extern crate termion;
extern crate serde_json;

use std::thread::sleep;
use std::time::Duration;
use std::net::TcpStream;
use self::termion::async_stdin;
use std::io::{BufRead, BufReader};
use std::io::{Read, Write, stdout};
use self::termion::raw::IntoRawMode;

pub fn client_engines(mut stream : TcpStream, mut buff_r : BufReader<TcpStream>) {
    let stdout = stdout();
    let mut stdout = stdout.lock().into_raw_mode().unwrap();
    let mut stdin = async_stdin().bytes();

    loop {
        let mut recv = String::new();
        buff_r.read_line(&mut recv).unwrap();
        let has_target = serde_json::from_str(&recv.replace("\n", "")).unwrap();

        write!(stdout, "{}{}use numpad to freely move\n", termion::clear::All, termion::cursor::Goto(1, 1)).unwrap();
        write!(stdout, "{}+ : speedup", termion::cursor::Goto(1, 2)).unwrap();
        write!(stdout, "{}- : slowdown", termion::cursor::Goto(1, 3)).unwrap();
        write!(stdout, "{}s : stop", termion::cursor::Goto(1, 4)).unwrap();
        write!(stdout, "{}q : quit", termion::cursor::Goto(1, 5)).unwrap();

        if has_target {
            write!(stdout, "{}c : mimic targets velocity vector", termion::cursor::Goto(1, 6)).unwrap();
            write!(stdout, "{}t : accelerate torwards target", termion::cursor::Goto(1, 7)).unwrap();
        }

        if let Some(c) = stdin.next() {
            let c = c.unwrap();
            let mut send = String::new();
            send.push(c as char);
            if send.as_bytes() == b"q" {
                break;
            }
            send.push_str("\n");
            stream.write(send.as_bytes()).unwrap();
        }

        stdout.flush().unwrap();
        sleep(Duration::from_millis(100));
    }
}