class PHLGeocode

# File lib/phl_geocode.rb, line 12
def initialize(options={})
  @settings = {
    :min_confidence => 85,
    :api_base => "http://services.phila.gov",
    :location_path => "/ULRS311/Data/Location/",
    :address_key_path => "/ULRS311/Data/LIAddressKey/"
  }.merge(options)
end

# File lib/phl_geocode.rb, line 34
def get_address_key(address=nil)
  raise ArgumentError("Argument must be a string") unless address.is_a? String

  if address == @last_queried_address_key_addr
    @address_key_response ||= call_api('address_key', address)
  else
    @address_key_response = call_api('address_key', address)
    @last_queried_address_key_addr = address
  end

  parse_address_key @address_key_response
end

# File lib/phl_geocode.rb, line 21
def get_coordinates(address=nil)
  raise ArgumentError("Argument must be a string") unless address.is_a? String

  if address == @last_queried_coordinates_addr
    @coordinates_response ||= call_api('coordinates', address)
  else
    @coordinates_response = call_api('coordinates', address)
    @last_queried_coordinates_addr = address
  end

  parse_locations @coordinates_response
end

# File lib/phl_geocode.rb, line 74
def call_api(type, address)
  addr = URI::encode(address)
  type_path_map = {
    :coordinates => @settings[:location_path],
    :address_key => @settings[:address_key_path]
  }
  Net::HTTP.get_response(URI.parse("#{@settings[:api_base]}#{type_path_map[type.to_sym]}#{addr}"))
end

# File lib/phl_geocode.rb, line 48
def parse_address_key(response)
  key_json = JSON.parse(response.body)
  
  {
    :agency_id => key_json["AgencyID"],
    :topic_name => key_json["TopicName"],
    :topic_id => key_json["TopicID"],
    :address_ref => key_json["AddressRef"]
  }
end

# File lib/phl_geocode.rb, line 59
def parse_locations(response)
  locations_json = JSON.parse(response.body)["Locations"]

  locations_json.find_all { |loc|
    loc["Address"]["Similarity"] >= @settings[:min_confidence]
  }.map { |item|
    {
    :address => item["Address"]["StandardizedAddress"],
    :similarity => item["Address"]["Similarity"],
    :latitude => item["YCoord"],
    :longitude => item["XCoord"]
    }
  }
end