yandex_geocoder.rb

require 'rest-client'

class YandexGeocoder
  attr_reader :data, :address

  NotFound = Class.new(StandardError)
  EmptyRequest = Class.new(StandardError)

  BASE_URL = 'https://geocode-maps.yandex.ru/1.x/'.freeze
  PARAMS = {
      format: :json,
      results: 1,
      geocode: nil
  }

  def initialize(address)
    @address = address
  end

  def data
    @data ||= response(address)
  end

  def region
    data['metaDataProperty']['GeocoderMetaData']['AddressDetails']['Country']['AdministrativeArea']['AdministrativeAreaName']
  end

  def city
    address_components.select { |e| e['kind'] == 'locality' }.map { |e| e['name'] }.first
  end

  def street
    address_components.select { |e| e['kind'] == 'street' }.map { |e| e['name'] }.first
  end

  def house
    address_components.select { |e| e['kind'] == 'house' }.map { |e| e['name'] }.first
  end

  def full_address
    data['metaDataProperty']['GeocoderMetaData']['Address']['formatted']
  end

  def coords
    arr = data['Point']['pos'].split(' ').map(&:to_f).reverse
    {
        lat: arr[0],
        lon: arr[1]
    }
  end

  private

  def request(address)
    JSON.parse(RestClient.get(BASE_URL, params: PARAMS.merge(geocode: address)).body)
  end

  def response(address)
    raise EmptyRequest, "Your request is empty" if address.empty?
    result = request(address)['response']['GeoObjectCollection']
    if result['featureMember'].empty?
      response = result['metaDataProperty']['GeocoderResponseMetaData']
      raise NotFound, "Found #{response['found']} equals by request: #{response['request']}"
    else
      result['featureMember'][0]['GeoObject']
    end
  end

  def address_components
    data['metaDataProperty']['GeocoderMetaData']['Address']['Components']
  end
end