use std::io::{Read, Write};
use std::net::{TcpListener, TcpStream};
use std::time::Duration;
use std::{fs, thread};

use lib::ThreadPool;

pub mod lib;

fn main() {
    let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
    let pool = ThreadPool::new(4);
    for stream in listener.incoming() {
        let stream = stream.unwrap();
        //使用线程池处理请求（thread::spawn）
        pool.execute(|| {
            handle_connection(stream);
        });
    }
}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 512];
    stream.read(&mut buffer).unwrap();
    let get = b"GET / HTTP/1.1\r\n";
    let sleep = b"GET /sleep HTTP/1.1\r\n";
    let (status_line, filename) = if buffer.starts_with(get) {
        ("HTTP/1.1 200 OK\r\n\r\n", "hello.html")
    } else if buffer.starts_with(sleep) {
        thread::sleep(Duration::from_secs(5));
        ("HTTP/1.1 200 OK\r\n\r\n", "hello.html")
    } else {
        ("HTTP/1.1 404 NOT FOUND\r\n\r\n", "404.html")
    };

    let contents = fs::read_to_string(filename).unwrap();
    let response = format!("{}{}", status_line, contents);
    stream.write(response.as_bytes()).unwrap();
    stream.flush().unwrap();
}
