from typing import Dict, List, Optional

from aws_lambda_powertools.utilities.data_classes.common import BaseProxyEvent, DictWrapper


class ALBEventRequestContext(DictWrapper):
    @property
    def elb_target_group_arn(self) -> str:
        return self["requestContext"]["elb"]["targetGroupArn"]


class ALBEvent(BaseProxyEvent):
    """Application load balancer event

    Documentation:
    --------------
    - https://docs.aws.amazon.com/lambda/latest/dg/services-alb.html
    """

    @property
    def request_context(self) -> ALBEventRequestContext:
        return ALBEventRequestContext(self._data)

    @property
    def http_method(self) -> str:
        return self["httpMethod"]

    @property
    def path(self) -> str:
        return self["path"]

    @property
    def multi_value_query_string_parameters(self) -> Optional[Dict[str, List[str]]]:
        return self.get("multiValueQueryStringParameters")

    @property
    def multi_value_headers(self) -> Optional[Dict[str, List[str]]]:
        return self.get("multiValueHeaders")
