use super::Cmd;
use clap::{Arg, ArgAction, Command};
use std::{fs, io};

#[derive(Debug, Default)]
pub struct Link;

impl Cmd for Link {
    fn name(&self) -> &str {
        "link"
    }

    fn cli(&self) -> clap::Command {
        Command::new("link")
            .about("call the link function to create a link to a file")
            .author("Nathan Fisher")
            .version(env!("CARGO_PKG_VERSION"))
            .args([
                Arg::new("file1").required(true).index(1),
                Arg::new("file2").required(true).index(2),
                Arg::new("verbose")
                    .short('v')
                    .long("verbose")
                    .action(ArgAction::SetTrue),
            ])
    }

    fn run(&self, matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
        let Some(matches) = matches else {
            return Err(Box::new(io::Error::new(io::ErrorKind::Other, "no input")));
        };
        let f1 = match matches.get_one::<String>("file1") {
            Some(s) => s,
            None => {
                return Err(Box::new(io::Error::new(
                    io::ErrorKind::Other,
                    "missing file 1",
                )))
            }
        };
        let f2 = match matches.get_one::<String>("file2") {
            Some(s) => s,
            None => {
                return Err(Box::new(io::Error::new(
                    io::ErrorKind::Other,
                    "missing file 2",
                )))
            }
        };
        fs::hard_link(f1, f2)?;
        if matches.get_flag("verbose") {
            println!("{f2} -> {f1}");
        }
        Ok(())
    }

    fn path(&self) -> Option<crate::Path> {
        Some(crate::Path::UsrBin)
    }
}