#!/usr/bin/env node
/**
 * Fail if `kernel/` and `packages/bare-os-seeder/kernel/` differ.
 * Compares the **entire** recursive file set (relative paths + byte contents), not only `init.js`.
 * Run after coreutils build so `bin/*` and `share/man/man.json` match when both trees were refreshed.
 */

import fs from 'node:fs'
import path from 'node:path'
import process from 'node:process'
import { fileURLToPath } from 'node:url'
import { assertKernelInitJsMatchesRecipe } from './lib/kernel-init-bundle.mjs'

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
const canonical = path.join(root, 'kernel')
const vendored = path.join(root, 'packages/bare-os-seeder/kernel')

function walkFiles(dir, base) {
  /** @type {string[]} */
  const out = []
  if (!fs.existsSync(dir)) {
    throw new Error(`Missing directory: ${dir}`)
  }
  for (const ent of fs.readdirSync(dir, { withFileTypes: true })) {
    const p = path.join(dir, ent.name)
    const rel = path.relative(base, p)
    if (ent.isDirectory()) {
      out.push(...walkFiles(p, base))
    } else if (ent.isFile()) {
      out.push(rel)
    }
  }
  return out
}

function main() {
  try {
    assertKernelInitJsMatchesRecipe(canonical)
  } catch (e) {
    console.error(
      e instanceof Error ? e.message : e,
      '(verify-kernel-seeder-parity)'
    )
    process.exit(1)
  }
  const a = new Set(walkFiles(canonical, canonical))
  const b = new Set(walkFiles(vendored, vendored))
  const onlyA = [...a].filter((x) => !b.has(x)).sort()
  const onlyB = [...b].filter((x) => !a.has(x)).sort()
  if (onlyA.length || onlyB.length) {
    console.error(
      'kernel/ vs packages/bare-os-seeder/kernel/: file set mismatch'
    )
    if (onlyA.length) console.error('Only in kernel/:', onlyA.join(', '))
    if (onlyB.length) console.error('Only in seeder kernel/:', onlyB.join(', '))
    console.error(
      'Remediate from repo root: rsync -a --delete kernel/ packages/bare-os-seeder/kernel/'
    )
    process.exit(1)
  }
  /** @type {string[]} */
  const diffs = []
  for (const rel of [...a].sort()) {
    const pa = path.join(canonical, rel)
    const pb = path.join(vendored, rel)
    const ba = fs.readFileSync(pa)
    const bb = fs.readFileSync(pb)
    if (!ba.equals(bb)) diffs.push(rel)
  }
  if (diffs.length) {
    console.error(
      'kernel/ vs packages/bare-os-seeder/kernel/: content differs for:',
      diffs.join(', ')
    )
    console.error(
      'Remediate: edit canonical kernel/ only, then: node scripts/bundle-kernel-init.mjs && rsync -a --delete kernel/ packages/bare-os-seeder/kernel/'
    )
    process.exit(1)
  }
  const required = [
    'init.js',
    'lib/init/init-main.js',
    'lib/init/fragments/20-init-boot-policy.js',
    'lib/init/fragments/30-init-kernel-extensions.js',
    'lib/boot/00-pear-multisig-shape.js',
    'lib/boot/01-invoke-ctx-hooks.js',
    'lib/bare/manifest.json',
    'lib/bare/bare-module-manifest.json'
  ]
  for (const rel of required) {
    const pa = path.join(canonical, rel)
    if (!fs.existsSync(pa)) {
      console.error('verify-kernel-seeder-parity: required file missing in kernel/:', rel)
      process.exit(1)
    }
  }
  /** Staged /bin scripts must carry the BARE_OS_BIN_API pragma (see coreutils runtime). */
  const badBin = []
  for (const rel of [...a].sort()) {
    if (!rel.startsWith('bin/')) continue
    const pa = path.join(canonical, rel)
    if (!fs.statSync(pa).isFile()) continue
    const head = fs.readFileSync(pa, 'utf8').slice(0, 400)
    if (!head.includes('BARE_OS_BIN_API')) badBin.push(rel)
  }
  if (badBin.length) {
    console.error(
      'kernel/bin missing BARE_OS_BIN_API pragma:',
      badBin.join(', ')
    )
    process.exit(1)
  }
  console.log('kernel/ and packages/bare-os-seeder/kernel/ are identical.')
}

main()