import importlib


def _load(kind: str, name: str, config, *args):
    if not name or not name.replace("_", "").replace("-", "").isalnum():
        raise RuntimeError(f"Invalid {kind} plugin name: {name!r}")

    module_name = name.replace("-", "_")
    path = f"dns_sync.plugins.{kind}.{module_name}"

    try:
        module = importlib.import_module(path)
    except ModuleNotFoundError as exc:
        if exc.name == path:
            raise RuntimeError(f"Unknown {kind[:-1]} plugin: {name}") from exc
        raise

    plugin_class = getattr(module, "Plugin", None)
    if plugin_class is None:
        raise RuntimeError(f"Plugin module {path} does not export Plugin")

    return plugin_class(config, *args)


def load_source(name: str, config):
    return _load("sources", name, config)


def load_provider(name: str, config):
    return _load("providers", name, config)


def load_adapter(name: str, config, endpoint):
    return _load("adapters", name, config, endpoint)