module MapCoder

# File lib/mapcoder.rb, line 18
def self.coordinates(address)
  raise EmptyAddressError if address.nil? || address.empty?
  escaped_address = CGI.escape(address)
  url = "#{REQUEST_URL}?address=#{escaped_address}&sensor=false"
  attempt_number = 0

  loop do
    attempt_number += 1

    begin
      raw_response = RestClient.get(url)
    rescue
      return { status: :api_unavailable }
    end

    response = JSON.parse(raw_response)
    status = response['status']

    if status == GOOGLE_API_SUCCESSFUL_RESPONSE
      coordinates = response['results'].map { |result| result['geometry']['location'] }
      coordinates.map! { |result| { latitude: result['lat'], longitude: result['lng'] } }
      return { status: :ok, coordinates: coordinates }

    elsif status == GOOGLE_API_NOT_FOUND_RESPONSE
      return { status: :ok, coordinates: [] } 

    elsif status == GOOGLE_API_OVER_QUERY_LIMIT_RESPONSE
      if attempt_number == 1
        # Failed for the first time, sleep for 2 seconds and retry
        sleep 2
      else
        # Failed again, we are limited for the day
        return { status: :over_daily_limit }
      end
      
    else
      raise UnknownGoogleAPIResponseError
    end
  end
end