use std::error::Error;
use std::io;
use std::sync::mpsc::Receiver;

use log::{error, info};

use quicktap::drivers::tun::TunDevice;
use quicktap::drivers::tungeneric::GenericDriver;

use crate::command::PacketThreadCommand;

pub fn packet_thread(mut device: TunDevice, rx: Receiver<PacketThreadCommand>) -> Result<(), Box<dyn Error>> {
    loop {
        // Check command channel
        let command = match rx.try_recv() {
            Ok(d) => Some(d),
            Err(e) if matches!(e, std::sync::mpsc::TryRecvError::Empty) => None,
            Err(e) => return Err(e.into())
        };
        if let Some(cmd) = command {
            if let PacketThreadCommand::Stop = cmd {
                info!("packet thread: recieved command to stop by control process");
                return Ok(())
            }
        }

        let packet = match device.read() {
            Ok(p) => Some(p),
            Err(e) => match e.kind() {
                io::ErrorKind::WouldBlock => None,
                _ => {
                    error!("Error while reading packets from interface: {}", e);
                    return Err(e.into());
                }
            }
        };

        if let Some(p) = packet {
            info!("recv_packet_on_tun {:?}", p.header);
        }
    }
}