# frozen_string_literal: true

module DiscourseCalendar
  class Calendar
    DATA_PREFIX ||= "data-calendar-"

    def self.extract(post)
      cooked = PrettyText.cook(post.raw, topic_id: post.topic_id, user_id: post.user_id)

      Nokogiri::HTML(cooked).css('div.calendar').map do |cooked_calendar|
        calendar = {}

        cooked_calendar.attributes.values.each do |attribute|
          if attribute.name.start_with?(DATA_PREFIX)
            calendar[attribute.name[DATA_PREFIX.length..-1]] = CGI.escapeHTML(attribute.value || "")
          end
        end

        calendar
      end
    end

    def self.update(post)
      calendar = extract(post)
      return destroy(post) if calendar.size != 1
      calendar = calendar.first

      post.custom_fields[DiscourseCalendar::CALENDAR_CUSTOM_FIELD] = calendar.delete("type") || "dynamic"
      post.save_custom_fields

      Post.where(topic_id: post.topic_id).each { |p| CalendarEvent.update(p) }
    end

    def self.destroy(post)
      return if post.custom_fields[DiscourseCalendar::CALENDAR_CUSTOM_FIELD].blank?

      post.custom_fields.delete(DiscourseCalendar::CALENDAR_CUSTOM_FIELD)
      post.save_custom_fields

      CalendarEvent.where(topic_id: post.topic_id).destroy_all
    end
  end
end