class ExercisePolicy < AdminOrAuthorPolicy
  def batch_update?
    admin?
  end

  [:show?, :feedback?, :requests_for_comments?, :statistics?].each do |action|
    define_method(action) { admin? || teacher? }
  end

  def study_group_dashboard?
    admin? || teacher_in_study_group?
  end

  [:clone?, :destroy?, :edit?, :update?, :export_external_check?, :export_external_confirm?].each do |action|
    define_method(action) { admin? || teacher_in_study_group? || author? }
  end

  [:implement?, :working_times?, :intervention?, :search?, :submit?, :reload?].each do |action|
    define_method(action) { everyone }
  end

  class Scope < Scope
    def resolve
      if @user.admin?
        @scope.all
      elsif @user.teacher?
        @scope.where('user_id = ? OR public = TRUE', @user.id)
      else
        @scope.none
      end
    end
  end
end