import requests


class GeocodingCache:

    cache_max_size = 1000

    def __init__(self):
        self.geocoded_addresses = []

    def address_in_cache(self, address):
        """
        Comprueba si la direccion ya esta en la cache
        """
        for geocoded_address in self.geocoded_addresses:
            if geocoded_address['address'] == address:
                return True
        return False

    def get_coordinates(self, address):
        """
        Recupera los datos asociados a la direccion
        """
        for geocoded_address in self.geocoded_addresses:
            if geocoded_address['address'] == address:
                return geocoded_address['latitude'], \
                       geocoded_address['longitude'], \
                       geocoded_address['precision']
        return None

    def add_address(self, address, latitude, longitude, precision):
        """
        Añade la direccion a la cache y le hace sitio si es necesario
        """
        if len(self.geocoded_addresses) >= cache_max_size:
            self.geocoded_addresses.pop()

        self.geocoded_addresses.insert(0, {'address': address,
                                           'latitude': latitude,
                                           'longitude': longitude,
                                           'precision': precision})


class GeocodingTask:

    url = 'https://maps.googleapis.com/maps/api/geocode/json'

    request_parameters = {'region': 'es',
                          'key': 'AIzaSyCnKj0WnsxVZcaoxeAYkuRw3cKRNGiISYA'}

    geocoding_status_success = ['OK']
    geocoding_status_surrender = ['ZERO_RESULTS']
    geocoding_status_retry = ['OVER_QUERY_LIMIT',
                                   'REQUEST_DENIED',
                                   'INVALID_REQUEST',
                                   'UNKNOWN_ERROR']

    def __init__(self, address):
        request_paremeters['address'] = address

    def geocode(self):
        """
        Lanza la peticion de gecoding al servicio de google
        """
        self.response = requests.get(url, request_parameters)
        self.response_json = self.response.json()

    def get_request_status(self):
        """
        Devuelve el status HTTP de la request
        """
        return self.response.status_code

    def success_surrender_retry(self):
        """
        Devuelve el estado del resultado desde el punto de vista de Google
        """
        if self.response_json['status'] in geocoding_status_success:
            return "Success"
        elif self.response_json['status'] in geocoding_status_surrender:
            return "Surrender"
        else:
            return "Retry"

    def get_results(self):
        """
        Extrae los resultados del JSON de respuesta y los devuelve
        """
        results = {'latitude': self.response_json['results'][0]['geometry']['location']['lat'],
                   'longitude': self.response_json['results'][0]['geometry']['location']['lon'],
                   'precision': self.response_json['results'][0]['geometry']['location_type']}

        return results