/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Oracle Corporation code.
 *
 * The Initial Developer of the Original Code is
 *  Michiel van Leeuwen <mvl@exedo.nl>
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Berend Cornelius <berend.cornelius@sun.com>
 *
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#include "nsISupports.idl"

interface calIDateTime;

/**
 * This interface will calculate a week title from a given datetime. This
 * will depends on the users preferences. 
 * Extensions might override the default implementation, in order to
 * generate week titles aimed at special cases (like weeknumbers for a
 * schoolyear)
 */
[scriptable, uuid(650fd33b-ebf4-46fa-b9ca-dd80b2451498)]
interface calIWeekInfoService: nsISupports
{
    /**
     * Return the week title. It's meant to be displayed.
     * (Usually, will return a weeknumber, but might return a string like Q1W4)
     *
     * @param dateTime
     *            The dateTime to get the weektitle for
     * @returns
     *            A string, representing the week title. Will usually be the
     *            week number. Every week (7 days) should get a different string,
     *            but the switch from one week to the next isn't necessarily
     *            on sunday.
     */
    AString getWeekTitle(in calIDateTime dateTime);

    /**
     * Gets the first day of a week of a passed day under consideration 
     * of the preference setting "calendar.week.start"
     *
     * @param aDate     The dateTime to get get the start of the week for
     * @return          A dateTime-object denoting the first day of the week
     */
    calIDateTime getStartOfWeek(in calIDateTime dateTime);

    /**
     * Gets the last day of a week of a passed day under consideration
     * of the preference setting "calendar.week.start"
     *
     * @param aDate     The dateTime to get get the last day of the week for
     * @return          A dateTime-object denoting the last day of the week
     */
    calIDateTime getEndOfWeek(in calIDateTime dateTime);
};
