#!/usr/bin/env node
/**
 * Boot / VFS / shell benchmark harness sketch (append-only trend file).
 * Run manually: `node scripts/benchmark-boot-sketch.mjs`
 * Trend path: `BARE_OS_BENCHMARK_TREND_NDJSON` or `${TMPDIR:-/tmp}/bare-os-benchmark-trend.ndjson`
 */
import { appendFileSync, readFileSync } from 'node:fs'
import process from 'node:process'

function readBootPerfRows() {
  const p =
    String(process.env.BARE_OS_BOOT_PERF_PATH || '').trim() ||
    '/run/bare-os/boot-perf.json'
  try {
    const raw = String(readFileSync(p, 'utf8') || '').trim()
    if (!raw) return { path: p, phases: [] }
    const j = JSON.parse(raw)
    const phases = Array.isArray(j?.phaseSamples)
      ? j.phaseSamples
          .map((x) => ({
            phase: String(x?.phase || ''),
            ms: Number(x?.ms || 0)
          }))
          .filter((x) => x.phase && Number.isFinite(x.ms) && x.ms >= 0)
      : []
    return { path: p, phases }
  } catch {
    return { path: p, phases: [] }
  }
}

const perf = readBootPerfRows()
const totalMs = perf.phases.reduce((a, b) => a + b.ms, 0)
const path =
  String(process.env.BARE_OS_BENCHMARK_TREND_NDJSON || '').trim() ||
  `${process.env.TMPDIR || '/tmp'}/bare-os-benchmark-trend.ndjson`
const line =
  JSON.stringify({
    schema: 2,
    name: 'boot-sketch',
    wallMs: totalMs,
    bootPerfPath: perf.path,
    phaseCount: perf.phases.length,
    phaseTimings: perf.phases,
    atMs: Date.now()
  }) + '\n'
try {
  appendFileSync(path, line)
} catch {
  /* ignore */
}
console.log(
  'benchmark-boot-sketch: ok (trend → ' +
    path +
    ', phases=' +
    perf.phases.length +
    ')'
)
process.exit(0)