"""Support for sensors through the SmartThings cloud API."""
from collections import namedtuple
from typing import Optional, Sequence

from pysmartthings import Attribute, Capability

from homeassistant.const import (
    DEVICE_CLASS_BATTERY, DEVICE_CLASS_HUMIDITY, DEVICE_CLASS_ILLUMINANCE,
    DEVICE_CLASS_TEMPERATURE, DEVICE_CLASS_TIMESTAMP, ENERGY_KILO_WATT_HOUR,
    MASS_KILOGRAMS, POWER_WATT, TEMP_CELSIUS, TEMP_FAHRENHEIT)

from . import SmartThingsEntity
from .const import DATA_BROKERS, DOMAIN

Map = namedtuple("map", "attribute name default_unit device_class")

CAPABILITY_TO_SENSORS = {
    Capability.activity_lighting_mode: [
        Map(Attribute.lighting_mode, "Activity Lighting Mode", None, None)],
    Capability.air_conditioner_mode: [
        Map(Attribute.air_conditioner_mode, "Air Conditioner Mode", None,
            None)],
    Capability.air_quality_sensor: [
        Map(Attribute.air_quality, "Air Quality", 'CAQI', None)],
    Capability.alarm: [
        Map(Attribute.alarm, "Alarm", None, None)],
    Capability.audio_volume: [
        Map(Attribute.volume, "Volume", "%", None)],
    Capability.battery: [
        Map(Attribute.battery, "Battery", "%", DEVICE_CLASS_BATTERY)],
    Capability.body_mass_index_measurement: [
        Map(Attribute.bmi_measurement, "Body Mass Index", "kg/m^2", None)],
    Capability.body_weight_measurement: [
        Map(Attribute.body_weight_measurement, "Body Weight", MASS_KILOGRAMS,
            None)],
    Capability.carbon_dioxide_measurement: [
        Map(Attribute.carbon_dioxide, "Carbon Dioxide Measurement", "ppm",
            None)],
    Capability.carbon_monoxide_detector: [
        Map(Attribute.carbon_monoxide, "Carbon Monoxide Detector", None,
            None)],
    Capability.carbon_monoxide_measurement: [
        Map(Attribute.carbon_monoxide_level, "Carbon Monoxide Measurement",
            "ppm", None)],
    Capability.dishwasher_operating_state: [
        Map(Attribute.machine_state, "Dishwasher Machine State", None, None),
        Map(Attribute.dishwasher_job_state, "Dishwasher Job State", None,
            None),
        Map(Attribute.completion_time, "Dishwasher Completion Time", None,
            DEVICE_CLASS_TIMESTAMP)],
    Capability.dryer_mode: [
        Map(Attribute.dryer_mode, "Dryer Mode", None, None)],
    Capability.dryer_operating_state: [
        Map(Attribute.machine_state, "Dryer Machine State", None, None),
        Map(Attribute.dryer_job_state, "Dryer Job State", None, None),
        Map(Attribute.completion_time, "Dryer Completion Time", None,
            DEVICE_CLASS_TIMESTAMP)],
    Capability.dust_sensor: [
        Map(Attribute.fine_dust_level, "Fine Dust Level", None, None),
        Map(Attribute.dust_level, "Dust Level", None, None)],
    Capability.energy_meter: [
        Map(Attribute.energy, "Energy Meter", ENERGY_KILO_WATT_HOUR, None)],
    Capability.equivalent_carbon_dioxide_measurement: [
        Map(Attribute.equivalent_carbon_dioxide_measurement,
            'Equivalent Carbon Dioxide Measurement', 'ppm', None)],
    Capability.formaldehyde_measurement: [
        Map(Attribute.formaldehyde_level, 'Formaldehyde Measurement', 'ppm',
            None)],
    Capability.illuminance_measurement: [
        Map(Attribute.illuminance, "Illuminance", 'lux',
            DEVICE_CLASS_ILLUMINANCE)],
    Capability.infrared_level: [
        Map(Attribute.infrared_level, "Infrared Level", '%', None)],
    Capability.media_input_source: [
        Map(Attribute.input_source, "Media Input Source", None, None)],
    Capability.media_playback_repeat: [
        Map(Attribute.playback_repeat_mode, "Media Playback Repeat", None,
            None)],
    Capability.media_playback_shuffle: [
        Map(Attribute.playback_shuffle, "Media Playback Shuffle", None, None)],
    Capability.media_playback: [
        Map(Attribute.playback_status, "Media Playback Status", None, None)],
    Capability.odor_sensor: [
        Map(Attribute.odor_level, "Odor Sensor", None, None)],
    Capability.oven_mode: [
        Map(Attribute.oven_mode, "Oven Mode", None, None)],
    Capability.oven_operating_state: [
        Map(Attribute.machine_state, "Oven Machine State", None, None),
        Map(Attribute.oven_job_state, "Oven Job State", None, None),
        Map(Attribute.completion_time, "Oven Completion Time", None, None)],
    Capability.oven_setpoint: [
        Map(Attribute.oven_setpoint, "Oven Set Point", None, None)],
    Capability.power_meter: [
        Map(Attribute.power, "Power Meter", POWER_WATT, None)],
    Capability.power_source: [
        Map(Attribute.power_source, "Power Source", None, None)],
    Capability.refrigeration_setpoint: [
        Map(Attribute.refrigeration_setpoint, "Refrigeration Setpoint", None,
            DEVICE_CLASS_TEMPERATURE)],
    Capability.relative_humidity_measurement: [
        Map(Attribute.humidity, "Relative Humidity Measurement", '%',
            DEVICE_CLASS_HUMIDITY)],
    Capability.robot_cleaner_cleaning_mode: [
        Map(Attribute.robot_cleaner_cleaning_mode,
            "Robot Cleaner Cleaning Mode", None, None)],
    Capability.robot_cleaner_movement: [
        Map(Attribute.robot_cleaner_movement, "Robot Cleaner Movement", None,
            None)],
    Capability.robot_cleaner_turbo_mode: [
        Map(Attribute.robot_cleaner_turbo_mode, "Robot Cleaner Turbo Mode",
            None, None)],
    Capability.signal_strength: [
        Map(Attribute.lqi, "LQI Signal Strength", None, None),
        Map(Attribute.rssi, "RSSI Signal Strength", None, None)],
    Capability.smoke_detector: [
        Map(Attribute.smoke, "Smoke Detector", None, None)],
    Capability.temperature_measurement: [
        Map(Attribute.temperature, "Temperature Measurement", None,
            DEVICE_CLASS_TEMPERATURE)],
    Capability.thermostat_cooling_setpoint: [
        Map(Attribute.cooling_setpoint, "Thermostat Cooling Setpoint", None,
            DEVICE_CLASS_TEMPERATURE)],
    Capability.thermostat_fan_mode: [
        Map(Attribute.thermostat_fan_mode, "Thermostat Fan Mode", None, None)],
    Capability.thermostat_heating_setpoint: [
        Map(Attribute.heating_setpoint, "Thermostat Heating Setpoint", None,
            DEVICE_CLASS_TEMPERATURE)],
    Capability.thermostat_mode: [
        Map(Attribute.thermostat_mode, "Thermostat Mode", None, None)],
    Capability.thermostat_operating_state: [
        Map(Attribute.thermostat_operating_state, "Thermostat Operating State",
            None, None)],
    Capability.thermostat_setpoint: [
        Map(Attribute.thermostat_setpoint, "Thermostat Setpoint", None,
            DEVICE_CLASS_TEMPERATURE)],
    Capability.three_axis: [],
    Capability.tv_channel: [
        Map(Attribute.tv_channel, "Tv Channel", None, None)],
    Capability.tvoc_measurement: [
        Map(Attribute.tvoc_level, "Tvoc Measurement", 'ppm', None)],
    Capability.ultraviolet_index: [
        Map(Attribute.ultraviolet_index, "Ultraviolet Index", None, None)],
    Capability.voltage_measurement: [
        Map(Attribute.voltage, "Voltage Measurement", 'V', None)],
    Capability.washer_mode: [
        Map(Attribute.washer_mode, "Washer Mode", None, None)],
    Capability.washer_operating_state: [
        Map(Attribute.machine_state, "Washer Machine State", None, None),
        Map(Attribute.washer_job_state, "Washer Job State", None, None),
        Map(Attribute.completion_time, "Washer Completion Time", None,
            DEVICE_CLASS_TIMESTAMP)]
}

UNITS = {
    'C': TEMP_CELSIUS,
    'F': TEMP_FAHRENHEIT
}

THREE_AXIS_NAMES = ['X Coordinate', 'Y Coordinate', 'Z Coordinate']


async def async_setup_platform(
        hass, config, async_add_entities, discovery_info=None):
    """Platform uses config entry setup."""
    pass


async def async_setup_entry(hass, config_entry, async_add_entities):
    """Add binary sensors for a config entry."""
    broker = hass.data[DOMAIN][DATA_BROKERS][config_entry.entry_id]
    sensors = []
    for device in broker.devices.values():
        for capability in broker.get_assigned(device.device_id, 'sensor'):
            if capability == Capability.three_axis:
                sensors.extend(
                    [SmartThingsThreeAxisSensor(device, index)
                     for index in range(len(THREE_AXIS_NAMES))])
            else:
                maps = CAPABILITY_TO_SENSORS[capability]
                sensors.extend([
                    SmartThingsSensor(
                        device, m.attribute, m.name, m.default_unit,
                        m.device_class)
                    for m in maps])
    async_add_entities(sensors)


def get_capabilities(capabilities: Sequence[str]) -> Optional[Sequence[str]]:
    """Return all capabilities supported if minimum required are present."""
    return [capability for capability in CAPABILITY_TO_SENSORS
            if capability in capabilities]


class SmartThingsSensor(SmartThingsEntity):
    """Define a SmartThings Sensor."""

    def __init__(self, device, attribute: str, name: str,
                 default_unit: str, device_class: str):
        """Init the class."""
        super().__init__(device)
        self._attribute = attribute
        self._name = name
        self._device_class = device_class
        self._default_unit = default_unit

    @property
    def name(self) -> str:
        """Return the name of the binary sensor."""
        return '{} {}'.format(self._device.label, self._name)

    @property
    def unique_id(self) -> str:
        """Return a unique ID."""
        return '{}.{}'.format(self._device.device_id, self._attribute)

    @property
    def state(self):
        """Return the state of the sensor."""
        return self._device.status.attributes[self._attribute].value

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

    @property
    def unit_of_measurement(self):
        """Return the unit this state is expressed in."""
        unit = self._device.status.attributes[self._attribute].unit
        return UNITS.get(unit, unit) if unit else self._default_unit


class SmartThingsThreeAxisSensor(SmartThingsEntity):
    """Define a SmartThings Three Axis Sensor."""

    def __init__(self, device, index):
        """Init the class."""
        super().__init__(device)
        self._index = index

    @property
    def name(self) -> str:
        """Return the name of the binary sensor."""
        return '{} {}'.format(
            self._device.label, THREE_AXIS_NAMES[self._index])

    @property
    def unique_id(self) -> str:
        """Return a unique ID."""
        return '{}.{}'.format(
            self._device.device_id, THREE_AXIS_NAMES[self._index])

    @property
    def state(self):
        """Return the state of the sensor."""
        three_axis = self._device.status.attributes[Attribute.three_axis].value
        try:
            return three_axis[self._index]
        except (TypeError, IndexError):
            return None