"""Support for monitoring the qBittorrent API."""
from __future__ import annotations

import logging

from qbittorrent.client import Client, LoginRequired
from requests.exceptions import RequestException
import voluptuous as vol

from homeassistant.components.sensor import (
    PLATFORM_SCHEMA,
    SensorEntity,
    SensorEntityDescription,
)
from homeassistant.const import (
    CONF_NAME,
    CONF_PASSWORD,
    CONF_URL,
    CONF_USERNAME,
    DATA_RATE_KILOBYTES_PER_SECOND,
    STATE_IDLE,
)
from homeassistant.exceptions import PlatformNotReady
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)

SENSOR_TYPE_CURRENT_STATUS = "current_status"
SENSOR_TYPE_DOWNLOAD_SPEED = "download_speed"
SENSOR_TYPE_UPLOAD_SPEED = "upload_speed"

DEFAULT_NAME = "qBittorrent"

SENSOR_TYPES: tuple[SensorEntityDescription, ...] = (
    SensorEntityDescription(
        key=SENSOR_TYPE_CURRENT_STATUS,
        name="Status",
    ),
    SensorEntityDescription(
        key=SENSOR_TYPE_DOWNLOAD_SPEED,
        name="Down Speed",
        native_unit_of_measurement=DATA_RATE_KILOBYTES_PER_SECOND,
    ),
    SensorEntityDescription(
        key=SENSOR_TYPE_UPLOAD_SPEED,
        name="Up Speed",
        native_unit_of_measurement=DATA_RATE_KILOBYTES_PER_SECOND,
    ),
)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_URL): cv.url,
        vol.Required(CONF_USERNAME): cv.string,
        vol.Required(CONF_PASSWORD): cv.string,
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the qBittorrent sensors."""

    try:
        client = Client(config[CONF_URL])
        client.login(config[CONF_USERNAME], config[CONF_PASSWORD])
    except LoginRequired:
        _LOGGER.error("Invalid authentication")
        return
    except RequestException as err:
        _LOGGER.error("Connection failed")
        raise PlatformNotReady from err

    name = config.get(CONF_NAME)

    entities = [
        QBittorrentSensor(description, client, name, LoginRequired)
        for description in SENSOR_TYPES
    ]

    add_entities(entities, True)


def format_speed(speed):
    """Return a bytes/s measurement as a human readable string."""
    kb_spd = float(speed) / 1024
    return round(kb_spd, 2 if kb_spd < 0.1 else 1)


class QBittorrentSensor(SensorEntity):
    """Representation of an qBittorrent sensor."""

    def __init__(
        self,
        description: SensorEntityDescription,
        qbittorrent_client,
        client_name,
        exception,
    ):
        """Initialize the qBittorrent sensor."""
        self.entity_description = description
        self.client = qbittorrent_client
        self._exception = exception

        self._attr_name = f"{client_name} {description.name}"
        self._attr_available = False

    def update(self):
        """Get the latest data from qBittorrent and updates the state."""
        try:
            data = self.client.sync_main_data()
            self._attr_available = True
        except RequestException:
            _LOGGER.error("Connection lost")
            self._attr_available = False
            return
        except self._exception:
            _LOGGER.error("Invalid authentication")
            return

        if data is None:
            return

        download = data["server_state"]["dl_info_speed"]
        upload = data["server_state"]["up_info_speed"]

        sensor_type = self.entity_description.key
        if sensor_type == SENSOR_TYPE_CURRENT_STATUS:
            if upload > 0 and download > 0:
                self._attr_native_value = "up_down"
            elif upload > 0 and download == 0:
                self._attr_native_value = "seeding"
            elif upload == 0 and download > 0:
                self._attr_native_value = "downloading"
            else:
                self._attr_native_value = STATE_IDLE

        elif sensor_type == SENSOR_TYPE_DOWNLOAD_SPEED:
            self._attr_native_value = format_speed(download)
        elif sensor_type == SENSOR_TYPE_UPLOAD_SPEED:
            self._attr_native_value = format_speed(upload)