class PromotionCode < ApplicationRecord
  # Validations
  validates :code, presence: true, uniqueness: true
  validates :discount_amount_cents, numericality: { greater_than_or_equal_to: 0 }

  # Scopes
  scope :active, -> { where(active: true) }
  scope :expired, -> { where("expires_at < ? OR active = ?", Time.current, false) }
  scope :valid, -> { active.where("expires_at > ? OR expires_at IS NULL", Time.current) }

  # Callbacks
  before_create :increment_uses_count

  # Associations
  belongs_to :user
  belongs_to :event
  has_many :order_promotion_codes
  has_many :orders, through: :order_promotion_codes

  # Instance methods
  def discount_amount_euros
    discount_amount_cents / 100.0
  end

  def active?
    active && (expires_at.nil? || expires_at > Time.current)
  end

  def expired?
    expires_at.present? && expires_at < Time.current
  end

  def can_be_used?
    active? && (usage_limit.nil? || uses_count < usage_limit)
  end

  private

  def increment_uses_count
    self.uses_count ||= 0
  end
end