"""Support for Netgear routers."""
import logging
from pprint import pformat

from pynetgear import Netgear
import voluptuous as vol

from homeassistant.components.device_tracker import (
    DOMAIN,
    PLATFORM_SCHEMA,
    DeviceScanner,
)
from homeassistant.const import (
    CONF_DEVICES,
    CONF_EXCLUDE,
    CONF_HOST,
    CONF_PASSWORD,
    CONF_PORT,
    CONF_SSL,
    CONF_USERNAME,
)
import homeassistant.helpers.config_validation as cv

_LOGGER = logging.getLogger(__name__)

CONF_APS = "accesspoints"

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend(
    {
        vol.Optional(CONF_HOST, default=""): cv.string,
        vol.Optional(CONF_SSL, default=False): cv.boolean,
        vol.Optional(CONF_USERNAME, default=""): cv.string,
        vol.Required(CONF_PASSWORD): cv.string,
        vol.Optional(CONF_PORT): cv.port,
        vol.Optional(CONF_DEVICES, default=[]): vol.All(cv.ensure_list, [cv.string]),
        vol.Optional(CONF_EXCLUDE, default=[]): vol.All(cv.ensure_list, [cv.string]),
        vol.Optional(CONF_APS, default=[]): vol.All(cv.ensure_list, [cv.string]),
    }
)


def get_scanner(hass, config):
    """Validate the configuration and returns a Netgear scanner."""
    info = config[DOMAIN]
    host = info[CONF_HOST]
    ssl = info[CONF_SSL]
    username = info[CONF_USERNAME]
    password = info[CONF_PASSWORD]
    port = info.get(CONF_PORT)
    devices = info[CONF_DEVICES]
    excluded_devices = info[CONF_EXCLUDE]
    accesspoints = info[CONF_APS]

    api = Netgear(password, host, username, port, ssl)
    scanner = NetgearDeviceScanner(api, devices, excluded_devices, accesspoints)

    _LOGGER.debug("Logging in")

    results = scanner.get_attached_devices()

    if results is not None:
        scanner.last_results = results
    else:
        _LOGGER.error("Failed to Login")
        return None

    return scanner


class NetgearDeviceScanner(DeviceScanner):
    """Queries a Netgear wireless router using the SOAP-API."""

    def __init__(
        self,
        api,
        devices,
        excluded_devices,
        accesspoints,
    ):
        """Initialize the scanner."""
        self.tracked_devices = devices
        self.excluded_devices = excluded_devices
        self.tracked_accesspoints = accesspoints
        self.last_results = []
        self._api = api

    def scan_devices(self):
        """Scan for new devices and return a list with found device IDs."""
        self._update_info()

        devices = []

        for dev in self.last_results:
            tracked = (
                not self.tracked_devices
                or dev.mac in self.tracked_devices
                or dev.name in self.tracked_devices
            )
            tracked = tracked and (
                not self.excluded_devices
                or not (
                    dev.mac in self.excluded_devices
                    or dev.name in self.excluded_devices
                )
            )
            if tracked:
                devices.append(dev.mac)
                if (
                    self.tracked_accesspoints
                    and dev.conn_ap_mac in self.tracked_accesspoints
                ):
                    devices.append(f"{dev.mac}_{dev.conn_ap_mac}")

        return devices

    def get_device_name(self, device):
        """Return the name of the given device or the MAC if we don't know."""
        parts = device.split("_")
        mac = parts[0]
        ap_mac = None
        if len(parts) > 1:
            ap_mac = parts[1]

        name = None
        for dev in self.last_results:
            if dev.mac == mac:
                name = dev.name
                break

        if not name or name == "--":
            name = mac

        if ap_mac:
            ap_name = "Router"
            for dev in self.last_results:
                if dev.mac == ap_mac:
                    ap_name = dev.name
                    break

            return f"{name} on {ap_name}"

        return name

    def _update_info(self):
        """Retrieve latest information from the Netgear router.

        Returns boolean if scanning successful.
        """
        _LOGGER.debug("Scanning")

        results = self.get_attached_devices()

        if _LOGGER.isEnabledFor(logging.DEBUG):
            _LOGGER.debug("Scan result: \n%s", pformat(results))

        if results is None:
            _LOGGER.warning("Error scanning devices")

        self.last_results = results or []

    def get_attached_devices(self):
        """List attached devices with pynetgear.

        The v2 method takes more time and is more heavy on the router
        so we only use it if we need connected AP info.
        """
        if self.tracked_accesspoints:
            return self._api.get_attached_devices_2()

        return self._api.get_attached_devices()