class Goal < ActiveRecord::Base
  belongs_to :project, required: true
  has_many :targets, -> { order effective_from: :desc }, inverse_of: :goal,
    dependent: :destroy, extend: BodyTracking::ItemsWithQuantities
  has_many :target_exposures, as: :view, dependent: :destroy,
    class_name: 'Exposure', extend: BodyTracking::TogglableExposures
  has_many :quantities, -> { order "lft" }, through: :target_exposures

  accepts_nested_attributes_for :targets, allow_destroy: true,
    reject_if: proc { |attrs| attrs['quantity_id'].blank? }
  validates :target_exposures, presence: true, unless: :is_binding?
  validates :is_binding, uniqueness: {scope: :project_id}, if: :is_binding?
  validates :name, presence: true, uniqueness: {scope: :project_id},
    exclusion: {in: [I18n.t('targets.form.binding_goal')], unless: :is_binding?}

  after_initialize do
    if new_record?
      self.is_binding = false if self.is_binding.nil?
    end
  end
  before_destroy prepend: true do
    !is_binding?
  end
end