use std::os::unix::io::RawFd;

use anyhow::{bail, format_err, Error};

use proxmox::tools::fd::Fd;

pub mod daemon;
pub mod formatter;

mod environment;
pub use environment::*;

mod state;
pub use state::*;

mod command_socket;
pub use command_socket::*;

mod file_logger;
pub use file_logger::{FileLogger, FileLogOptions};

mod api_config;
pub use api_config::ApiConfig;

pub enum AuthError {
    Generic(Error),
    NoData,
}

impl From<Error> for AuthError {
    fn from(err: Error) -> Self {
        AuthError::Generic(err)
    }
}

pub trait ApiAuth {
    fn check_auth(
        &self,
        headers: &http::HeaderMap,
        method: &hyper::Method,
    ) -> Result<String, AuthError>;
}

static mut SHUTDOWN_REQUESTED: bool = false;

pub fn request_shutdown() {
    unsafe {
        SHUTDOWN_REQUESTED = true;
    }
    crate::server_shutdown();
}

#[inline(always)]
pub fn shutdown_requested() -> bool {
    unsafe { SHUTDOWN_REQUESTED }
}

pub fn fail_on_shutdown() -> Result<(), Error> {
    if shutdown_requested() {
        bail!("Server shutdown requested - aborting task");
    }
    Ok(())
}

/// Helper to set/clear the FD_CLOEXEC flag on file descriptors
pub fn fd_change_cloexec(fd: RawFd, on: bool) -> Result<(), Error> {
    use nix::fcntl::{fcntl, FdFlag, F_GETFD, F_SETFD};
    let mut flags = FdFlag::from_bits(fcntl(fd, F_GETFD)?)
        .ok_or_else(|| format_err!("unhandled file flags"))?; // nix crate is stupid this way...
    flags.set(FdFlag::FD_CLOEXEC, on);
    fcntl(fd, F_SETFD(flags))?;
    Ok(())
}

/// safe wrapper for `nix::sys::socket::socketpair` defaulting to `O_CLOEXEC` and guarding the file
/// descriptors.
pub fn socketpair() -> Result<(Fd, Fd), Error> {
    use nix::sys::socket;
    let (pa, pb) = socket::socketpair(
        socket::AddressFamily::Unix,
        socket::SockType::Stream,
        None,
        socket::SockFlag::SOCK_CLOEXEC,
    )?;
    Ok((Fd(pa), Fd(pb)))
}