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use {io, poll, Evented, Ready, Poll, PollOpt, Token};
use std::io::{Read, Write};
use std::mem;
use std::os::unix::io::{IntoRawFd, AsRawFd, FromRawFd, RawFd};
use nix::fcntl::FcntlArg::F_SETFL;
use nix::fcntl::{fcntl, O_NONBLOCK};

pub fn set_nonblock(s: &AsRawFd) -> io::Result<()> {
    fcntl(s.as_raw_fd(), F_SETFL(O_NONBLOCK)).map_err(super::from_nix_error)
                                             .map(|_| ())
}


/*
 *
 * ===== Basic IO type =====
 *
 */

#[derive(Debug)]
pub struct Io {
    fd: RawFd,
}

impl FromRawFd for Io {
    unsafe fn from_raw_fd(fd: RawFd) -> Io {
        Io { fd: fd }
    }
}

impl IntoRawFd for Io {
    fn into_raw_fd(self) -> RawFd {
        // Forget self to prevent drop() from closing self.fd.
        let fd = self.fd;
        mem::forget(self);
        fd
    }
}

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

impl Evented for Io {
    fn register(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
        poll::selector(poll).register(self.fd, token, interest, opts)
    }

    fn reregister(&self, poll: &Poll, token: Token, interest: Ready, opts: PollOpt) -> io::Result<()> {
        poll::selector(poll).reregister(self.fd, token, interest, opts)
    }

    fn deregister(&self, poll: &Poll) -> io::Result<()> {
        poll::selector(poll).deregister(self.fd)
    }
}

impl Read for Io {
    fn read(&mut self, dst: &mut [u8]) -> io::Result<usize> {
        <&Io as Read>::read(&mut &*self, dst)
    }
}

impl<'a> Read for &'a Io {
    fn read(&mut self, dst: &mut [u8]) -> io::Result<usize> {
        use nix::unistd::read;

        read(self.as_raw_fd(), dst)
            .map_err(super::from_nix_error)
    }
}

impl Write for Io {
    fn write(&mut self, src: &[u8]) -> io::Result<usize> {
        <&Io as Write>::write(&mut &*self, src)
    }

    fn flush(&mut self) -> io::Result<()> {
        Ok(())
    }
}

impl<'a> Write for &'a Io {
    fn write(&mut self, src: &[u8]) -> io::Result<usize> {
        use nix::unistd::write;

        write(self.as_raw_fd(), src)
            .map_err(super::from_nix_error)
    }

    fn flush(&mut self) -> io::Result<()> {
        Ok(())
    }
}

impl Drop for Io {
    fn drop(&mut self) {
        use nix::unistd::close;
        let _ = close(self.as_raw_fd());
    }
}