""" interface with whatever connectors the app has """
import asyncio
import importlib
import ipaddress
import logging
from urllib.parse import urlparse

import aiohttp
from django.dispatch import receiver
from django.db.models import signals

from requests import HTTPError

from bookwyrm import book_search, models
from bookwyrm.settings import SEARCH_TIMEOUT, USER_AGENT
from bookwyrm.tasks import app

logger = logging.getLogger(__name__)


class ConnectorException(HTTPError):
    """when the connector can't do what was asked"""


async def async_connector_search(query, items, params):
    """Try a number of requests simultaneously"""
    timeout = aiohttp.ClientTimeout(total=SEARCH_TIMEOUT)
    # pylint: disable=line-too-long
    headers = {
        "Accept": (
            'application/json, application/activity+json, application/ld+json; profile="https://www.w3.org/ns/activitystreams"; charset=utf-8'
        ),
        "User-Agent": USER_AGENT,
    }
    async with aiohttp.ClientSession(timeout=timeout) as session:
        for url, connector in items:
            url = connector.get_search_url(query)
            # raise_not_valid_url(url)

            async with session.get(url, headers=headers, params=params) as response:
                print("Status:", response.status)
                print(response.ok)
                print("Content-type:", response.headers["content-type"])

                raw_response = await response.json()
                return {
                    "connector": connector,
                    "results": connector.process_search_response(query, raw_response),
                }


def search(query, min_confidence=0.1, return_first=False):
    """find books based on arbitary keywords"""
    if not query:
        return []
    results = []

    items = []
    for connector in get_connectors():
        # get the search url from the connector before sending
        url = connector.get_search_url(query)
        # check the URL is valid
        raise_not_valid_url(url)
        items.append((url, connector))

    # load as many results as we can
    params = {"min_confidence": min_confidence}
    results = asyncio.run(async_connector_search(query, items, params))
    raise Exception("Hi")

    if return_first:
        # find the best result from all the responses and return that
        raise Exception("Not implemented yet")

    return results


def first_search_result(query, min_confidence=0.1):
    """search until you find a result that fits"""
    # try local search first
    result = book_search.search(query, min_confidence=min_confidence, return_first=True)
    if result:
        return result
    # otherwise, try remote endpoints
    return search(query, min_confidence=min_confidence, return_first=True) or None


def get_connectors():
    """load all connectors"""
    for info in models.Connector.objects.filter(active=True).order_by("priority").all():
        yield load_connector(info)


def get_or_create_connector(remote_id):
    """get the connector related to the object's server"""
    url = urlparse(remote_id)
    identifier = url.netloc
    if not identifier:
        raise ValueError("Invalid remote id")

    try:
        connector_info = models.Connector.objects.get(identifier=identifier)
    except models.Connector.DoesNotExist:
        connector_info = models.Connector.objects.create(
            identifier=identifier,
            connector_file="bookwyrm_connector",
            base_url=f"https://{identifier}",
            books_url=f"https://{identifier}/book",
            covers_url=f"https://{identifier}/images/covers",
            search_url=f"https://{identifier}/search?q=",
            priority=2,
        )

    return load_connector(connector_info)


@app.task(queue="low_priority")
def load_more_data(connector_id, book_id):
    """background the work of getting all 10,000 editions of LoTR"""
    connector_info = models.Connector.objects.get(id=connector_id)
    connector = load_connector(connector_info)
    book = models.Book.objects.select_subclasses().get(id=book_id)
    connector.expand_book_data(book)


def load_connector(connector_info):
    """instantiate the connector class"""
    connector = importlib.import_module(
        f"bookwyrm.connectors.{connector_info.connector_file}"
    )
    return connector.Connector(connector_info.identifier)


@receiver(signals.post_save, sender="bookwyrm.FederatedServer")
# pylint: disable=unused-argument
def create_connector(sender, instance, created, *args, **kwargs):
    """create a connector to an external bookwyrm server"""
    if instance.application_type == "bookwyrm":
        get_or_create_connector(f"https://{instance.server_name}")


def raise_not_valid_url(url):
    """do some basic reality checks on the url"""
    parsed = urlparse(url)
    if not parsed.scheme in ["http", "https"]:
        raise ConnectorException("Invalid scheme: ", url)

    try:
        ipaddress.ip_address(parsed.netloc)
        raise ConnectorException("Provided url is an IP address: ", url)
    except ValueError:
        # it's not an IP address, which is good
        pass

    if models.FederatedServer.is_blocked(url):
        raise ConnectorException(f"Attempting to load data from blocked url: {url}")