use rayon::prelude::*;
use std::fs;
use std::io;
use std::path::Path;
use std::os::unix;

pub fn hardcopy(source: &Path, destination: &Path) -> io::Result<()> {
    let metadata = fs::symlink_metadata(source)?;

    if metadata.file_type().is_file() {
        fs::hard_link(source, destination)?;
    } else if metadata.file_type().is_dir() {
        fs::create_dir_all(destination)?;

        let entries: Vec<_> = fs::read_dir(source)?.collect::<io::Result<Vec<_>>>()?;
        entries.par_iter().try_for_each(|entry| {
            let path = entry.path();
            if let Some(file_name) = path.file_name() {
                let dest_path = destination.join(file_name);
                hardcopy(&path, &dest_path)
            } else {
                Ok(())
            }
        })?;
    } else if metadata.file_type().is_symlink() {
        let target = fs::read_link(source)?;
        unix::fs::symlink(target, destination)?;
    }

    Ok(())
}