/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
function bareStdin(ctx) {
  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
}

async function run(ctx, argv) {
  const vfs = ctx.vfs
  const home = vfs.env?.HOME || '/home/guest'
  const h = String(home).replace(/\/$/, '')
  const tabPath = `${h}/.crontab`
  const rest = argv.slice(1)

  if (rest.length === 0) {
    ctx.console.error('crontab: usage: crontab -l | crontab -r | crontab <file>')
    ctx.exitCode = 1
    return
  }

  if (rest[0] === '-l') {
    try {
      const b = await vfs.readFile(tabPath)
      if (!b || !b.length) {
        ctx.console.log('no crontab for user')
        return
      }
      const s = ctx.b4a.toString(b)
      ctx.console.log(s.endsWith('\n') ? s : s + '\n')
    } catch {
      ctx.console.log('no crontab for user')
    }
    return
  }

  if (rest[0] === '-r') {
    if (ctx.identity?.state !== 'unlocked') {
      ctx.console.error('crontab: log in to modify crontab')
      ctx.exitCode = 1
      return
    }
    try {
      await vfs.unlink(tabPath)
    } catch (e) {
      const msg = String(e?.message || e)
      if (/not found|ENOENT|no entry|missing/i.test(msg)) {
        ctx.console.error('crontab: no crontab for user')
      } else {
        ctx.console.error('crontab: ' + msg)
      }
      ctx.exitCode = 1
    }
    return
  }

  if (rest[0].startsWith('-')) {
    ctx.console.error('crontab: unknown option ' + rest[0])
    ctx.exitCode = 1
    return
  }

  if (ctx.identity?.state !== 'unlocked') {
    ctx.console.error('crontab: log in to install crontab')
    ctx.exitCode = 1
    return
  }

  const file = rest[0]
  try {
    const b = await vfs.readFile(file)
    if (b == null) {
      ctx.console.error('crontab: ' + file + ': cannot read')
      ctx.exitCode = 1
      return
    }
    await vfs.writeFile(tabPath, b)
  } catch (e) {
    ctx.console.error('crontab: ' + (e.message || e))
    ctx.exitCode = 1
  }
}