import { rm } from 'node:fs/promises'
import { parseArgs } from 'node:util'

const ENTRYPOINT = '.output/server/index.mjs'
const OUTDIR = 'out'

const SUPPORTED_TARGETS: readonly Bun.Build.CompileTarget[] = [
  'bun-windows-x64',
  'bun-darwin-arm64',
  'bun-linux-x64',
  'bun-linux-arm64',
]

const isSupportedTarget = (value: string): value is Bun.Build.CompileTarget =>
  (SUPPORTED_TARGETS as readonly string[]).includes(value)

const { values } = parseArgs({
  options: { target: { type: 'string' } },
  strict: true,
  allowPositionals: false,
})

const resolveTarget = (): Bun.Build.CompileTarget => {
  if (values.target !== undefined) {
    if (!isSupportedTarget(values.target)) {
      throw new Error(
        `Invalid target: ${values.target}\nAllowed: ${SUPPORTED_TARGETS.join(', ')}`,
      )
    }
    return values.target
  }

  const os = process.platform === 'win32' ? 'windows' : process.platform
  const candidate = `bun-${os}-${process.arch}`
  if (!isSupportedTarget(candidate)) {
    throw new Error(`Unsupported host: ${process.platform}-${process.arch}`)
  }
  return candidate
}

const main = async () => {
  const target = resolveTarget()
  const suffix = target.replace('bun-', '')
  const outfile = `server-${suffix}`

  await rm(OUTDIR, { recursive: true, force: true })

  const result = await Bun.build({
    entrypoints: [ENTRYPOINT],
    outdir: OUTDIR,
    compile: { outfile, target },
  })

  if (!result.success) {
    throw new Error(result.logs.map(String).join('\n'))
  }

  console.log(`✓ ${target} → ${OUTDIR}/${outfile}`)
}

main().catch((err) => {
  console.error('❌', err instanceof Error ? err.message : err)
  process.exit(1)
})