require "asciidoctor"
require "metanorma/standoc/converter"
require "fileutils"
require_relative "front"

module Metanorma
  module Generic
    class Converter < Standoc::Converter
      XML_ROOT_TAG = "generic-standard".freeze
      XML_NAMESPACE = "https://www.metanorma.org/ns/generic".freeze

      register_for "generic"

      def xml_root_tag
        configuration.xml_root_tag || XML_ROOT_TAG
      end

      def xml_namespace
        configuration.document_namespace || XML_NAMESPACE
      end

      def baselocation(loc)
        return nil if loc.nil?

        return loc
        File.expand_path(File.join(File.dirname(
                                     self.class::_file || __FILE__,
                                   ), "..", "..", "..", loc))
      end

      def docidentifier_cleanup(xmldoc)
        template = configuration.docid_template ||
          "{{ organization_name_short }} {{ docnumeric }}"
        docid = xmldoc.at("//bibdata/docidentifier")
        id = boilerplate_isodoc(xmldoc).populate_template(template, nil)
        id.empty? and docid.remove or docid.children = id
      end

      def doctype(node)
        d = super
        configuration.doctypes or return d == "article" ?
          (configuration.default_doctype || "standard") : d
        type = configuration.default_doctype ||
          configuration.doctypes.keys.dig(0) || "standard"
        unless configuration.doctypes.keys.include? d
          @log.add("Document Attributes", nil,
                   "#{d} is not a legal document type: reverting to '#{type}'")
          d = type
        end
        d
      end

      def read_config_file(path_to_config_file)
        Metanorma::Generic.configuration
          .set_default_values_from_yaml_file(path_to_config_file)
      end

      def sectiontype_streamline(ret)
        if configuration&.termsdefs_titles&.map(&:downcase)&.include? ret
          "terms and definitions"
        elsif configuration&.symbols_titles&.map(&:downcase)&.include? ret
          "symbols and abbreviated terms"
        elsif configuration&.normref_titles&.map(&:downcase)&.include? ret
          "normative references"
        elsif configuration&.bibliography_titles&.map(&:downcase)&.include? ret
          "bibliography"
        else
          super
        end
      end

      def document(node)
        read_config_file(node.attr("customize")) if node.attr("customize")
        super
      end

      def outputs(node, ret)
        File.open("#{@filename}.xml", "w:UTF-8") { |f| f.write(ret) }
        presentation_xml_converter(node)&.convert("#{@filename}.xml")
        html_converter(node)&.convert("#{@filename}.presentation.xml",
                                      nil, false, "#{@filename}.html")
        doc_converter(node)&.convert("#{@filename}.presentation.xml",
                                     nil, false, "#{@filename}.doc")
        pdf_converter(node)&.convert("#{@filename}.presentation.xml",
                                     nil, false, "#{@filename}.pdf")
      end

      def validate(doc)
        content_validate(doc)
        schema_validate(formattedstr_strip(doc.dup),
                        baselocation(configuration.validate_rng_file) ||
                        File.join(File.dirname(__FILE__), "generic.rng"))
      end

      def content_validate(doc)
        super
        bibdata_validate(doc.root)
      end

      def bibdata_validate(doc)
        stage_validate(doc)
        committee_validate(doc)
      end

      def stage_validate(xmldoc)
        stages = configuration&.stage_abbreviations&.keys || return
        stages.empty? and return
        stage = xmldoc&.at("//bibdata/status/stage")&.text
        stages.include? stage or
          @log.add("Document Attributes", nil,
                   "#{stage} is not a recognised status")
      end

      def committee_validate(xmldoc)
        committees = Array(configuration&.committees) || return
        committees.empty? and return
        xmldoc.xpath("//bibdata/ext/editorialgroup/committee").each do |c|
          committees.include? c.text or
            @log.add("Document Attributes", nil,
                     "#{c.text} is not a recognised committee")
        end
      end

      def sections_cleanup(xml)
        super
        xml.xpath("//*[@inline-header]").each do |h|
          h.delete("inline-header")
        end
      end

      def blank_method(*args); end

      def html_converter(node)
        IsoDoc::Generic::HtmlConvert.new(html_extract_attributes(node))
      end

      def presentation_xml_converter(node)
        IsoDoc::Generic::PresentationXMLConvert
          .new(html_extract_attributes(node))
      end

      alias_method :pdf_converter, :html_converter
      alias_method :style, :blank_method
      alias_method :title_validate, :blank_method

      def doc_converter(node)
        IsoDoc::Generic::WordConvert.new(doc_extract_attributes(node))
      end

      def configuration
        Metanorma::Generic.configuration
      end

      def boilerplate_isodoc(xmldoc)
        conv = super
        Metanorma::Generic::Configuration::CONFIG_ATTRS.each do |a|
          conv.meta.set(a, configuration.send(a))
        end
        conv
      end

      def boilerplate_file(xmldoc)
        f = configuration.boilerplate
        f.nil? and return super
        f.is_a? String and return baselocation(f)
        f.is_a? Hash and f[@lang] and return baselocation(f[@lang])
        super
      end

      def cleanup(xmldoc)
        super
        empty_metadata_cleanup(xmldoc)
        xmldoc
      end

      def empty_metadata_cleanup(xmldoc)
        xmldoc.xpath("//bibdata/ext//*").each do |x|
          x.remove if x.children.empty?
        end
      end
    end
  end
end