use super::Cmd;
use clap::{Arg, ArgAction, Command};
use std::path::Path;

#[derive(Debug)]
pub struct Dirname {
    name: &'static str,
    path: Option<crate::Path>,
}

pub const DIRNAME: Dirname = Dirname {
    name: "dirname",
    path: Some(crate::Path::UsrBin),
};

impl Cmd for Dirname {
    fn name(&self) -> &str {
        self.name
    }

    fn cli(&self) -> clap::Command {
        Command::new("dirname")
            .about("strip last component from file name")
            .args([
                Arg::new("zero")
                    .short('z')
                    .long("zero")
                    .help("end each output line with NUL, not newline")
                    .action(ArgAction::SetTrue),
                Arg::new("name").num_args(1..).required(true),
            ])
    }

    fn run(&self, matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
        if let Some(matches) = matches {
            if let Some(names) = matches.get_many::<String>("name") {
                names.for_each(|name| {
                    let path = match Path::new(name).parent() {
                        Some(p) => p,
                        None => Path::new("."),
                    };
                    let path = path.to_string_lossy();
                    let path = if path.is_empty() {
                        String::from(".")
                    } else {
                        path.to_string()
                    };
                    if matches.get_flag("zero") {
                        print!("{}\0", path);
                    } else {
                        println!("{}", path);
                    }
                });
            }
        }
        Ok(())
    }

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