#!/usr/bin/env python3

import logging
import urllib.request
from typing import Optional

logger = logging.getLogger()


class ThermometerRegistry(object):
    def __init__(self):
        self.thermometers = {
            'house_outside': ('10.0.0.75', 'outside_temp'),
            'house_inside_downstairs': ('10.0.0.75', 'inside_downstairs_temp'),
            'house_inside_upstairs': ('10.0.0.75', 'inside_upstairs_temp'),
            'house_computer_closet': ('10.0.0.75', 'computer_closet_temp'),
            'house_crawlspace': ('10.0.0.75', 'crawlspace_temp'),
            'cabin_outside': ('192.168.0.107', 'outside_temp'),
            'cabin_inside': ('192.168.0.107', 'inside_temp'),
            'cabin_crawlspace': ('192.168.0.107', 'crawlspace_temp'),
            'cabin_hottub': ('192.168.0.107', 'hottub_temp'),
        }

    def read_temperature(self, location: str, *, convert_to_fahrenheit=False) -> Optional[float]:
        record = self.thermometers.get(location, None)
        if record is None:
            logger.error(
                f'Location {location} is not known.  Valid locations are {self.thermometers.keys()}.'
            )
            return None
        url = f'http://{record[0]}/~pi/{record[1]}'
        logger.debug(f'Constructed URL: {url}')
        try:
            www = urllib.request.urlopen(url, timeout=3)
            temp = www.read().decode('utf-8')
            temp = float(temp)
            if convert_to_fahrenheit:
                temp *= 9 / 5
                temp += 32.0
                temp = round(temp)
        except Exception as e:
            logger.exception(e)
            logger.error(f'Failed to read temperature at URL: {url}')
            temp = None
        finally:
            if www is not None:
                www.close()
        return temp