import fs from 'node:fs'

/**
 * Idempotently append an `- insert:` patch block to a DSH cordis.patch.yml
 * file unless a row with the same full package name already exists.
 *
 * Usage: node patch-cordis.mjs --file <path> --name <full pkg name> [--id <id>]
 */
function parseArg(key) {
  const i = process.argv.indexOf(key)
  return i >= 0 ? process.argv[i + 1] : undefined
}

const file = parseArg('--file')
const name = parseArg('--name')
const id = parseArg('--id') || (name ? name.split('/').pop() : undefined)

if (!file || !name || !id) {
  console.error('usage: node patch-cordis.mjs --file <path> --name <full-pkg-name> [--id <id>]')
  process.exit(2)
}

let text
try {
  text = fs.readFileSync(file, 'utf8')
} catch (err) {
  console.error(`cannot read ${file}: ${err.message}`)
  process.exit(1)
}

// Idempotency: if a row with this name already exists, nothing to do.
if (text.includes(`name: '${name}'`) || text.includes(`name: "${name}"`)) {
  console.log(`already present: ${name} — no change`)
  process.exit(0)
}

const block = [
  '',
  '- insert:',
  '    - id: ' + id,
  `      name: '${name}'`,
  '      config: {}',
  '',
].join('\n')

// Append preserving a single trailing newline.
const trimmed = text.endsWith('\n') ? text.slice(0, -1) : text
fs.writeFileSync(file, trimmed + '\n' + block + '\n')
console.log(`appended insert for ${name} (id=${id}) to ${file}`)