import time
from http import HTTPStatus
from urllib.parse import urlencode

import aiohttp
import yaml

config = yaml.safe_load(open("../config.yaml", "r", encoding="utf-8"))


async def create_chart(
    from_currency: str, conv_currency: str, period: str, backend: str
) -> (str, None):
    params = {
        "from_currency": from_currency,
        "conv_currency": conv_currency,
        "period": period,
        "backend": backend,
        "time_unique": time.time(),
    }

    # Without time_unqiue Telegram does not want to load the image
    # Probably because of some kind of caching, but it's disabled.

    base_url = f'{config["kekkai_instance"]}/api/getChart/'
    query_string = urlencode(params)
    full_url = f"{base_url}?{query_string}"

    async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=3)) as session:
        async with session.get(full_url) as res:
            if not HTTPStatus(res.status).is_success:
                return None

            return full_url