use std::net::{TcpStream, TcpListener};
use std::io::prelude::*;
// use std::fs;
// use std::thread;
// use std::time::Duration;
// use std::str;
use std::path::Path;

use webserv::{ThreadPool, Response, Route};

extern crate regex;
use regex::Regex;

fn main() {
    let listener = TcpListener::bind("127.0.0.1:26382").unwrap();
    let pool = ThreadPool::new(4);

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

    println!("Shutting down.");
}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 512];
    stream.read(&mut buffer).unwrap();
    let mut r = Response::new("","");
    let bf = &String::from_utf8_lossy(&buffer[..]);
    // let get = b"GET / HTTP/1.1\r\n";
    // let sleep = b"GET /sleep HTTP/1.1\r\n";



    if buffer.starts_with(b"GET") {
        let hdr = Regex::new(r"GET /([^ ]*) HTTP/1.1").unwrap();
    
        let caps = hdr.captures(&bf);
        match caps {
            Some(cap) => {
                let c = cap.get(1).unwrap().as_str();
                route(&c, &mut r);
            },
            None => {
                println!("This wasn't even a well-formed header");
                r.set_header("HTTP/1.1 404 NOT FOUND\r\n\r\n");
                r.add_file_contents("404.html");
            }
        }
    
        
    } else {
        println!("It didn't start with GET!");
        r.set_header("HTTP/1.1 404 NOT FOUND\r\n\r\n");
        r.add_file_contents("404.html");
    }
    // println!("Sending {}: {}", r.header, r.path);
    
    let response = format!("{}{}", r.get_header(), r.get_content());

    stream.write(response.as_bytes()).unwrap();
    stream.flush().unwrap();



    // println!("Request: {}", String::from_utf8_lossy(&buffer[..]));
}

fn route(c: &str, mut r: &mut Response) {

    let mut routes = vec![];
    routes.push(Route::new("v1/hi", api_hi));
    routes.push(Route::new("v1/bye", api_bye));

    // println!("Asked to fetch {}", c);
    //assert!(Path::new(c).exists());
    if c == "" {
        println!("Asked to send root!");
        r.set_header("HTTP/1.1 200 OK\r\n\r\n");
        r.add_file_contents("index.html");
    } else if c.starts_with("api/") {
        let apipath = c.replace("api/","");
        let apipath = apipath.as_str();
        let mut iter_routes = routes.into_iter();
        let valid_route = iter_routes.find(|x| x.get_path() == apipath);
        match valid_route {
            Some(rt) => {
                (rt.get_action())(&apipath, &mut r);
            },
            None => {
                api_none(&c, &mut r);
            }
        }
    } else if Path::new(c).exists() {
        route_basic(&c, &mut r);
    } else {
        println!("Asked to send {} and I could not find it", &c);
        r.set_header("HTTP/1.1 404 NOT FOUND\r\n\r\n");
        r.add_file_contents("404.html");
    }

}

fn route_basic(c: &&str, r: &mut Response) {
    if Path::new(c).is_dir() {
        let mut cs = c.to_string();
        if cs.chars().last().unwrap().to_string() != "/" {
            cs.push_str("/");
        }
        cs.push_str("index.html");
        if Path::new(&cs).exists() {
            println!("Asked to send {}", &cs);
            r.set_header("HTTP/1.1 200 OK\r\n\r\n");
            r.add_file_contents(&cs);
        } else {
            println!("Asked to send {} and I couldn't find it", &cs);
            r.set_header("HTTP/1.1 404 NOT FOUND\r\n\r\n");
            r.add_file_contents("404.html");
        }                            
    } else {
        println!("Asked to send {}", &c);
        r.set_header("HTTP/1.1 200 OK\r\n\r\n");
        r.add_file_contents(&c);    
    }
}

fn api_none(_c: &&str, r: &mut Response) {
    r.set_header("HTTP/1.1 404 NOT FOUND\r\n\r\n");
    r.set_content("There is currently no API endpoint at that address.");
}

fn api_hi(_c: &&str, r: &mut Response) {
    r.set_header("HTTP/1.1 200 OK\r\n\r\n");
    r.set_content("Hello there!");
}

fn api_bye(_c: &&str, r: &mut Response) {
    r.set_header("HTTP/1.1 200 OK\r\n\r\n");
    r.set_content("Leaving so soon?");
}