# frozen_string_literal: true

# Redmine - project management software
# Copyright (C) 2006-  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine
  module WikiFormatting
    module CommonMark
      # configuration of the rendering pipeline
      PIPELINE_CONFIG = {
        # https://github.com/gjtorikian/commonmarker#extension-options
        commonmarker_extensions: {
          table: true,
          strikethrough: true,
          tagfilter: true,
          autolink: true,
          footnotes: true,
          header_ids: nil,
          tasklist: true,
          shortcodes: false,
          alerts: true,
          cjk_friendly_emphasis: true,
        }.freeze,

        # https://github.com/gjtorikian/commonmarker#parse-options
        commonmarker_parse_options: {
        }.freeze,

        # https://github.com/gjtorikian/commonmarker#render-options
        commonmarker_render_options: {
          unsafe: true,
          github_pre_lang: false,
          hardbreaks: Redmine::Configuration['common_mark_enable_hardbreaks'] == true,
          tasklist_classes: true,
        }.freeze,
        commonmarker_plugins: {
          syntax_highlighter: nil
        }.freeze,
      }.freeze

      SANITIZER = SanitizationFilter.new
      SCRUBBERS = [
        Redmine::WikiFormatting::CopypreScrubber.new,
        SyntaxHighlightScrubber.new,
        Redmine::WikiFormatting::TablesortScrubber.new,
        FixupAutoLinksScrubber.new,
        ExternalLinksScrubber.new,
        AlertsIconsScrubber.new
      ]

      class Formatter
        include Redmine::WikiFormatting::SectionHelper

        def initialize(text, options = {})
          @text = text
          @options = options
        end

        def to_html(*args)
          html = MarkdownFilter.new(@text, PIPELINE_CONFIG).call
          fragment = Redmine::WikiFormatting::HtmlParser.parse(html)
          SANITIZER.call(fragment)

          scrubbers = SCRUBBERS + post_processor_scrubbers
          scrubber = Loofah::Scrubber.new do |node|
            scrubbers.each do |s|
              result = s.scrub(node)
              break result if result == Loofah::Scrubber::STOP
              break if node.parent.nil?
            end
          end

          fragment.scrub!(scrubber)
          fragment.to_s
        end

        private

        def post_processor_scrubbers
          [
            Redmine::WikiFormatting::InlineAttachmentsScrubber.new(@options),
            Redmine::WikiFormatting::HiresImagesScrubber.new
          ]
        end
      end
    end
  end
end
