# frozen_string_literal: true

class ExercisePolicy < AdminOrAuthorPolicy
  def batch_update?
    admin?
  end

  %i[show? feedback? statistics? external_user_statistics? rfcs_for_exercise?].each do |action|
    define_method(action) { admin? || teacher_in_study_group? || (teacher? && @record.public?) || author? }
  end

  def study_group_dashboard?
    admin? || teacher_in_study_group?
  end

  def submission_statistics?
    admin? || teacher_in_study_group?
  end

  def detailed_statistics?
    admin?
  end

  %i[clone? destroy? edit? update?].each do |action|
    define_method(action) { admin? || teacher_in_study_group? || author? }
  end

  %i[export_external_check? export_external_confirm?].each do |action|
    define_method(action) { (admin? || teacher_in_study_group? || author?) && @user.codeharbor_link }
  end

  %i[implement? working_times? intervention? search? reload?].each do |action|
    define_method(action) do
      return no_one unless @record.files.visible.exists?

      admin? || teacher_in_study_group? || author? || (everyone && !@record.unpublished?)
    end
  end

  def submit?
    everyone && @record.teacher_defined_assessment?
  end

  class Scope < Scope
    def resolve
      if @user.admin?
        @scope.all
      elsif @user.teacher?
        @scope.where(
          'exercises.user_id IN (SELECT user_id FROM study_group_memberships WHERE study_group_id IN (?))
          OR (exercises.user_id = ? AND exercises.user_type = ?)
          OR public = TRUE',
          @user.study_groups.pluck(:id),
          @user.id, @user.class.name
        )
      else
        @scope.none
      end
    end
  end
end