# frozen_string_literal: true

#
# Copyright (C) 2013 - present Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas 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 Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.

module Canvas
  module DraftStateValidations
    def self.included(base)
      base.class_eval do
        validate :validate_draft_state_change, if: :workflow_state_changed?
      end
    end

    def validate_draft_state_change
      old_draft_state, new_draft_state = changes["workflow_state"]
      return if old_draft_state == new_draft_state

      if new_draft_state == "unpublished" && has_student_submissions?
        errors.add :workflow_state, I18n.t("#quizzes.cant_unpublish_when_students_submit",
                                           "Can't unpublish if there are student submissions")
      end
    end
  end
end
