module Confidentiality
  class GenerateReadMethodsError < StandardError
  end
  
  class DuplicateError < StandardError
  end
  
  # The string returned for confidential fields
  mattr_accessor :string
  self.string = "(confidential)"
  
  mattr_accessor :_ignore
  self._ignore = false
  
  # All confidentiality will be ignored while the block is executed
  class << self
    def ignore
      original_value = self._ignore
      self._ignore = true
      result = yield
      self._ignore = original_value
      result
    end
    
    alias_method :ignore?, :_ignore
    
    def included(base)
      return if base.included_modules.include?(Confidentiality::InstanceMethods)
      
      base.class_eval do
        extend Confidentiality::ClassMethods
        include Confidentiality::InstanceMethods
        
        class << self
          alias_method_chain :reset_column_information, :confidential_methods
        end
        
        alias_method_chain :valid?, :confidentiality
      end
    end
  end
end

class ActiveRecord::Base
  include Confidentiality
end

class ActionView::Base
  include Confidentiality::FormHelper
end