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use std::io;
use std::process::Child;

fn kill_process(process: &mut Child) -> Result<(), io::Error> {
    if let Ok(()) = process.kill() {
        process.wait()?;
    } else {
        println!("Process {} has already exited", process.id());
    }
    Ok(())
}

#[cfg(windows)]
pub fn stop_process(process: &mut Child) -> Result<(), io::Error> {
    kill_process(process)
}

#[cfg(not(windows))]
pub fn stop_process(process: &mut Child) -> Result<(), io::Error> {
    use nix::errno::Errno::{EINVAL, EPERM, ESRCH};
    use nix::sys::signal::{kill, Signal};
    use nix::unistd::Pid;
    use nix::Error::Sys;
    use std::io::ErrorKind;
    use std::thread;
    use std::time::{Duration, Instant};

    let nice_wait = Duration::from_secs(5);
    let pid = Pid::from_raw(process.id() as i32);
    match kill(pid, Signal::SIGINT) {
        Ok(()) => {
            let expire = Instant::now() + nice_wait;
            while let Ok(None) = process.try_wait() {
                if Instant::now() > expire {
                    break;
                }
                thread::sleep(nice_wait / 10);
            }
            if let Ok(None) = process.try_wait() {
                kill_process(process)?;
            }
        }
        Err(Sys(EINVAL)) => {
            println!("Invalid signal. Killing process {}", pid);
            kill_process(process)?;
        }
        Err(Sys(EPERM)) => {
            return Err(io::Error::new(
                ErrorKind::InvalidInput,
                format!("Insufficient permissions to signal process {}", pid),
            ));
        }
        Err(Sys(ESRCH)) => {
            return Err(io::Error::new(
                ErrorKind::InvalidInput,
                format!("Process {} does not exist", pid),
            ));
        }
        Err(e) => {
            return Err(io::Error::new(
                ErrorKind::InvalidInput,
                format!("Unexpected error {}", e),
            ));
        }
    };
    Ok(())
}