use std::{io, error::Error, fs, path::Path};
use super::Cmd;
use clap::{Arg, ArgAction, Command, ValueHint};

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

impl Cmd for Rmdir {
    fn cli(&self) -> clap::Command {
        Command::new("rmdir")
            .about("remove directories")
            .author("Nathan Fisher")
            .version(env!("CARGO_PKG_VERSION"))
            .args([
                Arg::new("parents")
                    .help("remove DIRECTORY and it's ancestors")
                    .short('p')
                    .long("parents")
                    .action(ArgAction::SetTrue),
                Arg::new("dir")
                    .num_args(1..)
                    .value_name("DIRECTORY")
                    .value_hint(ValueHint::DirPath)
                    .required(true),
                Arg::new("verbose")
                    .help("output a diagnostic for every directory processed")
                    .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")));
        };
        if let Some(directories) = matches.get_many::<String>("dir") {
            for dir in directories {
                if matches.get_flag("parents") {
                    let path = Path::new(dir);
                    rmdir_recursive(path, matches.get_flag("verbose"))?;
                } else {
                    fs::remove_dir(dir)?;
                    if matches.get_flag("verbose") {
                        println!("rmdir: removing directory, '{dir}'");
                    }
                }
            }
        }
        Ok(())
    }

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

fn rmdir_recursive(dir: &Path, verbose: bool) -> Result<(), Box<dyn Error>> {
    fs::remove_dir(dir)?;
    if verbose {
        println!("rmdir: removing directory, '{}'", dir.display());
    }
    if let Some(parent) = dir.parent() {
        if let Some(name) = parent.to_str() {
            if !name.is_empty() {
                rmdir_recursive(parent, verbose)?;
            }
        }
    }
    Ok(())
}