export const ORDER_STATUSES = Object.freeze([
  'DRAFT',
  'PENDING_PAYMENT',
  'PAID',
  'IN_PROGRESS',
  'SHIPPED',
  'READY_FOR_PICKUP',
  'DONE',
  'CANCELLED',
])

/**
 * Допустимые переходы статусов, доступные админу.
 * Значение — массив из next-статусов.
 * Для IN_PROGRESS: объект с ключами по deliveryType.
 */
export const ADMIN_ORDER_TRANSITIONS = Object.freeze({
  DRAFT: ['PENDING_PAYMENT', 'CANCELLED'],
  PENDING_PAYMENT: ['PAID', 'CANCELLED'],
  PAID: ['IN_PROGRESS', 'CANCELLED'],
  IN_PROGRESS: Object.freeze({
    delivery: ['SHIPPED', 'CANCELLED'],
    pickup: ['READY_FOR_PICKUP', 'CANCELLED'],
  }),
})

export function getNextAdminStatuses(from, deliveryType) {
  const transition = ADMIN_ORDER_TRANSITIONS[from]
  if (!transition) return []
  if (Array.isArray(transition)) return [...transition]
  return transition[deliveryType] ? [...transition[deliveryType]] : []
}

export function canTransitionAdminOrderStatus(order, next) {
  const from = order.status
  if (from === next) return true
  return getNextAdminStatuses(from, order.deliveryType).includes(next)
}