Module exchangelib.items

class AcceptItem(BaseMeetingReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/acceptitem"""

    ELEMENT_NAME = "AcceptItem"

class BaseItem(RegisterMixIn, metaclass=EWSMeta):
    """Base class for all other classes that implement EWS items."""

    ID_ELEMENT_CLS = ItemId
    _id = IdElementField(field_uri="item:ItemId", value_cls=ID_ELEMENT_CLS)

    __slots__ = "account", "folder"

    def __init__(self, **kwargs):
        """Pick out optional 'account' and 'folder' kwargs, and pass the rest to the parent class.

        :param kwargs:
            'account' is optional but allows calling 'send()' and 'delete()'
            'folder' is optional but allows calling 'save()'. If 'folder' has an account, and 'account' is not set,
                we use folder.account.
        """
        from ..account import Account
        from ..folders import BaseFolder

        self.account = kwargs.pop("account", None)
        if self.account is not None and not isinstance(self.account, Account):
            raise InvalidTypeError("account", self.account, Account)
        self.folder = kwargs.pop("folder", None)
        if self.folder is not None:
            if not isinstance(self.folder, BaseFolder):
                raise InvalidTypeError("folder", self.folder, BaseFolder)
            if self.folder.account is not None:
                if self.account is not None:
                    # Make sure the account from kwargs matches the folder account
                    if self.account != self.folder.account:
                        raise ValueError("'account' does not match 'folder.account'")
                self.account = self.folder.account
        super().__init__(**kwargs)

    @classmethod
    def from_xml(cls, elem, account):
        item = super().from_xml(elem=elem, account=account)
        item.account = account
        return item

class BulkCreateResult(BaseItem):
    """A dummy class to store return values from a CreateItem service call."""

    attachments = AttachmentField(field_uri="item:Attachments")  # ItemAttachment or FileAttachment

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if self.attachments is None:
            self.attachments = []

class CalendarItem(Item, AcceptDeclineMixIn):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/calendaritem"""

    ELEMENT_NAME = "CalendarItem"

    uid = TextField(field_uri="calendar:UID", is_required_after_save=True, is_searchable=False)
    recurrence_id = DateTimeField(field_uri="calendar:RecurrenceId", is_read_only=True)
    start = DateOrDateTimeField(field_uri="calendar:Start", is_required=True)
    end = DateOrDateTimeField(field_uri="calendar:End", is_required=True)
    original_start = DateTimeField(field_uri="calendar:OriginalStart", is_read_only=True)
    is_all_day = BooleanField(field_uri="calendar:IsAllDayEvent", is_required=True, default=False)
    legacy_free_busy_status = FreeBusyStatusField(
        field_uri="calendar:LegacyFreeBusyStatus", is_required=True, default="Busy"
    )
    location = TextField(field_uri="calendar:Location")
    when = TextField(field_uri="calendar:When")
    is_meeting = BooleanField(field_uri="calendar:IsMeeting", is_read_only=True)
    is_cancelled = BooleanField(field_uri="calendar:IsCancelled", is_read_only=True)
    is_recurring = BooleanField(field_uri="calendar:IsRecurring", is_read_only=True)
    meeting_request_was_sent = BooleanField(field_uri="calendar:MeetingRequestWasSent", is_read_only=True)
    is_response_requested = BooleanField(
        field_uri="calendar:IsResponseRequested", default=None, is_required_after_save=True, is_searchable=False
    )
    type = ChoiceField(
        field_uri="calendar:CalendarItemType", choices={Choice(c) for c in CALENDAR_ITEM_CHOICES}, is_read_only=True
    )
    my_response_type = ChoiceField(
        field_uri="calendar:MyResponseType", choices={Choice(c) for c in Attendee.RESPONSE_TYPES}, is_read_only=True
    )
    organizer = MailboxField(field_uri="calendar:Organizer", is_read_only=True)
    required_attendees = AttendeesField(field_uri="calendar:RequiredAttendees", is_searchable=False)
    optional_attendees = AttendeesField(field_uri="calendar:OptionalAttendees", is_searchable=False)
    resources = AttendeesField(field_uri="calendar:Resources", is_searchable=False)
    conflicting_meeting_count = IntegerField(field_uri="calendar:ConflictingMeetingCount", is_read_only=True)
    adjacent_meeting_count = IntegerField(field_uri="calendar:AdjacentMeetingCount", is_read_only=True)
    conflicting_meetings = EWSElementListField(
        field_uri="calendar:ConflictingMeetings", value_cls="CalendarItem", namespace=Item.NAMESPACE, is_read_only=True
    )
    adjacent_meetings = EWSElementListField(
        field_uri="calendar:AdjacentMeetings", value_cls="CalendarItem", namespace=Item.NAMESPACE, is_read_only=True
    )
    duration = CharField(field_uri="calendar:Duration", is_read_only=True)
    appointment_reply_time = DateTimeField(field_uri="calendar:AppointmentReplyTime", is_read_only=True)
    appointment_sequence_number = IntegerField(field_uri="calendar:AppointmentSequenceNumber", is_read_only=True)
    appointment_state = AppointmentStateField(field_uri="calendar:AppointmentState", is_read_only=True)
    recurrence = RecurrenceField(field_uri="calendar:Recurrence", is_searchable=False)
    first_occurrence = OccurrenceField(
        field_uri="calendar:FirstOccurrence", value_cls=FirstOccurrence, is_read_only=True
    )
    last_occurrence = OccurrenceField(field_uri="calendar:LastOccurrence", value_cls=LastOccurrence, is_read_only=True)
    modified_occurrences = OccurrenceListField(
        field_uri="calendar:ModifiedOccurrences", value_cls=Occurrence, is_read_only=True
    )
    deleted_occurrences = OccurrenceListField(
        field_uri="calendar:DeletedOccurrences", value_cls=DeletedOccurrence, is_read_only=True
    )
    _meeting_timezone = TimeZoneField(
        field_uri="calendar:MeetingTimeZone", deprecated_from=EXCHANGE_2010, is_searchable=False
    )
    _start_timezone = TimeZoneField(
        field_uri="calendar:StartTimeZone", supported_from=EXCHANGE_2010, is_searchable=False
    )
    _end_timezone = TimeZoneField(field_uri="calendar:EndTimeZone", supported_from=EXCHANGE_2010, is_searchable=False)
    conference_type = EnumAsIntField(
        field_uri="calendar:ConferenceType", enum=CONFERENCE_TYPES, min=0, default=None, is_required_after_save=True
    )
    allow_new_time_proposal = BooleanField(
        field_uri="calendar:AllowNewTimeProposal", default=None, is_required_after_save=True, is_searchable=False
    )
    is_online_meeting = BooleanField(field_uri="calendar:IsOnlineMeeting", default=None, is_read_only=True)
    meeting_workspace_url = URIField(field_uri="calendar:MeetingWorkspaceUrl")
    net_show_url = URIField(field_uri="calendar:NetShowUrl")

    def occurrence(self, index):
        """Get an occurrence of a recurring master by index. No query is sent to the server to actually fetch the item.
        Call refresh() on the item to do so.

        Only call this method on a recurring master.

        :param index: The index, which is 1-based

        :return The occurrence
        """
        return self.__class__(
            account=self.account,
            folder=self.folder,
            _id=OccurrenceItemId(id=self.id, changekey=self.changekey, instance_index=index),
        )

    def recurring_master(self):
        """Get the recurring master of an occurrence. No query is sent to the server to actually fetch the item.
        Call refresh() on the item to do so.

        Only call this method on an occurrence of a recurring master.

        :return: The master occurrence
        """
        return self.__class__(
            account=self.account,
            folder=self.folder,
            _id=RecurringMasterItemId(id=self.id, changekey=self.changekey),
        )

    @classmethod
    def timezone_fields(cls):
        return tuple(f for f in cls.FIELDS if isinstance(f, TimeZoneField))

    def clean_timezone_fields(self, version):
        # Sets proper values on the timezone fields if they are not already set
        if self.start is None:
            start_tz = None
        elif type(self.start) in (EWSDate, datetime.date):
            start_tz = self.account.default_timezone
        else:
            start_tz = self.start.tzinfo
        if self.end is None:
            end_tz = None
        elif type(self.end) in (EWSDate, datetime.date):
            end_tz = self.account.default_timezone
        else:
            end_tz = self.end.tzinfo
        if version.build < EXCHANGE_2010:
            if self._meeting_timezone is None:
                self._meeting_timezone = start_tz
            self._start_timezone = None
            self._end_timezone = None
        else:
            self._meeting_timezone = None
            if self._start_timezone is None:
                self._start_timezone = start_tz
            if self._end_timezone is None:
                self._end_timezone = end_tz

    def clean(self, version=None):
        super().clean(version=version)
        if self.start and self.end and self.end < self.start:
            raise ValueError(f"'end' must be greater than 'start' ({self.start} -> {self.end})")
        if version:
            self.clean_timezone_fields(version=version)

    def cancel(self, **kwargs):
        return CancelCalendarItem(
            account=self.account, reference_item_id=ReferenceItemId(id=self.id, changekey=self.changekey), **kwargs
        ).send()

    def _update_fieldnames(self):
        update_fields = super()._update_fieldnames()
        if self.type == OCCURRENCE:
            # Some CalendarItem fields cannot be updated when the item is an occurrence. The values are empty when we
            # receive them so would have been updated because they are set to None.
            update_fields.remove("recurrence")
            update_fields.remove("uid")
        return update_fields

    @classmethod
    def from_xml(cls, elem, account):
        item = super().from_xml(elem=elem, account=account)
        # EWS returns the start and end values as a datetime regardless of the is_all_day status. Convert to date if
        # applicable.
        if not item.is_all_day:
            return item
        for field_name in ("start", "end"):
            val = getattr(item, field_name)
            if val is None:
                continue
            # Return just the date part of the value. Subtract 1 day from the date if this is the end field. This is
            # the inverse of what we do in .to_xml(). Convert to the local timezone before getting the date.
            if field_name == "end":
                val -= datetime.timedelta(days=1)
            tz = getattr(item, f"_{field_name}_timezone")
            setattr(item, field_name, val.astimezone(tz).date())
        return item

    def tz_field_for_field_name(self, field_name):
        meeting_tz_field, start_tz_field, end_tz_field = CalendarItem.timezone_fields()
        if self.account.version.build < EXCHANGE_2010:
            return meeting_tz_field
        if field_name == "start":
            return start_tz_field
        if field_name == "end":
            return end_tz_field
        raise ValueError("Unsupported field_name")

    def date_to_datetime(self, field_name):
        # EWS always expects a datetime. If we have a date value, then convert it to datetime in the local
        # timezone. Additionally, if this the end field, add 1 day to the date. We could add 12 hours to both
        # start and end values and let EWS apply its logic, but that seems hacky.
        value = getattr(self, field_name)
        tz = getattr(self, self.tz_field_for_field_name(field_name).name)
        value = EWSDateTime.combine(value, datetime.time(0, 0)).replace(tzinfo=tz)
        if field_name == "end":
            value += datetime.timedelta(days=1)
        return value

    def to_xml(self, version):
        # EWS has some special logic related to all-day start and end values. Non-midnight start values are pushed to
        # the previous midnight. Non-midnight end values are pushed to the following midnight. Midnight in this context
        # refers to midnight in the local timezone. See
        #
        # https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-create-all-day-events-by-using-ews-in-exchange
        #
        elem = super().to_xml(version=version)
        if not self.is_all_day:
            return elem
        for field_name in ("start", "end"):
            value = getattr(self, field_name)
            if value is None:
                continue
            if type(value) in (EWSDate, datetime.date):
                # EWS always expects a datetime
                value = self.date_to_datetime(field_name=field_name)
                # We already generated an XML element for this field, but it contains a plain date at this point, which
                # is invalid. Replace the value.
                field = self.get_field_by_fieldname(field_name)
                set_xml_value(elem.find(field.response_tag()), value)
        return elem

class CancelCalendarItem(BaseReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/cancelcalendaritem"""

    ELEMENT_NAME = "CancelCalendarItem"
    author_idx = BaseReplyItem.FIELDS.index_by_name("author")
    FIELDS = BaseReplyItem.FIELDS[:author_idx] + BaseReplyItem.FIELDS[author_idx + 1 :]

class Contact(Item):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/contact"""

    ELEMENT_NAME = "Contact"

    file_as = TextField(field_uri="contacts:FileAs")
    file_as_mapping = ChoiceField(
        field_uri="contacts:FileAsMapping",
        choices={
            Choice("None"),
            Choice("LastCommaFirst"),
            Choice("FirstSpaceLast"),
            Choice("Company"),
            Choice("LastCommaFirstCompany"),
            Choice("CompanyLastFirst"),
            Choice("LastFirst"),
            Choice("LastFirstCompany"),
            Choice("CompanyLastCommaFirst"),
            Choice("LastFirstSuffix"),
            Choice("LastSpaceFirstCompany"),
            Choice("CompanyLastSpaceFirst"),
            Choice("LastSpaceFirst"),
            Choice("DisplayName"),
            Choice("FirstName"),
            Choice("LastFirstMiddleSuffix"),
            Choice("LastName"),
            Choice("Empty"),
        },
    )
    display_name = TextField(field_uri="contacts:DisplayName", is_required=True)
    given_name = CharField(field_uri="contacts:GivenName")
    initials = TextField(field_uri="contacts:Initials")
    middle_name = CharField(field_uri="contacts:MiddleName")
    nickname = TextField(field_uri="contacts:Nickname")
    complete_name = EWSElementField(field_uri="contacts:CompleteName", value_cls=CompleteName, is_read_only=True)
    company_name = TextField(field_uri="contacts:CompanyName")
    email_addresses = EmailAddressesField(field_uri="contacts:EmailAddress")
    physical_addresses = PhysicalAddressField(field_uri="contacts:PhysicalAddress")
    phone_numbers = PhoneNumberField(field_uri="contacts:PhoneNumber")
    assistant_name = TextField(field_uri="contacts:AssistantName")
    birthday = DateTimeBackedDateField(field_uri="contacts:Birthday", default_time=datetime.time(11, 59))
    business_homepage = URIField(field_uri="contacts:BusinessHomePage")
    children = TextListField(field_uri="contacts:Children")
    companies = TextListField(field_uri="contacts:Companies", is_searchable=False)
    contact_source = ChoiceField(
        field_uri="contacts:ContactSource", choices={Choice("Store"), Choice("ActiveDirectory")}, is_read_only=True
    )
    department = TextField(field_uri="contacts:Department")
    generation = TextField(field_uri="contacts:Generation")
    im_addresses = CharField(field_uri="contacts:ImAddresses", is_read_only=True)
    job_title = TextField(field_uri="contacts:JobTitle")
    manager = TextField(field_uri="contacts:Manager")
    mileage = TextField(field_uri="contacts:Mileage")
    office = TextField(field_uri="contacts:OfficeLocation")
    postal_address_index = ChoiceField(
        field_uri="contacts:PostalAddressIndex",
        choices={Choice("Business"), Choice("Home"), Choice("Other"), Choice("None")},
        default="None",
        is_required_after_save=True,
    )
    profession = TextField(field_uri="contacts:Profession")
    spouse_name = TextField(field_uri="contacts:SpouseName")
    surname = CharField(field_uri="contacts:Surname")
    wedding_anniversary = DateTimeBackedDateField(
        field_uri="contacts:WeddingAnniversary", default_time=datetime.time(11, 59)
    )
    has_picture = BooleanField(field_uri="contacts:HasPicture", supported_from=EXCHANGE_2010, is_read_only=True)
    phonetic_full_name = TextField(
        field_uri="contacts:PhoneticFullName", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    phonetic_first_name = TextField(
        field_uri="contacts:PhoneticFirstName", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    phonetic_last_name = TextField(
        field_uri="contacts:PhoneticLastName", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    email_alias = EmailAddressField(field_uri="contacts:Alias", is_read_only=True, supported_from=EXCHANGE_2010_SP2)
    # 'notes' is documented in MSDN but apparently unused. Writing to it raises ErrorInvalidPropertyRequest. OWA
    # put entries into the 'notes' form field into the 'body' field.
    notes = CharField(field_uri="contacts:Notes", supported_from=EXCHANGE_2010_SP2, is_read_only=True)
    # 'photo' is documented in MSDN but apparently unused. Writing to it raises ErrorInvalidPropertyRequest. OWA
    # adds photos as FileAttachments on the contact item (with 'is_contact_photo=True'), which automatically flips
    # the 'has_picture' field.
    photo = Base64Field(field_uri="contacts:Photo", supported_from=EXCHANGE_2010_SP2, is_read_only=True)
    user_smime_certificate = Base64Field(
        field_uri="contacts:UserSMIMECertificate", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    ms_exchange_certificate = Base64Field(
        field_uri="contacts:MSExchangeCertificate", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    directory_id = TextField(field_uri="contacts:DirectoryId", supported_from=EXCHANGE_2010_SP2, is_read_only=True)
    manager_mailbox = MailboxField(
        field_uri="contacts:ManagerMailbox", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    direct_reports = MailboxListField(
        field_uri="contacts:DirectReports", supported_from=EXCHANGE_2010_SP2, is_read_only=True
    )
    # O365 throws ErrorInternalServerError "[0x004f0102] MapiReplyToBlob" if UniqueBody is requested
    unique_body_idx = Item.FIELDS.index_by_name("unique_body")
    FIELDS = Item.FIELDS[:unique_body_idx] + Item.FIELDS[unique_body_idx + 1 :]

class DeclineItem(BaseMeetingReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/declineitem"""

    ELEMENT_NAME = "DeclineItem"

class DistributionList(Item):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/distributionlist"""

    ELEMENT_NAME = "DistributionList"

    display_name = CharField(field_uri="contacts:DisplayName", is_required=True)
    file_as = CharField(field_uri="contacts:FileAs", is_read_only=True)
    contact_source = ChoiceField(
        field_uri="contacts:ContactSource", choices={Choice("Store"), Choice("ActiveDirectory")}, is_read_only=True
    )
    members = MemberListField(field_uri="distributionlist:Members")

    # O365 throws ErrorInternalServerError "[0x004f0102] MapiReplyToBlob" if UniqueBody is requested
    unique_body_idx = Item.FIELDS.index_by_name("unique_body")
    FIELDS = Item.FIELDS[:unique_body_idx] + Item.FIELDS[unique_body_idx + 1 :]

class ForwardItem(BaseReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/forwarditem"""

    ELEMENT_NAME = "ForwardItem"

class Item(BaseItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/item"""

    ELEMENT_NAME = "Item"

    mime_content = MimeContentField(field_uri="item:MimeContent", is_read_only_after_send=True)
    _id = BaseItem.FIELDS["_id"]
    parent_folder_id = EWSElementField(field_uri="item:ParentFolderId", value_cls=ParentFolderId, is_read_only=True)
    item_class = CharField(field_uri="item:ItemClass", is_read_only=True)
    subject = CharField(field_uri="item:Subject")
    sensitivity = ChoiceField(
        field_uri="item:Sensitivity",
        choices={Choice("Normal"), Choice("Personal"), Choice("Private"), Choice("Confidential")},
        is_required=True,
        default="Normal",
    )
    text_body = TextField(field_uri="item:TextBody", is_read_only=True, supported_from=EXCHANGE_2013)
    body = BodyField(field_uri="item:Body")  # Accepts and returns Body or HTMLBody instances
    attachments = AttachmentField(field_uri="item:Attachments")  # ItemAttachment or FileAttachment
    datetime_received = DateTimeField(field_uri="item:DateTimeReceived", is_read_only=True)
    size = IntegerField(field_uri="item:Size", is_read_only=True)  # Item size in bytes
    categories = CharListField(field_uri="item:Categories")
    importance = ChoiceField(
        field_uri="item:Importance",
        choices={Choice("Low"), Choice("Normal"), Choice("High")},
        is_required=True,
        default="Normal",
    )
    in_reply_to = TextField(field_uri="item:InReplyTo")
    is_submitted = BooleanField(field_uri="item:IsSubmitted", is_read_only=True)
    is_draft = BooleanField(field_uri="item:IsDraft", is_read_only=True)
    is_from_me = BooleanField(field_uri="item:IsFromMe", is_read_only=True)
    is_resend = BooleanField(field_uri="item:IsResend", is_read_only=True)
    is_unmodified = BooleanField(field_uri="item:IsUnmodified", is_read_only=True)
    headers = MessageHeaderField(field_uri="item:InternetMessageHeaders", is_read_only=True)
    datetime_sent = DateTimeField(field_uri="item:DateTimeSent", is_read_only=True)
    datetime_created = DateTimeField(field_uri="item:DateTimeCreated", is_read_only=True)
    response_objects = EWSElementField(
        field_uri="item:ResponseObjects",
        value_cls=ResponseObjects,
        is_read_only=True,
    )
    # Placeholder for ResponseObjects
    reminder_due_by = DateTimeField(field_uri="item:ReminderDueBy", is_required_after_save=True, is_searchable=False)
    reminder_is_set = BooleanField(field_uri="item:ReminderIsSet", is_required=True, default=False)
    reminder_minutes_before_start = IntegerField(
        field_uri="item:ReminderMinutesBeforeStart", is_required_after_save=True, min=0, default=0
    )
    display_cc = TextField(field_uri="item:DisplayCc", is_read_only=True)
    display_to = TextField(field_uri="item:DisplayTo", is_read_only=True)
    has_attachments = BooleanField(field_uri="item:HasAttachments", is_read_only=True)
    # ExtendedProperty fields go here
    culture = CultureField(field_uri="item:Culture", is_required_after_save=True, is_searchable=False)
    effective_rights = EffectiveRightsField(field_uri="item:EffectiveRights", is_read_only=True)
    last_modified_name = CharField(field_uri="item:LastModifiedName", is_read_only=True)
    last_modified_time = DateTimeField(field_uri="item:LastModifiedTime", is_read_only=True)
    is_associated = BooleanField(field_uri="item:IsAssociated", is_read_only=True, supported_from=EXCHANGE_2010)
    web_client_read_form_query_string = URIField(
        field_uri="item:WebClientReadFormQueryString", is_read_only=True, supported_from=EXCHANGE_2010
    )
    web_client_edit_form_query_string = URIField(
        field_uri="item:WebClientEditFormQueryString", is_read_only=True, supported_from=EXCHANGE_2010
    )
    conversation_id = EWSElementField(
        field_uri="item:ConversationId", value_cls=ConversationId, is_read_only=True, supported_from=EXCHANGE_2010
    )
    unique_body = BodyField(field_uri="item:UniqueBody", is_read_only=True, supported_from=EXCHANGE_2010)

    FIELDS = Fields()

    # Used to register extended properties
    INSERT_AFTER_FIELD = "has_attachments"

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if self.attachments:
            for a in self.attachments:
                if a.parent_item:
                    if a.parent_item is not self:
                        raise ValueError(f"'parent_item' of attachment {a} must point to this item")
                else:
                    a.parent_item = self
                self.attach(self.attachments)
        else:
            self.attachments = []

    def save(self, update_fields=None, conflict_resolution=AUTO_RESOLVE, send_meeting_invitations=SEND_TO_NONE):
        from .task import Task

        if self.id:
            item_id, changekey = self._update(
                update_fieldnames=update_fields,
                message_disposition=SAVE_ONLY,
                conflict_resolution=conflict_resolution,
                send_meeting_invitations=send_meeting_invitations,
            )
            if (
                self.id != item_id
                and not isinstance(self._id, (OccurrenceItemId, RecurringMasterItemId))
                and not isinstance(self, Task)
            ):
                # When we update an item with an OccurrenceItemId as ID, EWS returns the ID of the occurrence, so
                # the ID of this item changes.
                #
                # When we update certain fields on a task, the ID may change. A full description is available at
                # https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/updateitem-operation-task
                raise ValueError("'id' mismatch in returned update response")
            # Don't check that changekeys are different. No-op saves will sometimes leave the changekey intact
            self._id = self.ID_ELEMENT_CLS(item_id, changekey)
        else:
            if update_fields:
                raise ValueError("'update_fields' is only valid for updates")
            tmp_attachments = None
            if self.account and self.account.version.build < EXCHANGE_2013 and self.attachments:
                # At least some versions prior to Exchange 2013 can't save attachments immediately. You need to first
                # save, then attach. Store the attachment of this item temporarily and attach later.
                tmp_attachments, self.attachments = self.attachments, []
            item = self._create(message_disposition=SAVE_ONLY, send_meeting_invitations=send_meeting_invitations)
            self._id = self.ID_ELEMENT_CLS(item.id, item.changekey)
            for old_att, new_att in zip(self.attachments, item.attachments):
                if old_att.attachment_id is not None:
                    raise ValueError("Old 'attachment_id' is not empty")
                if new_att.attachment_id is None:
                    raise ValueError("New 'attachment_id' is empty")
                old_att.attachment_id = new_att.attachment_id
            if tmp_attachments:
                # Exchange 2007 workaround. See above
                self.attach(tmp_attachments)
        return self

    @require_account
    def _create(self, message_disposition, send_meeting_invitations):
        # Return a BulkCreateResult because we want to return the ID of both the main item *and* attachments. In send
        # and send-and-save-copy mode, the server does not return an ID, so we just return True.
        from ..services import CreateItem

        return CreateItem(account=self.account).get(
            items=[self],
            folder=self.folder,
            message_disposition=message_disposition,
            send_meeting_invitations=send_meeting_invitations,
        )

    def _update_fieldnames(self):
        from .contact import Contact, DistributionList

        # Return the list of fields we are allowed to update
        update_fieldnames = []
        for f in self.supported_fields(version=self.account.version):
            if f.name == "attachments":
                # Attachments are handled separately after item creation
                continue
            if f.is_read_only:
                # These cannot be changed
                continue
            if (f.is_required or f.is_required_after_save) and (
                getattr(self, f.name) is None or (f.is_list and not getattr(self, f.name))
            ):
                # These are required and cannot be deleted
                continue
            if not self.is_draft and f.is_read_only_after_send:
                # These cannot be changed when the item is no longer a draft
                continue
            if f.name == "message_id" and f.is_read_only_after_send:
                # 'message_id' doesn't support updating, no matter the draft status
                continue
            if f.name == "mime_content" and isinstance(self, (Contact, DistributionList)):
                # Contact and DistributionList don't support updating mime_content, no matter the draft status
                continue
            update_fieldnames.append(f.name)
        return update_fieldnames

    @require_account
    def _update(self, update_fieldnames, message_disposition, conflict_resolution, send_meeting_invitations):
        from ..services import UpdateItem

        if not self.changekey:
            raise ValueError(f"{self.__class__.__name__} must have changekey")
        if not update_fieldnames:
            # The fields to update was not specified explicitly. Update all fields where update is possible
            update_fieldnames = self._update_fieldnames()
        return UpdateItem(account=self.account).get(
            items=[(self, update_fieldnames)],
            message_disposition=message_disposition,
            conflict_resolution=conflict_resolution,
            send_meeting_invitations_or_cancellations=send_meeting_invitations,
            suppress_read_receipts=True,
            expect_result=message_disposition != SEND_AND_SAVE_COPY,
        )

    @require_id
    def refresh(self):
        # Updates the item based on fresh data from EWS
        from ..services import GetItem

        additional_fields = {FieldPath(field=f) for f in self.supported_fields(version=self.account.version)}
        res = GetItem(account=self.account).get(items=[self], additional_fields=additional_fields, shape=ID_ONLY)
        if self.id != res.id and not isinstance(self._id, (OccurrenceItemId, RecurringMasterItemId)):
            # When we refresh an item with an OccurrenceItemId as ID, EWS returns the ID of the occurrence, so
            # the ID of this item changes.
            raise ValueError("'id' mismatch in returned update response")
        for f in self.FIELDS:
            setattr(self, f.name, getattr(res, f.name))
        # 'parent_item' should point to 'self', not 'fresh_item'. That way, 'fresh_item' can be garbage collected.
        for a in self.attachments:
            a.parent_item = self
        return self

    @require_id
    def copy(self, to_folder):
        from ..services import CopyItem

        # If 'to_folder' is a public folder or a folder in a different mailbox then None is returned
        return CopyItem(account=self.account).get(
            items=[self],
            to_folder=to_folder,
            expect_result=None,
        )

    @require_id
    def move(self, to_folder):
        from ..services import MoveItem

        res = MoveItem(account=self.account).get(
            items=[self],
            to_folder=to_folder,
            expect_result=None,
        )
        if res is None:
            # Assume 'to_folder' is a public folder or a folder in a different mailbox
            self._id = None
            return
        self._id = self.ID_ELEMENT_CLS(*res)
        self.folder = to_folder

    def move_to_trash(
        self,
        send_meeting_cancellations=SEND_TO_NONE,
        affected_task_occurrences=ALL_OCCURRENCES,
        suppress_read_receipts=True,
    ):
        # Delete and move to the trash folder.
        self._delete(
            delete_type=MOVE_TO_DELETED_ITEMS,
            send_meeting_cancellations=send_meeting_cancellations,
            affected_task_occurrences=affected_task_occurrences,
            suppress_read_receipts=suppress_read_receipts,
        )
        self._id = None
        self.folder = self.account.trash

    def soft_delete(
        self,
        send_meeting_cancellations=SEND_TO_NONE,
        affected_task_occurrences=ALL_OCCURRENCES,
        suppress_read_receipts=True,
    ):
        # Delete and move to the dumpster, if it is enabled.
        self._delete(
            delete_type=SOFT_DELETE,
            send_meeting_cancellations=send_meeting_cancellations,
            affected_task_occurrences=affected_task_occurrences,
            suppress_read_receipts=suppress_read_receipts,
        )
        self._id = None
        self.folder = self.account.recoverable_items_deletions

    def delete(
        self,
        send_meeting_cancellations=SEND_TO_NONE,
        affected_task_occurrences=ALL_OCCURRENCES,
        suppress_read_receipts=True,
    ):
        # Remove the item permanently. No copies are stored anywhere.
        self._delete(
            delete_type=HARD_DELETE,
            send_meeting_cancellations=send_meeting_cancellations,
            affected_task_occurrences=affected_task_occurrences,
            suppress_read_receipts=suppress_read_receipts,
        )
        self._id, self.folder = None, None

    @require_id
    def _delete(self, delete_type, send_meeting_cancellations, affected_task_occurrences, suppress_read_receipts):
        from ..services import DeleteItem

        DeleteItem(account=self.account).get(
            items=[self],
            delete_type=delete_type,
            send_meeting_cancellations=send_meeting_cancellations,
            affected_task_occurrences=affected_task_occurrences,
            suppress_read_receipts=suppress_read_receipts,
        )

    @require_id
    def archive(self, to_folder):
        from ..services import ArchiveItem

        return ArchiveItem(account=self.account).get(items=[self], to_folder=to_folder, expect_result=True)

    def attach(self, attachments):
        """Add an attachment, or a list of attachments, to this item. If the item has already been saved, the
        attachments will be created on the server immediately. If the item has not yet been saved, the attachments will
        be created on the server when the item is saved.

        Adding attachments to an existing item will update the changekey of the item.

        :param attachments:
        """
        if not is_iterable(attachments, generators_allowed=True):
            attachments = [attachments]
        for a in attachments:
            if not a.parent_item:
                a.parent_item = self
            if self.id and not a.attachment_id:
                # Already saved object. Attach the attachment server-side now
                a.attach()
            if a not in self.attachments:
                self.attachments.append(a)

    def detach(self, attachments):
        """Remove an attachment, or a list of attachments, from this item. If the item has already been saved, the
        attachments will be deleted on the server immediately. If the item has not yet been saved, the attachments will
        simply not be created on the server the item is saved.

        Removing attachments from an existing item will update the changekey of the item.

        :param attachments:
        """
        if not is_iterable(attachments, generators_allowed=True):
            attachments = [attachments]
        if attachments is self.attachments:
            # Don't remove from the same list we are iterating
            attachments = list(attachments)
        for a in attachments:
            if a.parent_item is not self:
                raise ValueError("Attachment does not belong to this item")
            if self.id:
                # Item is already created. Detach  the attachment server-side now
                a.detach()
            if a in self.attachments:
                self.attachments.remove(a)

    @require_id
    def create_forward(self, subject, body, to_recipients, cc_recipients=None, bcc_recipients=None):
        from .message import ForwardItem

        return ForwardItem(
            account=self.account,
            reference_item_id=ReferenceItemId(id=self.id, changekey=self.changekey),
            subject=subject,
            new_body=body,
            to_recipients=to_recipients,
            cc_recipients=cc_recipients,
            bcc_recipients=bcc_recipients,
        )

    def forward(self, subject, body, to_recipients, cc_recipients=None, bcc_recipients=None):
        return self.create_forward(
            subject,
            body,
            to_recipients,
            cc_recipients,
            bcc_recipients,
        ).send()

class MeetingCancellation(BaseMeetingItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingcancellation"""

    ELEMENT_NAME = "MeetingCancellation"

class MeetingRequest(BaseMeetingItem, AcceptDeclineMixIn):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingrequest"""

    ELEMENT_NAME = "MeetingRequest"

    meeting_request_type = ChoiceField(
        field_uri="meetingRequest:MeetingRequestType",
        choices={
            Choice("FullUpdate"),
            Choice("InformationalUpdate"),
            Choice("NewMeetingRequest"),
            Choice("None"),
            Choice("Outdated"),
            Choice("PrincipalWantsCopy"),
            Choice("SilentUpdate"),
        },
        default="None",
    )
    intended_free_busy_status = ChoiceField(
        field_uri="meetingRequest:IntendedFreeBusyStatus",
        choices={Choice("Free"), Choice("Tentative"), Choice("Busy"), Choice("OOF"), Choice("NoData")},
        is_required=True,
        default="Busy",
    )

    # This element also has some fields from CalendarItem
    start_idx = CalendarItem.FIELDS.index_by_name("start")
    is_response_requested_idx = CalendarItem.FIELDS.index_by_name("is_response_requested")
    FIELDS = (
        BaseMeetingItem.FIELDS
        + CalendarItem.FIELDS[start_idx:is_response_requested_idx]
        + CalendarItem.FIELDS[is_response_requested_idx + 1 :]
    )

class MeetingResponse(BaseMeetingItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/meetingresponse"""

    ELEMENT_NAME = "MeetingResponse"

    proposed_start = DateTimeField(field_uri="meeting:ProposedStart", supported_from=EXCHANGE_2013)
    proposed_end = DateTimeField(field_uri="meeting:ProposedEnd", supported_from=EXCHANGE_2013)

class Message(Item):
    """MSDN:
    https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/message-ex15websvcsotherref
    """

    ELEMENT_NAME = "Message"

    sender = MailboxField(field_uri="message:Sender", is_read_only=True, is_read_only_after_send=True)
    to_recipients = MailboxListField(
        field_uri="message:ToRecipients", is_read_only_after_send=True, is_searchable=False
    )
    cc_recipients = MailboxListField(
        field_uri="message:CcRecipients", is_read_only_after_send=True, is_searchable=False
    )
    bcc_recipients = MailboxListField(
        field_uri="message:BccRecipients", is_read_only_after_send=True, is_searchable=False
    )
    is_read_receipt_requested = BooleanField(
        field_uri="message:IsReadReceiptRequested", is_required=True, default=False, is_read_only_after_send=True
    )
    is_delivery_receipt_requested = BooleanField(
        field_uri="message:IsDeliveryReceiptRequested", is_required=True, default=False, is_read_only_after_send=True
    )
    conversation_index = Base64Field(field_uri="message:ConversationIndex", is_read_only=True)
    conversation_topic = CharField(field_uri="message:ConversationTopic", is_read_only=True)
    # Rename 'From' to 'author'. We can't use field name 'from' since it's a Python keyword.
    author = MailboxField(field_uri="message:From", is_read_only_after_send=True)
    message_id = TextField(field_uri="message:InternetMessageId", is_read_only_after_send=True)
    is_read = BooleanField(field_uri="message:IsRead", is_required=True, default=False)
    is_response_requested = BooleanField(field_uri="message:IsResponseRequested", default=False, is_required=True)
    references = TextField(field_uri="message:References")
    reply_to = MailboxListField(field_uri="message:ReplyTo", is_read_only_after_send=True, is_searchable=False)
    received_by = MailboxField(field_uri="message:ReceivedBy", is_read_only=True)
    received_representing = MailboxField(field_uri="message:ReceivedRepresenting", is_read_only=True)
    reminder_message_data = EWSElementField(
        field_uri="message:ReminderMessageData",
        value_cls=ReminderMessageData,
        supported_from=EXCHANGE_2013_SP1,
        is_read_only=True,
    )

    @require_account
    def send(
        self,
        save_copy=True,
        copy_to_folder=None,
        conflict_resolution=AUTO_RESOLVE,
        send_meeting_invitations=SEND_TO_NONE,
    ):
        from ..services import SendItem

        # Only sends a message. The message can either be an existing draft stored in EWS or a new message that does
        # not yet exist in EWS.
        if copy_to_folder and not save_copy:
            raise AttributeError("'save_copy' must be True when 'copy_to_folder' is set")
        if save_copy and not copy_to_folder:
            copy_to_folder = self.account.sent  # 'Sent' is default EWS behaviour
        if self.id:
            SendItem(account=self.account).get(items=[self], saved_item_folder=copy_to_folder)
            # The item will be deleted from the original folder
            self._id = None
            self.folder = copy_to_folder
            return None

        # New message
        if copy_to_folder:
            # This would better be done via send_and_save() but let's just support it here
            self.folder = copy_to_folder
            return self.send_and_save(
                conflict_resolution=conflict_resolution, send_meeting_invitations=send_meeting_invitations
            )

        if self.account.version.build < EXCHANGE_2013 and self.attachments:
            # At least some versions prior to Exchange 2013 can't send attachments immediately. You need to first save,
            # then attach, then send. This is done in send_and_save(). send() will delete the item again.
            self.send_and_save(
                conflict_resolution=conflict_resolution, send_meeting_invitations=send_meeting_invitations
            )
            return None

        self._create(message_disposition=SEND_ONLY, send_meeting_invitations=send_meeting_invitations)
        return None

    def send_and_save(
        self, update_fields=None, conflict_resolution=AUTO_RESOLVE, send_meeting_invitations=SEND_TO_NONE
    ):
        # Sends Message and saves a copy in the parent folder. Does not return an ItemId.
        if self.id:
            return self._update(
                update_fieldnames=update_fields,
                message_disposition=SEND_AND_SAVE_COPY,
                conflict_resolution=conflict_resolution,
                send_meeting_invitations=send_meeting_invitations,
            )
        if self.account.version.build < EXCHANGE_2013 and self.attachments:
            # At least some versions prior to Exchange 2013 can't send-and-save attachments immediately. You need
            # to first save, then attach, then send. This is done in save().
            self.save(
                update_fields=update_fields,
                conflict_resolution=conflict_resolution,
                send_meeting_invitations=send_meeting_invitations,
            )
            return self.send(
                save_copy=False,
                conflict_resolution=conflict_resolution,
                send_meeting_invitations=send_meeting_invitations,
            )
        return self._create(message_disposition=SEND_AND_SAVE_COPY, send_meeting_invitations=send_meeting_invitations)

    @require_id
    def create_reply(self, subject, body, to_recipients=None, cc_recipients=None, bcc_recipients=None, author=None):
        if not to_recipients:
            if not self.author:
                raise ValueError("'to_recipients' must be set when message has no 'author'")
            to_recipients = [self.author]
        return ReplyToItem(
            account=self.account,
            reference_item_id=ReferenceItemId(id=self.id, changekey=self.changekey),
            subject=subject,
            new_body=body,
            to_recipients=to_recipients,
            cc_recipients=cc_recipients,
            bcc_recipients=bcc_recipients,
            author=author,
        )

    def reply(self, subject, body, to_recipients=None, cc_recipients=None, bcc_recipients=None, author=None):
        return self.create_reply(subject, body, to_recipients, cc_recipients, bcc_recipients, author).send()

    @require_id
    def create_reply_all(self, subject, body, author=None):
        me = MailboxField().clean(self.account.primary_smtp_address.lower())
        to_recipients = set(self.to_recipients or [])
        to_recipients.discard(me)
        cc_recipients = set(self.cc_recipients or [])
        cc_recipients.discard(me)
        bcc_recipients = set(self.bcc_recipients or [])
        bcc_recipients.discard(me)
        if self.author:
            to_recipients.add(self.author)
        return ReplyAllToItem(
            account=self.account,
            reference_item_id=ReferenceItemId(id=self.id, changekey=self.changekey),
            subject=subject,
            new_body=body,
            to_recipients=list(to_recipients),
            cc_recipients=list(cc_recipients),
            bcc_recipients=list(bcc_recipients),
            author=author,
        )

    def reply_all(self, subject, body, author=None):
        return self.create_reply_all(subject, body, author).send()

    def mark_as_junk(self, is_junk=True, move_item=True):
        """Mark or un-marks items as junk email.

        :param is_junk: If True, the sender will be added from the blocked sender list. Otherwise, the sender will be
        removed.
        :param move_item: If true, the item will be moved to the junk folder.
        :return:
        """
        from ..services import MarkAsJunk

        res = MarkAsJunk(account=self.account).get(
            items=[self], is_junk=is_junk, move_item=move_item, expect_result=None
        )
        if res is None:
            return
        self.folder = self.account.junk if is_junk else self.account.inbox
        self.id, self.changekey = res

class Persona(IdChangeKeyMixIn):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/persona"""

    ELEMENT_NAME = "Persona"
    ID_ELEMENT_CLS = PersonaId

    _id = IdElementField(field_uri="persona:PersonaId", value_cls=ID_ELEMENT_CLS, namespace=TNS)
    persona_type = CharField(field_uri="persona:PersonaType")
    persona_object_type = TextField(field_uri="persona:PersonaObjectStatus")
    creation_time = DateTimeField(field_uri="persona:CreationTime")
    bodies = BodyContentAttributedValueField(field_uri="persona:Bodies")
    display_name_first_last_sort_key = TextField(field_uri="persona:DisplayNameFirstLastSortKey")
    display_name_last_first_sort_key = TextField(field_uri="persona:DisplayNameLastFirstSortKey")
    company_sort_key = TextField(field_uri="persona:CompanyNameSortKey")
    home_sort_key = TextField(field_uri="persona:HomeCitySortKey")
    work_city_sort_key = TextField(field_uri="persona:WorkCitySortKey")
    display_name_first_last_header = CharField(field_uri="persona:DisplayNameFirstLastHeader")
    display_name_last_first_header = CharField(field_uri="persona:DisplayNameLastFirstHeader")
    file_as_header = TextField(field_uri="persona:FileAsHeader")
    display_name = CharField(field_uri="persona:DisplayName")
    display_name_first_last = CharField(field_uri="persona:DisplayNameFirstLast")
    display_name_last_first = CharField(field_uri="persona:DisplayNameLastFirst")
    file_as = CharField(field_uri="persona:FileAs")
    file_as_id = TextField(field_uri="persona:FileAsId")
    display_name_prefix = CharField(field_uri="persona:DisplayNamePrefix")
    given_name = CharField(field_uri="persona:GivenName")
    middle_name = CharField(field_uri="persona:MiddleName")
    surname = CharField(field_uri="persona:Surname")
    generation = CharField(field_uri="persona:Generation")
    nickname = TextField(field_uri="persona:Nickname")
    yomi_company_name = TextField(field_uri="persona:YomiCompanyName")
    yomi_first_name = TextField(field_uri="persona:YomiFirstName")
    yomi_last_name = TextField(field_uri="persona:YomiLastName")
    title = CharField(field_uri="persona:Title")
    department = TextField(field_uri="persona:Department")
    company_name = CharField(field_uri="persona:CompanyName")
    email_address = EWSElementField(field_uri="persona:EmailAddress", value_cls=EmailAddress)
    email_addresses = EWSElementListField(field_uri="persona:EmailAddresses", value_cls=Address)
    PhoneNumber = PersonaPhoneNumberField(field_uri="persona:PhoneNumber")
    im_address = CharField(field_uri="persona:ImAddress")
    home_city = CharField(field_uri="persona:HomeCity")
    work_city = CharField(field_uri="persona:WorkCity")
    relevance_score = CharField(field_uri="persona:RelevanceScore")
    folder_ids = EWSElementListField(field_uri="persona:FolderIds", value_cls=FolderId)
    attributions = EWSElementListField(field_uri="persona:Attributions", value_cls=Attribution)
    display_names = StringAttributedValueField(field_uri="persona:DisplayNames")
    file_ases = StringAttributedValueField(field_uri="persona:FileAses")
    file_as_ids = StringAttributedValueField(field_uri="persona:FileAsIds")
    display_name_prefixes = StringAttributedValueField(field_uri="persona:DisplayNamePrefixes")
    given_names = StringAttributedValueField(field_uri="persona:GivenNames")
    middle_names = StringAttributedValueField(field_uri="persona:MiddleNames")
    surnames = StringAttributedValueField(field_uri="persona:Surnames")
    generations = StringAttributedValueField(field_uri="persona:Generations")
    nicknames = StringAttributedValueField(field_uri="persona:Nicknames")
    initials = StringAttributedValueField(field_uri="persona:Initials")
    yomi_company_names = StringAttributedValueField(field_uri="persona:YomiCompanyNames")
    yomi_first_names = StringAttributedValueField(field_uri="persona:YomiFirstNames")
    yomi_last_names = StringAttributedValueField(field_uri="persona:YomiLastNames")
    business_phone_numbers = PhoneNumberAttributedValueField(field_uri="persona:BusinessPhoneNumbers")
    business_phone_numbers2 = PhoneNumberAttributedValueField(field_uri="persona:BusinessPhoneNumbers2")
    home_phones = PhoneNumberAttributedValueField(field_uri="persona:HomePhones")
    home_phones2 = PhoneNumberAttributedValueField(field_uri="persona:HomePhones2")
    mobile_phones = PhoneNumberAttributedValueField(field_uri="persona:MobilePhones")
    mobile_phones2 = PhoneNumberAttributedValueField(field_uri="persona:MobilePhones2")
    assistant_phone_numbers = PhoneNumberAttributedValueField(field_uri="persona:AssistantPhoneNumbers")
    callback_phones = PhoneNumberAttributedValueField(field_uri="persona:CallbackPhones")
    car_phones = PhoneNumberAttributedValueField(field_uri="persona:CarPhones")
    home_faxes = PhoneNumberAttributedValueField(field_uri="persona:HomeFaxes")
    organization_main_phones = PhoneNumberAttributedValueField(field_uri="persona:OrganizationMainPhones")
    other_faxes = PhoneNumberAttributedValueField(field_uri="persona:OtherFaxes")
    other_telephones = PhoneNumberAttributedValueField(field_uri="persona:OtherTelephones")
    other_phones2 = PhoneNumberAttributedValueField(field_uri="persona:OtherPhones2")
    pagers = PhoneNumberAttributedValueField(field_uri="persona:Pagers")
    radio_phones = PhoneNumberAttributedValueField(field_uri="persona:RadioPhones")
    telex_numbers = PhoneNumberAttributedValueField(field_uri="persona:TelexNumbers")
    tty_tdd_phone_numbers = PhoneNumberAttributedValueField(field_uri="persona:TTYTDDPhoneNumbers")
    work_faxes = PhoneNumberAttributedValueField(field_uri="persona:WorkFaxes")
    emails1 = EmailAddressAttributedValueField(field_uri="persona:Emails1")
    emails2 = EmailAddressAttributedValueField(field_uri="persona:Emails2")
    emails3 = EmailAddressAttributedValueField(field_uri="persona:Emails3")
    business_home_pages = StringAttributedValueField(field_uri="persona:BusinessHomePages")
    personal_home_pages = StringAttributedValueField(field_uri="persona:PersonalHomePages")
    office_locations = StringAttributedValueField(field_uri="persona:OfficeLocations")
    im_addresses = StringAttributedValueField(field_uri="persona:ImAddresses")
    im_addresses2 = StringAttributedValueField(field_uri="persona:ImAddresses2")
    im_addresses3 = StringAttributedValueField(field_uri="persona:ImAddresses3")
    business_addresses = PostalAddressAttributedValueField(field_uri="persona:BusinessAddresses")
    home_addresses = PostalAddressAttributedValueField(field_uri="persona:HomeAddresses")
    other_addresses = PostalAddressAttributedValueField(field_uri="persona:OtherAddresses")
    titles = StringAttributedValueField(field_uri="persona:Titles")
    departments = StringAttributedValueField(field_uri="persona:Departments")
    company_names = StringAttributedValueField(field_uri="persona:CompanyNames")
    managers = StringAttributedValueField(field_uri="persona:Managers")
    assistant_names = StringAttributedValueField(field_uri="persona:AssistantNames")
    professions = StringAttributedValueField(field_uri="persona:Professions")
    spouse_names = StringAttributedValueField(field_uri="persona:SpouseNames")
    children = StringAttributedValueField(field_uri="persona:Children")
    schools = StringAttributedValueField(field_uri="persona:Schools")
    hobbies = StringAttributedValueField(field_uri="persona:Hobbies")
    wedding_anniversaries = StringAttributedValueField(field_uri="persona:WeddingAnniversaries")
    birthdays = StringAttributedValueField(field_uri="persona:Birthdays")
    locations = StringAttributedValueField(field_uri="persona:Locations")
    # This class has an additional field of type "ExtendedPropertyAttributedValueField" and
    # field_uri 'persona:ExtendedProperties'

class PostItem(Item):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/postitem"""

    ELEMENT_NAME = "PostItem"

    conversation_index = Message.FIELDS["conversation_index"]
    conversation_topic = Message.FIELDS["conversation_topic"]

    author = Message.FIELDS["author"]
    message_id = Message.FIELDS["message_id"]
    is_read = Message.FIELDS["is_read"]

    posted_time = DateTimeField(field_uri="postitem:PostedTime", is_read_only=True)
    references = TextField(field_uri="message:References")
    sender = MailboxField(field_uri="message:Sender", is_read_only=True, is_read_only_after_send=True)

class PostReplyItem(Item):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/postreplyitem"""

    ELEMENT_NAME = "PostReplyItem"

    # This element only has Item fields up to, and including, 'culture'
    # TDO: Plus all message fields
    new_body = BodyField(field_uri="NewBodyContent")  # Accepts and returns Body or HTMLBody instances

    culture_idx = Item.FIELDS.index_by_name("culture")
    sender_idx = Message.FIELDS.index_by_name("sender")
    FIELDS = Item.FIELDS[: culture_idx + 1] + Message.FIELDS[sender_idx:]

class RegisterMixIn(IdChangeKeyMixIn, metaclass=EWSMeta):
    """Base class for classes that can change their list of supported fields dynamically."""

    # This class implements dynamic fields on an element class, so we need to include __dict__ in __slots__
    __slots__ = ("__dict__",)

    INSERT_AFTER_FIELD = None

    @classmethod
    def register(cls, attr_name, attr_cls):
        """Register a custom extended property in this item class so they can be accessed just like any other attribute

        :param attr_name:
        :param attr_cls:
        :return:
        """
        if not cls.INSERT_AFTER_FIELD:
            raise ValueError(f"Class {cls} is missing INSERT_AFTER_FIELD value")
        try:
            cls.get_field_by_fieldname(attr_name)
        except InvalidField:
            pass
        else:
            raise ValueError(f"'attr_name' {attr_name!r} is already registered")
        if not issubclass(attr_cls, ExtendedProperty):
            raise TypeError(f"'attr_cls' {attr_cls!r} must be a subclass of type {ExtendedProperty}")
        # Check if class attributes are properly defined
        attr_cls.validate_cls()
        # ExtendedProperty is not a real field, but a placeholder in the fields list. See
        #   https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/item
        #
        # Find the correct index for the new extended property, and insert.
        if attr_cls.is_array_type():
            field = ExtendedPropertyListField(attr_name, value_cls=attr_cls)
        else:
            field = ExtendedPropertyField(attr_name, value_cls=attr_cls)
        cls.add_field(field, insert_after=cls.INSERT_AFTER_FIELD)

    @classmethod
    def deregister(cls, attr_name):
        """De-register an extended property that has been registered with register().

        :param attr_name:
        :return:
        """
        try:
            field = cls.get_field_by_fieldname(attr_name)
        except InvalidField:
            raise ValueError(f"{attr_name!r} is not registered")
        if not isinstance(field, ExtendedPropertyField):
            raise ValueError(f"{attr_name} is not registered as an ExtendedProperty")
        cls.remove_field(field)

class ReplyAllToItem(BaseReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/replyalltoitem"""

    ELEMENT_NAME = "ReplyAllToItem"

class ReplyToItem(BaseReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/replytoitem"""

    ELEMENT_NAME = "ReplyToItem"

class Task(Item):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/task"""

    ELEMENT_NAME = "Task"
    NOT_STARTED = "NotStarted"
    COMPLETED = "Completed"

    actual_work = IntegerField(field_uri="task:ActualWork", min=0)
    assigned_time = DateTimeField(field_uri="task:AssignedTime", is_read_only=True)
    billing_information = TextField(field_uri="task:BillingInformation")
    change_count = IntegerField(field_uri="task:ChangeCount", is_read_only=True, min=0)
    companies = TextListField(field_uri="task:Companies")
    # 'complete_date' can be set, but is ignored by the server, which sets it to now()
    complete_date = DateTimeField(field_uri="task:CompleteDate", is_read_only=True)
    contacts = TextListField(field_uri="task:Contacts")
    delegation_state = ChoiceField(
        field_uri="task:DelegationState",
        choices={
            Choice("NoMatch"),
            Choice("OwnNew"),
            Choice("Owned"),
            Choice("Accepted"),
            Choice("Declined"),
            Choice("Max"),
        },
        is_read_only=True,
    )
    delegator = CharField(field_uri="task:Delegator", is_read_only=True)
    due_date = DateTimeBackedDateField(field_uri="task:DueDate")
    is_editable = BooleanField(field_uri="task:IsAssignmentEditable", is_read_only=True)
    is_complete = BooleanField(field_uri="task:IsComplete", is_read_only=True)
    is_recurring = BooleanField(field_uri="task:IsRecurring", is_read_only=True)
    is_team_task = BooleanField(field_uri="task:IsTeamTask", is_read_only=True)
    mileage = TextField(field_uri="task:Mileage")
    owner = CharField(field_uri="task:Owner", is_read_only=True)
    percent_complete = DecimalField(
        field_uri="task:PercentComplete",
        is_required=True,
        default=Decimal(0.0),
        min=Decimal(0),
        max=Decimal(100),
        is_searchable=False,
    )
    recurrence = TaskRecurrenceField(field_uri="task:Recurrence", is_searchable=False)
    start_date = DateTimeBackedDateField(field_uri="task:StartDate")
    status = ChoiceField(
        field_uri="task:Status",
        choices={
            Choice(NOT_STARTED),
            Choice("InProgress"),
            Choice(COMPLETED),
            Choice("WaitingOnOthers"),
            Choice("Deferred"),
        },
        is_required=True,
        is_searchable=False,
        default=NOT_STARTED,
    )
    status_description = CharField(field_uri="task:StatusDescription", is_read_only=True)
    total_work = IntegerField(field_uri="task:TotalWork", min=0)

    # O365 throws ErrorInternalServerError "[0x004f0102] MapiReplyToBlob" if UniqueBody is requested
    unique_body_idx = Item.FIELDS.index_by_name("unique_body")
    FIELDS = Item.FIELDS[:unique_body_idx] + Item.FIELDS[unique_body_idx + 1 :]

    def clean(self, version=None):
        super().clean(version=version)
        if self.due_date and self.start_date and self.due_date < self.start_date:
            log.warning(
                "'due_date' must be greater than 'start_date' (%s vs %s). Resetting 'due_date'",
                self.due_date,
                self.start_date,
            )
            self.due_date = self.start_date
        if self.complete_date:
            if self.status != self.COMPLETED:
                log.warning(
                    "'status' must be '%s' when 'complete_date' is set (%s). Resetting", self.COMPLETED, self.status
                )
                self.status = self.COMPLETED
            now = datetime.datetime.now(tz=UTC)
            if (self.complete_date - now).total_seconds() > 120:
                # Reset complete_date values that are in the future
                # 'complete_date' can be set automatically by the server. Allow some grace between local and server time
                log.warning("'complete_date' must be in the past (%s vs %s). Resetting", self.complete_date, now)
                self.complete_date = now
            if self.start_date and self.complete_date.date() < self.start_date:
                log.warning(
                    "'complete_date' must be greater than 'start_date' (%s vs %s). Resetting",
                    self.complete_date,
                    self.start_date,
                )
                self.complete_date = EWSDateTime.combine(self.start_date, datetime.time(0, 0)).replace(tzinfo=UTC)
        if self.percent_complete is not None:
            if self.status == self.COMPLETED and self.percent_complete != Decimal(100):
                # percent_complete must be 100% if task is complete
                log.warning(
                    "'percent_complete' must be 100 when 'status' is '%s' (%s). Resetting",
                    self.COMPLETED,
                    self.percent_complete,
                )
                self.percent_complete = Decimal(100)
            elif self.status == self.NOT_STARTED and self.percent_complete != Decimal(0):
                # percent_complete must be 0% if task is not started
                log.warning(
                    "'percent_complete' must be 0 when 'status' is '%s' (%s). Resetting",
                    self.NOT_STARTED,
                    self.percent_complete,
                )
                self.percent_complete = Decimal(0)

    def complete(self):
        # A helper method to mark a task as complete on the server
        self.status = Task.COMPLETED
        self.percent_complete = Decimal(100)
        self.save()

class TentativelyAcceptItem(BaseMeetingReplyItem):
    """MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/tentativelyacceptitem"""

    ELEMENT_NAME = "TentativelyAcceptItem"