use anyhow::{Context, Result};
use navka_common::navka::{relay_client::RelayClient, HidReport};
use tokio::sync::mpsc;
use tokio_stream::wrappers::ReceiverStream;
use tonic::Request;
use crate::input::keyboard::KeyboardAggregator;

pub struct NavkaClientApp {
    server_addr: String,
}

impl NavkaClientApp {
    pub fn new() -> Result<Self> {
        let addr = std::env::args()
            .nth(1)
            .or_else(|| std::env::var("NAVKA_SERVER_ADDR").ok())
            .unwrap_or_else(|| "http://127.0.0.1:50051".to_owned());
        
        Ok(Self { server_addr: addr })
    }

    pub async fn run(&mut self) -> Result<()> {
        // 1) Connect to navka-server
        let mut client = RelayClient::connect(self.server_addr.clone())
            .await
            .with_context(|| format!("failed to connect to {}", self.server_addr))?;

        // 2) Create a bidirectional streaming stub
        let (tx, rx) = mpsc::channel::<HidReport>(32);
        let outbound = ReceiverStream::new(rx);
        let response = client.stream(Request::new(outbound)).await?;
        let mut inbound = response.into_inner();

        // 3) Start reading from all keyboards in a background task
        let mut aggregator = KeyboardAggregator::new(tx.clone());
        aggregator.init_devices()?; // discover & grab
        let input_task = tokio::spawn(async move {
            if let Err(e) = aggregator.run().await {
                tracing::error!("KeyboardAggregator failed: {e}");
            }
        });

        // 4) Inbound loop: we do something with reports from the server, e.g. logging:
        while let Some(report) = inbound.message().await? {
            tracing::info!(?report.data, "echo from server");
        }

        // 5) If inbound stream ends, stop the input task
        input_task.abort();
        Ok(())
    }
}