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// Take a look at the license at the top of the repository in the LICENSE file.

#[cfg(any(unix, all(docsrs, unix)))]
use std::os::unix::io::IntoRawFd;

#[cfg(any(unix, docsrs))]
#[cfg(any(unix, docsrs))]
use glib::translate::*;

use crate::SubprocessLauncher;

#[cfg(all(docsrs, not(unix)))]
pub trait IntoRawFd: Sized {
    fn into_raw_fd(self) -> i32 {
        0
    }
}

impl SubprocessLauncher {
    /// Transfer an arbitrary file descriptor from parent process to the
    /// child. This function takes ownership of the `source_fd`; it will be closed
    /// in the parent when `self` is freed.
    ///
    /// By default, all file descriptors from the parent will be closed.
    /// This function allows you to create (for example) a custom ``pipe()`` or
    /// ``socketpair()`` before launching the process, and choose the target
    /// descriptor in the child.
    ///
    /// An example use case is GNUPG, which has a command line argument
    /// `--passphrase-fd` providing a file descriptor number where it expects
    /// the passphrase to be written.
    /// ## `source_fd`
    /// File descriptor in parent process
    /// ## `target_fd`
    /// Target descriptor for child process
    #[cfg(any(unix, docsrs))]
    #[cfg_attr(docsrs, doc(cfg(unix)))]
    #[doc(alias = "g_subprocess_launcher_take_fd")]
    pub fn take_fd(&self, source_fd: impl IntoRawFd, target_fd: impl IntoRawFd) {
        unsafe {
            ffi::g_subprocess_launcher_take_fd(
                self.to_glib_none().0,
                source_fd.into_raw_fd(),
                target_fd.into_raw_fd(),
            );
        }
    }

    /// Sets the file descriptor to use as the stderr for spawned processes.
    ///
    /// If `fd` is -1 then any previously given fd is unset.
    ///
    /// Note that the default behaviour is to pass stderr through to the
    /// stderr of the parent process.
    ///
    /// The passed `fd` belongs to the [`SubprocessLauncher`][crate::SubprocessLauncher]. It will be
    /// automatically closed when the launcher is finalized. The file
    /// descriptor will also be closed on the child side when executing the
    /// spawned process.
    ///
    /// You may not set a stderr fd if a stderr file path is already set or
    /// if the launcher flags contain any flags directing stderr elsewhere.
    ///
    /// This feature is only available on UNIX.
    /// ## `fd`
    /// a file descriptor, or -1
    #[cfg(any(unix, docsrs))]
    #[cfg_attr(docsrs, doc(cfg(unix)))]
    #[doc(alias = "g_subprocess_launcher_take_stderr_fd")]
    pub fn take_stderr_fd(&self, fd: impl IntoRawFd) {
        unsafe {
            ffi::g_subprocess_launcher_take_stderr_fd(self.to_glib_none().0, fd.into_raw_fd());
        }
    }

    /// Sets the file descriptor to use as the stdin for spawned processes.
    ///
    /// If `fd` is -1 then any previously given fd is unset.
    ///
    /// Note that if your intention is to have the stdin of the calling
    /// process inherited by the child then [`SubprocessFlags::STDIN_INHERIT`][crate::SubprocessFlags::STDIN_INHERIT]
    /// is a better way to go about doing that.
    ///
    /// The passed `fd` is noted but will not be touched in the current
    /// process. It is therefore necessary that it be kept open by the
    /// caller until the subprocess is spawned. The file descriptor will
    /// also not be explicitly closed on the child side, so it must be marked
    /// O_CLOEXEC if that's what you want.
    ///
    /// You may not set a stdin fd if a stdin file path is already set or if
    /// the launcher flags contain any flags directing stdin elsewhere.
    ///
    /// This feature is only available on UNIX.
    /// ## `fd`
    /// a file descriptor, or -1
    #[cfg(any(unix, docsrs))]
    #[cfg_attr(docsrs, doc(cfg(unix)))]
    #[doc(alias = "g_subprocess_launcher_take_stdin_fd")]
    pub fn take_stdin_fd(&self, fd: impl IntoRawFd) {
        unsafe {
            ffi::g_subprocess_launcher_take_stdin_fd(self.to_glib_none().0, fd.into_raw_fd());
        }
    }

    /// Sets the file descriptor to use as the stdout for spawned processes.
    ///
    /// If `fd` is -1 then any previously given fd is unset.
    ///
    /// Note that the default behaviour is to pass stdout through to the
    /// stdout of the parent process.
    ///
    /// The passed `fd` is noted but will not be touched in the current
    /// process. It is therefore necessary that it be kept open by the
    /// caller until the subprocess is spawned. The file descriptor will
    /// also not be explicitly closed on the child side, so it must be marked
    /// O_CLOEXEC if that's what you want.
    ///
    /// You may not set a stdout fd if a stdout file path is already set or
    /// if the launcher flags contain any flags directing stdout elsewhere.
    ///
    /// This feature is only available on UNIX.
    /// ## `fd`
    /// a file descriptor, or -1
    #[cfg(any(unix, docsrs))]
    #[cfg_attr(docsrs, doc(cfg(unix)))]
    #[doc(alias = "g_subprocess_launcher_take_stdout_fd")]
    pub fn take_stdout_fd(&self, fd: impl IntoRawFd) {
        unsafe {
            ffi::g_subprocess_launcher_take_stdout_fd(self.to_glib_none().0, fd.into_raw_fd());
        }
    }
}