module Barometer
  #
  # A simple Geo class
  # 
  # Used to store location data from Graticule or HTTParty and convert
  # into just the data needed for geocoding
  #
  class Geo
    
    attr_accessor :latitude, :longitude
    attr_accessor :locality, :region, :country, :country_code, :address
    
    #
    # this will take a Location object (either generated by Graticule
    # or HTTParty), and fill in the applicable data
    #
    def initialize(location=nil)
      return unless location
      
      has_graticule = false
      begin
        Graticule
        has_graticule = true
      rescue
        # do nothing, Graticule not available
      end
      
      if has_graticule
        raise ArgumentError unless
          (location.is_a?(Graticule::Location) || location.is_a?(Hash))
      else
        raise ArgumentError unless location.is_a?(Hash)
      end
      
      if has_graticule && location.class == Graticule::Location
        self.build_from_graticule(location)
      elsif location.class == Hash
        self.build_from_httparty(location)
      end
      self
    end
    
    def build_from_graticule(location=nil)
      return nil unless location
      
      begin
        require 'rubygems'
        require 'graticule'
        $:.unshift(File.dirname(__FILE__))
        # load some changes to Graticule
        # TODO: attempt to get changes into Graticule gem
        require 'extensions/graticule'
      end

      raise ArgumentError unless location.is_a?(Graticule::Location)
      
      @latitude = location.latitude
      @longitude = location.longitude
      @locality = location.locality
      @region = location.region
      @country = location.country
      @country_code = location.country_code
      @address = location.address_line
    end
    
    def build_from_httparty(location=nil)
      return nil unless location
      raise ArgumentError unless location.is_a?(Hash)
      
      placemark = location["Placemark"]
      placemark = placemark.first if placemark.is_a?(Array)
      
      if placemark && placemark["Point"] && placemark["Point"]["coordinates"]
        @latitude = placemark["Point"]["coordinates"].split(',')[1].to_f
        @longitude = placemark["Point"]["coordinates"].split(',')[0].to_f
      end
      if placemark && placemark["AddressDetails"] && placemark["AddressDetails"]["Country"]
        if placemark["AddressDetails"]["Country"]["AdministrativeArea"]
          if placemark["AddressDetails"]["Country"]["AdministrativeArea"]["SubAdministrativeArea"]
            locality = placemark["AddressDetails"]["Country"]["AdministrativeArea"]["SubAdministrativeArea"]["Locality"]
          else
            locality = placemark["AddressDetails"]["Country"]["AdministrativeArea"]["Locality"]
          end
          if locality
            @locality = locality["LocalityName"]
          end
          @region = placemark["AddressDetails"]["Country"]["AdministrativeArea"]["AdministrativeAreaName"]
        end
        @country = placemark["AddressDetails"]["Country"]["CountryName"]
        @country_code = placemark["AddressDetails"]["Country"]["CountryNameCode"]
        @address = placemark["AddressDetails"]["Country"]["AddressLine"]
      end
    end
    
    def coordinates
      [@latitude, @longitude].join(',')
    end
    
  end
end