"""
:class:`GeocoderDotUS` geocoder.
"""

import csv
from base64 import b64encode
from geopy.compat import urlencode, py3k, Request
from geopy.geocoders.base import (
    Geocoder,
    DEFAULT_FORMAT_STRING,
    DEFAULT_TIMEOUT,
)
from geopy.location import Location
from geopy.exc import ConfigurationError
from geopy.util import logger, join_filter


__all__ = ("GeocoderDotUS", )


class GeocoderDotUS(Geocoder):  # pylint: disable=W0223
    """
    GeocoderDotUS geocoder, documentation at:
        http://geocoder.us/

    Note that GeocoderDotUS does not support SSL.
    """

    def __init__(
            self,
            username=None,
            password=None,
            format_string=DEFAULT_FORMAT_STRING,
            timeout=DEFAULT_TIMEOUT,
            proxies=None,
            user_agent=None,
        ):  # pylint: disable=R0913
        """
        :param str username:

        :param str password:

        :param str format_string: String containing '%s' where the
            string to geocode should be interpolated before querying the
            geocoder. For example: '%s, Mountain View, CA'. The default
            is just '%s'.

        :param int timeout: Time, in seconds, to wait for the geocoding service
            to respond before raising an :class:`geopy.exc.GeocoderTimedOut`
            exception.

            .. versionadded:: 0.97

        :param dict proxies: If specified, routes this geocoder's requests
            through the specified proxy. E.g., {"https": "192.0.2.0"}. For
            more information, see documentation on
            :class:`urllib2.ProxyHandler`.

            .. versionadded:: 0.96

        :param str user_agent: Use a custom User-Agent header.

            .. versionadded:: 1.12.0
        """
        super(GeocoderDotUS, self).__init__(
            format_string=format_string, timeout=timeout, proxies=proxies, user_agent=user_agent
        )
        if username or password:
            if not (username and password):
                raise ConfigurationError(
                    "Username and password must both specified"
                )
            self.authenticated = True
            self.api = "http://geocoder.us/member/service/namedcsv"
        else:
            self.authenticated = False
            self.api = "http://geocoder.us/service/namedcsv"
        self.username = username
        self.password = password

    def geocode(self, query, exactly_one=True, timeout=None):
        """
        Geocode a location query.

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

        :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.

            .. versionadded:: 0.97
        """
        query_str = self.format_string % query

        url = "?".join((self.api, urlencode({'address':query_str})))
        logger.debug("%s.geocode: %s", self.__class__.__name__, url)
        url = Request(url, headers=self._get_headers())
        page = self._call_geocoder(url, timeout=timeout, raw=True)
        content = page.read().decode("utf-8") if py3k else page.read() # pylint: disable=E1101,E1103
        places = [
            r for r in csv.reader(
                [content, ] if not isinstance(content, list)
                else content
            )
        ]
        if not len(places):
            return None
        if exactly_one:
            return self._parse_result(places[0])
        else:
            result = [self._parse_result(res) for res in places]
            if None in result: # todo
                return None
            return result

    @staticmethod
    def _parse_result(result):
        """
        Parse individual results. Different, but lazy actually, so... ok.
        """
        # turn x=y pairs ("lat=47.6", "long=-117.426")
        # into dict key/value pairs:
        place = dict(
            [x.split('=') for x in result if len(x.split('=')) > 1]
        )
        if 'error' in place:
            if "couldn't find" in place['error']:
                return None

        address = [
            place.get('number', None),
            place.get('prefix', None),
            place.get('street', None),
            place.get('type', None),
            place.get('suffix', None)
        ]
        city = place.get('city', None)
        state = place.get('state', None)
        zip_code = place.get('zip', None)

        name = join_filter(", ", [
            join_filter(" ", address),
            city,
            join_filter(" ", [state, zip_code])
        ])

        latitude = place.get('lat', None)
        longitude = place.get('long', None)
        if latitude and longitude:
            latlon = float(latitude), float(longitude)
        else:
            return None
        return Location(name, latlon, place)

    def _get_headers(self):
        headers = {}
        if self.authenticated:
            username_password = ":".join((self.username, self.password))
            auth = " ".join((
                "Basic",
                b64encode(username_password.encode('utf-8')).decode('utf-8')
            ))
            headers["Authorization"] = auth
        return headers