# Source code for slixmpp.stanza.presence

    """
        Slixmpp: The Slick XMPP Library
        Copyright (C) 2010  Nathanael C. Fritz
        This file is part of Slixmpp.

        See the file LICENSE for copying permission.
    """

    from slixmpp.stanza.rootstanza import RootStanza
    from slixmpp.xmlstream import StanzaBase

    class Presence(RootStanza):

        """
        XMPP's <presence> stanza allows entities to know the status of other
        clients and components. Since it is currently the only multi-cast
        stanza in XMPP, many extensions add more information to <presence>
        stanzas to broadcast to every entry in the roster, such as
        capabilities, music choices, or locations (XEP-0115: Entity Capabilities
        and XEP-0163: Personal Eventing Protocol).

        Since <presence> stanzas are broadcast when an XMPP entity changes
        its status, the bulk of the traffic in an XMPP network will be from
        <presence> stanzas. Therefore, do not include more information than
        necessary in a status message or within a <presence> stanza in order
        to help keep the network running smoothly.

        Example <presence> stanzas:

        .. code-block:: xml

            <presence />

            <presence from="user@example.com">
              <show>away</show>
              <status>Getting lunch.</status>
              <priority>5</priority>
            </presence>

            <presence type="unavailable" />

            <presence to="user@otherhost.com" type="subscribe" />

        Stanza Interface:
            - **priority**: A value used by servers to determine message routing.
            - **show**: The type of status, such as away or available for chat.
            - **status**: Custom, human readable status message.

        Attributes:
            - **types**: One of: available, unavailable, error, probe,
              subscribe, subscribed, unsubscribe, and unsubscribed.
            - **showtypes**: One of: away, chat, dnd, and xa.
        """

        name = 'presence'
        namespace = 'jabber:client'
        plugin_attrib = name
        interfaces = set(['type', 'to', 'from', 'id', 'show',
                          'status', 'priority'])
        sub_interfaces = set(['show', 'status', 'priority'])
        lang_interfaces = set(['status'])

        types = set(['available', 'unavailable', 'error', 'probe', 'subscribe',
                     'subscribed', 'unsubscribe', 'unsubscribed'])
        showtypes = set(['dnd', 'chat', 'xa', 'away'])

        def __init__(self, *args, **kwargs):
            """
            Initialize a new <presence /> stanza with an optional 'id' value.

            Overrides StanzaBase.__init__.
            """
            StanzaBase.__init__(self, *args, **kwargs)
            if self['id'] == '':
                if self.stream is not None and self.stream.use_presence_ids:
                    self['id'] = self.stream.new_id()

        def exception(self, e):
            """
            Override exception passback for presence.
            """
            pass

        def set_show(self, show):
            """
            Set the value of the <show> element.

            :param str show: Must be one of: away, chat, dnd, or xa.
            """
            if show is None:
                self._del_sub('show')
            elif show in self.showtypes:
                self._set_sub_text('show', text=show)
            return self

        def get_type(self):
            """
            Return the value of the <presence> stanza's type attribute, or
            the value of the <show> element.
            """
            out = self._get_attr('type')
            if not out:
                out = self['show']
            if not out or out is None:
                out = 'available'
            return out

        def set_type(self, value):
            """
            Set the type attribute's value, and the <show> element
            if applicable.

            :param str value: Must be in either self.types or self.showtypes.
            """
            if value in self.types:
                self['show'] = None
                if value == 'available':
                    value = ''
                self._set_attr('type', value)
            elif value in self.showtypes:
                self['show'] = value
            return self

        def del_type(self):
            """
            Remove both the type attribute and the <show> element.
            """
            self._del_attr('type')
            self._del_sub('show')

        def set_priority(self, value):
            """
            Set the entity's priority value. Some server use priority to
            determine message routing behavior.

            Bot clients should typically use a priority of 0 if the same
            JID is used elsewhere by a human-interacting client.

            :param int value: An integer value greater than or equal to 0.
            """
            self._set_sub_text('priority', text=str(value))

        def get_priority(self):
            """
            Return the value of the <presence> element as an integer.

            :rtype: int
            """
            p = self._get_sub_text('priority')
            if not p:
                p = 0
            try:
                return int(p)
            except ValueError:
                # The priority is not a number: we consider it 0 as a default
                return 0

        def reply(self, clear=True):
            """
            Create a new reply <presence/> stanza from ``self``.

            Overrides StanzaBase.reply.

            :param bool clear: Indicates if the stanza contents should be removed
                               before replying. Defaults to True.
            """
            new_presence = StanzaBase.reply(self, clear)
            if self['type'] == 'unsubscribe':
                new_presence['type'] = 'unsubscribed'
            elif self['type'] == 'subscribe':
                new_presence['type'] = 'subscribed'
            return new_presence