# frozen_string_literal: true

#
# Copyright (C) 2014 - 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 Polling
  class PollChoiceSerializer < Canvas::APISerializer
    root :poll_choice

    attributes :id, :text, :is_correct, :position

    has_one :poll, embed: :id

    def_delegators :object, :poll
    def_delegators :@controller, :api_v1_poll_url

    def filter(_keys)
      if is_teacher?
        student_keys + teacher_keys
      else
        student_keys
      end
    end

    def poll_url
      api_v1_poll_url(poll)
    end

    private

    def is_teacher?
      poll.grants_right?(current_user, session, :update)
    end

    def teacher_keys
      [:is_correct]
    end

    def student_keys
      keys = %i[id text position]
      keys << :is_correct if poll.closed_and_viewable_for?(current_user)
      keys
    end
  end
end
