'use strict';
// routes/notifications.js — aggregates "pending on me" items across the
// workflows that already have clear, per-user pending logic (Work Order,
// Production Order, Batch Issuance, BOM Requests, Production Deviations,
// and — admin only — Password Reset requests), for the sidebar bell +
// dashboard "Pending Actions" widget. Every item is gated by the same
// approval-step/role check its own workflow route enforces, so a user only
// ever sees what they're actually permitted to act on. Other approval
// workflows (Purchase Requests, Customer/Vendor registration, Project
// approvals, etc.) aren't included yet.
const express = require('express');
const router  = express.Router();
const { verifyToken, hasStepPerm, hasStepAssigned } = require('../middleware/auth');
const appSettings = require('../services/appSettingsStore');

// Mirrors routes/workOrders.js's WORK_ORDER_STEP_KEYS (index-aligned with
// services/workOrderStore.js's STEPS) — duplicated here rather than
// exported, matching how work-order.html itself already keeps its own copy.
const WO_STEP_KEYS = ['prepared_qa', 'checked_qc', 'checked_production', 'checked_mgr_production', 'approved_mgr_qa'];
const WO_STEPS     = ['Prepared By QA', 'Checked By QC', 'Checked By Store In-Charge', 'Checked By (Manager Production)', 'Approved By (Manager QA)'];

// Mirrors server.js's /api/config approvalMap for BOM Requests — which
// ROLE is on turn for a given status, at the admin-configured BOM levels
// (Settings → bomApprovalLevels; see services/appSettingsStore.js).
function bomApprovalMap() {
  const levels = appSettings.bomApprovalLevels();
  return {
    2: { PENDING: 'manager', L1_APPROVED: 'sap_adder' },
    3: { PENDING: 'manager', L1_APPROVED: 'sr_manager', L2_APPROVED: 'sap_adder' },
    4: { PENDING: 'manager', L1_APPROVED: 'sr_manager', L2_APPROVED: 'sap_adder', L3_APPROVED: 'sap_adder' },
  }[levels] || {};
}

router.get('/pending', verifyToken, async (req, res) => {
  const user = req.user;
  const items = [];

  try {
    const wos = await require('../services/workOrderStore').listWorkOrders({ status: 'IN_PROGRESS' });
    wos.forEach(w => {
      const key = WO_STEP_KEYS[w.stage];
      if (key && hasStepPerm(user, `work_order:${key}`, 'approve')) {
        items.push({
          module: 'work_order', label: 'Work Order', title: w.woNo,
          detail: `${WO_STEPS[w.stage]} — ${w.productName || w.productCode || ''}`,
          link: `/work-order?open=${w.id}`, id: w.id, cardHref: '/work-order',
        });
      }
    });
  } catch (e) { console.warn('[notifications] work order scan failed:', e.message); }

  try {
    const poStore = require('../services/productionOrderStore');
    // Which standalone page each stage's action actually happens on —
    // Issue/Receipt/Close each have their own dedicated page (deep-linked
    // via #order=<AbsoluteEntry>&company=<co>, same hash convention
    // production.html's own action buttons already use to get there).
    // Release and Transfer to Finished Goods have no standalone page of
    // their own — those stay on production.html's detail popup.
    const STAGE_CARD_HREF = { release: '/production', issuance: '/issue-production', receipt: '/receipt-production', transfer_fg: '/production', close: '/close-production' };
    // Consumable Orders (Release → Issue → Close only, no Receipt/Transfer to
    // FG) are gated by their OWN dedicated steps, never the general
    // production_order:* ones — mirrors services/productionOrderStore.js's
    // own notifyStepFor()/CONSUMABLE_STEP_FOR (not exported, so duplicated
    // here, same convention as WORK_ORDER_STEP_KEYS above). Without this, a
    // user holding the general 'production_order:release' step (but NOT
    // 'production_order:consumable_release') incorrectly saw every pending
    // Consumable Order in the bell too, even though the Production Order
    // page itself already correctly hides Consumable Orders from them.
    const CONSUMABLE_STEP_FOR = { release: 'consumable_release', issuance: 'consumable_issue', close: 'consumable_close' };
    const pos = await poStore.listProductionOrders({ status: 'IN_PROGRESS' });
    // REJECTED orders (receipt posted with rejection lines) still need to be
    // CLOSED — surface them to the close-step users too.
    const rejected = await poStore.listProductionOrders({ status: 'REJECTED' });
    rejected.forEach(p => { pos.push(Object.assign({}, p, { stage: 4 })); });   // stage 4 = Close
    pos.forEach(p => {
      const generalKey = poStore.STEP_KEYS[p.stage];
      const key = p.isConsumable ? (CONSUMABLE_STEP_FOR[generalKey] || null) : generalKey;
      // Same rule as the Issue/Receipt/Close pages themselves: being ASSIGNED
      // the step (any perm — view/add/edit/approve) means the action is yours,
      // so it must show in the bell too. (Was 'approve'-only, which hid e.g.
      // pending Receipts from users holding view/add/edit.)
      if (key && hasStepAssigned(user, `production_order:${key}`)) {
        const cardHref = STAGE_CARD_HREF[key] || '/production';
        const link = p.sapAbsEntry
          ? (cardHref === '/production'
              ? `/production?open=${p.sapAbsEntry}`
              : `${cardHref}#order=${p.sapAbsEntry}&company=${encodeURIComponent(p.company || '')}`)
          : '/production';
        items.push({
          module: 'production_order', label: 'Production Order', title: p.sapDocNum ? `#${p.sapDocNum}` : `Item ${p.itemCode}`,
          detail: `${poStore.STEPS[p.stage]} — ${p.itemName || p.itemCode || ''}`,
          link, id: p.id, cardHref,
        });
      }
    });
  } catch (e) { console.warn('[notifications] production order scan failed:', e.message); }

  // Batch Issuance intimations awaiting a Work Order — pending for whoever
  // holds the "Prepared By QA" (create Work Order) step, same 'add' perm the
  // WO create route itself requires. An intimation counts as pending until
  // some Work Order references it (ZWORK_ORDERS.INTIMATION_ID).
  try {
    if (hasStepPerm(user, 'work_order:prepared_qa', 'add')) {
      const ints = await require('../services/batchIntimationStore').listIntimations({ status: 'SENT_TO_QA' });
      const wos  = await require('../services/workOrderStore').listWorkOrders({});
      const used = new Set(wos.filter(w => w.intimationId).map(w => String(w.intimationId)));
      ints.forEach(bi => {
        if (used.has(String(bi.id))) return;
        const firstProd = Array.isArray(bi.products) && bi.products[0]
          ? (bi.products[0].productName || bi.products[0].name || bi.products[0].productCode || '') : '';
        items.push({
          module: 'batch_issuance', label: 'Batch Issuance', title: bi.docNo || ('#' + bi.id),
          detail: `${firstProd ? firstProd + ' — ' : ''}awaiting Work Order`,
          link: '/work-order', id: bi.id, cardHref: '/batch-issuance',
        });
      });
    }
  } catch (e) { console.warn('[notifications] batch issuance scan failed:', e.message); }

  try {
    const boms = await require('../services/bomRequestStore').listRequests({ status: 'ALL' });
    const map = bomApprovalMap();
    boms.forEach(b => {
      const turnRole = map[b.status];
      if (turnRole && turnRole === user.role) {
        items.push({
          module: 'bom', label: 'BOM Request', title: b.itemCode,
          detail: `${b.itemName || ''} — awaiting your review`,
          link: `/approvals?open=${b.id}`, id: b.id, cardHref: '/bom',
        });
      }
    });
  } catch (e) { console.warn('[notifications] bom scan failed:', e.message); }

  // Production Deviations awaiting QA sign-off — pending for whoever holds
  // 'approve' on production_order:deviation (see [[production-deviation-workflow]]).
  // Only QA_STATUS='PENDING' counts as pending; N_A (QA not required for this
  // one) / APPROVED / REJECTED are already resolved, nothing left to do.
  try {
    if (hasStepPerm(user, 'production_order:deviation', 'approve')) {
      const devs = await require('../services/deviationStore').listDeviations({});
      devs.filter(d => d.qaStatus === 'PENDING').forEach(d => {
        items.push({
          module: 'deviation', label: 'Deviation', title: d.sapDocNum ? `PWO #${d.sapDocNum}` : `Item ${d.itemCode}`,
          detail: `${d.type.charAt(0) + d.type.slice(1).toLowerCase()} — ${d.itemCode}${d.newItemCode ? ' → ' + d.newItemCode : ''} — awaiting QA`,
          link: d.sapAbsEntry ? `/production?open=${d.sapAbsEntry}` : '/deviations', id: d.id, cardHref: '/deviations',
        });
      });
    }
  } catch (e) { console.warn('[notifications] deviation scan failed:', e.message); }

  if (user.role === 'admin' || user.role === 'sap_adder') {
    try {
      const pending = await require('../services/passwordResetStore').listRequests('PENDING');
      pending.forEach(r => {
        items.push({
          module: 'password_reset', label: 'Password Reset', title: '@' + r.username,
          detail: r.note || 'Requested a password reset',
          link: `/admin?tab=pwresets&open=${r.id}`, id: r.id, cardHref: '/admin',
        });
      });
    } catch (e) { console.warn('[notifications] password reset scan failed:', e.message); }
  }

  res.json({ success: true, count: items.length, data: items });
});

module.exports = router;