require 'asciidoctor'
require 'asciidoctor/extensions'
require 'asciidoctor/converter/docbook5'
require 'asciidoctor/converter/html5'

module Git
  module Documentation
    class LinkGitProcessor < Asciidoctor::Extensions::InlineMacroProcessor
      use_dsl

      named :chrome

      def process(parent, target, attrs)
        prefix = parent.document.attr('git-relative-html-prefix')
        if parent.document.doctype == 'book'
          "<ulink url=\"#{prefix}#{target}.html\">" \
          "#{target}(#{attrs[1]})</ulink>"
        elsif parent.document.basebackend? 'html'
          %(<a href="#{prefix}#{target}.html">#{target}(#{attrs[1]})</a>)
        elsif parent.document.basebackend? 'docbook'
          "<citerefentry>\n" \
            "<refentrytitle>#{target}</refentrytitle>" \
            "<manvolnum>#{attrs[1]}</manvolnum>\n" \
          "</citerefentry>"
        end
      end
    end

    class DocumentPostProcessor < Asciidoctor::Extensions::Postprocessor
      def process document, output
        if document.basebackend? 'docbook'
          output = output.sub(/<refmiscinfo class="source">.*?<\/refmiscinfo>/, "")
          output = output.sub(/<refmiscinfo class="manual">.*?<\/refmiscinfo>/, "")
          output = output.sub(/<date>.*?<\/date>/, "<date>@GIT_DATE@</date>")
          new_tags = "" \
            "<refmiscinfo class=\"source\">Git @GIT_VERSION@</refmiscinfo>\n" \
            "<refmiscinfo class=\"manual\">Git Manual</refmiscinfo>\n"
          output = output.sub(/<\/refmeta>/, new_tags + "</refmeta>")
        end
        output
      end
    end

    class SynopsisBlock < Asciidoctor::Extensions::BlockProcessor

      use_dsl
      named :synopsis
      parse_content_as :simple

      def process parent, reader, attrs
        outlines = reader.lines.map do |l|
          l.gsub(/(\.\.\.?)([^\]$\. ])/, '{empty}`\1`{empty}\2')
           .gsub(%r{([\[\] |()>]|^)([-a-zA-Z0-9:+=~@,/_^\$\\\*]+)}, '\1{empty}`\2`{empty}')
           .gsub(/(<[-a-zA-Z0-9.]+>)/, '__\\1__')
           .gsub(']', ']{empty}')
        end
        create_block parent, :verse, outlines, attrs
      end
    end

    class GitDBConverter < Asciidoctor::Converter::DocBook5Converter

      extend Asciidoctor::Converter::Config
      register_for 'docbook5'

      def convert_inline_quoted node
        if (type = node.type) == :asciimath
          # NOTE fop requires jeuclid to process mathml markup
          asciimath_available? ? %(<inlineequation>#{(::AsciiMath.parse node.text).to_mathml 'mml:', 'xmlns:mml' => 'http://www.w3.org/1998/Math/MathML'}</inlineequation>) : %(<inlineequation><mathphrase><![CDATA[#{node.text}]]></mathphrase></inlineequation>)
        elsif type == :latexmath
          # unhandled math; pass source to alt and required mathphrase element; dblatex will process alt as LaTeX math
          %(<inlineequation><alt><![CDATA[#{equation = node.text}]]></alt><mathphrase><![CDATA[#{equation}]]></mathphrase></inlineequation>)
        elsif type == :monospaced
          node.text.gsub(/(\.\.\.?)([^\]$\.])/, '<literal>\1</literal>\2')
              .gsub(/^\.\.\.?$/, '<literal>\0</literal>')
              .gsub(%r{([\[\s|()>.]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@/_^\$\\\*%]+\.{0,2})+|,)}, '\1<literal>\2</literal>')
              .gsub(/(&lt;[-a-zA-Z0-9.]+&gt;)/, '<emphasis>\1</emphasis>')
        else
          open, close, supports_phrase = QUOTE_TAGS[type]
          text = node.text
          if node.role
            if supports_phrase
              quoted_text = %(#{open}<phrase role="#{node.role}">#{text}</phrase>#{close})
            else
              quoted_text = %(#{open.chop} role="#{node.role}">#{text}#{close})
            end
          else
            quoted_text = %(#{open}#{text}#{close})
          end
          node.id ? %(<anchor#{common_attributes node.id, nil, text}/>#{quoted_text}) : quoted_text
        end
      end
    end

    # register a html5 converter that takes in charge to convert monospaced text into Git style synopsis
    class GitHTMLConverter < Asciidoctor::Converter::Html5Converter

      extend Asciidoctor::Converter::Config
      register_for 'html5'

      def convert_inline_quoted node
        if node.type == :monospaced
          node.text.gsub(/(\.\.\.?)([^\]$.])/, '<code>\1</code>\2')
              .gsub(/^\.\.\.?$/, '<code>\0</code>')
              .gsub(%r{([\[\s|()>.]|^|\]|&gt;)(\.?([-a-zA-Z0-9:+=~@,/_^\$\\\*%]+\.{0,2})+)}, '\1<code>\2</code>')
              .gsub(/(&lt;[-a-zA-Z0-9.]+&gt;)/, '<em>\1</em>')

        else
          open, close, tag = QUOTE_TAGS[node.type]
          if node.id
            class_attr = node.role ? %( class="#{node.role}") : ''
            if tag
              %(#{open.chop} id="#{node.id}"#{class_attr}>#{node.text}#{close})
            else
              %(<span id="#{node.id}"#{class_attr}>#{open}#{node.text}#{close}</span>)
            end
          elsif node.role
            if tag
              %(#{open.chop} class="#{node.role}">#{node.text}#{close})
            else
              %(<span class="#{node.role}">#{open}#{node.text}#{close}</span>)
            end
          else
            %(#{open}#{node.text}#{close})
          end
        end
      end
    end
  end
end

Asciidoctor::Extensions.register do
  inline_macro Git::Documentation::LinkGitProcessor, :linkgit
  block Git::Documentation::SynopsisBlock
  postprocessor Git::Documentation::DocumentPostProcessor
end