# frozen_string_literal: true

module Resolvers
  module DesignManagement
    class DesignAtVersionResolver < BaseResolver
      include Gitlab::Graphql::Authorize::AuthorizeResource

      type Types::DesignManagement::DesignAtVersionType, null: false

      authorize :read_design

      argument :id, GraphQL::ID_TYPE,
               required: true,
               description: 'The Global ID of the design at this version'

      def resolve(id:)
        authorized_find!(id: id)
      end

      def find_object(id:)
        dav = GitlabSchema.object_from_id(id, expected_type: ::DesignManagement::DesignAtVersion)
        return unless consistent?(dav)

        dav
      end

      def self.single
        self
      end

      private

      # If this resolver is mounted on something that has an issue
      # (such as design collection for instance), then we should check
      # that the DesignAtVersion as found by its ID does in fact belong
      # to this issue.
      def consistent?(dav)
        issue.nil? || (dav&.design&.issue_id == issue.id)
      end

      def issue
        object&.issue
      end
    end
  end
end