module Geomancer

# File lib/geomancer.rb, line 6
def self.configure(engine, opts={})
  @engine = engine
  @options = opts

  case @engine
  when :zip_code then
    require_relative './geomancer/zip_code'
  else
    require 'geocoder'

    cache = opts.delete(:cache)
    geocoder_config = { :engine => opts }
    geocoder_config[:cache] = cache if cache
    
    Geocoder.configure(geocoder_config)
  end
end

# File lib/geomancer.rb, line 26
def self.extract_lat_and_long address
  matches = LAT_LONG_RE.match(address)

  return nil if !matches

  latitude = matches["latitude"]
  longitude = matches["longitude"]

  return nil if !(latitude && longitude)

  return {:latitude => latitude.to_f, :longitude => longitude.to_f}
end

# File lib/geomancer.rb, line 43
def self.geolocate address
  return Geomancer::ZipCode.geolocate(address) if zip_code_only?(address)

  lat_and_long = extract_lat_and_long(address)
  return lat_and_long if lat_and_long

  if !@engine
    warn("No configuration provided.  Defaulting to zip code geolocator")
    configure(:zip_code)
  end

  case @engine
  when :zip_code then
    Geomancer::ZipCode.geolocate(address)
  else
    address = address.gsub(/[\r\n]/,", ") # Yahoo doesn't like newlines
    results = Geocoder.search(address)
    return nil if results.empty?

    first_result = results.first
    {:latitude => first_result.latitude, :longitude => first_result.longitude}
  end
end

# File lib/geomancer.rb, line 39
def self.zip_code_only? address
  address.match(/^\d\d\d\d\d(?:-\d\d\d\d)?$/)
end