module Asciidoctor
  module Standoc
    module Lists
      def iso_publisher(t, code)
        code.sub(/ .*$/, "").split(/\//).each do |abbrev|
          t.contributor do |c|
            c.role **{ type: "publisher" }
            c.organization do |org|
              organization(org, abbrev)
            end
          end
        end
      end

      def plaintxt
        { format: "text/plain" }
      end

      def ref_attributes(m)
        { id: m[:anchor], type: "standard" }
      end

      def set_date_range(date, text)
        matched = /^(?<from>[0-9]+)(-+(?<to>[0-9]+))?$/.match text
        return unless matched[:from]
        if matched[:to]
          date.from matched[:from]
          date.to matched[:to]
        else
          date.on matched[:from]
        end
      end

      def use_my_anchor(ref, id)
        ref.parent.elements.last["id"] = id
        ref
      end

      def id_and_year(id, year)
        return id unless year
        "#{id}:#{year}"
      end

      def docid(t, code)
        type, code1 = @bibdb&.docid_type(code) unless /^\[\d+\]$/.match(code)
        t.docidentifier (code1 || code), **attr_code(type: type)
      end

      def isorefmatches(xml, m)
        ref = fetch_ref xml, m[:code], m[:year]
        return use_my_anchor(ref, m[:anchor]) if ref
        xml.bibitem **attr_code(ref_attributes(m)) do |t|
          t.title(**plaintxt) { |i| i << ref_normalise(m[:text]) }
          docid(t, id_and_year(m[:code], m[:year]))
          m[:year] and t.date **{ type: "published" } do |d|
            set_date_range(d, m[:year])
          end
          iso_publisher(t, m[:code])
        end
      end

      def isorefmatches2(xml, m)
        ref = fetch_ref xml, m[:code], nil, no_year: true, note: m[:fn]
        return use_my_anchor(ref, m[:anchor]) if ref
        xml.bibitem **attr_code(ref_attributes(m)) do |t|
          t.title(**plaintxt) { |i| i << ref_normalise(m[:text]) }
          docid(t, id_and_year(m[:code], "--"))
          t.date **{ type: "published" } do |d|
            d.on "--" 
          end
          iso_publisher(t, m[:code])
          t.note(**plaintxt) { |p| p << "ISO DATE: #{m[:fn]}" }
        end
      end

      def conditional_date(t, m, noyr)
        m.names.include?("year") and !m[:year].nil? and
          t.date(**{ type: "published" }) do |d|
          if noyr then d.on "--"
          else
            set_date_range(d, m[:year])
          end
        end
      end

      def isorefmatches3(xml, m)
        hasyr =  m.names.include?("year") && m[:year] != "--"
        noyr =  m.names.include?("year") && m[:year] == "--"
        ref = fetch_ref xml, m[:code], hasyr ? m[:year] : nil, 
          all_parts: true, no_year: noyr
        return use_my_anchor(ref, m[:anchor]) if ref
        xml.bibitem(**attr_code(ref_attributes(m))) do |t|
          t.title(**plaintxt) { |i| i << ref_normalise(m[:text]) }
          docid(t, id_and_year(m[:code], m[:year]) + " (all parts)")
          conditional_date(t, m, noyr)
          iso_publisher(t, m[:code])
          t.note(**plaintxt) { |p| p << "ISO DATE: #{m[:fn]}" } if m.names.include?("fn") && m[:fn]
          t.allparts "true"
        end
      end

      def fetch_ref(xml, code, year, **opts)
        return nil if opts[:no_year]
        hit = @bibdb&.fetch(code, year, opts) 
        return nil if hit.nil?
        xml.parent.add_child(Utils::smart_render_xml(hit))
        xml
      rescue Algolia::AlgoliaProtocolError
        nil # Render reference without an Internet connection.
      end

      def refitem_render(xml, m)
        xml.bibitem **attr_code(id: m[:anchor]) do |t|
          t.formattedref **{ format: "application/x-isodoc+xml" } do |i|
            i << ref_normalise_no_format(m[:text])
          end
          docid(t, /^\d+$/.match(m[:code]) ? "[#{m[:code]}]" : m[:code])
        end
      end

      # TODO: alternative where only title is available
      def refitem(xml, item, node)
        unless m = NON_ISO_REF.match(item)
          Utils::warning(node, "no anchor on reference", item) 
          return
        end
        unless m[:code] && /^\d+$/.match(m[:code])
          ref = fetch_ref xml, m[:code], 
            m.names.include?("year") ? m[:year] : nil, {}
          return use_my_anchor(ref, m[:anchor]) if ref
        end
        refitem_render(xml, m)
      end

      def ref_normalise(ref)
        ref.
          # gsub(/&#8201;&#8212;&#8201;/, " -- ").
          gsub(/&amp;amp;/, "&amp;").
          gsub(%r{^<em>(.*)</em>}, "\\1")
      end

      def ref_normalise_no_format(ref)
        ref.
          # gsub(/&#8201;&#8212;&#8201;/, " -- ").
          gsub(/&amp;amp;/, "&amp;")
      end

      ISO_REF = %r{^<ref\sid="(?<anchor>[^"]+)">
      \[(?<code>(ISO|IEC)[^0-9]*\s[0-9-]+|IEV)
      (:(?<year>[0-9][0-9-]+))?\]</ref>,?\s
      (?<text>.*)$}xm

      ISO_REF_NO_YEAR = %r{^<ref\sid="(?<anchor>[^"]+)">
      \[(?<code>(ISO|IEC)[^0-9]*\s[0-9-]+):--\]</ref>,?\s?
      <fn[^>]*>\s*<p>(?<fn>[^\]]+)</p>\s*</fn>,?\s?(?<text>.*)$}xm

      ISO_REF_ALL_PARTS = %r{^<ref\sid="(?<anchor>[^"]+)">
      \[(?<code>(ISO|IEC)[^0-9]*\s[0-9]+)(:(?<year>--|[0-9][0-9-]+))?\s
      \(all\sparts\)\]</ref>,?\s
      (<fn[^>]*>\s*<p>(?<fn>[^\]]+)</p>\s*</fn>,?\s?)?(?<text>.*)$}xm

      NON_ISO_REF = %r{^<ref\sid="(?<anchor>[^"]+)">
      \[(?<code>[^\]]+?)([:-](?<year>(19|20)[0-9][0-9]))?\]</ref>,?\s
      (?<text>.*)$}xm

      # @param item [String]
      # @return [Array<MatchData>]
      def reference1_matches(item)
        matched = ISO_REF.match item
        matched2 = ISO_REF_NO_YEAR.match item
        matched3 = ISO_REF_ALL_PARTS.match item
        [matched, matched2, matched3]
      end

      # @param node [Asciidoctor::List]
      # @param item [String]
      # @param xml [Nokogiri::XML::Builder]
      def reference1(node, item, xml)
        matched, matched2, matched3 = reference1_matches(item)
        if matched3.nil? && matched2.nil? && matched.nil?
          refitem(xml, item, node)
          # elsif fetch_ref(matched3 || matched2 || matched, xml)
        elsif !matched.nil? then isorefmatches(xml, matched)
        elsif !matched2.nil? then isorefmatches2(xml, matched2)
        elsif !matched3.nil? then isorefmatches3(xml, matched3)
        end
      end

      def reference(node)
        noko do |xml|
          node.items.each do |item|
            reference1(node, item.text, xml)
          end
        end.join("\n")
      end

      def global_bibliocache_name
        "#{Dir.home}/.relaton/cache"
      end

      def local_bibliocache_name(cachename)
        return nil if cachename.nil?
        cachename = "relaton" if cachename.empty?
        "#{cachename}/cache"
      end

      def ievcache_name(global)
        global ?  "#{Dir.home}/.iev.pstore" :
          "#{@filename}.iev.pstore"
      end
    end
  end
end