/* -*- 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>
 *   Mike Shaver <shaver@mozilla.org>
 *
 * 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
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIArray;
interface nsIMutableArray;
interface nsISimpleEnumerator;
interface nsIVariant;

interface nsIPropertyBag;

interface calICalendar;

interface calIDateTime;

interface calIDuration;

interface calIRecurrenceInfo;

interface calIAttendee;

interface calIIcalComponent;

//
// calIItemBase
//
// Base for Events, Todos, Journals, etc.
//

[scriptable, uuid(18521d75-346d-4616-8778-de2c4a9a676e)]
interface calIItemBase : nsISupports
{
  // returns true if this thing is able to be modified;
  // if the item is not mutable, attempts to modify
  // any data will throw CAL_ERROR_ITEM_IS_IMMUTABLE
  readonly attribute boolean isMutable;

  // makes this item immutable
  void makeImmutable();

  // clone always returns a mutable event
  calIItemBase clone();

  /**
   * Hash Id that incorporates the item's UID, RECURRENCE-ID and calendar.id
   * to be used for lookup of items that come from different calendars.
   * Setting either id, recurrenceId or the calendar attribute leads to
   * a recomputation of hashId.
   *
   * @attention Individual implementors of calIItemBase must stick to the
   *            same algorithm that base/src/calItemBase.js uses.
   */
  readonly attribute AUTF8String hashId;

  /**
   * Checks whether the argument object refers the same calendar item as
   * this one, by testing both the id and recurrenceId property.  This 
   *
   * @arg aItem     the item to compare against this one
   *
   * @return        true if both ids match, false otherwise
   */
  boolean hasSameIds(in calIItemBase aItem);
  
  //
  // the generation number of this item; 0 means
  // that it's never been stored in a store
  //
  readonly attribute PRUint32 generation;

  // the time when this item was created
  readonly attribute calIDateTime creationDate;

  // last time any attribute was modified on this item, in UTC
  readonly attribute calIDateTime lastModifiedTime;

  // last time a "significant change" was made to this item
  readonly attribute calIDateTime stampTime;

  // indicate such a "significant change"
  void updateStampTime();

  // the calICalendar to which this event belongs
  attribute calICalendar calendar;

  // the ID of this event
  attribute AUTF8String id;

  // event title
  attribute AUTF8String title;

  // event priority
  attribute short priority;
  attribute AUTF8String privacy;

  // status of the event
  attribute AUTF8String status;

  // ical interop; writing this means parsing
  // the ical string into this event
  attribute AUTF8String icalString;

  // an icalComponent for this item, suitable for serialization.
  // the icalComponent returned is not live: changes in it or this
  // item will not be reflected in the other.
  attribute calIIcalComponent icalComponent;

  //
  // alarms
  //

  /**
   * The amount of time from the date (specified by alarmRelated) to offset
   * the alarm's firing time by
   */
  attribute calIDuration alarmOffset;

  /**
   * One of the ALARM_RELATED constants below.  
   */
  attribute unsigned long alarmRelated;

  /**
   * Corresponds to an alarmOffset that should be based off of the startDate or
   * entryDate (for events and tasks, respectively)
   */
  const unsigned long ALARM_RELATED_START = 0;

  /**
   * Corresponds to an alarmOffset that should be based off of the endDate or
   * dueDate (for events and tasks, respectively)
   */
  const unsigned long ALARM_RELATED_END = 1;

  // The last time this alarm was fired and acknowledged by the user
  attribute calIDateTime alarmLastAck;

  //
  // recurrence
  //
  attribute calIRecurrenceInfo recurrenceInfo;
  readonly attribute calIDateTime recurrenceStartDate;

  // attachments
  // array of nsIMsgAttachment
  // if this item is mutable, the returned array will be a nsIMutableArray
  readonly attribute nsIArray attachments;

  // 
  // All event properties are stored in a property bag;
  // some number of these are "promoted" to top-level
  // accessor attributes.  For example, "SUMMARY" is
  // promoted to the top-level "title" attribute.
  //
  // If you use the has/get/getUnproxied/set/deleteProperty
  // methods, property names are case-insensitive.
  // 
  // For purposes of ICS serialization, all property names in
  // the hashbag are in uppercase.
  //
  // The isPropertyPromoted() attribute can will indicate
  // if a particular property is promoted or not, for
  // serialization purposes.
  //

  // Note that if this item is a proxy, then any requests for
  // non-existant properties will be forward to the parent item.

  // some other properties that may exist:
  //
  // 'description' - description (string)
  // 'location' - location (string)
  // 'categories' - categories (string)
  // 'syncId' - sync id (string)
  // 'inviteEmailAddress' - string
  // alarmLength/alarmUnits/alarmEmailAddress/lastAlarmAck
  // recurInterval/recurCount/recurWeekdays/recurWeeknumber

  // these forward to an internal property bag; implemented here, so we can
  // do access control on set/delete to have control over mutability.
  readonly attribute nsISimpleEnumerator propertyEnumerator;
  boolean hasProperty(in AString name);
  nsIVariant getProperty(in AString name);
  void setProperty(in AString name, in nsIVariant value);
  // will not throw an error if you delete a property that doesn't exist
  void deleteProperty(in AString name);

  // returns true if the given property is promoted to some
  // top-level attribute (e.g. id or title)
  boolean isPropertyPromoted(in AString name);

  /**
   * Returns a particular parameter value for a property, or null if the 
   * parameter does not exist.  If the property does not exist, throws.
   *
   * @param aPropertyName  the name of the property
   * @param aParameterName the name of the parameter on the property
   */
   AString getPropertyParameter(in AString aPropertyName, 
                                in AString aParameterName);

  /**
   * The organizer (originator) of the item.  We will likely not
   * honour or preserve all fields in the calIAttendee passed around here.
   * A base class like calIPerson might be more appropriate here, if we ever
   * grow one.
   */
  attribute calIAttendee organizer;

  //
  // Attendees
  //

  // The array returned here is not live; it will not reflect calls to
  // removeAttendee/addAttendee that follow the call to getAttendees.
  void getAttendees(out PRUint32 count,
                    [array,size_is(count),retval] out calIAttendee attendees);

  /**
   * getAttendeeById's matching is done in a case-insensitive manner to handle
   * places where "MAILTO:" or similar properties are capitalized arbitrarily
   * by different calendar clients.
   */
  calIAttendee getAttendeeById(in AUTF8String id);
  void removeAttendee(in calIAttendee attendee);
  void addAttendee(in calIAttendee attendee);
  void removeAllAttendees();

  //
  // Occurrence querying
  //

  /**
   * Return a list of occurrences of this item between the given dates.  The items
   * returned are the same type as this one, as proxies.
   */
  void getOccurrencesBetween (in calIDateTime aStartDate, in calIDateTime aEndDate,
                              out PRUint32 aCount,
                              [array,size_is(aCount),retval] out calIItemBase aOccurrences);

  /**
   * The next occurrence after this one, if any.
   */
  readonly attribute calIItemBase nextOccurrence;

  /**
   * The previous occurrence before this one, if any.
   */
  readonly attribute calIItemBase previousOccurrence;

  //
  // proxy support
  //

  /**
   * create a proxy for this item; the returned item
   * proxy will have parentItem set to this instance.
   */
  calIItemBase createProxy();

  /**
   * If this item is a proxy, parentItem will point upwards
   * to our parent.  Otherwise, it will point to this.
   * parentItem can thus always be used for modifyItem() calls
   * to providers.
   */
  attribute calIItemBase parentItem;

  /**
   * The recurrence ID, a.k.a. DTSTART-of-calculated-occurrence,
   * or null if this isn't an occurrence.
   * Be conservative about setting this. It isn't marked as such, but
   * consider it as readonly.
   */
  attribute calIDateTime recurrenceId;

  /**
   * Returns the given property value if it is natively set on the item,
   * otherwise returns null.
   */
  nsIVariant getUnproxiedProperty(in AString name);

  /**
   * An enumerator that lets us walk down the list of properties
   * that are actually changed by this proxy from the base.  If this
   * item is not a proxy, then this list will be equivalent to the one
   * returned from propertyEnumerator.
   *
   * The elements returned by the enumerator will be of type nsIProperty,
   * as with a normal nsIPropertyBag enumerator.
   */
  readonly attribute nsISimpleEnumerator unproxiedPropertyEnumerator;
};
