module Encore
  module Entity
    module Input
      module ExposedAttributes
        extend ActiveSupport::Concern

        module ClassMethods
          # Declare a new exposed attribute
          def expose(column, opts = {})
            @exposed_attributes ||= []
            @exposed_attributes << Encore::Attribute.new(self, column.to_sym, opts)
          end

          # Return whether an attribute is exposed by the entity
          def exposed_attribute?(attribute)
            @exposed_attributes.detect { |a| attribute == a }
          end

          # Return whether an attribute is exposed by the entity
          def modifiable_attribute?(attribute)
            modifiable_attributes.include?(attribute)
          end

          # Return a list of all exposed attributes
          def exposed_attributes
            @exposed_attributes
          end

          # Return a list of all attributes that can be modified
          def modifiable_attributes
            @exposed_attributes.reject(&:readonly?)
          end
        end
      end
    end
  end
end