Dynamic Dashboard with Widget Library

server/routes/dashboard.js

@@ -1,5 +1,7 @@
 const express = require('express');
-const { all, one } = require('../db');
+const { all, now, one, parseJson, run } = require('../db');
+const { bookLedger } = require('../services/books');
+const { runReport } = require('../services/reportEngine');
 
 const router = express.Router();
 
@@ -27,4 +29,45 @@ router.get('/dashboard', (req, res) => {
   res.json({ stats, byCategory, byStatus, upcomingTasks, auditTrail });
 });
 
+// ---- Per-user dashboard layout (the drag-and-drop widget arrangement) --------
+
+router.get('/dashboard/layout', (req, res) => {
+  const row = one('SELECT layout_json FROM dashboard_layouts WHERE user_id = ?', [req.user.id]);
+  res.json({ layout: row ? parseJson(row.layout_json, null) : null });
+});
+
+router.put('/dashboard/layout', (req, res) => {
+  const layout = Array.isArray(req.body.layout) ? req.body.layout : [];
+  run(
+    `INSERT INTO dashboard_layouts (user_id, layout_json, updated_at) VALUES (?, ?, ?)
+     ON CONFLICT(user_id) DO UPDATE SET layout_json = excluded.layout_json, updated_at = excluded.updated_at`,
+    [req.user.id, JSON.stringify(layout), now()]
+  );
+  res.json({ layout });
+});
+
+// ---- Depreciation aggregator for the dashboard charts (one round-trip) -------
+// byBook: YTD + accumulated per enabled depreciation book; byCategory: accumulated by category (primary book).
+router.get('/dashboard/depreciation', (req, res) => {
+  const cid = req.companyId || null;
+  const year = Number(req.query.year) || new Date().getFullYear();
+  const books = all(
+    "SELECT code, is_primary FROM books WHERE (? IS NULL OR entity_id = ?) AND enabled = 1 AND book_type != 'maintenance' ORDER BY is_primary DESC, sort_order, id",
+    [cid, cid]
+  );
+  const byBook = books.map((b) => {
+    const ledger = bookLedger(b.code, year, cid);
+    return { book: b.code, ytd: ledger ? ledger.summary.depreciation : 0, accumulated: ledger ? ledger.summary.accumulated : 0 };
+  });
+  const primary = (books.find((b) => b.is_primary) || books[0] || {}).code || 'GAAP';
+  let byCategory = [];
+  try {
+    byCategory = runReport('depreciation_summary', { book: primary, year, entity_id: cid }).rows
+      .map((r) => ({ category: r.category, accumulated: r.accumulated, depreciation: r.depreciation }));
+  } catch {
+    byCategory = [];
+  }
+  res.json({ year, book: primary, byBook, byCategory });
+});
+
 module.exports = router;