require 'http'

module Geocoder
  class Client

    API_BASE_URL = 'http://www.mapquestapi.com/geocoding/v1/address'

    def initialize(key: ENV['QUESTAPI_KEY'])
      @key             = key
      @default_options = { maxResults: 1, outFormat: 'json' }
    end

    def lat_long(location:, options: {})
      response = HTTP.get(request_url(location, options.merge(default_options)))
      parse(response)
    end

    private

    attr_reader :key, :default_options

    def request_url(location, user_options)
      query_part = user_options.map { |key, value| "#{key}=#{value}" }.join('&')
      "#{API_BASE_URL}?key=#{key}&location=#{URI.escape(location)}&#{query_part}"
    end

    def parse(response)
      json_body = JSON.parse(response.body.to_s)
      lat_long = json_body['results']&.first&.dig('locations')&.first&.dig('latLng')
      [lat_long['lat'], lat_long['lng']] if lat_long
    end
  end
end