'use strict';

/**
 * GET /api/accuracy (Session 55) — the system's track record.
 *
 * Public, cache-only read of the model's track record. Powers the AccuracyBadge
 * "A-RATED · X% HIT · 30D" pill and the grade-card accuracy line.
 *
 * Truth-Everywhere Part 2 (item 7) — sourced from the CLEAN Postgres ledger
 * aggregate (getAccuracyView: model_value > 0 excludes the degraded
 * projection-0 rows), NOT the Redis outcome log (which still counts them and
 * can't be filtered). Redis is a cache; when a cache can't be filtered, read
 * from truth. NEVER triggers settlement → no API credits spent.
 */

const express = require('express');
const { createRateLimit } = require('../middleware/rateLimit');
const ledgerService = require('../services/ledgerService');

const router = express.Router();
router.use(createRateLimit({ windowMs: 60_000, max: 60 }));

router.get('/', async (req, res) => {
  try {
    const acc = await ledgerService.getAccuracyView({});
    res.set('Cache-Control', 'public, max-age=300');
    return res.json(acc);
  } catch (err) {
    console.error('[accuracy]', err.message);
    return res.status(200).json({ overall: null, sports: {}, min_sample: 20, updated_at: null });
  }
});

module.exports = router;
