"""
Support for the Lyft API.

For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/sensor.lyft/
"""
import logging
from datetime import timedelta

import voluptuous as vol

from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.helpers.entity import Entity
from homeassistant.util import Throttle
import homeassistant.helpers.config_validation as cv

REQUIREMENTS = ['lyft_rides==0.2']

_LOGGER = logging.getLogger(__name__)

CONF_CLIENT_ID = 'client_id'
CONF_CLIENT_SECRET = 'client_secret'
CONF_END_LATITUDE = 'end_latitude'
CONF_END_LONGITUDE = 'end_longitude'
CONF_PRODUCT_IDS = 'product_ids'
CONF_START_LATITUDE = 'start_latitude'
CONF_START_LONGITUDE = 'start_longitude'

ICON = 'mdi:taxi'

MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=60)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
    vol.Required(CONF_CLIENT_ID): cv.string,
    vol.Required(CONF_CLIENT_SECRET): cv.string,
    vol.Required(CONF_START_LATITUDE): cv.latitude,
    vol.Required(CONF_START_LONGITUDE): cv.longitude,
    vol.Optional(CONF_END_LATITUDE): cv.latitude,
    vol.Optional(CONF_END_LONGITUDE): cv.longitude,
    vol.Optional(CONF_PRODUCT_IDS, default=None):
        vol.All(cv.ensure_list, [cv.string]),
})


def setup_platform(hass, config, add_devices, discovery_info=None):
    """Set up the Lyft sensor."""
    from lyft_rides.auth import ClientCredentialGrant
    from lyft_rides.errors import APIError

    auth_flow = ClientCredentialGrant(client_id=config.get(CONF_CLIENT_ID),
                                      client_secret=config.get(
                                          CONF_CLIENT_SECRET),
                                      scopes="public",
                                      is_sandbox_mode=False)
    try:
        session = auth_flow.get_session()

        timeandpriceest = LyftEstimate(
            session, config[CONF_START_LATITUDE], config[CONF_START_LONGITUDE],
            config.get(CONF_END_LATITUDE), config.get(CONF_END_LONGITUDE))
        timeandpriceest.fetch_data()
    except APIError as exc:
        _LOGGER.error("Error setting up Lyft platform: %s", exc)
        return False

    wanted_product_ids = config.get(CONF_PRODUCT_IDS)

    dev = []
    for product_id, product in timeandpriceest.products.items():
        if (wanted_product_ids is not None) and \
           (product_id not in wanted_product_ids):
            continue
        dev.append(LyftSensor('time', timeandpriceest, product_id, product))
        if product.get('estimate') is not None:
            dev.append(LyftSensor(
                'price', timeandpriceest, product_id, product))
    add_devices(dev, True)


class LyftSensor(Entity):
    """Implementation of an Lyft sensor."""

    def __init__(self, sensorType, products, product_id, product):
        """Initialize the Lyft sensor."""
        self.data = products
        self._product_id = product_id
        self._product = product
        self._sensortype = sensorType
        self._name = '{} {}'.format(
            self._product['display_name'], self._sensortype)
        if 'lyft' not in self._name.lower():
            self._name = 'Lyft{}'.format(self._name)
        if self._sensortype == 'time':
            self._unit_of_measurement = 'min'
        elif self._sensortype == 'price':
            estimate = self._product['estimate']
            if estimate is not None:
                self._unit_of_measurement = estimate.get('currency')
        self._state = None

    @property
    def name(self):
        """Return the name of the sensor."""
        return self._name

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

    @property
    def unit_of_measurement(self):
        """Return the unit of measurement of this entity, if any."""
        return self._unit_of_measurement

    @property
    def device_state_attributes(self):
        """Return the state attributes."""
        params = {
            'Product ID': self._product['ride_type'],
            'Product display name': self._product['display_name'],
            'Vehicle Capacity': self._product['seats']
        }

        if self._product.get('pricing_details') is not None:
            pricing_details = self._product['pricing_details']
            params['Base price'] = pricing_details.get('base_charge')
            params['Cancellation fee'] = pricing_details.get(
                'cancel_penalty_amount')
            params['Minimum price'] = pricing_details.get('cost_minimum')
            params['Cost per mile'] = pricing_details.get('cost_per_mile')
            params['Cost per minute'] = pricing_details.get('cost_per_minute')
            params['Price currency code'] = pricing_details.get('currency')
            params['Service fee'] = pricing_details.get('trust_and_service')

        if self._product.get("estimate") is not None:
            estimate = self._product['estimate']
            params['Trip distance (in miles)'] = estimate.get(
                'estimated_distance_miles')
            params['High price estimate (in cents)'] = estimate.get(
                'estimated_cost_cents_max')
            params['Low price estimate (in cents)'] = estimate.get(
                'estimated_cost_cents_min')
            params['Trip duration (in seconds)'] = estimate.get(
                'estimated_duration_seconds')

            params['Prime Time percentage'] = estimate.get(
                'primetime_percentage')

        if self._product.get("eta") is not None:
            eta = self._product['eta']
            params['Pickup time estimate (in seconds)'] = eta.get(
                'eta_seconds')

        return {k: v for k, v in params.items() if v is not None}

    @property
    def icon(self):
        """Icon to use in the frontend, if any."""
        return ICON

    def update(self):
        """Get the latest data from the Lyft API and update the states."""
        self.data.update()
        try:
            self._product = self.data.products[self._product_id]
        except KeyError:
            return
        self._state = None
        if self._sensortype == 'time':
            eta = self._product['eta']
            if (eta is not None) and (eta.get('is_valid_estimate')):
                time_estimate = eta.get('eta_seconds')
                if time_estimate is None:
                    return
                self._state = int(time_estimate / 60)
        elif self._sensortype == 'price':
            estimate = self._product['estimate']
            if (estimate is not None) and \
               estimate.get('is_valid_estimate'):
                self._state = (int(
                    (estimate.get('estimated_cost_cents_min', 0) +
                     estimate.get('estimated_cost_cents_max', 0)) / 2) / 100)


class LyftEstimate(object):
    """The class for handling the time and price estimate."""

    def __init__(self, session, start_latitude, start_longitude,
                 end_latitude=None, end_longitude=None):
        """Initialize the LyftEstimate object."""
        self._session = session
        self.start_latitude = start_latitude
        self.start_longitude = start_longitude
        self.end_latitude = end_latitude
        self.end_longitude = end_longitude
        self.products = None

    @Throttle(MIN_TIME_BETWEEN_UPDATES)
    def update(self):
        """Get the latest product info and estimates from the Lyft API."""
        from lyft_rides.errors import APIError
        try:
            self.fetch_data()
        except APIError as exc:
            _LOGGER.error("Error fetching Lyft data: %s", exc)

    def fetch_data(self):
        """Get the latest product info and estimates from the Lyft API."""
        from lyft_rides.client import LyftRidesClient
        client = LyftRidesClient(self._session)

        self.products = {}

        products_response = client.get_ride_types(
            self.start_latitude, self.start_longitude)

        products = products_response.json.get('ride_types')

        for product in products:
            self.products[product['ride_type']] = product

        if self.end_latitude is not None and self.end_longitude is not None:
            price_response = client.get_cost_estimates(
                self.start_latitude, self.start_longitude,
                self.end_latitude, self.end_longitude)

            prices = price_response.json.get('cost_estimates', [])

            for price in prices:
                product = self.products[price['ride_type']]
                if price.get("is_valid_estimate"):
                    product['estimate'] = price

        eta_response = client.get_pickup_time_estimates(
            self.start_latitude, self.start_longitude)

        etas = eta_response.json.get('eta_estimates')

        for eta in etas:
            if eta.get("is_valid_estimate"):
                self.products[eta['ride_type']]['eta'] = eta
