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use prelude::{Protocol, IoControl, GetSocketOption, SetSocketOption};
use ffi::{RawFd, AsRawFd, ioctl, getsockopt, setsockopt,
          getsockname, getpeername, socket, bind, shutdown};
use core::{IoContext, AsIoContext, Socket, AsyncFd};
use async::{Handler};
use reactive_io::{AsAsyncFd, cancel, connect, async_connect, getnonblock, setnonblock,
                  send, async_send, recv, async_recv, write, async_write, read, async_read};
use socket_base::{Shutdown, BytesReadable};
use streams::Stream;

use std::io;
use std::fmt;

/// Provides a stream-oriented socket.
pub struct StreamSocket<P> {
    pro: P,
    fd: AsyncFd,
}

impl<P: Protocol> StreamSocket<P> {
    pub fn new(ctx: &IoContext, pro: P) -> io::Result<StreamSocket<P>> {
        let fd = try!(socket(&pro));
        Ok(unsafe { Self::from_raw_fd(ctx, pro, fd) })
    }

    pub fn async_connect<F>(&self, ep: &P::Endpoint, handler: F) -> F::Output
        where F: Handler<(), io::Error>,
    {
        async_connect(self, ep, handler)
    }

    pub fn async_receive<F>(&self, buf: &mut [u8], flags: i32, handler: F) -> F::Output
        where F: Handler<usize, io::Error>,
    {
        async_recv(self, buf, flags, handler)
    }

    pub fn async_send<F>(&self, buf: &[u8], flags: i32, handler: F) -> F::Output
        where F: Handler<usize, io::Error>,
    {
        async_send(self, buf, flags, handler)
    }

    pub fn available(&self) -> io::Result<usize> {
        let mut bytes = BytesReadable::default();
        try!(self.io_control(&mut bytes));
        Ok(bytes.get())
    }

    pub fn bind(&self, ep: &P::Endpoint) -> io::Result<()> {
        bind(self, ep)
    }

    pub fn cancel(&self) {
        cancel(self)
    }

    pub fn connect(&self, ep: &P:: Endpoint) -> io::Result<()> {
        connect(self, ep)
    }

    pub fn get_non_blocking(&self) -> io::Result<bool> {
        getnonblock(self)
    }

    pub fn get_option<C>(&self) -> io::Result<C>
        where C: GetSocketOption<P>,
    {
        getsockopt(self, &self.pro)
    }

    pub fn io_control<C>(&self, cmd: &mut C) -> io::Result<()>
        where C: IoControl,
    {
        ioctl(self, cmd)
    }

    pub fn local_endpoint(&self) -> io::Result<P::Endpoint> {
        getsockname(self, &self.pro)
    }

    pub fn receive(&self, buf: &mut [u8], flags: i32) -> io::Result<usize> {
        recv(self, buf, flags)
    }

    pub fn remote_endpoint(&self) -> io::Result<P::Endpoint> {
        getpeername(self, &self.pro)
    }

    pub fn send(&self, buf: &[u8], flags: i32) -> io::Result<usize> {
        send(self, buf, flags)
    }

    pub fn set_non_blocking(&self, on: bool) -> io::Result<()> {
        setnonblock(self, on)
    }

    pub fn set_option<C>(&self, cmd: C) -> io::Result<()>
        where C: SetSocketOption<P>,
    {
        setsockopt(self, &self.pro, cmd)
    }

    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
        shutdown(self, how)
    }
}

impl<P: Protocol> Stream<io::Error> for StreamSocket<P> {
    fn async_read_some<F>(&self, buf: &mut [u8], handler: F) -> F::Output
        where F: Handler<usize, io::Error>,
    {
        async_read(self, buf, handler)
    }

    fn async_write_some<F>(&self, buf: &[u8], handler: F) -> F::Output
        where F: Handler<usize, io::Error>,
    {
        async_write(self, buf, handler)
    }

    fn read_some(&self, buf: &mut [u8]) -> io::Result<usize> {
        read(self, buf)
    }

    fn write_some(&self, buf: &[u8]) -> io::Result<usize> {
        write(self, buf)
    }
}

impl<P: Protocol> fmt::Debug for StreamSocket<P> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "StreamSocket({:?})", self.pro)
    }
}

impl<P> AsRawFd for StreamSocket<P> {
    fn as_raw_fd(&self) -> RawFd {
        self.fd.as_raw_fd()
    }
}

unsafe impl<P> Send for StreamSocket<P> { }

unsafe impl<P> AsIoContext for StreamSocket<P> {
    fn as_ctx(&self) -> &IoContext {
        self.fd.as_ctx()
    }
}

impl<P: Protocol> Socket<P> for StreamSocket<P> {
    unsafe fn from_raw_fd(ctx: &IoContext, pro: P, fd: RawFd) -> StreamSocket<P> {
        StreamSocket {
            pro: pro,
            fd: AsyncFd::new::<Self>(fd, ctx),
        }
    }

    fn protocol(&self) -> P {
        self.pro.clone()
    }
}

impl<P: Protocol> AsAsyncFd for StreamSocket<P> {
    fn as_fd(&self) -> &AsyncFd {
        &self.fd
    }
}