (CompEditorPage *page,
                        EMeetingAttendee *attendee)
{
    CompEditor *editor;
    TaskPagePrivate *priv;

    priv = TASK_PAGE_GET_PRIVATE (page);
    editor = comp_editor_page_get_editor (page);

    if ((comp_editor_get_flags (editor) & COMP_EDITOR_DELEGATE) != 0) {
        gchar *delfrom;

        /* EMeetingAttendee takes ownership of the string. */
        delfrom = g_strdup_printf ("MAILTO:%s", priv->user_add);
        e_meeting_attendee_set_delfrom (attendee, delfrom);
    }

    e_meeting_store_add_attendee (priv->meeting_store, attendee);
    e_meeting_list_view_add_attendee_to_name_selector (
        E_MEETING_LIST_VIEW (priv->list_view), attendee);
}

static void
task_page_class_init (TaskPageClass *class)
{
    GObjectClass *object_class;
    CompEditorPageClass *editor_page_class;

    g_type_class_add_private (class, sizeof (TaskPagePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = task_page_dispose;
    object_class->finalize = task_page_finalize;

    editor_page_class = COMP_EDITOR_PAGE_CLASS (class);
    editor_page_class->get_widget = task_page_get_widget;
    editor_page_class->focus_main_widget = task_page_focus_main_widget;
    editor_page_class->fill_widgets = task_page_fill_widgets;
    editor_page_class->fill_component = task_page_fill_component;
    editor_page_class->fill_timezones = task_page_fill_timezones;
    editor_page_class->add_attendee = task_page_add_attendee;
}

static void
task_page_init (TaskPage *tpage)
{
    tpage->priv = TASK_PAGE_GET_PRIVATE (tpage);
    tpage->priv->deleted_attendees = g_ptr_array_new ();
}

void
task_page_set_view_role (TaskPage *page,
                         gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, E_MEETING_STORE_ROLE_COL, state);
}

void
task_page_set_view_status (TaskPage *page,
                           gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, E_MEETING_STORE_STATUS_COL, state);
}

void
task_page_set_view_type (TaskPage *page,
                         gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, E_MEETING_STORE_TYPE_COL, state);
}

void
task_page_set_view_rsvp (TaskPage *page,
                         gboolean state)
{
    TaskPagePrivate *priv = page->priv;

    e_meeting_list_view_column_set_visible (priv->list_view, E_MEETING_STORE_RSVP_COL, state);
}

void
task_page_hide_options (TaskPage *page)
{
    CompEditor *editor;
    GtkAction *action;

    g_return_if_fail (IS_TASK_PAGE (page));

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_visible (action, FALSE);
}

void
task_page_show_options (TaskPage *page)
{
    CompEditor *editor;
    GtkAction *action;

    g_return_if_fail (IS_TASK_PAGE (page));

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    action = comp_editor_get_action (editor, "send-options");
    gtk_action_set_visible (action, TRUE);
}

void
task_page_set_assignment (TaskPage *page,
                          gboolean set)
{
    g_return_if_fail (IS_TASK_PAGE (page));

    page->priv->is_assignment = set;
    sensitize_widgets (page);
}

static void
add_clicked_cb (GtkButton *btn,
                TaskPage *page)
{
    EMeetingAttendee *attendee;
    CompEditor *editor;
    CompEditorFlags flags;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

    attendee = e_meeting_store_add_attendee_with_defaults (page->priv->meeting_store);

    if (flags & COMP_EDITOR_DELEGATE) {
        e_meeting_attendee_set_delfrom (attendee, g_strdup_printf ("MAILTO:%s", page->priv->user_add));
    }

    e_meeting_list_view_edit (page->priv->list_view, attendee);
}

static void edit_clicked_cb (GtkButton *btn, TaskPage *tpage)
{
    TaskPagePrivate *priv;
    GtkTreePath *path = NULL;
    GtkTreeViewColumn *focus_col;

    priv = tpage->priv;

    gtk_tree_view_get_cursor (GTK_TREE_VIEW (priv->list_view), &path, NULL);
    g_return_if_fail (path != NULL);

    gtk_tree_view_get_cursor (GTK_TREE_VIEW (priv->list_view), &path, &focus_col);
    gtk_tree_view_set_cursor (GTK_TREE_VIEW (priv->list_view), path, focus_col, TRUE);
    gtk_tree_path_free (path);
}

static gboolean
existing_attendee (EMeetingAttendee *ia,
                   ECalComponent *comp)
{
    GSList *attendees, *l;
    const gchar *ia_address;
    const gchar *ia_sentby = NULL;

    ia_address = itip_strip_mailto (e_meeting_attendee_get_address (ia));
    if (!ia_address)
        return FALSE;

    if (e_meeting_attendee_is_set_sentby (ia))
        ia_sentby = itip_strip_mailto (e_meeting_attendee_get_sentby (ia));

    e_cal_component_get_attendee_list (comp, &attendees);

    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *attendee = l->data;
        const gchar *address;
        const gchar *sentby = NULL;

        address = itip_strip_mailto (attendee->value);
        if (attendee->sentby)
            sentby = itip_strip_mailto (attendee->sentby);

        if ((address && !g_ascii_strcasecmp (ia_address, address)) || (sentby && ia_sentby && !g_ascii_strcasecmp (ia_sentby, sentby))) {
            e_cal_component_free_attendee_list (attendees);
            return TRUE;
        }
    }

    e_cal_component_free_attendee_list (attendees);

    return FALSE;
}

static void
remove_attendee (TaskPage *page,
                 EMeetingAttendee *ia)
{
    TaskPagePrivate *priv = page->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    gint pos = 0;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

    /* If the user deletes the organizer attendee explicitly,
     * assume they no longer want the organizer showing up */
    if (ia == priv->ia) {
        g_object_unref (priv->ia);
        priv->ia = NULL;
    }

    /* If this was a delegatee, no longer delegate */
    if (e_meeting_attendee_is_set_delfrom (ia)) {
        EMeetingAttendee *ib;

        ib = e_meeting_store_find_attendee (priv->meeting_store, e_meeting_attendee_get_delfrom (ia), &pos);
        if (ib != NULL) {
            e_meeting_attendee_set_delto (ib, NULL);

            if (!(flags & COMP_EDITOR_DELEGATE))
                e_meeting_attendee_set_edit_level (ib,  E_MEETING_ATTENDEE_EDIT_FULL);
        }
    }

    /* Handle deleting all attendees in the delegation chain */
    while (ia != NULL) {
        EMeetingAttendee *ib = NULL;

        if (existing_attendee (ia, priv->comp) && !comp_editor_have_in_new_attendees (priv->comp, ia)) {
            g_object_ref (ia);
            g_ptr_array_add (priv->deleted_attendees, ia);
        }

        if (e_meeting_attendee_get_delto (ia) != NULL)
            ib = e_meeting_store_find_attendee (priv->meeting_store, e_meeting_attendee_get_delto (ia), NULL);

        comp_editor_manage_new_attendees (priv->comp, ia, FALSE);
        e_meeting_list_view_remove_attendee_from_name_selector (priv->list_view, ia);
        e_meeting_store_remove_attendee (priv->meeting_store, ia);

        ia = ib;
    }

    sensitize_widgets (page);
}

static void
remove_clicked_cb (GtkButton *btn,
                   TaskPage *page)
{
    TaskPagePrivate *priv;
    EMeetingAttendee *ia;
    GtkTreeSelection *selection;
    GList *paths = NULL, *tmp;
    GtkTreeIter iter;
    GtkTreePath *path = NULL;
    GtkTreeModel *model = NULL;
    gboolean valid_iter;
    gchar *address;

    priv = page->priv;

    selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (priv->list_view));
    model = GTK_TREE_MODEL (priv->meeting_store);
    if (!(paths = gtk_tree_selection_get_selected_rows (selection, &model))) {
        g_warning ("Could not get a selection to delete.");
        return;
    }
    paths = g_list_reverse (paths);

    for (tmp = paths; tmp; tmp = tmp->next) {
        path = tmp->data;

        gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->meeting_store), &iter, path);

        gtk_tree_model_get (GTK_TREE_MODEL (priv->meeting_store), &iter, E_MEETING_STORE_ADDRESS_COL, &address, -1);
        ia = e_meeting_store_find_attendee (priv->meeting_store, address, NULL);
        g_free (address);
        if (!ia) {
            g_warning ("Cannot delete attendee\n");
            continue;
        } else if (e_meeting_attendee_get_edit_level (ia) != E_MEETING_ATTENDEE_EDIT_FULL) {
            g_warning ("Not enough rights to delete attendee: %s\n", e_meeting_attendee_get_address (ia));
            continue;
        }

        remove_attendee (page, ia);
    }

    /* Select closest item after removal */
    valid_iter = gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->meeting_store), &iter, path);
    if (!valid_iter) {
        gtk_tree_path_prev (path);
        valid_iter = gtk_tree_model_get_iter (GTK_TREE_MODEL (priv->meeting_store), &iter, path);
    }

    if (valid_iter) {
        gtk_tree_selection_unselect_all (selection);
        gtk_tree_selection_select_iter (selection, &iter);
    }

    g_list_foreach (paths, (GFunc) gtk_tree_path_free, NULL);
    g_list_free (paths);
}

static void
invite_cb (GtkWidget *widget,
           TaskPage *page)
{
    e_meeting_list_view_invite_others_dialog (page->priv->list_view);
}

static void
attendee_added_cb (EMeetingListView *emlv,
                   EMeetingAttendee *ia,
                   TaskPage *page)
{
    TaskPagePrivate *priv = page->priv;
    CompEditor *editor;
    CompEditorFlags flags;
    ECalClient *client;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    client = comp_editor_get_client (editor);
    flags = comp_editor_get_flags (editor);

    if (!(flags & COMP_EDITOR_DELEGATE)) {
        comp_editor_manage_new_attendees (priv->comp, ia, TRUE);
        return;
    }

    /* do not remove here, it did EMeetingListView already */
    e_meeting_attendee_set_delfrom (ia, g_strdup_printf ("MAILTO:%s", priv->user_add ? priv->user_add : ""));

    if (!e_client_check_capability (E_CLIENT (client), CAL_STATIC_CAPABILITY_DELEGATE_TO_MANY)) {
        EMeetingAttendee *delegator;

        gtk_widget_set_sensitive (priv->invite, FALSE);
        gtk_widget_set_sensitive (priv->add, FALSE);
        gtk_widget_set_sensitive (priv->edit, FALSE);

        delegator = e_meeting_store_find_attendee (priv->meeting_store, priv->user_add, NULL);
        g_return_if_fail (delegator != NULL);

        e_meeting_attendee_set_delto (delegator, g_strdup (e_meeting_attendee_get_address (ia)));
    }
}

static gboolean
list_view_event (EMeetingListView *list_view,
                 GdkEvent *event,
                 TaskPage *page)
{
    TaskPagePrivate *priv= page->priv;
    CompEditor *editor;
    CompEditorFlags flags;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (page));
    flags = comp_editor_get_flags (editor);

    if (event->type == GDK_2BUTTON_PRESS && flags & COMP_EDITOR_USER_ORG) {
        EMeetingAttendee *attendee;

        attendee = e_meeting_store_add_attendee_with_defaults (priv->meeting_store);

        if (flags & COMP_EDITOR_DELEGATE) {
            e_meeting_attendee_set_delfrom (attendee, g_strdup_printf ("MAILTO:%s", page->priv->user_add));
        }

        e_meeting_list_view_edit (page->priv->list_view, attendee);
        return TRUE;
    }

    return FALSE;
}

static gboolean
list_key_press (EMeetingListView *list_view,
                GdkEventKey *event,
                TaskPage *page)
{
    if (event->keyval == GDK_KEY_Delete) {

        remove_clicked_cb (NULL, page);

        return TRUE;
    } else if (event->keyval == GDK_KEY_Insert) {
        add_clicked_cb (NULL, page);

        return TRUE;
    }

    return FALSE;
}

void
task_page_set_show_timezone (TaskPage *page,
                             gboolean state)
{
    if (state) {
        gtk_widget_show_all (page->priv->timezone);
        gtk_widget_show (page->priv->timezone_label);
    } else {
        gtk_widget_hide (page->priv->timezone);
        gtk_widget_hide (page->priv->timezone_label);
    }

}

void
task_page_set_show_categories (TaskPage *page,
                               gboolean state)
{
    if (state) {
        gtk_widget_show (page->priv->categories_btn);
        gtk_widget_show (page->priv->categories);
    } else {
        gtk_widget_hide (page->priv->categories_btn);
        gtk_widget_hide (page->priv->categories);
    }
}

/*If the msg has some value set, the icon should always be set */
void
task_page_set_info_string (TaskPage *tpage,
                           const gchar *icon,
                           const gchar *msg)
{
    TaskPagePrivate *priv;

    priv = tpage->priv;

    gtk_image_set_from_icon_name (GTK_IMAGE (priv->info_icon), icon, GTK_ICON_SIZE_BUTTON);
    gtk_label_set_markup (GTK_LABEL (priv->info_string), msg);

    if (msg && icon)
        gtk_widget_show (priv->info_hbox);
    else
        gtk_widget_hide (priv->info_hbox);
}

/* Gets the widgets from the XML file and returns if they are all available. */
static gboolean
get_widgets (TaskPage *tpage)
{
    EShell *shell;
    EClientCache *client_cache;
    CompEditor *editor;
    CompEditorPage *page = COMP_EDITOR_PAGE (tpage);
    GtkEntryCompletion *completion;
    TaskPagePrivate *priv;
    GSList *accel_groups;
    GtkWidget *toplevel;
    GtkWidget *parent;
    GtkWidget *sw;
    GtkTreeSelection *selection;

    priv = tpage->priv;

    editor = comp_editor_page_get_editor (page);
    shell = comp_editor_get_shell (editor);
    client_cache = e_shell_get_client_cache (shell);

    priv->main = e_builder_get_widget (priv->builder, "task-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 (G_OBJECT (toplevel));
    if (accel_groups)
        page->accel_group = g_object_ref (accel_groups->data);

    g_object_ref (priv->main);
    parent = gtk_widget_get_parent (priv->main);
    gtk_container_remove (GTK_CONTAINER (parent), priv->main);

    priv->info_hbox = e_builder_get_widget (priv->builder, "generic-info");
    priv->info_icon = e_builder_get_widget (priv->builder, "generic-info-image");
    priv->info_string = e_builder_get_widget (priv->builder, "generic-info-msgs");

    priv->summary = e_builder_get_widget (priv->builder, "summary");
    priv->summary_label = e_builder_get_widget (priv->builder, "summary-label");

    /* Glade's visibility flag doesn't seem to work for custom widgets */
    priv->due_date = e_builder_get_widget (priv->builder, "due-date");
    gtk_widget_show (priv->due_date);
    priv->start_date = e_builder_get_widget (priv->builder, "start-date");
    gtk_widget_show (priv->start_date);

    priv->completed_date = e_builder_get_widget (priv->builder, "completed-date");
    priv->status_combo = e_builder_get_widget (priv->builder, "status-combobox");
    priv->priority_combo = e_builder_get_widget (priv->builder, "priority-combobox");
    priv->percent_complete = e_builder_get_widget (priv->builder, "percent-complete");
    priv->classification_combo = e_builder_get_widget (priv->builder, "classification-combobox");
    priv->web_page_entry = e_builder_get_widget (priv->builder, "web-page-entry");

    priv->timezone = e_builder_get_widget (priv->builder, "timezone");
    priv->timezone_label = e_builder_get_widget (priv->builder, "timezone-label");
    priv->description = e_builder_get_widget (priv->builder, "description");
    priv->categories_btn = e_builder_get_widget (priv->builder, "categories-button");
    priv->categories = e_builder_get_widget (priv->builder, "categories");

    priv->organizer = e_builder_get_widget (priv->builder, "organizer");
    gtk_list_store_clear (GTK_LIST_STORE (gtk_combo_box_get_model (GTK_COMBO_BOX (priv->organizer))));
    gtk_combo_box_set_entry_text_column (GTK_COMBO_BOX (priv->organizer), 0);

    priv->invite = e_builder_get_widget (priv->builder, "invite");
    priv->add = e_builder_get_widget (priv->builder, "add-attendee");
    priv->edit = e_builder_get_widget (priv->builder, "edit-attendee");
    priv->remove = e_builder_get_widget (priv->builder, "remove-attendee");
    priv->list_box = e_builder_get_widget (priv->builder, "list-box");
    priv->calendar_label = e_builder_get_widget (priv->builder, "group-label");
    priv->attendee_box = e_builder_get_widget (priv->builder, "attendee-box");
    priv->org_cal_label = e_builder_get_widget (priv->builder, "org-task-label");

    priv->list_view = e_meeting_list_view_new (priv->meeting_store);

    selection = gtk_tree_view_get_selection ((GtkTreeView *) priv->list_view);
    gtk_tree_selection_set_mode (selection, GTK_SELECTION_MULTIPLE);
    gtk_widget_show (GTK_WIDGET (priv->list_view));

    sw = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (sw), GTK_SHADOW_IN);
    gtk_widget_show (sw);
    gtk_container_add (GTK_CONTAINER (sw), GTK_WIDGET (priv->list_view));
    gtk_box_pack_start (GTK_BOX (priv->list_box), sw, TRUE, TRUE, 0);

    priv->client_combo_box = e_builder_get_widget (
        priv->builder, "client-combo-box");
    e_client_combo_box_set_client_cache (
        E_CLIENT_COMBO_BOX (priv->client_combo_box), client_cache);

    gtk_label_set_mnemonic_widget (GTK_LABEL (priv->calendar_label), priv->client_combo_box);

    completion = e_category_completion_new ();
    gtk_entry_set_completion (GTK_ENTRY (priv->categories), completion);
    g_object_unref (completion);

    return (priv->summary
        && priv->summary_label
        && priv->due_date
        && priv->start_date
        && priv->timezone
        && priv->description
        && priv->categories_btn
        && priv->categories
        && priv->organizer
        && priv->completed_date
        && priv->status_combo
        && priv->priority_combo
        && priv->percent_complete
        && priv->classification_combo
        && priv->web_page_entry
        );
}

static void
summary_changed_cb (GtkEntry *entry,
                    CompEditorPage *page)
{
    CompEditor *editor;
    const gchar *text;

    if (comp_editor_page_get_updating (page))
        return;

    editor = comp_editor_page_get_editor (page);
    text = gtk_entry_get_text (entry);
    comp_editor_set_summary (editor, text);
}

/* Callback used when the start or due date widgets change.  We notify the
 * other pages in the task editor, so they can update any labels.
 */
static void
date_changed_cb (EDateEdit *dedit,
                 TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditorPageDates dates;
    gboolean date_set;
    ECalComponentDateTime start_dt, due_dt;
    struct icaltimetype start_tt = icaltime_null_time ();
    struct icaltimetype due_tt = icaltime_null_time ();

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->start_date),
        &start_tt.year,
        &start_tt.month,
        &start_tt.day);
    if (date_set) {
        start_tt.is_date = TRUE;
        start_dt.tzid = NULL;
    } else {
        start_tt = icaltime_null_time ();
        start_dt.tzid = NULL;
    }

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->due_date),
        &due_tt.year,
        &due_tt.month,
        &due_tt.day);
    if (date_set) {
        due_tt.is_date = TRUE;
        due_dt.tzid = NULL;
    } else {
        due_tt = icaltime_null_time ();
        due_dt.tzid = NULL;
    }

    start_dt.value = &start_tt;
    dates.start = &start_dt;
    dates.end = NULL;
    due_dt.value = &due_tt;
    dates.due = &due_dt;
    dates.complete = NULL;

    /* Notify upstream */
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tpage),
                           &dates);

    check_starts_in_the_past (tpage);
}

static void
timezone_changed_cb (EDateEdit *dedit,
                     TaskPage *tpage)
{
    date_changed_cb ((EDateEdit *) tpage->priv->start_date, tpage);
    date_changed_cb ((EDateEdit *) tpage->priv->due_date, tpage);
}

/* Callback used when the categories button is clicked; we must bring up the
 * category list dialog.
 */
static void
categories_clicked_cb (GtkWidget *button,
                       TaskPage *tpage)
{
    GtkEntry *entry;

    entry = GTK_ENTRY (tpage->priv->categories);
    e_categories_config_open_dialog_for_entry (entry);
}

static gboolean
check_start_before_end (struct icaltimetype *start_tt,
                        icaltimezone *start_zone,
                        struct icaltimetype *end_tt,
                        icaltimezone *end_zone,
                        gboolean adjust_end_time,
                        gboolean adjust_by_hour)
{
    struct icaltimetype end_tt_copy;
    gint cmp;

    /* Convert the end time to the same timezone as the start time. */
    end_tt_copy = *end_tt;
    icaltimezone_convert_time (&end_tt_copy, end_zone, start_zone);

    /* Now check if the start time is after the end time. If it is,
     * we need to modify one of the times. */
    cmp = icaltime_compare (*start_tt, end_tt_copy);
    if (cmp > 0) {
        if (adjust_end_time) {
            /* Modify the end time, to be the start + 1 hour/day. */
            *end_tt = *start_tt;
            icaltime_adjust (end_tt, 0, adjust_by_hour ? 1 : 24, 0, 0);
            icaltimezone_convert_time (
                end_tt, start_zone,
                end_zone);
        } else {
            /* Modify the start time, to be the end - 1 hour/day. */
            *start_tt = *end_tt;
            icaltime_adjust (start_tt, 0, adjust_by_hour ? -1 : -24, 0, 0);
            icaltimezone_convert_time (
                start_tt, end_zone,
                start_zone);
        }
        return TRUE;
    }

    return FALSE;
}

/*
 * This is called whenever the start or due dates.
 * It makes sure that the start date < end date. It also emits the notification
 * signals so the other event editor pages update their labels etc.
 *
 * If adjust_end_time is TRUE, if the start time < end time it will adjust
 * the end time. If FALSE it will adjust the start time. If the user sets the
 * start or end time, the other time is adjusted to make it valid.
 *
 * Time part of the value is changed only when both edits have time set,
 * otherwise times will differ one hour.
 */
static void
times_updated (TaskPage *tpage,
               gboolean adjust_end_time)
{
    TaskPagePrivate *priv;
    struct icaltimetype start_tt = icaltime_null_time ();
    struct icaltimetype end_tt = icaltime_null_time ();
    gboolean date_set;
    gboolean set_start_date = FALSE, set_end_date = FALSE;
    icaltimezone *zone;

    priv = tpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->start_date),
        &start_tt.year,
        &start_tt.month,
        &start_tt.day);
    if (!date_set)
        return;

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->due_date),
        &end_tt.year,
        &end_tt.month,
        &end_tt.day);
    if (!date_set)
        return;

    zone = e_timezone_entry_get_timezone (E_TIMEZONE_ENTRY (priv->timezone));

    if (check_start_before_end (&start_tt, zone,
                    &end_tt, zone,
                    adjust_end_time,
                    FALSE)) {
        if (adjust_end_time)
            set_end_date = TRUE;
        else
            set_start_date = TRUE;
    }

    if (set_start_date) {
        g_signal_handlers_block_matched (priv->start_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
        e_date_edit_set_date (E_DATE_EDIT (priv->start_date), start_tt.year, start_tt.month, start_tt.day);
        g_signal_handlers_unblock_matched (priv->start_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
    }

    if (set_end_date) {
        g_signal_handlers_block_matched (priv->due_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
        e_date_edit_set_date (E_DATE_EDIT (priv->due_date), end_tt.year, end_tt.month, end_tt.day);
        g_signal_handlers_unblock_matched (priv->due_date, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, tpage);
    }

    /* Notify upstream */
    date_changed_cb ((EDateEdit *) priv->start_date, tpage);
    date_changed_cb ((EDateEdit *) priv->due_date, tpage);
}

static void
start_date_changed_cb (TaskPage *tpage)
{
    times_updated (tpage, TRUE);
}

static void
due_date_changed_cb (TaskPage *tpage)
{
    times_updated (tpage, FALSE);
}

static void
tpage_get_client_cb (GObject *source_object,
                     GAsyncResult *result,
                     gpointer user_data)
{
    EClient *client;
    EClientComboBox *combo_box;
    TaskPage *tpage = user_data;
    TaskPagePrivate *priv;
    CompEditor *editor;
    GError *error = NULL;

    combo_box = E_CLIENT_COMBO_BOX (source_object);

    client = e_client_combo_box_get_client_finish (
        combo_box, result, &error);

    /* Sanity check. */
    g_return_if_fail (
        ((client != NULL) && (error == NULL)) ||
        ((client == NULL) && (error != NULL)));

    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_clear_error (&error);
        return;
    }

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    priv = tpage->priv;

    if (error != NULL) {
        GtkWidget *dialog;
        ECalClient *old_client;

        old_client = comp_editor_get_client (editor);

        e_source_combo_box_set_active (
            E_SOURCE_COMBO_BOX (combo_box),
            e_client_get_source (E_CLIENT (old_client)));

        dialog = gtk_message_dialog_new (
            NULL, GTK_DIALOG_MODAL,
            GTK_MESSAGE_WARNING, GTK_BUTTONS_OK,
            "%s", error->message);
        gtk_dialog_run (GTK_DIALOG (dialog));
        gtk_widget_destroy (dialog);

        g_clear_error (&error);
    } else {
        icaltimezone *zone;
        ECalClient *cal_client = E_CAL_CLIENT (client);

        g_return_if_fail (cal_client != NULL);

        zone = comp_editor_get_timezone (editor);
        e_cal_client_set_default_timezone (cal_client, zone);

        comp_editor_set_client (editor, cal_client);
        comp_editor_page_changed (COMP_EDITOR_PAGE (tpage));
        if (e_client_check_capability (client, CAL_STATIC_CAPABILITY_REQ_SEND_OPTIONS) && priv->is_assignment)
            task_page_show_options (tpage);
        else
            task_page_hide_options (tpage);

        if (client) {
            gchar *backend_addr = NULL;

            e_client_get_backend_property_sync (client, CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS, &backend_addr, NULL, NULL);

            if (priv->is_assignment)
                task_page_select_organizer (tpage, backend_addr);

            set_subscriber_info_string (tpage, backend_addr);
            g_free (backend_addr);
        }

        sensitize_widgets (tpage);
    }
}

static void
source_changed_cb (ESourceComboBox *combo_box,
                   TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    ESource *source;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    source = e_source_combo_box_ref_active (combo_box);
    g_return_if_fail (source != NULL);

    if (priv->connect_cancellable != NULL) {
        g_cancellable_cancel (priv->connect_cancellable);
        g_object_unref (priv->connect_cancellable);
    }
    priv->connect_cancellable = g_cancellable_new ();

    e_client_combo_box_get_client (
        E_CLIENT_COMBO_BOX (combo_box),
        source, priv->connect_cancellable,
        tpage_get_client_cb, tpage);

    g_object_unref (source);
}

static void
set_subscriber_info_string (TaskPage *tpage,
                            const gchar *backend_address)
{
    if (!check_starts_in_the_past (tpage))
        task_page_set_info_string (tpage, NULL, NULL);
}

void
task_page_send_options_clicked_cb (TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditor *editor;
    GtkWidget *toplevel;
    ESource *source;
    ECalClient *client;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    client = comp_editor_get_client (editor);

    if (!priv->sod) {
        priv->sod = e_send_options_dialog_new ();
        priv->sod->data->initialized = TRUE;
        source = e_source_combo_box_ref_active (
            E_SOURCE_COMBO_BOX (priv->client_combo_box));
        e_send_options_utils_set_default_data (
            priv->sod, source, "task");
        g_object_unref (source);
    }

    if (e_client_check_capability (E_CLIENT (client), CAL_STATIC_CAPABILITY_NO_GEN_OPTIONS)) {
        e_send_options_set_need_general_options (priv->sod, FALSE);
    }

    toplevel = gtk_widget_get_toplevel (priv->main);
    e_send_options_dialog_run (priv->sod, toplevel, E_ITEM_TASK);
}

static void
complete_date_changed (TaskPage *tpage,
                       time_t ctime,
                       gboolean complete)
{
    CompEditorPageDates dates = {NULL, NULL, NULL, NULL};
    icaltimezone *zone;
    struct icaltimetype completed_tt = icaltime_null_time ();

    /* Get the current time in UTC. */
    zone = icaltimezone_get_utc_timezone ();
    completed_tt = icaltime_from_timet_with_zone (ctime, FALSE, zone);
    completed_tt.is_utc = TRUE;

    dates.start = NULL;
    dates.end = NULL;
    dates.due = NULL;
    if (complete)
        dates.complete = &completed_tt;

    /* Notify upstream */
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tpage),
                           &dates);
}

static void
completed_date_changed_cb (EDateEdit *dedit,
                           TaskPage *tpage)
{
    TaskPagePrivate *priv = tpage->priv;
    CompEditorPageDates dates = {NULL, NULL, NULL, NULL};
    struct icaltimetype completed_tt = icaltime_null_time ();
    icalproperty_status status;
    gboolean date_set;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), TRUE);

    date_set = e_date_edit_get_date (
        E_DATE_EDIT (priv->completed_date),
        &completed_tt.year,
        &completed_tt.month,
        &completed_tt.day);
    e_date_edit_get_time_of_day (
        E_DATE_EDIT (priv->completed_date),
        &completed_tt.hour,
        &completed_tt.minute);

    status = e_dialog_combo_box_get (priv->status_combo, status_map);

    if (!date_set) {
        completed_tt = icaltime_null_time ();
        if (status == ICAL_STATUS_COMPLETED) {
            e_dialog_combo_box_set (
                priv->status_combo,
                ICAL_STATUS_NONE,
                status_map);
            gtk_spin_button_set_value (
                GTK_SPIN_BUTTON (priv->percent_complete), 0);
        }
    } else {
        if (status != ICAL_STATUS_COMPLETED) {
            e_dialog_combo_box_set (
                priv->status_combo,
                ICAL_STATUS_COMPLETED,
                status_map);
        }
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 100);
    }

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), FALSE);

    /* Notify upstream */
    dates.complete = &completed_tt;
    comp_editor_page_notify_dates_changed (COMP_EDITOR_PAGE (tpage), &dates);
}

static void
status_changed (GtkWidget *combo,
                TaskPage *tpage)
{
    TaskPagePrivate *priv;
    icalproperty_status status;
    CompEditor *editor;
    time_t ctime = -1;

    priv = tpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), TRUE);

    status = e_dialog_combo_box_get (priv->status_combo, status_map);
    if (status == ICAL_STATUS_NONE) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 0);
        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tpage, 0, FALSE);
    } else if (status == ICAL_STATUS_INPROCESS) {
        gint percent_complete = gtk_spin_button_get_value_as_int (
            GTK_SPIN_BUTTON (priv->percent_complete));
        if (percent_complete <= 0 || percent_complete >= 100)
            gtk_spin_button_set_value (
                GTK_SPIN_BUTTON (priv->percent_complete), 50);

        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tpage, 0, FALSE);
    } else if (status == ICAL_STATUS_COMPLETED) {
        gtk_spin_button_set_value (
            GTK_SPIN_BUTTON (priv->percent_complete), 100);
        ctime = time (NULL);
        e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
        complete_date_changed (tpage, ctime, TRUE);
    }

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), FALSE);

    comp_editor_set_changed (editor, TRUE);
}

static void
percent_complete_changed (GtkAdjustment *adj,
                          TaskPage *tpage)
{
    TaskPagePrivate *priv;
    gint percent;
    icalproperty_status status;
    CompEditor *editor;
    gboolean complete;
    time_t ctime = -1;

    priv = tpage->priv;

    if (comp_editor_page_get_updating (COMP_EDITOR_PAGE (tpage)))
        return;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), TRUE);

    percent = gtk_spin_button_get_value_as_int (
        GTK_SPIN_BUTTON (priv->percent_complete));
    if (percent == 100) {
        complete = TRUE;
        ctime = time (NULL);
        status = ICAL_STATUS_COMPLETED;
    } else {
        complete = FALSE;

        if (percent == 0)
            status = ICAL_STATUS_NONE;
        else
            status = ICAL_STATUS_INPROCESS;
    }

    e_dialog_combo_box_set (priv->status_combo, status, status_map);
    e_date_edit_set_time (E_DATE_EDIT (priv->completed_date), ctime);
    complete_date_changed (tpage, ctime, complete);

    comp_editor_page_set_updating (COMP_EDITOR_PAGE (tpage), FALSE);

    comp_editor_set_changed (editor, TRUE);
}

static gboolean
task_page_transform_classification_to_combo (GBinding *binding,
                                             const GValue *source_value,
                                             GValue *target_value,
                                             gpointer user_data)
{
    gint action_value;

    g_return_val_if_fail (source_value != NULL, FALSE);
    g_return_val_if_fail (target_value != NULL, FALSE);

    action_value = g_value_get_int (source_value);
    g_value_set_int (target_value, action_value - 1);

    return TRUE;
}

static gboolean
task_page_transform_classification_from_combo (GBinding *binding,
                                               const GValue *source_value,
                                               GValue *target_value,
                                               gpointer user_data)
{
    gint combo_value;

    g_return_val_if_fail (source_value != NULL, FALSE);
    g_return_val_if_fail (target_value != NULL, FALSE);

    combo_value = g_value_get_int (source_value);
    g_value_set_int (target_value, combo_value + 1);

    return TRUE;
}

/* Hooks the widget signals */
static gboolean
init_widgets (TaskPage *tpage)
{
    CompEditor *editor;
    TaskPagePrivate *priv;
    GtkAction *action;
    GtkTextBuffer *text_buffer;
    icaltimezone *zone;
    gboolean active;
    GtkAdjustment *adjustment;

    priv = tpage->priv;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));

    /* Make sure the EDateEdit widgets use our timezones to get the
     * current time. */
    e_date_edit_set_get_time_callback (
        E_DATE_EDIT (priv->start_date),
        (EDateEditGetTimeCallback) comp_editor_get_current_time,
        g_object_ref (editor),
        (GDestroyNotify) g_object_unref);
    e_date_edit_set_get_time_callback (
        E_DATE_EDIT (priv->due_date),
        (EDateEditGetTimeCallback) comp_editor_get_current_time,
        g_object_ref (editor),
        (GDestroyNotify) g_object_unref);

    /* Generic informative messages */
    gtk_widget_hide (priv->info_hbox);

    /* Summary */
    g_signal_connect (
        priv->summary, "changed",
        G_CALLBACK (summary_changed_cb), tpage);

    /* Description */
    text_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (priv->description));

    gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (priv->description), GTK_WRAP_WORD);

    e_buffer_tagger_connect (GTK_TEXT_VIEW (priv->description));

    /* Dates */
    g_signal_connect (
        priv->start_date, "changed",
        G_CALLBACK (date_changed_cb), tpage);
    g_signal_connect (
        priv->due_date, "changed",
        G_CALLBACK (date_changed_cb), tpage);

    /* time zone changed */
    g_signal_connect (
        priv->timezone, "changed",
        G_CALLBACK (timezone_changed_cb), tpage);

    /* Categories button */
    g_signal_connect (
        priv->categories_btn, "clicked",
        G_CALLBACK (categories_clicked_cb), tpage);

    /* Source selector */
    g_signal_connect (
        priv->client_combo_box, "changed",
        G_CALLBACK (source_changed_cb), tpage);

    /* Connect the default signal handler to use to make sure the "changed"
     * field gets set whenever a field is changed. */

    /* Belongs to priv->description */
    g_signal_connect_swapped (
        text_buffer, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->summary, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->start_date, "changed",
        G_CALLBACK (start_date_changed_cb), tpage);
    g_signal_connect_swapped (
        priv->start_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->due_date, "changed",
        G_CALLBACK (due_date_changed_cb), tpage);
    g_signal_connect_swapped (
        priv->due_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->timezone, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);
    g_signal_connect_swapped (
        priv->categories, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);

    g_signal_connect (
        priv->list_view, "event",
        G_CALLBACK (list_view_event), tpage);
    g_signal_connect (
        priv->list_view, "key_press_event",
        G_CALLBACK (list_key_press), tpage);

    /* Add attendee button */
    g_signal_connect (
        priv->add, "clicked",
        G_CALLBACK (add_clicked_cb), tpage);

    /* Edit attendee button */
    g_signal_connect (
        priv->edit, "clicked",
        G_CALLBACK (edit_clicked_cb), tpage);

    /* Remove attendee button */
    g_signal_connect (
        priv->remove, "clicked",
        G_CALLBACK (remove_clicked_cb), tpage);

    /* Contacts button */
    g_signal_connect (
        priv->invite, "clicked",
        G_CALLBACK (invite_cb), tpage);

    /* Meeting List View */
    g_signal_connect (
        priv->list_view, "attendee_added",
        G_CALLBACK (attendee_added_cb), tpage);

    /* Set the default timezone, so the timezone entry may be hidden. */
    zone = comp_editor_get_timezone (editor);
    e_timezone_entry_set_default_timezone (E_TIMEZONE_ENTRY (priv->timezone), zone);

    /* Make sure the EDateEdit widgets use our timezones to get the
     * current time. */
    e_date_edit_set_get_time_callback (
        E_DATE_EDIT (priv->completed_date),
        (EDateEditGetTimeCallback) comp_editor_get_current_time,
        g_object_ref (editor),
        (GDestroyNotify) g_object_unref);

    /* Connect signals. The Status, Percent Complete & Date Completed
     * properties are closely related so whenever one changes we may need
     * to update the other 2. */
    g_signal_connect (
        GTK_COMBO_BOX (priv->status_combo), "changed",
        G_CALLBACK (status_changed), tpage);

    adjustment = gtk_spin_button_get_adjustment (
        GTK_SPIN_BUTTON (priv->percent_complete));
    g_signal_connect (
        adjustment, "value_changed",
        G_CALLBACK (percent_complete_changed), tpage);

    /* Priority */
    g_signal_connect_swapped (
        GTK_COMBO_BOX (priv->priority_combo), "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);

    /* Completed Date */
    g_signal_connect (
        priv->completed_date, "changed",
        G_CALLBACK (completed_date_changed_cb), tpage);
    g_signal_connect_swapped (
        priv->completed_date, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);

    /* URL */
    g_signal_connect_swapped (
        priv->web_page_entry, "changed",
        G_CALLBACK (comp_editor_page_changed), tpage);

    action = comp_editor_get_action (editor, "view-time-zone");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_timezone (tpage, active);

    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_ATTENDEE_COL, TRUE);

    action = comp_editor_get_action (editor, "view-role");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_ROLE_COL, active);

    action = comp_editor_get_action (editor, "view-rsvp");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_RSVP_COL, active);

    action = comp_editor_get_action (editor, "view-status");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_STATUS_COL, active);

    action = comp_editor_get_action (editor, "view-type");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    e_meeting_list_view_column_set_visible (
        priv->list_view, E_MEETING_STORE_TYPE_COL, active);

    action = comp_editor_get_action (editor, "view-categories");
    active = gtk_toggle_action_get_active (GTK_TOGGLE_ACTION (action));
    task_page_set_show_categories (tpage, active);

    /* Classification */
    action = comp_editor_get_action (editor, "classify-public");
    g_object_bind_property_full (
        action, "current-value",
        priv->classification_combo, "active",
        G_BINDING_BIDIRECTIONAL | G_BINDING_SYNC_CREATE,
        task_page_transform_classification_to_combo,
        task_page_transform_classification_from_combo,
        NULL, NULL);

    return TRUE;
}

static void
task_page_select_organizer (TaskPage *tpage,
                            const gchar *backend_address)
{
    TaskPagePrivate *priv = tpage->priv;
    const gchar *default_address;
    gint ii;

    /* Treat an empty backend address as NULL. */
    if (backend_address != NULL && *backend_address == '\0')
        backend_address = NULL;

    default_address = priv->fallback_address;

    if (backend_address != NULL) {
        for (ii = 0; priv->address_strings[ii] != NULL; ii++) {
            if (g_strrstr (priv->address_strings[ii], backend_address) != NULL) {
                default_address = priv->address_strings[ii];
                break;
            }
        }
    }

    if (default_address != NULL) {
        if (!priv->comp || !e_cal_component_has_organizer (priv->comp)) {
            GtkEntry *entry = GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->organizer)));

            g_signal_handlers_block_by_func (entry, organizer_changed_cb, tpage);
            gtk_entry_set_text (entry, default_address);
            g_signal_handlers_unblock_by_func (entry, organizer_changed_cb, tpage);
        }
    } else
        g_warning ("No potential organizers!");
}

/**
 * task_page_construct:
 * @tpage: An task page.
 *
 * Constructs an task page by loading its Glade data.
 *
 * Return value: The same object as @tpage, or NULL if the widgets could not be
 * created.
 **/
TaskPage *
task_page_construct (TaskPage *tpage,
                     EMeetingStore *meeting_store,
                     ECalClient *client)
{
    EShell *shell;
    CompEditor *editor;
    ESourceRegistry *registry;
    EFocusTracker *focus_tracker;
    TaskPagePrivate *priv;
    GtkComboBox *combo_box;
    GtkListStore *list_store;
    GtkTreeModel *model;
    GtkTreeIter iter;
    gint ii;

    editor = comp_editor_page_get_editor (COMP_EDITOR_PAGE (tpage));
    shell = comp_editor_get_shell (editor);
    focus_tracker = comp_editor_get_focus_tracker (editor);

    priv = tpage->priv;
    priv->meeting_store = g_object_ref (meeting_store);
    priv->client = client;

    /* Make sure our custom widget classes are registered with
     * GType before we load the GtkBuilder definition file. */
    g_type_ensure (E_TYPE_CLIENT_COMBO_BOX);
    g_type_ensure (E_TYPE_DATE_EDIT);
    g_type_ensure (E_TYPE_TIMEZONE_ENTRY);
    g_type_ensure (E_TYPE_SOURCE_COMBO_BOX);
    g_type_ensure (E_TYPE_SPELL_ENTRY);
    g_type_ensure (E_TYPE_URL_ENTRY);

    priv->builder = gtk_builder_new ();
    e_load_ui_builder_definition (priv->builder, "task-page.ui");

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

    e_spell_text_view_attach (GTK_TEXT_VIEW (priv->description));
    e_widget_undo_attach (priv->summary, focus_tracker);
    e_widget_undo_attach (priv->categories, focus_tracker);
    e_widget_undo_attach (priv->web_page_entry, focus_tracker);
    e_widget_undo_attach (priv->description, focus_tracker);

    combo_box = GTK_COMBO_BOX (priv->organizer);
    model = gtk_combo_box_get_model (combo_box);
    list_store = GTK_LIST_STORE (model);

    registry = e_shell_get_registry (shell);
    priv->address_strings = itip_get_user_identities (registry);
    priv->fallback_address = itip_get_fallback_identity (registry);

    /* FIXME Could we just use a GtkComboBoxText? */
    for (ii = 0; priv->address_strings[ii] != NULL; ii++) {
        gtk_list_store_append (list_store, &iter);
        gtk_list_store_set (
            list_store, &iter,
            0, priv->address_strings[ii], -1);
    }

    gtk_combo_box_set_active (combo_box, 0);

    g_signal_connect (
        gtk_bin_get_child (GTK_BIN (priv->organizer)), "changed",
        G_CALLBACK (organizer_changed_cb), tpage);

    if (!init_widgets (tpage)) {
        g_message (
            "task_page_construct(): "
            "Could not initialize the widgets!");
        return NULL;
    }

    return tpage;
}

/**
 * task_page_new:
 *
 * Creates a new task page.
 *
 * Return value: A newly-created task page, or NULL if the page could
 * not be created.
 **/
TaskPage *
task_page_new (EMeetingStore *model,
               CompEditor *editor)
{
    TaskPage *tpage;
    ECalClient *client;

    tpage = g_object_new (TYPE_TASK_PAGE, "editor", editor, NULL);
    client = comp_editor_get_client (editor);
    if (!task_page_construct (tpage, model, client)) {
        g_object_unref (tpage);
        g_return_val_if_reached (NULL);
    }

    return tpage;
}

ECalComponent *
task_page_get_cancel_comp (TaskPage *page)
{
    TaskPagePrivate *priv;

    g_return_val_if_fail (page != NULL, NULL);
    g_return_val_if_fail (IS_TASK_PAGE (page), NULL);

    priv = page->priv;

    if (priv->deleted_attendees->len == 0)
        return NULL;

    set_attendees (priv->comp, priv->deleted_attendees);

    return e_cal_component_clone (priv->comp);
}