require "htmlentities"
require "uri"

module Asciidoctor
  module RFC::V3
    module Blocks
      # Syntax:
      # [discrete]
      # == Section
      def floating_title(node)
        noko do |xml|
          xml.t { |xml_t| xml_t.strong node.title }
        end
      end

      # Syntax:
      #   [[id]]
      #   .name
      #   [align=left|center|right,alt=alt_text] (optional)
      #   ....
      #     literal
      #   ....
      def literal(node)
        artwork_attributes = {
          anchor: node.id,
          align: node.attr("align"),
          type: "ascii-art",
          name: node.title,
          alt: node.attr("alt"),
        }

        # NOTE: html escaping is performed by Nokogiri
        artwork_content = "\n" + node.lines.join("\n") + "\n"

        noko do |xml|
          if node.parent.context != :example
            xml.figure do |xml_figure|
              # xml_figure.artwork artwork_content, **attr_code(artwork_attributes)
              xml_figure.artwork **attr_code(artwork_attributes) do |a|
                a.cdata artwork_content
              end
            end
          else
            # xml.artwork artwork_content, **attr_code(artwork_attributes)
            xml.artwork **attr_code(artwork_attributes) do |a|
              a.cdata artwork_content
            end
          end
        end
      end

      # stem is treated as literal, but with center alignment
      def stem(node)
        artwork_attributes = {
          anchor: node.id,
          align: node.attr("align") || "center",
          type: "ascii-art",
          name: node.title,
          alt: node.attr("alt"),
        }

        # NOTE: html escaping is performed by Nokogiri
        artwork_content = "\n" + node.lines.join("\n") + "\n"

        noko do |xml|
          if node.parent.context != :example
            xml.figure do |xml_figure|
              # xml_figure.artwork artwork_content, **attr_code(artwork_attributes)
              xml_figure.artwork **attr_code(artwork_attributes) do |a|
                a.cdata artwork_content
              end
            end
          else
            # xml.artwork artwork_content, **attr_code(artwork_attributes)
            xml.artwork **attr_code(artwork_attributes) do |a|
              a.cdata artwork_content
            end
          end
        end
      end

      # Syntax:
      #   [[id]]
      #   [quote, attribution, citation info] # citation info limited to URL
      #   Text
      def quote(node)
        cite_value = node.attr("citetitle")
        cite_value = nil unless cite_value.to_s =~ URI::DEFAULT_PARSER.make_regexp

        blockquote_attributes = {
          anchor: node.id,
          quotedFrom: node.attr("attribution"),
          cite: cite_value,
        }

        noko do |xml|
          xml.blockquote **attr_code(blockquote_attributes) do |xml_blockquote|
            xml_blockquote << node.content
          end
        end
      end

      # realise as quote() ; <br/> in v3 does not have the applicability of <vspace/>,
      # it is restricted to tables
      def verse(node)
        quote(node)
      end

      # Syntax:
      #   = Title
      #   Author
      #   :HEADER
      #
      #   ABSTRACT
      #
      #   NOTE: note
      #
      #   [NOTE]
      #   .Title (in preamble)
      #   ====
      #     Content
      #   ====
      #
      #     [NOTE,removeInRFC=true] (in preamble)
      #     [NOTE,display=true|false,source=name] (in body)
      #   .Title
      #   ====
      #     Content
      #   ====
      # @note admonitions within preamble are notes. Elsewhere, they are comments.
      def admonition(node)
        result = []
        if node.parent.context == :preamble
          note_attributes = {
            removeInRFC: node.attr("remove-in-rfc"),
          }

          result << noko do |xml|
            xml.note **attr_code(note_attributes) do |xml_note|
              xml_note.name node.title unless node.title.nil?
              xml_note << HTMLEntities.new.decode([paragraph1(node)].flatten.join("\n"))
            end
          end
        else
          cref_attributes = {
            anchor: node.id,
            display: node.attr("display"),
            source: node.attr("source"),
          }

          cref_contents = node.blocks? ? flatten(node) : node.content
          cref_contents = [cref_contents].flatten.join("\n")
          warn <<~WARNING_MESSAGE if node.blocks?
            asciidoctor: WARNING (#{current_location(node)}): comment can not contain blocks of text in XML RFC:\n #{node.content}
          WARNING_MESSAGE

          result << noko do |xml|
            xml.cref **attr_code(cref_attributes) do |xml_cref|
              xml_cref << cref_contents
            end
          end
        end
        result
      end

      # Syntax:
      #   [[id]]
      #   ****
      #   Sidebar
      #   ****
      def sidebar(node)
        aside_attributes = {
          anchor: node.id,
        }
        noko do |xml|
          xml.aside **attr_code(aside_attributes) do |xml_aside|
            xml_aside << node.content
          end
        end
      end

      # Syntax:
      #   .Title
      #   ====
      #   Example
      #   ====
      def example(node)
        node.blocks.each do |b|
          unless %i{listing image literal stem}.include? b.context
            warn "asciidoctor: WARNING (#{current_location(b)}): examples (figures) should only contain listings (sourcecode), images (artwork), or literal (artwork):\n#{b.lines}"
          end
        end

        figure_attributes = {
          anchor: node.id,
        }

        noko do |xml|
          xml.figure **attr_code(figure_attributes) do |xml_figure|
            xml_figure.name node.title if node.title?
            # TODO iref
            xml_figure << node.content
          end
        end
      end

      # Syntax:
      #   .name
      #   [source,type,src=uri] (src is mutually exclusive with listing content) (v3)
      #   [source,type,src=uri,align,alt] (src is mutually exclusive with listing content) (v2)
      #   ----
      #   code
      #   ----
      def listing(node)
        sourcecode_attributes = {
          anchor: node.id,
          align: nil,
          alt: nil,
          name: node.title,
          type: node.attr("language"),
          src: node.attr("src"),
        }

        # NOTE: html escaping is performed by Nokogiri
        sourcecode_content =
          sourcecode_attributes[:src].nil? ? "\n" + node.lines.join("\n") + "\n" : ""

        noko do |xml|
          if node.parent.context != :example
            xml.figure do |xml_figure|
              # xml_figure.sourcecode sourcecode_content, **attr_code(sourcecode_attributes)
              xml_figure.sourcecode **attr_code(sourcecode_attributes) do |a|
                a.cdata sourcecode_content
              end
            end
          else
            # xml.sourcecode sourcecode_content, **attr_code(sourcecode_attributes)
            xml.sourcecode **attr_code(sourcecode_attributes) do |a|
              a.cdata sourcecode_content
            end
          end
        end
      end
    end
  end
end