actions::{Action, Action::*, Destination},

    protocol::messages::{HWProtocolMessage, HWServerMessage, HWServerMessage::*},

    #[inline]

    pub fn is_empty(&self) -> bool {

        self.messages.is_empty()

    }

    #[inline]

    pub fn len(&self) -> usize {

        self.messages.len()

    }

    #[inline]

    #[inline]

    pub fn extract_messages<'a, 'b: 'a>(

        &'b mut self,

        server: &'a HWServer,

    ) -> impl Iterator<Item = (Vec<ClientId>, HWServerMessage)> + 'a {

        let client_id = self.client_id;

        self.messages.drain(..).map(move |m| {

            let ids = get_recipients(server, client_id, &m.destination);

            (ids, m.message)

        })

    }

}

fn get_recipients(

    server: &HWServer,

    client_id: ClientId,

    destination: &Destination,

) -> Vec<ClientId> {

    let mut ids = match *destination {

        Destination::ToSelf => vec![client_id],

        Destination::ToId(id) => vec![id],

        Destination::ToAll {

            room_id: Some(id), ..

        } => server.room_clients(id),

        Destination::ToAll {

            protocol: Some(proto),

            ..

        } => server.protocol_clients(proto),

        Destination::ToAll { .. } => server.clients.iter().map(|(id, _)| id).collect::<Vec<_>>(),

    };

    if let Destination::ToAll {

        skip_self: true, ..

    } = destination

    {

        if let Some(index) = ids.iter().position(|id| *id == client_id) {

            ids.remove(index);

        }

    }

    ids

            //ByeClient("User quit: ".to_string() + &msg)

            //ByeClient("User quit".to_string())