a11yist/app/models/element.rb

# frozen_string_literal: true

class Element < ApplicationRecord
  has_rich_text :description

  belongs_to :page, touch: true
  has_many :success_criteria, -> { order(:position) }, dependent: :destroy

  delegate :report, to: :page

  before_validation :set_position
  before_update :update_positions, if: :position_changed?

  has_one_attached :screenshot do |attachable|
    attachable.variant :thumbnail, resize_to_limit: [ 200, 200 ]
  end

  scope :failed, -> { where(SuccessCriterion.where(result: SuccessCriterion.results[:failed]).arel.exists) }

  # Calculate actual conformity level:
  # - if a success_criterion has result :failed -> the confirmity_level
  #   of that success_criterion is not reached.
  # - the resulting level is the highest readched level
  #   abeying rule above.
  def level
    return nil
    return nil unless success_criteria.all(&:result)
    element
    min_failed = success_criteria.select(&:failed?).map(&:level).min
    possible_levels = success_criteria.select(&:passed?).map(&:level).uniq

    return nil if possible_levels.empty?

    Rails.logger.debug possible_levels.inspect
    Rails.logger.debug min_failed
    possible_levels[possible_levels.find_index(min_failed) - 1]
  end

  def max_level
    @max_level ||= success_criteria.reject(&:not_applicable?).max(&:level)
  end

  def number
    "#{page.position}.#{position}"
  end

  private
  def set_position
    Rails.logger.debug("element: position #{position}")
    self.position ||= (page.elements.pluck(:position).max || 0) + 1
  end

  def update_positions
    if position_was
      page.elements.where("position > ?", position_was).update_all("position = position - 1")
    end
    page.elements.where(position: position..).update_all("position = position + 1")
  end
end