import { readFile, readdir, mkdir, writeFile } from 'node:fs/promises'
import path from 'node:path'
import { fileURLToPath } from 'node:url'

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
const output = path.resolve(root, '../../frontend/assets/device-agent/bundle.json')
async function filesUnder(directory) {
  const entries = await readdir(path.join(root, directory), { withFileTypes: true })
  const paths = await Promise.all(entries.map(entry => entry.isDirectory()
    ? filesUnder(`${directory}/${entry.name}`)
    : [`${directory}/${entry.name}`]))
  return paths.flat().sort()
}
const packageJson = JSON.parse(await readFile(path.join(root, 'package.json'), 'utf8'))
const paths = [
  ...(await filesUnder('dist')).filter(file => file.endsWith('.js')),
  'scripts/scan_document.py', 'scripts/opencv_postprocess.py', 'scripts/setup-opencv.sh',
  'requirements-opencv.txt',
]
const files = Object.fromEntries(await Promise.all(paths.map(async file => [file, (await readFile(path.join(root, file))).toString('base64')])))
files['package.json'] = Buffer.from(JSON.stringify({
  name: packageJson.name, version: packageJson.version, type: 'module', engines: packageJson.engines,
  scripts: { start: 'node dist/main.js', 'setup:opencv': 'sh scripts/setup-opencv.sh' },
}, null, 2) + '\n').toString('base64')
const bundle = JSON.stringify({
  version: packageJson.version,
  installerTemplate: await readFile(path.join(root, 'scripts/install-linux.sh'), 'utf8'),
  files,
}, null, 2) + '\n'

if (process.argv.includes('--check')) {
  if (await readFile(output, 'utf8') !== bundle) {
    throw new Error('Das Installationspaket ist veraltet. Bitte npm run build:installer ausführen und bundle.json mitcommitten.')
  }
  console.log('Installationspaket entspricht dem aktuellen Agenten.')
} else {
  await mkdir(path.dirname(output), { recursive: true })
  await writeFile(output, bundle)
  console.log(`Installationspaket erstellt: ${output}`)
}