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

src/routes/parlay.js

@@ -0,0 +1,46 @@
+'use strict';
+
+/**
+ * /api/parlay (Session 28)
+ *
+ * Builder-side parlay math — combined odds, grade, and correlation flags
+ * for a set of user-selected legs. Distinct from the existing parlay
+ * GRADING path (parlayGrader); this is the lightweight, zero-credit
+ * combination used by the live parlay builder.
+ *
+ *   POST /api/parlay/calculate   { legs: [...] } → combined analysis
+ *   POST /api/parlay/suggestions { props, legs?, max? } → suggested combos
+ */
+
+const express = require('express');
+const parlayService = require('../services/parlayService');
+
+const router = express.Router();
+
+const MISSION_HEADER = { 'X-VYNDR-Mission': 'Catch the legs that fight each other' };
+
+router.post('/calculate', (req, res) => {
+  try {
+    const legs = req.body?.legs;
+    const result = parlayService.calculateParlay(legs);
+    return res.set(MISSION_HEADER).json(result);
+  } catch (err) {
+    const status = err.statusCode || 400;
+    return res.status(status).set(MISSION_HEADER).json({ error: err.message });
+  }
+});
+
+router.post('/suggestions', (req, res) => {
+  try {
+    const { props, legs, max } = req.body || {};
+    const suggestions = parlayService.suggestParlays(props || [], {
+      legs: Number(legs) || 3,
+      max: Number(max) || 3,
+    });
+    return res.set(MISSION_HEADER).json({ suggestions });
+  } catch (err) {
+    return res.status(400).set(MISSION_HEADER).json({ error: err.message });
+  }
+});
+
+module.exports = router;