#!/usr/bin/env node
// Rebuild bench/runs/index.json from the run files. Parallel agents must not
// read-modify-write a shared index; they write their own run file and the
// index is regenerated here (the batch runner calls this periodically).
import { existsSync, readdirSync, readFileSync, writeFileSync } from 'node:fs';
import { resolve } from 'node:path';

export function rebuildIndex(dir = resolve('bench/runs')) {
  if (!existsSync(dir)) return [];
  const index = [];
  for (const f of readdirSync(dir)) {
    if (!f.endsWith('.json') || f === 'index.json') continue;
    try {
      const r = JSON.parse(readFileSync(resolve(dir, f), 'utf8'));
      index.push({ run: r.run, level: r.level.id, persona: r.persona, model: r.model, peek: r.peek, status: r.status, steps: r.steps.length, updatedAt: r.updatedAt });
    } catch { /* a file being written right now; next rebuild picks it up */ }
  }
  index.sort((a, b) => (b.updatedAt || '').localeCompare(a.updatedAt || ''));
  writeFileSync(resolve(dir, 'index.json'), JSON.stringify(index, null, 1));
  return index;
}

if (process.argv[1] && process.argv[1].endsWith('bench-index.mjs')) {
  const index = rebuildIndex();
  console.log(`index.json · ${index.length} 局`);
}