/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* vim:expandtab:shiftwidth=8:tabstop=8:
 */
/* Evolution Accessibility: ea-calendar-helpers.c
 *
 * Copyright (C) 2003 Ximian, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: Bolian Yin <bolian.yin@sun.com> Sun Microsystem Inc., 2003
 *
 */

#include "ea-calendar-helpers.h"
#include "ea-cal-view-event.h"
#include "ea-jump-button.h"
#include "e-day-view.h"
#include "e-week-view.h"

#include <gal/e-text/e-text.h>
#include <libgnomecanvas/gnome-canvas-pixbuf.h>

/**
 * ea_calendar_helpers_get_accessible_for
 * @canvas_item: the canvas item for a event or a jump button
 * @returns: the atk object for the canvas_item
 * 
 **/
AtkObject *
ea_calendar_helpers_get_accessible_for (GnomeCanvasItem *canvas_item)
{
	AtkObject *atk_obj = NULL;
	GObject *g_obj;

	g_return_val_if_fail ((E_IS_TEXT (canvas_item)) || (GNOME_IS_CANVAS_ITEM (canvas_item)), NULL);;

	g_obj = G_OBJECT (canvas_item);
	/* we cannot use atk_gobject_accessible_for_object here,
	 * EaDayViewEvent/EaWeekViewEvent cannot be created by the
	 * registered facotry of E_TEXT
	 */
	atk_obj = g_object_get_data (g_obj, "accessible-object");
	if (!atk_obj) {
                if (E_IS_TEXT (canvas_item)) {
		atk_obj = ea_cal_view_event_new (g_obj);
                }
                else if (GNOME_IS_CANVAS_PIXBUF(canvas_item)) {
                        atk_obj = ea_jump_button_new (g_obj);
                }
                else
                        return NULL;
        }
	return atk_obj;
}

/**
 * ea_calendar_helpers_get_view_widget_from:
 * @canvas_item: the canvas item for a event or a jump button
 * @returns: the cal view widget if exists
 *
 * Get the cal view widget contains the canvas_item.
 * 
 **/
ECalendarView *
ea_calendar_helpers_get_cal_view_from (GnomeCanvasItem *canvas_item)
{
	GnomeCanvas *canvas;
	GtkWidget *view_widget = NULL;

	g_return_val_if_fail (canvas_item, NULL);
	g_return_val_if_fail ((E_IS_TEXT (canvas_item)) || (GNOME_IS_CANVAS_ITEM (canvas_item)), NULL);

	/* canvas_item is the e_text for the event */
	/* canvas_item->canvas is the ECanvas for day view */
	/* parent of canvas_item->canvas is the EDayView or EWeekView widget */
	canvas = canvas_item->canvas;
	view_widget = gtk_widget_get_parent (GTK_WIDGET(canvas));
	if (!view_widget || !E_IS_CAL_VIEW (view_widget))
		return NULL;
	return E_CAL_VIEW (view_widget);
}

/**
 * ea_calendar_helpers_get_cal_view_event_from
 * @canvas_item: the cavas_item (e_text) for the event
 * @returns: the ECalendarViewEvent
 *
 * Get the ECalendarViewEvent for the canvas_item.
 *
 **/
ECalendarViewEvent *
ea_calendar_helpers_get_cal_view_event_from (GnomeCanvasItem *canvas_item)
{
	ECalendarView *cal_view;
	gboolean event_found;
	ECalendarViewEvent *cal_view_event;

	g_return_val_if_fail (E_IS_TEXT (canvas_item), NULL);

	cal_view = ea_calendar_helpers_get_cal_view_from (canvas_item);

	if (!cal_view)
		return NULL;

	if (E_IS_DAY_VIEW (cal_view)) {
		gint event_day, event_num;
		EDayViewEvent *day_view_event;
		EDayView *day_view = E_DAY_VIEW (cal_view);
		event_found = e_day_view_find_event_from_item (day_view, canvas_item,
							       &event_day, &event_num);
		if (!event_found)
			return NULL;
		if (event_day == E_DAY_VIEW_LONG_EVENT) {
			/* a long event */
			day_view_event = &g_array_index (day_view->long_events,
							 EDayViewEvent, event_num);
		}
		else {
			/* a main canvas event */
			day_view_event = &g_array_index (day_view->events[event_day],
							 EDayViewEvent, event_num);
		}
		cal_view_event = (ECalendarViewEvent *) day_view_event;
	}
	else if (E_IS_WEEK_VIEW (cal_view)) {
		gint event_num, span_num;
		EWeekViewEvent *week_view_event;
		EWeekView *week_view = E_WEEK_VIEW (cal_view);
		event_found = e_week_view_find_event_from_item (week_view,
								canvas_item,
								&event_num,
								&span_num);
		if (!event_found)
			return NULL;

		week_view_event = &g_array_index (week_view->events, EWeekViewEvent,
						  event_num);

		cal_view_event = (ECalendarViewEvent *)week_view_event;
	}
	else {
		g_assert_not_reached ();
		return NULL;
	}
	return cal_view_event;
}
