/** 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
}

async function run(ctx, argv) {
  const flagArgs = argv.slice(1).filter((a) => a.startsWith('-') && a !== '--')
  const all = argv.includes('-a')
  const noFlag = flagArgs.length === 0
  const wantS = all || argv.includes('-s') || noFlag
  const wantN = all || argv.includes('-n')
  const wantR = all || argv.includes('-r')
  const wantM = all || argv.includes('-m')
  const wantV = all || argv.includes('-v')

  let name = 'BareOS'
  let version = '0.1'
  const buf = await ctx.vfs.readFile('/etc/os-release')
  if (buf) {
    const t = ctx.b4a.toString(buf)
    for (const line of t.split('\n')) {
      const id = line.match(/^NAME=(.*)$/)
      if (id) name = id[1].replace(/^"|"$/g, '')
      const ver = line.match(/^VERSION=(.*)$/)
      if (ver) version = ver[1].replace(/^"|"$/g, '')
    }
  }

  const parts = []
  if (wantS) parts.push(name)
  if (wantN) parts.push('bare-os')
  if (wantR) parts.push(version)
  if (wantV) parts.push('bare-userland')
  if (wantM) parts.push('unknown')

  ctx.console.log(parts.join(' '))
}