/* 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 copyPath(ctx, from, to, recursive, followSymlink) {
  const st = await ctx.vfs.lstat(from)
  if (!st) {
    ctx.console.error('cp: ' + from + ': No such file')
    return false
  }
  if (st.type === 'symlink') {
    if (!followSymlink) {
      const t = await ctx.vfs.readlink(from)
      await ctx.vfs.symlink(t, to)
      return true
    }
    const fst = await ctx.vfs.stat(from)
    if (fst.type === 'file') {
      const buf = await ctx.vfs.readFile(from)
      if (!buf) {
        ctx.console.error('cp: cannot read ' + from)
        return false
      }
      await ctx.vfs.writeFile(to, buf)
      return true
    }
    if (fst.type === 'directory') {
      if (!recursive) {
        ctx.console.error('cp: ' + from + ': Is a directory')
        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 copyPath(ctx, f, t, true, followSymlink))) return false
      }
      return true
    }
    ctx.console.error('cp: cannot copy special file ' + from)
    return false
  }
  if (st.type === 'file') {
    const buf = await ctx.vfs.readFile(from)
    if (!buf) {
      ctx.console.error('cp: cannot read ' + from)
      return false
    }
    await ctx.vfs.writeFile(to, buf)
    return true
  }
  if (st.type === 'directory') {
    if (!recursive) {
      ctx.console.error('cp: ' + from + ': Is a directory')
      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 copyPath(ctx, f, t, true, followSymlink))) return false
    }
    return true
  }
  return false
}

async function run(ctx, argv) {
  let recursive = false
  let followSymlink = false
  const paths = []
  for (let i = 1; i < argv.length; i++) {
    const a = argv[i]
    if (a === '-R' || a === '-r' || a === '--recursive') {
      recursive = true
      continue
    }
    if (a === '-L' || a === '--dereference') {
      followSymlink = true
      continue
    }
    if (a === '-P' || a === '--no-dereference') {
      followSymlink = false
      continue
    }
    if (a === '--') {
      paths.push(...argv.slice(i + 1))
      break
    }
    if (a.startsWith('-')) {
      ctx.console.error('cp: unsupported option ' + a)
      ctx.exitCode = 1
      return
    }
    paths.push(a)
  }
  if (paths.length < 2) {
    ctx.console.error('usage: cp [-R] [-L|-P] 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('cp: 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
    if (!(await copyPath(ctx, src, target, recursive, followSymlink)))
      ctx.exitCode = 1
  }
}