ama-team / ruby-entity-mapper

require_relative '../mixin/errors'

module AMA

  module Entity

    class Mapper

      class Type

        # This class represents parameter type - an unknown-until-runtime type

        # that belongs to particular other type. For example,

        # Hash<Symbol, Integer> may be described as Type(Hash) with

        # parameters _key: Symbol and _value: Integer

        class Parameter

          include Mixin::Errors

          # @!attribute type

          #   @return [AMA::Entity::Mapper::Type]

          attr_reader :owner

          # @!attribute id

          #   @return [Symbol]

          attr_reader :id

          # @param [AMA::Entity::Mapper::Type] owner

          # @param [Symbol] id

          def initialize(owner, id)

            @owner = owner

            @id = id

          end

          def instance?(_)

            false

          end

          def resolve_parameter(*)

            self

          end

          def resolved?

            false

          end

          def resolved!(context = nil)

            compliance_error("Type #{self} is not resolved", context: context)

          end

          def to_s

            "Parameter #{owner.type}.#{id}"

          end

          def to_def

            "#{owner.type}.#{id}"

          end

          def hash

            @owner.hash ^ @id.hash

          end

          def eql?(other)

            return false unless other.is_a?(self.class)

            @id == other.id && @owner == other.owner

          end

      end

    end

  end

end