module Contentful
  module Management
    module Resource
      # Adds metadata logic for [Resource] classes
      module Metadata
        # Returns the metadata hash
        #
        # @return [Hash] Metadata
        def metadata
          @metadata
        end

        # @private
        def initialize(object = nil, *)
          super
          @metadata = {}
          extract_metadata_from_object! object if object
        end

        # @private
        def inspect(info = nil)
          if metadata.empty?
            super(info)
          else
            super("#{info} @metadata=#{metadata.inspect}")
          end
        end

        private

        def extract_metadata_from_object!(object)
          return unless object.key?('metadata')
          object['metadata'].each do |key, value|
            @metadata[key.to_sym] = if key == 'tags'
                                      coerce_tags(value)
                                    else
                                      value
                                    end
          end
        end

        def coerce_tags(tags)
          tags.map { |tag| Contentful::Management::Link.new(tag) }
        end
      end
    end
  end
end