path: root/calendar/gui/e-tasks.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* e-tasks.c
 *
 * Copyright (C) 2001-2003  Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Authors: Federico Mena Quintero <federico@ximian.com>
 *      Damon Chaplin <damon@ximian.com>
 *          Rodrigo Moya <rodrigo@ximian.com>
 */

#include <config.h>
#include <gnome.h>
#include <libgnomevfs/gnome-vfs-ops.h>
#include <gal/util/e-util.h>
#include <gal/e-table/e-table-scrolled.h>
#include <gal/menus/gal-view-instance.h>
#include <gal/menus/gal-view-factory-etable.h>
#include <gal/menus/gal-view-etable.h>
#include <gtkhtml/gtkhtml.h>
#include <gtkhtml/gtkhtml-stream.h>

#include "e-util/e-categories-config.h"
#include "e-util/e-time-utils.h"
#include "e-util/e-url.h"
#include <libecal/e-cal-time-util.h>
#include "widgets/menus/gal-view-menus.h"
#include "dialogs/delete-error.h"
#include "dialogs/task-editor.h"
#include "cal-search-bar.h"
#include "calendar-config.h"
#include "calendar-component.h"
#include "comp-util.h"
#include "e-calendar-table-config.h"
#include "misc.h"
#include "tasks-component.h"
#include "e-tasks.h"
#include "common/authentication.h"


/* Private part of the GnomeCalendar structure */
struct _ETasksPrivate {
    /* The task lists for display */
    GHashTable *clients;
    GList *clients_list;

    ECalView *query;
    
    /* The ECalendarTable showing the tasks. */
    GtkWidget   *tasks_view;
    ECalendarTableConfig *tasks_view_config;
    
    /* Calendar search bar for tasks */
    GtkWidget *search_bar;

    /* The HTML widget to display the task's details */
    GtkWidget *html;
    gchar *current_uid;

    /* View instance and the view menus handler */
    GalViewInstance *view_instance;
    GalViewMenus *view_menus;

    GList *notifications;
};


static void e_tasks_class_init (ETasksClass *class);
static void e_tasks_init (ETasks *tasks);
static void setup_widgets (ETasks *tasks);
static void e_tasks_destroy (GtkObject *object);

static void backend_error_cb (ECal *client, const char *message, gpointer data);

/* Signal IDs */
enum {
    SELECTION_CHANGED,
    LAST_SIGNAL
};

static GtkTableClass *parent_class;
static guint e_tasks_signals[LAST_SIGNAL] = { 0 };


E_MAKE_TYPE (e_tasks, "ETasks", ETasks,
         e_tasks_class_init, e_tasks_init,
         GTK_TYPE_TABLE)

/* Converts a time_t to a string, relative to the specified timezone */
static char *
timet_to_str_with_zone (time_t t, icaltimezone *zone)
{
        struct icaltimetype itt;
        struct tm tm;
        char buf[256];
                                                                                              
        if (t == -1)
                return g_strdup (_("invalid time"));
                                                                                              
        itt = icaltime_from_timet_with_zone (t, FALSE, zone);
        tm = icaltimetype_to_tm (&itt);
                                                                                              
        e_time_format_date_and_time (&tm, calendar_config_get_24_hour_format (),
                                     FALSE, FALSE, buf, sizeof (buf));
        return g_strdup (buf);
}

static void
write_html (GtkHTMLStream *stream, ECalComponent *comp)
{
    ECalComponentText text;
    ECalComponentDateTime dt;
    gchar *buf, *str;
    icaltimezone *current_zone;
    GSList *l;
    icalproperty_status status;
    int *priority_value;

    g_return_if_fail (E_IS_CAL_COMPONENT (comp));

    current_zone = calendar_config_get_icaltimezone ();

    /* write document header */
    e_cal_component_get_summary (comp, &text);
    gtk_html_stream_printf (stream,
                "<HTML><BODY><H1>%s</H1>",
                text.value);

    /* write icons for the categories */
    e_cal_component_get_categories_list (comp, &l);
    if (l) {
        GSList *node;

        for (node = l; node != NULL; node = node->next) {
            const char *icon_file;

            icon_file = e_categories_config_get_icon_file_for ((const char *) node->data);
            if (icon_file) {
                gtk_html_stream_printf (stream, "<IMG ALT=\"%s\" SRC=\"file://%s\">",
                            (const char *) node->data, icon_file);
            }
        }

        e_cal_component_free_categories_list (l);
    }
    
    /* write summary */
    gtk_html_stream_printf (stream,
                "<BR><BR><BR><TABLE BORDER=\"0\" WIDTH=\"80%%\">"
                "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\" WIDTH=\"15%%\"><B>%s</B></TD><TD>%s</TD></TR>",
                _("Summary:"), text.value);

    /* write start date */
    e_cal_component_get_dtstart (comp, &dt);
    if (dt.value != NULL) {
        buf = timet_to_str_with_zone (icaltime_as_timet (*dt.value), current_zone);
        str = g_locale_to_utf8 (buf, -1, NULL, NULL, NULL);

        g_free (buf);
    } else
        str = g_strdup ("");

    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD><TD>%s</TD></TR>",
                _("Start Date:"), str);

    e_cal_component_free_datetime (&dt);
    g_free (str);

    /* write Due Date */
    e_cal_component_get_due (comp, &dt);
    if (dt.value != NULL) {
        buf = timet_to_str_with_zone (icaltime_as_timet (*dt.value), current_zone);
        str = g_locale_to_utf8 (buf, -1, NULL, NULL, NULL);

        g_free (buf);
    } else
        str = g_strdup ("");

    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD><TD>%s</TD></TR>",
                _("Due Date:"), str);

    e_cal_component_free_datetime (&dt);
    g_free (str);

    /* write status */
    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Status:"));
    e_cal_component_get_status (comp, &status);
    switch (status) {
    case ICAL_STATUS_INPROCESS :
        str = g_strdup (_("In Progress"));
        break;
    case ICAL_STATUS_COMPLETED :
        str = g_strdup (_("Completed"));
        break;
    case ICAL_STATUS_CANCELLED :
        str = g_strdup (_("Cancelled"));
        break;
    case ICAL_STATUS_NONE :
    default :
        str = g_strdup (_("Not Started"));
        break;
    }

    gtk_html_stream_printf (stream, "<TD>%s</TD></TR>", str);
    g_free (str);

    /* write priority */
    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Priority:"));
    e_cal_component_get_priority (comp, &priority_value);
    if (priority_value) {
        if (*priority_value == 0)
            str = g_strdup ("");
        else if (*priority_value <= 4)
            str = g_strdup (_("High"));
        else if (*priority_value == 5)
            str = g_strdup (_("Normal"));
        else
            str = g_strdup (_("Low"));

        gtk_html_stream_printf (stream, "<TD>%s</TD></TR>", str);

        g_free (str);
        e_cal_component_free_priority (priority_value);
    } else
        gtk_html_stream_printf (stream, "<TD></TD></TR>");
    
    /* write description and URL */
    gtk_html_stream_printf (stream, "<TR><TD COLSPAN=\"2\"><HR></TD></TR>");

    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Description:"));
    e_cal_component_get_description_list (comp, &l);
    if (l) {
        GSList *node;

        gtk_html_stream_printf (stream, "<TD>");

        for (node = l; node != NULL; node = node->next) {
            gint i;
            GString *str = g_string_new ("");;

            text = * (ECalComponentText *) node->data;
            for (i = 0; i < strlen (text.value ? text.value : 0); i++) {
                if (text.value[i] == '\n')
                    str = g_string_append (str, "<BR>");
                else if (text.value[i] == '<')
                    str = g_string_append (str, "&lt;");
                else if (text.value[i] == '>')
                    str = g_string_append (str, "&gt;");
                else
                    str = g_string_append_c (str, text.value[i]);
            }

            gtk_html_stream_printf (stream, str->str);
            g_string_free (str, TRUE);
        }

        gtk_html_stream_printf (stream, "</TD></TR>");

        e_cal_component_free_text_list (l);
    } else
        gtk_html_stream_printf (stream, "<TD></TD></TR>");

    /* URL */
    gtk_html_stream_printf (stream, "<TR><TD VALIGN=\"TOP\" ALIGN=\"RIGHT\"><B>%s</B></TD>", _("Web Page:"));
    e_cal_component_get_url (comp, (const char **) &str);
    if (str)
        gtk_html_stream_printf (stream, "<TD><A HREF=\"%s\">%s</A></TD></TR>", str, str);
    else
        gtk_html_stream_printf (stream, "<TD></TD></TR>");

    gtk_html_stream_printf (stream, "</TABLE>");

    /* close document */
    gtk_html_stream_printf (stream, "</BODY></HTML>");
}

static void
on_link_clicked (GtkHTML *html, const char *url, gpointer data)
{
        GError *err = NULL;

        gnome_url_show (url, &err);

    if (err) {
        g_warning ("gnome_url_show: %s", err->message);
                g_error_free (err);
        }
}

static void
on_url_cb (GtkHTML *html, const char *url, gpointer data)
{
    char *msg;
    ETasks *tasks = data;

    if (url && *url) {
        msg = g_strdup_printf (_("Click to open %s"), url);
        e_calendar_table_set_status_message (e_tasks_get_calendar_table (tasks), msg);
        g_free (msg);
    } else
        e_calendar_table_set_status_message (e_tasks_get_calendar_table (tasks), NULL);
}

/* Callback used when the cursor changes in the table */
static void
table_cursor_change_cb (ETable *etable, int row, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    int n_selected;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    n_selected = e_table_selected_count (etable);

    /* update the HTML widget */
    if (n_selected == 1) {
        GtkHTMLStream *stream;
        ECalModel *model;
        ECalModelComponent *comp_data;
        ECalComponent *comp;
        const char *uid;

        model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));

        stream = gtk_html_begin (GTK_HTML (priv->html));

        comp_data = e_cal_model_get_component_at (model, e_table_get_cursor_row (etable));
        comp = e_cal_component_new ();
        e_cal_component_set_icalcomponent (comp, icalcomponent_new_clone (comp_data->icalcomp));
        write_html (stream, comp);

        gtk_html_stream_close (stream, GTK_HTML_STREAM_OK);

        e_cal_component_get_uid (comp, &uid);
        if (priv->current_uid)
            g_free (priv->current_uid);
        priv->current_uid = g_strdup (uid);

        g_object_unref (comp);
    } else
        gtk_html_load_empty (GTK_HTML (priv->html));
}

/* Callback used when the selection changes in the table. */
static void
table_selection_change_cb (ETable *etable, gpointer data)
{
    ETasks *tasks;
    int n_selected;

    tasks = E_TASKS (data);

    n_selected = e_table_selected_count (etable);
    gtk_signal_emit (GTK_OBJECT (tasks), e_tasks_signals[SELECTION_CHANGED],
             n_selected);
}

/* Callback used when the sexp in the search bar changes */
static void
search_bar_sexp_changed_cb (CalSearchBar *cal_search, const char *sexp, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    ECalModel *model;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    e_cal_model_set_query (model, sexp);
}

/* Callback used when the selected category in the search bar changes */
static void
search_bar_category_changed_cb (CalSearchBar *cal_search, const char *category, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    ECalModel *model;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    e_cal_model_set_default_category (model, category);
}

/* Callback used when the user selects a URL in the HTML widget */
static void
url_requested_cb (GtkHTML *html, const char *url, GtkHTMLStream *stream, gpointer data)
{
    if (!strncmp ("file:///", url, strlen ("file:///"))) {
        GnomeVFSHandle *handle;
        GnomeVFSResult result;
        char buffer[4096];

        if (gnome_vfs_open (&handle, url, GNOME_VFS_OPEN_READ) == GNOME_VFS_OK) {
            do {
                GnomeVFSFileSize bread;

                result = gnome_vfs_read (handle, buffer, sizeof (buffer), &bread);
                if (result == GNOME_VFS_OK)
                    gtk_html_stream_write (stream, buffer, bread);
            } while (result == GNOME_VFS_OK);

            gnome_vfs_close (handle);
        }
    }
}

static gboolean
vpaned_resized_cb (GtkWidget *widget, GdkEventButton *event, ETasks *tasks)
{
    calendar_config_set_task_vpane_pos (gtk_paned_get_position (GTK_PANED (widget)));

    return FALSE;
}

static void
set_timezone (ETasks *tasks) 
{
    ETasksPrivate *priv;
    icaltimezone *zone;
    GList *l;
    
    priv = tasks->priv;
    
    zone = calendar_config_get_icaltimezone ();
    for (l = priv->clients_list; l != NULL; l = l->next) {
        ECal *client = l->data;

        if (e_cal_get_load_state (client) == E_CAL_LOAD_LOADED)
            /* FIXME Error checking */
            e_cal_set_default_timezone (client, zone, NULL);
    }
}

static void
timezone_changed_cb (GConfClient *client, guint id, GConfEntry *entry, gpointer data)
{
    ETasks *tasks = data;
    
    set_timezone (tasks);
}

static void
model_row_changed_cb (ETableModel *etm, int row, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    ECalModelComponent *comp_data;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    if (priv->current_uid) {
        const char *uid;

        comp_data = e_cal_model_get_component_at (E_CAL_MODEL (etm), row);
        if (comp_data) {
            uid = icalcomponent_get_uid (comp_data->icalcomp);
            if (!strcmp (uid ? uid : "", priv->current_uid)) {
                ETable *etable;

                etable = e_table_scrolled_get_table (
                    E_TABLE_SCROLLED (E_CALENDAR_TABLE (priv->tasks_view)->etable));
                table_cursor_change_cb (etable, 0, tasks);
            }
        }
    }
}

static void
model_rows_deleted_cb (ETableModel *etm, int row, int count, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    ECalModelComponent *comp_data;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    if (priv->current_uid) {
        const char *uid;
        int i;

        for (i = row; i < row + count; i++) {
            comp_data = e_cal_model_get_component_at (E_CAL_MODEL (etm), i);
            if (comp_data) {
                uid = icalcomponent_get_uid (comp_data->icalcomp);
                if (!strcmp (uid ? uid : "", priv->current_uid)) {
                    ETable *etable;

                    etable = e_table_scrolled_get_table (
                        E_TABLE_SCROLLED (E_CALENDAR_TABLE (priv->tasks_view)->etable));
                    table_cursor_change_cb (etable, 0, tasks);
                    break;
                }
            }
        }
    }
}

static void
setup_config (ETasks *tasks)
{
    ETasksPrivate *priv;
    guint not;

    priv = tasks->priv;
    
    /* Timezone */
    set_timezone (tasks);
    
    not = calendar_config_add_notification_timezone (timezone_changed_cb, tasks);
    priv->notifications = g_list_prepend (priv->notifications, GUINT_TO_POINTER (not));
}

#define E_TASKS_TABLE_DEFAULT_STATE                 \
    "<?xml version=\"1.0\"?>"                   \
    "<ETableState>"                         \
    "<column source=\"13\"/>"                   \
    "<column source=\"14\"/>"                   \
    "<column source=\"9\"/>"                    \
    "<column source=\"5\"/>"                    \
    "<grouping/>"                           \
    "</ETableState>"

static void
setup_widgets (ETasks *tasks)
{
    ETasksPrivate *priv;
    ETable *etable;
    ECalModel *model;
    GtkWidget *paned, *scroll;

    priv = tasks->priv;

    priv->search_bar = cal_search_bar_new ();
    g_signal_connect (priv->search_bar, "sexp_changed",
              G_CALLBACK (search_bar_sexp_changed_cb), tasks);
    g_signal_connect (priv->search_bar, "category_changed",
              G_CALLBACK (search_bar_category_changed_cb), tasks);

    gtk_table_attach (GTK_TABLE (tasks), priv->search_bar, 0, 1, 0, 1,
              GTK_EXPAND | GTK_FILL | GTK_SHRINK, 0, 0, 0);
    gtk_widget_show (priv->search_bar);

    /* add the paned widget for the task list and task detail areas */
    paned = gtk_vpaned_new ();
    gtk_paned_set_position (GTK_PANED (paned), calendar_config_get_task_vpane_pos ());
    g_signal_connect (G_OBJECT (paned), "button_release_event",
              G_CALLBACK (vpaned_resized_cb), tasks);
    gtk_table_attach (GTK_TABLE (tasks), paned, 0, 1, 1, 2,
              GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL, 0, 0);
    gtk_widget_show (paned);

    /* create the task list */
    priv->tasks_view = e_calendar_table_new ();
    priv->tasks_view_config = e_calendar_table_config_new (E_CALENDAR_TABLE (priv->tasks_view));
    
    etable = e_table_scrolled_get_table (
        E_TABLE_SCROLLED (E_CALENDAR_TABLE (priv->tasks_view)->etable));
    e_table_set_state (etable, E_TASKS_TABLE_DEFAULT_STATE);
    gtk_paned_add1 (GTK_PANED (paned), priv->tasks_view);
    gtk_widget_show (priv->tasks_view);

    g_signal_connect (etable, "cursor_change", G_CALLBACK (table_cursor_change_cb), tasks);
    g_signal_connect (etable, "selection_change", G_CALLBACK (table_selection_change_cb), tasks);

    /* create the task detail */
    priv->html = gtk_html_new ();
    gtk_html_set_default_content_type (GTK_HTML (priv->html), "charset=utf-8");
    gtk_html_load_empty (GTK_HTML (priv->html));

    g_signal_connect (G_OBJECT (priv->html), "url_requested",
              G_CALLBACK (url_requested_cb), NULL);
    g_signal_connect (G_OBJECT (priv->html), "link_clicked",
              G_CALLBACK (on_link_clicked), tasks);
    g_signal_connect (G_OBJECT (priv->html), "on_url",
              G_CALLBACK (on_url_cb), tasks);

    gtk_widget_pop_colormap ();
    scroll = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scroll),
                    GTK_POLICY_AUTOMATIC,
                    GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scroll), GTK_SHADOW_IN);
    gtk_container_add (GTK_CONTAINER (scroll), priv->html);
    gtk_paned_add2 (GTK_PANED (paned), scroll);
    gtk_widget_show_all (scroll);

    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    g_signal_connect (G_OBJECT (model), "model_row_changed",
              G_CALLBACK (model_row_changed_cb), tasks);
    g_signal_connect (G_OBJECT (model), "model_rows_deleted",
              G_CALLBACK (model_rows_deleted_cb), tasks);
}

/* Class initialization function for the gnome calendar */
static void
e_tasks_class_init (ETasksClass *class)
{
    GtkObjectClass *object_class;

    object_class = (GtkObjectClass *) class;

    parent_class = gtk_type_class (GTK_TYPE_TABLE);

    e_tasks_signals[SELECTION_CHANGED] =
        gtk_signal_new ("selection_changed",
                GTK_RUN_LAST,
                G_TYPE_FROM_CLASS (object_class), 
                GTK_SIGNAL_OFFSET (ETasksClass, selection_changed),
                gtk_marshal_NONE__INT,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_INT);

    object_class->destroy = e_tasks_destroy;

    class->selection_changed = NULL;
}


/* Object initialization function for the gnome calendar */
static void
e_tasks_init (ETasks *tasks)
{
    ETasksPrivate *priv;

    priv = g_new0 (ETasksPrivate, 1);
    tasks->priv = priv;

    setup_config (tasks);
    setup_widgets (tasks);

    priv->clients = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);    
    priv->query = NULL;
    priv->view_instance = NULL;
    priv->view_menus = NULL;
    priv->current_uid = NULL;
}

/* Callback used when the set of categories changes in the calendar client */
static void
client_categories_changed_cb (ECal *client, GPtrArray *categories, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    cal_search_bar_set_categories (CAL_SEARCH_BAR (priv->search_bar), categories);
}

GtkWidget *
e_tasks_new (void)
{
    ETasks *tasks;

    tasks = g_object_new (e_tasks_get_type (), NULL);

    return GTK_WIDGET (tasks);
}


void
e_tasks_set_ui_component (ETasks *tasks,
              BonoboUIComponent *ui_component)
{
    g_return_if_fail (E_IS_TASKS (tasks));
    g_return_if_fail (ui_component == NULL || BONOBO_IS_UI_COMPONENT (ui_component));

    e_search_bar_set_ui_component (E_SEARCH_BAR (tasks->priv->search_bar), ui_component);
}


static void
e_tasks_destroy (GtkObject *object)
{
    ETasks *tasks;
    ETasksPrivate *priv;

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

    tasks = E_TASKS (object);
    priv = tasks->priv;

    if (priv) {
        GList *l;

        /* disconnect from signals on all the clients */
        for (l = priv->clients_list; l != NULL; l = l->next) {
            g_signal_handlers_disconnect_matched (l->data, G_SIGNAL_MATCH_DATA,
                                  0, 0, NULL, NULL, tasks);
        }

        g_hash_table_destroy (priv->clients);
        g_list_free (priv->clients_list);

        if (priv->current_uid) {
            g_free (priv->current_uid);
            priv->current_uid = NULL;
        }

        if (priv->tasks_view_config) {
            g_object_unref (priv->tasks_view_config);
            priv->tasks_view_config = NULL;
        }
        
        for (l = priv->notifications; l; l = l->next)
            calendar_config_remove_notification (GPOINTER_TO_UINT (l->data));
        priv->notifications = NULL;
        
        g_free (priv);
        tasks->priv = NULL;
    }

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

static void
set_status_message (ETasks *tasks, const char *message, ...)
{
    ETasksPrivate *priv;
    va_list args;
    char sz[2048];
    
    va_start (args, message);
    vsnprintf (sz, sizeof sz, message, args);
    va_end (args);

    priv = tasks->priv;
    
    e_calendar_table_set_status_message (E_CALENDAR_TABLE (priv->tasks_view), sz);
}

/* Callback from the calendar client when an error occurs in the backend */
static void
backend_error_cb (ECal *client, const char *message, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    char *errmsg;
    char *urinopwd;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    urinopwd = get_uri_without_password (e_cal_get_uri (client));
    errmsg = g_strdup_printf (_("Error on %s:\n %s"), urinopwd, message);
    gnome_error_dialog_parented (errmsg, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (tasks))));
    g_free (errmsg);
    g_free (urinopwd);
}

/* Callback from the calendar client when the backend dies */
static void
backend_died_cb (ECal *client, gpointer data)
{
    ETasks *tasks;
    ETasksPrivate *priv;
    char *message;
    GtkWidget *dialog;

    tasks = E_TASKS (data);
    priv = tasks->priv;

    /* FIXME: this doesn't remove the task list from the list or anything */
    message = g_strdup_printf (_("The task backend for\n%s\n has crashed."), e_cal_get_uri (client));
    e_calendar_table_set_status_message (E_CALENDAR_TABLE (e_tasks_get_calendar_table (tasks)), NULL);

    dialog = gtk_message_dialog_new (GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (tasks))),
                     0, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
                     message);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
    g_free (message);

    e_source_selector_unselect_source (
        tasks_component_peek_source_selector (tasks_component_peek ()),
        e_cal_get_source (client));

    g_hash_table_remove (priv->clients, e_cal_get_uri (client));
    priv->clients_list = g_list_remove (priv->clients_list, client);
    g_object_unref (client);
}

void
e_tasks_open_task           (ETasks     *tasks)
{
    ECalendarTable *cal_table;
                                                                                
    cal_table = e_tasks_get_calendar_table (tasks);
    e_calendar_table_open_selected (cal_table);
}

void
e_tasks_new_task            (ETasks     *tasks)
{
    ETasksPrivate *priv;
    TaskEditor *tedit;
    ECalComponent *comp;
    const char *category;
    ECal *ecal;
    
    g_return_if_fail (E_IS_TASKS (tasks));

    priv = tasks->priv;

    /* FIXME What to do about no default client */
    ecal = e_tasks_get_default_client (tasks);
    if (!ecal)
        return;
    
    comp = cal_comp_task_new_with_defaults (ecal);

    category = cal_search_bar_get_category (CAL_SEARCH_BAR (priv->search_bar));
    e_cal_component_set_categories (comp, category);

    tedit = task_editor_new (ecal);
    comp_editor_edit_comp (COMP_EDITOR (tedit), comp);
    g_object_unref (comp);

    comp_editor_focus (COMP_EDITOR (tedit));
}

gboolean
e_tasks_add_todo_source (ETasks *tasks, ESource *source)
{
    ETasksPrivate *priv;
    ECal *client;
    ECalModel *model;
    char *str_uri;
    GError *error = NULL;

    g_return_val_if_fail (tasks != NULL, FALSE);
    g_return_val_if_fail (E_IS_TASKS (tasks), FALSE);
    g_return_val_if_fail (E_IS_SOURCE (source), FALSE);

    priv = tasks->priv;

    str_uri = e_source_get_uri (source);
    client = g_hash_table_lookup (priv->clients, str_uri);
    if (client) {
        g_free (str_uri);
        return TRUE;
    }

    set_status_message (tasks, _("Opening tasks at %s"), str_uri);

    client = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_TODO);
    if (!client) {
        g_free (str_uri);
        return FALSE;
    }

    g_hash_table_insert (priv->clients, str_uri, client);
    priv->clients_list = g_list_prepend (priv->clients_list, client);
    
    g_signal_connect (G_OBJECT (client), "backend_error", G_CALLBACK (backend_error_cb), tasks);
    g_signal_connect (G_OBJECT (client), "categories_changed", G_CALLBACK (client_categories_changed_cb), tasks);
    g_signal_connect (G_OBJECT (client), "backend_died", G_CALLBACK (backend_died_cb), tasks);

    if (!e_cal_open (client, FALSE, &error)) {
        GtkWidget *dialog;

        dialog = gtk_message_dialog_new (GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (tasks))),
                         GTK_DIALOG_NO_SEPARATOR,
                         GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
                         _("Error opening %s:\n%s"),
                         str_uri, error ? error->message : "");

        g_error_free (error);
        priv->clients_list = g_list_prepend (priv->clients_list, client);
        g_signal_handlers_disconnect_matched (client, G_SIGNAL_MATCH_DATA,
                              0, 0, NULL, NULL, tasks); 

        /* Do this last because it unrefs the client */
        g_hash_table_remove (priv->clients, str_uri);

        gtk_dialog_run (GTK_DIALOG (dialog));
        gtk_widget_destroy (dialog);

        set_status_message (tasks, NULL);

        return FALSE;
    }

    set_status_message (tasks, _("Loading tasks"));
    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    e_cal_model_add_client (model, client);

    set_timezone (tasks);
    set_status_message (tasks, NULL);

    return TRUE;
}

gboolean
e_tasks_remove_todo_source (ETasks *tasks, ESource *source)
{
    ETasksPrivate *priv;
    ECal *client;
    ECalModel *model;
    char *str_uri;

    g_return_val_if_fail (tasks != NULL, FALSE);
    g_return_val_if_fail (E_IS_TASKS (tasks), FALSE);
    g_return_val_if_fail (E_IS_SOURCE (source), FALSE);

    priv = tasks->priv;

    str_uri = e_source_get_uri (source);
    client = g_hash_table_lookup (priv->clients, str_uri);
    if (!client) {
        g_free (str_uri);
        return TRUE;
    }

    priv->clients_list = g_list_remove (priv->clients_list, client);
    g_signal_handlers_disconnect_matched (client, G_SIGNAL_MATCH_DATA,
                          0, 0, NULL, NULL, tasks); 

    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    e_cal_model_remove_client (model, client);

    g_hash_table_remove (priv->clients, str_uri);
    g_free (str_uri);

    return TRUE;
}

gboolean
e_tasks_set_default_source (ETasks *tasks, ESource *source)
{
    ETasksPrivate *priv;
    ECal *ecal;
    ECalModel *model;
    char *str_uri;
    
    g_return_val_if_fail (tasks != NULL, FALSE);
    g_return_val_if_fail (E_IS_TASKS (tasks), FALSE);
    g_return_val_if_fail (E_IS_SOURCE (source), FALSE);

    priv = tasks->priv;

    str_uri = e_source_get_uri (source);
    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view));
    ecal = e_cal_model_get_client_for_uri (model, str_uri);
    g_free (str_uri);
    if (!ecal)
        return FALSE;

    e_cal_model_set_default_client (model, ecal);

    return TRUE;
}

ECal *
e_tasks_get_default_client (ETasks *tasks)
{
    ETasksPrivate *priv;
    
    g_return_val_if_fail (tasks != NULL, NULL);
    g_return_val_if_fail (E_IS_TASKS (tasks), NULL);

    priv = tasks->priv;

    return e_cal_model_get_default_client (e_calendar_table_get_model (E_CALENDAR_TABLE (priv->tasks_view)));   
}

/**
 * e_tasks_complete_selected:
 * @tasks: A tasks control widget
 * 
 * Marks the selected tasks complete
 **/
void
e_tasks_complete_selected (ETasks *tasks)
{
    ETasksPrivate *priv;
    ECalendarTable *cal_table;

    g_return_if_fail (tasks != NULL);
    g_return_if_fail (E_IS_TASKS (tasks));

    priv = tasks->priv;

    cal_table = E_CALENDAR_TABLE (priv->tasks_view);

    set_status_message (tasks, _("Completing tasks..."));
    e_calendar_table_complete_selected (cal_table);
    set_status_message (tasks, NULL);
}

/**
 * e_tasks_delete_selected:
 * @tasks: A tasks control widget.
 * 
 * Deletes the selected tasks in the task list.
 **/
void
e_tasks_delete_selected (ETasks *tasks)
{
    ETasksPrivate *priv;
    ECalendarTable *cal_table;

    g_return_if_fail (tasks != NULL);
    g_return_if_fail (E_IS_TASKS (tasks));

    priv = tasks->priv;

    cal_table = E_CALENDAR_TABLE (priv->tasks_view);
    set_status_message (tasks, _("Deleting selected objects..."));
    e_calendar_table_delete_selected (cal_table);
    set_status_message (tasks, NULL);
}

/**
 * e_tasks_expunge:
 * @tasks: A tasks control widget
 * 
 * Removes all tasks marked as completed
 **/
void
e_tasks_delete_completed (ETasks *tasks)
{
    ETasksPrivate *priv;
    char *sexp;
    GList *l;
    
    g_return_if_fail (tasks != NULL);
    g_return_if_fail (E_IS_TASKS (tasks));

    priv = tasks->priv;

    sexp = g_strdup ("(is-completed?)");

    set_status_message (tasks, _("Expunging")); 

    for (l = priv->clients_list; l != NULL; l = l->next) {
        ECal *client = l->data;
        GList *objects, *m;
        gboolean read_only = TRUE;
        
        e_cal_is_read_only (client, &read_only, NULL);
        if (read_only)
            continue;
        
        if (!e_cal_get_object_list (client, sexp, &objects, NULL)) {
            g_warning (G_STRLOC ": Could not get the objects");
            
            continue;
        }
        
        for (m = objects; m; m = m->next) {
            /* FIXME Better error handling */
            e_cal_remove_object (client, icalcomponent_get_uid (m->data), NULL);
        }
    }

    set_status_message (tasks, NULL);

    g_free (sexp);
}

/* Callback used from the view collection when we need to display a new view */
static void
display_view_cb (GalViewInstance *instance, GalView *view, gpointer data)
{
    ETasks *tasks;

    tasks = E_TASKS (data);

    if (GAL_IS_VIEW_ETABLE (view)) {
        gal_view_etable_attach_table (GAL_VIEW_ETABLE (view), e_table_scrolled_get_table (E_TABLE_SCROLLED (E_CALENDAR_TABLE (tasks->priv->tasks_view)->etable)));
    }
}

/**
 * e_tasks_setup_view_menus:
 * @tasks: A tasks widget.
 * @uic: UI controller to use for the menus.
 * 
 * Sets up the #GalView menus for a tasks control.  This function should be
 * called from the Bonobo control activation callback for this tasks control.
 * Also, the menus should be discarded using e_tasks_discard_view_menus().
 **/
void
e_tasks_setup_view_menus (ETasks *tasks, BonoboUIComponent *uic)
{
    ETasksPrivate *priv;
    GalViewFactory *factory;
    ETableSpecification *spec;
    char *dir;
    static GalViewCollection *collection = NULL;

    g_return_if_fail (tasks != NULL);
    g_return_if_fail (E_IS_TASKS (tasks));
    g_return_if_fail (uic != NULL);
    g_return_if_fail (BONOBO_IS_UI_COMPONENT (uic));

    priv = tasks->priv;

    g_return_if_fail (priv->view_instance == NULL);

    g_assert (priv->view_instance == NULL);
    g_assert (priv->view_menus == NULL);

    /* Create the view instance */

    if (collection == NULL) {
        collection = gal_view_collection_new ();

        gal_view_collection_set_title (collection, _("Tasks"));

        dir = g_build_filename (tasks_component_peek_base_directory (tasks_component_peek ()), 
                    "tasks", "views", NULL);        
        gal_view_collection_set_storage_directories (collection,
                                 EVOLUTION_GALVIEWSDIR "/tasks/",
                                 dir);
        g_free (dir);

        /* Create the views */

        spec = e_table_specification_new ();
        e_table_specification_load_from_file (spec, 
                              EVOLUTION_ETSPECDIR "/e-calendar-table.etspec");

        factory = gal_view_factory_etable_new (spec);
        g_object_unref (spec);
        gal_view_collection_add_factory (collection, factory);
        g_object_unref (factory);

        /* Load the collection and create the menus */

        gal_view_collection_load (collection);
    }

    priv->view_instance = gal_view_instance_new (collection, e_cal_get_uri (e_tasks_get_default_client (tasks)));

    priv->view_menus = gal_view_menus_new (priv->view_instance);
    gal_view_menus_apply (priv->view_menus, uic, NULL);
    g_signal_connect (priv->view_instance, "display_view", G_CALLBACK (display_view_cb), tasks);
    display_view_cb (priv->view_instance, gal_view_instance_get_current_view (priv->view_instance), tasks);
}

/**
 * e_tasks_discard_view_menus:
 * @tasks: A tasks widget.
 * 
 * Discards the #GalView menus used by a tasks control.  This function should be
 * called from the Bonobo control deactivation callback for this tasks control.
 * The menus should have been set up with e_tasks_setup_view_menus().
 **/
void
e_tasks_discard_view_menus (ETasks *tasks)
{
    ETasksPrivate *priv;

    g_return_if_fail (tasks != NULL);
    g_return_if_fail (E_IS_TASKS (tasks));

    priv = tasks->priv;

    g_return_if_fail (priv->view_instance != NULL);

    g_assert (priv->view_instance != NULL);
    g_assert (priv->view_menus != NULL);

    g_object_unref (priv->view_instance);
    priv->view_instance = NULL;

    g_object_unref (priv->view_menus);
    priv->view_menus = NULL;
}

/**
 * e_tasks_get_calendar_table:
 * @tasks: A tasks widget.
 * 
 * Queries the #ECalendarTable contained in a tasks widget.
 * 
 * Return value: The #ECalendarTable that the tasks widget uses to display its
 * information.
 **/
ECalendarTable *
e_tasks_get_calendar_table (ETasks *tasks)
{
    ETasksPrivate *priv;

    g_return_val_if_fail (tasks != NULL, NULL);
    g_return_val_if_fail (E_IS_TASKS (tasks), NULL);

    priv = tasks->priv;
    return E_CALENDAR_TABLE (priv->tasks_view);
}