// Results: one JSON per scenario run under /tmp/igneum-harness/results, and one dated bench-log entry with a row per
// scenario (criterion, result, pass or fail). `run.mjs` calls writeBenchLog once at the end of a batch.

import { mkdirSync, writeFileSync, readFileSync, appendFileSync, existsSync } from 'node:fs';
import { ROOT, TMP } from './net.mjs';

export const RESULTS = `${TMP}/results`;

export function saveResult(name, data) {
  mkdirSync(RESULTS, { recursive: true });
  const file = `${RESULTS}/${name}.json`;
  writeFileSync(file, JSON.stringify(data, null, 2));
  return file;
}

export function loadResults(names) {
  const out = {};
  for (const n of names) {
    const f = `${RESULTS}/${n}.json`;
    if (existsSync(f)) out[n] = JSON.parse(readFileSync(f, 'utf8'));
  }
  return out;
}

/// rows: [{ scenario, criterion, result, pass: true|false|null }]
export function benchLogEntry({ date, title, machine, rows, notes = [] }) {
  const lines = [];
  lines.push('', `## ${date}, ${title}`, '');
  lines.push(machine);
  lines.push('');
  lines.push('| Scenario | Criterion (spec) | Measured | Pass |');
  lines.push('|---|---|---|---|');
  for (const r of rows) {
    const pass = r.pass === true ? 'pass' : r.pass === false ? 'FAIL' : 'stub';
    lines.push(`| ${r.scenario} | ${r.criterion} | ${r.result} | ${pass} |`);
  }
  for (const n of notes) { lines.push(''); lines.push(n); }
  return lines.join('\n') + '\n';
}

export function appendBenchLog(text) {
  const f = `${ROOT}docs/bench-log.md`;
  appendFileSync(f, text);
  return f;
}