#![forbid(unsafe_code)]

use anyhow::Result;
use std::time::Duration;
use tokio::sync::broadcast;
use tokio_stream::{wrappers::BroadcastStream, StreamExt};
use tonic::{transport::Channel, Request};
use tracing::{error, info, warn};
use winit::{
    event::Event,
    event_loop::EventLoopBuilder,
    platform::wayland::EventLoopBuilderExtWayland,
};

use lesavka_common::lesavka::{
    relay_client::RelayClient, KeyboardReport, MonitorRequest, MouseReport, VideoPacket,
};

use crate::{input::inputs::InputAggregator, output::video::MonitorWindow};

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

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

        let (kbd_tx, _) = broadcast::channel(1024);
        let (mou_tx, _) = broadcast::channel(4096);

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

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

    pub async fn run(&mut self) -> Result<()> {
        /*────────── persistent gRPC channels ──────────*/
        let hid_ep = Channel::from_shared(self.server_addr.clone())?
            .tcp_nodelay(true)
            .concurrency_limit(1)
            .http2_keep_alive_interval(Duration::from_secs(15))
            .connect_lazy();

        let vid_ep = Channel::from_shared(self.server_addr.clone())?
            .initial_connection_window_size(4<<20)
            .initial_stream_window_size(4<<20)
            .tcp_nodelay(true)
            .connect_lazy();

        /*────────── input aggregator task ─────────────*/
        let aggregator = self.aggregator.take().expect("InputAggregator present");
        let agg_task   = tokio::spawn(async move {
            let mut a = aggregator;
            a.run().await
        });

        /*────────── HID streams (never return) ────────*/
        let kbd_loop = self.stream_loop_keyboard(hid_ep.clone());
        let mou_loop = self.stream_loop_mouse(hid_ep.clone());

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

        /*────────── video rendering thread (winit) ────*/
        let (video_tx, mut video_rx) = tokio::sync::mpsc::unbounded_channel::<VideoPacket>();

        std::thread::spawn(move || {
            let el   = EventLoopBuilder::<()>::new().with_any_thread(true).build().unwrap();
            let win0 = MonitorWindow::new(0, &el).expect("win0");
            let win1 = MonitorWindow::new(1, &el).expect("win1");

            let _ = el.run(move |_: Event<()>, _| {
                while let Ok(pkt) = video_rx.try_recv() {
                    match pkt.id {
                        0 => win0.push_packet(pkt),
                        1 => win1.push_packet(pkt),
                        _ => {}
                    }
                }
            });
        });

        /*────────── start video gRPC pullers ──────────*/
        tokio::spawn(Self::video_loop(vid_ep.clone(), video_tx));

        /*────────── central reactor ───────────────────*/
        tokio::select! {
            _ = kbd_loop  => { warn!("⚠️⌨️ keyboard stream finished"); },
            _ = mou_loop  => { warn!("⚠️🖱️ mouse stream finished"); },
            _ = suicide   => { /* handled above */ },
            r = agg_task  => {
                match r {
                    Ok(Ok(()))        => warn!("input aggregator terminated cleanly"),
                    Ok(Err(e))        => error!("input aggregator error: {e:?}"),
                    Err(join_err)     => error!("aggregator task panicked: {join_err:?}"),
                }
                std::process::exit(1);
            }
        }

        // The branches above either loop forever or exit the process; this
        // point is unreachable but satisfies the type checker.
        #[allow(unreachable_code)]
        Ok(())
    }

    /*──────────────── keyboard stream ───────────────*/
    async fn stream_loop_keyboard(&self, ep: Channel) {
        loop {
            info!("⌨️  dial {}", self.server_addr);            // LESAVKA-client
            let mut cli = RelayClient::new(ep.clone());
    
            //  ✅ use kbd_tx here – fixes E0271
            let outbound = BroadcastStream::new(self.kbd_tx.subscribe())
                .filter_map(|r| r.ok());
    
            match cli.stream_keyboard(Request::new(outbound)).await {
                Ok(mut resp) => {
                    while let Some(msg) = resp.get_mut().message().await.transpose() {
                        if let Err(e) = msg { warn!("⌨️  server err: {e}"); break; }
                    }
                }
                Err(e) => warn!("⌨️  connect failed: {e}"),
            }
            tokio::time::sleep(Duration::from_secs(1)).await;  // retry
        }
    }

    /*──────────────── mouse stream ──────────────────*/
    async fn stream_loop_mouse(&self, ep: Channel) {
        loop {
            info!("🖱️  dial {}", self.server_addr);
            let mut cli = RelayClient::new(ep.clone());
    
            let outbound = BroadcastStream::new(self.mou_tx.subscribe())
                .filter_map(|r| r.ok());
    
            match cli.stream_mouse(Request::new(outbound)).await {
                Ok(mut resp) => {
                    while let Some(msg) = resp.get_mut().message().await.transpose() {
                        if let Err(e) = msg { warn!("🖱️  server err: {e}"); break; }
                    }
                }
                Err(e) => warn!("🖱️  connect failed: {e}"),
            }
            tokio::time::sleep(Duration::from_secs(1)).await;
        }
    }

    /*──────────────── monitor stream ────────────────*/
    async fn video_loop(
        ep: Channel,
        tx: tokio::sync::mpsc::UnboundedSender<VideoPacket>,
    ) {
        for monitor_id in 0..=1 {
            let ep = ep.clone();
            let tx = tx.clone();
            tokio::spawn(async move {
                loop {
                    let mut cli = RelayClient::new(ep.clone());
                    let req = MonitorRequest { id: monitor_id, max_bitrate: 6_000 };
                    match cli.capture_video(Request::new(req)).await {
                        Ok(mut stream) => {
                            while let Some(pkt) = stream.get_mut().message().await.transpose() {
                                match pkt {
                                    Ok(p)  => { let _ = tx.send(p); }
                                    Err(e) => { error!("video {monitor_id}: {e}"); break; }
                                }
                            }
                        }
                        Err(e) => error!("video {monitor_id}: {e}"),
                    }
                    tokio::time::sleep(Duration::from_secs(1)).await;
                }
            });
        }
    }
}