use fs_extra::dir::DirContent;

pub fn get_dir_content_filtered(p: &std::path::Path, ignored: &Vec<String>) -> Result<DirContent, String> {
    let p = p.canonicalize().map_err(|e| e.to_string())?;
    let base_path_len = p.to_str().unwrap().len() + 1;

    let retain_fn = |p: &String| {
        if p.len() < base_path_len { return false; }
        let rel_path = p.split_at(base_path_len).1;
        !ignored.iter().any(|i| rel_path.starts_with(i))
    };

    let mut content = fs_extra::dir::get_dir_content(p).map_err(|e| e.to_string())?;
    content.files.retain(retain_fn);
    content.directories.retain(retain_fn);
    Ok(content)
}

pub fn trim_dir_content(mut content: DirContent, base: &std::path::Path) -> DirContent {
    let base_path_len = base.canonicalize().unwrap().to_str().unwrap().len() + 1;

    let iter_fn = |p: &mut String| {
        if p.len() < base_path_len { return; }
        let _ = p.drain(..base_path_len).collect::<Vec<_>>();
    };

    content.files.iter_mut().for_each(iter_fn);
    content.directories.iter_mut().for_each(iter_fn);
    content
}

pub fn copy_dir(src_dir: &std::path::Path, dst_dir: &std::path::Path, spinner: &indicatif::ProgressBar) -> Result<(), String> {
    let content = src_dir.read_dir().map_err(|e| e.to_string())?;
    for entry in content {
        let entry = entry.map_err(|e| e.to_string())?;
        let new_dst = dst_dir.join(entry.file_name());
        if entry.path().is_file() {
            std::fs::copy(entry.path(), new_dst).map_err(|e| e.to_string())?;
            spinner.tick();
        } else {
            std::fs::create_dir_all(&new_dst).map_err(|e| e.to_string())?;
            spinner.tick();
            copy_dir(&entry.path(), &new_dst, spinner)?;
        }
    }
    Ok(())
}