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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * GnomeCalendar widget
 * Copyright (C) 1998 the Free Software Foundation
 *
 * Authors: Miguel de Icaza (miguel@kernel.org)
 *          Federico Mena-Quintero <federico@helixcode.com>
 */

#include <config.h>
#include <gnome.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <gnome.h>
#include <gal/e-paned/e-hpaned.h>
#include <gal/e-paned/e-vpaned.h>
#include <cal-util/timeutil.h>
#include "dialogs/alarm-notify-dialog.h"
#include "alarm-notify.h"
#include "e-calendar-table.h"
#include "e-day-view.h"
#include "e-week-view.h"
#include "event-editor.h"
#include "gnome-cal.h"
#include "component-factory.h"
#include "calendar-commands.h"
#include "calendar-config.h"
#include "tag-calendar.h"



/* These must match the page numbers in the GtkNotebook. */
typedef enum {
    VIEW_NOT_SET = -1,
    VIEW_DAY = 0,
    VIEW_WORK_WEEK,
    VIEW_WEEK,
    VIEW_MONTH
} ViewType;

/* States for the calendar loading and creation state machine */
typedef enum {
    LOAD_STATE_NOT_LOADED,
    LOAD_STATE_WAIT_LOAD,
    LOAD_STATE_WAIT_LOAD_BEFORE_CREATE,
    LOAD_STATE_WAIT_CREATE,
    LOAD_STATE_LOADED
} LoadState;

/* Private part of the GnomeCalendar structure */
struct _GnomeCalendarPrivate {
    /* The calendar client object we monitor */
    CalClient   *client;

    /* Loading state; we can be loading or creating a calendar */
    LoadState load_state;

    /* URI being loaded, NULL if we are not being loaded */
    char *loading_uri;

    /* Mapping of component UIDs to event editors */
    GHashTable  *object_editor_hash;

    /* 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   *hpane;
    GtkWidget   *notebook;
    GtkWidget   *vpane;
    ECalendar   *date_navigator;
    GtkWidget   *todo;

    GtkWidget   *day_view;
    GtkWidget   *work_week_view;
    GtkWidget   *week_view;
    GtkWidget   *month_view;

    /* These are the toolbar radio buttons for switching views. */
    GtkWidget   *day_button;
    GtkWidget   *work_week_button;
    GtkWidget   *week_button;
    GtkWidget   *month_button;

    /* 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. */
    ViewType current_view_type;
    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. */
    gfloat       hpane_pos;
    gfloat       vpane_pos;
    gfloat       hpane_pos_month_view;
    gfloat       vpane_pos_month_view;

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

    /* Alarm ID for the midnight refresh function */
    gpointer midnight_alarm_refresh_id;

    /* UID->ObjectAlarms hash */
    GHashTable *alarms;

    /* Whether we are being destroyed and should not mess with the object
     * editor hash table.
     */
    guint in_destroy : 1;
};



/* A queued alarm for a component */
typedef struct {
    /* Alarm ID from alarm.h */
    gpointer alarm_id;

    /* Trigger instance this queued alarm refers to */
    CalAlarmInstance *instance;
} QueuedAlarm;

/* An entry in the UID->alarms hash table */
typedef struct {
    /* The actual component we keep around; its UID *is* the key in the hash
         * table.
     */
    CalComponentAlarms *alarms;

    /* List of QueuedAlarm structures */
    GList *queued_alarms;
} ObjectAlarms;



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_set_view_internal    (GnomeCalendar  *gcal,
                         char       *page_name,
                         gboolean    range_selected,
                         gboolean    focus);
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_on_date_navigator_style_set (GtkWidget *widget,
                            GtkStyle  *previous_style,
                            gpointer data);
static void gnome_calendar_update_paned_quanta (GnomeCalendar   *gcal);
static void gnome_calendar_on_date_navigator_size_allocate (GtkWidget     *widget,
                                GtkAllocation *allocation,
                                gpointer data);
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 gboolean gnome_calendar_get_days_shown   (GnomeCalendar  *gcal,
                         GDate      *start_date,
                         gint       *days_shown);


static GtkVBoxClass *parent_class;

#if 0
static void setup_alarm (GnomeCalendar *cal, CalAlarmInstance *ai);
#endif



GtkType
gnome_calendar_get_type (void)
{
    static GtkType gnome_calendar_type = 0;

    if (!gnome_calendar_type) {
        static const GtkTypeInfo gnome_calendar_info = {
            "GnomeCalendar",
            sizeof (GnomeCalendar),
            sizeof (GnomeCalendarClass),
            (GtkClassInitFunc) gnome_calendar_class_init,
            (GtkObjectInitFunc) gnome_calendar_init,
            NULL, /* reserved_1 */
            NULL, /* reserved_2 */
            (GtkClassInitFunc) NULL
        };

        gnome_calendar_type = gtk_type_unique (GTK_TYPE_VBOX, &gnome_calendar_info);
    }

    return gnome_calendar_type;
}

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

    object_class = (GtkObjectClass *) class;

    parent_class = gtk_type_class (GTK_TYPE_VBOX);

    object_class->destroy = gnome_calendar_destroy;
}

static void
setup_widgets (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GtkWidget *w;
    gchar *filename;

    priv = gcal->priv;

    /* The main HPaned, with the notebook of calendar views on the left
       and the ECalendar and ToDo list on the right. */
    priv->hpane = e_hpaned_new ();
    gtk_widget_show (priv->hpane);
    gtk_box_pack_start (GTK_BOX (gcal), priv->hpane, TRUE, TRUE, 0);

    /* 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);
    e_paned_pack1 (E_PANED (priv->hpane), priv->notebook, TRUE, TRUE);

    /* The VPaned widget, to contain the GtkCalendar & ToDo list. */
    priv->vpane = e_vpaned_new ();
    gtk_widget_show (priv->vpane);
    e_paned_pack2 (E_PANED (priv->hpane), priv->vpane, FALSE, TRUE);

    /* The ECalendar. */
    w = e_calendar_new ();
    priv->date_navigator = E_CALENDAR (w);
    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_paned_pack1 (E_PANED (priv->vpane), w, FALSE, TRUE);
    gtk_signal_connect (GTK_OBJECT (priv->date_navigator),
                "style_set",
                GTK_SIGNAL_FUNC (gnome_calendar_on_date_navigator_style_set),
                gcal);
    gtk_signal_connect_after (GTK_OBJECT (priv->date_navigator),
                  "size_allocate",
                  (GtkSignalFunc) gnome_calendar_on_date_navigator_size_allocate,
                  gcal);
    gtk_signal_connect (GTK_OBJECT (priv->date_navigator->calitem),
                "selection_changed",
                (GtkSignalFunc) gnome_calendar_on_date_navigator_selection_changed,
                gcal);
    gtk_signal_connect (GTK_OBJECT (priv->date_navigator->calitem),
                "date_range_changed",
                GTK_SIGNAL_FUNC (gnome_calendar_on_date_navigator_date_range_changed),
                gcal);

    /* The ToDo list. */
    priv->todo = e_calendar_table_new ();
    e_paned_pack2 (E_PANED (priv->vpane), priv->todo, TRUE, TRUE);
    gtk_widget_show (priv->todo);

    filename = g_strdup_printf ("%s/config/TaskPad", evolution_dir);
    e_calendar_table_load_state (E_CALENDAR_TABLE (priv->todo), filename);
    g_free (filename);

    /* The Day View. */
    priv->day_view = e_day_view_new ();
    e_day_view_set_calendar (E_DAY_VIEW (priv->day_view), gcal);
    gtk_widget_show (priv->day_view);
    gtk_notebook_append_page (GTK_NOTEBOOK (priv->notebook),
                  priv->day_view, gtk_label_new (""));

    /* 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_day_view_set_calendar (E_DAY_VIEW (priv->work_week_view), gcal);
    gtk_widget_show (priv->work_week_view);
    gtk_notebook_append_page (GTK_NOTEBOOK (priv->notebook),
                  priv->work_week_view, gtk_label_new (""));

    /* The Week View. */
    priv->week_view = e_week_view_new ();
    e_week_view_set_calendar (E_WEEK_VIEW (priv->week_view), gcal);
    gtk_widget_show (priv->week_view);
    gtk_notebook_append_page (GTK_NOTEBOOK (priv->notebook),
                  priv->week_view, gtk_label_new (""));

    /* The Month View. */
    priv->month_view = e_week_view_new ();
    e_week_view_set_calendar (E_WEEK_VIEW (priv->month_view), gcal);
    e_week_view_set_multi_week_view (E_WEEK_VIEW (priv->month_view), TRUE);
    gtk_widget_show (priv->month_view);
    gtk_notebook_append_page (GTK_NOTEBOOK (priv->notebook),
                  priv->month_view, gtk_label_new (""));

    gnome_calendar_update_config_settings (gcal, TRUE);
}

/* 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->load_state = LOAD_STATE_NOT_LOADED;

    priv->object_editor_hash = g_hash_table_new (g_str_hash, g_str_equal);
    priv->alarms = g_hash_table_new (g_str_hash, g_str_equal);

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

    setup_widgets (gcal);

    priv->selection_start_time = time_day_begin (time (NULL));
    priv->selection_end_time = time_add_day (priv->selection_start_time, 1);
}

/* Used from g_hash_table_foreach(); frees an object alarms entry */
static void
free_object_alarms (gpointer key, gpointer value, gpointer data)
{
    ObjectAlarms *oa;
    GList *l;

    oa = value;

    g_assert (oa->alarms != NULL);
    cal_component_alarms_free (oa->alarms);
    oa->alarms = NULL;

    g_assert (oa->queued_alarms != NULL);

    for (l = oa->queued_alarms; l; l = l->next) {
        QueuedAlarm *qa;

        qa = l->data;

        /* The instance structures were already freed by the call to
         * cal_component_alarms_free().
         */

        g_free (qa);
    }

    g_list_free (oa->queued_alarms);
    oa->queued_alarms = NULL;

    g_free (oa);
}

/* Used from g_hash_table_foreach(); frees an UID string */
static void
destroy_editor_cb (gpointer key, gpointer value, gpointer data)
{
    EventEditor *ee;

    ee = EVENT_EDITOR (value);
    gtk_object_unref (GTK_OBJECT (ee));
}

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;

    /* Save the TaskPad layout. */
    filename = g_strdup_printf ("%s/config/TaskPad", evolution_dir);
    e_calendar_table_save_state (E_CALENDAR_TABLE (priv->todo), filename);
    g_free (filename);

    priv->load_state = LOAD_STATE_NOT_LOADED;

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

    if (priv->client) {
        if (cal_client_is_loaded (priv->client))
            alarm_notify_remove_client (priv->client);

        gtk_object_unref (GTK_OBJECT (priv->client));
        priv->client = NULL;
    }

    g_hash_table_foreach (priv->alarms, free_object_alarms, NULL);
    g_hash_table_destroy (priv->alarms);
    priv->alarms = NULL;

    priv->in_destroy = TRUE;
    g_hash_table_foreach (priv->object_editor_hash, destroy_editor_cb, NULL);
    g_hash_table_destroy (priv->object_editor_hash);
    priv->object_editor_hash = NULL;

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

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

static GtkWidget *
get_current_page (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    return GTK_NOTEBOOK (priv->notebook)->cur_page->child;
}

char *
gnome_calendar_get_current_view_name (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GtkWidget *page;

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

    priv = gcal->priv;

    page = get_current_page (gcal);

    if (page == priv->day_view)
        return "dayview";
    else if (page == priv->work_week_view)
        return "workweekview";
    else if (page == priv->week_view)
        return "weekview";
    else if (page == priv->month_view)
        return "monthview";
    else {
        g_assert_not_reached ();
        return NULL;
    }
}

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 (new_time);
    priv->selection_end_time = time_add_day (priv->selection_start_time, 1);

    gnome_calendar_update_view_times (gcal);
    gnome_calendar_update_date_navigator (gcal);
}


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

    priv = gcal->priv;

    page = get_current_page (gcal);

    if (page == priv->day_view || page == priv->work_week_view) {
        e_day_view_set_selected_time_range (E_DAY_VIEW (page),
                            priv->selection_start_time,
                            priv->selection_end_time);
    } else if (page == priv->week_view || page == priv->month_view) {
        e_week_view_set_selected_time_range (E_WEEK_VIEW (page),
                             priv->selection_start_time,
                             priv->selection_end_time);
    } else {
        g_warning ("My penguin is gone!");
        g_assert_not_reached ();
    }
}

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

    priv = gcal->priv;

    cp = get_current_page (gcal);

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

    if (cp == priv->day_view) {
        start_time = time_add_day (start_time, direction);
        end_time = time_add_day (end_time, direction);
    } else if (cp == priv->work_week_view) {
        start_time = time_add_week (start_time, direction);
        end_time = time_add_week (end_time, direction);
    } else if (cp == priv->week_view) {
        start_time = time_add_week (start_time, direction);
        end_time = time_add_week (end_time, direction);
    } else if (cp == priv->month_view) {
        start_time = time_add_month (start_time, direction);
        end_time = time_add_month (end_time, direction);
    } else {
        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);
}

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 (time);
    priv->selection_end_time = time_add_day (priv->selection_start_time, 1);
    if (priv->day_button)
        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->day_button), TRUE);
    else
        gnome_calendar_set_view (gcal, "dayview", FALSE, TRUE);
}

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));

    gtk_widget_grab_focus (get_current_page (gcal));
}


/* This sets which view is currently shown. It also updates the selection time
   of the view so it shows the appropriate days. */
void
gnome_calendar_set_view     (GnomeCalendar  *gcal,
                 char       *page_name,
                 gboolean    range_selected,
                 gboolean    focus)
{
    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (page_name != NULL);

    gnome_calendar_set_view_internal (gcal, page_name, range_selected, focus);
    gnome_calendar_update_view_times (gcal);
    gnome_calendar_update_date_navigator (gcal);
}


/* This 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
gnome_calendar_set_view_internal    (GnomeCalendar  *gcal,
                     char       *page_name,
                     gboolean    range_selected,
                     gboolean    focus)
{
    GnomeCalendarPrivate *priv;
    int view;
    gboolean round_selection;
    GtkWidget *focus_widget;

    priv = gcal->priv;

    round_selection = FALSE;

    if (!strcmp (page_name, "dayview")) {
        view = VIEW_DAY;
        focus_widget = priv->day_view;

        if (!range_selected)
            e_day_view_set_days_shown (E_DAY_VIEW (priv->day_view), 1);
    } else if (!strcmp (page_name, "workweekview")) {
        view = VIEW_WORK_WEEK;
        focus_widget = priv->work_week_view;
    } else if (!strcmp (page_name, "weekview")) {
        view = VIEW_WEEK;
        focus_widget = priv->week_view;
        round_selection = TRUE;
    } else if (!strcmp (page_name, "monthview")) {
        view = VIEW_MONTH;
        focus_widget = priv->month_view;

        if (!range_selected)
            e_week_view_set_weeks_shown (E_WEEK_VIEW (priv->month_view), 5);
        round_selection = TRUE;
    } else {
        g_warning ("Unknown calendar view: %s", page_name);
        g_assert_not_reached ();
        return;
    }

    priv->current_view_type = view;
    priv->range_selected = range_selected;

    calendar_config_set_default_view (view);

    gtk_notebook_set_page (GTK_NOTEBOOK (priv->notebook), view);

    if (focus)
        gtk_widget_grab_focus (focus_widget);

    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. */
    gtk_object_set (GTK_OBJECT (priv->date_navigator->calitem),
            "round_selection_when_moving", round_selection,
            NULL);
}


static void
gnome_calendar_set_pane_positions   (GnomeCalendar  *gcal)
{
    GnomeCalendarPrivate *priv;
    gint top_border, bottom_border, left_border, right_border;
    gint col_width, row_height;
    gfloat right_pane_width, top_pane_height;

    priv = gcal->priv;

    /* Get the size of the calendar month width & height. */
    e_calendar_get_border_size (priv->date_navigator,
                    &top_border, &bottom_border,
                    &left_border, &right_border);
    gtk_object_get (GTK_OBJECT (priv->date_navigator->calitem),
            "row_height", &row_height,
            "column_width", &col_width,
            NULL);

    if (priv->current_view_type == VIEW_MONTH && !priv->range_selected) {
        right_pane_width = priv->hpane_pos_month_view;
        top_pane_height = priv->vpane_pos_month_view;
    } else {
        right_pane_width = priv->hpane_pos;
        top_pane_height = priv->vpane_pos;
    }

    /* We add the borders before multiplying due to the way we are using
       the EPaned quantum feature. */
    if (right_pane_width < 0.001)
        right_pane_width = 0.0;
    else
        right_pane_width = (right_pane_width * (col_width + left_border + right_border)
                    + 0.5);
    if (top_pane_height < 0.001)
        top_pane_height = 0.0;
    else
        top_pane_height = (top_pane_height * (row_height + top_border + bottom_border)
                   + 0.5);

    e_paned_set_position (E_PANED (priv->hpane), -1);
    e_paned_set_position (E_PANED (priv->vpane), -1);

    /* We add one to each dimension since we can't use 0. */

    gtk_widget_set_usize (priv->vpane, right_pane_width + 1, -2);
    gtk_widget_set_usize (GTK_WIDGET (priv->date_navigator), -2, top_pane_height + 1);
}

#if 0

/* Sends a mail notification of an alarm trigger */
static void
mail_notification (char *mail_address, char *text, time_t app_time)
{
    pid_t pid;
    int   p [2];
    char *command;

    pipe (p);
    pid = fork ();
    if (pid == 0){
        int dev_null;

        dev_null = open ("/dev/null", O_RDWR);
        dup2 (p [0], 0);
        dup2 (dev_null, 1);
        dup2 (dev_null, 2);
        execl ("/usr/lib/sendmail", "/usr/lib/sendmail",
               mail_address, NULL);
        _exit (127);
    }
    command = g_strconcat ("To: ", mail_address, "\n",
                   "Subject: ", _("Reminder of your appointment at "),
                   ctime (&app_time), "\n\n", text, "\n", NULL);
    write (p [1], command, strlen (command));
    close (p [1]);
    close (p [0]);
    g_free (command);
}

static int
max_open_files (void)
{
        static int files;

        if (files)
                return files;

        files = sysconf (_SC_OPEN_MAX);
        if (files != -1)
                return files;
#ifdef OPEN_MAX
        return files = OPEN_MAX;
#else
        return files = 256;
#endif
}

/* Executes a program as a notification of an alarm trigger */
static void
program_notification (char *command, int close_standard)
{
    struct sigaction ignore, save_intr, save_quit;
    int status = 0, i;
    pid_t pid;

    ignore.sa_handler = SIG_IGN;
    sigemptyset (&ignore.sa_mask);
    ignore.sa_flags = 0;

    sigaction (SIGINT, &ignore, &save_intr);
    sigaction (SIGQUIT, &ignore, &save_quit);

    if ((pid = fork ()) < 0){
        fprintf (stderr, "\n\nfork () = -1\n");
        return;
    }
    if (pid == 0){
        pid = fork ();
        if (pid == 0){
            const int top = max_open_files ();
            sigaction (SIGINT,  &save_intr, NULL);
            sigaction (SIGQUIT, &save_quit, NULL);

            for (i = (close_standard ? 0 : 3); i < top; i++)
                close (i);

            /* FIXME: As an excercise to the reader, copy the
             * code from mc to setup shell properly instead of
             * /bin/sh.  Yes, this comment is larger than a cut and paste.
             */
            execl ("/bin/sh", "/bin/sh", "-c", command, (char *) 0);

            _exit (127);
        } else {
            _exit (127);
        }
    }
    wait (&status);
    sigaction (SIGINT,  &save_intr, NULL);
    sigaction (SIGQUIT, &save_quit, NULL);
}

/* Queues a snooze alarm */
static void
snooze (GnomeCalendar *gcal, CalComponent *comp, time_t occur, int snooze_mins, gboolean audio)
{
    time_t now, trigger;
    struct tm tm;
    CalAlarmInstance ai;

    now = time (NULL);
    tm = *localtime (&now);
    tm.tm_min += snooze_mins;

    trigger = mktime (&tm);
    if (trigger == -1) {
        g_message ("snooze(): produced invalid time_t; not queueing alarm!");
        return;
    }

#if 0
    cal_component_get_uid (comp, &ai.uid);
    ai.type = audio ? ALARM_AUDIO : ALARM_DISPLAY;
#endif
    ai.trigger = trigger;
    ai.occur = occur;

    setup_alarm (gcal, &ai);
}

struct alarm_notify_closure {
    GnomeCalendar *gcal;
    CalComponent *comp;
    time_t occur;
};

/* Callback used for the result of the alarm notification dialog */
static void
display_notification_cb (AlarmNotifyResult result, int snooze_mins, gpointer data)
{
    struct alarm_notify_closure *c;

    c = data;

    switch (result) {
    case ALARM_NOTIFY_CLOSE:
        break;

    case ALARM_NOTIFY_SNOOZE:
        snooze (c->gcal, c->comp, c->occur, snooze_mins, FALSE);
        break;

    case ALARM_NOTIFY_EDIT:
        gnome_calendar_edit_object (c->gcal, c->comp);
        break;

    default:
        g_assert_not_reached ();
    }

    gtk_object_unref (GTK_OBJECT (c->comp));
    g_free (c);
}

/* Present a display notification of an alarm trigger */
static void
display_notification (time_t trigger, time_t occur, CalComponent *comp, GnomeCalendar *gcal)
{
    gboolean result;
    struct alarm_notify_closure *c;

    gtk_object_ref (GTK_OBJECT (comp));

    c = g_new (struct alarm_notify_closure, 1);
    c->gcal = gcal;
    c->comp = comp;
    c->occur = occur;

    result = alarm_notify_dialog (trigger, occur, comp, display_notification_cb, c);
    if (!result) {
        g_message ("display_notification(): could not display the alarm notification dialog");
        g_free (c);
        gtk_object_unref (GTK_OBJECT (comp));
    }
}

/* Present an audible notification of an alarm trigger */
static void
audio_notification (time_t trigger, time_t occur, CalComponent *comp, GnomeCalendar *gcal)
{
    g_message ("AUDIO NOTIFICATION!");
    /* FIXME */
}

/* Callback function used when an alarm is triggered */
static void
trigger_alarm_cb (gpointer alarm_id, time_t trigger, gpointer data)
{
    struct trigger_alarm_closure *c;
    GnomeCalendarPrivate *priv;
    CalComponent *comp;
    CalClientGetStatus status;
    const char *uid;
    ObjectAlarms *oa;
    GList *l;

    c = data;
    priv = c->gcal->priv;

    /* Fetch the object */

    status = cal_client_get_object (priv->client, c->uid, &comp);

    switch (status) {
    case CAL_CLIENT_GET_SUCCESS:
        /* Go on */
        break;
    case CAL_CLIENT_GET_SYNTAX_ERROR:
    case CAL_CLIENT_GET_NOT_FOUND:
        g_message ("trigger_alarm_cb(): syntax error in fetched object");
        return;
    }

    g_assert (comp != NULL);

    /* Present notification */

    switch (c->type) {
    case CAL_COMPONENT_ALARM_EMAIL:
#if 0
        g_assert (ico->malarm.enabled);
        mail_notification (ico->malarm.data, ico->summary, c->occur);
#endif
        break;

    case CAL_COMPONENT_ALARM_PROCEDURE:
#if 0
        g_assert (ico->palarm.enabled);
        program_notification (ico->palarm.data, FALSE);
#endif
        break;

    case CAL_COMPONENT_ALARM_DISPLAY:
#if 0
        g_assert (ico->dalarm.enabled);
#endif
        display_notification (trigger, c->occur, comp, c->gcal);
        break;

    case CAL_COMPONENT_ALARM_AUDIO:
#if 0
        g_assert (ico->aalarm.enabled);
#endif
        audio_notification (trigger, c->occur, comp, c->gcal);
        break;

    default:
        break;
    }

    /* Remove the alarm from the hash table */
    cal_component_get_uid (comp, &uid);
    oa = g_hash_table_lookup (priv->alarms, uid);
    g_assert (oa != NULL);

    l = g_list_find (oa->alarm_ids, alarm_id);
    g_assert (l != NULL);

    oa->alarm_ids = g_list_remove_link (oa->alarm_ids, l);
    g_list_free_1 (l);

    if (!oa->alarm_ids) {
        g_hash_table_remove (priv->alarms, uid);
        g_free (oa->uid);
        g_free (oa);
    }

    gtk_object_unref (GTK_OBJECT (comp));
}

#endif

/* Loads the initial data into the calendar; this should be called right after
 * the cal_loaded signal from the client is invoked.
 */
static void
initial_load (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    tag_calendar_by_client (priv->date_navigator, priv->client);
}

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

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

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

    msg = g_strdup_printf (_("Could not create a calendar in `%s'"), uri);
    gnome_error_dialog_parented (msg, GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (gcal))));
    g_free (msg);
}

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

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

/* Callback from the calendar client when a calendar is loaded */
static void
cal_loaded_cb (CalClient *client, CalClientLoadStatus status, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    gboolean free_uri;

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

    g_assert (priv->load_state != LOAD_STATE_NOT_LOADED && priv->load_state != LOAD_STATE_LOADED);
    g_assert (priv->loading_uri != NULL);

    free_uri = TRUE;

    switch (priv->load_state) {
    case LOAD_STATE_WAIT_LOAD:
        if (status == CAL_CLIENT_LOAD_SUCCESS) {
            priv->load_state = LOAD_STATE_LOADED;
            initial_load (gcal);
        } else if (status == CAL_CLIENT_LOAD_ERROR) {
            priv->load_state = LOAD_STATE_NOT_LOADED;
            load_error (gcal, priv->loading_uri);
        } else if (status == CAL_CLIENT_LOAD_METHOD_NOT_SUPPORTED) {
            priv->load_state = LOAD_STATE_NOT_LOADED;
            method_error (gcal, priv->loading_uri);
        } else
            g_assert_not_reached ();

        break;

    case LOAD_STATE_WAIT_LOAD_BEFORE_CREATE:
        if (status == CAL_CLIENT_LOAD_SUCCESS) {
            priv->load_state = LOAD_STATE_LOADED;
            initial_load (gcal);
        } else if (status == CAL_CLIENT_LOAD_ERROR) {
            priv->load_state = LOAD_STATE_WAIT_CREATE;
            free_uri = FALSE;

            if (!cal_client_create_calendar (priv->client, priv->loading_uri)) {
                priv->load_state = LOAD_STATE_NOT_LOADED;
                free_uri = TRUE;
                g_message ("cal_loaded_cb(): Could not issue the create request");
            }
        } else if (status == CAL_CLIENT_LOAD_METHOD_NOT_SUPPORTED) {
            priv->load_state = LOAD_STATE_NOT_LOADED;
            method_error (gcal, priv->loading_uri);
        } else
            g_assert_not_reached ();

        break;

    case LOAD_STATE_WAIT_CREATE:
        if (status == CAL_CLIENT_LOAD_SUCCESS) {
            priv->load_state = LOAD_STATE_LOADED;
            initial_load (gcal);
        } else if (status == CAL_CLIENT_LOAD_ERROR) {
            priv->load_state = LOAD_STATE_NOT_LOADED;
            create_error (gcal, priv->loading_uri);
        } else if (status == CAL_CLIENT_LOAD_IN_USE) {
            /* Someone created the URI while we were issuing the
             * create request, so we just try to reload.
             */
            priv->load_state = LOAD_STATE_WAIT_LOAD;
            free_uri = FALSE;

            if (!cal_client_load_calendar (priv->client, priv->loading_uri)) {
                priv->load_state = LOAD_STATE_NOT_LOADED;
                free_uri = TRUE;
                g_message ("cal_loaded_cb(): Could not issue the load request");
            }
        } else if (status == CAL_CLIENT_LOAD_METHOD_NOT_SUPPORTED) {
            priv->load_state = LOAD_STATE_NOT_LOADED;
            method_error (gcal, priv->loading_uri);
        } else
            g_assert_not_reached ();

        break;

    default:
        g_assert_not_reached ();
    }

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

/* Callback from the calendar client when an object is updated */
static void
obj_updated_cb (CalClient *client, const char *uid, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;

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

    tag_calendar_by_client (priv->date_navigator, priv->client);
}

/* Callback from the calendar client when an object is removed */
static void
obj_removed_cb (CalClient *client, const char *uid, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;

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

    tag_calendar_by_client (priv->date_navigator, priv->client);
}


GtkWidget *
gnome_calendar_construct (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    gint view;
    gchar *page;

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

    priv = gcal->priv;

    priv->client = cal_client_new ();
    if (!priv->client)
        return NULL;

    gtk_signal_connect (GTK_OBJECT (priv->client), "cal_loaded",
                GTK_SIGNAL_FUNC (cal_loaded_cb), gcal);
    gtk_signal_connect (GTK_OBJECT (priv->client), "obj_updated",
                GTK_SIGNAL_FUNC (obj_updated_cb), gcal);
    gtk_signal_connect (GTK_OBJECT (priv->client), "obj_removed",
                GTK_SIGNAL_FUNC (obj_removed_cb), gcal);

    alarm_notify_add_client (priv->client);

    e_calendar_table_set_cal_client (E_CALENDAR_TABLE (priv->todo), priv->client);

    e_day_view_set_cal_client (E_DAY_VIEW (priv->day_view), priv->client);
    e_day_view_set_cal_client (E_DAY_VIEW (priv->work_week_view), priv->client);
    e_week_view_set_cal_client (E_WEEK_VIEW (priv->week_view), priv->client);
    e_week_view_set_cal_client (E_WEEK_VIEW (priv->month_view), priv->client);

    view = calendar_config_get_default_view ();
    switch (view) {
    case 1:
        page = "workweekview";
        break;
    case 2:
        page = "weekview";
        break;
    case 3:
        page = "monthview";
        break;
    default:
        page = "dayview";
        break;
    }

    gnome_calendar_set_view (gcal, page, FALSE, FALSE);

    return GTK_WIDGET (gcal);
}

GtkWidget *
gnome_calendar_new (void)
{
    GnomeCalendar *gcal;

    gcal = gtk_type_new (gnome_calendar_get_type ());

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

    return GTK_WIDGET (gcal);
}

/**
 * gnome_calendar_get_cal_client:
 * @gcal: A calendar view.
 *
 * Queries the calendar client interface object that a calendar view is using.
 *
 * Return value: A calendar client interface object.
 **/
CalClient *
gnome_calendar_get_cal_client (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->client;
}

gboolean
gnome_calendar_open (GnomeCalendar *gcal, char *file, GnomeCalendarOpenMode gcom)
{
    GnomeCalendarPrivate *priv;

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

    priv = gcal->priv;
    g_return_val_if_fail (priv->load_state == LOAD_STATE_NOT_LOADED, FALSE);

    g_assert (priv->loading_uri == NULL);

    priv->loading_uri = g_strdup (file);

    if (gcom == CALENDAR_OPEN)
        priv->load_state = LOAD_STATE_WAIT_LOAD;
    else if (gcom == CALENDAR_OPEN_OR_CREATE)
        priv->load_state = LOAD_STATE_WAIT_LOAD_BEFORE_CREATE;
    else {
        g_assert_not_reached ();
        return FALSE;
    }

    if (!cal_client_load_calendar (priv->client, file)) {
        priv->load_state = LOAD_STATE_NOT_LOADED;
        g_free (priv->loading_uri);
        priv->loading_uri = NULL;

        g_message ("gnome_calendar_open(): Could not issue the request");
        return FALSE;
    }

    return TRUE;
}

#if 0

static void
stop_beeping (GtkObject* object, gpointer data)
{
    guint timer_tag, beep_tag;
    timer_tag = GPOINTER_TO_INT (gtk_object_get_data (object, "timer_tag"));
    beep_tag  = GPOINTER_TO_INT (gtk_object_get_data (object, "beep_tag"));

    if (beep_tag > 0) {
        gtk_timeout_remove (beep_tag);
        gtk_object_set_data (object, "beep_tag", GINT_TO_POINTER (0));
    }
    if (timer_tag > 0) {
        gtk_timeout_remove (timer_tag);
        gtk_object_set_data (object, "timer_tag", GINT_TO_POINTER (0));
    }
}

static gint
start_beeping (gpointer data)
{
    gdk_beep ();

    return TRUE;
}

static gint
timeout_beep (gpointer data)
{
    stop_beeping (data, NULL);
    return FALSE;
}

void
calendar_notify (time_t activation_time, CalendarAlarm *which, void *data)
{
    iCalObject *ico = data;
    guint beep_tag, timer_tag;
    int ret;
    gchar* snooze_button = (enable_snooze ? _("Snooze") : NULL);
    time_t now, diff;

    if (&ico->aalarm == which){
        time_t app = ico->aalarm.trigger + ico->aalarm.offset;
        GtkWidget *w;
        char *msg;

        msg = g_strconcat (_("Reminder of your appointment at "),
                    ctime (&app), "`",
                    ico->summary, "'", NULL);

        /* Idea: we need Snooze option :-) */
        w = gnome_message_box_new (msg, GNOME_MESSAGE_BOX_INFO, _("Ok"), snooze_button, NULL);
        beep_tag = gtk_timeout_add (1000, start_beeping, NULL);
        if (enable_aalarm_timeout)
            timer_tag = gtk_timeout_add (audio_alarm_timeout*1000,
                             timeout_beep, w);
        else
            timer_tag = 0;
        gtk_object_set_data (GTK_OBJECT (w), "timer_tag",
                     GINT_TO_POINTER (timer_tag));
        gtk_object_set_data (GTK_OBJECT (w), "beep_tag",
                     GINT_TO_POINTER (beep_tag));
        gtk_widget_ref (w);
        gtk_window_set_modal (GTK_WINDOW (w), FALSE);
        ret = gnome_dialog_run (GNOME_DIALOG (w));
        switch (ret) {
        case 1:
            stop_beeping (GTK_OBJECT (w), NULL);
            now = time (NULL);
            diff = now - which->trigger;
            which->trigger = which->trigger + diff + snooze_secs;
            which->offset  = which->offset - diff - snooze_secs;
            alarm_add (which, &calendar_notify, data);
            break;
        default:
            stop_beeping (GTK_OBJECT (w), NULL);
            break;
        }

        gtk_widget_unref (w);
        return;
    }

        if (&ico->palarm == which){
        execute (ico->palarm.data, 0);
        return;
    }

    if (&ico->malarm == which){
        time_t app = ico->malarm.trigger + ico->malarm.offset;

        mail_notify (ico->malarm.data, ico->summary, app);
        return;
    }

    if (&ico->dalarm == which){
        time_t app = ico->dalarm.trigger + ico->dalarm.offset;
        GtkWidget *w;
        char *msg;

        if (beep_on_display)
            gdk_beep ();
        msg = g_strconcat (_("Reminder of your appointment at "),
                    ctime (&app), "`",
                    ico->summary, "'", NULL);
        w = gnome_message_box_new (msg, GNOME_MESSAGE_BOX_INFO,
                       _("Ok"), snooze_button, NULL);
        gtk_window_set_modal (GTK_WINDOW (w), FALSE);
        ret = gnome_dialog_run (GNOME_DIALOG (w));
        switch (ret) {
        case 1:
            now = time (NULL);
            diff = now - which->trigger;
            which->trigger = which->trigger + diff + snooze_secs;
            which->offset  = which->offset - diff - snooze_secs;
            alarm_add (which, &calendar_notify, data);
            break;
        default:
            break;
        }

        return;
    }
}

#endif


/* Tells the calendar to reload all config settings.
   If initializing is TRUE it sets the pane positions as well. (We don't
   want to reset the pane positions after the user clicks 'Apply' in the
   preferences dialog.) */
void
gnome_calendar_update_config_settings (GnomeCalendar *gcal,
                       gboolean       initializing)
{
    GnomeCalendarPrivate *priv;
    CalWeekdays working_days;
    gint week_start_day, time_divisions;
    gint start_hour, start_minute, end_hour, end_minute;
    gboolean use_24_hour, show_event_end, compress_weekend;
    gboolean dnav_show_week_no;

    g_return_if_fail (GNOME_IS_CALENDAR (gcal));

    priv = gcal->priv;

    working_days = calendar_config_get_working_days ();
    /* CalWeekdays and EDayViewDays use the same bit-masks, so we can
       use the same value. */
    e_day_view_set_working_days (E_DAY_VIEW (priv->day_view),
                     (EDayViewDays) working_days);
    e_day_view_set_working_days (E_DAY_VIEW (priv->work_week_view),
                     (EDayViewDays) working_days);

    /* Note that this is 0 (Sun) to 6 (Sat). */
    week_start_day = calendar_config_get_week_start_day ();

    /* Convert it to 0 (Mon) to 6 (Sun), which is what we use. */
    week_start_day = (week_start_day + 6) % 7;

    e_day_view_set_week_start_day (E_DAY_VIEW (priv->day_view),
                    week_start_day);
    e_day_view_set_week_start_day (E_DAY_VIEW (priv->work_week_view),
                    week_start_day);
    e_week_view_set_week_start_day (E_WEEK_VIEW (priv->week_view),
                    week_start_day);
    e_week_view_set_week_start_day (E_WEEK_VIEW (priv->month_view),
                    week_start_day);
    gnome_canvas_item_set (GNOME_CANVAS_ITEM (E_CALENDAR (priv->date_navigator)->calitem),
                   "week_start_day", week_start_day,
                   NULL);

    start_hour = calendar_config_get_day_start_hour ();
    start_minute = calendar_config_get_day_start_minute ();
    end_hour = calendar_config_get_day_end_hour ();
    end_minute = calendar_config_get_day_end_minute ();
    e_day_view_set_working_day (E_DAY_VIEW (priv->day_view),
                    start_hour, start_minute,
                    end_hour, end_minute);
    e_day_view_set_working_day (E_DAY_VIEW (priv->work_week_view),
                    start_hour, start_minute,
                    end_hour, end_minute);

    use_24_hour = calendar_config_get_24_hour_format ();
    e_day_view_set_24_hour_format (E_DAY_VIEW (priv->day_view),
                       use_24_hour);
    e_day_view_set_24_hour_format (E_DAY_VIEW (priv->work_week_view),
                       use_24_hour);
    e_week_view_set_24_hour_format (E_WEEK_VIEW (priv->week_view),
                    use_24_hour);
    e_week_view_set_24_hour_format (E_WEEK_VIEW (priv->month_view),
                    use_24_hour);

    time_divisions = calendar_config_get_time_divisions ();
    e_day_view_set_mins_per_row (E_DAY_VIEW (priv->day_view),
                     time_divisions);
    e_day_view_set_mins_per_row (E_DAY_VIEW (priv->work_week_view),
                     time_divisions);

    show_event_end = calendar_config_get_show_event_end ();
    e_day_view_set_show_event_end_times (E_DAY_VIEW (priv->day_view),
                         show_event_end);
    e_day_view_set_show_event_end_times (E_DAY_VIEW (priv->work_week_view),
                         show_event_end);
    e_week_view_set_show_event_end_times (E_WEEK_VIEW (priv->week_view),
                          show_event_end);
    e_week_view_set_show_event_end_times (E_WEEK_VIEW (priv->month_view),
                          show_event_end);

    compress_weekend = calendar_config_get_compress_weekend ();
    e_week_view_set_compress_weekend (E_WEEK_VIEW (priv->month_view),
                      compress_weekend);

    dnav_show_week_no = calendar_config_get_dnav_show_week_no ();
    gnome_canvas_item_set (GNOME_CANVAS_ITEM (E_CALENDAR (priv->date_navigator)->calitem),
                   "show_week_numbers", dnav_show_week_no,
                   NULL);

    if (initializing) {
        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 ();
    } else {
        gnome_calendar_update_paned_quanta (gcal);
    }

    /* The range of days shown may have changed, so we update the date
       navigator if needed. */
    gnome_calendar_update_date_navigator (gcal);
}


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_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;
}


/* Callback used when an event editor dialog is closed */
struct editor_closure
{
    GnomeCalendar *gcal;
    char *uid;
};

static void
editor_closed_cb (GtkWidget *widget, gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    struct editor_closure *ec;
    gboolean result;
    gpointer orig_key;
    char *orig_uid;

    ec = (struct editor_closure *) data;
    gcal = ec->gcal;
    priv = gcal->priv;

    result = g_hash_table_lookup_extended (priv->object_editor_hash, ec->uid, &orig_key, NULL);
    g_assert (result != FALSE);

    orig_uid = orig_key;

    if (!priv->in_destroy)
        g_hash_table_remove (priv->object_editor_hash, orig_uid);

    g_free (orig_uid);

    g_free (ec);
}

void
gnome_calendar_edit_object (GnomeCalendar *gcal, CalComponent *comp)
{
    GnomeCalendarPrivate *priv;
    EventEditor *ee;
    struct editor_closure *ec;
    const char *uid;

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

    priv = gcal->priv;

    cal_component_get_uid (comp, &uid);

    ee = g_hash_table_lookup (priv->object_editor_hash, uid);
    if (!ee) {
        ec = g_new0 (struct editor_closure, 1);

        ee = event_editor_new ();
        if (!ee) {
            g_message ("gnome_calendar_edit_object(): Could not create the event editor");
            return;
        }

        ec->gcal = gcal;
        ec->uid = g_strdup (uid);

        g_hash_table_insert (priv->object_editor_hash, ec->uid, ee);

        gtk_signal_connect (GTK_OBJECT (ee), "destroy",
                    GTK_SIGNAL_FUNC (editor_closed_cb),
                    ec);

        event_editor_set_cal_client (EVENT_EDITOR (ee), priv->client);
        event_editor_set_event_object (EVENT_EDITOR (ee), comp);
    }

    event_editor_focus (ee);
}

/**
 * gnome_calendar_new_appointment:
 * @gcal: An Evolution calendar.
 *
 * Opens an event editor dialog for a new appointment.  The appointment's start
 * and end times are set to the currently selected time range in the calendar
 * views.
 **/
void
gnome_calendar_new_appointment (GnomeCalendar *gcal)
{
    CalComponent *comp;
    time_t dtstart, dtend;
    CalComponentDateTime dt;
    struct icaltimetype itt;

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

    gnome_calendar_get_current_time_range (gcal, &dtstart, &dtend);
    dt.value = &itt;
    dt.tzid = NULL;

    comp = cal_component_new ();
    cal_component_set_new_vtype (comp, CAL_COMPONENT_EVENT);

    itt = icaltime_from_timet (dtstart, FALSE, TRUE);
    cal_component_set_dtstart (comp, &dt);

    itt = icaltime_from_timet (dtend, FALSE, TRUE);
    cal_component_set_dtend (comp, &dt);

    cal_component_commit_sequence (comp);

    gnome_calendar_edit_object (gcal, comp);
    gtk_object_unref (GTK_OBJECT (comp));

}

/* 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;
    GtkWidget *page;

    priv = gcal->priv;

    page = get_current_page (gcal);

    if (page == priv->day_view || page == priv->work_week_view)
        e_day_view_get_selected_time_range (E_DAY_VIEW (page), start_time, end_time);
    else if (page == priv->week_view || page == priv->month_view)
        e_week_view_get_selected_time_range (E_WEEK_VIEW (page), start_time, end_time);
    else {
        g_message ("My penguin is gone!");
        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;

    if (gnome_calendar_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 gboolean
gnome_calendar_get_days_shown   (GnomeCalendar  *gcal,
                 GDate      *start_date,
                 gint       *days_shown)
{
    GnomeCalendarPrivate *priv;
    GtkWidget *page;

    priv = gcal->priv;

    page = get_current_page (gcal);

    if (page == priv->day_view || page == priv->work_week_view) {
        g_date_clear (start_date, 1);
        g_date_set_time (start_date, E_DAY_VIEW (page)->lower);
        *days_shown = e_day_view_get_days_shown (E_DAY_VIEW (page));
        return TRUE;
    } else if (page == priv->week_view || page == priv->month_view) {
        *start_date = E_WEEK_VIEW (page)->first_day_shown;
        if (e_week_view_get_multi_week_view (E_WEEK_VIEW (page)))
            *days_shown = e_week_view_get_weeks_shown (E_WEEK_VIEW (page)) * 7;
        else
            *days_shown = 7;

        return TRUE;
    } else {
        g_assert_not_reached ();
        return FALSE;
    }
}


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;
    gint start_year, start_month, start_day;
    gint end_year, end_month, end_day;
    gboolean starts_on_week_start_day;
    struct tm tm;

    priv = gcal->priv;

    starts_on_week_start_day = FALSE;

    if (!gnome_calendar_get_days_shown (gcal, &start_date, &days_shown))
        return;

    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;

    /* 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);

        gnome_calendar_set_view_internal (gcal, "monthview", TRUE, FALSE);
        gnome_calendar_update_date_navigator (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);

        gnome_calendar_set_view_internal (gcal, "weekview", TRUE, FALSE);
        gnome_calendar_update_date_navigator (gcal);
    } else {
        start_year = g_date_year (&new_start_date);
        start_month = g_date_month (&new_start_date) - 1;
        start_day = g_date_day (&new_start_date);
        end_year = g_date_year (&new_end_date);
        end_month = g_date_month (&new_end_date) - 1;
        end_day = g_date_day (&new_end_date);

        tm.tm_year = start_year - 1900;
        tm.tm_mon  = start_month;
        tm.tm_mday = start_day;
        tm.tm_hour = 0;
        tm.tm_min  = 0;
        tm.tm_sec  = 0;
        tm.tm_isdst = -1;
        priv->selection_start_time = mktime (&tm);

        tm.tm_year = end_year - 1900;
        tm.tm_mon  = end_month;
        tm.tm_mday = end_day + 1; /* mktime() will normalize this. */
        tm.tm_hour = 0;
        tm.tm_min  = 0;
        tm.tm_sec  = 0;
        tm.tm_isdst = -1;
        priv->selection_end_time = mktime (&tm);

        e_day_view_set_days_shown (E_DAY_VIEW (priv->day_view), new_days_shown);
        gnome_calendar_set_view (gcal, "dayview", TRUE, FALSE);
    }

    gnome_calendar_update_view_buttons (gcal);
    gtk_widget_grab_focus (get_current_page (gcal));
}


static void
gnome_calendar_on_date_navigator_date_range_changed (ECalendarItem *calitem,
                             GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;

    priv = gcal->priv;

    tag_calendar_by_client (priv->date_navigator, priv->client);
}


static void
gnome_calendar_on_date_navigator_style_set (GtkWidget     *widget,
                        GtkStyle      *previous_style,
                        gpointer       data)
{
    gnome_calendar_update_paned_quanta (GNOME_CALENDAR (data));
}


static void
gnome_calendar_update_paned_quanta (GnomeCalendar   *gcal)
{
    GnomeCalendarPrivate *priv;
    gint row_height, col_width;
    gint top_border, bottom_border, left_border, right_border;

    priv = gcal->priv;

    e_calendar_get_border_size (priv->date_navigator,
                    &top_border, &bottom_border,
                    &left_border, &right_border);
    gtk_object_get (GTK_OBJECT (priv->date_navigator->calitem),
            "row_height", &row_height,
            "column_width", &col_width,
            NULL);

    /* The EPaned quantum feature works better if we add on the calendar
       borders to the quantum size. Otherwise if you shrink the date
       navigator you get left with the border widths/heights which looks
       bad. EPaned should be more flexible really. */
    col_width += left_border + right_border;
    row_height += top_border + bottom_border;

    /* We don't have to use the EPaned quantum feature. We could just let
       the calendar expand to fill the allocated space, showing as many
       months as will fit. But for that to work nicely the EPaned should
       resize the widgets as the bar is dragged. Otherwise the user has
       to mess around to get the number of months that they want. */
#if 1
    gtk_object_set (GTK_OBJECT (priv->hpane),
            "quantum", (guint) col_width,
            NULL);
    gtk_object_set (GTK_OBJECT (priv->vpane),
            "quantum", (guint) row_height,
            NULL);
#endif

    gnome_calendar_set_pane_positions (gcal);
}


static void
gnome_calendar_on_date_navigator_size_allocate (GtkWidget     *widget,
                        GtkAllocation *allocation,
                        gpointer data)
{
    GnomeCalendar *gcal;
    GnomeCalendarPrivate *priv;
    gint width, height, row_height, col_width;
    gint top_border, bottom_border, left_border, right_border;
    gfloat hpane_pos, vpane_pos;

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

    if (priv->current_view_type != VIEW_NOT_SET) {
        e_calendar_get_border_size (priv->date_navigator,
                        &top_border, &bottom_border,
                        &left_border, &right_border);
        gtk_object_get (GTK_OBJECT (priv->date_navigator->calitem),
                "row_height", &row_height,
                "column_width", &col_width,
                NULL);

        /* We subtract one from each dimension since we added 1 in
           gnome_calendar_set_view_internal(). */
        width = allocation->width - 1;
        height = allocation->height - 1;

        /* We add the border sizes to work around the EPaned
           quantized feature. */
        col_width += left_border + right_border;
        row_height += top_border + bottom_border;

        hpane_pos = (gfloat) width / col_width;
        vpane_pos = (gfloat) height / row_height;

        if (priv->current_view_type == VIEW_MONTH
            && !priv->range_selected) {
            priv->hpane_pos_month_view = hpane_pos;
            priv->vpane_pos_month_view = vpane_pos;
            calendar_config_set_month_hpane_pos (hpane_pos);
            calendar_config_set_month_vpane_pos (vpane_pos);
        } else {
            priv->hpane_pos = hpane_pos;
            priv->vpane_pos = vpane_pos;
            calendar_config_set_hpane_pos (hpane_pos);
            calendar_config_set_vpane_pos (vpane_pos);
        }
    }
}

void
gnome_calendar_set_view_buttons (GnomeCalendar  *gcal,
                 GtkWidget  *day_button,
                 GtkWidget  *work_week_button,
                 GtkWidget  *week_button,
                 GtkWidget  *month_button)
{
    GnomeCalendarPrivate *priv;

    g_return_if_fail (gcal != NULL);
    g_return_if_fail (GNOME_IS_CALENDAR (gcal));
    g_return_if_fail (day_button != NULL);
    g_return_if_fail (GTK_IS_TOGGLE_BUTTON (day_button));
    g_return_if_fail (work_week_button != NULL);
    g_return_if_fail (GTK_IS_TOGGLE_BUTTON (work_week_button));
    g_return_if_fail (week_button != NULL);
    g_return_if_fail (GTK_IS_TOGGLE_BUTTON (week_button));
    g_return_if_fail (month_button != NULL);
    g_return_if_fail (GTK_IS_TOGGLE_BUTTON (month_button));

    priv = gcal->priv;

    priv->day_button = day_button;
    priv->work_week_button = work_week_button;
    priv->week_button = week_button;
    priv->month_button = month_button;
}

/* This makes the appropriate radio button in the toolbar active.  It blocks the
 * signals so that we can do a clean setup without affecting the views.
 */
void
gnome_calendar_update_view_buttons (GnomeCalendar *gcal)
{
    GnomeCalendarPrivate *priv;
    GtkWidget *page, *button;

    priv = gcal->priv;

    page = get_current_page (gcal);

    if (page == priv->day_view)
        button = priv->day_button;
    else if (page == priv->work_week_view)
        button = priv->work_week_button;
    else if (page == priv->week_view)
        button = priv->week_button;
    else if (page == priv->month_view)
        button = priv->month_button;
    else {
        g_assert_not_reached ();
        return;
    }

    if (button) {
        gtk_signal_handler_block_by_data (GTK_OBJECT (button), gcal);
        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
        gtk_signal_handler_unblock_by_data (GTK_OBJECT (button), gcal);
    }
}