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use std::process::Command;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

pub fn get() -> Option<IpAddr> {
    let output = Command::new("hostname")
        .args(&["-I"])
        .output()
        .expect("failed to execute `hostname`");

    let stdout = String::from_utf8(output.stdout).unwrap();
    let trimmed = stdout.trim();
    if !stdout.is_empty(){
        if let Ok(addr) = trimmed.parse::<Ipv4Addr>() {
            return Some(IpAddr::V4(addr))
        }
        else if let Ok(addr) = trimmed.parse::<Ipv6Addr>() {
            return Some(IpAddr::V6(addr))
        }
        else{
            None
        }
    }else{
        None
    }

}

#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn it_works() {
        let res = get();
        println!("res: {:?}", res);
        assert!(res.is_some());
    }
}