/* 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
}

/**
 * Swarm chat CLI — uses ctx.bareOsChat* when the booter exposes swarm chat (bare-os-chat-v1).
 */
async function run(ctx, argv) {
  const cs = ctx.bareOsChatSend
  const sub = argv[1] || ''
  const rest = argv.slice(2).join(' ').trim()

  if (sub === 'send' && rest) {
    if (typeof cs !== 'function') {
      ctx.console.error(
        'chat: bareOsChatSend unavailable — stock hosts enable swarm chat unless BARE_OS_PROTOMUX_CHAT_CHANNEL=0'
      )
      ctx.exitCode = 1
      return
    }
    const r = cs.call(ctx, rest)
    if (r && r.ok === false) ctx.exitCode = 1
    return
  }

  if (sub === 'history') {
    const n = argv[2] ? Number.parseInt(argv[2], 10) : 20
    const hist =
      typeof ctx.vfs?.readFile === 'function'
        ? await ctx.vfs.readFile('/proc/bare_os/chat.json')
        : null
    if (hist) ctx.console.log(ctx.b4a.toString(hist).trimEnd())
    else if (typeof ctx.bareOsReadProcMetricsLive === 'function') {
      ctx.console.log(JSON.stringify(ctx.bareOsReadProcMetricsLive(), null, 2))
    }
    void n
    return
  }

  if (sub === 'who') {
    ctx.console.log(JSON.stringify(ctx.bareOsChatPresence?.() ?? {}, null, 2))
    return
  }

  if (sub === 'join') {
    ctx.console.log(
      'chat join: only the general room is implemented; you are already in general when chat is enabled.'
    )
    return
  }

  if (typeof ctx.readLine !== 'function' || typeof cs !== 'function') {
    ctx.console.error(
      'chat: interactive mode requires bareOsChatSend and readLine (host booter; chat off if BARE_OS_PROTOMUX_CHAT_CHANNEL=0)'
    )
    ctx.exitCode = 1
    return
  }

  ctx.console.log('[chat] general room — type a line; /quit to exit')
  while (true) {
    const line = await ctx.readLine('chat> ')
    if (line == null) break
    const t = line.trim()
    if (t === '/quit' || t === '/exit') break
    if (!t) continue
    const r = cs.call(ctx, t)
    if (r && r.ok === false) {
      ctx.console.error('chat: send failed')
    }
  }
}