class ActiveFedora::Associations::Builder::Association

def self.add_destroy_callbacks(model, reflection)
  name = reflection.name
  model.before_destroy ->(o) { o.association(name).handle_dependency }
end

def self.better_name(name)
  name
end

def self.build(model, name, options, &block)
  if model.dangerous_attribute_method?(name)
    Deprecation.warn(ActiveFedora::Base, "You tried to define an association named #{name} on the model #{model.name}, but " \
                         "this will conflict with a method #{name} already defined by ActiveFedora. " \
                         "Please choose a different association name.")
  end
  extension = define_extensions model, name, &block
  reflection = create_reflection model, name, nil, options, extension
  define_accessors(model, reflection)
  define_callbacks(model, reflection)
  define_validations model, reflection
  reflection
end

def self.build_scope(scope, extension)
  new_scope = scope
  new_scope = proc { instance_exec(&scope) } if scope && scope.arity == 0
  new_scope = wrap_scope new_scope, extension if extension
  new_scope
end

def self.check_dependent_options(dependent)
  unless valid_dependent_options.include? dependent
    raise ArgumentError, "The :dependent option must be one of #{valid_dependent_options}, but is :#{dependent}"
  end
end

def self.create_reflection(model, name, scope, options, extension = nil)
  unless name.is_a?(Symbol)
    name = name.to_sym
    Deprecation.warn(ActiveFedora::Base, "association names must be a Symbol")
  end
  validate_options(options)
  translate_property_to_predicate(options)
  scope = build_scope(scope, extension)
  name = better_name(name)
  ActiveFedora::Reflection.create(macro, name, scope, options, model)
end

def self.define_accessors(model, reflection)
  mixin = model.generated_association_methods
  name = reflection.name
  define_readers(mixin, name)
  define_writers(mixin, name)
end

def self.define_callbacks(model, reflection)
  if dependent = reflection.options[:dependent]
    check_dependent_options(dependent)
    add_destroy_callbacks(model, reflection)
  end
  Association.extensions.each do |extension|
    extension.build model, reflection
  end
end

def self.define_extensions(_model, _name)
end

def self.define_readers(mixin, name)
  mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
    def #{name}(*args)
      association(:#{name}).reader(*args)
    end
  CODE
end

def self.define_validations(_model, _reflection)
  # noop
end

def self.define_writers(mixin, name)
  mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
    def #{name}=(value)
      association(:#{name}).writer(value)
    end
  CODE
end

def self.macro
  raise NotImplementedError
end

def self.predicate(property)
  return property if property.is_a? RDF::URI
  ActiveFedora::Predicates.find_graph_predicate(property)
end

def self.translate_property_to_predicate(options)
  return unless options[:property]
  Deprecation.warn Association, "the :property option to `#{model}.#{macro} :#{name}' is deprecated and will be removed in active-fedora 10.0. Use :predicate instead", caller(5)
  options[:predicate] = predicate(options.delete(:property))
end

def self.valid_dependent_options
  raise NotImplementedError
end

def self.valid_options(_options)
  VALID_OPTIONS + Association.extensions.flat_map(&:valid_options)
end

def self.validate_options(options)
  options.assert_valid_keys(valid_options(options))
end

def self.wrap_scope(scope, _extension)
  scope
end