from geopy.compat import urlencode
from geopy.geocoders.base import DEFAULT_SENTINEL, Geocoder
from geopy.location import Location
from geopy.util import logger

__all__ = ("BANFrance", )


class BANFrance(Geocoder):
    """Geocoder using the Base Adresse Nationale France API.

    Documentation at:
        https://adresse.data.gouv.fr/api

    .. versionadded:: 1.18.0
    """

    geocode_path = '/search'
    reverse_path = '/reverse'

    def __init__(
            self,
            domain='api-adresse.data.gouv.fr',
            format_string=None,
            scheme=None,
            timeout=DEFAULT_SENTINEL,
            proxies=DEFAULT_SENTINEL,
            user_agent=None,
            ssl_context=DEFAULT_SENTINEL,
    ):
        """

        :param str domain: Currently it is ``'api-adresse.data.gouv.fr'``, can
            be changed for testing purposes.

        :param str format_string:
            See :attr:`geopy.geocoders.options.default_format_string`.

        :param str scheme:
            See :attr:`geopy.geocoders.options.default_scheme`.

        :param int timeout:
            See :attr:`geopy.geocoders.options.default_timeout`.

        :param dict proxies:
            See :attr:`geopy.geocoders.options.default_proxies`.

        :param str user_agent:
            See :attr:`geopy.geocoders.options.default_user_agent`.

        :type ssl_context: :class:`ssl.SSLContext`
        :param ssl_context:
            See :attr:`geopy.geocoders.options.default_ssl_context`.

        """
        super(BANFrance, self).__init__(
            format_string=format_string,
            scheme=scheme,
            timeout=timeout,
            proxies=proxies,
            user_agent=user_agent,
            ssl_context=ssl_context,
        )
        self.domain = domain.strip('/')

        self.geocode_api = (
            '%s://%s%s' % (self.scheme, self.domain, self.geocode_path)
        )
        self.reverse_api = (
            '%s://%s%s' % (self.scheme, self.domain, self.reverse_path)
        )

    def geocode(
            self,
            query,
            limit=None,
            exactly_one=True,
            timeout=DEFAULT_SENTINEL,
    ):
        """
        Return a location point by address.

        :param str query: The address or query you wish to geocode.

        :param int limit: Defines the maximum number of items in the
            response structure. If not provided and there are multiple
            results the BAN API will return 5 results by default.
            This will be reset to one if ``exactly_one`` is True.

        :param int timeout: Time, in seconds, to wait for the geocoding service
            to respond before raising a :class:`geopy.exc.GeocoderTimedOut`
            exception. Set this only if you wish to override, on this call
            only, the value set during the geocoder's initialization.

        :param bool exactly_one: Return one result or a list of results, if
            available.

        :rtype: ``None``, :class:`geopy.location.Location` or a list of them, if
            ``exactly_one=False``.

        """

        params = {
            'q': self.format_string % query,
        }

        if limit is not None:
            params['limit'] = limit

        url = "?".join((self.geocode_api, urlencode(params)))

        logger.debug("%s.geocode: %s", self.__class__.__name__, url)
        return self._parse_json(
            self._call_geocoder(url, timeout=timeout), exactly_one
        )

    def reverse(
            self,
            query,
            exactly_one=True,
            timeout=DEFAULT_SENTINEL,
    ):
        """
        Return an address by location point.

        :param query: The coordinates for which you wish to obtain the
            closest human-readable addresses.
        :type query: :class:`geopy.point.Point`, list or tuple of ``(latitude,
            longitude)``, or string as ``"%(latitude)s, %(longitude)s"``.

        :param bool exactly_one: Return one result or a list of results, if
            available.

        :param int timeout: Time, in seconds, to wait for the geocoding service
            to respond before raising a :class:`geopy.exc.GeocoderTimedOut`
            exception. Set this only if you wish to override, on this call
            only, the value set during the geocoder's initialization.

        :rtype: ``None``, :class:`geopy.location.Location` or a list of them, if
            ``exactly_one=False``.

        """

        try:
            lat, lng = self._coerce_point_to_string(query).split(',')
        except ValueError:
            raise ValueError("Must be a coordinate pair or Point")

        params = {
            'lat': lat,
            'lng': lng,
        }

        url = "?".join((self.reverse_api, urlencode(params)))
        logger.debug("%s.reverse: %s", self.__class__.__name__, url)
        return self._parse_json(
            self._call_geocoder(url, timeout=timeout), exactly_one
        )

    @staticmethod
    def _parse_feature(feature):
        # Parse each resource.
        latitude = feature.get('geometry', {}).get('coordinates', [])[1]
        longitude = feature.get('geometry', {}).get('coordinates', [])[0]
        placename = feature.get('properties', {}).get('label')

        return Location(placename, (latitude, longitude), feature)

    @classmethod
    def _parse_json(self, response, exactly_one):
        if response is None or 'features' not in response:
            return None
        features = response['features']
        if not len(features):
            return None
        if exactly_one:
            return self._parse_feature(features[0])
        else:
            return [self._parse_feature(feature) for feature in features]
