// client/src/handshake.rs
#![forbid(unsafe_code)]

use lesavka_common::lesavka::{self as pb, handshake_client::HandshakeClient};
use std::time::Duration;
use tokio::time::timeout;
use tonic::{Code, transport::Endpoint};
use tracing::{info, warn};

#[derive(Default, Clone, Debug)]
pub struct PeerCaps {
    pub camera: bool,
    pub microphone: bool,
    pub camera_output: Option<String>,
    pub camera_codec: Option<String>,
    pub camera_width: Option<u32>,
    pub camera_height: Option<u32>,
    pub camera_fps: Option<u32>,
}

pub async fn negotiate(uri: &str) -> PeerCaps {
    info!(%uri, "🤝 dial handshake");

    let ep = Endpoint::from_shared(uri.to_owned())
        .expect("handshake endpoint")
        .tcp_nodelay(true)
        .http2_keep_alive_interval(Duration::from_secs(15))
        .connect_timeout(Duration::from_secs(5));

    let channel = timeout(Duration::from_secs(8), ep.connect())
        .await
        .expect("handshake connect timeout")
        .expect("handshake connect failed");

    info!("🤝 handshake channel connected");
    let mut cli = HandshakeClient::new(channel);
    info!("🤝 fetching capabilities…");

    match timeout(Duration::from_secs(5), cli.get_capabilities(pb::Empty {})).await {
        Ok(Ok(rsp)) => {
            let rsp = rsp.get_ref();
            let caps = PeerCaps {
                camera: rsp.camera,
                microphone: rsp.microphone,
                camera_output: if rsp.camera_output.is_empty() {
                    None
                } else {
                    Some(rsp.camera_output.clone())
                },
                camera_codec: if rsp.camera_codec.is_empty() {
                    None
                } else {
                    Some(rsp.camera_codec.clone())
                },
                camera_width: if rsp.camera_width == 0 {
                    None
                } else {
                    Some(rsp.camera_width)
                },
                camera_height: if rsp.camera_height == 0 {
                    None
                } else {
                    Some(rsp.camera_height)
                },
                camera_fps: if rsp.camera_fps == 0 {
                    None
                } else {
                    Some(rsp.camera_fps)
                },
            };
            info!(?caps, "🤝 handshake ok");
            caps
        }
        Ok(Err(e)) if e.code() == Code::Unimplemented => {
            warn!("🤝 handshake not implemented on server – assuming defaults");
            PeerCaps::default()
        }
        Ok(Err(e)) => {
            warn!("🤝 handshake failed: {e} – assuming defaults");
            PeerCaps::default()
        }
        Err(_) => {
            warn!("🤝 handshake timed out – assuming defaults");
            PeerCaps::default()
        }
    }
}