"""Support for the worldtides.info API."""
from datetime import timedelta
import logging
import time

import requests
import voluptuous as vol

from homeassistant.components.sensor import PLATFORM_SCHEMA
from homeassistant.const import (
    ATTR_ATTRIBUTION,
    CONF_API_KEY,
    CONF_LATITUDE,
    CONF_LONGITUDE,
    CONF_NAME,
)
import homeassistant.helpers.config_validation as cv
from homeassistant.helpers.entity import Entity

_LOGGER = logging.getLogger(__name__)

ATTRIBUTION = "Data provided by WorldTides"

DEFAULT_NAME = "WorldTidesInfo"

SCAN_INTERVAL = timedelta(seconds=3600)

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Required(CONF_API_KEY): cv.string,
        vol.Optional(CONF_LATITUDE): cv.latitude,
        vol.Optional(CONF_LONGITUDE): cv.longitude,
        vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string,
    }
)


def setup_platform(hass, config, add_entities, discovery_info=None):
    """Set up the WorldTidesInfo sensor."""
    name = config.get(CONF_NAME)

    lat = config.get(CONF_LATITUDE, hass.config.latitude)
    lon = config.get(CONF_LONGITUDE, hass.config.longitude)
    key = config.get(CONF_API_KEY)

    if None in (lat, lon):
        _LOGGER.error("Latitude or longitude not set in Home Assistant config")

    tides = WorldTidesInfoSensor(name, lat, lon, key)
    tides.update()
    if tides.data.get("error") == "No location found":
        _LOGGER.error("Location not available")
        return

    add_entities([tides])


class WorldTidesInfoSensor(Entity):
    """Representation of a WorldTidesInfo sensor."""

    def __init__(self, name, lat, lon, key):
        """Initialize the sensor."""
        self._name = name
        self._lat = lat
        self._lon = lon
        self._key = key
        self.data = None

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

    @property
    def device_state_attributes(self):
        """Return the state attributes of this device."""
        attr = {ATTR_ATTRIBUTION: ATTRIBUTION}

        if "High" in str(self.data["extremes"][0]["type"]):
            attr["high_tide_time_utc"] = self.data["extremes"][0]["date"]
            attr["high_tide_height"] = self.data["extremes"][0]["height"]
            attr["low_tide_time_utc"] = self.data["extremes"][1]["date"]
            attr["low_tide_height"] = self.data["extremes"][1]["height"]
        elif "Low" in str(self.data["extremes"][0]["type"]):
            attr["high_tide_time_utc"] = self.data["extremes"][1]["date"]
            attr["high_tide_height"] = self.data["extremes"][1]["height"]
            attr["low_tide_time_utc"] = self.data["extremes"][0]["date"]
            attr["low_tide_height"] = self.data["extremes"][0]["height"]
        return attr

    @property
    def state(self):
        """Return the state of the device."""
        if self.data:
            if "High" in str(self.data["extremes"][0]["type"]):
                tidetime = time.strftime(
                    "%I:%M %p", time.localtime(self.data["extremes"][0]["dt"])
                )
                return f"High tide at {tidetime}"
            if "Low" in str(self.data["extremes"][0]["type"]):
                tidetime = time.strftime(
                    "%I:%M %p", time.localtime(self.data["extremes"][0]["dt"])
                )
                return f"Low tide at {tidetime}"
            return None
        return None

    def update(self):
        """Get the latest data from WorldTidesInfo API."""
        start = int(time.time())
        resource = (
            "https://www.worldtides.info/api?extremes&length=86400"
            "&key={}&lat={}&lon={}&start={}"
        ).format(self._key, self._lat, self._lon, start)

        try:
            self.data = requests.get(resource, timeout=10).json()
            _LOGGER.debug("Data: %s", self.data)
            _LOGGER.debug("Tide data queried with start time set to: %s", start)
        except ValueError as err:
            _LOGGER.error("Error retrieving data from WorldTidesInfo: %s", err.args)
            self.data = None
