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use std::io;
use std::os::unix::io::AsRawFd;

use super::error;
use super::signal::Sigset;
use super::Int;

#[derive(Debug)]
pub struct SignalFd {
    fd: Int,
}

impl SignalFd {
    pub fn new(mask: &Sigset, flags: Int) -> io::Result<SignalFd> {
        error::convert_ret(unsafe { libc::signalfd(-1, &mask.raw_set(), flags) })
            .map(|fd| SignalFd { fd })
    }

    pub fn read_one(&self) -> io::Result<Siginfo> {
        let mut siginfo: Siginfo = unsafe { std::mem::zeroed() };

        error::convert_neg(
            unsafe {
                libc::read(
                    self.fd,
                    (&mut siginfo as *mut Siginfo) as *mut libc::c_void,
                    std::mem::size_of::<Siginfo>(),
                )
            },
            siginfo,
        )
    }

    pub fn read(&self, siginfos: &mut [Siginfo]) -> io::Result<usize> {
        error::convert_neg_ret(unsafe {
            libc::read(
                self.fd,
                siginfos.as_mut_ptr() as *mut libc::c_void,
                siginfos.len() * std::mem::size_of::<Siginfo>(),
            )
        })
        .map(|n| (n as usize) / std::mem::size_of::<Siginfo>())
    }
}

impl AsRawFd for SignalFd {
    fn as_raw_fd(&self) -> libc::c_int {
        self.fd
    }
}

impl Drop for SignalFd {
    fn drop(&mut self) {
        unsafe {
            libc::close(self.fd);
        }
    }
}

#[derive(Default, Debug, Copy, Clone)]
#[repr(C)]
pub struct Siginfo {
    pub sig: u32,
    pub errno: i32,
    pub code: i32,
    pub pid: u32,
    pub uid: u32,
    pub fd: i32,
    pub tid: u32,
    pub band: u32,
    pub overrun: u32,
    pub trapno: u32,
    pub status: i32,
    pub int: i32,
    pub ptr: u64,
    pub utime: u64,
    pub stime: u64,
    pub addr: u64,
    pub addr_lsb: u16,
    // WARNING: This is dependent on the size of the fields above!
    _padding: [u8; 32],
    _padding2: [u8; 14],
}