"""File storage provider — singleton factory."""

from app.core.config import get_settings
from app.infrastructure.storage.local import LocalFileStorage

_storage: LocalFileStorage | None = None


def get_file_storage() -> LocalFileStorage:
    global _storage
    if _storage is None:
        settings = get_settings()
        if settings.storage_backend == "s3":
            raise NotImplementedError("S3 storage not yet implemented.")
        _storage = LocalFileStorage(settings.media_path)
    return _storage