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import abc

from typing import Generic, TypeVar
from .. import PipelineRequest, PipelineResponse

AsyncHTTPResponseType = TypeVar("AsyncHTTPResponseType")
HTTPResponseType = TypeVar("HTTPResponseType")
HTTPRequestType = TypeVar("HTTPRequestType")


class AsyncHTTPPolicy(abc.ABC, Generic[HTTPRequestType, AsyncHTTPResponseType]):
    """An async HTTP policy ABC.

    Use with an asynchronous pipeline.
    """

    next: "AsyncHTTPPolicy[HTTPRequestType, AsyncHTTPResponseType]"
    """Pointer to the next policy or a transport (wrapped as a policy). Will be set at pipeline creation."""

    @abc.abstractmethod
    async def send(
        self, request: PipelineRequest[HTTPRequestType]
    ) -> PipelineResponse[HTTPRequestType, AsyncHTTPResponseType]:
        """Abstract send method for a asynchronous pipeline. Mutates the request.

        Context content is dependent on the HttpTransport.

        :param request: The pipeline request object.
        :type request: ~azure.core.pipeline.PipelineRequest
        :return: The pipeline response object.
        :rtype: ~azure.core.pipeline.PipelineResponse
        """