use std::{
  env, fs,
  path::{Path, PathBuf},
};

const COPY_DIR: &'static str = "res";

/// A helper function for recursively copying a directory.
fn copy_dir<P, Q>(from: P, to: Q)
where
  P: AsRef<Path>,
  Q: AsRef<Path>,
{
  let to = to.as_ref().to_path_buf();

  for path in fs::read_dir(from).unwrap() {
      let path = path.unwrap().path();
      let to = to.clone().join(path.file_name().unwrap());

      if path.is_file() {
          fs::copy(&path, to).unwrap();
      } else if path.is_dir() {
          if !to.exists() {
              fs::create_dir(&to).unwrap();
          }

          copy_dir(&path, to);
      } else { /* Skip other content */
      }
  }
}

fn main() {
  // Request the output directory
  let out = env::var("PROFILE").unwrap();
  let out = PathBuf::from(format!("target/{}/{}", out, COPY_DIR));

  // If it is already in the output directory, delete it and start over
  if out.exists() {
      fs::remove_dir_all(&out).unwrap();
  }

  // Create the out directory
  fs::create_dir(&out).unwrap();

  // Copy the directory
  copy_dir(COPY_DIR, &out);
}