// Gate: so kết quả test hiện tại với baseline kết quả đã commit.
// PASS nếu KHÔNG có test nào pass(baseline) → fail(now). Test mới được phép.
// Usage: node tests/__baseline__/verify-no-regression.mjs <current-results.json>
import { readFileSync } from "fs";

const resultsPath = process.argv[2];
if (!resultsPath) { console.error("Missing results.json path"); process.exit(2); }

const r = JSON.parse(readFileSync(resultsPath, "utf8"));
const normalizeTestPath = (filePath) => {
  const normalized = String(filePath || "").replaceAll("\\", "/");
  const testsIndex = normalized.lastIndexOf("/tests/");
  return testsIndex >= 0 ? normalized.slice(testsIndex + 1) : normalized;
};
const assertionStatuses = (results) => new Map(results.testResults.flatMap(f =>
  f.assertionResults.map(a => [normalizeTestPath(f.name) + " :: " + a.fullName, a.status])
));

const baseline = JSON.parse(readFileSync(new URL("./baseline-results.json", import.meta.url), "utf8"));
const baselineStatuses = assertionStatuses(baseline);
const nowFails = r.testResults.flatMap(f =>
  f.assertionResults.filter(a => a.status === "failed")
    .map(a => normalizeTestPath(f.name) + " :: " + a.fullName)
);

// Regression = test từng pass trong baseline nhưng fail bây giờ.
const regressions = nowFails.filter(name => baselineStatuses.get(name) === "passed");

if (regressions.length) {
  console.error(`\n❌ REGRESSION: ${regressions.length} test pass→fail:\n`);
  regressions.forEach(f => console.error("  - " + f));
  process.exit(1);
}
console.log(`✅ No regression. (now fails=${nowFails.length}, baseline assertions=${baselineStatuses.size})`);