function mapCreateDealRequestToDealCreateData(payload, userId) {
  const {
    title,
    description,
    url,
    price,
    originalPrice,
    sellerName,
    customSeller,
    couponCode,
    location,
    discountType,
    discountValue,
  } = payload

  const normalizedCouponCode =
    couponCode === undefined || couponCode === null
      ? null
      : String(couponCode).trim() || null
  const hasUrl = Boolean(url)
  const saleType = !hasUrl ? "OFFLINE" : normalizedCouponCode ? "CODE" : "ONLINE"

  const hasPrice = price != null
  const normalizedDiscountType = hasPrice ? null : discountType ?? null
  const normalizedDiscountValue = hasPrice ? null : discountValue ?? null
  const normalizedSellerName = sellerName ?? customSeller ?? null

  return {
    title,
    description: description ?? null,
    url: url ?? null,
    price: price ?? null,
    originalPrice: originalPrice ?? null,
    couponCode: normalizedCouponCode,
    location: location ?? null,
    discountType: normalizedDiscountType,
    discountValue: normalizedDiscountValue,
    saletype: saleType,

    // Burada customSeller yazıyoruz; servis gerektiğinde ilişkilendiriyor.
    customSeller: normalizedSellerName,

    user: {
      connect: { id: userId },
    },
  }
}

module.exports = {
  mapCreateDealRequestToDealCreateData,
}