area.rb

if RUBY_VERSION.to_f >= 1.9 # ;_;
  require 'csv'
else
  require 'rubygems'
  require 'faster_csv'
end

require 'area/array'
require 'area/integer'
require 'area/string'

module Area
  ZIP_PATH = File.join(File.dirname(__FILE__), '..', 'data', 'zipcodes.csv')
  AREA_PATH = File.join(File.dirname(__FILE__), '..', 'data', 'areacodes.csv')

  def self.area_codes
    @area_codes ||= RUBY_VERSION.to_f >= 1.9 ? CSV.read(AREA_PATH) : FasterCSV.parse(AREA_PATH)
  end

  def self.zip_codes
    @zip_codes ||= RUBY_VERSION.to_f >= 1.9 ? CSV.read(ZIP_PATH) : FasterCSV.parse(ZIP_PATH)
  end

  def self.regions
    regions = []
    area_codes.map{|row| regions << row.last.upcase }
    return regions
  end

  def self.code?(code)
    if code.to_s.length == 3
      return code
    else
      raise ArgumentError, "You must provide a valid area code", caller
    end
  end

  def self.code_or_zip?(code)
    if code.to_s.length == 3 or code.to_s.length == 5
      return code
    else
      raise ArgumentError, "You must provide a valid area or zip code", caller
    end
  end

  def self.zip?(code)
    if code.to_s.length == 5
      return code
    else
      raise ArgumentError, "You must provide zip code", caller
    end
  end

  def self.state_or_territory?(state)
    if self.regions.include?(state.upcase)
      return state
    else
      raise ArgumentError, "You must provide a valid US state abbreviation or territory name", caller
    end
  end

  def self.zip_or_territory?(state)
    if self.regions.include?(state.upcase) or self.zip?(state)
      return state
    else
      raise ArgumentError, "You must provide a valid US state abbreviation or zipcode.", caller
    end
  end

end