class Ingredient < ActiveRecord::Base
  enum group: {
    other: 0,
    meat: 1
  }

  belongs_to :project, required: true
  belongs_to :ref_unit, class_name: 'Unit', required: true

  has_many :nutrients, inverse_of: :ingredient, dependent: :destroy, validate: true
  validates :nutrients, presence: true
  accepts_nested_attributes_for :nutrients, allow_destroy: true, reject_if: proc { |attrs|
    attrs['quantity_id'].blank? && attrs['amount'].blank?
  }
  # Nutrient quantity_id uniqueness check for nested attributes
  validate do
    quantities = self.nutrients.map { |n| n.quantity_id }
    if quantities.length != quantities.uniq.length
      errors.add(:nutrients, :duplicated_quantity)
    end
  end

  validates :name, presence: true, uniqueness: {scope: :project_id}
  validates :ref_amount, numericality: {greater_than: 0}
  validates :group, inclusion: {in: groups.keys}

  after_initialize do
    if new_record?
      self.ref_amount ||= 100
      units = self.project.units
      self.ref_unit ||= units.find_by(shortname: 'g') || units.first
      self.group ||= :other
      self.hidden = false if self.hidden.nil?
    end
  end

end