/**
 * v3.5.4：为尚无 SKU 的商品回填默认 SKU（与 migrate-product-sku-v354.sql 一致）
 * 用法：cd server/dukang-api && npx ts-node prisma/backfill-product-skus.ts
 */
import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();
const PREFIX = 'DK';
const PAD = 6;
const RE = /^DK(\d+)$/;

async function nextDkCode() {
  const [items, skus] = await Promise.all([
    prisma.commonProductItem.findMany({
      where: { skuCode: { startsWith: PREFIX } },
      select: { skuCode: true },
    }),
    prisma.commonProductSku.findMany({
      where: { skuCode: { startsWith: PREFIX } },
      select: { skuCode: true },
    }),
  ]);
  let maxSeq = 0;
  for (const row of [...items, ...skus]) {
    const m = RE.exec(row.skuCode);
    if (!m) continue;
    const n = Number(m[1]);
    if (Number.isFinite(n) && n > maxSeq) maxSeq = n;
  }
  return `${PREFIX}${String(maxSeq + 1).padStart(PAD, '0')}`;
}

async function main() {
  const products = await prisma.commonProductItem.findMany({
    include: { skus: { select: { id: true }, take: 1 } },
  });
  let created = 0;
  for (const p of products) {
    if (p.skus.length > 0) continue;
    const skuCode = RE.test(p.skuCode) ? p.skuCode : await nextDkCode();
    await prisma.commonProductSku.create({
      data: {
        productId: p.id,
        skuCode,
        barcode69: p.barcode69,
        specKey: '',
        specText: p.spec,
        price: p.price,
        benefitAmount: p.benefitAmount,
        status: p.status,
        allowOnSitePickup: p.allowOnSitePickup,
        allowOnlinePurchase: p.allowOnlinePurchase,
        allowCrossCityDelivery: p.allowCrossCityDelivery,
        saleUnit: 'BOTTLE',
        bottlesPerUnit: 1,
        isDefault: true,
        sortOrder: 0,
      },
    });
    if (p.skuCode !== skuCode) {
      await prisma.commonProductItem.update({
        where: { id: p.id },
        data: { skuCode },
      });
    }
    created += 1;
    console.log(`created default sku for product ${p.id} ${skuCode}`);
  }
  console.log(`done, created=${created}, scanned=${products.length}`);
}

main()
  .catch((e) => {
    console.error(e);
    process.exit(1);
  })
  .finally(() => prisma.$disconnect());