// 大货库存监控 - 出入库流水取数（本月 1 日 ~ 快照日）
//
// 业务库 JSReportReplica 里与「库存流水」相关的单据表：
//   采购进仓  rpt.jst_purchase        (wms_co_id, po_date, status)  + rpt.jst_purchaseItem      (po_id, inQty)
//   采购退货  rpt.jst_purchaseout     (wms_co_id, io_date, status)  + rpt.jst_purchaseoutItem   (io_id, qty)
//   销售出仓  rpt.jst_salesOutboundInfo(wms_co_id, io_date, status) + rpt.jst_OrderItem          (o_id, qty)
//   销售退货  rpt.jst_returnAndRefundInfo(warehouse 名称)           + rpt.jst_returnAndRefundItem(as_id, r_qty)
//
// 有效单据状态：只统计 Confirmed / Finished，排除 Cancelled / Delete / WaitConfirm。
// 业务库中不存在加工、盘点、调拨、其它出库任何单据表，这 6 列无法取数。
const cloudDb = require('../config/cloudDatabase');

// 单据有效状态（已确认/已完成），避免把取消单算进流水
const PURCHASE_STATUS = "'Confirmed','Finished'";
const PURCHASEOUT_STATUS = "'Confirmed'";
const SALESOUT_STATUS = "'Confirmed'";
const REFUND_STATUS = "'Confirmed'";

function toNumber(value) {
  if (value == null) return null;
  const n = Number(value);
  return Number.isFinite(n) ? n : null;
}

/**
 * 采购进仓：采购单已入库数量（inQty）
 */
async function fetchPurchaseIn(wmsCoId, periodStart, periodEnd) {
  const rows = await cloudDb.query(
    `SELECT ISNULL(SUM(CAST(pi.inQty AS DECIMAL(18, 2))), 0) AS v
       FROM rpt.jst_purchase p
       JOIN rpt.jst_purchaseItem pi ON pi.po_id = p.po_id
      WHERE p.wms_co_id = @wmsCoId
        AND p.po_date >= @periodStart AND p.po_date < @periodEnd
        AND p.status IN (${PURCHASE_STATUS})`,
    { wmsCoId, periodStart, periodEnd }
  );
  return toNumber(rows[0]?.v);
}

/**
 * 采购退货：采购退货出库单数量
 */
async function fetchPurchaseReturn(wmsCoId, periodStart, periodEnd) {
  const rows = await cloudDb.query(
    `SELECT ISNULL(SUM(CAST(oi.qty AS DECIMAL(18, 2))), 0) AS v
       FROM rpt.jst_purchaseout o
       JOIN rpt.jst_purchaseoutItem oi ON oi.io_id = o.io_id
      WHERE o.wms_co_id = @wmsCoId
        AND o.io_date >= @periodStart AND o.io_date < @periodEnd
        AND o.status IN (${PURCHASEOUT_STATUS})`,
    { wmsCoId, periodStart, periodEnd }
  );
  return toNumber(rows[0]?.v);
}

/**
 * 销售出仓：销售出库单关联的订单明细数量
 * 注意：jst_salesOutboundInfo.qty 是表头字段且恒为 0，真实件数在 jst_OrderItem.qty
 */
async function fetchSalesOut(wmsCoId, periodStart, periodEnd) {
  const rows = await cloudDb.query(
    `SELECT ISNULL(SUM(CAST(oi.qty AS DECIMAL(18, 2))), 0) AS v
       FROM rpt.jst_salesOutboundInfo s
       JOIN rpt.jst_OrderItem oi ON oi.o_id = s.o_id
      WHERE s.wms_co_id = @wmsCoId
        AND s.io_date >= @periodStart AND s.io_date < @periodEnd
        AND s.status IN (${SALESOUT_STATUS})`,
    { wmsCoId, periodStart, periodEnd }
  );
  return toNumber(rows[0]?.v);
}

/**
 * 销售退货：退货退款单明细的实退数量（r_qty）
 * 该表 wms_co_id 大量为空（9 月 92821 单中 75094 单为空），改用 warehouse 名称匹配：
 * 名称形如「简尚-崔桥工厂仓销退仓」/「简尚-分销部睢宁专用仓主仓」，统一去掉「销退仓」「主仓」后比对。
 */
async function fetchSalesReturn(dbWarehouse, periodStart, periodEnd) {
  if (!dbWarehouse) return null;
  const rows = await cloudDb.query(
    `SELECT ISNULL(SUM(CAST(ri.r_qty AS DECIMAL(18, 2))), 0) AS v
       FROM rpt.jst_returnAndRefundInfo r
       JOIN rpt.jst_returnAndRefundItem ri ON ri.as_id = r.as_id
      WHERE REPLACE(REPLACE(ISNULL(r.warehouse, ''), N'销退仓', N''), N'主仓', N'') = @whName
        AND r.created >= @periodStart AND r.created < @periodEnd
        AND r.status IN (${REFUND_STATUS})`,
    { whName: dbWarehouse, periodStart, periodEnd }
  );
  return toNumber(rows[0]?.v);
}

/**
 * 仓库实物库存：聚水潭实时库存表 rpt.jst_inventoryInfo（按 wms_co_id 单仓统计）
 * 这是报表「期末数量」的取数口径 —— pm_stockMonitor 的 warehouse 仅是归属仓，
 * 其 jsStock 含已调拨到外仓的货，不能代表本仓实物库存。
 */
async function fetchInventoryQty(wmsCoId) {
  if (!wmsCoId) return null;
  const rows = await cloudDb.query(
    `SELECT ISNULL(SUM(CAST(qty AS DECIMAL(18, 2))), 0) AS v,
            COUNT(CASE WHEN ISNULL(qty, 0) <> 0 THEN 1 END) AS skuCount,
            MAX(modified) AS takenAt
       FROM rpt.jst_inventoryInfo
      WHERE wms_co_id = @wmsCoId`,
    { wmsCoId }
  );
  return {
    qty: toNumber(rows[0]?.v),
    skuCount: toNumber(rows[0]?.skuCount) || 0,
    takenAt: rows[0]?.takenAt ? new Date(rows[0].takenAt).toISOString() : null,
  };
}

/**
 * 一次性取全部流水；任一子查询失败不影响其它字段（返回 null 由调用方降级为「—」）
 */
async function fetchFlowSummary({ wmsCoId, dbWarehouse, periodStart, periodEnd }) {
  const [purchaseIn, purchaseReturn, salesOut, salesReturn] = await Promise.all([
    wmsCoId ? fetchPurchaseIn(wmsCoId, periodStart, periodEnd).catch(() => null) : null,
    wmsCoId ? fetchPurchaseReturn(wmsCoId, periodStart, periodEnd).catch(() => null) : null,
    wmsCoId ? fetchSalesOut(wmsCoId, periodStart, periodEnd).catch(() => null) : null,
    fetchSalesReturn(dbWarehouse, periodStart, periodEnd).catch(() => null),
  ]);

  return { purchaseIn, purchaseReturn, salesOut, salesReturn };
}

module.exports = {
  fetchFlowSummary,
  fetchInventoryQty,
};