/** 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 mvCopyPath(ctx, from, to, recursive) {
  const st = await ctx.vfs.lstat(from)
  if (!st) return false
  if (st.type === 'symlink') {
    await ctx.vfs.symlink(await ctx.vfs.readlink(from), to)
    return true
  }
  if (st.type === 'file') {
    const buf = await ctx.vfs.readFile(from)
    if (!buf) return false
    await ctx.vfs.writeFile(to, buf)
    return true
  }
  if (st.type === 'directory') {
    if (!recursive) return false
    await ctx.vfs.mkdir(to, { recursive: true })
    const names = await ctx.vfs.readdir(from)
    for (const n of names) {
      if (n === '.bareos_empty') continue
      const f = from.replace(/\/+$/, '') + '/' + n
      const t = to.replace(/\/+$/, '') + '/' + n
      if (!(await mvCopyPath(ctx, f, t, true))) return false
    }
    return true
  }
  return false
}

async function run(ctx, argv) {
  const paths = argv.slice(1).filter((a) => a && a !== '--')
  if (paths.length < 2) {
    ctx.console.error('usage: mv SOURCE... DEST')
    ctx.exitCode = 1
    return
  }
  const dest = paths.pop()
  const sources = paths
  let destIsDir = false
  try {
    const dst = await ctx.vfs.lstat(dest)
    destIsDir = !!(dst && dst.type === 'directory')
  } catch {
    destIsDir = false
  }
  if (sources.length > 1 && !destIsDir) {
    ctx.console.error('mv: target is not a directory')
    ctx.exitCode = 1
    return
  }
  for (const src of sources) {
    const base = src.replace(/\/+$/, '').split('/').pop() || src
    const target =
      destIsDir || sources.length > 1
        ? dest.replace(/\/+$/, '') + '/' + base
        : dest
    try {
      const st = await ctx.vfs.lstat(src)
      const singleFileToFile =
        sources.length === 1 &&
        !destIsDir &&
        st &&
        st.type === 'file'
      if (singleFileToFile) {
        const buf = await ctx.vfs.readFile(src)
        if (!buf) throw new Error('cannot read source')
        await ctx.vfs.writeFile(target, buf)
        await ctx.vfs.unlink(src)
        continue
      }
      if (!(await mvCopyPath(ctx, src, target, true))) {
        throw new Error('cannot copy')
      }
      await ctx.vfs.rm(src, { recursive: true, force: true })
    } catch (e) {
      ctx.console.error('mv: ' + src + ': ' + ((e && e.message) || e))
      ctx.exitCode = 1
    }
  }
}