module Ecoportal
  module API
    class V2
      class Pages
        class PageStage < V2::Page
          passthrough :mould_counter, :archive
          passthrough :task_priority, :state, :status
          passthrough :votes_enabled, :upvotes, :downvotes

          embeds_many :permits, klass: "Ecoportal::API::V2::Page::Permit"
          passarray   :force_errors, :subtags, order_matters: false

          # @return [String] `id` of the stage we got the data of.
          def current_stage_id
            doc.dig("active_stage", "id") || doc["current_stage_id"]
          end

          # @return [Ecoportal::API::V2::Page::Stage]
          def current_stage
            if stage_id = current_stage_id
              stages[stage_id]
            end
          end

          # @raise [Exception] if for this page instance, there are any of:
          #   1. orphaned components (fields not belonging to any section)
          #   2. components multi-section (fields belonging to more than one section)
          #   3. orphaned sections (sections not belonging to any stage)
          def as_update(*args, **kargs)
            validate.tap do |validation|
              raise validation if validation.is_a?(String)
            end
            super(*args, **kargs)
          end

          private

          def validate
            msg   = ""
            if (orphans = components.unattached).length > 0
              msg += "There are fields not attached to any sections:"
              msg += orphans.map do |fld|
                fld.label
              end.join("\n  • ") + "\n"
            end

            if (multi = components.multi_section).length > 0
              msg += "There are fields attached to more than one section:"
              msg += orphans.map do |fld|
                fld.label
              end.join("\n  • ") + "\n"
            end

            if (orphans = sections.unattached).length > 0
              msg += "There are sections not attached to any stage:"
              msg += orphans.map do |sec|
                "'#{sec.header}' (#{sec.id})"
              end.join("\n  • ") + "\n"
            end
            msg.empty?? true : msg
          end

        end
      end
    end
  end
end