use std::net::TcpListener;
use std::net::TcpStream;
use std::thread::spawn;

use std::io::prelude::*;

// mod cache;

// pub mod state;
// use state::State;

fn main() {
    let server = TcpListener::bind("127.0.0.1:15432").unwrap();
    for client in server.incoming() {
        println!("New conn...");
        let client = client.unwrap();
        spawn(move || {
            handle_connection(client);
        });
    }
}

fn handle_connection(mut client: TcpStream) {
    let mut upstream = TcpStream::connect("127.0.0.1:5432").unwrap();
    upstream.set_nodelay(true).unwrap();

    let mut client_clone = client.try_clone().unwrap();
    let mut upstream_clone = upstream.try_clone().unwrap();

    let t1 = spawn(move || {
        pipe(&mut client, &mut upstream, true);
    });
    let t2 = spawn(move || {
        pipe(&mut upstream_clone, &mut client_clone, false)
    });

    t1.join().unwrap();
    t2.join().unwrap();
}

fn pipe(input: &mut TcpStream, output: &mut TcpStream, is_forth: bool) {
    let mut buffer = [0u8; 32_768];

    let mut reader = BufReader::new(input);
    let mut writer = BufWriter::new(output);

    loop {
        match reader.read(&mut buffer) {
            Ok(size) => {
                if size == 0 {
                    writer.into_inner().unwrap().shutdown(std::net::Shutdown::Both).unwrap();
                    break;
                }

                /*
                let mut size = size;
                if is_forth {
                    size = cache::processor_forth(size, &mut buffer);
                }
                */

                if writer.write(&buffer[..size]).is_ok() {
                    writer.flush().unwrap();
                }
            },
            Err(error) => { println!("Error: {:?}", error); }
        }
    }
}