Keep the order. Lose the chaos.

import { normalizePkPhone, isValidPkMobile, isCityServiceable } from '@storecha/contracts'

export function validateCustomerAddress(input: {
  phone: string
  city: string
  landmark: string
}) {
  const phone = normalizePkPhone(input.phone) // converts +92300..., 0300-..., 92300... -> "03001234567"

  if (!isValidPkMobile(phone)) {
    throw new Error('Enter a valid Pakistani mobile number (03XX-XXXXXXX).')
  }

  if (!input.landmark?.trim()) {
    throw new Error('Nearest Landmark is required for Pakistani courier delivery.')
  }

  if (!isCityServiceable(input.city)) {
    throw new Error(`COD is currently unserviceable in ${input.city}.`)
  }

  return { phone, city: input.city, landmark: input.landmark }
}