import time  # TODO remove
import typing

import homeassistant.const
import homeassistant.core
import homeassistant.helpers.entity


class MCP3008Channel(homeassistant.helpers.entity.Entity):
    def __init__(self, channel_index: int) -> None:
        self._channel_index = channel_index
        self._state: typing.Optional[float] = None

    # https://developers.home-assistant.io/docs/core/entity/#generic-properties

    @property
    def name(self) -> str:
        return f"MCP3008 Channel #{self._channel_index}"

    @property
    def unique_id(self) -> str:
        return f"mcp3008-ch{self._channel_index}"

    # https://developers.home-assistant.io/docs/core/entity/sensor/#properties

    @property
    def state(self) -> typing.Optional[float]:
        return self._state

    @property
    def device_class(self) -> str:
        return "voltage"

    @property
    def unit_of_measurement(self) -> str:
        return homeassistant.const.VOLT

    def update(self) -> None:
        self._state = (time.time() / 60) % 60  # TODO


def setup_platform(
    hass: homeassistant.core.HomeAssistant,
    config: dict,
    add_entities: typing.Callable,
    discovery_info=None,
):
    add_entities([MCP3008Channel(channel_index=0)])