"""Support for EnOcean sensors."""
import logging

import voluptuous as vol

from homeassistant.components import enocean
from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import (
    CONF_DEVICE_CLASS,
    CONF_ID,
    CONF_NAME,
    DEVICE_CLASS_HUMIDITY,
    DEVICE_CLASS_TEMPERATURE,
    TEMP_CELSIUS,
    POWER_WATT,
)
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)

CONF_MAX_TEMP = "max_temp"
CONF_MIN_TEMP = "min_temp"
CONF_RANGE_FROM = "range_from"
CONF_RANGE_TO = "range_to"

DEFAULT_NAME = "EnOcean sensor"

DEVICE_CLASS_POWER = "powersensor"

SENSOR_TYPES = {
    DEVICE_CLASS_HUMIDITY: {
        "name": "Humidity",
        "unit": "%",
        "icon": "mdi:water-percent",
        "class": DEVICE_CLASS_HUMIDITY,
    },
    DEVICE_CLASS_POWER: {
        "name": "Power",
        "unit": POWER_WATT,
        "icon": "mdi:power-plug",
        "class": DEVICE_CLASS_POWER,
    },
    DEVICE_CLASS_TEMPERATURE: {
        "name": "Temperature",
        "unit": TEMP_CELSIUS,
        "icon": "mdi:thermometer",
        "class": DEVICE_CLASS_TEMPERATURE,
    },
}

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_ID): vol.All(cv.ensure_list, [vol.Coerce(int)]),
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
        vol.Optional(CONF_DEVICE_CLASS, default=DEVICE_CLASS_POWER): cv.string,
        vol.Optional(CONF_MAX_TEMP, default=40): vol.Coerce(int),
        vol.Optional(CONF_MIN_TEMP, default=0): vol.Coerce(int),
        vol.Optional(CONF_RANGE_FROM, default=255): cv.positive_int,
        vol.Optional(CONF_RANGE_TO, default=0): cv.positive_int,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up an EnOcean sensor device."""
    dev_id = config.get(CONF_ID)
    dev_name = config.get(CONF_NAME)
    dev_class = config.get(CONF_DEVICE_CLASS)

    if dev_class == DEVICE_CLASS_TEMPERATURE:
        temp_min = config.get(CONF_MIN_TEMP)
        temp_max = config.get(CONF_MAX_TEMP)
        range_from = config.get(CONF_RANGE_FROM)
        range_to = config.get(CONF_RANGE_TO)
        add_entities(
            [
                EnOceanTemperatureSensor(
                    dev_id, dev_name, temp_min, temp_max, range_from, range_to
                )
            ]
        )

    elif dev_class == DEVICE_CLASS_HUMIDITY:
        add_entities([EnOceanHumiditySensor(dev_id, dev_name)])

    elif dev_class == DEVICE_CLASS_POWER:
        add_entities([EnOceanPowerSensor(dev_id, dev_name)])


class EnOceanSensor(enocean.EnOceanDevice):
    """Representation of an  EnOcean sensor device such as a power meter."""

    def __init__(self, dev_id, dev_name, sensor_type):
        """Initialize the EnOcean sensor device."""
        super().__init__(dev_id, dev_name)
        self._sensor_type = sensor_type
        self._device_class = SENSOR_TYPES[self._sensor_type]["class"]
        self._dev_name = "{} {}".format(
            SENSOR_TYPES[self._sensor_type]["name"], dev_name
        )
        self._unit_of_measurement = SENSOR_TYPES[self._sensor_type]["unit"]
        self._icon = SENSOR_TYPES[self._sensor_type]["icon"]
        self._state = None

    @property
    def name(self):
        """Return the name of the device."""
        return self._dev_name

    @property
    def icon(self):
        """Icon to use in the frontend."""
        return self._icon

    @property
    def device_class(self):
        """Return the device class of the sensor."""
        return self._device_class

    @property
    def state(self):
        """Return the state of the device."""
        return self._state

    @property
    def unit_of_measurement(self):
        """Return the unit of measurement."""
        return self._unit_of_measurement

    def value_changed(self, packet):
        """Update the internal state of the sensor."""


class EnOceanPowerSensor(EnOceanSensor):
    """Representation of an EnOcean power sensor.

    EEPs (EnOcean Equipment Profiles):
    - A5-12-01 (Automated Meter Reading, Electricity)
    """

    def __init__(self, dev_id, dev_name):
        """Initialize the EnOcean power sensor device."""
        super().__init__(dev_id, dev_name, DEVICE_CLASS_POWER)

    def value_changed(self, packet):
        """Update the internal state of the sensor."""
        if packet.rorg != 0xA5:
            return
        packet.parse_eep(0x12, 0x01)
        if packet.parsed["DT"]["raw_value"] == 1:
            # this packet reports the current value
            raw_val = packet.parsed["MR"]["raw_value"]
            divisor = packet.parsed["DIV"]["raw_value"]
            self._state = raw_val / (10 ** divisor)
            self.schedule_update_ha_state()


class EnOceanTemperatureSensor(EnOceanSensor):
    """Representation of an EnOcean temperature sensor device.

    EEPs (EnOcean Equipment Profiles):
    - A5-02-01 to A5-02-1B All 8 Bit Temperature Sensors of A5-02
    - A5-10-01 to A5-10-14 (Room Operating Panels)
    - A5-04-01 (Temp. and Humidity Sensor, Range 0°C to +40°C and 0% to 100%)
    - A5-04-02 (Temp. and Humidity Sensor, Range -20°C to +60°C and 0% to 100%)
    - A5-10-10 (Temp. and Humidity Sensor and Set Point)
    - A5-10-12 (Temp. and Humidity Sensor, Set Point and Occupancy Control)
    - 10 Bit Temp. Sensors are not supported (A5-02-20, A5-02-30)

    For the following EEPs the scales must be set to "0 to 250":
    - A5-04-01
    - A5-04-02
    - A5-10-10 to A5-10-14
    """

    def __init__(self, dev_id, dev_name, scale_min, scale_max, range_from, range_to):
        """Initialize the EnOcean temperature sensor device."""
        super().__init__(dev_id, dev_name, DEVICE_CLASS_TEMPERATURE)
        self._scale_min = scale_min
        self._scale_max = scale_max
        self.range_from = range_from
        self.range_to = range_to

    def value_changed(self, packet):
        """Update the internal state of the sensor."""
        if packet.data[0] != 0xA5:
            return
        temp_scale = self._scale_max - self._scale_min
        temp_range = self.range_to - self.range_from
        raw_val = packet.data[3]
        temperature = temp_scale / temp_range * (raw_val - self.range_from)
        temperature += self._scale_min
        self._state = round(temperature, 1)
        self.schedule_update_ha_state()


class EnOceanHumiditySensor(EnOceanSensor):
    """Representation of an EnOcean humidity sensor device.

    EEPs (EnOcean Equipment Profiles):
    - A5-04-01 (Temp. and Humidity Sensor, Range 0°C to +40°C and 0% to 100%)
    - A5-04-02 (Temp. and Humidity Sensor, Range -20°C to +60°C and 0% to 100%)
    - A5-10-10 to A5-10-14 (Room Operating Panels)
    """

    def __init__(self, dev_id, dev_name):
        """Initialize the EnOcean humidity sensor device."""
        super().__init__(dev_id, dev_name, DEVICE_CLASS_HUMIDITY)

    def value_changed(self, packet):
        """Update the internal state of the sensor."""
        if packet.rorg != 0xA5:
            return
        humidity = packet.data[2] * 100 / 250
        self._state = round(humidity, 1)
        self.schedule_update_ha_state()
