use std::{
    fs,
    io::{ prelude::*, BufReader },
    net::{ TcpListener, TcpStream },
    thread,
    time::Duration,
};

use hello::ThreadPool;

fn main() {
    // this is not related I was just curious
    // let test = fs::read_to_string("test.yaml").unwrap();
    // println!("{}", test);

    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();

    let pool = ThreadPool::new(4);

    for stream in listener.incoming().take(2) {
        let stream = stream.unwrap();
        pool.execute(|| {
            handle_connection(stream);
        });
    }

    println!("Shutting down.");
}

fn handle_connection(mut stream: TcpStream) {
    let buf_reader = BufReader::new(&stream);

    // let http_request: Vec<_> = buf_reader
    //     .lines()
    //     .map(|result| result.unwrap())
    //     .take_while(|line| !line.is_empty())
    //     .collect();
    let request_line = buf_reader.lines().next().unwrap().unwrap();
    // no longer needed, here for debug and being useful
    // println!("Request: {:#?}", http_request);
    // if request_line == "GET / HTTP/1.1" {
    //     let status_line = "HTTP/1.1 200 OK";
    //     let contents = fs::read_to_string("./hello.html").unwrap();
    //     let length = contents.len();

    //     let res = format!("{status_line}\r\nContent-Length: {length}\r\n\r\n{contents}");

    //     stream.write_all(res.as_bytes()).unwrap();
    // } else {
    //     let status_line = "HTTP/1.1 404 NOT FOUND";
    //     let contents = fs::read_to_string("404.html").unwrap();
    //     let length = contents.len();

    //     let res = format!("{status_line}\r\nContent-Length: {length}\r\n\r\n{contents}");

    //     stream.write_all(res.as_bytes()).unwrap();
    // }

    let (status_line, filename) = match &request_line[..] {
        "GET / HTTP/1.1" => ("HTTP/1.1 200 OK", "hello.html"),
        "GET /sleep HTTP/1.1" => {
            thread::sleep(Duration::from_secs(5));
            ("HTTP/1.1 200 OK", "hello.html")
        }
        _ => ("HTTP/1.1 404 NOT FOUND", "404.html"),
    };

    let contents = fs::read_to_string(filename).unwrap();
    let length = contents.len();

    let res = format!("{status_line}\r\nContent-Length: {length}\r\n\r\n{contents}");

    stream.write_all(res.as_bytes()).unwrap();
}