//! Http server
use std::{time, io};
use std::net::Shutdown;

use actix;
use futures::Poll;
use tokio_io::{AsyncRead, AsyncWrite};
use tokio_core::net::TcpStream;

mod srv;
mod worker;
mod channel;
pub(crate) mod encoding;
pub(crate) mod h1;
mod h2;
mod h1writer;
mod h2writer;
mod settings;
pub(crate) mod helpers;
pub(crate) mod shared;
pub(crate) mod utils;

pub use self::srv::HttpServer;
pub use self::settings::ServerSettings;

use body::Binary;
use error::Error;
use header::ContentEncoding;
use httprequest::{HttpInnerMessage, HttpRequest};
use httpresponse::HttpResponse;

/// max buffer size 64k
pub(crate) const MAX_WRITE_BUFFER_SIZE: usize = 65_536;

/// Create new http server with application factory.
///
/// This is shortcut for `server::HttpServer::new()` method.
///
/// ```rust
/// # extern crate actix;
/// # extern crate actix_web;
/// use actix::*;
/// use actix_web::{server, App, HttpResponse};
///
/// fn main() {
///     let sys = actix::System::new("guide");
///
///     server::new(
///         || App::new()
///             .resource("/", |r| r.f(|_| HttpResponse::Ok())))
///         .bind("127.0.0.1:59090").unwrap()
///         .start();
///
///     #     actix::Arbiter::system().do_send(actix::msgs::SystemExit(0));
///     let _ = sys.run();
/// }
/// ```
pub fn new<F, U, H>(factory: F) -> HttpServer<H>
    where F: Fn() -> U + Sync + Send + 'static,
          U: IntoIterator<Item=H> + 'static,
          H: IntoHttpHandler + 'static
{
    HttpServer::new(factory)
}

#[derive(Debug, PartialEq, Clone, Copy)]
/// Server keep-alive setting
pub enum KeepAlive {
    /// Keep alive in seconds
    Timeout(usize),
    /// Use `SO_KEEPALIVE` socket option, value in seconds
    Tcp(usize),
    /// Relay on OS to shutdown tcp connection
    Os,
    /// Disabled
    Disabled,
}

impl From<usize> for KeepAlive {
    fn from(keepalive: usize) -> Self {
        KeepAlive::Timeout(keepalive)
    }
}

impl From<Option<usize>> for KeepAlive {
    fn from(keepalive: Option<usize>) -> Self {
        if let Some(keepalive) = keepalive {
            KeepAlive::Timeout(keepalive)
        } else {
            KeepAlive::Disabled
        }
    }
}

/// Pause accepting incoming connections
///
/// If socket contains some pending connection, they might be dropped.
/// All opened connection remains active.
#[derive(Message)]
pub struct PauseServer;

/// Resume accepting incoming connections
#[derive(Message)]
pub struct ResumeServer;

/// Stop incoming connection processing, stop all workers and exit.
///
/// If server starts with `spawn()` method, then spawned thread get terminated.
pub struct StopServer {
    pub graceful: bool
}

impl actix::Message for StopServer {
    type Result = Result<(), ()>;
}

/// Low level http request handler
#[allow(unused_variables)]
pub trait HttpHandler: 'static {

    /// Handle request
    fn handle(&mut self, req: HttpRequest) -> Result<Box<HttpHandlerTask>, HttpRequest>;
}

impl HttpHandler for Box<HttpHandler> {
    fn handle(&mut self, req: HttpRequest) -> Result<Box<HttpHandlerTask>, HttpRequest> {
        self.as_mut().handle(req)
    }
}

#[doc(hidden)]
pub trait HttpHandlerTask {

    /// Poll task, this method is used before or after *io* object is available
    fn poll(&mut self) -> Poll<(), Error>;

    /// Poll task when *io* object is available
    fn poll_io(&mut self, io: &mut Writer) -> Poll<bool, Error>;

    /// Connection is disconnected
    fn disconnected(&mut self);
}

/// Conversion helper trait
pub trait IntoHttpHandler {
    /// The associated type which is result of conversion.
    type Handler: HttpHandler;

    /// Convert into `HttpHandler` object.
    fn into_handler(self, settings: ServerSettings) -> Self::Handler;
}

impl<T: HttpHandler> IntoHttpHandler for T {
    type Handler = T;

    fn into_handler(self, _: ServerSettings) -> Self::Handler {
        self
    }
}

#[doc(hidden)]
#[derive(Debug)]
pub enum WriterState {
    Done,
    Pause,
}

#[doc(hidden)]
/// Stream writer
pub trait Writer {
    fn written(&self) -> u64;

    fn start(&mut self, req: &mut HttpInnerMessage, resp: &mut HttpResponse, encoding: ContentEncoding)
             -> io::Result<WriterState>;

    fn write(&mut self, payload: Binary) -> io::Result<WriterState>;

    fn write_eof(&mut self) -> io::Result<WriterState>;

    fn poll_completed(&mut self, shutdown: bool) -> Poll<(), io::Error>;
}

#[doc(hidden)]
/// Low-level io stream operations
pub trait IoStream: AsyncRead + AsyncWrite + 'static {
    fn shutdown(&mut self, how: Shutdown) -> io::Result<()>;

    fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()>;

    fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()>;
}

impl IoStream for TcpStream {
    #[inline]
    fn shutdown(&mut self, how: Shutdown) -> io::Result<()> {
        TcpStream::shutdown(self, how)
    }

    #[inline]
    fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
        TcpStream::set_nodelay(self, nodelay)
    }

    #[inline]
    fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
        TcpStream::set_linger(self, dur)
    }
}

#[cfg(feature="alpn")]
use tokio_openssl::SslStream;

#[cfg(feature="alpn")]
impl IoStream for SslStream<TcpStream> {
    #[inline]
    fn shutdown(&mut self, _how: Shutdown) -> io::Result<()> {
        let _ = self.get_mut().shutdown();
        Ok(())
    }

    #[inline]
    fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
        self.get_mut().get_mut().set_nodelay(nodelay)
    }

    #[inline]
    fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
        self.get_mut().get_mut().set_linger(dur)
    }
}

#[cfg(feature="tls")]
use tokio_tls::TlsStream;

#[cfg(feature="tls")]
impl IoStream for TlsStream<TcpStream> {
    #[inline]
    fn shutdown(&mut self, _how: Shutdown) -> io::Result<()> {
        let _ = self.get_mut().shutdown();
        Ok(())
    }

    #[inline]
    fn set_nodelay(&mut self, nodelay: bool) -> io::Result<()> {
        self.get_mut().get_mut().set_nodelay(nodelay)
    }

    #[inline]
    fn set_linger(&mut self, dur: Option<time::Duration>) -> io::Result<()> {
        self.get_mut().get_mut().set_linger(dur)
    }
}