// The page's coverage report, once every test has added its page's (coverage.ts, #390), and its
// lines file by file in summary.json, which scripts/coverage-metrics.ts reads for Grafana (#394).
import fs from 'node:fs';
import path from 'node:path';
import { CoverageReport } from 'monocart-coverage-reports';
import { coverageOptions } from './coverage.ts';

/// Where a coverage run's page unit and native-bridge tests write V8's record of what they ran.
export const NODE_COVERAGE = 'target/coverage/node-v8';

export default async function teardown() {
  if (!process.env.IPX_COVERAGE) return;
  const report = new CoverageReport(coverageOptions);
  // What the page's Node tests ran of it, when the run measured them first (NODE_V8_COVERAGE, #407).
  if (fs.existsSync(NODE_COVERAGE)) await report.addFromDir(NODE_COVERAGE);
  const results = await report.generate();
  if (!results) return;
  const lines = results.files.map((f) => ({ file: f.sourcePath, covered: f.summary.lines.covered, total: f.summary.lines.total }));
  fs.writeFileSync(path.join(coverageOptions.outputDir!, 'summary.json'), JSON.stringify({ lines }, null, 2));
}