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"""IPEchoAPI - returns real IP address of the host (behind NAT)"""
import asyncio
import functools
import logging
import urllib
from typing import Optional

from async_lru import alru_cache

from defence360agent.api.server import API, APIError
from defence360agent.utils.validate import IP, IPVersion

logger = logging.getLogger(__name__)

TIMEOUT_FOR_IPECHO_REQUEST = 5  # in seconds


class IPEchoAPI(API):
    """Make requests to the API for obtain own IP address"""

    URL = "/api/ip"

    @classmethod
    @alru_cache(maxsize=3)
    async def get_ip(cls, ip_version: IPVersion = None) -> Optional[str]:
        """Return cached result for resolved IP from echo ip API"""

        return await cls.ip_for_version(ip_version)

    @classmethod
    @functools.lru_cache(maxsize=1)
    def server_ip(cls):
        """Return cached result for resolved IP from echo ip API"""
        try:
            return cls._get_ip()
        except Exception as e:
            raise APIError from e

    @classmethod
    async def ip_for_version(
        cls, ip_version: IPVersion = None
    ) -> Optional[str]:
        """Return resolved IP from echo ip API"""

        loop = asyncio.get_event_loop()
        try:
            ip = await asyncio.wait_for(
                loop.run_in_executor(None, cls._get_ip),
                timeout=TIMEOUT_FOR_IPECHO_REQUEST,
            )
            if IP.type_of(ip) != ip_version:
                raise ValueError("Wrong ip type")
            return ip
        except (asyncio.TimeoutError, ValueError) as e:
            raise APIError from e

    @classmethod
    def _get_ip(cls):
        """Send request to API and process response"""
        request = urllib.request.Request(cls._BASE_URL + cls.URL)
        response = cls.request(request)
        if response.get("status") != "ok":
            # time inside sync executor
            raise APIError("Unexpected API error")
        return response.get("ip")