"""RemoteWriter which writes BSON to the given HTTP destination."""

import typing as t

import bson
import requests

from . import logger
from . import types


class HTTPWriter(logger.RemoteWriter):

    def __init__(self, url: str, preamble: t.Dict[str, t.Any]):
        self._url = url
        self._session = requests.Session()
        self._session.headers['User-Agent'] = 'weatherlogger/0.0.1'
        self._preamble = bson.BSON.encode(preamble)

    def write(self, readings: t.Sequence[types.Reading]) -> None:
        try:
            data = b''.join(bson.BSON.encode(r.as_dict()) for r in readings)
            response = self._session.post(self._url, data=self._preamble + data)
            response.raise_for_status()
        except requests.exceptions.RequestException as rex:
            raise logger.RemoteWriteError("Coulndn't write values") from rex