/**
 * 从 PDD 纯数字内部 SKU 的订单项回填中文映射（只读扫描 + 幂等写入）。
 *
 * 只处理 sku_name 含中文、sku_code 为纯数字的情况；
 * 找不到中文名的纯数字码会列出来，等运营补映射。
 *
 * 用法：npx tsx scripts/backfill-internal-sku-mappings.ts [--apply]
 */
import { closeDb, query } from '../src/db/client.js'
import { upsertInternalSkuMapping } from '../src/services/fulfillment/internal-sku-mapping-service.js'

async function main() {
  const apply = process.argv.includes('--apply')
  const rows = await query<{
    provider: string
    shop_id: string
    sku_code: string
    sku_name: string
    total: number
  }>(
    `
      SELECT o.provider, o.shop_id, oi.sku_code, MIN(oi.sku_name) AS sku_name, count(*)::int AS total
      FROM order_items oi
      JOIN orders o ON o.id = oi.order_id
      WHERE btrim(COALESCE(oi.manual_sku_key, '')) ~ '^[0-9]+$'
        AND btrim(COALESCE(oi.sku_name, '')) ~ '[一-龥]'
      GROUP BY 1, 2, 3
      ORDER BY 5 DESC
    `,
  )
  const unresolved = await query<{
    provider: string
    shop_id: string
    sku_code: string
    total: number
  }>(
    `
      SELECT o.provider, o.shop_id, oi.sku_code, count(*)::int AS total
      FROM order_items oi
      JOIN orders o ON o.id = oi.order_id
      WHERE btrim(COALESCE(oi.manual_sku_key, '')) ~ '^[0-9]+$'
        AND btrim(COALESCE(oi.sku_name, '')) !~ '[一-龥]'
      GROUP BY 1, 2, 3
      ORDER BY 4 DESC
    `,
  )

  let written = 0
  for (const row of rows.rows) {
    if (apply) {
      await upsertInternalSkuMapping({
        provider: row.provider,
        shopId: row.shop_id,
        matchType: 'sku_code',
        matchValue: row.sku_code,
        internalSku: row.sku_name,
        priority: 100,
        source: 'backfill',
        note: `从 ${row.total} 条订单项回填`,
      })
    }
    if (apply) written += 1
  }

  console.log(
    JSON.stringify(
      {
        apply,
        canBackfill: rows.rows.length,
        backfilled: written,
        unresolved: unresolved.rows,
      },
      null,
      2,
    ),
  )
}

main()
  .catch((error) => {
    console.error(error)
    process.exitCode = 1
  })
  .finally(() => closeDb())