Session 28: Parlay builder, line movement tracker, book comparison — 3 features, zero credits (1623 tests)

src/routes/lineMovement.js

@@ -0,0 +1,49 @@
+'use strict';
+
+/**
+ * /api/lines (Session 28)
+ *
+ * Read-only views over the line-snapshot history (Redis). Zero credits.
+ *
+ *   GET /api/lines/:sport/movers                       → biggest movers today
+ *   GET /api/lines/:sport/:gameId/:player/:stat        → one prop's history + classification
+ */
+
+const express = require('express');
+const lineSnapshots = require('../services/lineSnapshotService');
+
+const router = express.Router();
+
+const MISSION_HEADER = { 'X-VYNDR-Mission': 'The market confirms the grade' };
+
+const SUPPORTED = new Set(['nba', 'wnba', 'mlb', 'soccer', 'nfl', 'nhl']);
+
+router.get('/:sport/movers', async (req, res) => {
+  const sport = String(req.params.sport || '').toLowerCase();
+  if (!SUPPORTED.has(sport)) {
+    return res.status(404).set(MISSION_HEADER).json({ error: `No line tracking for sport: ${sport}` });
+  }
+  const limit = req.query.limit ? Math.max(0, parseInt(req.query.limit, 10) || 0) : 20;
+  try {
+    const movers = await lineSnapshots.getBiggestMovers(sport, { limit });
+    return res.set(MISSION_HEADER).json({ sport, movers, source: 'snapshots' });
+  } catch (err) {
+    console.error(`[lines/${sport}/movers]`, err.message);
+    return res.set(MISSION_HEADER).json({ sport, movers: [], source: 'snapshots' });
+  }
+});
+
+router.get('/:sport/:gameId/:player/:stat', async (req, res) => {
+  const sport = String(req.params.sport || '').toLowerCase();
+  const { gameId, player, stat } = req.params;
+  try {
+    const history = await lineSnapshots.getLineHistory(sport, gameId, decodeURIComponent(player), stat);
+    const classification = lineSnapshots.classifyMovement(history);
+    return res.set(MISSION_HEADER).json({ sport, gameId, player, stat, ...classification });
+  } catch (err) {
+    console.error(`[lines/${sport}/prop]`, err.message);
+    return res.set(MISSION_HEADER).json({ sport, gameId, player, stat, movement: 'stable', delta: 0, snapshots: [] });
+  }
+});
+
+module.exports = router;