require 'ostruct'
require 'test/unit'
require File.join(File.dirname(__FILE__),"..","lib","refcode.rb")

class RefcodeTest < Test::Unit::TestCase

  SECRET = "686cb0461769ebed556f56bc88c956bfdf786646ab1920f58201723c557ccbaeb57112fd53302c06475e6e19a176ba617ee284b091d375858cb259e8578c620f"
  SALT = "dcc74de5efdab0d80b5d763f8a63bef3d37c7453ee45446fbbccd26648af8ca6a112576dafbf5475f3cd7b968703cc9e0682ee45b8b622045cec287908f536e8"

  class BareEncodableObject < OpenStruct
    include Refcode::Encodable
  end
  class EncodableObject < BareEncodableObject
    has_refcode :secret => SECRET, :salt => :record_id
  end

  def test_encoder_against_hash
    test_hash = { :channel => 'email', :record_id => 49203, :action => 'forward' }
    assert_equal test_hash, encode_and_decode(test_hash)
  end

  def test_encoder_against_string
    test_string = "secret referral data"
    assert_equal test_string, encode_and_decode(test_string)
  end

  def test_encoder_against_int
    assert_equal 4857, encode_and_decode(4857)
  end

  def test_encoder_against_open_struct
    test_struct = OpenStruct.new({:test => 42})
    assert_equal test_struct, encode_and_decode(test_struct)
  end

  def test_should_raise_argument_error_if_generate_refcode_called_without_val
    assert_raise ArgumentError do
      encodable_object.generate_refcode
    end
  end

  def test_should_raise_error_if_generate_refcode_called_before_has_refcode
    assert_raise ArgumentError do
      obj = BareEncodableObject.new :some => 'value'
      obj.generate_refcode
    end
  end

  def test_should_raise_an_error_if_salt_is_empty
    encodable_object.record_id = nil
    assert_raise RuntimeError do
      referral_code_content = { :channel => 'email', :action => 'forward', :user_id => 14325 }
      code = encodable_object.generate_refcode referral_code_content
      assert_equal referral_code_content, encodable_object.parse_refcode(code)
    end
  end

  def test_encodable_against_hash
    referral_code_content = { :channel => 'email', :action => 'forward', :user_id => 14325 }
    code = encodable_object.generate_refcode referral_code_content
    assert_equal referral_code_content, encodable_object.parse_refcode(code)
  end

  private

  def encodable_object
    @encodable_object ||= EncodableObject.new :name => 'Unimportant Value', :record_id => 381598
  end

  def encoder
    @encoder ||= Refcode::Encoder.new do |e|
      e.secret = SECRET
      e.salt = SALT
    end
  end

  def encode_and_decode val
    encoder.decode(encoder.encode(val))
  end

end