#[cfg(windows)]
pub mod windows;

use nix::{sys::signal, unistd::Pid};

/// Force kill process.
///
/// Results in undefined behavior if PID is invalid.
#[allow(unreachable_code)]
pub fn force_kill(pid: u32) -> bool {
    #[cfg(unix)]
    return unix_signal(pid, signal::SIGKILL);

    #[cfg(windows)]
    unsafe {
        return windows::force_kill(pid);
    }

    unimplemented!("force killing Minecraft server process not implemented on this platform");
}

/// Gracefully kill process.
/// Results in undefined behavior if PID is invalid.
///
/// # Panics
/// Panics on platforms other than Unix.
#[allow(unreachable_code, dead_code, unused_variables)]
pub fn kill_gracefully(pid: u32) -> bool {
    #[cfg(unix)]
    return unix_signal(pid, signal::SIGTERM);

    unimplemented!(
        "gracefully killing Minecraft server process not implemented on non-Unix platforms"
    );
}

/// Freeze process.
/// Results in undefined behavior if PID is invaild.
///
/// # Panics
/// Panics on platforms other than Unix.
#[allow(unreachable_code)]
pub fn freeze(pid: u32) -> bool {
    #[cfg(unix)]
    return unix_signal(pid, signal::SIGSTOP);

    unimplemented!(
        "freezing the Minecraft server process is not implemented on non-Unix platforms"
    );
}

/// Unfreeze process.
/// Results in undefined behavior if PID is invaild.
///
/// # Panics
/// Panics on platforms other than Unix.
#[allow(unreachable_code)]
pub fn unfreeze(pid: u32) -> bool {
    #[cfg(unix)]
    return unix_signal(pid, signal::SIGCONT);

    unimplemented!(
        "unfreezing the Minecraft server process is not implemented on non-Unix platforms"
    );
}

#[cfg(unix)]
pub fn unix_signal(pid: u32, signal: signal::Signal) -> bool {
    return match signal::kill(Pid::from_raw(pid as i32), signal) {
        Ok(()) => true,
        Err(err) => {
            warn!(target: "lazymc", "Sending {signal} signal to server failed: {err}");
            false
        }
    };
}