'use strict';
// routes/prodDashboard.js — Production Dashboard analytics, open to ANY
// logged-in user (page visibility is controlled by the 'production-dashboard'
// MODULE grant, like every other production page). Read-only aggregates:
//  - SAP:   OWOR (orders), OIGN/IGN1 BaseType=202 (receipts from production)
//  - Local: ZPRODUCTION_ORDERS (portal workflow stages)
const express = require('express');
const router  = express.Router();
const { verifyToken } = require('../middleware/auth');
const { getPool } = require('../services/sqlPool');
const { getPool: getAppPool } = require('../services/appSqlPool');

async function hana(sqlText) {
  const pool = await getPool();
  return (await pool.request().query(sqlText)).recordset || [];
}
async function appq(sqlText) {
  const pool = await getAppPool();
  return (await pool.request().query(sqlText)).recordset || [];
}

// Superseded by the redesigned Production Dashboard (Work Order + Rejection
// Register + OEE) — this SAP OWOR/IGN1-based summary now backs the
// admin-only legacy page (public/production-dashboard-legacy.html) only,
// so it's admin-gated here too rather than relying on the client alone.
router.get('/summary', verifyToken, async (req, res) => {
  if (req.user?.role !== 'admin')
    return res.status(403).json({ success: false, message: 'This legacy dashboard is admin-only.' });
  try {
    const DS = /^\d{4}-\d{2}-\d{2}$/;
    const iso = d => d.toISOString().slice(0, 10);
    let from = DS.test(req.query.from || '') ? req.query.from : null;
    let to   = DS.test(req.query.to   || '') ? req.query.to   : null;
    if (!from || !to) {
      const now = new Date(); to = iso(now);
      const f = new Date(now); f.setMonth(f.getMonth() - 6); from = iso(f);
    }
    const like  = s => String(s || '').replace(/'/g, "''").slice(0, 60).trim();
    const itemQ = like(req.query.itemQ);
    const itemCond = itemQ ? ` AND (T1.ItemCode LIKE '%${itemQ}%' OR T1.Dscription LIKE '%${itemQ}%')` : '';
    const rc = `T0.DocDate>='${from}' AND T0.DocDate<='${to}'`;   // receipts range
    const oc = `PostDate>='${from}' AND PostDate<='${to}'`;       // orders range

    // ── KPIs ─────────────────────────────────────────────────────────────
    const k = (await hana(`SELECT
      (SELECT ISNULL(SUM(T1.Quantity),0) FROM IGN1 T1 JOIN OIGN T0 ON T0.DocEntry=T1.DocEntry WHERE T1.BaseType=202 AND ${rc}) AS outputQty,
      (SELECT COUNT(DISTINCT T0.DocEntry) FROM IGN1 T1 JOIN OIGN T0 ON T0.DocEntry=T1.DocEntry WHERE T1.BaseType=202 AND ${rc}) AS receiptDocs,
      (SELECT COUNT(DISTINCT T1.ItemCode) FROM IGN1 T1 JOIN OIGN T0 ON T0.DocEntry=T1.DocEntry WHERE T1.BaseType=202 AND ${rc}) AS itemsProduced,
      (SELECT COUNT(*) FROM OWOR WHERE ${oc}) AS ordersCreated,
      (SELECT ISNULL(SUM(PlannedQty),0) FROM OWOR WHERE ${oc}) AS plannedQtyCreated,
      (SELECT COUNT(*) FROM OWOR WHERE ${oc} AND Status='L') AS ordersClosed,
      (SELECT COUNT(*) FROM OWOR WHERE Status='P') AS openPlanned,
      (SELECT COUNT(*) FROM OWOR WHERE Status='R') AS openReleased`))[0] || {};

    // ── Monthly production output (receipts from production) ─────────────
    const monthly = await hana(`
      SELECT YEAR(T0.DocDate) y, MONTH(T0.DocDate) m,
             SUM(T1.Quantity) AS qty, COUNT(DISTINCT T0.DocEntry) AS docs
      FROM IGN1 T1 JOIN OIGN T0 ON T0.DocEntry=T1.DocEntry
      WHERE T1.BaseType=202 AND ${rc}
      GROUP BY YEAR(T0.DocDate), MONTH(T0.DocDate)
      ORDER BY y, m`);

    // ── Top produced items in range (searchable) ─────────────────────────
    const topItems = await hana(`
      SELECT TOP ${itemQ ? 12 : 8} T1.ItemCode AS code, MAX(T1.Dscription) AS name, SUM(T1.Quantity) AS qty
      FROM IGN1 T1 JOIN OIGN T0 ON T0.DocEntry=T1.DocEntry
      WHERE T1.BaseType=202 AND ${rc}${itemCond}
      GROUP BY T1.ItemCode ORDER BY qty DESC`);

    // ── Portal workflow funnel (local tracking, point-in-time) ───────────
    const STEPS = ['Release', 'Issuance', 'Receipt from Production', 'Transfer to Finished Goods', 'Close'];
    let stages = STEPS.map((label, i) => ({ stage: i, label, count: 0 }));
    let rejected = 0;
    try {
      const rows = await appq(`SELECT STAGE, STATUS, COUNT(*) n FROM [dbo].[ZPRODUCTION_ORDERS] WHERE IS_DELETED=0 AND STATUS IN ('IN_PROGRESS','REJECTED') GROUP BY STAGE, STATUS`);
      rows.forEach(r => {
        if (r.STATUS === 'REJECTED') rejected += Number(r.n) || 0;
        else if (stages[r.STAGE]) stages[r.STAGE].count = Number(r.n) || 0;
      });
    } catch (e) { console.warn('[PROD-DASH] local stages failed (non-fatal):', e.message); }

    res.json({ success: true, data: {
      from, to,
      kpi: {
        outputQty:        Number(k.outputQty) || 0,
        receiptDocs:      Number(k.receiptDocs) || 0,
        itemsProduced:    Number(k.itemsProduced) || 0,
        ordersCreated:    Number(k.ordersCreated) || 0,
        plannedQtyCreated:Number(k.plannedQtyCreated) || 0,
        ordersClosed:     Number(k.ordersClosed) || 0,
        openPlanned:      Number(k.openPlanned) || 0,
        openReleased:     Number(k.openReleased) || 0,
      },
      monthly:  monthly.map(r => ({ y: r.y, m: r.m, qty: Number(r.qty) || 0, docs: Number(r.docs) || 0 })),
      topItems: topItems.map(r => ({ code: r.code, name: r.name, qty: Number(r.qty) || 0 })),
      stages, rejected,
    }});
  } catch (err) {
    console.error('[PROD-DASH] summary failed:', err.message);
    res.status(500).json({ success: false, message: err.message });
  }
});

module.exports = router;