/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
function bareStdin(ctx) {
  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
}

/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
function bareFormatModeString(mode, type) {
  const typeChar = type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
  const perm = mode & 0o777
  const r = (bit) => (perm & bit ? 'r' : '-')
  const w = (bit) => (perm & bit ? 'w' : '-')
  const x = (bit) => (perm & bit ? 'x' : '-')
  return (
    typeChar +
    r(0o400) +
    w(0o200) +
    x(0o100) +
    r(0o040) +
    w(0o020) +
    x(0o010) +
    r(0o004) +
    w(0o002) +
    x(0o001)
  )
}

/** @param {number} mtimeMs @param {number} [nowMs] */
function bareFormatLsMtime(mtimeMs, nowMs) {
  const now = nowMs != null ? nowMs : Date.now()
  const d = new Date(mtimeMs)
  const months = [
    'Jan',
    'Feb',
    'Mar',
    'Apr',
    'May',
    'Jun',
    'Jul',
    'Aug',
    'Sep',
    'Oct',
    'Nov',
    'Dec'
  ]
  const mon = months[d.getMonth()]
  const day = String(d.getDate()).padStart(2, ' ')
  const sixMo = 180 * 24 * 3600 * 1000
  if (Math.abs(now - mtimeMs) > sixMo) {
    const yr = String(d.getFullYear()).padStart(4, ' ')
    return mon + ' ' + day + '  ' + yr
  }
  const hh = String(d.getHours()).padStart(2, '0')
  const mm = String(d.getMinutes()).padStart(2, '0')
  return mon + ' ' + day + ' ' + hh + ':' + mm
}

/** @param {number} size */
function barePosixBlocks(size) {
  return Math.ceil(Number(size) / 512) || 0
}

/**
 * Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
 * If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
 * @param {Record<string, unknown>} ctx
 * @param {string | Uint8Array} chunk
 * @returns {boolean}
 */
function bareOsEmitRaw(ctx, chunk) {
  if (typeof ctx.bareOsBinWrite === 'function') {
    const b4 = ctx.b4a
    const u8 =
      typeof chunk === 'string'
        ? b4 && typeof b4.from === 'function'
          ? b4.from(chunk)
          : new TextEncoder().encode(chunk)
        : chunk
    ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
    return true
  }
  const w = globalThis.process?.stdout?.write
  if (typeof w === 'function') {
    w.call(globalThis.process.stdout, chunk)
    return true
  }
  return false
}

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
  }
}