"""Storage backend factory."""

from __future__ import annotations

from marketing_intelligence.storage.backend import StorageBackend

_backend: StorageBackend | None = None


def get_backend() -> StorageBackend:
    global _backend
    if _backend is None:
        from marketing_intelligence.core.config import settings

        if settings.storage_backend == "s3":
            from marketing_intelligence.storage.s3 import S3Backend

            _backend = S3Backend()
        else:
            from marketing_intelligence.storage.local import LocalBackend

            _backend = LocalBackend()
    return _backend