require "date"
require "twitter_cldr"
require "pubid-iso"
require "pubid-cen"
require "pubid-iec"

module Metanorma
  module ISO
    class Converter < Standoc::Converter
      def metadata_id(node, xml)
        if id = node.attr("docidentifier")
          xml.docidentifier id, **attr_code(type: "ISO")
        else iso_id(node, xml)
        end
        node.attr("tc-docnumber")&.split(/,\s*/)&.each do |n|
          xml.docidentifier(n, **attr_code(type: "iso-tc"))
        end
      end

      DOCTYPE2HASHID =
        { directive: :dir, "technical-report": :tr, "guide": :guide,
          "technical-specification": :ts,
          "publicly-available-specification": :pas,
          "committee-document": :tc, "recommendation": :r }.freeze

      # @param type [nil, :tr, :ts, :amd, :cor, :guide, :dir, :tc, Type]
      # document's type, eg. :tr, :ts, :amd, :cor, Type.new(:tr)
      def get_typeabbr(node, amd: false)
        node.attr("amendment-number") and return :amd
        node.attr("corrigendum-number") and return :cor
        DOCTYPE2HASHID[doctype(node).to_sym]
      end

      def iso_id(node, xml)
        (!@amd && node.attr("docnumber") || node.attr("adopted-from")) ||
          (@amd && node.attr("updates")) or return
        params = iso_id_params(node)
        iso_id_out(xml, params, true)
      end

      def iso_id_params(node)
        params = iso_id_params_core(node)
        params2 = iso_id_params_add(node)
        num = node.attr("docnumber")
        orig = node.attr("updates") || node.attr("adopted-from")
        /[[:alpha:]]/.match?(num) and orig ||= num
        orig and orig_id = orig_id_parse(orig)
        iso_id_params_resolve(params, params2, node, orig_id)
      end

      def cen?(str)
        /^C?EN/.match?(str)
      end

      def orig_id_parse(orig)
        cen?(orig) and return Pubid::Cen::Identifier::Base.parse(orig)
        ret = case orig
              when /^ISO/ then Pubid::Iso::Identifier::Base.parse(orig)
              when /^IEC/ then Pubid::Iec::Identifier::Base.parse(orig)
              else base_pubid::Base.parse(orig)
              end
        ret.edition ||= 1
        ret
      end

      def base_pubid
        Pubid::Iso::Identifier
      end

      def pubid_select(params)
        if cen?(Array(params[:publisher])&.first || "")
          Pubid::Cen::Identifier
        else base_pubid
        end
      end

      def compact_blank(hash)
        hash.compact.reject { |_, v| v.is_a?(String) && v.empty? }
      end

      # unpublished is for internal use
      def iso_id_params_core(node)
        pub = iso_id_pub(node)
        ret = { number: node.attr("docnumber"),
                part: node.attr("partnumber"),
                language: node.attr("language") || "en",
                type: get_typeabbr(node),
                publisher: pub[0],
                unpublished: /^[0-5]/.match?(get_stage(node)),
                copublisher: pub[1..-1] }
        ret[:copublisher].empty? and ret.delete(:copublisher)
        compact_blank(ret)
      end

      def iso_id_pub(node)
        (node.attr("publisher") || default_publisher).split(/[;,]/)
          .map(&:strip).map { |x| org_abbrev[x] || x }
      end

      def iso_id_params_add(node)
        stage = iso_id_stage(node)
        ret = { number: node.attr("amendment-number") ||
          node.attr("corrigendum-number"),
                year: iso_id_year(node),
                iteration: node.attr("iteration") }
        iso_id_stage_populate(ret, node, stage)
        tc_number(ret, node)
        compact_blank(ret)
      end

      def tc_number(ret, node)
        doctype(node) == "committee-document" or return ret
        { sc: "subcommittee", tc: "technical-committee",
          wg: "workgroup" }.each do |k, v|
          n = node.attr("#{v}-number") and
            ret.merge!({ "#{k}type": node.attr("#{v}-type") || k.to_s.upcase,
                         "#{k}number": n })
        end
        ret
      end

      def iso_id_stage_populate(ret, node, stage)
        if stage && !cen?(node.attr("publisher"))
          ret[:stage] = stage
          ret[:stage] == "60.00" and ret[:stage] = :PRF
        end
        ret
      end

      def iso_id_stage(node)
        "#{get_stage(node)}.#{get_substage(node)}"
      end

      def iso_id_year(node)
        (node.attr("copyright-year") || node.attr("updated-date") ||
         node.attr("published-date"))
          &.sub(/-.*$/, "") || Date.today.year
      end

      def iso_id_params_resolve(params, params2, node, orig_id)
        if orig_id && (node.attr("amendment-number") ||
            node.attr("corrigendum-number"))
          %i(unpublished part).each { |x| params.delete(x) }
          params2[:base] = orig_id
        elsif orig_id &&
            ![Pubid::Iso::Identifier,
              Pubid::Iec::Identifier].include?(pubid_select(params))
          params2[:adopted] = orig_id
        end
        params.merge!(params2)
        params
      end

      def iso_id_out(xml, params, with_prf)
        cen?(params[:publisher]) and return cen_id_out(xml, params)
        iso_id_out_common(xml, params, with_prf)
        @amd and return
        iso_id_out_non_amd(xml, params, with_prf)
      rescue StandardError, *STAGE_ERROR => e
        clean_abort("Document identifier: #{e}", xml)
      end

      def cen_id_out(xml, params)
        xml.docidentifier iso_id_default(params).to_s, **attr_code(type: "CEN")
      end

      def iso_id_out_common(xml, params, with_prf)
        xml.docidentifier iso_id_default(params).to_s(with_prf: with_prf),
                          **attr_code(type: "ISO")
        xml.docidentifier iso_id_reference(params)
          .to_s(format: :ref_num_short, with_prf: with_prf),
                          **attr_code(type: "iso-reference")
        xml.docidentifier iso_id_reference(params).urn, **attr_code(type: "URN")
      end

      def iso_id_out_non_amd(xml, params, with_prf)
        xml.docidentifier iso_id_undated(params).to_s(with_prf: with_prf),
                          **attr_code(type: "iso-undated")
        xml.docidentifier iso_id_with_lang(params)
          .to_s(format: :ref_num_long, with_prf: with_prf),
                          **attr_code(type: "iso-with-lang")
      end

      def iso_id_default(params)
        params_nolang = params.dup.tap { |hs| hs.delete(:language) }
        params1 = if params[:unpublished]
                    params_nolang.dup.tap { |hs| hs.delete(:year) }
                  else params_nolang
                  end
        params1.delete(:unpublished)
        pubid_select(params1).create(**params1)
      end

      def iso_id_undated(params)
        params_nolang = params.dup.tap { |hs| hs.delete(:language) }
        params2 = params_nolang.dup.tap do |hs|
          hs.delete(:year)
          hs.delete(:unpublished)
        end
        pubid_select(params2).create(**params2)
      end

      def iso_id_with_lang(params)
        params1 = if params[:unpublished]
                    params.dup.tap { |hs| hs.delete(:year) }
                  else params end
        params1.delete(:unpublished)
        pubid_select(params1).create(**params1)
      end

      def iso_id_reference(params)
        params1 = params.dup.tap { |hs| hs.delete(:unpublished) }
        pubid_select(params1).create(**params1)
      end

      def structured_id(node, xml)
        node.attr("docnumber") or return
        part, subpart = node&.attr("partnumber")&.split("-")
        xml.structuredidentifier do |i|
          i.project_number(node.attr("docnumber"), **attr_code(
            part: part, subpart: subpart,
            amendment: node.attr("amendment-number"),
            corrigendum: node.attr("corrigendum-number"),
            origyr: node.attr("created-date")
          ))
        end
      end

      def id_add_year(docnum, node)
        year = node.attr("copyright-year")
        @amd and year ||= node.attr("updated-date")&.sub(/-.*$/, "")
        docnum += ":#{year}" if year
        docnum
      end

      def get_stage(node)
        a = node.attr("status")
        a = node.attr("docstage") if a.nil? || a.empty?
        a = "60" if a.nil? || a.empty?
        a
      end

      def get_substage(node)
        stage = get_stage(node)
        ret = node.attr("docsubstage")
        ret = (stage == "60" ? "60" : "00") if ret.nil? || ret.empty?
        ret
      end
    end
  end
end