// Vendor the pulseq +mr MATLAB package into src/engine/pulseq/+mr so the app
// can stage it into the numbl VFS at runtime. Run against a local pulseq
// checkout: node scripts/vendor-pulseq.mjs [path-to-pulseq]  (default ../../pulseq).
// Copies only .m files, plus pulseq's LICENSE, and records the source commit.
import fs from 'node:fs'
import path from 'node:path'
import { execSync } from 'node:child_process'
import { fileURLToPath } from 'node:url'

const here = path.dirname(fileURLToPath(import.meta.url))
const repoRoot = path.join(here, '..')
const pulseqRoot = path.resolve(repoRoot, process.argv[2] ?? '../../pulseq')
const srcMr = path.join(pulseqRoot, 'matlab', '+mr')
const destRoot = path.join(repoRoot, 'src', 'engine', 'pulseq')
const destMr = path.join(destRoot, '+mr')

if (!fs.existsSync(srcMr)) {
  console.error(`pulseq +mr tree not found at ${srcMr}`)
  process.exit(1)
}

fs.rmSync(destMr, { recursive: true, force: true })
let count = 0
for (const entry of fs.readdirSync(srcMr, { recursive: true })) {
  const rel = String(entry)
  const from = path.join(srcMr, rel)
  if (!fs.statSync(from).isFile() || !rel.endsWith('.m')) continue
  const to = path.join(destMr, rel)
  fs.mkdirSync(path.dirname(to), { recursive: true })
  fs.copyFileSync(from, to)
  count++
}

fs.copyFileSync(path.join(pulseqRoot, 'LICENSE'), path.join(destRoot, 'LICENSE'))

let commit = 'unknown'
try {
  commit = execSync('git describe --tags --always', { cwd: pulseqRoot }).toString().trim()
} catch {
  /* not a git checkout */
}
fs.writeFileSync(
  path.join(destRoot, 'VENDORED.md'),
  `# Vendored pulseq +mr package

Copied from https://github.com/pulseq/pulseq (\`matlab/+mr\`, .m files only)
at version \`${commit}\` by \`scripts/vendor-pulseq.mjs\`. Do not edit these
files here — update the pulseq checkout and re-run \`npm run vendor-pulseq\`.

pulseq is MIT-licensed; see LICENSE in this directory.

Note: at runtime the engine replaces \`+mr/+aux/md5.m\` (which needs Java on
MATLAB) with a wrapper over numbl's \`hash\` builtin — see src/engine/mrFiles.ts.
`,
)
console.log(`vendored ${count} .m files from ${srcMr} (${commit})`)