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//! JSON protocol server implementation

use std::net::SocketAddr;

use futures::prelude::*;
use thiserror::Error;
use tokio::net::TcpStream;
use tokio_util::codec::Framed;

use crate::{
    api::json::{self, JsonApiError},
    global::{Global, InputSourceName},
};

/// JSON protocol codec definition
mod codec;
use codec::*;

#[derive(Debug, Error)]
pub enum JsonServerError {
    #[error("i/o error: {0}")]
    Io(#[from] futures_io::Error),
    #[error("codec error: {0}")]
    Codec(#[from] JsonCodecError),
    #[error(transparent)]
    Api(#[from] JsonApiError),
}

#[instrument(skip(socket, global))]
pub async fn handle_client(
    (socket, peer_addr): (TcpStream, SocketAddr),
    global: Global,
) -> Result<(), JsonServerError> {
    debug!("accepted new connection");

    let framed = Framed::new(socket, JsonCodec::new());
    let (mut writer, mut reader) = framed.split();

    // unwrap: cannot fail because the priority is None
    let mut client_connection = json::ClientConnection::new(
        global
            .register_input_source(InputSourceName::Json { peer_addr }, None)
            .await
            .unwrap(),
    );

    while let Some(request) = reader.next().await {
        trace!(request = ?request, "processing request");

        let mut tan = None;
        let reply = match {
            match request {
                Ok(rq) => {
                    tan = rq.tan;
                    Ok(client_connection.handle_request(rq, &global).await?)
                }
                Err(error) => Err(JsonServerError::from(error)),
            }
        } {
            Ok(response) => response,
            Err(error) => {
                error!(error = %error, "error processing request");

                json::message::HyperionResponse::error(&error)
            }
        }
        .with_tan(tan);

        trace!(response = ?reply, "sending response");

        writer.send(reply).await?;
        writer.flush().await?;
    }

    Ok(())
}