module Scrivito
  class WorkspaceData
    class << self
      private

      def data_attr_reader(attr_name)
        define_method(attr_name) { @data[attr_name.to_s] }
      end
    end

    data_attr_reader :id
    data_attr_reader :title
    data_attr_reader :memberships
    data_attr_reader :revision_id
    data_attr_reader :base_revision_id

    def content_state_id
      @data["content_state_id"] or raise InternalError
    end

    def content_state_id?
      @data["content_state_id"].present?
    end

    def base_content_state_id
      @data["base_content_state_id"] or raise InternalError
    end

    def base_content_state_id?
      @data["base_content_state_id"].present?
    end

    def initialize(data)
      raise InternalError unless Hash === data && data["id"].present?
      @data = data
      assert_no_obj_classes
    end

    def store_in_cache
      CmsDataCache.write_workspace_data(id, to_hash)
    end

    def content_state
      @content_state ||= ContentState.find_or_create(content_state_id) if content_state_id
    end

    def base_content_state
      if base_content_state_id
        @base_content_state ||= ContentState.find_or_create(base_content_state_id)
      end
    end

    private

    def assert_no_obj_classes
      if @data['uses_obj_classes']
        raise ScrivitoError, "The working copy titled #{title} has ObjClasses, which is no longer "\
          "supported. Please use version 0.60.0 to have CMS-based ObjClasses removed from your "\
          "working copies. See https://scrivito.com/scrivito/obj-class-migration for a "\
          "detailed guide on upgrading."
      end
    end

    def to_hash
      base_csid = base_content_state_id? ? base_content_state_id : nil

      {
        'id'                    => id,
        'revision_id'           => revision_id,
        'title'                 => title,
        'content_state_id'      => content_state_id,
        'base_revision_id'      => base_revision_id,
        'base_content_state_id' => base_csid,
        'memberships'           => memberships,
      }
    end
  end
end