require "isodoc"
require "htmlentities"
require_relative "fileprocess"
require_relative "../../util/fontist_helper"
require_relative "../../util/util"
require_relative "../filelookup/filelookup"
require_relative "../multilingual/multilingual"
require_relative "utils"
require_relative "render_word"
require_relative "navigation"

module Metanorma
  class Collection
    class Renderer
      FORMATS = %i[html xml doc pdf].freeze

      attr_accessor :isodoc, :nested
      attr_reader :xml, :compile, :compile_options, :documents, :outdir,
                  :manifest

      # This is only going to render the HTML collection
      # @param xml [Metanorma::Collection] input XML collection
      # @param folder [String] input folder
      # @param options [Hash]
      # @option options [String] :coverpage cover page HTML (Liquid template)
      # @option options [Array<Symbol>] :format list of formats (xml,html,doc,pdf)
      # @option options [String] :output_folder output directory
      #
      # We presuppose that the bibdata of the document is equivalent to that of
      # the collection, and that the flavour gem can sensibly process it. We may
      # need to enhance metadata in the flavour gems isodoc/metadata.rb with
      # collection metadata
      def initialize(collection, folder, options = {}) # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
        check_options options
        @xml = Nokogiri::XML collection.to_xml # @xml is the collection manifest
        @xml.root.default_namespace = "http://metanorma.org"
        @lang = collection.bibdata.language.first || "en"
        @script = collection.bibdata.script.first || "Latn"
        @locale = @xml.at("//xmlns:bibdata/xmlns:locale")&.text
        @registry = Metanorma::Registry.instance
        @doctype = doctype
        @compile = Compile.new
        @compile.load_flavor(@doctype)

        @isodoc = isodoc_create # output processor for flavour
        @outdir = dir_name_cleanse(options[:output_folder])
        @coverpage = options[:coverpage] || collection.coverpage
        @format = ::Metanorma::Util.sort_extensions_execution(options[:format])
        @compile_options = options[:compile] || {}
        @compile_options[:install_fonts] = true if options[:install_fonts]
        @log = options[:log]
        @bibdata = collection.bibdata
        @documents = collection.documents
        @bibdatas = collection.documents
        @directives = collection.directives
        @dirname = collection.dirname
        @manifest = collection.manifest.config
        @disambig = Util::DisambigFiles.new
        @prefatory = collection.prefatory
        @final = collection.final
        @c = HTMLEntities.new
        @files_to_delete = []
        @nested = options[:nested]
        # if false, this is the root instance of Renderer
        # if true, then this is not the last time Renderer will be run
        # (e.g. this is sectionsplit)

        # list of files in the collection
        @files = Metanorma::Collection::FileLookup.new(folder, self)
        @files.add_section_split
        isodoc_populate
        create_non_existing_directory(@outdir)
      end

      def flush_files
        warn "\n\n\n\n\nDone: #{DateTime.now.strftime('%H:%M:%S')}"
        warn @files.files_to_delete
        @files.files_to_delete.each { |f| FileUtils.rm_f(f) }
        @files_to_delete.each { |f| FileUtils.rm_f(f) }
      end

      # @param col [Metanorma::Collection] XML collection
      # @param options [Hash]
      # @option options [String] :coverpage cover page HTML (Liquid template)
      # @option options [Array<Symbol>] :format list of formats
      # @option options [Strong] :ourput_folder output directory
      def self.render(col, options = {})
        warn "\n\n\n\n\nRender Init: #{DateTime.now.strftime('%H:%M:%S')}"
        cr = new(col, File.dirname(col.file), options)
        cr.files
        cr.concatenate(col, options)
        options[:format]&.include?(:html) and cr.coverpage
        cr.flush_files
        cr
      end

      def concatenate(col, options)
        warn "\n\n\n\n\nConcatenate: #{DateTime.now.strftime('%H:%M:%S')}"
        concatenate_presentation?(options) and
          options[:format] << :presentation
        concatenate_prep(col, options)
        concatenate_outputs(options)
      end

      def concatenate_presentation?(options)
        !(options[:format] & %i(pdf doc)).empty? ||
          (@directives.detect { |d| d.key == "bilingual" } &&
          options[:format].include?(:html))
      end

      def concatenate_prep(col, options)
        %i(xml presentation).each do |e|
          options[:format].include?(e) or next
          ext = e == :presentation ? "presentation.xml" : e.to_s
          File.open(File.join(@outdir, "collection.#{ext}"), "w:UTF-8") do |f|
            b = concatenate1(col.clone, e).to_xml
            e == :presentation and b = concatenate_presentation(b)
            f.write(b)
          end
        end
      end

      def concatenate_presentation(xml)
        xml.sub!("<metanorma-collection>", "<metanorma-collection xmlns='http://metanorma.org'>")
        # TODO BEING FORCED TO DO THAT BECAUSE SHALE IS NOT DEALING WITH DEFAULT NAMESPACES
        @directives.detect { |d| d.key == "bilingual" } and
          xml = Metanorma::Collection::Multilingual
            .new({ align_cross_elements: %w(p note) }).to_bilingual(xml)
        xml
      end

      def concatenate_outputs(options)
        pres = File.join(@outdir, "collection.presentation.xml")
        options[:format].include?(:pdf) and pdfconv.convert(pres)
        options[:format].include?(:doc) and docconv_convert(pres)
        @directives.detect { |d| d.key == "bilingual" } &&
          options[:format].include?(:html) and
          Metanorma::Collection::Multilingual.new(
            { doctype: doctype.to_sym,
              converter_options: PdfOptionsNode.new(doctype, @compile_options),
              outdir: @outdir },
          ).to_html(pres)
      end

      def concatenate1(out, ext)
        out.directives << ::Metanorma::Collection::Config::Directive
          .new(key: "documents-inline")
        out.bibdatas.each_key do |ident|
          id = @isodoc.docid_prefix(nil, ident.dup)
          @files.get(id, :attachment) || @files.get(id, :outputs).nil? and next
          out.documents[Util::key id] =
            Metanorma::Collection::Document
              .raw_file(@files.get(id, :outputs)[ext])
        end
        out
      end

      # infer the flavour from the first document identifier; relaton does that
      def doctype
        if (docid = @xml.at("//bibdata/docidentifier/@type")&.text)
          dt = docid.downcase
        elsif (docid = @xml.at("//bibdata/docidentifier")&.text)
          dt = docid.sub(/\s.*$/, "").lowercase
        else return "standoc"
        end
        @registry.alias(dt.to_sym)&.to_s || dt
      end

      # populate liquid template of ARGV[1] with metadata extracted from
      # collection manifest
      def coverpage
        @coverpage or return
        warn "\n\n\n\n\nCoverpage: #{DateTime.now.strftime('%H:%M:%S')}"
        File.open(File.join(@outdir, "index.html"), "w:UTF-8") do |f|
          f.write @isodoc.populate_template(File.read(@coverpage))
        end
      end
    end
  end
end