module Ecom
  module Core
    class MaterialItem < ApplicationRecord
      before_save :assign_serial_number

      belongs_to :material_identity

      validates :serial_number, presence: true, uniqueness: true
      validates :material_identity_id, :material_identity, presence: true
      validates :serial_number, format: { with: /^SN_\d+$/, message: 'Invalid serial number format', multiline: true }
      validates :price, numericality: { greater_than: 0 }, allow_nil: true

      def assign_serial_number
        self.serial_number = "SN_#{(Time.now.to_f * 1000).to_i}"
      end
    end
  end
end