#!/usr/bin/ruby
# Copyright 2014 Oracle | BlueKai

require 'digest'

'''
 Demonstration on email and phone hashing
'''
class Hashing

  def normalizePhoneNumber(phoneNumber)
    phoneNumber.strip.gsub(/^0+/, "").gsub(/[^0-9]+/, "")
  end


  def normalizeEmail(email)
    email.strip.downcase.gsub(/\+[^@]*@/, "@")
  end

  def createHash(stringToHash, algorithm)
    algorithms = {
    'sha256'=> lambda { |s| Digest::SHA256.hexdigest(s.to_s)}
    }
    procedure = algorithms[algorithm]
    raise "#{algorithm} algorithm is not supported" if procedure.nil?
    procedure.call stringToHash
  end


  def createEmailHash(email, algorithm)
    createHash normalizeEmail(email), algorithm
  end

  def createPhoneHash(phone, algorithm)
    createHash normalizePhoneNumber(phone), algorithm
  end
end

if __FILE__ == $0

  def assert(actual, expected)
      raise "'#{actual}' is expected to be equal to '#{expected}'" if actual != expected
  end

  hashCreator = Hashing.new
  assert hashCreator.normalizeEmail("  Test@somewhere.com    "), "test@somewhere.com"
  assert hashCreator.normalizeEmail("Test+alias@gMail.Com    "), "test@gmail.com"
  assert hashCreator.normalizePhoneNumber("   00123-456-7890 "), "1234567890"
  assert hashCreator.createEmailHash("  Test@somewhere.com   ", "sha256"), "c6835820412cddddd5197dab400fec65c3d9a2617ae4ceb1442ec753abeec0ba"
  assert hashCreator.createPhoneHash("   00123-456-7890  ", "sha256"), "c775e7b757ede630cd0aa1113bd102661ab38829ca52a6422ab782862f268646"
  puts "All tests pass!"
end