const expectedNodeMajor = 24
const expectedPnpmVersion = '10.33.0'

const actualNodeVersion = process.versions.node
const actualNodeMajor = Number.parseInt(
  actualNodeVersion.split('.')[0] ?? '',
  10,
)
const packageManager = process.env.npm_config_user_agent ?? ''
const requirePackageManager = process.argv.includes('--require-package-manager')
const pnpmMatch = /(?:^|\s)pnpm\/([^\s]+)/u.exec(packageManager)

const failures = []
if (actualNodeMajor !== expectedNodeMajor) {
  failures.push(
    `Node.js ${expectedNodeMajor}.x is required; current runtime is ${actualNodeVersion}.`,
  )
}
if (requirePackageManager && !pnpmMatch) {
  failures.push(
    `pnpm ${expectedPnpmVersion} is required; no pnpm user agent was detected.`,
  )
} else if (
  pnpmMatch?.[1] !== undefined &&
  pnpmMatch[1] !== expectedPnpmVersion
) {
  failures.push(
    `pnpm ${expectedPnpmVersion} is required; current package manager is pnpm ${pnpmMatch[1]}.`,
  )
}

if (failures.length > 0) {
  console.error('DevRunbook runtime preflight failed:')
  for (const failure of failures) console.error(`- ${failure}`)
  console.error(
    'Use the versions declared in .nvmrc, .node-version and package.json before installing or verifying.',
  )
  process.exit(1)
}

console.log(
  `DevRunbook runtime preflight passed: Node.js ${actualNodeVersion}${pnpmMatch ? `, pnpm ${pnpmMatch[1]}` : ''}.`,
)