from pathlib import Path

from django.conf import settings

_freebase_ent2name = None


def _get_freebase_ent2name():
    global _freebase_ent2name
    if _freebase_ent2name is None:
        path = Path(settings.COINS_DATA_DIR) / "FB15k-237" / "ent2name.txt"
        mapping = {}
        if path.exists():
            with open(path, encoding="utf-8") as f:
                for line in f:
                    parts = line.rstrip("\n").split(None, 1)
                    if len(parts) == 2:
                        mapping[parts[0]] = parts[1].replace("_", " ")
        _freebase_ent2name = mapping
    return _freebase_ent2name


def clean_entity_name(name: str, dataset_id: str) -> str:
    """Apply dataset-specific entity name cleaning for display."""
    if dataset_id == "freebase":
        resolved = _get_freebase_ent2name().get(name)
        if resolved:
            return resolved
        return name.replace("/m/", "")
    elif dataset_id == "wordnet":
        return name.split(".")[0]
    else:  # nell
        if "concept" not in name:
            return name
        return name.split(":")[-1 if "new" not in name else -2]


def clean_relation_name(name: str, dataset_id: str) -> str:
    """Apply dataset-specific relation name cleaning for display."""
    if dataset_id == "freebase":
        return ".".join(
            "_".join(hop.split("/")[-2:]) for hop in name.split(".")
        )
    elif dataset_id == "wordnet":
        return name[1:] if name.startswith("_") else name
    else:  # nell
        if "concept" not in name:
            return name
        return name.split(":")[-1 if "new" not in name else -2]