use std::fs;
use std::io::BufReader;
use std::io::prelude::*;
use std::net::TcpListener;
use std::net::TcpStream;

fn main() {
    start_server("127.0.0.1:7878".to_string())
}

pub fn start_server(bind: String) {
    let listener = TcpListener::bind(bind).unwrap();
    for next_stream in listener.incoming() {
        handle(next_stream.unwrap());
    }
}

fn handle(mut stream: TcpStream) {
    let io = BufReader::new(&stream);
    let request_line = io.lines().next().unwrap().unwrap();

    let (status_line, filename) = match &request_line[..] {
        "GET / HTTP/1.1" => ("HTTP/1.1 200 OK", "./public/index.html"),
        "GET /.well-known/oauth-authorization-server HTTP/1.1" => {
            ("HTTP/1.1 200 OK", "./public/metadata.json")
        }
        _ => ("HTTP/1.1 404 NOT FOUND", "./public/404.html"),
    };

    let contents = fs::read_to_string(filename).unwrap();
    let length = contents.len();
    let response = format!("{status_line}\r\nContent-Length: {length}\r\n\r\n{contents}");

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

#[cfg(test)]
mod tests {
    use crate::start_server;
    use std::thread;

    #[test]
    fn it_starts_a_server() {
        // TODO:: figure out how to spawn a server in a background thread
        // let server = thread::spawn(|| start_server("127.0.0.1:7878".to_string()));
        assert!(true);
        // server.join().unwrap();
    }
}