from phasmplatform.common.router import BaseRouter


class BaseRunner:
    __slots__ = ('router', )

    router: BaseRouter

    def __init__(self, router: BaseRouter) -> None:
        self.router = router

    def alloc_bytes(self, data: bytes) -> int:
        """
        Calls upon stdlib.types.__alloc_bytes__ to allocate a bytes object
        """
        raise NotImplementedError

    def read_bytes(self, ptr: int) -> bytes:
        """
        Reads a byte object allocated by stdlib.types.__alloc_bytes__
        """
        raise NotImplementedError

    def handle_message(self, namespace: bytes, topic: bytes, kind: bytes, body: bytes) -> None:
        raise NotImplementedError

    def post_message(self, namespace_ptr: int, topic_ptr: int, kind_ptr: int, body_ptr: int) -> None:
        namespace = self.read_bytes(namespace_ptr)
        topic = self.read_bytes(topic_ptr)
        kind = self.read_bytes(kind_ptr)
        body = self.read_bytes(body_ptr)

        self.router.post_message(namespace, topic, kind, body)