geocoding_wrapper.rb

require "faraday"
require "json"
require "awesome_print"
require "byebug"

module Geolocation
  class Result
    attr_reader :address_components, :formatted_address, :geometry, :place_id, :types

    def initialize(address_components, formatted_address, geometry, place_id, types)
      @address_components = address_components
      @formatted_address = formatted_address
      @geometry = geometry
      @place_id = place_id
      @types = types
    end
  end

  class Address
    attr_reader :long_name, :short_name, :types

    def initialize(long_name, short_name, types)
      @long_name = long_name
      @short_name = short_name
      @types = types
    end
  end

  class Geometry
    attr_reader :bounds, :location, :location_type, :viewport

    def initialize(bounds, location, location_type, viewport)
      @bounds = bounds.map { |k, v| [k.to_sym, Geolocation::Geometry::LatLng.new(v["lat"], v["lng"])] }.to_h
      @location = LatLng.new(location["lat"], location["lng"])
      @location_type = location_type
      @viewport = viewport.map { |k, v| [k.to_sym, Geolocation::Geometry::LatLng.new(v["lat"], v["lng"])] }.to_h
    end

    LatLng = Struct.new(:latitude, :longitude)
  end

  API_KEY = "hoge" # TODO
  BASE_URL = "https://maps.googleapis.com/maps/api/geocode/json?"

  def address_lookup(address)
    parse_response Faraday.get("#{BASE_URL}address=#{address}&key=#{API_KEY}")
  rescue => e
    # TODO
  end

  def latlng_lookup
    parse_response Faraday.get("#{BASE_URL}latlng=#{latitude},#{longitude}&key=#{API_KEY}")
  rescue => e
    # TODO
  end

  private

  def parse_response(response)
    _results = JSON.parse(response.body)
    _results = _results["results"]
    _results.map do |r|
      address_components = r["address_components"].map { |a| Geolocation::Address.new(a["long_name"], a["short_name"], a["types"]) }
      g = r["geometry"]
      geometry = Geolocation::Geometry.new(g["bounds"], g["location"], g["location_type"], g["viewport"])
      Geolocation::Result.new(address_components, r["formatted_address"], geometry, r["place_id"], r["types"])
    end
  end
end