// client/src/app.rs

#![forbid(unsafe_code)]

use anyhow::Result;
use std::time::Duration;
use tokio::{sync::broadcast, task::JoinHandle};
use tokio_stream::{wrappers::BroadcastStream, StreamExt};
use tonic::Request;
use tracing::{debug, error, info, warn};

use navka_common::navka::{relay_client::RelayClient, KeyboardReport, MouseReport};

use crate::input::inputs::InputAggregator;

pub struct NavkaClientApp {
    aggregator: Option<InputAggregator>,
    server_addr: String,
    dev_mode: bool,
    kbd_tx: broadcast::Sender<KeyboardReport>,
    mou_tx: broadcast::Sender<MouseReport>,
}

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

        let (kbd_tx, _) = broadcast::channel::<KeyboardReport>(1024);
        let (mou_tx, _) = broadcast::channel::<MouseReport>(4096);

        let mut agg = InputAggregator::new(dev_mode, kbd_tx.clone(), mou_tx.clone());
        agg.init()?; // grab devices

        Ok(Self { aggregator: Some(agg),
                  server_addr, dev_mode,
                  kbd_tx, mou_tx })
    }

    pub async fn run(&mut self) -> Result<()> {
        /* detach the aggregator before spawn so `self` is not moved */
        let aggregator = self.aggregator.take().expect("InputAggregator present");
        let agg_task = tokio::spawn(async move { aggregator.run().await });

        /* two networking tasks */
        let kbd_loop = self.stream_loop_keyboard();
        let mou_loop = self.stream_loop_mouse();

        /* optional suicide timer */
        let suicide = async {
            if self.dev_mode {
                tokio::time::sleep(Duration::from_secs(30)).await;
                warn!("dev‑mode timeout");
                std::process::exit(0);
            } else { futures::future::pending::<()>().await }
        };

        tokio::select! {
            _ = kbd_loop => unreachable!(),
            _ = mou_loop => unreachable!(),
            _ = suicide  => unreachable!(),
            // _ = suicide  => { warn!("dev‑mode timeout"); std::process::exit(0) },
            r = agg_task => {
                error!("aggregator task ended: {r:?}");
                std::process::exit(1)
            }
        }
    }

    /*──────────────── keyboard stream ───────────────*/
    async fn stream_loop_keyboard(&self) {
        loop {
            info!("⌨️  connect {}", self.server_addr);
            let mut cli = match RelayClient::connect(self.server_addr.clone()).await {
                Ok(c) => c,
                Err(e) => { error!("connect: {e}"); Self::delay().await; continue }
            };

            let outbound = BroadcastStream::new(self.kbd_tx.subscribe()).filter_map(|r| r.ok());
            let resp = match cli.stream_keyboard(Request::new(outbound)).await {
                Ok(r) => r, Err(e) => { error!("stream_keyboard: {e}"); Self::delay().await; continue }
            };

            let mut inbound = resp.into_inner();
            while let Some(m) = inbound.message().await.transpose() {
                match m {
                    Ok(r) => debug!("kbd echo {} B", r.data.len()),
                    Err(e) => { error!("kbd inbound: {e}"); break }
                }
            }
            warn!("⌨️  disconnected");
            Self::delay().await;
        }
    }

    /*──────────────── mouse stream ──────────────────*/
    async fn stream_loop_mouse(&self) {
        loop {
            info!("🖱️  connect {}", self.server_addr);
            let mut cli = match RelayClient::connect(self.server_addr.clone()).await {
                Ok(c) => c,
                Err(e) => { error!("connect: {e}"); Self::delay().await; continue }
            };

            let outbound = BroadcastStream::new(self.mou_tx.subscribe()).filter_map(|r| r.ok());
            let resp = match cli.stream_mouse(Request::new(outbound)).await {
                Ok(r) => r, Err(e) => { error!("stream_mouse: {e}"); Self::delay().await; continue }
            };

            let mut inbound = resp.into_inner();
            while let Some(m) = inbound.message().await.transpose() {
                match m {
                    Ok(r) => debug!("mouse echo {} B", r.data.len()),
                    Err(e) => { error!("mouse inbound: {e}"); break }
                }
            }
            warn!("🖱️  disconnected");
            Self::delay().await;
        }
    }

    #[inline(always)]
    async fn delay() { tokio::time::sleep(Duration::from_secs(1)).await; }
}