path: root/calendar/gui/gnome-cal.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* Evolution calendar - Main calendar view widget
 *
 * Copyright (C) 1998 The Free Software Foundation
 * Copyright (C) 2000 Ximian, Inc.
 * Copyright (C) 2001 Ximian, Inc.
 * Copyright (C) 2003 Novell, Inc
 *
 * Authors: Miguel de Icaza <miguel@ximian.com>
 *          Federico Mena-Quintero <federico@ximian.com>
 *          Seth Alves <alves@hungry.com>
 *          Rodrigo Moya <rodrigo@ximian.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#include <config.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <glib.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtkbindings.h>
#include <libgnome/gnome-i18n.h>
#include <libgnome/gnome-util.h>
#include <libgnomeui/gnome-dialog.h>
#include <libgnomeui/gnome-dialog-util.h>
#include <bonobo/bonobo-exception.h>
#include "e-util/e-url.h"
#include <libecal/e-cal-time-util.h>
#include "widgets/menus/gal-view-menus.h"
#include "e-comp-editor-registry.h"
#include "dialogs/delete-error.h"
#include "dialogs/event-editor.h"
#include "dialogs/task-editor.h"
#include "comp-util.h"
#include "e-cal-model-calendar.h"
#include "e-day-view.h"
#include "e-day-view-config.h"
#include "e-day-view-time-item.h"
#include "e-week-view.h"
#include "e-week-view-config.h"
#include "e-cal-list-view.h"
#include "e-cal-list-view-config.h"
#include "e-mini-calendar-config.h"
#include "e-calendar-table-config.h"
#include "evolution-calendar.h"
#include "gnome-cal.h"
#include "calendar-component.h"
#include "cal-search-bar.h"
#include "calendar-commands.h"
#include "calendar-config.h"
#include "calendar-view.h"
#include "calendar-view-factory.h"
#include "tag-calendar.h"
#include "misc.h"
#include "ea-calendar.h"



/* Private part of the GnomeCalendar structure */
struct _GnomeCalendarPrivate {
    /* The calendars for display */
    GHashTable *clients;
    GList *clients_list;
    
    /* Set of categories from the calendar client */
    /* FIXME are we getting all the categories? */
    GPtrArray *cal_categories;

    /*
     * The TaskPad Folder.
     */

    /* The calendar client object we monitor */
    ECal   *task_pad_client;

    /* Set of categories from the tasks client */
    GPtrArray *tasks_categories;

    /*
     * Fields for the calendar view
     */

    /* This is the last selection explicitly selected by the user. We try
       to keep it the same when we switch views, but we may have to alter
       it depending on the view (e.g. the week views only select days, so
       any times are lost. */
    time_t      selection_start_time;
    time_t      selection_end_time;

    /* Widgets */

    GtkWidget   *search_bar;

    GtkWidget   *hpane;
    GtkWidget   *notebook;
    GtkWidget   *vpane;

    ECalendar   *date_navigator;
    EMiniCalendarConfig *date_navigator_config; 
    GtkWidget   *todo;
    ECalendarTableConfig *todo_config;
    
    GtkWidget   *day_view;
    GtkWidget   *work_week_view;
    GtkWidget   *week_view;
    GtkWidget   *month_view;
    GtkWidget   *list_view;

    /* Calendar query for the date navigator */
    GList       *dn_queries; /* list of CalQueries */
    char        *sexp;
    guint        e_cal_view_timeout;
    
    /* This is the view currently shown. We use it to keep track of the
       positions of the panes. range_selected is TRUE if a range of dates
       was selected in the date navigator to show the view. */
    ECalendarView    *views[GNOME_CAL_LAST_VIEW];
    GObject    *configs[GNOME_CAL_LAST_VIEW];
    GnomeCalendarViewType current_view_type;
    GList *notifications;
    
    gboolean range_selected;

    /* These are the saved positions of the panes. They are multiples of
       calendar month widths & heights in the date navigator, so that they
       will work OK after theme changes. */
    gint         hpane_pos;
    gint         vpane_pos;
    gint         hpane_pos_month_view;
    gint         vpane_pos_month_view;

    /* The signal handler id for our GtkCalendar "day_selected" handler. */
    guint        day_selected_id;

    /* View instance and menus for the control */
    GalViewInstance *view_instance;
    GalViewMenus *view_menus;

    /* Our current timezone. */
    icaltimezone *zone;

    /* The dates currently shown. If they are -1 then we have no dates
       shown. We only use these to check if we need to emit a
       'dates-shown-changed' signal.*/
    time_t visible_start;
    time_t visible_end;
};

/* Signal IDs */

enum {
    DATES_SHOWN_CHANGED,
    CALENDAR_SELECTION_CHANGED,
    TASKPAD_SELECTION_CHANGED,
    CALENDAR_FOCUS_CHANGE,
    TASKPAD_FOCUS_CHANGE,
    GOTO_DATE,
    LAST_SIGNAL
};

/* Used to indicate who has the focus within the calendar view */
typedef enum {
    FOCUS_CALENDAR,
    FOCUS_TASKPAD,
    FOCUS_OTHER
} FocusLocation;

static guint gnome_calendar_signals[LAST_SIGNAL];




static void gnome_calendar_class_init (GnomeCalendarClass *class);
static void gnome_calendar_init (GnomeCalendar *gcal);
static void gnome_calendar_destroy (GtkObject *object);
static void gnome_calendar_goto_date (GnomeCalendar *gcal,
                      GnomeCalendarGotoDateType goto_date);

static void gnome_calendar_set_pane_positions   (GnomeCalendar  *gcal);
static void gnome_calendar_update_view_times (GnomeCalendar *gcal);
static void gnome_calendar_update_date_navigator (GnomeCalendar *gcal);

static void gnome_calendar_hpane_realized (GtkWidget *w, GnomeCalendar *gcal);
static void gnome_calendar_vpane_realized (GtkWidget *w, GnomeCalendar *gcal);
static gboolean gnome_calendar_vpane_resized (GtkWidget *w, GdkEventButton *e, GnomeCalendar *gcal);
static gboolean gnome_calendar_hpane_resized (GtkWidget *w, GdkEventButton *e, GnomeCalendar *gcal);

static void gnome_calendar_on_date_navigator_date_range_changed (ECalendarItem *calitem,
                                 GnomeCalendar *gcal);
static void gnome_calendar_on_date_navigator_selection_changed (ECalendarItem    *calitem,
                                GnomeCalendar    *gcal);
static void gnome_calendar_notify_dates_shown_changed (GnomeCalendar *gcal);

static void update_query (GnomeCalendar *gcal);


static GtkVBoxClass *parent_class;




E_MAKE_TYPE (gnome_calendar, "GnomeCalendar", GnomeCalendar, gnome_calendar_class_init,
         gnome_calendar_init, GTK_TYPE_VBOX);

/* Class initialization function for the gnome calendar */
static void
gnome_calendar_class_init (GnomeCalendarClass *class)
{
    GtkObjectClass *object_class;
    GtkBindingSet *binding_set;

    object_class = (GtkObjectClass *) class;

    parent_class = g_type_class_peek_parent (class);

    gnome_calendar_signals[DATES_SHOWN_CHANGED] =
        gtk_signal_new ("dates_shown_changed",
                GTK_RUN_LAST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (GnomeCalendarClass,
                           dates_shown_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    gnome_calendar_signals[CALENDAR_SELECTION_CHANGED] =
        gtk_signal_new ("calendar_selection_changed",
                GTK_RUN_LAST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (GnomeCalendarClass, calendar_selection_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    gnome_calendar_signals[TASKPAD_SELECTION_CHANGED] =
        gtk_signal_new ("taskpad_selection_changed",
                GTK_RUN_LAST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (GnomeCalendarClass, taskpad_selection_changed),
                gtk_marshal_NONE__NONE,
                GTK_TYPE_NONE, 0);

    gnome_calendar_signals[CALENDAR_FOCUS_CHANGE] =
        gtk_signal_new ("calendar_focus_change",
                GTK_RUN_FIRST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (GnomeCalendarClass, calendar_focus_change),
                gtk_marshal_NONE__BOOL,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_BOOL);

    gnome_calendar_signals[TASKPAD_FOCUS_CHANGE] =
        gtk_signal_new ("taskpad_focus_change",
                GTK_RUN_FIRST,
                G_TYPE_FROM_CLASS (object_class),
                GTK_SIGNAL_OFFSET (GnomeCalendarClass, taskpad_focus_change),
                gtk_marshal_NONE__BOOL,
                GTK_TYPE_NONE, 1,
                GTK_TYPE_BOOL);

    gnome_calendar_signals[GOTO_DATE] =
        g_signal_new ("goto_date",
                  G_TYPE_FROM_CLASS (object_class),
                  G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
                  G_STRUCT_OFFSET (GnomeCalendarClass, goto_date),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__ENUM,
                  G_TYPE_NONE,
                  1,
                  G_TYPE_INT);


    object_class->destroy = gnome_calendar_destroy;

    class->dates_shown_changed = NULL;
    class->calendar_selection_changed = NULL;
    class->taskpad_selection_changed = NULL;
    class->calendar_focus_change = NULL;
    class->taskpad_focus_change = NULL;
    class->goto_date = gnome_calendar_goto_date;

    /*
     * Key bindings
     */

    binding_set = gtk_binding_set_by_class (class);

    /* Alt+PageUp/PageDown, go to the first/last day of the month */
    gtk_binding_entry_add_signal (binding_set, GDK_Page_Up,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_FIRST_DAY_OF_MONTH);
    gtk_binding_entry_add_signal (binding_set, GDK_KP_Page_Up,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_FIRST_DAY_OF_MONTH);
    gtk_binding_entry_add_signal (binding_set, GDK_Page_Down,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_LAST_DAY_OF_MONTH);
    gtk_binding_entry_add_signal (binding_set, GDK_KP_Page_Down,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_LAST_DAY_OF_MONTH);

    /* Alt+Home/End, go to the first/last day of the week */
    gtk_binding_entry_add_signal (binding_set, GDK_Home,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_FIRST_DAY_OF_WEEK);
    gtk_binding_entry_add_signal (binding_set, GDK_End,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_LAST_DAY_OF_WEEK);
    gtk_binding_entry_add_signal (binding_set, GDK_KP_Home,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_FIRST_DAY_OF_WEEK);
    gtk_binding_entry_add_signal (binding_set, GDK_KP_End,
                      GDK_MOD1_MASK,
                      "goto_date", 1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_LAST_DAY_OF_WEEK);

    /*Alt+Left/Right, go to the same day of the previous/next week*/
    gtk_binding_entry_add_signal (binding_set,GDK_Left,
                      GDK_MOD1_MASK,
                      "goto_date",1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_SAME_DAY_OF_PREVIOUS_WEEK);
    gtk_binding_entry_add_signal (binding_set,GDK_KP_Left,
                      GDK_MOD1_MASK,
                      "goto_date",1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_SAME_DAY_OF_PREVIOUS_WEEK);
    gtk_binding_entry_add_signal (binding_set,GDK_Right,
                      GDK_MOD1_MASK,
                      "goto_date",1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_SAME_DAY_OF_NEXT_WEEK);
    gtk_binding_entry_add_signal (binding_set,GDK_KP_Right,
                      GDK_MOD1_MASK,
                      "goto_date",1,
                      G_TYPE_ENUM,
                      GNOME_CAL_GOTO_SAME_DAY_OF_NEXT_WEEK);
    /* init the accessibility support for gnome_calendar */
    gnome_calendar_a11y_init ();

}

/* Callback used when the calendar query reports of an updated object */
static void
dn_e_cal_view_objects_added_cb (ECalView *query, GList *objects, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    GList *l;
    
    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    for (l = objects; l; l = l->next) {
        ECalComponent *comp = NULL;

        comp = e_cal_component_new ();
        if (!e_cal_component_set_icalcomponent (comp, icalcomponent_new_clone (l->data))) {
            g_object_unref (comp);
            
            continue;
        }

        tag_calendar_by_comp (priv->date_navigator, comp, e_cal_view_get_client (query), NULL,
                      FALSE, TRUE);
        g_object_unref (comp);
    }
}

static void
dn_e_cal_view_objects_modified_cb (ECalView *query, GList *objects, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    /* We have to retag the whole thing: an event may change dates
     * and the tag_calendar_by_comp() below would not know how to
     * untag the old dates.
     */
    update_query (gcal);
}

/* Callback used when the calendar query reports of a removed object */
static void
dn_e_cal_view_objects_removed_cb (ECalView *query, GList *uids, gpointer data)
{
    GnomeCalendar *gcal;

    gcal = GNOME_CALENDAR (data);

    /* Just retag the whole thing */
    update_query (gcal);
}

/* Callback used when the calendar query is done */
static void
dn_e_cal_view_done_cb (ECalView *query, ECalendarStatus status, gpointer data)
{
    GnomeCalendar *gcal;

    gcal = GNOME_CALENDAR (data);

    /* FIXME Better error reporting */
    if (status != E_CALENDAR_STATUS_OK)
        g_warning (G_STRLOC ": Query did not successfully complete");
}

/* Returns the current view widget, an EDayView, EWeekView or ECalListView. */
GtkWidget*
gnome_calendar_get_current_view_widget (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    return GTK_WIDGET (priv->views[priv->current_view_type]);
}

/* Gets the focus location based on who is the focused widget within the
 * calendar view.
 */
static FocusLocation
get_focus_location (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    ETable *etable;

    priv = gcal->priv;

    etable = e_calendar_table_get_table (E_CALENDAR_TABLE (priv->todo));

    if (GTK_WIDGET_HAS_FOCUS (etable->table_canvas))
        return FOCUS_TASKPAD;
    else {
        GtkWidget *widget;
        EDayView *dv;
        EWeekView *wv;
        ECalListView *lv;

        widget = gnome_calendar_get_current_view_widget (gcal);

        switch (priv->current_view_type) {
        case GNOME_CAL_DAY_VIEW:
        case GNOME_CAL_WORK_WEEK_VIEW:
            dv = E_DAY_VIEW (widget);

            if (GTK_WIDGET_HAS_FOCUS (dv->top_canvas)
                || GTK_WIDGET_HAS_FOCUS (dv->main_canvas))
                return FOCUS_CALENDAR;
            else
                return FOCUS_OTHER;

        case GNOME_CAL_WEEK_VIEW:
        case GNOME_CAL_MONTH_VIEW:
            wv = E_WEEK_VIEW (widget);

            if (GTK_WIDGET_HAS_FOCUS (wv->main_canvas))
                return FOCUS_CALENDAR;
            else
                return FOCUS_OTHER;

        case GNOME_CAL_LIST_VIEW:
            lv = E_CAL_LIST_VIEW (widget);

            if (GTK_WIDGET_HAS_FOCUS (e_table_scrolled_get_table (lv->table_scrolled)))
                return FOCUS_CALENDAR;
            else
                return FOCUS_OTHER;

        default:
            g_assert_not_reached ();
            return FOCUS_OTHER;
        }
    }
}

/* Computes the range of time that the date navigator is showing */
static void
get_date_navigator_range (GnomeCalendar *gcal, time_t *start_time, time_t *end_time)
{
    GnomeCalendarPrivate *priv;
    gint start_year, start_month, start_day;
    gint end_year, end_month, end_day;
    struct icaltimetype start_tt;
    struct icaltimetype end_tt;

    priv = gcal->priv;

    start_tt = icaltime_null_time ();
    end_tt = icaltime_null_time ();

    if (!e_calendar_item_get_date_range (priv->date_navigator->calitem,
                         &start_year, &start_month, &start_day,
                         &end_year, &end_month, &end_day)) {
        *start_time = -1;
        *end_time = -1;
        return;
    }

    start_tt.year = start_year;
    start_tt.month = start_month + 1;
    start_tt.day = start_day;

    end_tt.year = end_year;
    end_tt.month = end_month + 1;
    end_tt.day = end_day;

    icaltime_adjust (&end_tt, 1, 0, 0, 0);

    *start_time = icaltime_as_timet_with_zone (start_tt, priv->zone);
    *end_time = icaltime_as_timet_with_zone (end_tt, priv->zone);
}

/* Adjusts a given query sexp with the time range of the date navigator */
static char *
adjust_e_cal_view_sexp (GnomeCalendar *gcal, const char *sexp)
{
    time_t start_time, end_time;
    char *start, *end;
    char *new_sexp;

    get_date_navigator_range (gcal, &start_time, &end_time);
    if (start_time == -1 || end_time == -1)
        return NULL;

    start = isodate_from_time_t (start_time);
    end = isodate_from_time_t (end_time);

    new_sexp = g_strdup_printf ("(and (occur-in-time-range? (make-time \"%s\")"
                    "                           (make-time \"%s\"))"
                    "     %s)",
                    start, end,
                    sexp);


    g_free (start);
    g_free (end);

    return new_sexp;
}

/* Restarts a query for the date navigator in the calendar */
static void
update_query (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    ECalView *old_query;
    char *real_sexp;
    GList *l;

    priv = gcal->priv;

    e_calendar_item_clear_marks (priv->date_navigator->calitem);

    e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), _("Searching"));

    /* free the previous queries */
    for (l = priv->dn_queries; l != NULL; l = l->next) {
        old_query = l->data;

        if (old_query) {
            g_signal_handlers_disconnect_matched (old_query, G_SIGNAL_MATCH_DATA,
                                  0, 0, NULL, NULL, gcal);
            g_object_unref (old_query);
        }
    }

    g_list_free (priv->dn_queries);
    priv->dn_queries = NULL;

    g_assert (priv->sexp != NULL);

    real_sexp = adjust_e_cal_view_sexp (gcal, priv->sexp);
    if (!real_sexp) {
        e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), NULL);
        return; /* No time range is set, so don't start a query */
    }

    /* create queries for each loaded client */
    for (l = priv->clients_list; l != NULL; l = l->next) {
        if (!e_cal_get_query ((ECal *) l->data, real_sexp, &old_query, NULL)) {
            g_warning (G_STRLOC ": Could not create the query");

            continue;
        }

        g_signal_connect (old_query, "objects_added",
                  G_CALLBACK (dn_e_cal_view_objects_added_cb), gcal);
        g_signal_connect (old_query, "objects_modified",
                  G_CALLBACK (dn_e_cal_view_objects_modified_cb), gcal);
        g_signal_connect (old_query, "objects_removed",
                  G_CALLBACK (dn_e_cal_view_objects_removed_cb), gcal);
        g_signal_connect (old_query, "view_done",
                  G_CALLBACK (dn_e_cal_view_done_cb), gcal);

        priv->dn_queries = g_list_append (priv->dn_queries, old_query);

        e_cal_view_start (old_query);
    }

    g_free (real_sexp);

    e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), NULL);
}

static void
adjust_e_cal_view_for_view (ECalendarView *cal_view, const char *sexp)
{
    char *real_sexp, *start, *end;
    time_t ttstart, ttend;

    e_calendar_view_get_visible_time_range (cal_view, &ttstart, &ttend);

    start = isodate_from_time_t (ttstart);
    end = isodate_from_time_t (ttend);

    real_sexp = g_strdup_printf (
        "(and (occur-in-time-range? (make-time \"%s\")"
        "                           (make-time \"%s\"))"
        " %s)",
        start, end, sexp);

    e_cal_model_set_query (e_calendar_view_get_model (cal_view), real_sexp);

    g_free (start);
    g_free (end);
    g_free (real_sexp);
}

/**
 * gnome_calendar_set_query:
 * @gcal: A calendar.
 * @sexp: Sexp that defines the query.
 * 
 * Sets the query sexp for all the views in a calendar.
 **/
void
gnome_calendar_set_query (GnomeCalendar *gcal, const char *sexp)
{
    GnomeCalendarPrivate *priv;
    ECalModel *model;
    int i;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (sexp != NULL);

    priv = gcal->priv;

    /* Set the query on the date navigator */

    if (priv->sexp)
        g_free (priv->sexp);

    priv->sexp = g_strdup (sexp);

    update_query (gcal);

    /* Set the query on the views */
    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++)
        adjust_e_cal_view_for_view (E_CALENDAR_VIEW (priv->views[i]), sexp);

    /* Set the query on the task pad */
    model = e_calendar_table_get_model (E_CALENDAR_TABLE (priv->todo));
    e_cal_model_set_query (model, sexp);
}

/* Returns the current time, for the ECalendarItem. */
static struct tm
get_current_time (ECalendarItem *calitem, gpointer data)
{
    GnomeCalendar *cal = data;
    struct tm tmp_tm = { 0 };
    struct icaltimetype tt;

    g_return_val_if_fail (cal != NULL, tmp_tm);
    g_return_val_if_fail (GNOME_IS_CALENDAR (cal), tmp_tm);

    tt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                        cal->priv->zone);

    /* Now copy it to the struct tm and return it. */
    tmp_tm = icaltimetype_to_tm (&tt);

    return tmp_tm;
}

/* Callback used when the sexp changes in the calendar search bar */
static void
search_bar_sexp_changed_cb (CalSearchBar *cal_search, const char *sexp, gpointer data)
{
    GnomeCalendar *gcal;

    gcal = GNOME_CALENDAR (data);
    gnome_calendar_set_query (gcal, 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)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    ECalModel *model;
    int i;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
        e_calendar_view_set_default_category (E_CALENDAR_VIEW (priv->views[i]),
                         category);
    }

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

static void
view_selection_changed_cb (GtkWidget *view, GnomeCalendar *gcal)
{
    gtk_signal_emit (GTK_OBJECT (gcal),
             gnome_calendar_signals[CALENDAR_SELECTION_CHANGED]);
}


/* Callback used when the taskpad receives a focus event.  We emit the
 * corresponding signal so that parents can change the menus as appropriate.
 */
static gint
table_canvas_focus_change_cb (GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    GnomeCalendar *gcal;

    gcal = GNOME_CALENDAR (data);

    gtk_signal_emit (GTK_OBJECT (gcal), gnome_calendar_signals [TASKPAD_FOCUS_CHANGE],
             event->in ? TRUE : FALSE);

    return FALSE;
}

static gint
calendar_focus_change_cb (GtkWidget *widget, GdkEventFocus *event, gpointer data)
{
    GnomeCalendar *gcal;

    gcal = GNOME_CALENDAR (data);

    gtk_signal_emit (GTK_OBJECT (gcal), gnome_calendar_signals [CALENDAR_FOCUS_CHANGE],
             event->in ? TRUE : FALSE);

    return FALSE;
}

/* Connects to the focus change signals of a day view widget */
static void
connect_day_view_focus (GnomeCalendar *gcal, EDayView *dv)
{
    g_signal_connect (dv->top_canvas, "focus_in_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
    g_signal_connect (dv->top_canvas, "focus_out_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);

    g_signal_connect (dv->main_canvas, "focus_in_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
    g_signal_connect (dv->main_canvas, "focus_out_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
}

/* Connects to the focus change signals of a week view widget */
static void
connect_week_view_focus (GnomeCalendar *gcal, EWeekView *wv)
{
    g_signal_connect (wv->main_canvas, "focus_in_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
    g_signal_connect (wv->main_canvas, "focus_out_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
}

static void
connect_list_view_focus (GnomeCalendar *gcal, ECalListView *lv)
{
    g_signal_connect (lv, "focus_in_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
    g_signal_connect (lv, "focus_out_event",
              G_CALLBACK (calendar_focus_change_cb), gcal);
}

/* Callback used when the selection in the taskpad table changes.  We just proxy
 * the signal with our own one.
 */
static void
table_selection_change_cb (ETable *etable, gpointer data)
{
    GnomeCalendar *gcal;
    int n_selected;

    gcal = GNOME_CALENDAR (data);

    n_selected = e_table_selected_count (etable);
    gtk_signal_emit (GTK_OBJECT (gcal), gnome_calendar_signals[TASKPAD_SELECTION_CHANGED]);
}

static void
set_timezone (GnomeCalendar *calendar) 
{
    GnomeCalendarPrivate *priv;
    char *location;
    GList *l;

    priv = calendar->priv;
    
    location = calendar_config_get_timezone ();
    priv->zone = icaltimezone_get_builtin_timezone (location);
    g_free (location);
    
    if (!priv->zone)
        priv->zone = icaltimezone_get_utc_timezone ();

    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, priv->zone, NULL);
    }
    
    if (priv->task_pad_client
        && e_cal_get_load_state (priv->task_pad_client) == E_CAL_LOAD_LOADED) {
        /* FIXME Error Checking */
        e_cal_set_default_timezone (priv->task_pad_client,
                         priv->zone, NULL);
    }
}

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

static void
setup_config (GnomeCalendar *calendar)
{
    GnomeCalendarPrivate *priv;
    guint not;

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

    /* Pane positions */
    priv->hpane_pos = calendar_config_get_hpane_pos ();
    priv->vpane_pos = calendar_config_get_vpane_pos ();
    priv->hpane_pos_month_view = calendar_config_get_month_hpane_pos ();
    priv->vpane_pos_month_view = calendar_config_get_month_vpane_pos ();
}

static void
setup_widgets (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GtkWidget *w;
    gchar *filename;
    ETable *etable;
    int i;
    
    priv = gcal->priv;

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

    gtk_widget_show (priv->search_bar);
    gtk_box_pack_start (GTK_BOX (gcal), priv->search_bar, FALSE, FALSE, 6);

    /* The main HPaned, with the notebook of calendar views on the left
       and the ECalendar and ToDo list on the right. */
    priv->hpane = gtk_hpaned_new ();
    g_signal_connect_after(priv->hpane, "realize", 
                   G_CALLBACK(gnome_calendar_hpane_realized), gcal);
    g_signal_connect (priv->hpane, "button_release_event",
              G_CALLBACK (gnome_calendar_hpane_resized), gcal);
    gtk_widget_show (priv->hpane);
    gtk_box_pack_start (GTK_BOX (gcal), priv->hpane, TRUE, TRUE, 6);

    /* The Notebook containing the 4 calendar views. */
    priv->notebook = gtk_notebook_new ();
    gtk_notebook_set_show_border (GTK_NOTEBOOK (priv->notebook), FALSE);
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (priv->notebook), FALSE);
    gtk_widget_show (priv->notebook);
    gtk_paned_pack1 (GTK_PANED (priv->hpane), priv->notebook, FALSE, TRUE);

    /* The VPaned widget, to contain the GtkCalendar & ToDo list. */
    priv->vpane = gtk_vpaned_new ();
    g_signal_connect_after (priv->vpane, "realize",
                G_CALLBACK(gnome_calendar_vpane_realized), gcal);
    g_signal_connect (priv->vpane, "button_release_event",
              G_CALLBACK (gnome_calendar_vpane_resized), gcal);
    gtk_widget_show (priv->vpane);
    gtk_paned_pack2 (GTK_PANED (priv->hpane), priv->vpane, TRUE, TRUE);

    /* The ECalendar. */
    w = e_calendar_new ();
    priv->date_navigator = E_CALENDAR (w);
    priv->date_navigator_config = e_mini_calendar_config_new (priv->date_navigator);
    e_calendar_item_set_days_start_week_sel (priv->date_navigator->calitem, 9);
    e_calendar_item_set_max_days_sel (priv->date_navigator->calitem, 42);
    gtk_widget_show (w);
    e_calendar_item_set_get_time_callback (priv->date_navigator->calitem,
                           (ECalendarItemGetTimeCallback) get_current_time,
                           gcal, NULL);

    gtk_paned_pack1 (GTK_PANED (priv->vpane), w, FALSE, TRUE);  

    g_signal_connect (priv->date_navigator->calitem, "selection_changed",
              G_CALLBACK (gnome_calendar_on_date_navigator_selection_changed), gcal);
    g_signal_connect (priv->date_navigator->calitem, "date_range_changed",
              G_CALLBACK (gnome_calendar_on_date_navigator_date_range_changed), gcal);

    /* The ToDo list. */
    priv->todo = e_calendar_table_new ();
    priv->todo_config = e_calendar_table_config_new (E_CALENDAR_TABLE (priv->todo));
    gtk_paned_pack2 (GTK_PANED (priv->vpane), priv->todo, TRUE, TRUE);
    gtk_widget_show (priv->todo);

    filename = g_build_filename (calendar_component_peek_config_directory (calendar_component_peek ()),
                     "TaskPad", NULL);
    e_calendar_table_load_state (E_CALENDAR_TABLE (priv->todo), filename);
    g_free (filename);

    etable = e_calendar_table_get_table (E_CALENDAR_TABLE (priv->todo));
    g_signal_connect (etable->table_canvas, "focus_in_event",
              G_CALLBACK (table_canvas_focus_change_cb), gcal);
    g_signal_connect (etable->table_canvas, "focus_out_event",
              G_CALLBACK (table_canvas_focus_change_cb), gcal);

    g_signal_connect (etable, "selection_change",
              G_CALLBACK (table_selection_change_cb), gcal);

    /* The Day View. */
    priv->day_view = e_day_view_new ();
    g_signal_connect (priv->day_view, "selection_changed",
              G_CALLBACK (view_selection_changed_cb), gcal);

    connect_day_view_focus (gcal, E_DAY_VIEW (priv->day_view));

    /* The Work Week View. */
    priv->work_week_view = e_day_view_new ();
    e_day_view_set_work_week_view (E_DAY_VIEW (priv->work_week_view),
                       TRUE);
    e_day_view_set_days_shown (E_DAY_VIEW (priv->work_week_view), 5);
    e_calendar_view_set_calendar (E_CALENDAR_VIEW (priv->work_week_view), gcal);

    connect_day_view_focus (gcal, E_DAY_VIEW (priv->work_week_view));

    /* The Week View. */
    priv->week_view = e_week_view_new ();
    e_calendar_view_set_calendar (E_CALENDAR_VIEW (priv->week_view), gcal);
    g_signal_connect (priv->week_view, "selection_changed",
              G_CALLBACK (view_selection_changed_cb), gcal);

    connect_week_view_focus (gcal, E_WEEK_VIEW (priv->week_view));

    /* The Month View. */
    priv->month_view = e_week_view_new ();
    e_calendar_view_set_calendar (E_CALENDAR_VIEW (priv->month_view), gcal);
    e_week_view_set_multi_week_view (E_WEEK_VIEW (priv->month_view), TRUE);
    g_signal_connect (priv->month_view, "selection_changed",
              G_CALLBACK (view_selection_changed_cb), gcal);

    connect_week_view_focus (gcal, E_WEEK_VIEW (priv->month_view));

    /* The List View. */
    filename = g_strdup_printf (".evolution/config/CalListView");
    priv->list_view = e_cal_list_view_new (filename);
    g_free (filename);

    e_calendar_view_set_calendar (E_CALENDAR_VIEW (priv->list_view), gcal);

    connect_list_view_focus (gcal, E_CAL_LIST_VIEW (priv->list_view));

    priv->views[GNOME_CAL_DAY_VIEW] = E_CALENDAR_VIEW (priv->day_view);
    priv->configs[GNOME_CAL_DAY_VIEW] = e_day_view_config_new (E_DAY_VIEW (priv->views[GNOME_CAL_DAY_VIEW]));
    priv->views[GNOME_CAL_WORK_WEEK_VIEW] = E_CALENDAR_VIEW (priv->work_week_view);
    priv->configs[GNOME_CAL_WORK_WEEK_VIEW] = e_day_view_config_new (E_DAY_VIEW (priv->views[GNOME_CAL_WORK_WEEK_VIEW]));
    priv->views[GNOME_CAL_WEEK_VIEW] = E_CALENDAR_VIEW (priv->week_view);
    priv->configs[GNOME_CAL_WEEK_VIEW] = e_week_view_config_new (E_WEEK_VIEW (priv->views[GNOME_CAL_WEEK_VIEW]));
    priv->views[GNOME_CAL_MONTH_VIEW] = E_CALENDAR_VIEW (priv->month_view);
    priv->configs[GNOME_CAL_MONTH_VIEW] = e_week_view_config_new (E_WEEK_VIEW (priv->views[GNOME_CAL_MONTH_VIEW]));
    priv->views[GNOME_CAL_LIST_VIEW] = E_CALENDAR_VIEW (priv->list_view);
    priv->configs[GNOME_CAL_MONTH_VIEW] = e_cal_list_view_config_new (E_CAL_LIST_VIEW (priv->views[GNOME_CAL_LIST_VIEW]));
    priv->configs[GNOME_CAL_LIST_VIEW] = NULL;  

    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
        gtk_notebook_append_page (GTK_NOTEBOOK (priv->notebook),
                      GTK_WIDGET (priv->views[i]), gtk_label_new (""));

        gtk_widget_show (GTK_WIDGET (priv->views[i]));
    }
}

/* Object initialization function for the gnome calendar */
static void
gnome_calendar_init (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = g_new0 (GnomeCalendarPrivate, 1);
    gcal->priv = priv;

    priv->clients = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
    
    priv->cal_categories = NULL;
    priv->tasks_categories = NULL;

    priv->current_view_type = GNOME_CAL_DAY_VIEW;
    priv->range_selected = FALSE;

    setup_config (gcal);
    setup_widgets (gcal);

    priv->dn_queries = NULL;
    priv->sexp = g_strdup ("#t"); /* Match all */

    priv->selection_start_time = time_day_begin_with_zone (time (NULL),
                                   priv->zone);
    priv->selection_end_time = time_add_day_with_zone (priv->selection_start_time, 1, priv->zone);

    priv->view_instance = NULL;
    priv->view_menus = NULL;

    priv->visible_start = -1;
    priv->visible_end = -1;
}

/* Frees a set of categories */
static void
free_categories (GPtrArray *categories)
{
    int i;

    if (!categories)
        return;

    for (i = 0; i < categories->len; i++)
        g_free (categories->pdata[i]);

    g_ptr_array_free (categories, TRUE);
}

static void
gnome_calendar_destroy (GtkObject *object)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    gchar *filename;

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

    gcal = GNOME_CALENDAR (object);
    priv = gcal->priv;

    if (priv) {
        GList *l;
        int i;
        
        /* 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, gcal);
        }

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

        free_categories (priv->cal_categories);
        priv->cal_categories = NULL;

        free_categories (priv->tasks_categories);
        priv->tasks_categories = NULL;

        for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
            if (priv->configs[i])
                g_object_unref (priv->configs[i]);
            priv->configs[i] = NULL;
        }
        g_object_unref (priv->date_navigator_config);
        g_object_unref (priv->todo_config);
        
        for (l = priv->notifications; l; l = l->next)
            calendar_config_remove_notification (GPOINTER_TO_UINT (l->data));
        priv->notifications = NULL;
        
        /* Save the TaskPad layout. */
        filename = g_build_filename (calendar_component_peek_config_directory (calendar_component_peek ()),
                         "TaskPad", NULL);
        e_calendar_table_save_state (E_CALENDAR_TABLE (priv->todo), filename);
        g_free (filename);

        if (priv->dn_queries) {
            for (l = priv->dn_queries; l != NULL; l = l->next) {
                g_signal_handlers_disconnect_matched ((ECalView *) l->data, G_SIGNAL_MATCH_DATA,
                                      0, 0, NULL, NULL, gcal);
                g_object_unref (l->data);
            }

            g_list_free (priv->dn_queries);
            priv->dn_queries = NULL;
        }

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

        if (priv->e_cal_view_timeout) {
            g_source_remove (priv->e_cal_view_timeout);
            priv->e_cal_view_timeout = 0;
        }

        if (priv->task_pad_client) {
            g_signal_handlers_disconnect_matched (priv->task_pad_client, G_SIGNAL_MATCH_DATA,
                                  0, 0, NULL, NULL, gcal);
            g_object_unref (priv->task_pad_client);
            priv->task_pad_client = NULL;
        }

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

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

        g_free (priv);
        gcal->priv = NULL;
    }
    
    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void
gnome_calendar_goto_date (GnomeCalendar *gcal,
              GnomeCalendarGotoDateType goto_date)
{
    GnomeCalendarPrivate *priv;
    time_t   start_time;
    time_t   end_time;
    gboolean need_updating = FALSE;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR(gcal));

    priv = gcal->priv;

    gnome_calendar_get_current_time_range (gcal, &start_time, &end_time);

    switch (goto_date) {
        /* GNOME_CAL_GOTO_TODAY and GNOME_CAL_GOTO_DATE are
           currently not used
        */
    case GNOME_CAL_GOTO_TODAY:
        break;
    case GNOME_CAL_GOTO_DATE:
        break;
    case GNOME_CAL_GOTO_FIRST_DAY_OF_MONTH:
        priv->selection_start_time =
            time_month_begin_with_zone (start_time, priv->zone);
        priv->selection_end_time =
            time_add_day_with_zone (priv->selection_start_time,
                        1, priv->zone);
        need_updating = TRUE;
        break;
    case GNOME_CAL_GOTO_LAST_DAY_OF_MONTH:
        start_time = time_add_month_with_zone (start_time, 1,
                               priv->zone);
        priv->selection_end_time =
            time_month_begin_with_zone (start_time, priv->zone);
        priv->selection_start_time =
            time_add_day_with_zone (priv->selection_end_time,
                        -1, priv->zone);
        need_updating = TRUE;
        break;
    case GNOME_CAL_GOTO_FIRST_DAY_OF_WEEK:
        /* 1 for Monday */
        priv->selection_start_time =
            time_week_begin_with_zone (start_time, 1, priv->zone);
        priv->selection_end_time =
            time_add_day_with_zone (priv->selection_start_time,
                        1, priv->zone);
        need_updating = TRUE;
        break;
    case GNOME_CAL_GOTO_LAST_DAY_OF_WEEK:
        /* 1 for Monday */
        start_time = time_week_begin_with_zone (start_time, 1,
                            priv->zone);
        if (priv->current_view_type == GNOME_CAL_DAY_VIEW ||
            priv->current_view_type == GNOME_CAL_WORK_WEEK_VIEW) {
            /* goto Friday of this week */
            priv->selection_start_time =
                time_add_day_with_zone (start_time,
                            4, priv->zone);
        }
        else {
            /* goto Sunday of this week */
            priv->selection_start_time =
                time_add_day_with_zone (start_time,
                            6, priv->zone);
        }
        priv->selection_end_time =
            time_add_day_with_zone (priv->selection_start_time,
                        1, priv->zone);
        need_updating = TRUE;
        break;
    case GNOME_CAL_GOTO_SAME_DAY_OF_PREVIOUS_WEEK:
        priv->selection_start_time = time_add_day_with_zone (start_time,
                                     -7, priv->zone);
        priv->selection_end_time = time_add_day_with_zone (end_time,
                                   -7,priv->zone);
        need_updating = TRUE;
        break;
    case GNOME_CAL_GOTO_SAME_DAY_OF_NEXT_WEEK:
        priv->selection_start_time = time_add_day_with_zone (start_time,
                                     7, priv->zone);
        priv->selection_end_time = time_add_day_with_zone (end_time,
                                   7,priv->zone);
        need_updating = TRUE;
        break;

    default:
        break;
    }

    if (need_updating) {
        gnome_calendar_update_view_times (gcal);
        gnome_calendar_update_date_navigator (gcal);
        gnome_calendar_notify_dates_shown_changed (gcal);
    }
}

void
gnome_calendar_goto (GnomeCalendar *gcal, time_t new_time)
{
    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (new_time != -1);

    priv = gcal->priv;

    priv->selection_start_time = time_day_begin_with_zone (new_time,
                                   priv->zone);
    priv->selection_end_time = time_add_day_with_zone (priv->selection_start_time, 1, priv->zone);

    gnome_calendar_update_view_times (gcal);
    gnome_calendar_update_date_navigator (gcal);
    gnome_calendar_notify_dates_shown_changed (gcal);
}


static void
gnome_calendar_update_view_times (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    e_calendar_view_set_selected_time_range (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)),
                        priv->selection_start_time,
                        priv->selection_end_time);
}

static void
gnome_calendar_direction (GnomeCalendar *gcal, int direction)
{
    GnomeCalendarPrivate *priv;
    time_t start_time, end_time;

    priv = gcal->priv;

    start_time = priv->selection_start_time;
    end_time = priv->selection_end_time;

    switch (priv->current_view_type) {
    case GNOME_CAL_DAY_VIEW:
        start_time = time_add_day_with_zone (start_time, direction,
                             priv->zone);
        end_time = time_add_day_with_zone (end_time, direction,
                           priv->zone);
        break;

    case GNOME_CAL_WORK_WEEK_VIEW:
    case GNOME_CAL_WEEK_VIEW:
        start_time = time_add_week_with_zone (start_time, direction,
                              priv->zone);
        end_time = time_add_week_with_zone (end_time, direction,
                            priv->zone);
        break;

    case GNOME_CAL_LIST_VIEW:
        g_warning ("Using month view time interval for list view.");
    case GNOME_CAL_MONTH_VIEW:
        start_time = time_add_month_with_zone (start_time, direction,
                               priv->zone);
        end_time = time_add_month_with_zone (end_time, direction,
                             priv->zone);
        break;

    default:
        g_warning ("Weee!  Where did the penguin go?");
        g_assert_not_reached ();
        return;
    }

    priv->selection_start_time = start_time;
    priv->selection_end_time = end_time;

    gnome_calendar_update_view_times (gcal);
    gnome_calendar_update_date_navigator (gcal);
    gnome_calendar_notify_dates_shown_changed (gcal);
}

void
gnome_calendar_next (GnomeCalendar *gcal)
{
    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    gnome_calendar_direction (gcal, 1);
}

void
gnome_calendar_previous (GnomeCalendar *gcal)
{
    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    gnome_calendar_direction (gcal, -1);
}

void
gnome_calendar_dayjump (GnomeCalendar *gcal, time_t time)
{
    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    priv->selection_start_time = time_day_begin_with_zone (time,
                                   priv->zone);
    priv->selection_end_time = time_add_day_with_zone (priv->selection_start_time, 1, priv->zone);

    gnome_calendar_set_view (gcal, GNOME_CAL_DAY_VIEW, FALSE, TRUE);
}

static void
focus_current_view (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    gtk_widget_grab_focus (gnome_calendar_get_current_view_widget (gcal));
}

void
gnome_calendar_goto_today (GnomeCalendar *gcal)
{
    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    gnome_calendar_goto (gcal, time (NULL));
    focus_current_view (gcal);
}

/**
 * gnome_calendar_get_view:
 * @gcal: A calendar.
 *
 * Queries the type of the view that is being shown in a calendar.
 *
 * Return value: Type of the view that is currently shown.
 **/
GnomeCalendarViewType
gnome_calendar_get_view (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    g_return_val_if_fail (gcal != NULL, GNOME_CAL_DAY_VIEW);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), GNOME_CAL_DAY_VIEW);

    priv = gcal->priv;
    return priv->current_view_type;
}

/* Sets the view without changing the selection or updating the date
 * navigator. If a range of dates isn't selected it will also reset the number
 * of days/weeks shown to the default (i.e. 1 day for the day view or 5 weeks
 * for the month view).
 */
static void
set_view (GnomeCalendar *gcal, GnomeCalendarViewType view_type,
      gboolean range_selected, gboolean grab_focus)
{
    GnomeCalendarPrivate *priv;
    gboolean round_selection;
    const char *view_id;
    static gboolean updating = FALSE;

    if (updating)
        return;

    priv = gcal->priv;

    round_selection = FALSE;

    switch (view_type) {
    case GNOME_CAL_DAY_VIEW:
        view_id = "Day_View";
        
        if (!range_selected)
            e_day_view_set_days_shown (E_DAY_VIEW (priv->day_view), 1);

        break;

    case GNOME_CAL_WORK_WEEK_VIEW:
        view_id = "Work_Week_View";
        break;

    case GNOME_CAL_WEEK_VIEW:
        view_id = "Week_View";
        round_selection = TRUE;
        break;

    case GNOME_CAL_MONTH_VIEW:
        view_id = "Month_View";

        if (!range_selected)
            e_week_view_set_weeks_shown (E_WEEK_VIEW (priv->month_view), 5);

        round_selection = TRUE;
        break;

    case GNOME_CAL_LIST_VIEW:
        view_id = "List_View";
        break;

    default:
        g_warning ("A penguin is loose!");
        g_assert_not_reached ();
        return;
    }

    priv->current_view_type = view_type;
    priv->range_selected = range_selected;

    calendar_config_set_default_view (view_type);

    updating = TRUE;
    gtk_notebook_set_page (GTK_NOTEBOOK (priv->notebook), (int) view_type);
    if (priv->view_instance)
        gal_view_instance_set_current_view_id (priv->view_instance, view_id);
    updating = FALSE;

    if (grab_focus)
        gtk_widget_grab_focus (GTK_WIDGET (priv->views[view_type]));

    gnome_calendar_set_pane_positions (gcal);

    /* For the week & month views we want the selection in the date
       navigator to be rounded to the nearest week when the arrow buttons
       are pressed to move to the previous/next month. */
    g_object_set (G_OBJECT (priv->date_navigator->calitem),
              "round_selection_when_moving", round_selection,
              NULL);
}

/**
 * gnome_calendar_set_view:
 * @gcal: A calendar.
 * @view_type: Type of view to show.
 * @range_selected: If false, the range of days/weeks shown will be reset to the
 * default value (1 for day view, 5 for week view, respectively).  If true, the
 * currently displayed range will be kept.
 * @grab_focus: Whether the view widget should grab the focus.
 *
 * Sets the view that should be shown in a calendar.  If @reset_range is true,
 * this function will automatically set the number of days or weeks shown in
 * the view; otherwise the last configuration will be kept.
 **/
void
gnome_calendar_set_view (GnomeCalendar *gcal, GnomeCalendarViewType view_type,
             gboolean range_selected, gboolean grab_focus)
{
    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    set_view (gcal, view_type, range_selected, grab_focus);
    gnome_calendar_update_view_times (gcal);
    gnome_calendar_update_date_navigator (gcal);
    gnome_calendar_notify_dates_shown_changed (gcal);
}

/* Callback used when the view collection asks us to display a particular view */
static void
display_view_cb (GalViewInstance *view_instance, GalView *view, gpointer data)
{
    GnomeCalendar *gcal;
    CalendarView *cal_view;

    gcal = GNOME_CALENDAR (data);

    if (!IS_CALENDAR_VIEW (view))
        g_error ("display_view_cb(): Unknown type of view for GnomeCalendar");

    cal_view = CALENDAR_VIEW (view);

    gnome_calendar_set_view (gcal, calendar_view_get_view_type (cal_view), FALSE, TRUE);
}

/**
 * gnome_calendar_setup_view_menus:
 * @gcal: A calendar.
 * @uic: UI controller to use for the menus.
 * 
 * Sets up the #GalView menus for a calendar.  This function should be called
 * from the Bonobo control activation callback for this calendar.  Also, the
 * menus should be discarded using gnome_calendar_discard_view_menus().
 **/
void
gnome_calendar_setup_view_menus (GnomeCalendar *gcal, BonoboUIComponent *uic)
{
    GnomeCalendarPrivate *priv;
    char *path;
    CalendarViewFactory *factory;
    static GalViewCollection *collection = NULL;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (uic != NULL);
    g_return_if_fail (BONOBO_IS_UI_COMPONENT (uic));

    priv = gcal->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, _("Calendar"));

        path = gnome_util_prepend_user_home ("/evolution/views/calendar/");
        gal_view_collection_set_storage_directories (collection,
                                 EVOLUTION_GALVIEWSDIR "/calendar/",
                                 path);
        g_free (path);

        /* Create the views */

        factory = calendar_view_factory_new (GNOME_CAL_DAY_VIEW);
        gal_view_collection_add_factory (collection, GAL_VIEW_FACTORY (factory));
        g_object_unref (factory);

        factory = calendar_view_factory_new (GNOME_CAL_WORK_WEEK_VIEW);
        gal_view_collection_add_factory (collection, GAL_VIEW_FACTORY (factory));
        g_object_unref (factory);

        factory = calendar_view_factory_new (GNOME_CAL_WEEK_VIEW);
        gal_view_collection_add_factory (collection, GAL_VIEW_FACTORY (factory));
        g_object_unref (factory);

        factory = calendar_view_factory_new (GNOME_CAL_MONTH_VIEW);
        gal_view_collection_add_factory (collection, GAL_VIEW_FACTORY (factory));
        g_object_unref (factory);

        factory = calendar_view_factory_new (GNOME_CAL_LIST_VIEW);
        gal_view_collection_add_factory (collection, GAL_VIEW_FACTORY (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 (gnome_calendar_get_default_client (gcal)));

    priv->view_menus = gal_view_menus_new (priv->view_instance);
    gal_view_menus_set_show_define_views (priv->view_menus, FALSE);
    gal_view_menus_apply (priv->view_menus, uic, NULL);
    gnome_calendar_set_view (gcal, priv->current_view_type, TRUE, FALSE);

    g_signal_connect (priv->view_instance, "display_view",
              G_CALLBACK (display_view_cb), gcal);
    display_view_cb (priv->view_instance, gal_view_instance_get_current_view (priv->view_instance), gcal);
}

/**
 * gnome_calendar_discard_view_menus:
 * @gcal: A calendar.
 * 
 * Discards the #GalView menus used by a calendar.  This function should be
 * called from the Bonobo control deactivation callback for this calendar.  The
 * menus should have been set up with gnome_calendar_setup_view_menus().
 **/
void
gnome_calendar_discard_view_menus (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);

    priv = gcal->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;
}

EPopupMenu *
gnome_calendar_setup_view_popup (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    g_return_val_if_fail (gcal != NULL, NULL);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    priv = gcal->priv;

    g_return_val_if_fail (priv->view_instance != NULL, NULL);

    return gal_view_instance_get_popup_menu (priv->view_instance);
}

void
gnome_calendar_discard_view_popup (GnomeCalendar *gcal, EPopupMenu *popup)
{


    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    g_return_if_fail (priv->view_instance != NULL);

    gal_view_instance_free_popup_menu (priv->view_instance, popup);
}

static void
gnome_calendar_set_pane_positions   (GnomeCalendar  *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    if (priv->current_view_type == GNOME_CAL_MONTH_VIEW && !priv->range_selected) {
        gtk_paned_set_position (GTK_PANED (priv->hpane), priv->hpane_pos_month_view);
        gtk_paned_set_position (GTK_PANED (priv->vpane), priv->vpane_pos_month_view);
    } else {
        gtk_paned_set_position (GTK_PANED (priv->hpane), priv->hpane_pos);
        gtk_paned_set_position (GTK_PANED (priv->vpane), priv->vpane_pos);
    }
}

/* Displays an error to indicate that opening a calendar failed */
static void
open_error (GnomeCalendar *gcal, const char *uri)
{
    char *msg;
    char *urinopwd;

    urinopwd = get_uri_without_password (uri);
    msg = g_strdup_printf (_("Could not open the folder in `%s'"), urinopwd);
    gnome_error_dialog_parented (msg, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (gcal))));
    g_free (msg);
    g_free (urinopwd);
}

/* Displays an error to indicate that the specified URI method is not supported */
static void
method_error (GnomeCalendar *gcal, const char *uri)
{
    char *msg;
    char *urinopwd;

    urinopwd = get_uri_without_password (uri);
    msg = g_strdup_printf (_("The method required to open `%s' is not supported"), urinopwd);
    gnome_error_dialog_parented (msg, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (gcal))));
    g_free (msg);
    g_free (urinopwd);
}

/* Displays an error to indicate permission problems */
static void
permission_error (GnomeCalendar *gcal, const char *uri)
{
    char *msg;
    char *urinopwd;

    urinopwd = get_uri_without_password (uri);
    msg = g_strdup_printf (_("You don't have permission to open the folder in `%s'"), urinopwd);
    gnome_error_dialog_parented (msg, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (gcal))));
    g_free (msg);
    g_free (urinopwd);
}

/* Callback from the calendar client when a calendar is loaded */
static gboolean
update_e_cal_view_timeout (gpointer data)
{
    GnomeCalendar *gcal = data;
    GnomeCalendarPrivate *priv;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    update_query (gcal);
    priv->e_cal_view_timeout = 0;

    return FALSE;
}

static void
client_cal_opened_cb (ECal *client, ECalendarStatus status, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    char *msg;
    char *uristr;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    switch (status) {
    case E_CALENDAR_STATUS_OK:
        /* Set the client's default timezone, if we have one. */
        if (priv->zone) {
            /* FIXME Error checking */
            e_cal_set_default_timezone (client, priv->zone, NULL);
        }

        /* add the alarms for this client */
        uristr = get_uri_without_password (e_cal_get_uri (client));
        msg = g_strdup_printf (_("Adding alarms for %s"), uristr);
        g_free (uristr);
        if (client == priv->task_pad_client) {
            e_calendar_table_set_status_message (E_CALENDAR_TABLE (priv->todo), msg);
            e_cal_model_add_client (e_calendar_table_get_model (E_CALENDAR_TABLE (priv->todo)),
                        priv->task_pad_client);
        }
        else {
            e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), msg);
            e_cal_model_add_client (e_calendar_view_get_model (E_CALENDAR_VIEW (priv->week_view)), client);

            priv->e_cal_view_timeout = g_timeout_add (100, update_e_cal_view_timeout, gcal);
        }
        g_free (msg);

        break;

    case E_CALENDAR_STATUS_OTHER_ERROR:
        open_error (gcal, e_cal_get_uri (client));
        break;

    case E_CALENDAR_STATUS_NO_SUCH_CALENDAR:
        /* bullshit; we did not specify only_if_exists */
        g_assert_not_reached ();
        return;

    case E_CALENDAR_STATUS_PROTOCOL_NOT_SUPPORTED:
        method_error (gcal, e_cal_get_uri (client));
        break;

    case E_CALENDAR_STATUS_PERMISSION_DENIED :
        permission_error (gcal, e_cal_get_uri (client));
        break;

    default:
        g_assert_not_reached ();
        return;
    }

    if (client == priv->task_pad_client)
        e_calendar_table_set_status_message (E_CALENDAR_TABLE (priv->todo), NULL);
    else
        e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), NULL);
}

/* Duplicates an array of categories */
static GPtrArray *
copy_categories (GPtrArray *categories)
{
    GPtrArray *c;
    int i;

    c = g_ptr_array_new ();
    g_ptr_array_set_size (c, categories->len);

    for (i = 0; i < categories->len; i++)
        c->pdata[i] = g_strdup (categories->pdata[i]);

    return c;
}

/* Adds the categories from an array to a hash table if they don't exist there
 * already.
 */
static void
add_categories (GHashTable *categories, GPtrArray *c)
{
    int i;

    if (!c)
        return;

    for (i = 0; i < c->len; i++) {
        const char *cat;
        const char *str;

        cat = c->pdata[i];
        str = g_hash_table_lookup (categories, cat);

        if (!str)
            g_hash_table_insert (categories, (char *) cat, NULL);
    }
}

/* Used to append categories from a hash table to an array */
struct append_category_closure {
    GPtrArray *c;

    int i;
};

/* Appends a category from the hash table to the array */
static void
append_category_cb (gpointer key, gpointer value, gpointer data)
{
    struct append_category_closure *closure;
    const char *category;

    category = key;
    closure = data;

    closure->c->pdata[closure->i] = g_strdup (category);
    closure->i++;
}

/* Creates the union of two sets of categories */
static GPtrArray *
merge_categories (GPtrArray *a, GPtrArray *b)
{
    GHashTable *categories;
    int n;
    GPtrArray *c;
    struct append_category_closure closure;

    categories = g_hash_table_new (g_str_hash, g_str_equal);

    add_categories (categories, a);
    add_categories (categories, b);

    n = g_hash_table_size (categories);

    c = g_ptr_array_new ();
    g_ptr_array_set_size (c, n);

    closure.c = c;
    closure.i = 0;
    g_hash_table_foreach (categories, append_category_cb, &closure);
    g_hash_table_destroy (categories);

    return c;
}

/* Callback from the calendar client when the set of categories changes.  We
 * have to merge the categories of the calendar and tasks clients.
 */
static void
client_categories_changed_cb (ECal *client, GPtrArray *categories, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    GPtrArray *merged;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    if (client == priv->task_pad_client) {
        free_categories (priv->tasks_categories);
        priv->tasks_categories = copy_categories (categories);
    } else {
        free_categories (priv->cal_categories);
        priv->cal_categories = copy_categories (categories);
    }

    merged = merge_categories (priv->cal_categories, priv->tasks_categories);
    cal_search_bar_set_categories (CAL_SEARCH_BAR (priv->search_bar), merged);
    free_categories (merged);
}

/* Callback when we get an error message from the backend */
static void
backend_error_cb (ECal *client, const char *message, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    char *errmsg;
    char *uristr;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

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

/* Callback when the backend dies */
static void
backend_died_cb (ECal *client, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    char *message;
    char *uristr;

    gcal = GNOME_CALENDAR (data);
    priv = gcal->priv;

    /* FIXME This doesn't remove the calendar from the list or anything */
    uristr = get_uri_without_password (e_cal_get_uri (client));
    if (client == priv->task_pad_client) {
        message = g_strdup_printf (_("The task backend for\n%s\n has crashed. "
                         "You will have to restart Evolution in order "
                         "to use it again"),
                       uristr);
        e_calendar_table_set_status_message (E_CALENDAR_TABLE (priv->todo), NULL);
    } else {
        int i;
        
        message = g_strdup_printf (_("The calendar backend for\n%s\n has crashed. "
                         "You will have to restart Evolution in order "
                         "to use it again"),
                       uristr);
        
        for (i = 0; i < GNOME_CAL_LAST_VIEW; i++)
            e_calendar_view_set_status_message (priv->views[i], NULL);
    }

    gnome_error_dialog_parented (message, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (gcal))));
    g_free (message);
    g_free (uristr);
}

GtkWidget *
gnome_calendar_construct (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GnomeCalendarViewType view_type;

    g_return_val_if_fail (gcal != NULL, NULL);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    priv = gcal->priv;

    /*
     * TaskPad Folder Client.
     */
    priv->task_pad_client = e_cal_new ("", CALOBJ_TYPE_TODO); /* FIXME: use default tasks */
    if (!priv->task_pad_client)
        return NULL;

    g_signal_connect (priv->task_pad_client, "cal_opened",
              G_CALLBACK (client_cal_opened_cb), gcal); 
    g_signal_connect (priv->task_pad_client, "backend_error",
              G_CALLBACK (backend_error_cb), gcal);
    g_signal_connect (priv->task_pad_client, "categories_changed",
              G_CALLBACK (client_categories_changed_cb), gcal);
    g_signal_connect (priv->task_pad_client, "backend_died",
              G_CALLBACK (backend_died_cb), gcal);

    /* Get the default view to show. */
    view_type = calendar_config_get_default_view ();
    if (view_type < GNOME_CAL_DAY_VIEW || view_type > GNOME_CAL_LIST_VIEW)
        view_type = GNOME_CAL_DAY_VIEW;

    gnome_calendar_set_view (gcal, view_type, FALSE, FALSE);

    return GTK_WIDGET (gcal);
}

GtkWidget *
gnome_calendar_new (void)
{
    GnomeCalendar *gcal;

    gcal = g_object_new (gnome_calendar_get_type (), NULL);

    if (!gnome_calendar_construct (gcal)) {
        g_message ("gnome_calendar_new(): Could not construct the calendar GUI");
        g_object_unref (gcal);
        return NULL;
    }

    return GTK_WIDGET (gcal);
}

void
gnome_calendar_set_ui_component (GnomeCalendar *gcal,
                 BonoboUIComponent *ui_component)
{
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (ui_component == NULL || BONOBO_IS_UI_COMPONENT (ui_component));

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

/**
 * gnome_calendar_get_calendar_model:
 * @gcal: A calendar view.
 *
 * Queries the calendar model object that a calendar view is using.
 *
 * Return value: A calendar client interface object.
 **/
ECalModel *
gnome_calendar_get_calendar_model (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    g_return_val_if_fail (gcal != NULL, NULL);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    priv = gcal->priv;

    return e_calendar_view_get_model (priv->views[priv->current_view_type]);
}

/**
 * gnome_calendar_get_default_client
 */
ECal *
gnome_calendar_get_default_client (GnomeCalendar *gcal)
{
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    return e_cal_model_get_default_client (e_calendar_view_get_model (E_CALENDAR_VIEW (gcal->priv->week_view)));
}

/**
 * gnome_calendar_get_task_pad_e_cal:
 * @gcal: A calendar view.
 *
 * Queries the calendar client interface object that a calendar view is using
 * for the Task Pad.
 *
 * Return value: A calendar client interface object.
 **/
ECal *
gnome_calendar_get_task_pad_e_cal (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    g_return_val_if_fail (gcal != NULL, NULL);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    priv = gcal->priv;

    return priv->task_pad_client;
}

/**
 * gnome_calendar_add_event_uri:
 * @gcal: A GnomeCalendar.
 * @str_uri: URI to add to the calendar views.
 *
 * Adds the given calendar URI to the calendar views.
 *
 * Returns: TRUE if successful, FALSE if error.
 */
gboolean
gnome_calendar_add_event_uri (GnomeCalendar *gcal, const char *str_uri)
{
    GnomeCalendarPrivate *priv;
    ECal *client;
    int i;
    
    g_return_val_if_fail (gcal != NULL, FALSE);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), FALSE);
    g_return_val_if_fail (str_uri != NULL, FALSE);

    priv = gcal->priv;

    client = g_hash_table_lookup (priv->clients, str_uri);
    if (client)
        return TRUE;
    
    client = e_cal_new (str_uri, CALOBJ_TYPE_EVENT);
    g_hash_table_insert (priv->clients, g_strdup (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), gcal);
    g_signal_connect (G_OBJECT (client), "categories_changed", G_CALLBACK (client_categories_changed_cb), gcal);
    g_signal_connect (G_OBJECT (client), "backend_died", G_CALLBACK (backend_died_cb), gcal);

    /* FIXME Do this async? */
    if (!e_cal_open (client, FALSE, NULL)) {
        g_hash_table_remove (priv->clients, str_uri);
        priv->clients_list = g_list_prepend (priv->clients_list, client);
        g_signal_handlers_disconnect_matched (client, G_SIGNAL_MATCH_DATA,
                              0, 0, NULL, NULL, gcal);  

        return FALSE;
    }

    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
        ECalModel *model;
        
        model = e_calendar_view_get_model (priv->views[i]);
        e_cal_model_add_client (model, client);
    }

    /* update date navigator query */
    update_query (gcal);

    return TRUE;
}

/**
 * gnome_calendar_remove_event_uri
 * @gcal: A #GnomeCalendar.
 * @str_uri: URI to be removed from the clients.
 *
 * Removes the given URI from the list of clients being shown by the
 * calendar views.
 *
 * Returns: TRUE if successful, FALSE otherwise.
 */
gboolean
gnome_calendar_remove_event_uri (GnomeCalendar *gcal, const char *str_uri)
{
    GnomeCalendarPrivate *priv;
    ECal *client;
    int i;

    g_return_val_if_fail (gcal != NULL, FALSE);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), FALSE);
    g_return_val_if_fail (str_uri != NULL, FALSE);

    priv = gcal->priv;

    client = g_hash_table_lookup (priv->clients, str_uri);
    if (!client)
        return TRUE;

    g_hash_table_remove (priv->clients, str_uri);
    priv->clients_list = g_list_remove (priv->clients_list, client);
    g_signal_handlers_disconnect_matched (client, G_SIGNAL_MATCH_DATA,
                          0, 0, NULL, NULL, gcal);  

    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
        ECalModel *model;

        model = e_calendar_view_get_model (priv->views[i]);
        e_cal_model_remove_client (model, client);
    }

    /* update date navigator query */
        update_query (gcal);

    return TRUE;
}

/**
 * gnome_calendar_set_default_uri:
 * @gcal: A calendar view
 * @uri: The uri to use as default
 * 
 * Set the default uri on the given calendar view, the default uri
 * will be used as the default when creating events in the view.

 * 
 * Return value: TRUE if the uri was already added and is set, FALSE
 * otherwise
 **/
gboolean
gnome_calendar_set_default_uri (GnomeCalendar *gcal, const char *str_uri)
{
    GnomeCalendarPrivate *priv;
    ECal *client;
    int i;

    g_return_val_if_fail (gcal != NULL, FALSE);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), FALSE);
    g_return_val_if_fail (str_uri != NULL, FALSE);

    priv = gcal->priv;
    
    client = g_hash_table_lookup (priv->clients, str_uri);
    if (!client)
        return FALSE;
    
    for (i = 0; i < GNOME_CAL_LAST_VIEW; i++) {
        e_cal_model_set_default_client (
            e_calendar_view_get_model (E_CALENDAR_VIEW (priv->views[i])),
            client);
    }

    return TRUE;
}

void
gnome_calendar_set_selected_time_range (GnomeCalendar *gcal,
                    time_t         start_time,
                    time_t         end_time)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    priv->selection_start_time = start_time;
    priv->selection_end_time = end_time;

    gnome_calendar_update_date_navigator (gcal);
    gnome_calendar_notify_dates_shown_changed (gcal);
}

/**
 * gnome_calendar_get_selected_time_range:
 * @gcal: A calendar view.
 * @start_time: Return value for the start of the time selection.
 * @end_time: Return value for the end of the time selection.
 *
 * Queries the time selection range on the calendar view.
 **/
void
gnome_calendar_get_selected_time_range (GnomeCalendar *gcal,
                    time_t   *start_time,
                    time_t   *end_time)
{
    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    if (start_time)
        *start_time = priv->selection_start_time;

    if (end_time)
        *end_time = priv->selection_end_time;
}

/**
 * gnome_calendar_new_task:
 * @gcal: An Evolution calendar.
 *
 * Opens a task editor dialog for a new task.
 **/
void
gnome_calendar_new_task     (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    TaskEditor *tedit;
    ECalComponent *comp;
    icalcomponent *icalcomp;
    const char *category;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    tedit = task_editor_new (priv->task_pad_client);

    icalcomp = e_cal_model_create_component_with_defaults (e_calendar_view_get_model (E_CALENDAR_VIEW (priv->week_view)));
    comp = e_cal_component_new ();
    e_cal_component_set_icalcomponent (comp, icalcomp);

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

    comp_editor_edit_comp (COMP_EDITOR (tedit), comp);
    g_object_unref (comp);

    comp_editor_focus (COMP_EDITOR (tedit));
}


/* Returns the selected time range for the current view. Note that this may be
   different from the fields in the GnomeCalendar, since the view may clip
   this or choose a more appropriate time. */
void
gnome_calendar_get_current_time_range (GnomeCalendar *gcal,
                       time_t    *start_time,
                       time_t    *end_time)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    e_calendar_view_get_selected_time_range (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)),
                        start_time, end_time);
}


/* Gets the visible time range for the current view. Returns FALSE if no
   time range has been set yet. */
gboolean
gnome_calendar_get_visible_time_range (GnomeCalendar *gcal,
                       time_t    *start_time,
                       time_t    *end_time)
{
    GnomeCalendarPrivate *priv;
    gboolean retval = FALSE;

    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), FALSE);

    priv = gcal->priv;

    retval = e_calendar_view_get_visible_time_range (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)),
                            start_time, end_time);

    return retval;
}



static void
get_days_shown (GnomeCalendar *gcal, GDate *start_date, gint *days_shown)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    switch (priv->current_view_type) {
    case GNOME_CAL_DAY_VIEW:
        time_to_gdate_with_zone (start_date,
                     E_DAY_VIEW (priv->day_view)->lower,
                     priv->zone);
        *days_shown = e_day_view_get_days_shown (E_DAY_VIEW (priv->day_view));
        break;

    case GNOME_CAL_WORK_WEEK_VIEW:
        time_to_gdate_with_zone (start_date,
                     E_DAY_VIEW (priv->work_week_view)->lower,
                     priv->zone);
        *days_shown = e_day_view_get_days_shown (E_DAY_VIEW (priv->work_week_view));
        break;

    case GNOME_CAL_WEEK_VIEW:
        *start_date = E_WEEK_VIEW (priv->week_view)->first_day_shown;
        if (e_week_view_get_multi_week_view (E_WEEK_VIEW (priv->week_view)))
            *days_shown = e_week_view_get_weeks_shown (
                E_WEEK_VIEW (priv->week_view)) * 7;
        else
            *days_shown = 7;

        break;

    case GNOME_CAL_MONTH_VIEW:
        *start_date = E_WEEK_VIEW (priv->month_view)->first_day_shown;
        if (e_week_view_get_multi_week_view (E_WEEK_VIEW (priv->month_view)))
            *days_shown = e_week_view_get_weeks_shown (
                E_WEEK_VIEW (priv->month_view)) * 7;
        else
            *days_shown = 7;

        break;

    case GNOME_CAL_LIST_VIEW:
        if (!e_cal_list_view_get_range_shown (E_CAL_LIST_VIEW (priv->list_view),
                              start_date, days_shown)) {
            /* No valid items in list */
            time_to_gdate_with_zone (start_date, time (NULL), priv->zone);
            *days_shown = 1;
        }
        else if (*days_shown < 1) {
            *days_shown = 1;
        }
        break;

    default:
        g_assert_not_reached ();
    }
}


/* This updates the month shown and the days selected in the calendar, if
   necessary. */
static void
gnome_calendar_update_date_navigator (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GDate start_date, end_date;
    gint days_shown;

    priv = gcal->priv;

    /* If the ECalendar isn't visible, we just return. */
    if (!GTK_WIDGET_VISIBLE (priv->date_navigator))
        return;

    get_days_shown (gcal, &start_date, &days_shown);

    end_date = start_date;
    g_date_add_days (&end_date, days_shown - 1);

    e_calendar_item_set_selection (priv->date_navigator->calitem,
                       &start_date, &end_date);
}


static void
gnome_calendar_on_date_navigator_selection_changed (ECalendarItem    *calitem,
                            GnomeCalendar    *gcal)
{
    GnomeCalendarPrivate *priv;
    GDate start_date, end_date, new_start_date, new_end_date;
    gint days_shown, new_days_shown;
    gboolean starts_on_week_start_day;
    struct icaltimetype tt;

    priv = gcal->priv;

    starts_on_week_start_day = FALSE;

    get_days_shown (gcal, &start_date, &days_shown);

    end_date = start_date;
    g_date_add_days (&end_date, days_shown - 1);

    e_calendar_item_get_selection (calitem, &new_start_date, &new_end_date);

    /* If the selection hasn't changed just return. */
    if (!g_date_compare (&start_date, &new_start_date)
        && !g_date_compare (&end_date, &new_end_date))
        return;

    new_days_shown = g_date_julian (&new_end_date) - g_date_julian (&new_start_date) + 1;

    /* If a complete week is selected we show the Week view.
       Note that if weekends are compressed and the week start day is set
       to Sunday we don't actually show complete weeks in the Week view,
       so this may need tweaking. */
    if (g_date_weekday (&new_start_date) % 7 == calendar_config_get_week_start_day ())
        starts_on_week_start_day = TRUE;

    /* Update selection to be in the new time range */
    tt = icaltime_null_time ();
    tt.year = g_date_year (&new_start_date);
    tt.month  = g_date_month (&new_start_date);
    tt.day = g_date_day (&new_start_date);
    priv->selection_start_time = icaltime_as_timet_with_zone (tt, priv->zone);
    icaltime_adjust (&tt, 1, 0, 0, 0);
    priv->selection_end_time = icaltime_as_timet_with_zone (tt, priv->zone);

    /* Switch views as appropriate, and change the number of days or weeks
       shown. */
    if (new_days_shown > 9) {
        e_week_view_set_weeks_shown (E_WEEK_VIEW (priv->month_view),
                         (new_days_shown + 6) / 7);
        e_week_view_set_first_day_shown (E_WEEK_VIEW (priv->month_view), &new_start_date);

        set_view (gcal, GNOME_CAL_MONTH_VIEW, TRUE, FALSE);
        gnome_calendar_update_date_navigator (gcal);
        gnome_calendar_notify_dates_shown_changed (gcal);
    } else if (new_days_shown == 7 && starts_on_week_start_day) {
        e_week_view_set_first_day_shown (E_WEEK_VIEW (priv->week_view), &new_start_date);

        set_view (gcal, GNOME_CAL_WEEK_VIEW, TRUE, FALSE);
        gnome_calendar_update_date_navigator (gcal);
        gnome_calendar_notify_dates_shown_changed (gcal);
    } else {        
        e_day_view_set_days_shown (E_DAY_VIEW (priv->day_view), new_days_shown);
        
        if (new_days_shown == 5 && priv->current_view_type == GNOME_CAL_WORK_WEEK_VIEW)
            gnome_calendar_set_view (gcal, GNOME_CAL_WORK_WEEK_VIEW, TRUE, FALSE);
        else
            gnome_calendar_set_view (gcal, GNOME_CAL_DAY_VIEW, TRUE, FALSE);

    }

    focus_current_view (gcal);
}


static void
gnome_calendar_on_date_navigator_date_range_changed (ECalendarItem *calitem,
                             GnomeCalendar *gcal)
{
    update_query (gcal);
}

static void
gnome_calendar_hpane_realized (GtkWidget *w, GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    if (priv->current_view_type == GNOME_CAL_MONTH_VIEW && !priv->range_selected) {
        gtk_paned_set_position (GTK_PANED (priv->hpane), priv->hpane_pos_month_view);
    } else {
        gtk_paned_set_position (GTK_PANED (priv->hpane), priv->hpane_pos);
    }
}

static void
gnome_calendar_vpane_realized (GtkWidget *w, GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    if (priv->current_view_type == GNOME_CAL_MONTH_VIEW && !priv->range_selected) {
        gtk_paned_set_position (GTK_PANED (priv->vpane), priv->vpane_pos_month_view);
    } else {
        gtk_paned_set_position (GTK_PANED (priv->vpane), priv->vpane_pos);
    }
}

static gboolean
gnome_calendar_vpane_resized (GtkWidget *w, GdkEventButton *e, GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    if (priv->current_view_type == GNOME_CAL_MONTH_VIEW && !priv->range_selected) {
        priv->vpane_pos_month_view = gtk_paned_get_position (GTK_PANED (priv->vpane));
        calendar_config_set_month_vpane_pos (priv->vpane_pos_month_view);
    } else {
        priv->vpane_pos = gtk_paned_get_position (GTK_PANED (priv->vpane));
        calendar_config_set_vpane_pos (priv->vpane_pos);
    }

    return FALSE;
}

static gboolean
gnome_calendar_hpane_resized (GtkWidget *w, GdkEventButton *e, GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    gint times_width;

    priv = gcal->priv;

    if (priv->current_view_type == GNOME_CAL_MONTH_VIEW && !priv->range_selected) {
        priv->hpane_pos_month_view = gtk_paned_get_position (GTK_PANED (priv->hpane));
        calendar_config_set_month_hpane_pos (priv->hpane_pos_month_view);
    } else {
        priv->hpane_pos = gtk_paned_get_position (GTK_PANED (priv->hpane));
        calendar_config_set_hpane_pos (priv->hpane_pos);
    }

    /* adjust the size of the EDayView's time column */
    times_width = e_day_view_time_item_get_column_width (
        E_DAY_VIEW_TIME_ITEM (E_DAY_VIEW (priv->day_view)->time_canvas_item));
    if (times_width < priv->hpane_pos - 20)
        gtk_widget_set_usize (E_DAY_VIEW (priv->day_view)->time_canvas, times_width, -1);
    else
        gtk_widget_set_usize (E_DAY_VIEW (priv->day_view)->time_canvas, priv->hpane_pos - 20, -1);
    
    
    return FALSE;
}

void
gnome_calendar_cut_clipboard (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    FocusLocation location;

    priv = gcal->priv;

    location = get_focus_location (gcal);

    if (location == FOCUS_CALENDAR) {
        e_calendar_view_cut_clipboard (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)));
    } else if (location == FOCUS_TASKPAD)
        e_calendar_table_cut_clipboard (E_CALENDAR_TABLE (priv->todo));
    else
        g_assert_not_reached ();
}

void
gnome_calendar_copy_clipboard (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    FocusLocation location;

    priv = gcal->priv;

    location = get_focus_location (gcal);

    if (location == FOCUS_CALENDAR) {
        e_calendar_view_copy_clipboard (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)));
    } else if (location == FOCUS_TASKPAD)
        e_calendar_table_copy_clipboard (E_CALENDAR_TABLE (priv->todo));
    else
        g_assert_not_reached ();
}

void
gnome_calendar_paste_clipboard (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    FocusLocation location;

    priv = gcal->priv;

    location = get_focus_location (gcal);

    if (location == FOCUS_CALENDAR) {
        e_calendar_view_paste_clipboard (E_CALENDAR_VIEW (gnome_calendar_get_current_view_widget (gcal)));
    } else if (location == FOCUS_TASKPAD)
        e_calendar_table_paste_clipboard (E_CALENDAR_TABLE (priv->todo));
    else
        g_assert_not_reached ();
}


/* Get the current timezone. */
icaltimezone*
gnome_calendar_get_timezone (GnomeCalendar  *gcal)
{
    g_return_val_if_fail (gcal != NULL, NULL);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    return gcal->priv->zone;
}


static void
gnome_calendar_notify_dates_shown_changed (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    time_t start_time, end_time;

    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    /* If no time range is set yet, just return. */
    if (!gnome_calendar_get_visible_time_range (gcal, &start_time,
                            &end_time))
        return;

    /* We check if the visible date range has changed, and only emit the
       signal if it has. (This makes sure we only change the folder title
       bar label in the shell when we need to.) */
    if (priv->visible_start != start_time
        || priv->visible_end != end_time) {
        priv->visible_start = start_time;
        priv->visible_end = end_time;

        gtk_signal_emit (GTK_OBJECT (gcal),
                 gnome_calendar_signals[DATES_SHOWN_CHANGED]);
    }
}


/* Returns the number of selected events (0 or 1 at present). */
gint
gnome_calendar_get_num_events_selected (GnomeCalendar *gcal)
{
    GtkWidget *view;
    gint retval = 0;

    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), 0);

    view = gnome_calendar_get_current_view_widget (gcal);
    if (E_IS_DAY_VIEW (view))
        retval = e_day_view_get_num_events_selected (E_DAY_VIEW (view));
    else
        retval = e_week_view_get_num_events_selected (E_WEEK_VIEW (view));

    return retval;
}

/**
 * gnome_calendar_get_num_tasks_selected:
 * @gcal: A calendar view.
 * 
 * Queries the number of tasks that are currently selected in the task pad of a
 * calendar view.
 * 
 * Return value: Number of selected tasks.
 **/
gint
gnome_calendar_get_num_tasks_selected (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    ETable *etable;

    g_return_val_if_fail (gcal != NULL, -1);
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), -1);

    priv = gcal->priv;

    etable = e_calendar_table_get_table (E_CALENDAR_TABLE (priv->todo));
    return e_table_selected_count (etable);
}


void
gnome_calendar_delete_selection     (GnomeCalendar  *gcal)
{
    GnomeCalendarPrivate *priv;
    FocusLocation location;
    GtkWidget *view;

    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    location = get_focus_location (gcal);

    if (location == FOCUS_CALENDAR) {
        view = gnome_calendar_get_current_view_widget (gcal);

        e_calendar_view_delete_selected_events (E_CALENDAR_VIEW (view));
    } else if (location == FOCUS_TASKPAD)
        e_calendar_table_delete_selected (E_CALENDAR_TABLE (priv->todo));
    else
        g_assert_not_reached ();
}

void
gnome_calendar_delete_selected_occurrence (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    FocusLocation location;
    GtkWidget *view;

    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    location = get_focus_location (gcal);

    if (location == FOCUS_CALENDAR) {

        view = gnome_calendar_get_current_view_widget (gcal);
        e_calendar_view_delete_selected_occurrence (E_CALENDAR_VIEW (view));
    }
}

static gboolean
check_instance_cb (ECalComponent *comp,
           time_t instance_start,
           time_t instance_end,
           gpointer data)
{
    gboolean *remove = data;

    *remove = FALSE;

    return FALSE;
}

void
gnome_calendar_purge (GnomeCalendar *gcal, time_t older_than)
{
    GnomeCalendarPrivate *priv;
    char *sexp, *start, *end;
    GList *l;

    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    start = isodate_from_time_t (0);
    end = isodate_from_time_t (older_than);
    sexp = g_strdup_printf ("(occur-in-time-range? (make-time \"%s\")"
                "                      (make-time \"%s\"))",
                start, end);

    e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), _("Purging"));

    /* FIXME Confirm expunge */
    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) {
            ECalComponent *comp;
            gboolean remove = TRUE;

            comp = e_cal_component_new ();
            e_cal_component_set_icalcomponent (comp, icalcomponent_new_clone (m->data));
            
            e_cal_recur_generate_instances (comp, older_than, -1,
                              (ECalRecurInstanceFn) check_instance_cb,
                              &remove,
                              (ECalRecurResolveTimezoneFn) e_cal_resolve_tzid_cb,
                              client, priv->zone);

            /* FIXME Better error handling */
            if (remove)
                e_cal_remove_object (client, icalcomponent_get_uid (m->data), NULL);
            
            g_object_unref (comp);
        }
    }

    e_calendar_view_set_status_message (E_CALENDAR_VIEW (priv->week_view), NULL);

    g_free (sexp);
    g_free (start);
    g_free (end);

}

ECalendarTable*
gnome_calendar_get_task_pad (GnomeCalendar *gcal)
{
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);

    return E_CALENDAR_TABLE (gcal->priv->todo);
}

GtkWidget *
gnome_calendar_get_e_calendar_widget (GnomeCalendar *gcal)
{
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);
 
    return GTK_WIDGET(gcal->priv->date_navigator);
}
 
GtkWidget *
gnome_calendar_get_search_bar_widget (GnomeCalendar *gcal)
{
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);
 
    return GTK_WIDGET(gcal->priv->search_bar);
}

GtkWidget *
gnome_calendar_get_view_notebook_widget (GnomeCalendar *gcal)
{
    g_return_val_if_fail (GNOME_IS_CALENDAR (gcal), NULL);
 
    return GTK_WIDGET(gcal->priv->notebook);
}