'use strict';

const express = require('express');
const multer = require('multer');
const {
  clearPickBins,
  getPickBinMeta,
  getReplenishExportRows,
  getReplenishList,
  importPickBins,
  resolveWarehouseKey,
} = require('../services/binReplenishService');
const { sendWorkbookDownload } = require('../services/exportWorkbook');

const router = express.Router();
const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 20 * 1024 * 1024 },
});

const EXPORT_COLUMNS = [
  { key: 'skuId', title: '商品编码' },
  { key: 'productName', title: '品名' },
  { key: 'supplier', title: '供应商' },
  { key: 'statusLabel', title: '状态' },
  { key: 'pickQty', title: '拣货位库存' },
  { key: 'storageQty', title: '存货位库存' },
  { key: 'totalQty', title: '现有库存合计' },
  { key: 'targetQty', title: '目标拣货位库存' },
  { key: 'suggestQty', title: '建议补货量' },
  { key: 'avgSale', title: '近15天日销' },
  { key: 'pickBinText', title: '拣货位（货位号/数量）' },
  { key: 'storageBinText', title: '存货位（前5个/数量）' },
];

/** GET /api/bin-replenish/list —— 缺货补货监控列表 */
router.get('/list', async (req, res, next) => {
  try {
    const payload = await getReplenishList({
      warehouse: req.query.warehouse,
      keyword: req.query.keyword,
      status: req.query.status,
      page: req.query.page,
      pageSize: req.query.pageSize,
      targetDays: req.query.targetDays,
      refresh: req.query.refresh,
    });
    res.json({ success: true, data: payload });
  } catch (error) {
    next(error);
  }
});

/** GET /api/bin-replenish/export —— 服务端全量导出 */
router.get('/export', async (req, res, next) => {
  try {
    const format = String(req.query.format || 'xlsx').toLowerCase() === 'csv' ? 'csv' : 'xlsx';
    const payload = await getReplenishExportRows({
      warehouse: req.query.warehouse,
      keyword: req.query.keyword,
      status: req.query.status,
      targetDays: req.query.targetDays,
    });
    const rows = payload.rows.map((row) => ({
      ...row,
      pickBinText: (row.pickBins || []).map((item) => `${item.bin}(${item.qty})`).join('、'),
      storageBinText: (row.storageBins || []).map((item) => `${item.bin}(${item.qty})`).join('、'),
    }));

    sendWorkbookDownload(res, {
      fileName: `${payload.warehouse.shortName}缺货补货监控_${new Date().toISOString().slice(0, 10)}`,
      format,
      sheets: [{
        name: '缺货补货监控',
        header: EXPORT_COLUMNS.map((column) => column.title),
        rows: rows.map((row) => EXPORT_COLUMNS.map((column) => row[column.key])),
      }],
    });
  } catch (error) {
    next(error);
  }
});

/** GET /api/bin-replenish/pick-bins —— 当前仓库的拣货位清单概况 */
router.get('/pick-bins', async (req, res, next) => {
  try {
    const meta = await getPickBinMeta(resolveWarehouseKey(req.query.warehouse));
    res.json({ success: true, data: meta });
  } catch (error) {
    next(error);
  }
});

/** POST /api/bin-replenish/pick-bins —— 导入拣货位清单（xlsx / xls / csv / txt） */
router.post('/pick-bins', upload.single('file'), async (req, res, next) => {
  try {
    if (!req.file || !req.file.buffer) {
      res.status(400).json({ success: false, message: '请选择要导入的货位清单文件（xlsx / xls / csv）' });
      return;
    }
    // multer 按 latin1 解析 multipart 文件名，中文会乱码，这里转回 UTF-8
    const rawName = req.file.originalname || '';
    const fileName = /[\u00c0-\u00ff]/.test(rawName)
      ? Buffer.from(rawName, 'latin1').toString('utf8')
      : rawName;

    const result = await importPickBins({
      buffer: req.file.buffer,
      fileName,
      warehouseKey: req.body?.warehouse || req.query.warehouse,
      importedBy: req.user?.username || req.user?.name || null,
    });
    res.json({ success: true, data: result });
  } catch (error) {
    next(error);
  }
});

/** DELETE /api/bin-replenish/pick-bins —— 清除货位清单，回到回退口径 */
router.delete('/pick-bins', async (req, res, next) => {
  try {
    const result = await clearPickBins(req.query.warehouse);
    res.json({ success: true, data: result });
  } catch (error) {
    next(error);
  }
});

/** GET /api/bin-replenish/ping —— 路由存活探针（401 也代表已注册） */
router.get('/ping', (req, res) => {
  res.json({ success: true, data: { ok: true } });
});

module.exports = router;