# SPDX-License-Identifier: BSD-3-Clause
# Copyright (c) 2020, The Monero Project.
# Copyright (c) 2020, dsc@xmr.pm

import re
from typing import Union
from collections import Counter
from functools import partial

import aiohttp

import settings
from wowlet_backend.utils import httpget, popularity_contest
from wowlet_backend.tasks import WowletTask


class BlockheightTask(WowletTask):
    """
    Fetch latest blockheight using webcrawling. We pick the most popular
    height from a list of websites. Arguably this approach has benefits
    over querying a (local) Monero RPC instance, as that requires
    maintenance, while this solution assumes that (at least) 2 websites
    reports the correct height.
    """
    def __init__(self, interval: int = 60):
        super(BlockheightTask, self).__init__(interval)

        self._cache_key = "blockheights"
        self._cache_expiry = 90

        self._websocket_cmd = "blockheights"

    async def task(self) -> Union[dict, None]:
        from wowlet_backend.factory import app
        timeout = aiohttp.ClientTimeout(total=3)

        async with aiohttp.ClientSession(timeout=timeout) as session:
            async with session.get(f'http://{settings.RPC_WOWNERO_HOST}:{settings.RPC_WOWNERO_PORT}/get_height') as resp:
                blob = await resp.json()

                return {
                    'mainnet': blob['height']
                }