from __future__ import annotations

import re


_WS_RE = re.compile(r"\s+")
_FEAT_RE = re.compile(r"\s*[\(\[\-–—]\s*(feat|ft)\.?.*$", re.IGNORECASE)


def normalize_track_signature(name: str, artists: list[str]) -> str:
    clean_name = _FEAT_RE.sub("", name).strip().lower()
    clean_name = _WS_RE.sub(" ", clean_name)
    clean_artists = ",".join(sorted(a.strip().lower() for a in artists if a.strip()))
    return f"{clean_name}::{clean_artists}"