use std::sync::Arc;
use tokio::{net::TcpStream, io::{AsyncWriteExt, AsyncReadExt}};
use crate::{http::{header::Header, response::Response, request::Request}, script::Config};

async fn send_response(mut socket: TcpStream, code: u16, body: String) {
    let mut res = Response::new();
    res.headers.put(Header::new("Content-Type", "text/plain"));
    res.status = code;
    res.body = Some(body);

    let res_str = res.deserialize();
    
    let _ = socket.write(res_str.as_bytes()).await;
}

pub async fn handle_connection(mut socket: TcpStream, config: Arc<Config>) {
    
    let mut buf = [0; 1204];

    let n: usize = match socket.read(&mut buf).await {
        Ok(n) if n == 0 => return,
        Ok(n) => n as usize,
        Err(e) => {
            eprintln!("failed to read from socket; err = {:?}", e);
            return
        }
    };
    
    let str = String::from_utf8_lossy(&buf[0..n]);

    let Some(req) = Request::serialize(&str) else {
        return
    };


    let Some(script) = config.get(&req.method, &req.uri.route) else {
        send_response(socket, 405, "Method Not Allowed".to_owned()).await;
        return
    };

    match script.run(req.body.as_ref()) {
        Ok(res) => { 
            let res_str = res.deserialize();
            let _ = socket.write(res_str.as_bytes()).await;
        },
        Err(err) => {
            println!("{err}");
            send_response(socket, 500, format!("{err}")).await;
        },
    }
}