/**
 * 将存量商品 / SKU 的 sku_code 全部改成 DK + 6 位数字。
 * 已是 DK 数字码的保持不变；其余先写临时码再分配，避免唯一约束冲突。
 *
 * 用法：cd server/dukang-api && npx ts-node prisma/rewrite-sku-codes-dk.ts
 */
import { PrismaClient } from '@prisma/client';

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

function isDk(code: string) {
  return RE.test(code);
}

function formatCode(seq: number) {
  return `${PREFIX}${String(seq).padStart(PAD, '0')}`;
}

async function maxExistingSeq(): Promise<number> {
  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 maxSeq;
}

async function main() {
  const skus = await prisma.commonProductSku.findMany({
    orderBy: [{ productId: 'asc' }, { id: 'asc' }],
    select: { id: true, productId: true, skuCode: true, isDefault: true },
  });
  const products = await prisma.commonProductItem.findMany({
    select: { id: true, skuCode: true },
  });

  const skuNeed = skus.filter((s) => !isDk(s.skuCode));
  const productNeed = products.filter((p) => !isDk(p.skuCode));
  console.log(`sku total=${skus.length} rewrite=${skuNeed.length}`);
  console.log(`product total=${products.length} rewrite=${productNeed.length}`);

  await prisma.$transaction(async (tx) => {
    for (const s of skuNeed) {
      await tx.commonProductSku.update({
        where: { id: s.id },
        data: { skuCode: `TMP${s.id.toString()}` },
      });
    }
    for (const p of productNeed) {
      await tx.commonProductItem.update({
        where: { id: p.id },
        data: { skuCode: `TMPP${p.id.toString()}` },
      });
    }

    const seqStart = await (async () => {
      const [items, skuRows] = await Promise.all([
        tx.commonProductItem.findMany({
          where: { skuCode: { startsWith: PREFIX } },
          select: { skuCode: true },
        }),
        tx.commonProductSku.findMany({
          where: { skuCode: { startsWith: PREFIX } },
          select: { skuCode: true },
        }),
      ]);
      let maxSeq = 0;
      for (const row of [...items, ...skuRows]) {
        const m = RE.exec(row.skuCode);
        if (!m) continue;
        const n = Number(m[1]);
        if (Number.isFinite(n) && n > maxSeq) maxSeq = n;
      }
      return maxSeq;
    })();

    let seq = seqStart;
    const defaultSkuCodeByProduct = new Map<string, string>();

    for (const s of skuNeed) {
      seq += 1;
      const code = formatCode(seq);
      await tx.commonProductSku.update({
        where: { id: s.id },
        data: { skuCode: code },
      });
      if (s.isDefault) defaultSkuCodeByProduct.set(s.productId.toString(), code);
      console.log(`sku ${s.id} ${s.skuCode} -> ${code}`);
    }

    for (const p of productNeed) {
      const fromDefault = defaultSkuCodeByProduct.get(p.id.toString());
      let code = fromDefault;
      if (!code) {
        seq += 1;
        code = formatCode(seq);
      }
      await tx.commonProductItem.update({
        where: { id: p.id },
        data: { skuCode: code },
      });
      console.log(`product ${p.id} ${p.skuCode} -> ${code}`);
    }

    const stillDefault = await tx.commonProductSku.findMany({
      where: { isDefault: true },
      select: { productId: true, skuCode: true },
    });
    for (const s of stillDefault) {
      if (!isDk(s.skuCode)) continue;
      await tx.commonProductItem.updateMany({
        where: { id: s.productId, NOT: { skuCode: s.skuCode } },
        data: { skuCode: s.skuCode },
      });
    }
  });

  const leftoverSku = await prisma.commonProductSku.count({
    where: { NOT: { skuCode: { startsWith: PREFIX } } },
  });
  const leftoverProduct = await prisma.commonProductItem.count({
    where: { NOT: { skuCode: { startsWith: PREFIX } } },
  });
  console.log(`done leftoverSku=${leftoverSku} leftoverProduct=${leftoverProduct} maxWas=${await maxExistingSeq()}`);
}

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