from .base import CoreAdapter
from typing import Optional


def get_adapter(config: dict) -> Optional[CoreAdapter]:
    """Factory: return the configured core adapter, or None for export-only mode."""
    core_cfg = config.get("core", {})
    core_type = core_cfg.get("type", "none")
    uri = core_cfg.get("mongodb_uri", "mongodb://localhost:27017")
    db_name = core_cfg.get("database_name", "open5gs")
    apn = config.get("profile", {}).get("apn", "internet")

    if core_type == "open5gs":
        from .open5gs import Open5GSAdapter
        return Open5GSAdapter(uri, db_name, apn)
    elif core_type == "free5gc":
        from .free5gc import Free5GCAdapter
        return Free5GCAdapter(uri, db_name, apn)
    else:
        return None