import 'dotenv/config';
import { loadConfig } from '../src/config/env.js';
import { ParseRestClient } from '../src/db/parse-rest.client.js';
import { VOC_PARSE_CLASSES } from '../src/db/parse-rest.schema.js';

type Row = Record<string, unknown> & { objectId: string };

const apply = process.argv.includes('--apply');
const overwrite = process.argv.includes('--overwrite');
const workspaceId = process.env.SAAS_DEFAULT_WORKSPACE_ID || 'demashi';
const config = loadConfig();
const client = new ParseRestClient({
  serverUrl: config.parse.serverUrl,
  appId: config.parse.appId,
  masterKey: config.parse.masterKey,
  timeoutMs: config.parse.timeoutMs,
});

const [products, sources] = await Promise.all([
  client.findAll<Row>(VOC_PARSE_CLASSES.product, { workspaceId, role: 'own' }),
  client.findAll<Row>(VOC_PARSE_CLASSES.listingSourceSnapshot, { workspaceId, isCurrent: true }),
]);

const sourceBySku = new Map<string, { source: Row; payload: Record<string, unknown>; sku: Record<string, unknown> }>();
for (const source of sources) {
  const payload = record(source.payload);
  for (const sku of list(payload.skus).map(record)) {
    const skuId = text(sku.skuId || sku.id);
    if (skuId) sourceBySku.set(skuId, { source, payload, sku });
  }
}

const updates = products.flatMap((product) => {
  if (!overwrite && product.rawPayload) return [];
  const match = sourceBySku.get(text(product.productId));
  if (!match) return [];
  const { source, payload, sku } = match;
  const imageUrls = list(payload.images).map(record).map((image) => text(image.url)).filter(Boolean);
  const attributes = list(sku.attributes).map(record);
  const saleAttrs = list(sku.saleAttrs).map(record);
  const dimensions = record(payload.dimensions);
  const marketing = record(payload.marketing);
  const sellingPoints = list(marketing.sellingPoints).map(text).filter(Boolean);
  const model = attributeValue(attributes, ['型号', 'model']) || text(product.model);
  const specification = saleAttrs.map((item) => text(item.value || item.attrValues || item.attrValueAlias)).filter(Boolean).join(' / ')
    || model;
  const rawPayload = {
    itemId: text(product.productId),
    skuId: text(product.productId),
    productId: text(product.productId),
    jdProductId: text(payload.productId || source.productId),
    itemName: text(sku.name || product.title || payload.title),
    brandName: text(payload.brand || product.brand),
    model,
    imageurl: imageUrls[0] || '',
    mainImages: imageUrls,
    specName: specification,
    color: attributeValue(attributes, ['颜色', 'color']),
    weight: text(dimensions.weight || dimensions.weightKg),
    length: text(dimensions.length),
    width: text(dimensions.width),
    height: text(dimensions.height),
    shopId: text(payload.shopId),
    skuStatus: text(sku.status || payload.itemStatus),
    sellPoint: sellingPoints.join('；'),
    price: number(sku.price),
    stock: number(sku.stock),
    sourceModifiedAt: text(payload.sourceModifiedAt),
    collectedAt: text(payload.syncedAt || source.updatedAt),
    source: 'jd-sp-api',
  };
  return [{
    objectId: product.objectId,
    body: {
      source: 'jd-sp-api',
      brand: text(payload.brand || product.brand),
      title: text(sku.name || product.title || payload.title),
      model,
      rawPayload,
    },
  }];
});

console.log(JSON.stringify({
  mode: apply ? 'apply' : 'dry-run',
  workspaceId,
  ownProducts: products.length,
  listingSources: sources.length,
  indexedSkus: sourceBySku.size,
  matchedUpdates: updates.length,
  unmatched: products.filter((product) => !sourceBySku.has(text(product.productId))).length,
  skippedExisting: products.filter((product) => Boolean(product.rawPayload) && sourceBySku.has(text(product.productId))).length,
}, null, 2));

if (apply) {
  for (let offset = 0; offset < updates.length; offset += 50) {
    const batch = updates.slice(offset, offset + 50);
    await writeFmodeBatch(batch.map((item) => ({
      method: 'PUT',
      path: `/classes/${VOC_PARSE_CLASSES.product}/${item.objectId}`,
      body: item.body,
    })));
    console.log(`[voc-product-backfill] ${Math.min(offset + batch.length, updates.length)}/${updates.length}`);
  }
}

async function writeFmodeBatch(requests: Array<{ method: 'PUT'; path: string; body: unknown }>): Promise<void> {
  // The managed Fmode mount exposes REST under /backend/{app}/data, while its
  // batch router expects nested paths relative to /data.
  const results = await client.request<Array<{ error?: { code?: number; error?: string } }>>('/batch', {
    method: 'POST',
    body: { requests: requests.map((request) => ({ ...request, path: `/data${request.path}` })) },
  });
  const failure = results.find((result) => result.error)?.error;
  if (failure) throw new Error(`voc_product_batch_${failure.code ?? 'unknown'}:${failure.error ?? 'failed'}`);
}

function record(value: unknown): Record<string, unknown> {
  return value && typeof value === 'object' && !Array.isArray(value) ? value as Record<string, unknown> : {};
}
function list(value: unknown): unknown[] { return Array.isArray(value) ? value : []; }
function text(value: unknown): string { return value === null || value === undefined ? '' : String(value).trim(); }
function number(value: unknown): number | null { const parsed = Number(value); return Number.isFinite(parsed) ? parsed : null; }
function attributeValue(attributes: Record<string, unknown>[], names: string[]): string {
  const expected = names.map((name) => name.toLowerCase());
  for (const attribute of attributes) {
    const name = text(attribute.name || attribute.attrName).toLowerCase();
    if (!expected.some((item) => name.includes(item))) continue;
    const values = list(attribute.values).map((value) => typeof value === 'object' ? text(record(value).attrValue || record(value).value) : text(value)).filter(Boolean);
    if (values.length) return values.join(' / ');
  }
  return '';
}