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// Copyright (c) 2023 xmpp-rs contributors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use std::io;
use std::path::{Path, PathBuf};
use std::sync::{Arc, RwLock};

use tokio::sync::{
    mpsc::{self, UnboundedReceiver, UnboundedSender},
    oneshot, Mutex,
};
use tokio_xmpp::connect::ServerConnector;
pub use tokio_xmpp::parsers;
use tokio_xmpp::parsers::{disco::DiscoInfoResult, message::MessageType};
pub use tokio_xmpp::{
    jid::{BareJid, FullJid, Jid},
    minidom::Element,
    AsyncClient as TokioXmppClient,
};

use crate::stream::{xml_stream_worker, IqRequest, IqResponse, NonTransactional, Request};
use crate::{message, muc, upload, Error, RoomNick};

#[derive(Debug)]
pub struct Agent {
    // pub(crate) client: TokioXmppClient<C>,
    boundjid: Jid,
    pub(crate) default_nick: Arc<RwLock<String>>,
    pub(crate) lang: Arc<Vec<String>>,
    pub(crate) disco: DiscoInfoResult,
    pub(crate) node: String,
    pub(crate) uploads: Vec<(String, Jid, PathBuf)>,
    pub(crate) awaiting_disco_bookmarks_type: bool,
    cmdq: UnboundedSender<Request>,
    miscq: Arc<Mutex<UnboundedReceiver<NonTransactional>>>,
}

impl Agent {
    pub(crate) fn new<C: ServerConnector>(
        client: TokioXmppClient<C>,
        default_nick: String,
        lang: Vec<String>,
        disco: DiscoInfoResult,
        node: String,
    ) -> Result<Agent, Error> {
        let (cmdtx, cmdrx) = mpsc::unbounded_channel();
        let (misctx, miscrx) = mpsc::unbounded_channel();
        let _ = tokio::spawn(xml_stream_worker(client, cmdrx, misctx));

        Ok(Agent {
            cmdq: cmdtx,
            miscq: Arc::new(Mutex::new(miscrx)),
            // client,
            boundjid: Jid::new("foo@bar/meh").unwrap(),
            default_nick: Arc::new(RwLock::new(default_nick)),
            lang: Arc::new(lang),
            disco,
            node,
            uploads: Vec::new(),
            awaiting_disco_bookmarks_type: false,
        })
    }

    pub async fn misc_receiver(&self) -> Arc<Mutex<UnboundedReceiver<NonTransactional>>> {
        Arc::clone(&self.miscq)
    }

    pub async fn send_stanza(&mut self, _stanza: Element) -> Result<(), Error> {
        Ok(())
    }

    pub async fn send_iq(&self, req: IqRequest) -> io::Result<IqResponse> {
        let (tx, rx) = oneshot::channel();
        let req = Request::SendIq {
            to: req.to,
            data: req.data,
            response: tx,
        };
        let _ = Ok::<(), io::Result<IqResponse>>(self.cmdq.send(req).unwrap());
        Ok(rx.await.unwrap()?)
    }

    pub async fn disconnect(&mut self) -> Result<(), Error> {
        let (tx, rx) = oneshot::channel();
        let req = Request::Disconnect { response: tx };
        let _ = Ok::<(), io::Error>(self.cmdq.send(req).unwrap());
        Ok(rx.await.unwrap()?)
    }

    /// Get the bound jid of the client.
    ///
    /// If the client is not connected, this will be None.
    pub fn bound_jid(&self) -> Option<&Jid> {
        Some(&self.boundjid)
    }

    pub async fn join_room(
        &mut self,
        room: BareJid,
        nick: Option<String>,
        password: Option<String>,
        lang: &str,
        status: &str,
    ) {
        muc::room::join_room(self, room, nick, password, lang, status).await
    }

    /// Request to leave a chatroom.
    ///
    /// If successful, an [Event::RoomLeft] event will be produced. This method does not remove the room
    /// from bookmarks nor remove the autojoin flag. See [muc::room::leave_room] for more information.
    ///
    /// # Arguments
    ///
    /// * `room_jid`: The JID of the room to leave.
    /// * `nickname`: The nickname to use in the room.
    /// * `lang`: The language of the status message (empty string when unknown).
    /// * `status`: The status message to send.
    pub async fn leave_room(
        &mut self,
        room_jid: BareJid,
        nickname: RoomNick,
        lang: impl Into<String>,
        status: impl Into<String>,
    ) {
        muc::room::leave_room(self, room_jid, nickname, lang, status).await
    }

    pub async fn send_message(
        &mut self,
        recipient: Jid,
        type_: MessageType,
        lang: &str,
        text: &str,
    ) {
        message::send::send_message(self, recipient, type_, lang, text).await
    }

    pub async fn send_room_private_message(
        &mut self,
        room: BareJid,
        recipient: RoomNick,
        lang: &str,
        text: &str,
    ) {
        muc::private_message::send_room_private_message(self, room, recipient, lang, text).await
    }

    pub async fn upload_file_with(&mut self, service: &str, path: &Path) {
        upload::send::upload_file_with(self, service, path).await
    }
}