use std::rc::Rc;

use super::error::{ProjectError, TooManySupers};
use crate::interner::{Interner, Tok};
use crate::representations::sourcefile::absolute_path;
use crate::utils::Substack;

pub fn import_abs_path(
  src_path: &[Tok<String>],
  mod_stack: Substack<Tok<String>>,
  import_path: &[Tok<String>],
  i: &Interner,
) -> Result<Vec<Tok<String>>, Rc<dyn ProjectError>> {
  // path of module within file
  let mod_pathv = mod_stack.iter().rev_vec_clone();
  // path of module within compilation
  let abs_pathv = src_path
    .iter()
    .copied()
    .chain(mod_pathv.iter().copied())
    .collect::<Vec<_>>();
  // preload-target path relative to module
  // preload-target path within compilation
  absolute_path(&abs_pathv, import_path, i).map_err(|_| {
    TooManySupers {
      path: import_path.iter().map(|t| i.r(*t)).cloned().collect(),
      offender_file: src_path.iter().map(|t| i.r(*t)).cloned().collect(),
      offender_mod: mod_pathv.iter().map(|t| i.r(*t)).cloned().collect(),
    }
    .rc()
  })
}