client.rs

use async_trait::async_trait;
use bytes::Bytes;
#[cfg(not(any(target_os = "android", target_os = "ios")))]
use clipboard_master::{CallbackResult, ClipboardHandler};
#[cfg(not(any(target_os = "android", target_os = "linux")))]
use cpal::{
    traits::{DeviceTrait, HostTrait, StreamTrait},
    Device, Host, StreamConfig,
};
use crossbeam_queue::ArrayQueue;
use magnum_opus::{Channels::*, Decoder as AudioDecoder};
#[cfg(not(any(target_os = "android", target_os = "linux")))]
use ringbuf::{ring_buffer::RbBase, Rb};
use sha2::{Digest, Sha256};
use std::{
    collections::HashMap,
    ffi::c_void,
    io,
    net::SocketAddr,
    ops::Deref,
    str::FromStr,
    sync::{
        mpsc::{self, RecvTimeoutError, Sender},
        Arc, Mutex, RwLock,
    },
};
use uuid::Uuid;

pub use file_trait::FileManager;
#[cfg(not(feature = "flutter"))]
#[cfg(not(any(target_os = "android", target_os = "ios")))]
use hbb_common::tokio::sync::mpsc::UnboundedSender;
use hbb_common::tokio::sync::mpsc::{unbounded_channel, UnboundedReceiver};
use hbb_common::{
    allow_err,
    anyhow::{anyhow, Context},
    bail,
    config::{
        self, Config, LocalConfig, PeerConfig, PeerInfoSerde, Resolution, CONNECT_TIMEOUT,
        PUBLIC_RS_PUB_KEY, READ_TIMEOUT, RELAY_PORT, RENDEZVOUS_PORT, RENDEZVOUS_SERVERS,
    },
    get_version_number, log,
    message_proto::{option_message::BoolOption, *},
    protobuf::{Message as _, MessageField},
    rand,
    rendezvous_proto::*,
    socket_client::{connect_tcp, connect_tcp_local, ipv4_to_ipv6},
    sodiumoxide::{base64, crypto::sign},
    tcp::FramedStream,
    timeout,
    tokio::{
        self,
        time::{interval, Duration, Instant},
    },
    AddrMangle, ResultType, Stream,
};
pub use helper::*;
use scrap::{
    codec::Decoder,
    record::{Recorder, RecorderContext},
    CodecFormat, ImageFormat, ImageRgb,
};

use crate::{
    check_port,
    common::input::{MOUSE_BUTTON_LEFT, MOUSE_BUTTON_RIGHT, MOUSE_TYPE_DOWN, MOUSE_TYPE_UP},
    create_symmetric_key_msg, decode_id_pk, get_rs_pk, is_keyboard_mode_supported, secure_tcp,
    ui_interface::{get_builtin_option, use_texture_render},
    ui_session_interface::{InvokeUiSession, Session},
};

#[cfg(not(any(target_os = "android", target_os = "ios")))]
use crate::clipboard::{check_clipboard, ClipboardSide, CLIPBOARD_INTERVAL};
#[cfg(not(feature = "flutter"))]
#[cfg(not(any(target_os = "android", target_os = "ios")))]
use crate::ui_session_interface::SessionPermissionConfig;

pub use super::lang::*;

pub mod file_trait;
pub mod helper;
pub mod io_loop;

pub const MILLI1: Duration = Duration::from_millis(1);
pub const SEC30: Duration = Duration::from_secs(30);
pub const VIDEO_QUEUE_SIZE: usize = 120;
const MAX_DECODE_FAIL_COUNTER: usize = 3;

#[cfg(target_os = "linux")]
pub const LOGIN_MSG_DESKTOP_NOT_INITED: &str = "Desktop env is not inited";
pub const LOGIN_MSG_DESKTOP_SESSION_NOT_READY: &str = "Desktop session not ready";
pub const LOGIN_MSG_DESKTOP_XSESSION_FAILED: &str = "Desktop xsession failed";
pub const LOGIN_MSG_DESKTOP_SESSION_ANOTHER_USER: &str = "Desktop session another user login";
pub const LOGIN_MSG_DESKTOP_XORG_NOT_FOUND: &str = "Desktop xorg not found";
// ls /usr/share/xsessions/
pub const LOGIN_MSG_DESKTOP_NO_DESKTOP: &str = "Desktop none";
pub const LOGIN_MSG_DESKTOP_SESSION_NOT_READY_PASSWORD_EMPTY: &str =
    "Desktop session not ready, password empty";
pub const LOGIN_MSG_DESKTOP_SESSION_NOT_READY_PASSWORD_WRONG: &str =
    "Desktop session not ready, password wrong";
pub const LOGIN_MSG_PASSWORD_EMPTY: &str = "Empty Password";
pub const LOGIN_MSG_PASSWORD_WRONG: &str = "Wrong Password";
pub const LOGIN_MSG_2FA_WRONG: &str = "Wrong 2FA Code";
pub const REQUIRE_2FA: &'static str = "2FA Required";
pub const LOGIN_MSG_NO_PASSWORD_ACCESS: &str = "No Password Access";
pub const LOGIN_MSG_OFFLINE: &str = "Offline";
pub const LOGIN_SCREEN_WAYLAND: &str = "Wayland login screen is not supported";
#[cfg(target_os = "linux")]
pub const SCRAP_UBUNTU_HIGHER_REQUIRED: &str = "Wayland requires Ubuntu 21.04 or higher version.";
#[cfg(target_os = "linux")]
pub const SCRAP_OTHER_VERSION_OR_X11_REQUIRED: &str =
    "Wayland requires higher version of linux distro. Please try X11 desktop or change your OS.";
pub const SCRAP_X11_REQUIRED: &str = "x11 expected";
pub const SCRAP_X11_REF_URL: &str = "https://rustdesk.com/docs/en/manual/linux/#x11-required";

#[cfg(not(any(target_os = "android", target_os = "linux")))]
pub const AUDIO_BUFFER_MS: usize = 150;

#[cfg(feature = "flutter")]
#[cfg(not(any(target_os = "android", target_os = "ios")))]
pub(crate) struct ClientClipboardContext;

#[cfg(not(feature = "flutter"))]
#[cfg(not(any(target_os = "android", target_os = "ios")))]
pub(crate) struct ClientClipboardContext {
    pub cfg: SessionPermissionConfig,
    pub tx: UnboundedSender<Data>,
}

/// Client of the remote desktop.
pub struct Client;

#[cfg(not(any(target_os = "android", target_os = "ios")))]
struct TextClipboardState {
    is_required: bool,
    running: bool,
}

#[cfg(not(any(target_os = "android", target_os = "linux")))]
lazy_static::lazy_static! {
    static ref AUDIO_HOST: Host = cpal::default_host();
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
lazy_static::lazy_static! {
    static ref ENIGO: Arc<Mutex<enigo::Enigo>> = Arc::new(Mutex::new(enigo::Enigo::new()));
    static ref TEXT_CLIPBOARD_STATE: Arc<Mutex<TextClipboardState>> = Arc::new(Mutex::new(TextClipboardState::new()));
}

const PUBLIC_SERVER: &str = "public";

#[cfg(not(any(target_os = "android", target_os = "ios")))]
pub fn get_key_state(key: enigo::Key) -> bool {
    use enigo::KeyboardControllable;
    #[cfg(target_os = "macos")]
    if key == enigo::Key::NumLock {
        return true;
    }
    ENIGO.lock().unwrap().get_key_state(key)
}

cfg_if::cfg_if! {
    if #[cfg(target_os = "android")] {

use hbb_common::libc::{c_float, c_int};
type Oboe = *mut c_void;
extern "C" {
    fn create_oboe_player(channels: c_int, sample_rate: c_int) -> Oboe;
    fn push_oboe_data(oboe: Oboe, d: *const c_float, n: c_int);
    fn destroy_oboe_player(oboe: Oboe);
}

struct OboePlayer {
    raw: Oboe,
}

impl Default for OboePlayer {
    fn default() -> Self {
        Self {
            raw: std::ptr::null_mut(),
        }
    }
}

impl OboePlayer {
    fn new(channels: i32, sample_rate: i32) -> Self {
        unsafe {
            Self {
                raw: create_oboe_player(channels, sample_rate),
            }
        }
    }

    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    fn is_null(&self) -> bool {
        self.raw.is_null()
    }

    fn push(&mut self, d: &[f32]) {
        if self.raw.is_null() {
            return;
        }
        unsafe {
            push_oboe_data(self.raw, d.as_ptr(), d.len() as _);
        }
    }
}

impl Drop for OboePlayer {
    fn drop(&mut self) {
        unsafe {
            if !self.raw.is_null() {
                destroy_oboe_player(self.raw);
            }
        }
    }
}

}
}

impl Client {
    /// Start a new connection.
    pub async fn start(
        peer: &str,
        key: &str,
        token: &str,
        conn_type: ConnType,
        interface: impl Interface,
    ) -> ResultType<((Stream, bool, Option<Vec<u8>>), (i32, String))> {
        debug_assert!(peer == interface.get_id());
        interface.update_direct(None);
        interface.update_received(false);
        match Self::_start(peer, key, token, conn_type, interface).await {
            Err(err) => {
                let err_str = err.to_string();
                if err_str.starts_with("Failed") {
                    bail!(err_str + ": Please try later");
                } else {
                    return Err(err);
                }
            }
            Ok(x) => Ok(x),
        }
    }

    /// Start a new connection.
    async fn _start(
        peer: &str,
        key: &str,
        token: &str,
        conn_type: ConnType,
        interface: impl Interface,
    ) -> ResultType<((Stream, bool, Option<Vec<u8>>), (i32, String))> {
        if config::is_incoming_only() {
            bail!("Incoming only mode");
        }
        // to-do: remember the port for each peer, so that we can retry easier
        if hbb_common::is_ip_str(peer) {
            return Ok((
                (
                    connect_tcp(check_port(peer, RELAY_PORT + 1), CONNECT_TIMEOUT).await?,
                    true,
                    None,
                ),
                (0, "".to_owned()),
            ));
        }
        // Allow connect to {domain}:{port}
        if hbb_common::is_domain_port_str(peer) {
            return Ok((
                (connect_tcp(peer, CONNECT_TIMEOUT).await?, true, None),
                (0, "".to_owned()),
            ));
        }

        let other_server = interface.get_lch().read().unwrap().other_server.clone();
        let (peer, other_server, key, token) = if let Some((a, b, c)) = other_server.as_ref() {
            (a.as_ref(), b.as_ref(), c.as_ref(), "")
        } else {
            (peer, "", key, token)
        };
        let (mut rendezvous_server, servers, contained) = if other_server.is_empty() {
            crate::get_rendezvous_server(1_000).await
        } else {
            if other_server == PUBLIC_SERVER {
                (
                    check_port(RENDEZVOUS_SERVERS[0], RENDEZVOUS_PORT),
                    RENDEZVOUS_SERVERS[1..]
                        .iter()
                        .map(|x| x.to_string())
                        .collect(),
                    true,
                )
            } else {
                (check_port(other_server, RENDEZVOUS_PORT), Vec::new(), true)
            }
        };

        let mut socket = connect_tcp(&*rendezvous_server, CONNECT_TIMEOUT).await;
        debug_assert!(!servers.contains(&rendezvous_server));
        if socket.is_err() && !servers.is_empty() {
            log::info!("try the other servers: {:?}", servers);
            for server in servers {
                let server = check_port(server, RENDEZVOUS_PORT);
                socket = connect_tcp(&*server, CONNECT_TIMEOUT).await;
                if socket.is_ok() {
                    rendezvous_server = server;
                    break;
                }
            }
            crate::refresh_rendezvous_server();
        } else if !contained {
            crate::refresh_rendezvous_server();
        }
        log::info!("rendezvous server: {}", rendezvous_server);
        let mut socket = socket?;
        let my_addr = socket.local_addr();
        let mut signed_id_pk = Vec::new();
        let mut relay_server = "".to_owned();

        if !key.is_empty() && !token.is_empty() {
            // mainly for the security of token
            allow_err!(secure_tcp(&mut socket, key).await);
        }

        let start = std::time::Instant::now();
        let mut peer_addr = Config::get_any_listen_addr(true);
        let mut peer_nat_type = NatType::UNKNOWN_NAT;
        let my_nat_type = crate::get_nat_type(100).await;
        let mut is_local = false;
        let mut feedback = 0;
        for i in 1..=3 {
            log::info!("#{} punch attempt with {}, id: {}", i, my_addr, peer);
            let mut msg_out = RendezvousMessage::new();
            use hbb_common::protobuf::Enum;
            let nat_type = if interface.is_force_relay() {
                NatType::SYMMETRIC
            } else {
                NatType::from_i32(my_nat_type).unwrap_or(NatType::UNKNOWN_NAT)
            };
            msg_out.set_punch_hole_request(PunchHoleRequest {
                id: peer.to_owned(),
                token: token.to_owned(),
                nat_type: nat_type.into(),
                licence_key: key.to_owned(),
                conn_type: conn_type.into(),
                version: crate::VERSION.to_owned(),
                ..Default::default()
            });
            socket.send(&msg_out).await?;
            // below timeout should not bigger than hbbs's connection timeout.
            if let Some(msg_in) =
                crate::get_next_nonkeyexchange_msg(&mut socket, Some(i * 6000)).await
            {
                match msg_in.union {
                    Some(rendezvous_message::Union::PunchHoleResponse(ph)) => {
                        if ph.socket_addr.is_empty() {
                            if !ph.other_failure.is_empty() {
                                bail!(ph.other_failure);
                            }
                            match ph.failure.enum_value() {
                                Ok(punch_hole_response::Failure::ID_NOT_EXIST) => {
                                    bail!("ID does not exist");
                                }
                                Ok(punch_hole_response::Failure::OFFLINE) => {
                                    bail!("Remote desktop is offline");
                                }
                                Ok(punch_hole_response::Failure::LICENSE_MISMATCH) => {
                                    bail!("Key mismatch");
                                }
                                Ok(punch_hole_response::Failure::LICENSE_OVERUSE) => {
                                    bail!("Key overuse");
                                }
                                _ => bail!("other punch hole failure"),
                            }
                        } else {
                            peer_nat_type = ph.nat_type();
                            is_local = ph.is_local();
                            signed_id_pk = ph.pk.into();
                            relay_server = ph.relay_server;
                            peer_addr = AddrMangle::decode(&ph.socket_addr);
                            feedback = ph.feedback;
                            log::info!("Hole Punched {} = {}", peer, peer_addr);
                            break;
                        }
                    }
                    Some(rendezvous_message::Union::RelayResponse(rr)) => {
                        log::info!(
                            "relay requested from peer, time used: {:?}, relay_server: {}",
                            start.elapsed(),
                            rr.relay_server
                        );
                        signed_id_pk = rr.pk().into();
                        let mut conn = Self::create_relay(
                            peer,
                            rr.uuid,
                            rr.relay_server,
                            key,
                            conn_type,
                            my_addr.is_ipv4(),
                        )
                        .await?;
                        feedback = rr.feedback;
                        let pk =
                            Self::secure_connection(peer, signed_id_pk, key, &mut conn).await?;
                        return Ok(((conn, false, pk), (feedback, rendezvous_server)));
                    }
                    _ => {
                        log::error!("Unexpected protobuf msg received: {:?}", msg_in);
                    }
                }
            }
        }
        drop(socket);
        if peer_addr.port() == 0 {
            bail!("Failed to connect via rendezvous server");
        }
        let time_used = start.elapsed().as_millis() as u64;
        log::info!(
            "{} ms used to punch hole, relay_server: {}, {}",
            time_used,
            relay_server,
            if is_local {
                "is_local: true".to_owned()
            } else {
                format!("nat_type: {:?}", peer_nat_type)
            }
        );
        Ok((
            Self::connect(
                my_addr,
                peer_addr,
                peer,
                signed_id_pk,
                &relay_server,
                &rendezvous_server,
                time_used,
                peer_nat_type,
                my_nat_type,
                is_local,
                key,
                token,
                conn_type,
                interface,
            )
            .await?,
            (feedback, rendezvous_server),
        ))
    }

    /// Connect to the peer.
    async fn connect(
        local_addr: SocketAddr,
        peer: SocketAddr,
        peer_id: &str,
        signed_id_pk: Vec<u8>,
        relay_server: &str,
        rendezvous_server: &str,
        punch_time_used: u64,
        peer_nat_type: NatType,
        my_nat_type: i32,
        is_local: bool,
        key: &str,
        token: &str,
        conn_type: ConnType,
        interface: impl Interface,
    ) -> ResultType<(Stream, bool, Option<Vec<u8>>)> {
        let direct_failures = interface.get_lch().read().unwrap().direct_failures;
        let mut connect_timeout = 0;
        const MIN: u64 = 1000;
        if is_local || peer_nat_type == NatType::SYMMETRIC {
            connect_timeout = MIN;
        } else {
            if relay_server.is_empty() {
                connect_timeout = CONNECT_TIMEOUT;
            } else {
                if peer_nat_type == NatType::ASYMMETRIC {
                    let mut my_nat_type = my_nat_type;
                    if my_nat_type == NatType::UNKNOWN_NAT as i32 {
                        my_nat_type = crate::get_nat_type(100).await;
                    }
                    if my_nat_type == NatType::ASYMMETRIC as i32 {
                        connect_timeout = CONNECT_TIMEOUT;
                        if direct_failures > 0 {
                            connect_timeout = punch_time_used * 6;
                        }
                    } else if my_nat_type == NatType::SYMMETRIC as i32 {
                        connect_timeout = MIN;
                    }
                }
                if connect_timeout == 0 {
                    let n = if direct_failures > 0 { 3 } else { 6 };
                    connect_timeout = punch_time_used * (n as u64);
                }
            }
            if connect_timeout < MIN {
                connect_timeout = MIN;
            }
        }
        log::info!("peer address: {}, timeout: {}", peer, connect_timeout);
        let start = std::time::Instant::now();
        // NOTICE: Socks5 is be used event in intranet. Which may be not a good way.
        let mut conn = connect_tcp_local(peer, Some(local_addr), connect_timeout).await;
        let mut direct = !conn.is_err();
        interface.update_direct(Some(direct));
        if interface.is_force_relay() || conn.is_err() {
            if !relay_server.is_empty() {
                conn = Self::request_relay(
                    peer_id,
                    relay_server.to_owned(),
                    rendezvous_server,
                    !signed_id_pk.is_empty(),
                    key,
                    token,
                    conn_type,
                )
                .await;
                interface.update_direct(Some(false));
                if let Err(e) = conn {
                    bail!("Failed to connect via relay server: {}", e);
                }
                direct = false;
            } else {
                bail!("Failed to make direct connection to remote desktop");
            }
        }
        if !relay_server.is_empty() && (direct_failures == 0) != direct {
            let n = if direct { 0 } else { 1 };
            log::info!("direct_failures updated to {}", n);
            interface.get_lch().write().unwrap().set_direct_failure(n);
        }
        let mut conn = conn?;
        log::info!("{:?} used to establish connection", start.elapsed());
        let pk = Self::secure_connection(peer_id, signed_id_pk, key, &mut conn).await?;
        Ok((conn, direct, pk))
    }

    /// Establish secure connection with the server.
    async fn secure_connection(
        peer_id: &str,
        signed_id_pk: Vec<u8>,
        key: &str,
        conn: &mut Stream,
    ) -> ResultType<Option<Vec<u8>>> {
        let rs_pk = get_rs_pk(if key.is_empty() {
            config::RS_PUB_KEY
        } else {
            key
        });
        let mut sign_pk = None;
        let mut option_pk = None;
        if !signed_id_pk.is_empty() {
            if let Some(rs_pk) = rs_pk {
                if let Ok((id, pk)) = decode_id_pk(&signed_id_pk, &rs_pk) {
                    if id == peer_id {
                        sign_pk = Some(sign::PublicKey(pk));
                        option_pk = Some(pk.to_vec());
                    }
                }
            }
            if sign_pk.is_none() {
                log::error!("Handshake failed: invalid public key from rendezvous server");
            }
        }
        let sign_pk = match sign_pk {
            Some(v) => v,
            None => {
                // send an empty message out in case server is setting up secure and waiting for first message
                conn.send(&Message::new()).await?;
                return Ok(option_pk);
            }
        };
        match timeout(READ_TIMEOUT, conn.next()).await? {
            Some(res) => {
                let bytes = res?;
                if let Ok(msg_in) = Message::parse_from_bytes(&bytes) {
                    if let Some(message::Union::SignedId(si)) = msg_in.union {
                        if let Ok((id, their_pk_b)) = decode_id_pk(&si.id, &sign_pk) {
                            if id == peer_id {
                                let (asymmetric_value, symmetric_value, key) =
                                    create_symmetric_key_msg(their_pk_b);
                                let mut msg_out = Message::new();
                                msg_out.set_public_key(PublicKey {
                                    asymmetric_value,
                                    symmetric_value,
                                    ..Default::default()
                                });
                                timeout(CONNECT_TIMEOUT, conn.send(&msg_out)).await??;
                                conn.set_key(key);
                            } else {
                                log::error!("Handshake failed: sign failure");
                                conn.send(&Message::new()).await?;
                            }
                        } else {
                            // fall back to non-secure connection in case pk mismatch
                            log::info!("pk mismatch, fall back to non-secure");
                            let mut msg_out = Message::new();
                            msg_out.set_public_key(PublicKey::new());
                            conn.send(&msg_out).await?;
                        }
                    } else {
                        log::error!("Handshake failed: invalid message type");
                        conn.send(&Message::new()).await?;
                    }
                } else {
                    log::error!("Handshake failed: invalid message format");
                    conn.send(&Message::new()).await?;
                }
            }
            None => {
                bail!("Reset by the peer");
            }
        }
        Ok(option_pk)
    }

    /// Request a relay connection to the server.
    async fn request_relay(
        peer: &str,
        relay_server: String,
        rendezvous_server: &str,
        secure: bool,
        key: &str,
        token: &str,
        conn_type: ConnType,
    ) -> ResultType<Stream> {
        let mut succeed = false;
        let mut uuid = "".to_owned();
        let mut ipv4 = true;

        for i in 1..=3 {
            // use different socket due to current hbbs implementation requiring different nat address for each attempt
            let mut socket = connect_tcp(rendezvous_server, CONNECT_TIMEOUT)
                .await
                .with_context(|| "Failed to connect to rendezvous server")?;

            if !key.is_empty() && !token.is_empty() {
                // mainly for the security of token
                allow_err!(secure_tcp(&mut socket, key).await);
            }

            ipv4 = socket.local_addr().is_ipv4();
            let mut msg_out = RendezvousMessage::new();
            uuid = Uuid::new_v4().to_string();
            log::info!(
                "#{} request relay attempt, id: {}, uuid: {}, relay_server: {}, secure: {}",
                i,
                peer,
                uuid,
                relay_server,
                secure,
            );
            msg_out.set_request_relay(RequestRelay {
                id: peer.to_owned(),
                token: token.to_owned(),
                uuid: uuid.clone(),
                relay_server: relay_server.clone(),
                secure,
                ..Default::default()
            });
            socket.send(&msg_out).await?;

            if let Some(msg_in) =
                crate::get_next_nonkeyexchange_msg(&mut socket, Some(CONNECT_TIMEOUT)).await
            {
                if let Some(rendezvous_message::Union::RelayResponse(rs)) = msg_in.union {
                    if !rs.refuse_reason.is_empty() {
                        bail!(rs.refuse_reason);
                    }
                    succeed = true;
                    break;
                }
            }
        }
        if !succeed {
            bail!("Timeout");
        }
        Self::create_relay(peer, uuid, relay_server, key, conn_type, ipv4).await
    }

    /// Create a relay connection to the server.
    async fn create_relay(
        peer: &str,
        uuid: String,
        relay_server: String,
        key: &str,
        conn_type: ConnType,
        ipv4: bool,
    ) -> ResultType<Stream> {
        let mut conn = connect_tcp(
            ipv4_to_ipv6(check_port(relay_server, RELAY_PORT), ipv4),
            CONNECT_TIMEOUT,
        )
        .await
        .with_context(|| "Failed to connect to relay server")?;
        let mut msg_out = RendezvousMessage::new();
        msg_out.set_request_relay(RequestRelay {
            licence_key: key.to_owned(),
            id: peer.to_owned(),
            uuid,
            conn_type: conn_type.into(),
            ..Default::default()
        });
        conn.send(&msg_out).await?;
        Ok(conn)
    }

    #[inline]
    #[cfg(feature = "flutter")]
    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    pub fn set_is_text_clipboard_required(b: bool) {
        TEXT_CLIPBOARD_STATE.lock().unwrap().is_required = b;
    }

    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    fn try_stop_clipboard() {
        // There's a bug here.
        // If session is closed by the peer, `has_sessions_running()` will always return true.
        // It's better to check if the active session number.
        // But it's not a problem, because the clipboard thread does not consume CPU.
        //
        // If we want to fix it, we can add a flag to indicate if session is active.
        // But I think it's not necessary to introduce complexity at this point.
        #[cfg(feature = "flutter")]
        if crate::flutter::sessions::has_sessions_running(ConnType::DEFAULT_CONN) {
            return;
        }
        TEXT_CLIPBOARD_STATE.lock().unwrap().running = false;
    }

    // `try_start_clipboard` is called by all session when connection is established. (When handling peer info).
    // This function only create one thread with a loop, the loop is shared by all sessions.
    // After all sessions are end, the loop exists.
    //
    // If clipboard update is detected, the text will be sent to all sessions by `send_text_clipboard_msg`.
    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    fn try_start_clipboard(
        _client_clip_ctx: Option<ClientClipboardContext>,
    ) -> Option<UnboundedReceiver<()>> {
        let mut clipboard_lock = TEXT_CLIPBOARD_STATE.lock().unwrap();
        if clipboard_lock.running {
            return None;
        }

        let (tx_cb_result, rx_cb_result) = mpsc::channel();
        let handler = ClientClipboardHandler {
            ctx: None,
            tx_cb_result,
            #[cfg(not(feature = "flutter"))]
            client_clip_ctx: _client_clip_ctx,
        };

        let (tx_start_res, rx_start_res) = mpsc::channel();
        let h = crate::clipboard::start_clipbard_master_thread(handler, tx_start_res);
        let shutdown = match rx_start_res.recv() {
            Ok((Some(s), _)) => s,
            Ok((None, err)) => {
                log::error!("{}", err);
                return None;
            }
            Err(e) => {
                log::error!("Failed to create clipboard listener: {}", e);
                return None;
            }
        };

        clipboard_lock.running = true;

        let (tx_started, rx_started) = unbounded_channel();

        log::info!("Start text clipboard loop");
        std::thread::spawn(move || {
            let mut is_sent = false;

            loop {
                if !TEXT_CLIPBOARD_STATE.lock().unwrap().running {
                    break;
                }
                if !TEXT_CLIPBOARD_STATE.lock().unwrap().is_required {
                    std::thread::sleep(Duration::from_millis(CLIPBOARD_INTERVAL));
                    continue;
                }

                if !is_sent {
                    is_sent = true;
                    tx_started.send(()).ok();
                }

                match rx_cb_result.recv_timeout(Duration::from_millis(CLIPBOARD_INTERVAL)) {
                    Ok(CallbackResult::Stop) => {
                        log::debug!("Clipboard listener stopped");
                        break;
                    }
                    Ok(CallbackResult::StopWithError(err)) => {
                        log::error!("Clipboard listener stopped with error: {}", err);
                        break;
                    }
                    Err(RecvTimeoutError::Timeout) => {}
                    _ => {}
                }
            }
            log::info!("Stop text clipboard loop");
            shutdown.signal();
            h.join().ok();
            TEXT_CLIPBOARD_STATE.lock().unwrap().running = false;
        });

        Some(rx_started)
    }
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
impl TextClipboardState {
    fn new() -> Self {
        Self {
            is_required: true,
            running: false,
        }
    }
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
struct ClientClipboardHandler {
    ctx: Option<crate::clipboard::ClipboardContext>,
    tx_cb_result: Sender<CallbackResult>,
    #[cfg(not(feature = "flutter"))]
    client_clip_ctx: Option<ClientClipboardContext>,
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
impl ClientClipboardHandler {
    #[inline]
    #[cfg(feature = "flutter")]
    fn send_msg(&self, msg: Message) {
        crate::flutter::send_text_clipboard_msg(msg);
    }

    #[cfg(not(feature = "flutter"))]
    fn send_msg(&self, msg: Message) {
        if let Some(ctx) = &self.client_clip_ctx {
            if ctx.cfg.is_text_clipboard_required() {
                if let Some(pi) = ctx.cfg.lc.read().unwrap().peer_info.as_ref() {
                    if let Some(message::Union::MultiClipboards(multi_clipboards)) = &msg.union {
                        if let Some(msg_out) = crate::clipboard::get_msg_if_not_support_multi_clip(
                            &pi.version,
                            &pi.platform,
                            multi_clipboards,
                        ) {
                            let _ = ctx.tx.send(Data::Message(msg_out));
                            return;
                        }
                    }
                }
                let _ = ctx.tx.send(Data::Message(msg));
            }
        }
    }
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
impl ClipboardHandler for ClientClipboardHandler {
    fn on_clipboard_change(&mut self) -> CallbackResult {
        if TEXT_CLIPBOARD_STATE.lock().unwrap().running
            && TEXT_CLIPBOARD_STATE.lock().unwrap().is_required
        {
            if let Some(msg) = check_clipboard(&mut self.ctx, ClipboardSide::Client, false) {
                self.send_msg(msg);
            }
        }
        CallbackResult::Next
    }

    fn on_clipboard_error(&mut self, error: io::Error) -> CallbackResult {
        self.tx_cb_result
            .send(CallbackResult::StopWithError(error))
            .ok();
        CallbackResult::Next
    }
}

/// Audio handler for the [`Client`].
#[derive(Default)]
pub struct AudioHandler {
    audio_decoder: Option<(AudioDecoder, Vec<f32>)>,
    #[cfg(target_os = "android")]
    oboe: Option<OboePlayer>,
    #[cfg(target_os = "linux")]
    simple: Option<psimple::Simple>,
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    audio_buffer: AudioBuffer,
    sample_rate: (u32, u32),
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    audio_stream: Option<Box<dyn StreamTrait>>,
    channels: u16,
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    device_channel: u16,
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    ready: Arc<std::sync::Mutex<bool>>,
}

#[cfg(not(any(target_os = "android", target_os = "linux")))]
struct AudioBuffer(pub Arc<std::sync::Mutex<ringbuf::HeapRb<f32>>>);

#[cfg(not(any(target_os = "android", target_os = "linux")))]
impl Default for AudioBuffer {
    fn default() -> Self {
        Self(Arc::new(std::sync::Mutex::new(
            ringbuf::HeapRb::<f32>::new(48000 * 2 * AUDIO_BUFFER_MS / 1000), // 48000hz, 2 channel
        )))
    }
}

#[cfg(not(any(target_os = "android", target_os = "linux")))]
impl AudioBuffer {
    pub fn resize(&self, sample_rate: usize, channels: usize) {
        let capacity = sample_rate * channels * AUDIO_BUFFER_MS / 1000;
        let old_capacity = self.0.lock().unwrap().capacity();
        if capacity != old_capacity {
            *self.0.lock().unwrap() = ringbuf::HeapRb::<f32>::new(capacity);
            log::info!("Audio buffer resized from {old_capacity} to {capacity}");
        }
    }

    // clear when full to avoid long time noise
    #[inline]
    pub fn clear_if_full(&self) {
        let full = self.0.lock().unwrap().is_full();
        if full {
            self.0.lock().unwrap().clear();
            log::trace!("Audio buffer cleared");
        }
    }
}

impl AudioHandler {
    /// Start the audio playback.
    #[cfg(target_os = "linux")]
    fn start_audio(&mut self, format0: AudioFormat) -> ResultType<()> {
        use psimple::Simple;
        use pulse::sample::{Format, Spec};
        use pulse::stream::Direction;

        let spec = Spec {
            format: Format::F32le,
            channels: format0.channels as _,
            rate: format0.sample_rate as _,
        };
        if !spec.is_valid() {
            bail!("Invalid audio format");
        }

        self.simple = Some(Simple::new(
            None,                   // Use the default server
            &crate::get_app_name(), // Our application’s name
            Direction::Playback,    // We want a playback stream
            None,                   // Use the default device
            "playback",             // Description of our stream
            &spec,                  // Our sample format
            None,                   // Use default channel map
            None,                   // Use default buffering attributes
        )?);
        self.sample_rate = (format0.sample_rate, format0.sample_rate);
        Ok(())
    }

    /// Start the audio playback.
    #[cfg(target_os = "android")]
    fn start_audio(&mut self, format0: AudioFormat) -> ResultType<()> {
        self.oboe = Some(OboePlayer::new(
            format0.channels as _,
            format0.sample_rate as _,
        ));
        self.sample_rate = (format0.sample_rate, format0.sample_rate);
        Ok(())
    }

    /// Start the audio playback.
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    fn start_audio(&mut self, format0: AudioFormat) -> ResultType<()> {
        let device = AUDIO_HOST
            .default_output_device()
            .with_context(|| "Failed to get default output device")?;
        log::info!(
            "Using default output device: \"{}\"",
            device.name().unwrap_or("".to_owned())
        );
        let config = device.default_output_config().map_err(|e| anyhow!(e))?;
        let sample_format = config.sample_format();
        log::info!("Default output format: {:?}", config);
        log::info!("Remote input format: {:?}", format0);
        let config: StreamConfig = config.into();
        self.sample_rate = (format0.sample_rate, config.sample_rate.0);
        let mut build_output_stream = |config: StreamConfig| match sample_format {
            cpal::SampleFormat::I8 => self.build_output_stream::<i8>(&config, &device),
            cpal::SampleFormat::I16 => self.build_output_stream::<i16>(&config, &device),
            cpal::SampleFormat::I32 => self.build_output_stream::<i32>(&config, &device),
            cpal::SampleFormat::I64 => self.build_output_stream::<i64>(&config, &device),
            cpal::SampleFormat::U8 => self.build_output_stream::<u8>(&config, &device),
            cpal::SampleFormat::U16 => self.build_output_stream::<u16>(&config, &device),
            cpal::SampleFormat::U32 => self.build_output_stream::<u32>(&config, &device),
            cpal::SampleFormat::U64 => self.build_output_stream::<u64>(&config, &device),
            cpal::SampleFormat::F32 => self.build_output_stream::<f32>(&config, &device),
            cpal::SampleFormat::F64 => self.build_output_stream::<f64>(&config, &device),
            f => bail!("unsupported audio format: {:?}", f),
        };
        if config.channels > format0.channels as _ {
            let no_rechannel_config = StreamConfig {
                channels: format0.channels as _,
                ..config.clone()
            };
            if let Err(_) = build_output_stream(no_rechannel_config) {
                build_output_stream(config)?;
            }
        } else {
            build_output_stream(config)?;
        }

        Ok(())
    }

    /// Handle audio format and create an audio decoder.
    pub fn handle_format(&mut self, f: AudioFormat) {
        match AudioDecoder::new(f.sample_rate, if f.channels > 1 { Stereo } else { Mono }) {
            Ok(d) => {
                let buffer = vec![0.; f.sample_rate as usize * f.channels as usize];
                self.audio_decoder = Some((d, buffer));
                self.channels = f.channels as _;
                allow_err!(self.start_audio(f));
            }
            Err(err) => {
                log::error!("Failed to create audio decoder: {}", err);
            }
        }
    }

    /// Handle audio frame and play it.
    #[inline]
    pub fn handle_frame(&mut self, frame: AudioFrame) {
        #[cfg(not(any(target_os = "android", target_os = "linux")))]
        if self.audio_stream.is_none() || !self.ready.lock().unwrap().clone() {
            return;
        }
        #[cfg(target_os = "linux")]
        if self.simple.is_none() {
            log::debug!("PulseAudio simple binding does not exists");
            return;
        }
        #[cfg(target_os = "android")]
        if self.oboe.is_none() {
            return;
        }
        self.audio_decoder.as_mut().map(|(d, buffer)| {
            if let Ok(n) = d.decode_float(&frame.data, buffer, false) {
                let channels = self.channels;
                let n = n * (channels as usize);
                #[cfg(not(any(target_os = "android", target_os = "linux")))]
                {
                    let sample_rate0 = self.sample_rate.0;
                    let sample_rate = self.sample_rate.1;
                    let audio_buffer = self.audio_buffer.0.clone();
                    let mut buffer = buffer[0..n].to_owned();
                    if sample_rate != sample_rate0 {
                        buffer = crate::audio_resample(
                            &buffer[0..n],
                            sample_rate0,
                            sample_rate,
                            channels,
                        );
                    }
                    if self.channels != self.device_channel {
                        buffer = crate::audio_rechannel(
                            buffer,
                            sample_rate,
                            sample_rate,
                            self.channels,
                            self.device_channel,
                        );
                    }
                    self.audio_buffer.clear_if_full();
                    audio_buffer.lock().unwrap().push_slice_overwrite(&buffer);
                }
                #[cfg(target_os = "android")]
                {
                    self.oboe.as_mut().map(|x| x.push(&buffer[0..n]));
                }
                #[cfg(target_os = "linux")]
                {
                    let data_u8 =
                        unsafe { std::slice::from_raw_parts::<u8>(buffer.as_ptr() as _, n * 4) };
                    self.simple.as_mut().map(|x| x.write(data_u8));
                }
            }
        });
    }

    /// Build audio output stream for current device.
    #[cfg(not(any(target_os = "android", target_os = "linux")))]
    fn build_output_stream<T: cpal::Sample + cpal::SizedSample + cpal::FromSample<f32>>(
        &mut self,
        config: &StreamConfig,
        device: &Device,
    ) -> ResultType<()> {
        self.device_channel = config.channels;
        let err_fn = move |err| {
            // too many errors, will improve later
            log::trace!("an error occurred on stream: {}", err);
        };
        self.audio_buffer
            .resize(config.sample_rate.0 as _, config.channels as _);
        let audio_buffer = self.audio_buffer.0.clone();
        let ready = self.ready.clone();
        let timeout = None;
        let stream = device.build_output_stream(
            config,
            move |data: &mut [T], _: &_| {
                if !*ready.lock().unwrap() {
                    *ready.lock().unwrap() = true;
                }
                let mut lock = audio_buffer.lock().unwrap();
                let mut n = data.len();
                if lock.occupied_len() < n {
                    n = lock.occupied_len();
                }
                let mut elems = vec![0.0f32; n];
                lock.pop_slice(&mut elems);
                drop(lock);
                let mut input = elems.into_iter();
                for sample in data.iter_mut() {
                    *sample = match input.next() {
                        Some(x) => T::from_sample(x),
                        _ => T::from_sample(0.),
                    };
                }
            },
            err_fn,
            timeout,
        )?;
        stream.play()?;
        self.audio_stream = Some(Box::new(stream));
        Ok(())
    }
}

/// Video handler for the [`Client`].
pub struct VideoHandler {
    decoder: Decoder,
    pub rgb: ImageRgb,
    pub texture: *mut c_void,
    recorder: Arc<Mutex<Option<Recorder>>>,
    record: bool,
    _display: usize, // useful for debug
    fail_counter: usize,
    first_frame: bool,
}

impl VideoHandler {
    #[cfg(feature = "flutter")]
    pub fn get_adapter_luid() -> Option<i64> {
        crate::flutter::get_adapter_luid()
    }

    #[cfg(not(feature = "flutter"))]
    pub fn get_adapter_luid() -> Option<i64> {
        None
    }

    /// Create a new video handler.
    pub fn new(format: CodecFormat, _display: usize) -> Self {
        let luid = Self::get_adapter_luid();
        log::info!("new video handler for display #{_display}, format: {format:?}, luid: {luid:?}");
        VideoHandler {
            decoder: Decoder::new(format, luid),
            rgb: ImageRgb::new(ImageFormat::ARGB, crate::get_dst_align_rgba()),
            texture: std::ptr::null_mut(),
            recorder: Default::default(),
            record: false,
            _display,
            fail_counter: 0,
            first_frame: true,
        }
    }

    /// Handle a new video frame.
    #[inline]
    pub fn handle_frame(
        &mut self,
        vf: VideoFrame,
        pixelbuffer: &mut bool,
        chroma: &mut Option<Chroma>,
    ) -> ResultType<bool> {
        let format = CodecFormat::from(&vf);
        if format != self.decoder.format() {
            self.reset(Some(format));
        }
        match &vf.union {
            Some(frame) => {
                let res = self.decoder.handle_video_frame(
                    frame,
                    &mut self.rgb,
                    &mut self.texture,
                    pixelbuffer,
                    chroma,
                );
                if res.as_ref().is_ok_and(|x| *x) {
                    self.fail_counter = 0;
                } else {
                    if self.fail_counter < usize::MAX {
                        if self.first_frame && self.fail_counter < MAX_DECODE_FAIL_COUNTER {
                            log::error!("decode first frame failed");
                            self.fail_counter = MAX_DECODE_FAIL_COUNTER;
                        } else {
                            self.fail_counter += 1;
                        }
                        log::error!(
                            "Failed to handle video frame, fail counter: {}",
                            self.fail_counter
                        );
                    }
                }
                self.first_frame = false;
                if self.record {
                    self.recorder
                        .lock()
                        .unwrap()
                        .as_mut()
                        .map(|r| r.write_frame(frame));
                }
                res
            }
            _ => Ok(false),
        }
    }

    /// Reset the decoder, change format if it is Some
    pub fn reset(&mut self, format: Option<CodecFormat>) {
        log::info!(
            "reset video handler for display #{}, format: {format:?}",
            self._display
        );
        #[cfg(target_os = "macos")]
        self.rgb.set_align(crate::get_dst_align_rgba());
        let luid = Self::get_adapter_luid();
        let format = format.unwrap_or(self.decoder.format());
        self.decoder = Decoder::new(format, luid);
        self.fail_counter = 0;
        self.first_frame = true;
    }

    /// Start or stop screen record.
    pub fn record_screen(&mut self, start: bool, w: i32, h: i32, id: String) {
        self.record = false;
        if start {
            self.recorder = Recorder::new(RecorderContext {
                server: false,
                id,
                dir: crate::ui_interface::video_save_directory(false),
                filename: "".to_owned(),
                width: w as _,
                height: h as _,
                format: scrap::CodecFormat::VP9,
                tx: None,
            })
            .map_or(Default::default(), |r| Arc::new(Mutex::new(Some(r))));
        } else {
            self.recorder = Default::default();
        }

        self.record = start;
    }
}

// The source of sent password
#[derive(Debug, Clone, PartialEq, Eq)]
enum PasswordSource {
    PersonalAb(Vec<u8>),
    SharedAb(String),
    Undefined,
}

impl Default for PasswordSource {
    fn default() -> Self {
        PasswordSource::Undefined
    }
}

impl PasswordSource {
    // Whether the password is personal ab password
    pub fn is_personal_ab(&self, password: &[u8]) -> bool {
        if password.is_empty() {
            return false;
        }
        match self {
            PasswordSource::PersonalAb(p) => p == password,
            _ => false,
        }
    }

    // Whether the password is shared ab password
    pub fn is_shared_ab(&self, password: &[u8], hash: &Hash) -> bool {
        if password.is_empty() {
            return false;
        }
        match self {
            PasswordSource::SharedAb(p) => Self::equal(p, password, hash),
            _ => false,
        }
    }

    //  Whether the password equals to the connected password
    fn equal(password: &str, connected_password: &[u8], hash: &Hash) -> bool {
        let mut hasher = Sha256::new();
        hasher.update(password);
        hasher.update(&hash.salt);
        let res = hasher.finalize();
        connected_password[..] == res[..]
    }
}

/// Login config handler for [`Client`].
#[derive(Default)]
pub struct LoginConfigHandler {
    id: String,
    pub conn_type: ConnType,
    hash: Hash,
    password: Vec<u8>, // remember password for reconnect
    pub remember: bool,
    config: PeerConfig,
    pub port_forward: (String, i32),
    pub version: i64,
    features: Option<Features>,
    pub session_id: u64, // used for local <-> server communication
    pub supported_encoding: SupportedEncoding,
    pub restarting_remote_device: bool,
    pub force_relay: bool,
    pub direct: Option<bool>,
    pub received: bool,
    switch_uuid: Option<String>,
    pub save_ab_password_to_recent: bool, // true: connected with ab password
    pub other_server: Option<(String, String, String)>,
    pub custom_fps: Arc<Mutex<Option<usize>>>,
    pub last_auto_fps: Option<usize>,
    pub adapter_luid: Option<i64>,
    pub mark_unsupported: Vec<CodecFormat>,
    pub selected_windows_session_id: Option<u32>,
    pub peer_info: Option<PeerInfo>,
    password_source: PasswordSource, // where the sent password comes from
    shared_password: Option<String>, // Store the shared password
    pub enable_trusted_devices: bool,
}

impl Deref for LoginConfigHandler {
    type Target = PeerConfig;

    fn deref(&self) -> &Self::Target {
        &self.config
    }
}

impl LoginConfigHandler {
    /// Initialize the login config handler.
    ///
    /// # Arguments
    ///
    /// * `id` - id of peer
    /// * `conn_type` - Connection type enum.
    pub fn initialize(
        &mut self,
        id: String,
        conn_type: ConnType,
        switch_uuid: Option<String>,
        mut force_relay: bool,
        adapter_luid: Option<i64>,
        shared_password: Option<String>,
    ) {
        let mut id = id;
        if id.contains("@") {
            let mut v = id.split("@");
            let raw_id: &str = v.next().unwrap_or_default();
            let mut server_key = v.next().unwrap_or_default().split('?');
            let server = server_key.next().unwrap_or_default();
            let args = server_key.next().unwrap_or_default();
            let key = if server == PUBLIC_SERVER {
                PUBLIC_RS_PUB_KEY
            } else {
                let mut args_map: HashMap<&str, &str> = HashMap::new();
                for arg in args.split('&') {
                    if let Some(kv) = arg.find('=') {
                        let k = &arg[0..kv];
                        let v = &arg[kv + 1..];
                        args_map.insert(k, v);
                    }
                }
                let key = args_map.remove("key").unwrap_or_default();
                key
            };

            // here we can check <id>/r@server
            let real_id = crate::ui_interface::handle_relay_id(raw_id).to_string();
            if real_id != raw_id {
                force_relay = true;
            }
            self.other_server = Some((real_id.clone(), server.to_owned(), key.to_owned()));
            id = format!("{real_id}@{server}");
        } else {
            let real_id = crate::ui_interface::handle_relay_id(&id);
            if real_id != id {
                force_relay = true;
                id = real_id.to_owned();
            }
        }

        self.id = id;
        self.conn_type = conn_type;
        let config = self.load_config();
        self.remember = !config.password.is_empty();
        self.config = config;
        let mut sid = rand::random();
        if sid == 0 {
            // you won the lottery
            sid = 1;
        }
        self.session_id = sid;
        self.supported_encoding = Default::default();
        self.restarting_remote_device = false;
        self.force_relay =
            config::option2bool("force-always-relay", &self.get_option("force-always-relay"))
                || force_relay;
        if let Some((real_id, server, key)) = &self.other_server {
            let other_server_key = self.get_option("other-server-key");
            if !other_server_key.is_empty() && key.is_empty() {
                self.other_server = Some((real_id.to_owned(), server.to_owned(), other_server_key));
            }
        }
        self.direct = None;
        self.received = false;
        self.switch_uuid = switch_uuid;
        self.adapter_luid = adapter_luid;
        self.selected_windows_session_id = None;
        self.shared_password = shared_password;
    }

    /// Check if the client should auto login.
    /// Return password if the client should auto login, otherwise return empty string.
    pub fn should_auto_login(&self) -> String {
        let l = self.lock_after_session_end.v;
        let a = !self.get_option("auto-login").is_empty();
        let p = self.get_option("os-password");
        if !p.is_empty() && l && a {
            p
        } else {
            "".to_owned()
        }
    }

    /// Load [`PeerConfig`].
    pub fn load_config(&self) -> PeerConfig {
        debug_assert!(self.id.len() > 0);
        PeerConfig::load(&self.id)
    }

    /// Save a [`PeerConfig`] into the handler.
    ///
    /// # Arguments
    ///
    /// * `config` - [`PeerConfig`] to save.
    pub fn save_config(&mut self, config: PeerConfig) {
        config.store(&self.id);
        self.config = config;
    }

    /// Set an option for handler's [`PeerConfig`].
    ///
    /// # Arguments
    ///
    /// * `k` - key of option
    /// * `v` - value of option
    pub fn set_option(&mut self, k: String, v: String) {
        let mut config = self.load_config();
        config.options.insert(k, v);
        self.save_config(config);
    }

    //to-do: too many dup code below.

    /// Save view style to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The view style to be saved.
    pub fn save_view_style(&mut self, value: String) {
        let mut config = self.load_config();
        config.view_style = value;
        self.save_config(config);
    }

    /// Save keyboard mode to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The view style to be saved.
    pub fn save_keyboard_mode(&mut self, value: String) {
        let mut config = self.load_config();
        config.keyboard_mode = value;
        self.save_config(config);
    }

    /// Save reverse mouse wheel ("", "Y") to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The reverse mouse wheel ("", "Y").
    pub fn save_reverse_mouse_wheel(&mut self, value: String) {
        let mut config = self.load_config();
        config.reverse_mouse_wheel = value;
        self.save_config(config);
    }

    /// Save "displays_as_individual_windows" ("", "Y") to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The "displays_as_individual_windows" value ("", "Y").
    pub fn save_displays_as_individual_windows(&mut self, value: String) {
        let mut config = self.load_config();
        config.displays_as_individual_windows = value;
        self.save_config(config);
    }

    /// Save "use_all_my_displays_for_the_remote_session" ("", "Y") to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The "use_all_my_displays_for_the_remote_session" value ("", "Y").
    pub fn save_use_all_my_displays_for_the_remote_session(&mut self, value: String) {
        let mut config = self.load_config();
        config.use_all_my_displays_for_the_remote_session = value;
        self.save_config(config);
    }

    /// Save scroll style to the current config.
    ///
    /// # Arguments
    ///
    /// * `value` - The view style to be saved.
    pub fn save_scroll_style(&mut self, value: String) {
        let mut config = self.load_config();
        config.scroll_style = value;
        self.save_config(config);
    }

    /// Set a ui config of flutter for handler's [`PeerConfig`].
    ///
    /// # Arguments
    ///
    /// * `k` - key of option
    /// * `v` - value of option
    pub fn save_ui_flutter(&mut self, k: String, v: String) {
        let mut config = self.load_config();
        if v.is_empty() {
            config.ui_flutter.remove(&k);
        } else {
            config.ui_flutter.insert(k, v);
        }
        self.save_config(config);
    }

    pub fn set_direct_failure(&mut self, value: i32) {
        let mut config = self.load_config();
        config.direct_failures = value;
        self.save_config(config);
    }

    /// Get a ui config of flutter for handler's [`PeerConfig`].
    /// Return String if the option is found, otherwise return "".
    ///
    /// # Arguments
    ///
    /// * `k` - key of option
    pub fn get_ui_flutter(&self, k: &str) -> String {
        if let Some(v) = self.config.ui_flutter.get(k) {
            v.clone()
        } else {
            "".to_owned()
        }
    }

    /// Toggle an option in the handler.
    ///
    /// # Arguments
    ///
    /// * `name` - The name of the option to toggle.
    ///
    // It's Ok to check the option empty in this function.
    // `toggle_option()` is only called in a session.
    // Custom client advanced settings will not affact this function.
    pub fn toggle_option(&mut self, name: String) -> Option<Message> {
        let mut option = OptionMessage::default();
        let mut config = self.load_config();
        if name == "show-remote-cursor" {
            config.show_remote_cursor.v = !config.show_remote_cursor.v;
            option.show_remote_cursor = (if config.show_remote_cursor.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "follow-remote-cursor" {
            config.follow_remote_cursor.v = !config.follow_remote_cursor.v;
            option.follow_remote_cursor = (if config.follow_remote_cursor.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "follow-remote-window" {
            config.follow_remote_window.v = !config.follow_remote_window.v;
            option.follow_remote_window = (if config.follow_remote_window.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "disable-audio" {
            config.disable_audio.v = !config.disable_audio.v;
            option.disable_audio = (if config.disable_audio.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "disable-clipboard" {
            config.disable_clipboard.v = !config.disable_clipboard.v;
            option.disable_clipboard = (if config.disable_clipboard.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "lock-after-session-end" {
            config.lock_after_session_end.v = !config.lock_after_session_end.v;
            option.lock_after_session_end = (if config.lock_after_session_end.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "privacy-mode" {
            // try toggle privacy mode
            option.privacy_mode = (if config.privacy_mode.v {
                BoolOption::No
            } else {
                BoolOption::Yes
            })
            .into();
        } else if name == "enable-file-copy-paste" {
            config.enable_file_copy_paste.v = !config.enable_file_copy_paste.v;
            option.enable_file_transfer = (if config.enable_file_copy_paste.v {
                BoolOption::Yes
            } else {
                BoolOption::No
            })
            .into();
        } else if name == "block-input" {
            option.block_input = BoolOption::Yes.into();
        } else if name == "unblock-input" {
            option.block_input = BoolOption::No.into();
        } else if name == "show-quality-monitor" {
            config.show_quality_monitor.v = !config.show_quality_monitor.v;
        } else if name == "allow_swap_key" {
            config.allow_swap_key.v = !config.allow_swap_key.v;
        } else if name == "view-only" {
            config.view_only.v = !config.view_only.v;
            let f = |b: bool| {
                if b {
                    BoolOption::Yes.into()
                } else {
                    BoolOption::No.into()
                }
            };
            if config.view_only.v {
                option.disable_keyboard = f(true);
                option.disable_clipboard = f(true);
                option.show_remote_cursor = f(true);
                option.enable_file_transfer = f(false);
                option.lock_after_session_end = f(false);
            } else {
                option.disable_keyboard = f(false);
                option.disable_clipboard = f(self.get_toggle_option("disable-clipboard"));
                option.show_remote_cursor = f(self.get_toggle_option("show-remote-cursor"));
                option.enable_file_transfer = f(self.config.enable_file_copy_paste.v);
                option.lock_after_session_end = f(self.config.lock_after_session_end.v);
            }
        } else {
            let is_set = self
                .options
                .get(&name)
                .map(|o| !o.is_empty())
                .unwrap_or(false);
            if is_set {
                self.config.options.remove(&name);
            } else {
                self.config.options.insert(name, "Y".to_owned());
            }
            self.config.store(&self.id);
            return None;
        }
        if !name.contains("block-input") {
            self.save_config(config);
        }
        let mut misc = Misc::new();
        misc.set_option(option);
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        Some(msg_out)
    }

    /// Get [`PeerConfig`] of the current [`LoginConfigHandler`].
    ///
    /// # Arguments
    pub fn get_config(&mut self) -> &mut PeerConfig {
        &mut self.config
    }

    /// Get [`OptionMessage`] of the current [`LoginConfigHandler`].
    /// Return `None` if there's no option, for example, when the session is only for file transfer.
    ///
    /// # Arguments
    ///
    /// * `ignore_default` - If `true`, ignore the default value of the option.
    fn get_option_message(&self, ignore_default: bool) -> Option<OptionMessage> {
        if self.conn_type.eq(&ConnType::PORT_FORWARD)
            || self.conn_type.eq(&ConnType::RDP)
            || self.conn_type.eq(&ConnType::FILE_TRANSFER)
        {
            return None;
        }
        let mut msg = OptionMessage::new();
        let q = self.image_quality.clone();
        if let Some(q) = self.get_image_quality_enum(&q, ignore_default) {
            msg.image_quality = q.into();
        } else if q == "custom" {
            let config = self.load_config();
            let allow_more = !crate::using_public_server() || self.direct == Some(true);
            let quality = if config.custom_image_quality.is_empty() {
                50
            } else {
                let mut quality = config.custom_image_quality[0];
                if !allow_more && quality > 100 {
                    quality = 50;
                }
                quality
            };
            msg.custom_image_quality = quality << 8;
            #[cfg(feature = "flutter")]
            if let Some(custom_fps) = self.options.get("custom-fps") {
                let mut custom_fps = custom_fps.parse().unwrap_or(30);
                if !allow_more && custom_fps > 30 {
                    custom_fps = 30;
                }
                msg.custom_fps = custom_fps;
                *self.custom_fps.lock().unwrap() = Some(custom_fps as _);
            }
        }
        let view_only = self.get_toggle_option("view-only");
        if view_only {
            msg.disable_keyboard = BoolOption::Yes.into();
        }
        if view_only || self.get_toggle_option("show-remote-cursor") {
            msg.show_remote_cursor = BoolOption::Yes.into();
        }
        if self.get_toggle_option("follow-remote-cursor") {
            msg.follow_remote_cursor = BoolOption::Yes.into();
        }
        if self.get_toggle_option("follow-remote-window") {
            msg.follow_remote_window = BoolOption::Yes.into();
        }
        if !view_only && self.get_toggle_option("lock-after-session-end") {
            msg.lock_after_session_end = BoolOption::Yes.into();
        }
        if self.get_toggle_option("disable-audio") {
            msg.disable_audio = BoolOption::Yes.into();
        }
        if !view_only && self.get_toggle_option(config::keys::OPTION_ENABLE_FILE_COPY_PASTE) {
            msg.enable_file_transfer = BoolOption::Yes.into();
        }
        if view_only || self.get_toggle_option("disable-clipboard") {
            msg.disable_clipboard = BoolOption::Yes.into();
        }
        msg.supported_decoding = MessageField::some(self.get_supported_decoding());
        Some(msg)
    }

    pub fn get_supported_decoding(&self) -> SupportedDecoding {
        Decoder::supported_decodings(
            Some(&self.id),
            use_texture_render(),
            self.adapter_luid,
            &self.mark_unsupported,
        )
    }

    /// Parse the image quality option.
    /// Return [`ImageQuality`] if the option is valid, otherwise return `None`.
    ///
    /// # Arguments
    ///
    /// * `q` - The image quality option.
    /// * `ignore_default` - Ignore the default value.
    fn get_image_quality_enum(&self, q: &str, ignore_default: bool) -> Option<ImageQuality> {
        if q == "low" {
            Some(ImageQuality::Low)
        } else if q == "best" {
            Some(ImageQuality::Best)
        } else if q == "balanced" {
            if ignore_default {
                None
            } else {
                Some(ImageQuality::Balanced)
            }
        } else {
            None
        }
    }

    /// Get the status of a toggle option.
    ///
    /// # Arguments
    ///
    /// * `name` - The name of the toggle option.
    ///
    // It's Ok to check the option empty in this function.
    // `get_toggle_option()` is only called in a session.
    // Custom client advanced settings will not affact this function.
    pub fn get_toggle_option(&self, name: &str) -> bool {
        if name == "show-remote-cursor" {
            self.config.show_remote_cursor.v
        } else if name == "lock-after-session-end" {
            self.config.lock_after_session_end.v
        } else if name == "privacy-mode" {
            self.config.privacy_mode.v
        } else if name == config::keys::OPTION_ENABLE_FILE_COPY_PASTE {
            self.config.enable_file_copy_paste.v
        } else if name == "disable-audio" {
            self.config.disable_audio.v
        } else if name == "disable-clipboard" {
            self.config.disable_clipboard.v
        } else if name == "show-quality-monitor" {
            self.config.show_quality_monitor.v
        } else if name == "allow_swap_key" {
            self.config.allow_swap_key.v
        } else if name == "view-only" {
            self.config.view_only.v
        } else if name == "follow-remote-cursor" {
            self.config.follow_remote_cursor.v
        } else if name == "follow-remote-window" {
            self.config.follow_remote_window.v
        } else {
            !self.get_option(name).is_empty()
        }
    }

    pub fn is_privacy_mode_supported(&self) -> bool {
        if let Some(features) = &self.features {
            features.privacy_mode
        } else {
            false
        }
    }

    /// Create a [`Message`] for refreshing video.
    pub fn refresh() -> Message {
        let mut misc = Misc::new();
        misc.set_refresh_video(true);
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        msg_out
    }

    /// Create a [`Message`] for refreshing video.
    pub fn refresh_display(display: usize) -> Message {
        let mut misc = Misc::new();
        misc.set_refresh_video_display(display as _);
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        msg_out
    }

    /// Create a [`Message`] for saving custom image quality.
    ///
    /// # Arguments
    ///
    /// * `bitrate` - The given bitrate.
    /// * `quantizer` - The given quantizer.
    pub fn save_custom_image_quality(&mut self, image_quality: i32) -> Message {
        let mut misc = Misc::new();
        misc.set_option(OptionMessage {
            custom_image_quality: image_quality << 8,
            ..Default::default()
        });
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        let mut config = self.load_config();
        config.image_quality = "custom".to_owned();
        config.custom_image_quality = vec![image_quality as _];
        self.save_config(config);
        msg_out
    }

    /// Save the given image quality to the config.
    /// Return a [`Message`] that contains image quality, or `None` if the image quality is not valid.
    /// # Arguments
    ///
    /// * `value` - The image quality.
    pub fn save_image_quality(&mut self, value: String) -> Option<Message> {
        let mut res = None;
        if let Some(q) = self.get_image_quality_enum(&value, false) {
            let mut misc = Misc::new();
            misc.set_option(OptionMessage {
                image_quality: q.into(),
                ..Default::default()
            });
            let mut msg_out = Message::new();
            msg_out.set_misc(misc);
            res = Some(msg_out);
        }
        let mut config = self.load_config();
        config.image_quality = value;
        self.save_config(config);
        res
    }

    /// Create a [`Message`] for saving custom fps.
    ///
    /// # Arguments
    ///
    /// * `fps` - The given fps.
    /// * `save_config` - Save the config.
    pub fn set_custom_fps(&mut self, fps: i32, save_config: bool) -> Message {
        let mut misc = Misc::new();
        misc.set_option(OptionMessage {
            custom_fps: fps,
            ..Default::default()
        });
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        if save_config {
            let mut config = self.load_config();
            config
                .options
                .insert("custom-fps".to_owned(), fps.to_string());
            self.save_config(config);
        }
        *self.custom_fps.lock().unwrap() = Some(fps as _);
        msg_out
    }

    pub fn get_option(&self, k: &str) -> String {
        if let Some(v) = self.config.options.get(k) {
            v.clone()
        } else {
            "".to_owned()
        }
    }

    #[inline]
    pub fn get_custom_resolution(&self, display: i32) -> Option<(i32, i32)> {
        self.config
            .custom_resolutions
            .get(&display.to_string())
            .map(|r| (r.w, r.h))
    }

    #[inline]
    pub fn set_custom_resolution(&mut self, display: i32, wh: Option<(i32, i32)>) {
        let display = display.to_string();
        let mut config = self.load_config();
        match wh {
            Some((w, h)) => {
                config
                    .custom_resolutions
                    .insert(display, Resolution { w, h });
            }
            None => {
                config.custom_resolutions.remove(&display);
            }
        }
        self.save_config(config);
    }

    /// Get user name.
    /// Return the name of the given peer. If the peer has no name, return the name in the config.
    ///
    /// # Arguments
    ///
    /// * `pi` - peer info.
    pub fn get_username(&self, pi: &PeerInfo) -> String {
        return if pi.username.is_empty() {
            self.info.username.clone()
        } else {
            pi.username.clone()
        };
    }

    /// Handle peer info.
    ///
    /// # Arguments
    ///
    /// * `username` - The name of the peer.
    /// * `pi` - The peer info.
    pub fn handle_peer_info(&mut self, pi: &PeerInfo) {
        if !pi.version.is_empty() {
            self.version = hbb_common::get_version_number(&pi.version);
        }
        self.features = pi.features.clone().into_option();
        let serde = PeerInfoSerde {
            username: pi.username.clone(),
            hostname: pi.hostname.clone(),
            platform: pi.platform.clone(),
        };
        let mut config = self.load_config();
        config.info = serde;
        let password = self.password.clone();
        let password0 = config.password.clone();
        let remember = self.remember;
        let hash = self.hash.clone();
        if remember {
            // remember is true: use PeerConfig password or ui login
            // not sync shared password to recent
            if !password.is_empty()
                && password != password0
                && !self.password_source.is_shared_ab(&password, &hash)
            {
                config.password = password.clone();
                log::debug!("remember password of {}", self.id);
            }
        } else {
            if self.password_source.is_personal_ab(&password) {
                // sync personal ab password to recent automatically
                config.password = password.clone();
                log::debug!("save ab password of {} to recent", self.id);
            } else if !password0.is_empty() {
                config.password = Default::default();
                log::debug!("remove password of {}", self.id);
            }
        }
        if let Some((_, b, c)) = self.other_server.as_ref() {
            if b != PUBLIC_SERVER {
                config
                    .options
                    .insert("other-server-key".to_owned(), c.clone());
            }
        }
        if self.force_relay {
            config
                .options
                .insert("force-always-relay".to_owned(), "Y".to_owned());
        }
        #[cfg(feature = "flutter")]
        {
            // sync connected password to personal ab automatically if it is not shared password
            if !config.password.is_empty()
                && !self.password_source.is_shared_ab(&password, &hash)
                && !self.password_source.is_personal_ab(&password)
            {
                let hash = base64::encode(config.password.clone(), base64::Variant::Original);
                let evt: HashMap<&str, String> = HashMap::from([
                    ("name", "sync_peer_hash_password_to_personal_ab".to_string()),
                    ("id", self.id.clone()),
                    ("hash", hash),
                ]);
                let evt = serde_json::ser::to_string(&evt).unwrap_or("".to_owned());
                crate::flutter::push_global_event(crate::flutter::APP_TYPE_MAIN, evt);
            }
        }
        if config.keyboard_mode.is_empty() {
            if is_keyboard_mode_supported(
                &KeyboardMode::Map,
                get_version_number(&pi.version),
                &pi.platform,
            ) {
                config.keyboard_mode = KeyboardMode::Map.to_string();
            } else {
                config.keyboard_mode = KeyboardMode::Legacy.to_string();
            }
        } else {
            let keyboard_modes =
                crate::get_supported_keyboard_modes(get_version_number(&pi.version), &pi.platform);
            let current_mode = &KeyboardMode::from_str(&config.keyboard_mode).unwrap_or_default();
            if !keyboard_modes.contains(current_mode) {
                config.keyboard_mode = KeyboardMode::Legacy.to_string();
            }
        }
        // no matter if change, for update file time
        self.save_config(config);
        self.supported_encoding = pi.encoding.clone().unwrap_or_default();
        log::info!("peer info supported_encoding:{:?}", self.supported_encoding);
    }

    pub fn get_remote_dir(&self) -> String {
        serde_json::from_str::<HashMap<String, String>>(&self.get_option("remote_dir"))
            .unwrap_or_default()
            .remove(&self.info.username)
            .unwrap_or_default()
    }

    pub fn get_all_remote_dir(&self, path: String) -> String {
        let d = self.get_option("remote_dir");
        let user = self.info.username.clone();
        let mut x = serde_json::from_str::<HashMap<String, String>>(&d).unwrap_or_default();
        if path.is_empty() {
            x.remove(&user);
        } else {
            x.insert(user, path);
        }
        serde_json::to_string::<HashMap<String, String>>(&x).unwrap_or_default()
    }

    /// Create a [`Message`] for login.
    fn create_login_msg(
        &self,
        os_username: String,
        os_password: String,
        password: Vec<u8>,
    ) -> Message {
        #[cfg(any(target_os = "android", target_os = "ios"))]
        let my_id = Config::get_id_or(crate::DEVICE_ID.lock().unwrap().clone());
        #[cfg(not(any(target_os = "android", target_os = "ios")))]
        let my_id = Config::get_id();
        let (my_id, pure_id) = if let Some((id, _, _)) = self.other_server.as_ref() {
            let server = Config::get_rendezvous_server();
            (format!("{my_id}@{server}"), id.clone())
        } else {
            (my_id, self.id.clone())
        };
        let mut display_name = get_builtin_option(config::keys::OPTION_DISPLAY_NAME);
        if display_name.is_empty() {
            display_name =
                serde_json::from_str::<serde_json::Value>(&LocalConfig::get_option("user_info"))
                    .map(|x| {
                        x.get("name")
                            .map(|x| x.as_str().unwrap_or_default())
                            .unwrap_or_default()
                            .to_owned()
                    })
                    .unwrap_or_default();
        }
        if display_name.is_empty() {
            display_name = crate::username();
        }
        #[cfg(not(target_os = "android"))]
        let my_platform = whoami::platform().to_string();
        #[cfg(target_os = "android")]
        let my_platform = "Android".into();
        let hwid = if self.get_option("trust-this-device") == "Y" {
            crate::get_hwid()
        } else {
            Bytes::new()
        };
        let mut lr = LoginRequest {
            username: pure_id,
            password: password.into(),
            my_id,
            my_name: display_name,
            my_platform,
            option: self.get_option_message(true).into(),
            session_id: self.session_id,
            version: crate::VERSION.to_string(),
            os_login: Some(OSLogin {
                username: os_username,
                password: os_password,
                ..Default::default()
            })
            .into(),
            hwid,
            ..Default::default()
        };
        match self.conn_type {
            ConnType::FILE_TRANSFER => lr.set_file_transfer(FileTransfer {
                dir: self.get_remote_dir(),
                show_hidden: !self.get_option("remote_show_hidden").is_empty(),
                ..Default::default()
            }),
            ConnType::PORT_FORWARD | ConnType::RDP => lr.set_port_forward(PortForward {
                host: self.port_forward.0.clone(),
                port: self.port_forward.1,
                ..Default::default()
            }),
            _ => {}
        }

        let mut msg_out = Message::new();
        msg_out.set_login_request(lr);
        msg_out
    }

    pub fn update_supported_decodings(&self) -> Message {
        let decoding = scrap::codec::Decoder::supported_decodings(
            Some(&self.id),
            use_texture_render(),
            self.adapter_luid,
            &self.mark_unsupported,
        );
        let mut misc = Misc::new();
        misc.set_option(OptionMessage {
            supported_decoding: hbb_common::protobuf::MessageField::some(decoding),
            ..Default::default()
        });
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        msg_out
    }

    pub fn restart_remote_device(&self) -> Message {
        let mut misc = Misc::new();
        misc.set_restart_remote_device(true);
        let mut msg_out = Message::new();
        msg_out.set_misc(misc);
        msg_out
    }
}

/// Media data.
pub enum MediaData {
    VideoQueue(usize),
    VideoFrame(Box<VideoFrame>),
    AudioFrame(Box<AudioFrame>),
    AudioFormat(AudioFormat),
    Reset(Option<usize>),
    RecordScreen(bool, usize, i32, i32, String),
}

pub type MediaSender = mpsc::Sender<MediaData>;

struct VideoHandlerController {
    handler: VideoHandler,
    skip_beginning: u32,
}

/// Start video and audio thread.
/// Return two [`MediaSender`], they should be given to the media producer.
///
/// # Arguments
///
/// * `video_callback` - The callback for video frame. Being called when a video frame is ready.
pub fn start_video_audio_threads<F, T>(
    session: Session<T>,
    video_callback: F,
) -> (
    MediaSender,
    MediaSender,
    Arc<RwLock<HashMap<usize, ArrayQueue<VideoFrame>>>>,
    Arc<RwLock<Option<usize>>>,
    Arc<RwLock<Option<Chroma>>>,
)
where
    F: 'static + FnMut(usize, &mut scrap::ImageRgb, *mut c_void, bool) + Send,
    T: InvokeUiSession,
{
    let (video_sender, video_receiver) = mpsc::channel::<MediaData>();
    let video_queue_map: Arc<RwLock<HashMap<usize, ArrayQueue<VideoFrame>>>> = Default::default();
    let video_queue_map_cloned = video_queue_map.clone();
    let mut video_callback = video_callback;

    let fps = Arc::new(RwLock::new(None));
    let decode_fps_map = fps.clone();
    let chroma = Arc::new(RwLock::new(None));
    let chroma_cloned = chroma.clone();
    let mut last_chroma = None;

    std::thread::spawn(move || {
        #[cfg(windows)]
        sync_cpu_usage();
        get_hwcodec_config();
        let mut handler_controller_map = HashMap::new();
        let mut count = 0;
        let mut duration = std::time::Duration::ZERO;
        loop {
            if let Ok(data) = video_receiver.recv() {
                match data {
                    MediaData::VideoFrame(_) | MediaData::VideoQueue(_) => {
                        let vf = match data {
                            MediaData::VideoFrame(vf) => *vf,
                            MediaData::VideoQueue(display) => {
                                if let Some(video_queue) =
                                    video_queue_map.read().unwrap().get(&display)
                                {
                                    if let Some(vf) = video_queue.pop() {
                                        vf
                                    } else {
                                        continue;
                                    }
                                } else {
                                    continue;
                                }
                            }
                            _ => {
                                // unreachable!();
                                continue;
                            }
                        };
                        let display = vf.display as usize;
                        let start = std::time::Instant::now();
                        let format = CodecFormat::from(&vf);
                        if !handler_controller_map.contains_key(&display) {
                            handler_controller_map.insert(
                                display,
                                VideoHandlerController {
                                    handler: VideoHandler::new(format, display),
                                    skip_beginning: 0,
                                },
                            );
                        }
                        if let Some(handler_controller) = handler_controller_map.get_mut(&display) {
                            let mut pixelbuffer = true;
                            let mut tmp_chroma = None;
                            let format_changed =
                                handler_controller.handler.decoder.format() != format;
                            match handler_controller.handler.handle_frame(
                                vf,
                                &mut pixelbuffer,
                                &mut tmp_chroma,
                            ) {
                                Ok(true) => {
                                    video_callback(
                                        display,
                                        &mut handler_controller.handler.rgb,
                                        handler_controller.handler.texture,
                                        pixelbuffer,
                                    );

                                    // chroma
                                    if tmp_chroma.is_some() && last_chroma != tmp_chroma {
                                        last_chroma = tmp_chroma;
                                        *chroma.write().unwrap() = tmp_chroma;
                                    }

                                    // fps calculation
                                    fps_calculate(
                                        handler_controller,
                                        &fps,
                                        format_changed,
                                        start.elapsed(),
                                        &mut count,
                                        &mut duration,
                                    );
                                }
                                Err(e) => {
                                    // This is a simple workaround.
                                    //
                                    // I only see the following error:
                                    // FailedCall("errcode=1 scrap::common::vpxcodec:libs\\scrap\\src\\common\\vpxcodec.rs:433:9")
                                    // When switching from all displays to one display, the error occurs.
                                    // eg:
                                    // 1. Connect to a device with two displays (A and B).
                                    // 2. Switch to display A. The error occurs.
                                    // 3. If the error does not occur. Switch from A to display B. The error occurs.
                                    //
                                    // to-do: fix the error
                                    log::error!("handle video frame error, {}", e);
                                    session.refresh_video(display as _);
                                }
                                _ => {}
                            }
                        }

                        // check invalid decoders
                        let mut should_update_supported = false;
                        handler_controller_map
                            .iter()
                            .map(|(_, h)| {
                                if !h.handler.decoder.valid() || h.handler.fail_counter >= MAX_DECODE_FAIL_COUNTER {
                                    let mut lc = session.lc.write().unwrap();
                                    let format = h.handler.decoder.format();
                                    if !lc.mark_unsupported.contains(&format) {
                                        lc.mark_unsupported.push(format);
                                        should_update_supported = true;
                                        log::info!("mark {format:?} decoder as unsupported, valid:{}, fail_counter:{}, all unsupported:{:?}", h.handler.decoder.valid(), h.handler.fail_counter, lc.mark_unsupported);
                                    }
                                }
                            })
                            .count();
                        if should_update_supported {
                            session.send(Data::Message(
                                session.lc.read().unwrap().update_supported_decodings(),
                            ));
                        }
                    }
                    MediaData::Reset(display) => {
                        if let Some(display) = display {
                            if let Some(handler_controler) =
                                handler_controller_map.get_mut(&display)
                            {
                                handler_controler.handler.reset(None);
                            }
                        } else {
                            for (_, handler_controler) in handler_controller_map.iter_mut() {
                                handler_controler.handler.reset(None);
                            }
                        }
                    }
                    MediaData::RecordScreen(start, display, w, h, id) => {
                        log::info!("record screen command: start: {start}, display: {display}");
                        // Compatible with the sciter version(single ui session).
                        // For the sciter version, there're no multi-ui-sessions for one connection.
                        // The display is always 0, video_handler_controllers.len() is always 1. So we use the first video handler.
                        if let Some(handler_controler) = handler_controller_map.get_mut(&display) {
                            handler_controler.handler.record_screen(start, w, h, id);
                        } else if handler_controller_map.len() == 1 {
                            if let Some(handler_controler) =
                                handler_controller_map.values_mut().next()
                            {
                                handler_controler.handler.record_screen(start, w, h, id);
                            }
                        }
                    }
                    _ => {}
                }
            } else {
                break;
            }
        }
        log::info!("Video decoder loop exits");
    });
    let audio_sender = start_audio_thread();
    return (
        video_sender,
        audio_sender,
        video_queue_map_cloned,
        decode_fps_map,
        chroma_cloned,
    );
}

/// Start an audio thread
/// Return a audio [`MediaSender`]
pub fn start_audio_thread() -> MediaSender {
    let (audio_sender, audio_receiver) = mpsc::channel::<MediaData>();
    std::thread::spawn(move || {
        let mut audio_handler = AudioHandler::default();
        loop {
            if let Ok(data) = audio_receiver.recv() {
                match data {
                    MediaData::AudioFrame(af) => {
                        audio_handler.handle_frame(*af);
                    }
                    MediaData::AudioFormat(f) => {
                        log::debug!("recved audio format, sample rate={}", f.sample_rate);
                        audio_handler.handle_format(f);
                    }
                    _ => {}
                }
            } else {
                break;
            }
        }
        log::info!("Audio decoder loop exits");
    });
    audio_sender
}

#[inline]
fn fps_calculate(
    handler_controller: &mut VideoHandlerController,
    fps: &Arc<RwLock<Option<usize>>>,
    format_changed: bool,
    elapsed: std::time::Duration,
    count: &mut usize,
    duration: &mut std::time::Duration,
) {
    if format_changed {
        *count = 0;
        *duration = std::time::Duration::ZERO;
        handler_controller.skip_beginning = 0;
    }
    // // The first frame will be very slow
    if handler_controller.skip_beginning < 3 {
        handler_controller.skip_beginning += 1;
        return;
    }
    *duration += elapsed;
    *count += 1;
    let ms = duration.as_millis();
    if *count % 10 == 0 && ms > 0 {
        *fps.write().unwrap() = Some((*count as usize) * 1000 / (ms as usize));
    }
    // Clear to get real-time fps
    if *count >= 30 {
        *count = 0;
        *duration = Duration::ZERO;
    }
}

fn get_hwcodec_config() {
    // for sciter and unilink
    #[cfg(feature = "hwcodec")]
    #[cfg(any(target_os = "windows", target_os = "linux"))]
    {
        use std::sync::Once;
        static ONCE: Once = Once::new();
        ONCE.call_once(|| {
            let start = std::time::Instant::now();
            if let Err(e) = crate::ipc::get_hwcodec_config_from_server() {
                log::error!(
                    "Failed to get hwcodec config: {e:?}, elapsed: {:?}",
                    start.elapsed()
                );
            } else {
                log::info!("{:?} used to get hwcodec config", start.elapsed());
            }
        });
    }
}

#[cfg(windows)]
fn sync_cpu_usage() {
    use std::sync::Once;
    static ONCE: Once = Once::new();
    ONCE.call_once(|| {
        let t = std::thread::spawn(do_sync_cpu_usage);
        t.join().ok();
    });
}

#[cfg(windows)]
#[tokio::main(flavor = "current_thread")]
async fn do_sync_cpu_usage() {
    use crate::ipc::{connect, Data};
    let start = std::time::Instant::now();
    match connect(50, "").await {
        Ok(mut conn) => {
            if conn.send(&&Data::SyncWinCpuUsage(None)).await.is_ok() {
                if let Ok(Some(data)) = conn.next_timeout(50).await {
                    match data {
                        Data::SyncWinCpuUsage(cpu_usage) => {
                            hbb_common::platform::windows::sync_cpu_usage(cpu_usage);
                        }
                        _ => {}
                    }
                }
            }
        }
        _ => {}
    }
    log::info!("{:?} used to sync cpu usage", start.elapsed());
}

/// Handle latency test.
///
/// # Arguments
///
/// * `t` - The latency test message.
/// * `peer` - The peer.
pub async fn handle_test_delay(t: TestDelay, peer: &mut Stream) {
    if !t.from_client {
        let mut msg_out = Message::new();
        msg_out.set_test_delay(t);
        allow_err!(peer.send(&msg_out).await);
    }
}

/// Whether is track pad scrolling.
#[inline]
#[cfg(all(target_os = "macos", not(feature = "flutter")))]
fn check_scroll_on_mac(mask: i32, x: i32, y: i32) -> bool {
    // flutter version we set mask type bit to 4 when track pad scrolling.
    if mask & 7 == crate::input::MOUSE_TYPE_TRACKPAD {
        return true;
    }
    if mask & 3 != crate::input::MOUSE_TYPE_WHEEL {
        return false;
    }
    let btn = mask >> 3;
    if y == -1 {
        btn != 0xff88 && btn != -0x780000
    } else if y == 1 {
        btn != 0x78 && btn != 0x780000
    } else if x != 0 {
        // No mouse support horizontal scrolling.
        true
    } else {
        false
    }
}

/// Send mouse data.
///
/// # Arguments
///
/// * `mask` - Mouse event.
///     * mask = buttons << 3 | type
///     * type, 1: down, 2: up, 3: wheel, 4: trackpad
///     * buttons, 1: left, 2: right, 4: middle
/// * `x` - X coordinate.
/// * `y` - Y coordinate.
/// * `alt` - Whether the alt key is pressed.
/// * `ctrl` - Whether the ctrl key is pressed.
/// * `shift` - Whether the shift key is pressed.
/// * `command` - Whether the command key is pressed.
/// * `interface` - The interface for sending data.
#[inline]
pub fn send_mouse(
    mask: i32,
    x: i32,
    y: i32,
    alt: bool,
    ctrl: bool,
    shift: bool,
    command: bool,
    interface: &impl Interface,
) {
    let mut msg_out = Message::new();
    let mut mouse_event = MouseEvent {
        mask,
        x,
        y,
        ..Default::default()
    };
    if alt {
        mouse_event.modifiers.push(ControlKey::Alt.into());
    }
    if shift {
        mouse_event.modifiers.push(ControlKey::Shift.into());
    }
    if ctrl {
        mouse_event.modifiers.push(ControlKey::Control.into());
    }
    if command {
        mouse_event.modifiers.push(ControlKey::Meta.into());
    }
    #[cfg(all(target_os = "macos", not(feature = "flutter")))]
    if check_scroll_on_mac(mask, x, y) {
        let factor = 3;
        mouse_event.mask = crate::input::MOUSE_TYPE_TRACKPAD;
        mouse_event.x *= factor;
        mouse_event.y *= factor;
    }
    interface.swap_modifier_mouse(&mut mouse_event);
    msg_out.set_mouse_event(mouse_event);
    interface.send(Data::Message(msg_out));
}

#[inline]
pub fn send_pointer_device_event(
    mut evt: PointerDeviceEvent,
    alt: bool,
    ctrl: bool,
    shift: bool,
    command: bool,
    interface: &impl Interface,
) {
    let mut msg_out = Message::new();
    if alt {
        evt.modifiers.push(ControlKey::Alt.into());
    }
    if shift {
        evt.modifiers.push(ControlKey::Shift.into());
    }
    if ctrl {
        evt.modifiers.push(ControlKey::Control.into());
    }
    if command {
        evt.modifiers.push(ControlKey::Meta.into());
    }
    msg_out.set_pointer_device_event(evt);
    interface.send(Data::Message(msg_out));
}

/// Activate OS by sending mouse movement.
///
/// # Arguments
///
/// * `interface` - The interface for sending data.
/// * `send_left_click` - Whether to send a click event.
fn activate_os(interface: &impl Interface, send_left_click: bool) {
    let left_down = MOUSE_BUTTON_LEFT << 3 | MOUSE_TYPE_DOWN;
    let left_up = MOUSE_BUTTON_LEFT << 3 | MOUSE_TYPE_UP;
    let right_down = MOUSE_BUTTON_RIGHT << 3 | MOUSE_TYPE_DOWN;
    let right_up = MOUSE_BUTTON_RIGHT << 3 | MOUSE_TYPE_UP;
    send_mouse(left_up, 0, 0, false, false, false, false, interface);
    std::thread::sleep(Duration::from_millis(50));
    send_mouse(0, 0, 0, false, false, false, false, interface);
    std::thread::sleep(Duration::from_millis(50));
    send_mouse(0, 3, 3, false, false, false, false, interface);
    let (click_down, click_up) = if send_left_click {
        (left_down, left_up)
    } else {
        (right_down, right_up)
    };
    std::thread::sleep(Duration::from_millis(50));
    send_mouse(click_down, 0, 0, false, false, false, false, interface);
    send_mouse(click_up, 0, 0, false, false, false, false, interface);
    /*
    let mut key_event = KeyEvent::new();
    // do not use Esc, which has problem with Linux
    key_event.set_control_key(ControlKey::RightArrow);
    key_event.press = true;
    let mut msg_out = Message::new();
    msg_out.set_key_event(key_event.clone());
    interface.send(Data::Message(msg_out.clone()));
    */
}

/// Input the OS's password.
///
/// # Arguments
///
/// * `p` - The password.
/// * `activate` - Whether to activate OS.
/// * `interface` - The interface for sending data.
pub fn input_os_password(p: String, activate: bool, interface: impl Interface) {
    std::thread::spawn(move || {
        _input_os_password(p, activate, interface);
    });
}

/// Input the OS's password.
///
/// # Arguments
///
/// * `p` - The password.
/// * `activate` - Whether to activate OS.
/// * `interface` - The interface for sending data.
fn _input_os_password(p: String, activate: bool, interface: impl Interface) {
    let input_password = !p.is_empty();
    if activate {
        // Click event is used to bring up the password input box.
        activate_os(&interface, input_password);
        std::thread::sleep(Duration::from_millis(1200));
    }
    if !input_password {
        return;
    }
    let mut key_event = KeyEvent::new();
    key_event.press = true;
    let mut msg_out = Message::new();
    key_event.set_seq(p);
    msg_out.set_key_event(key_event.clone());
    interface.send(Data::Message(msg_out.clone()));
    key_event.set_control_key(ControlKey::Return);
    msg_out.set_key_event(key_event);
    interface.send(Data::Message(msg_out));
}

#[derive(Copy, Clone)]
struct LoginErrorMsgBox {
    msgtype: &'static str,
    title: &'static str,
    text: &'static str,
    link: &'static str,
    try_again: bool,
}

lazy_static::lazy_static! {
    static ref LOGIN_ERROR_MAP: Arc<HashMap<&'static str, LoginErrorMsgBox>> = {
        use config::LINK_HEADLESS_LINUX_SUPPORT;
        let map = HashMap::from([(LOGIN_SCREEN_WAYLAND, LoginErrorMsgBox{
            msgtype: "error",
            title: "Login Error",
            text: "Login screen using Wayland is not supported",
            link: "https://rustdesk.com/docs/en/manual/linux/#login-screen",
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_SESSION_NOT_READY, LoginErrorMsgBox{
            msgtype: "session-login",
            title: "",
            text: "",
            link: "",
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_XSESSION_FAILED, LoginErrorMsgBox{
            msgtype: "session-re-login",
            title: "",
            text: "",
            link: "",
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_SESSION_ANOTHER_USER, LoginErrorMsgBox{
            msgtype: "info-nocancel",
            title: "another_user_login_title_tip",
            text: "another_user_login_text_tip",
            link: "",
            try_again: false,
        }), (LOGIN_MSG_DESKTOP_XORG_NOT_FOUND, LoginErrorMsgBox{
            msgtype: "info-nocancel",
            title: "xorg_not_found_title_tip",
            text: "xorg_not_found_text_tip",
            link: LINK_HEADLESS_LINUX_SUPPORT,
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_NO_DESKTOP, LoginErrorMsgBox{
            msgtype: "info-nocancel",
            title: "no_desktop_title_tip",
            text: "no_desktop_text_tip",
            link: LINK_HEADLESS_LINUX_SUPPORT,
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_SESSION_NOT_READY_PASSWORD_EMPTY, LoginErrorMsgBox{
            msgtype: "session-login-password",
            title: "",
            text: "",
            link: "",
            try_again: true,
        }), (LOGIN_MSG_DESKTOP_SESSION_NOT_READY_PASSWORD_WRONG, LoginErrorMsgBox{
            msgtype: "session-login-re-password",
            title: "",
            text: "",
            link: "",
            try_again: true,
        }), (LOGIN_MSG_NO_PASSWORD_ACCESS, LoginErrorMsgBox{
            msgtype: "wait-remote-accept-nook",
            title: "Prompt",
            text: "Please wait for the remote side to accept your session request...",
            link: "",
            try_again: true,
        })]);
        Arc::new(map)
    };
}

/// Handle login error.
/// Return true if the password is wrong, return false if there's an actual error.
pub fn handle_login_error(
    lc: Arc<RwLock<LoginConfigHandler>>,
    err: &str,
    interface: &impl Interface,
) -> bool {
    if err == LOGIN_MSG_PASSWORD_EMPTY {
        lc.write().unwrap().password = Default::default();
        interface.msgbox("input-password", "Password Required", "", "");
        true
    } else if err == LOGIN_MSG_PASSWORD_WRONG {
        lc.write().unwrap().password = Default::default();
        interface.msgbox("re-input-password", err, "Do you want to enter again?", "");
        true
    } else if err == LOGIN_MSG_2FA_WRONG || err == REQUIRE_2FA {
        let enabled = lc.read().unwrap().get_option("trust-this-device") == "Y";
        if enabled {
            lc.write()
                .unwrap()
                .set_option("trust-this-device".to_string(), "".to_string());
        }
        interface.msgbox("input-2fa", err, "", "");
        true
    } else if LOGIN_ERROR_MAP.contains_key(err) {
        if let Some(msgbox_info) = LOGIN_ERROR_MAP.get(err) {
            interface.msgbox(
                msgbox_info.msgtype,
                msgbox_info.title,
                msgbox_info.text,
                msgbox_info.link,
            );
            msgbox_info.try_again
        } else {
            // unreachable!
            false
        }
    } else {
        if err.contains(SCRAP_X11_REQUIRED) {
            interface.msgbox("error", "Login Error", err, SCRAP_X11_REF_URL);
        } else {
            interface.msgbox("error", "Login Error", err, "");
        }
        false
    }
}

/// Handle hash message sent by peer.
/// Hash will be used for login.
///
/// # Arguments
///
/// * `lc` - Login config.
/// * `hash` - Hash sent by peer.
/// * `interface` - [`Interface`] for sending data.
/// * `peer` - [`Stream`] for communicating with peer.
pub async fn handle_hash(
    lc: Arc<RwLock<LoginConfigHandler>>,
    password_preset: &str,
    hash: Hash,
    interface: &impl Interface,
    peer: &mut Stream,
) {
    lc.write().unwrap().hash = hash.clone();
    // Take care of password application order

    // switch_uuid
    let uuid = lc.write().unwrap().switch_uuid.take();
    if let Some(uuid) = uuid {
        if let Ok(uuid) = uuid::Uuid::from_str(&uuid) {
            send_switch_login_request(lc.clone(), peer, uuid).await;
            lc.write().unwrap().password_source = Default::default();
            return;
        }
    }
    // last password
    let mut password = lc.read().unwrap().password.clone();
    // preset password
    if password.is_empty() {
        if !password_preset.is_empty() {
            let mut hasher = Sha256::new();
            hasher.update(password_preset);
            hasher.update(&hash.salt);
            let res = hasher.finalize();
            password = res[..].into();
            lc.write().unwrap().password_source = Default::default();
        }
    }
    // shared password
    // Currently it's used only when click shared ab peer card
    let shared_password = lc.write().unwrap().shared_password.take();
    if let Some(shared_password) = shared_password {
        if !shared_password.is_empty() {
            let mut hasher = Sha256::new();
            hasher.update(shared_password.clone());
            hasher.update(&hash.salt);
            let res = hasher.finalize();
            password = res[..].into();
            lc.write().unwrap().password_source = PasswordSource::SharedAb(shared_password);
        }
    }
    // peer config password
    if password.is_empty() {
        password = lc.read().unwrap().config.password.clone();
        if !password.is_empty() {
            lc.write().unwrap().password_source = Default::default();
        }
    }
    // personal ab password
    if password.is_empty() {
        try_get_password_from_personal_ab(lc.clone(), &mut password);
    }

    if password.is_empty() {
        let p =
            crate::ui_interface::get_builtin_option(config::keys::OPTION_DEFAULT_CONNECT_PASSWORD);
        if !p.is_empty() {
            let mut hasher = Sha256::new();
            hasher.update(p.clone());
            hasher.update(&hash.salt);
            let res = hasher.finalize();
            password = res[..].into();
            lc.write().unwrap().password_source = PasswordSource::SharedAb(p); // reuse SharedAb here
        }
    }

    lc.write().unwrap().password = password.clone();
    let password = if password.is_empty() {
        // login without password, the remote side can click accept
        interface.msgbox("input-password", "Password Required", "", "");
        Vec::new()
    } else {
        let mut hasher = Sha256::new();
        hasher.update(&password);
        hasher.update(&hash.challenge);
        hasher.finalize()[..].into()
    };

    let os_username = lc.read().unwrap().get_option("os-username");
    let os_password = lc.read().unwrap().get_option("os-password");

    send_login(lc.clone(), os_username, os_password, password, peer).await;
    lc.write().unwrap().hash = hash;
}

#[inline]
fn try_get_password_from_personal_ab(lc: Arc<RwLock<LoginConfigHandler>>, password: &mut Vec<u8>) {
    let access_token = LocalConfig::get_option("access_token");
    let ab = config::Ab::load();
    if !access_token.is_empty() && access_token == ab.access_token {
        let id = lc.read().unwrap().id.clone();
        if let Some(ab) = ab.ab_entries.iter().find(|a| a.personal()) {
            if let Some(p) = ab
                .peers
                .iter()
                .find_map(|p| if p.id == id { Some(p) } else { None })
            {
                if let Ok(hash_password) = base64::decode(p.hash.clone(), base64::Variant::Original)
                {
                    if !hash_password.is_empty() {
                        *password = hash_password.clone();
                        lc.write().unwrap().password_source =
                            PasswordSource::PersonalAb(hash_password);
                    }
                }
            }
        }
    }
}

/// Send login message to peer.
///
/// # Arguments
///
/// * `lc` - Login config.
/// * `os_username` - OS username.
/// * `os_password` - OS password.
/// * `password` - Password.
/// * `peer` - [`Stream`] for communicating with peer.
async fn send_login(
    lc: Arc<RwLock<LoginConfigHandler>>,
    os_username: String,
    os_password: String,
    password: Vec<u8>,
    peer: &mut Stream,
) {
    let msg_out = lc
        .read()
        .unwrap()
        .create_login_msg(os_username, os_password, password);
    allow_err!(peer.send(&msg_out).await);
}

/// Handle login request made from ui.
///
/// # Arguments
///
/// * `lc` - Login config.
/// * `os_username` - OS username.
/// * `os_password` - OS password.
/// * `password` - Password.
/// * `remember` - Whether to remember password.
/// * `peer` - [`Stream`] for communicating with peer.
pub async fn handle_login_from_ui(
    lc: Arc<RwLock<LoginConfigHandler>>,
    os_username: String,
    os_password: String,
    password: String,
    remember: bool,
    peer: &mut Stream,
) {
    let mut hash_password = if password.is_empty() {
        let mut password2 = lc.read().unwrap().password.clone();
        if password2.is_empty() {
            password2 = lc.read().unwrap().config.password.clone();
            if !password2.is_empty() {
                lc.write().unwrap().password_source = Default::default();
            }
        }
        password2
    } else {
        lc.write().unwrap().password_source = Default::default();
        let mut hasher = Sha256::new();
        hasher.update(password);
        hasher.update(&lc.read().unwrap().hash.salt);
        let res = hasher.finalize();
        lc.write().unwrap().remember = remember;
        res[..].into()
    };
    lc.write().unwrap().password = hash_password.clone();
    let mut hasher2 = Sha256::new();
    hasher2.update(&hash_password[..]);
    hasher2.update(&lc.read().unwrap().hash.challenge);
    hash_password = hasher2.finalize()[..].to_vec();

    send_login(lc.clone(), os_username, os_password, hash_password, peer).await;
}

async fn send_switch_login_request(
    lc: Arc<RwLock<LoginConfigHandler>>,
    peer: &mut Stream,
    uuid: Uuid,
) {
    let mut msg_out = Message::new();
    msg_out.set_switch_sides_response(SwitchSidesResponse {
        uuid: Bytes::from(uuid.as_bytes().to_vec()),
        lr: hbb_common::protobuf::MessageField::some(
            lc.read()
                .unwrap()
                .create_login_msg("".to_owned(), "".to_owned(), vec![])
                .login_request()
                .to_owned(),
        ),
        ..Default::default()
    });
    allow_err!(peer.send(&msg_out).await);
}

/// Interface for client to send data and commands.
#[async_trait]
pub trait Interface: Send + Clone + 'static + Sized {
    /// Send message data to remote peer.
    fn send(&self, data: Data);
    fn msgbox(&self, msgtype: &str, title: &str, text: &str, link: &str);
    fn handle_login_error(&self, err: &str) -> bool;
    fn handle_peer_info(&self, pi: PeerInfo);
    fn set_multiple_windows_session(&self, sessions: Vec<WindowsSession>);
    fn on_error(&self, err: &str) {
        self.msgbox("error", "Error", err, "");
    }
    async fn handle_hash(&self, pass: &str, hash: Hash, peer: &mut Stream);
    async fn handle_login_from_ui(
        &self,
        os_username: String,
        os_password: String,
        password: String,
        remember: bool,
        peer: &mut Stream,
    );
    async fn handle_test_delay(&self, t: TestDelay, peer: &mut Stream);

    fn get_lch(&self) -> Arc<RwLock<LoginConfigHandler>>;

    fn get_id(&self) -> String {
        self.get_lch().read().unwrap().id.clone()
    }

    fn is_force_relay(&self) -> bool {
        self.get_lch().read().unwrap().force_relay
    }

    fn swap_modifier_mouse(&self, _msg: &mut hbb_common::protos::message::MouseEvent) {}

    fn update_direct(&self, direct: Option<bool>) {
        self.get_lch().write().unwrap().direct = direct;
    }

    fn update_received(&self, received: bool) {
        self.get_lch().write().unwrap().received = received;
    }

    fn on_establish_connection_error(&self, err: String) {
        let title = "Connection Error";
        let text = err.to_string();
        let lc = self.get_lch();
        let direct = lc.read().unwrap().direct;
        let received = lc.read().unwrap().received;

        let mut relay_hint = false;
        let mut relay_hint_type = "relay-hint";
        // force relay
        let errno = errno::errno().0;
        log::error!("Connection closed: {err}({errno})");
        if direct == Some(true)
            && ((cfg!(windows) && (errno == 10054 || err.contains("10054")))
                || (!cfg!(windows) && (errno == 104 || err.contains("104")))
                || (!err.contains("Failed") && err.contains("deadline")))
        // deadline: https://github.com/rustdesk/rustdesk-server-pro/discussions/325, most likely comes from secure tcp timeout
        {
            relay_hint = true;
            if !received {
                relay_hint_type = "relay-hint2"
            }
        }

        // relay-hint
        if cfg!(feature = "flutter") && relay_hint {
            self.msgbox(relay_hint_type, title, &text, "");
        } else {
            self.msgbox("error", title, &text, "");
        }
    }
}

/// Data used by the client interface.
#[derive(Clone)]
pub enum Data {
    Close,
    Login((String, String, String, bool)),
    Message(Message),
    SendFiles((i32, String, String, i32, bool, bool)),
    RemoveDirAll((i32, String, bool, bool)),
    ConfirmDeleteFiles((i32, i32)),
    SetNoConfirm(i32),
    RemoveDir((i32, String)),
    RemoveFile((i32, String, i32, bool)),
    CreateDir((i32, String, bool)),
    CancelJob(i32),
    RemovePortForward(i32),
    AddPortForward((i32, String, i32)),
    #[cfg(not(feature = "flutter"))]
    ToggleClipboardFile,
    NewRDP,
    SetConfirmOverrideFile((i32, i32, bool, bool, bool)),
    AddJob((i32, String, String, i32, bool, bool)),
    ResumeJob((i32, bool)),
    RecordScreen(bool, usize, i32, i32, String),
    ElevateDirect,
    ElevateWithLogon(String, String),
    NewVoiceCall,
    CloseVoiceCall,
    ResetDecoder(Option<usize>),
    RenameFile((i32, String, String, bool)),
}

/// Keycode for key events.
#[derive(Clone, Debug)]
pub enum Key {
    ControlKey(ControlKey),
    Chr(u32),
    _Raw(u32),
}

lazy_static::lazy_static! {
    pub static ref KEY_MAP: HashMap<&'static str, Key> =
    [
        ("VK_A", Key::Chr('a' as _)),
        ("VK_B", Key::Chr('b' as _)),
        ("VK_C", Key::Chr('c' as _)),
        ("VK_D", Key::Chr('d' as _)),
        ("VK_E", Key::Chr('e' as _)),
        ("VK_F", Key::Chr('f' as _)),
        ("VK_G", Key::Chr('g' as _)),
        ("VK_H", Key::Chr('h' as _)),
        ("VK_I", Key::Chr('i' as _)),
        ("VK_J", Key::Chr('j' as _)),
        ("VK_K", Key::Chr('k' as _)),
        ("VK_L", Key::Chr('l' as _)),
        ("VK_M", Key::Chr('m' as _)),
        ("VK_N", Key::Chr('n' as _)),
        ("VK_O", Key::Chr('o' as _)),
        ("VK_P", Key::Chr('p' as _)),
        ("VK_Q", Key::Chr('q' as _)),
        ("VK_R", Key::Chr('r' as _)),
        ("VK_S", Key::Chr('s' as _)),
        ("VK_T", Key::Chr('t' as _)),
        ("VK_U", Key::Chr('u' as _)),
        ("VK_V", Key::Chr('v' as _)),
        ("VK_W", Key::Chr('w' as _)),
        ("VK_X", Key::Chr('x' as _)),
        ("VK_Y", Key::Chr('y' as _)),
        ("VK_Z", Key::Chr('z' as _)),
        ("VK_0", Key::Chr('0' as _)),
        ("VK_1", Key::Chr('1' as _)),
        ("VK_2", Key::Chr('2' as _)),
        ("VK_3", Key::Chr('3' as _)),
        ("VK_4", Key::Chr('4' as _)),
        ("VK_5", Key::Chr('5' as _)),
        ("VK_6", Key::Chr('6' as _)),
        ("VK_7", Key::Chr('7' as _)),
        ("VK_8", Key::Chr('8' as _)),
        ("VK_9", Key::Chr('9' as _)),
        ("VK_COMMA", Key::Chr(',' as _)),
        ("VK_SLASH", Key::Chr('/' as _)),
        ("VK_SEMICOLON", Key::Chr(';' as _)),
        ("VK_QUOTE", Key::Chr('\'' as _)),
        ("VK_LBRACKET", Key::Chr('[' as _)),
        ("VK_RBRACKET", Key::Chr(']' as _)),
        ("VK_BACKSLASH", Key::Chr('\\' as _)),
        ("VK_MINUS", Key::Chr('-' as _)),
        ("VK_PLUS", Key::Chr('=' as _)), // it is =, but sciter return VK_PLUS
        ("VK_DIVIDE", Key::ControlKey(ControlKey::Divide)), // numpad
        ("VK_MULTIPLY", Key::ControlKey(ControlKey::Multiply)), // numpad
        ("VK_SUBTRACT", Key::ControlKey(ControlKey::Subtract)), // numpad
        ("VK_ADD", Key::ControlKey(ControlKey::Add)), // numpad
        ("VK_DECIMAL", Key::ControlKey(ControlKey::Decimal)), // numpad
        ("VK_F1", Key::ControlKey(ControlKey::F1)),
        ("VK_F2", Key::ControlKey(ControlKey::F2)),
        ("VK_F3", Key::ControlKey(ControlKey::F3)),
        ("VK_F4", Key::ControlKey(ControlKey::F4)),
        ("VK_F5", Key::ControlKey(ControlKey::F5)),
        ("VK_F6", Key::ControlKey(ControlKey::F6)),
        ("VK_F7", Key::ControlKey(ControlKey::F7)),
        ("VK_F8", Key::ControlKey(ControlKey::F8)),
        ("VK_F9", Key::ControlKey(ControlKey::F9)),
        ("VK_F10", Key::ControlKey(ControlKey::F10)),
        ("VK_F11", Key::ControlKey(ControlKey::F11)),
        ("VK_F12", Key::ControlKey(ControlKey::F12)),
        ("VK_ENTER", Key::ControlKey(ControlKey::Return)),
        ("VK_CANCEL", Key::ControlKey(ControlKey::Cancel)),
        ("VK_BACK", Key::ControlKey(ControlKey::Backspace)),
        ("VK_TAB", Key::ControlKey(ControlKey::Tab)),
        ("VK_CLEAR", Key::ControlKey(ControlKey::Clear)),
        ("VK_RETURN", Key::ControlKey(ControlKey::Return)),
        ("VK_SHIFT", Key::ControlKey(ControlKey::Shift)),
        ("VK_CONTROL", Key::ControlKey(ControlKey::Control)),
        ("VK_MENU", Key::ControlKey(ControlKey::Alt)),
        ("VK_PAUSE", Key::ControlKey(ControlKey::Pause)),
        ("VK_CAPITAL", Key::ControlKey(ControlKey::CapsLock)),
        ("VK_KANA", Key::ControlKey(ControlKey::Kana)),
        ("VK_HANGUL", Key::ControlKey(ControlKey::Hangul)),
        ("VK_JUNJA", Key::ControlKey(ControlKey::Junja)),
        ("VK_FINAL", Key::ControlKey(ControlKey::Final)),
        ("VK_HANJA", Key::ControlKey(ControlKey::Hanja)),
        ("VK_KANJI", Key::ControlKey(ControlKey::Kanji)),
        ("VK_ESCAPE", Key::ControlKey(ControlKey::Escape)),
        ("VK_CONVERT", Key::ControlKey(ControlKey::Convert)),
        ("VK_SPACE", Key::ControlKey(ControlKey::Space)),
        ("VK_PRIOR", Key::ControlKey(ControlKey::PageUp)),
        ("VK_NEXT", Key::ControlKey(ControlKey::PageDown)),
        ("VK_END", Key::ControlKey(ControlKey::End)),
        ("VK_HOME", Key::ControlKey(ControlKey::Home)),
        ("VK_LEFT", Key::ControlKey(ControlKey::LeftArrow)),
        ("VK_UP", Key::ControlKey(ControlKey::UpArrow)),
        ("VK_RIGHT", Key::ControlKey(ControlKey::RightArrow)),
        ("VK_DOWN", Key::ControlKey(ControlKey::DownArrow)),
        ("VK_SELECT", Key::ControlKey(ControlKey::Select)),
        ("VK_PRINT", Key::ControlKey(ControlKey::Print)),
        ("VK_EXECUTE", Key::ControlKey(ControlKey::Execute)),
        ("VK_SNAPSHOT", Key::ControlKey(ControlKey::Snapshot)),
        ("VK_INSERT", Key::ControlKey(ControlKey::Insert)),
        ("VK_DELETE", Key::ControlKey(ControlKey::Delete)),
        ("VK_HELP", Key::ControlKey(ControlKey::Help)),
        ("VK_SLEEP", Key::ControlKey(ControlKey::Sleep)),
        ("VK_SEPARATOR", Key::ControlKey(ControlKey::Separator)),
        ("VK_NUMPAD0", Key::ControlKey(ControlKey::Numpad0)),
        ("VK_NUMPAD1", Key::ControlKey(ControlKey::Numpad1)),
        ("VK_NUMPAD2", Key::ControlKey(ControlKey::Numpad2)),
        ("VK_NUMPAD3", Key::ControlKey(ControlKey::Numpad3)),
        ("VK_NUMPAD4", Key::ControlKey(ControlKey::Numpad4)),
        ("VK_NUMPAD5", Key::ControlKey(ControlKey::Numpad5)),
        ("VK_NUMPAD6", Key::ControlKey(ControlKey::Numpad6)),
        ("VK_NUMPAD7", Key::ControlKey(ControlKey::Numpad7)),
        ("VK_NUMPAD8", Key::ControlKey(ControlKey::Numpad8)),
        ("VK_NUMPAD9", Key::ControlKey(ControlKey::Numpad9)),
        ("Apps", Key::ControlKey(ControlKey::Apps)),
        ("Meta", Key::ControlKey(ControlKey::Meta)),
        ("RAlt", Key::ControlKey(ControlKey::RAlt)),
        ("RWin", Key::ControlKey(ControlKey::RWin)),
        ("RControl", Key::ControlKey(ControlKey::RControl)),
        ("RShift", Key::ControlKey(ControlKey::RShift)),
        ("CTRL_ALT_DEL", Key::ControlKey(ControlKey::CtrlAltDel)),
        ("LOCK_SCREEN", Key::ControlKey(ControlKey::LockScreen)),
    ].iter().cloned().collect();
}

/// Check if the given message is an error and can be retried.
///
/// # Arguments
///
/// * `msgtype` - The message type.
/// * `title` - The title of the message.
/// * `text` - The text of the message.
#[inline]
pub fn check_if_retry(msgtype: &str, title: &str, text: &str, retry_for_relay: bool) -> bool {
    msgtype == "error"
        && title == "Connection Error"
        && ((text.contains("10054") || text.contains("104")) && retry_for_relay
            || (!text.to_lowercase().contains("offline")
                && !text.to_lowercase().contains("exist")
                && !text.to_lowercase().contains("handshake")
                && !text.to_lowercase().contains("failed")
                && !text.to_lowercase().contains("resolve")
                && !text.to_lowercase().contains("mismatch")
                && !text.to_lowercase().contains("manually")
                && !text.to_lowercase().contains("not allowed")))
}

pub async fn hc_connection(
    feedback: i32,
    rendezvous_server: String,
    token: &str,
) -> Option<tokio::sync::mpsc::UnboundedSender<()>> {
    if feedback == 0 || rendezvous_server.is_empty() || token.is_empty() {
        return None;
    }
    let (tx, rx) = unbounded_channel::<()>();
    let token = token.to_owned();
    tokio::spawn(async move {
        allow_err!(hc_connection_(rendezvous_server, rx, token).await);
    });
    Some(tx)
}

async fn hc_connection_(
    rendezvous_server: String,
    mut rx: UnboundedReceiver<()>,
    token: String,
) -> ResultType<()> {
    let mut timer = crate::rustdesk_interval(interval(crate::TIMER_OUT));
    let mut last_recv_msg = Instant::now();
    let mut keep_alive = crate::DEFAULT_KEEP_ALIVE;

    let host = check_port(&rendezvous_server, RENDEZVOUS_PORT);
    let mut conn = connect_tcp(host.clone(), CONNECT_TIMEOUT).await?;
    let key = crate::get_key(true).await;
    crate::secure_tcp(&mut conn, &key).await?;
    let mut msg_out = RendezvousMessage::new();
    msg_out.set_hc(HealthCheck {
        token,
        ..Default::default()
    });
    conn.send(&msg_out).await?;
    loop {
        tokio::select! {
            res = rx.recv() => {
                if res.is_none() {
                    log::debug!("HC connection is closed as controlling connection exits");
                    break;
                }
            }
            res = conn.next() => {
                last_recv_msg = Instant::now();
                let bytes = res.ok_or_else(|| anyhow!("Rendezvous connection is reset by the peer"))??;
                if bytes.is_empty() {
                    conn.send_bytes(bytes::Bytes::new()).await?;
                    continue; // heartbeat
                }
                let msg = RendezvousMessage::parse_from_bytes(&bytes)?;
                match msg.union {
                    Some(rendezvous_message::Union::RegisterPkResponse(rpr)) => {
                        if rpr.keep_alive > 0 {
                            keep_alive = rpr.keep_alive * 1000;
                            log::info!("keep_alive: {}ms", keep_alive);
                        }
                    }
                    _ => {}
                }
            }
            _  = timer.tick() => {
                // https://www.emqx.com/en/blog/mqtt-keep-alive
                if last_recv_msg.elapsed().as_millis() as u64 > keep_alive as u64 * 3 / 2 {
                    bail!("HC connection is timeout");
                }
            }
        }
    }
    Ok(())
}

pub mod peer_online {
    use hbb_common::{
        anyhow::bail,
        config::{Config, CONNECT_TIMEOUT, READ_TIMEOUT},
        log,
        rendezvous_proto::*,
        sleep,
        socket_client::connect_tcp,
        tcp::FramedStream,
        ResultType,
    };

    pub async fn query_online_states<F: FnOnce(Vec<String>, Vec<String>)>(ids: Vec<String>, f: F) {
        let test = false;
        if test {
            sleep(1.5).await;
            let mut onlines = ids;
            let offlines = onlines.drain((onlines.len() / 2)..).collect();
            f(onlines, offlines)
        } else {
            let query_timeout = std::time::Duration::from_millis(3_000);
            match query_online_states_(&ids, query_timeout).await {
                Ok((onlines, offlines)) => {
                    f(onlines, offlines);
                }
                Err(e) => {
                    log::debug!("query onlines, {}", &e);
                }
            }
        }
    }

    async fn create_online_stream() -> ResultType<FramedStream> {
        let (rendezvous_server, _servers, _contained) =
            crate::get_rendezvous_server(READ_TIMEOUT).await;
        let tmp: Vec<&str> = rendezvous_server.split(":").collect();
        if tmp.len() != 2 {
            bail!("Invalid server address: {}", rendezvous_server);
        }
        let port: u16 = tmp[1].parse()?;
        if port == 0 {
            bail!("Invalid server address: {}", rendezvous_server);
        }
        let online_server = format!("{}:{}", tmp[0], port - 1);
        connect_tcp(online_server, CONNECT_TIMEOUT).await
    }

    async fn query_online_states_(
        ids: &Vec<String>,
        timeout: std::time::Duration,
    ) -> ResultType<(Vec<String>, Vec<String>)> {
        let mut msg_out = RendezvousMessage::new();
        msg_out.set_online_request(OnlineRequest {
            id: Config::get_id(),
            peers: ids.clone(),
            ..Default::default()
        });

        let mut socket = match create_online_stream().await {
            Ok(s) => s,
            Err(e) => {
                log::debug!("Failed to create peers online stream, {e}");
                return Ok((vec![], ids.clone()));
            }
        };
        // TODO: Use long connections to avoid socket creation
        // If we use a Arc<Mutex<Option<FramedStream>>> to hold and reuse the previous socket,
        // we may face the following error:
        // An established connection was aborted by the software in your host machine. (os error 10053)
        if let Err(e) = socket.send(&msg_out).await {
            log::debug!("Failed to send peers online states query, {e}");
            return Ok((vec![], ids.clone()));
        }
        // Retry for 2 times to get the online response
        for _ in 0..2 {
            if let Some(msg_in) = crate::common::get_next_nonkeyexchange_msg(
                &mut socket,
                Some(timeout.as_millis() as _),
            )
            .await
            {
                match msg_in.union {
                    Some(rendezvous_message::Union::OnlineResponse(online_response)) => {
                        let states = online_response.states;
                        let mut onlines = Vec::new();
                        let mut offlines = Vec::new();
                        for i in 0..ids.len() {
                            // bytes index from left to right
                            let bit_value = 0x01 << (7 - i % 8);
                            if (states[i / 8] & bit_value) == bit_value {
                                onlines.push(ids[i].clone());
                            } else {
                                offlines.push(ids[i].clone());
                            }
                        }
                        return Ok((onlines, offlines));
                    }
                    _ => {
                        // ignore
                    }
                }
            } else {
                // TODO: Make sure socket closed?
                bail!("Online stream receives None");
            }
        }

        bail!("Failed to query online states, no online response");
    }

    #[cfg(test)]
    mod tests {
        use hbb_common::tokio;

        #[tokio::test]
        async fn test_query_onlines() {
            super::query_online_states(
                vec![
                    "152183996".to_owned(),
                    "165782066".to_owned(),
                    "155323351".to_owned(),
                    "460952777".to_owned(),
                ],
                |onlines: Vec<String>, offlines: Vec<String>| {
                    println!("onlines: {:?}, offlines: {:?}", &onlines, &offlines);
                },
            )
            .await;
        }
    }
}