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

pub struct Server {
    bind: String,
}

impl Server {
    pub fn new(bind: String) -> Server {
        Server { bind }
    }

    pub fn start(&self) {
        let listener = TcpListener::bind(self.bind.clone()).unwrap();
        for next_stream in listener.incoming() {
            self.handle(next_stream.unwrap());
        }
    }

    pub fn handle(&self, 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();
    }
}

fn main() {
    let server = Server::new("127.0.0.1:7878".to_string());
    server.start()
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_starts_a_server() {
        assert!(true);
    }
}