use anyhow::Result;
use craftio_rs::{CraftAsyncReader, CraftAsyncWriter, CraftTokioConnection};
use mcproto_rs::protocol::HasPacketKind;
use mcproto_rs::v1_19_3::{Packet761, Packet761Kind, RawPacket761};
use tokio::io::BufReader;
use tokio::net::TcpStream;

#[macro_export]
macro_rules! await_packet {
    ($packet_type:ident, $conn:expr) => {
        assert_packet!(
            $packet_type,
            $conn.wait_for_packet(Packet761Kind::$packet_type).await?
        )
    };
}

#[macro_export]
macro_rules! assert_packet {
    ($packet_type:ident, $obj:expr) => {
        if let Packet761::$packet_type(packet_data) = $obj {
            packet_data
        } else {
            panic!("Expected packet of type {}", stringify!($packet_type))
        }
    };
    ($packet_type:ident, $conn:expr, $errmgs:literal) => {
        assert_packet!(
            $packet_type,
            $conn
                .read_next_packet()
                .await?
                .ok_or(anyhow::anyhow!("Missing packet"))?
        )
    };
}

pub struct MinecraftClient {
    pub connection: CraftTokioConnection,
}

impl MinecraftClient {
    pub fn from_stream(stream: TcpStream) -> Self {
        let (read, write) = stream.into_split();
        let bufread = BufReader::new(read);
        MinecraftClient {
            connection: CraftTokioConnection::from_async((bufread, write), mcproto_rs::protocol::PacketDirection::ServerBound),
        }
    }
    pub async fn read_next_packet(&mut self) -> Result<Option<Packet761>> {
        if let Some(raw) = self.connection.read_packet_async::<RawPacket761>().await? {
            println!("Client -> Server: {:?}", raw);
            Ok(Some(raw))
        } else {
            Ok(None)
        }
    }
    pub async fn send_packet(&mut self, packet: Packet761) -> Result<()> {
        println!("Server -> Client: {:?}", packet);
        self.connection.write_packet_async(packet).await?;
        Ok(())
    }
    pub async fn wait_for_packet(&mut self, packet_kind: Packet761Kind) -> Result<Packet761> {
        loop {
            if let Some(packet) = self.read_next_packet().await? {
                if packet.kind() == packet_kind {
                    return Ok(packet);
                }
                println!("Skipping packet {:?}", packet);
            }
        }
    }
}