/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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
 *  Oracle Corporation
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir.vukicevic@oracle.com>
 *   Dan Mosedale <dan.mosedale@oracle.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface calIDuration;
[ptr] native icaltimetypeptr(struct icaltimetype);

[scriptable, uuid(5678d4a3-2543-4ece-afbb-079292f2866e)]
interface calIDateTime : nsISupports
{
  /**
   * isMutable is true if this instance is modifiable.
   * If isMutable is false, any attempts to modify
   * the object will throw CAL_ERROR_ITEM_IS_MUTABLE.
   */
  readonly attribute boolean isMutable;

  /**
   * Make this calIDateTime instance immutable.
   */
  void makeImmutable();

  /**
   * Clone this calIDateTime instance into a new
   * mutable object.
   */
  calIDateTime clone();

  /**
   * valid is true if this object contains a valid
   * time/date.
   */
  // true if this thing is set/valid
  readonly attribute boolean isValid;

  /**
   * nativeTime contains this instance's PRTime value relative
   * to the UTC epoch, regardless of the timezone that's set
   * on this instance.  If nativeTime is set, the given UTC PRTime
   * value is exploded into year/month/etc, taking into account
   * the timezone setting.
   *
   * @warning: When the timezone is set to 'floating', this will return
   * the nativeTime as-if the timezone was UTC. Take this into account
   * when comparing values.
   * 
   * @note on objects that are pinned to a timezone and have isDate set,
   * nativeTime will be 00:00:00 in the timezone of that date, not 00:00:00 in 
   * UTC.
   */
  attribute PRTime nativeTime;

  /**
   * Full 4-digit year value (e.g. "1989", "2004")
   */
  attribute short year;

  /**
   * Month, 0-11, 0 = January
   */
  attribute short month;

  /**
   * Day of month, 1-[28,29,31]
   */
  attribute short day;

  /**
   * Hour, 0-23
   */
  attribute short hour;

  /**
   * Minute, 0-59
   */
  attribute short minute;

  /**
   * Second, 0-59
   */
  attribute short second;

  /**
   * Gets or sets the timezone of this calIDateTime instance.
   * Setting the timezone does not change the actual date/time components;
   * to convert between timezones, use getInTimezone(). 
   *
   * Valid values are:
   *
   * - "UTC" (or "utc", "UTC" preferred)
   *   - the object refers to a time in UTC.
   * - a TZID string, understood by the ICS Service
   *   - the object refers to a time in that tz
   * - "floating"
   *   - the object is in floating time and does not have an
   *     associated timezone.
   *
   * @throws NS_ERROR_INVALID_ARG if an invalid timezone is passed in.
   */
  attribute AUTF8String timezone;

  /**
   * The offset of the timezone this datetime is in, relative to UTC, in
   * seconds. A positive number means that the timezone is ahead of UTC.
   */
  readonly attribute long timezoneOffset;

  /**
   * isDate indicates that this calIDateTime instance represents a date
   * (a whole day), and not a specific time on that day.  If isDate is set,
   * accessing the hour/minute/second fields will return 0, and and setting
   * them is an illegal operation.
   */
  attribute PRBool isDate;

  /*
   * computed values
   */

  /**
   * Day of the week. 0-6, with Sunday = 0.
   */
  readonly attribute short weekday;

  /**
   * Day of the year, 0-365/366.
   */
  readonly attribute short yearday;

  /*
   * Methods
   */

  /**
   * Reset this instance to an invalid state.
   */
  void reset();

  /**
   * Return a string representation of this instance.
   */
  AUTF8String toString();

  // normalize and validate the expanded-out values
  // XXX going away soon
  void normalize();

  /**
   * Set the value of this calIDateTime instance
   * to aTime milliseconds since the epoch in the
   * given timezone.  Valid values for the aTimezone
   * are either a known TZID or "UTC"; null/empty string
   * is not valid.
   */
  void setTimeInTimezone (in PRTime aTime, in AUTF8String aTimezone);

  /**
   * Return a new calIDateTime instance that's the result of
   * converting this one into the given timezone.  Valid values
   * for aTimezone are the same as the timezone field.  If
   * the "floating" timezone is given, then this object
   * is just cloned, and the timezone is set to floating.
   */
  calIDateTime getInTimezone (in AUTF8String aTimezone);

  // add the given calIDateTime, treating it as a duration, to
  // this item.
  // XXX will change
  void addDuration (in calIDuration aDuration);

  // Subtract two dates and return a duration
  // returns duration of this - aOtherDate
  // if aOtherDate is > this the duration will be negative
  calIDuration subtractDate (in calIDateTime aOtherDate);

  /**
   * Compare this calIDateTime instance to aOther.  Returns -1, 0, 1 to
   * indicate if this < aOther, this == aOther, or this > aOther,
   * respectively.
   *
   * This comparison is timezone-aware; the given values are converted
   * to a common timezone before comparing. If either this or aOther is
   * floating, both objects are treated as floating for the comparison.
   *
   * If either this or aOther has isDate set, then only the date portion is
   * compared.
   * 
   * @exception calIErrors.INVALID_TIMEZONE  bad timezone on this object
   *                                         (not the argument object)
   */
  long compare (in calIDateTime aOther);

  //
  // Some helper getters for calculating useful ranges
  //

  // the start/end of the current object's week
  readonly attribute calIDateTime startOfWeek;
  readonly attribute calIDateTime endOfWeek;

  // the start/end of the current object's month
  readonly attribute calIDateTime startOfMonth;
  readonly attribute calIDateTime endOfMonth;

  // the start/end of the current object's year
  readonly attribute calIDateTime startOfYear;
  readonly attribute calIDateTime endOfYear;

  [noscript,notxpcom] void toIcalTime(in icaltimetypeptr itt);

  /**
   * This object as either an iCalendar DATE or DATETIME string, as
   * appropriate.
   */
  attribute ACString icalString;

  /* JS only:
   * // Setting jsDate via a JavaScript Date object will set
   * // the calIDateTime to the jsDate's time ***in UTC***.
   * // There's no way for us to recover TZ info from a jsDate,
   * // so we always pull it out as UTC, and force the calIDateTime's
   * // timezone to UTC.
   * attribute Date jsDate;
   *
   */
};