//! Handling of all client2server presence stanzas

use quick_xml::events::Event;

use lavina_core::prelude::*;
use lavina_core::room::RoomId;
use proto_xmpp::bind::{Jid, Name, Server};
use proto_xmpp::client::Presence;
use proto_xmpp::xml::{Ignore, ToXml};

use crate::XmppConnection;

impl<'a> XmppConnection<'a> {
    pub async fn handle_presence(&mut self, output: &mut Vec<Event<'static>>, p: Presence<Ignore>) -> Result<()> {
        match p.to {
            None => {
                self.self_presence(output).await;
            }
            Some(Jid {
                name: Some(name),
                server,
                // resources in MUCs are members' personas – not implemented (yet?)
                resource: Some(_),
            }) if server.0 == self.hostname_rooms => {
                self.muc_presence(name, output).await?;
            }
            _ => {
                // TODO other presence cases
                let response = Presence::<()>::default();
                response.serialize(output);
            }
        }
        Ok(())
    }

    async fn self_presence(&mut self, output: &mut Vec<Event<'static>>) {
        let response = Presence::<()> {
            to: Some(Jid {
                name: Some(self.user.xmpp_name.clone()),
                server: Server(self.hostname.clone()),
                resource: Some(self.user.xmpp_resource.clone()),
            }),
            from: Some(Jid {
                name: Some(self.user.xmpp_name.clone()),
                server: Server(self.hostname.clone()),
                resource: Some(self.user.xmpp_resource.clone()),
            }),
            ..Default::default()
        };
        response.serialize(output);
    }

    async fn muc_presence(&mut self, name: Name, output: &mut Vec<Event<'static>>) -> Result<()> {
        let a = self.user_handle.join_room(RoomId::from(name.0.clone())?).await?;
        // TODO handle bans
        let response = Presence::<()> {
            to: Some(Jid {
                name: Some(self.user.xmpp_name.clone()),
                server: Server(self.hostname.clone()),
                resource: Some(self.user.xmpp_resource.clone()),
            }),
            from: Some(Jid {
                name: Some(name.clone()),
                server: Server(self.hostname_rooms.clone()),
                resource: Some(self.user.xmpp_muc_name.clone()),
            }),
            ..Default::default()
        };
        response.serialize(output);
        Ok(())
    }
}