use clap::{Arg, Command, ArgMatches, ArgAction};
use crate::Path;
use std::{io, process};

pub const PATH: Path = Path::Bin;

pub fn cli() -> Command {
    Command::new("hostname")
        .version(env!("CARGO_PKG_VERSION"))
        .author("The JeanG3nie <jeang3nie@hitchhiker-linux.org>")
        .about("Prints the name of the current host. The super-user can set the host name by supplying an argument.")
        .arg(
            Arg::new("NAME")
                .help("name to set")
        )
        .arg(
            Arg::new("STRIP")
                .help("Removes any domain information from the printed name.")
                .short('s')
                .long("strip")
                .action(ArgAction::SetTrue)
        )
}

pub fn run(matches: &ArgMatches) {
    if let Some(name) = matches.get_one::<String>("NAME") {
        if let Err(e) = hostname::set(name) {
            eprintln!("{e}");
            process::exit(1);
        }
    } else {
        match hostname::get() {
            Ok(hostname) => {
                if matches.get_flag("STRIP") {
                    println!(
                        "{}",
                        match hostname.to_string_lossy().split('.').next() {
                            Some(c) => c,
                            None => {
                                eprintln!("hostname: missing operand");
                                process::exit(1);
                            }
                        }
                    );
                } else {
                    println!("{}", hostname.to_string_lossy());
                }
            }
            Err(e) => {
                eprintln!("{e}");
                process::exit(1);
            }
        }
    }
}