module ActionText
  class Attachment
    include Attachments::TrixConversion, Attachments::Minification, Attachments::Caching

    TAG_NAME = "action-text-attachment"
    SELECTOR = TAG_NAME
    ATTRIBUTES = %w( sgid content-type url href filename filesize width height previewable presentation caption )

    class << self
      def fragment_by_canonicalizing_attachments(content)
        fragment_by_minifying_attachments(fragment_by_converting_trix_attachments(content))
      end

      def from_node(node, attachable = nil)
        new(node, attachable || ActionText::Attachable.from_node(node))
      end

      def from_attachables(attachables)
        Array(attachables).map { |attachable| from_attachable(attachable) }.compact
      end

      def from_attachable(attachable, attributes = {})
        if node = node_from_attributes(attachable.to_rich_text_attributes(attributes))
          new(node, attachable)
        end
      end

      def from_attributes(attributes, attachable = nil)
        if node = node_from_attributes(attributes)
          from_node(node, attachable)
        end
      end

      private
        def node_from_attributes(attributes)
          if attributes = process_attributes(attributes).presence
            ActionText::HtmlConversion.create_element(TAG_NAME, attributes)
          end
        end

        def process_attributes(attributes)
          attributes.transform_keys { |key| key.to_s.underscore.dasherize }.slice(*ATTRIBUTES)
        end
    end

    attr_reader :node, :attachable

    delegate :to_param, to: :attachable
    delegate_missing_to :attachable

    def initialize(node, attachable)
      @node = node
      @attachable = attachable
    end

    def caption
      node_attributes["caption"].presence
    end

    def full_attributes
      node_attributes.merge(attachable_attributes).merge(sgid_attributes)
    end

    def with_full_attributes
      self.class.from_attributes(full_attributes, attachable)
    end

    def to_plain_text
      if respond_to?(:attachable_plain_text_representation)
        attachable_plain_text_representation(caption)
      else
        caption.to_s
      end
    end

    def to_html
      HtmlConversion.node_to_html(node)
    end

    def to_s
      to_html
    end

    def inspect
      "#<#{self.class.name} attachable=#{attachable.inspect}>"
    end

    private
      def node_attributes
        @node_attributes ||= ATTRIBUTES.map { |name| [ name.underscore, node[name] ] }.to_h.compact
      end

      def attachable_attributes
        @attachable_attributes ||= (attachable.try(:to_rich_text_attributes) || {}).stringify_keys
      end

      def sgid_attributes
        @sgid_attributes ||= node_attributes.slice("sgid").presence || attachable_attributes.slice("sgid")
      end
  end
end