/* 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
}

const BARE_P2P_SUITE_PREFIX = '[bare-p2p-v1]'
const BARE_P2P_SUITE_MAX_HISTORY = 2000

function bareP2pNowMs() {
  return Date.now()
}

function bareP2pId(prefix) {
  const rnd = Math.floor(Math.random() * 0x7fffffff)
  return prefix + '-' + bareP2pNowMs().toString(36) + '-' + rnd.toString(36)
}

function bareP2pHome(ctx) {
  const env = ctx.env && typeof ctx.env === 'object' ? ctx.env : {}
  const home = typeof env.HOME === 'string' && env.HOME ? env.HOME : '/home/guest'
  return home
}

function bareP2pJoinPath(a, b) {
  if (!a.endsWith('/')) return a + '/' + b
  return a + b
}

function bareP2pDataDir(ctx) {
  return bareP2pJoinPath(bareP2pHome(ctx), '.bare/p2p-suite')
}

function bareP2pDataFile(ctx, app) {
  return bareP2pJoinPath(bareP2pDataDir(ctx), app + '.json')
}

async function bareP2pReadJson(ctx, path) {
  try {
    if (!ctx.vfs || typeof ctx.vfs.readFile !== 'function') return null
    const b = await ctx.vfs.readFile(path)
    if (!b) return null
    const t = ctx.b4a.toString(b).trim()
    if (!t) return null
    return JSON.parse(t)
  } catch {
    return null
  }
}

async function bareP2pWriteJson(ctx, path, obj) {
  if (!ctx.vfs || typeof ctx.vfs.writeFile !== 'function') return false
  const body = JSON.stringify(obj, null, 2) + '\n'
  const b4 = ctx.b4a
  const buf =
    b4 && typeof b4.from === 'function'
      ? b4.from(body)
      : new TextEncoder().encode(body)
  try {
    await ctx.vfs.writeFile(path, buf)
    return true
  } catch {
    return false
  }
}

function bareP2pDecodeEnvelope(line) {
  const s = String(line || '')
  if (!s.startsWith(BARE_P2P_SUITE_PREFIX)) return null
  const payload = s.slice(BARE_P2P_SUITE_PREFIX.length).trim()
  if (!payload) return null
  try {
    const obj = JSON.parse(payload)
    if (!obj || typeof obj !== 'object') return null
    return obj
  } catch {
    return null
  }
}

function bareP2pEncodeEnvelope(app, kind, payload) {
  return (
    BARE_P2P_SUITE_PREFIX +
    ' ' +
    JSON.stringify({
      schema: 1,
      suite: 'bare-p2p',
      version: '1',
      app,
      kind,
      tsMs: bareP2pNowMs(),
      payload: payload || {}
    })
  )
}

function bareP2pSend(ctx, app, kind, payload) {
  if (app === 'meshdrop' && typeof ctx.bareOsMeshdropSend === 'function') {
    return ctx.bareOsMeshdropSend({
      app,
      kind,
      payload: payload || {},
      tsMs: bareP2pNowMs()
    })
  }
  if (typeof ctx.bareOsChatSend !== 'function') {
    return { ok: false, reason: 'bareOsChatSend unavailable' }
  }
  return ctx.bareOsChatSend(bareP2pEncodeEnvelope(app, kind, payload))
}

function bareP2pCollectFromHistory(ctx, app, limit) {
  if (app === 'meshdrop' && typeof ctx.bareOsMeshdropHistory === 'function') {
    let hist = []
    try {
      hist = ctx.bareOsMeshdropHistory(
        Math.max(1, Math.min(BARE_P2P_SUITE_MAX_HISTORY, limit || 512))
      )
    } catch {
      hist = []
    }
    if (!Array.isArray(hist)) return []
    const out = []
    for (const ev of hist) {
      if (!ev || typeof ev !== 'object') continue
      if (ev.app !== app) continue
      out.push({
        fromPeerKey: typeof ev.fromPeerKey === 'string' ? ev.fromPeerKey : '',
        displayName: typeof ev.sender === 'string' ? ev.sender : '',
        local: Boolean(ev.local),
        receivedAtMs:
          typeof ev.receivedAtMs === 'number' ? ev.receivedAtMs : bareP2pNowMs(),
        packet: {
          app,
          kind: typeof ev.kind === 'string' ? ev.kind : 'unknown',
          payload: ev.payload && typeof ev.payload === 'object' ? ev.payload : {}
        }
      })
    }
    return out
  }
  if (typeof ctx.bareOsChatHistory !== 'function') return []
  let hist = []
  try {
    hist = ctx.bareOsChatHistory(
      Math.max(1, Math.min(BARE_P2P_SUITE_MAX_HISTORY, limit || 512))
    )
  } catch {
    hist = []
  }
  if (!Array.isArray(hist)) return []
  const out = []
  for (const ev of hist) {
    if (!ev || typeof ev !== 'object') continue
    const body = String(ev.body || '')
    const decoded = bareP2pDecodeEnvelope(body)
    if (!decoded || decoded.app !== app) continue
    out.push({
      fromPeerKey: typeof ev.fromPeerKey === 'string' ? ev.fromPeerKey : '',
      displayName: typeof ev.displayName === 'string' ? ev.displayName : '',
      local: Boolean(ev.local),
      receivedAtMs:
        typeof ev.receivedAtMs === 'number' ? ev.receivedAtMs : bareP2pNowMs(),
      packet: decoded
    })
  }
  return out
}

function bareP2pSubscribe(ctx, app, fn) {
  if (app === 'meshdrop' && typeof ctx.bareOsMeshdropSubscribe === 'function') {
    return ctx.bareOsMeshdropSubscribe((ev) => {
      if (!ev || typeof ev !== 'object' || ev.app !== app) return
      fn({
        fromPeerKey: typeof ev.fromPeerKey === 'string' ? ev.fromPeerKey : '',
        displayName: typeof ev.sender === 'string' ? ev.sender : '',
        local: Boolean(ev.local),
        receivedAtMs:
          typeof ev.receivedAtMs === 'number' ? ev.receivedAtMs : bareP2pNowMs(),
        packet: {
          app,
          kind: typeof ev.kind === 'string' ? ev.kind : 'unknown',
          payload: ev.payload && typeof ev.payload === 'object' ? ev.payload : {}
        }
      })
    })
  }
  if (typeof ctx.bareOsChatSubscribe !== 'function') return () => {}
  return ctx.bareOsChatSubscribe((ev) => {
    if (!ev || typeof ev !== 'object') return
    const body = String(ev.body || '')
    const decoded = bareP2pDecodeEnvelope(body)
    if (!decoded || decoded.app !== app) return
    fn({
      fromPeerKey: typeof ev.fromPeerKey === 'string' ? ev.fromPeerKey : '',
      displayName: typeof ev.displayName === 'string' ? ev.displayName : '',
      local: Boolean(ev.local),
      receivedAtMs:
        typeof ev.receivedAtMs === 'number' ? ev.receivedAtMs : bareP2pNowMs(),
      packet: decoded
    })
  })
}

async function bareP2pReadSwarmSnapshot(ctx) {
  const out = {
    atMs: bareP2pNowMs(),
    peerCount: null,
    topicCount: null,
    peers: []
  }
  const snap = await bareP2pReadJson(ctx, '/proc/bare_os/swarm')
  if (!snap || typeof snap !== 'object') return out
  if (typeof snap.peerCount === 'number') out.peerCount = snap.peerCount
  if (typeof snap.topicCount === 'number') out.topicCount = snap.topicCount
  const peers = Array.isArray(snap.peers) ? snap.peers : []
  const detailsRaw = await bareP2pReadJson(ctx, '/proc/bare_os/peer_details.json')
  const details =
    detailsRaw && typeof detailsRaw === 'object' && Array.isArray(detailsRaw.peers)
      ? detailsRaw.peers
      : []
  /** @type {Map<string, Record<string, unknown>>} */
  const byKey = new Map()
  for (const d of details) {
    if (!d || typeof d !== 'object') continue
    const rk = typeof d.remotePublicKey === 'string' ? d.remotePublicKey : ''
    const pid = typeof d.peerId === 'string' ? d.peerId : ''
    if (rk) byKey.set('k:' + rk, d)
    if (pid) byKey.set('p:' + pid, d)
  }
  const merged = []
  for (const p of peers) {
    if (!p || typeof p !== 'object') continue
    const rk = typeof p.remotePublicKey === 'string' ? p.remotePublicKey : ''
    const pid = typeof p.peerId === 'string' ? p.peerId : ''
    const d = (rk && byKey.get('k:' + rk)) || (pid && byKey.get('p:' + pid)) || null
    merged.push(d && typeof d === 'object' ? { ...p, ...d } : p)
  }
  out.peers = merged.slice(0, 128)
  return out
}

async function bareP2pReadProcJson(ctx, path) {
  const v = await bareP2pReadJson(ctx, path)
  return v && typeof v === 'object' ? v : {}
}

async function run(ctx, argv) {
  const argv0 = argv[0] || 'taskmesh'
  const args = argv.slice(1)
  if (args.includes('-h') || args.includes('--help') || args.length === 0) {
    ctx.console.log(
      'usage: ' +
        argv0 +
        ' add TEXT\n' +
        '       ' +
        argv0 +
        ' done TASK_ID\n' +
        '       ' +
        argv0 +
        ' list [open|all]\n' +
        'P2P task board over append-only bare-p2p events.\n' +
        'See man taskmesh.'
    )
    if (args.length === 0) ctx.exitCode = 1
    return
  }

  const sub = args[0]
  if (sub === 'add') {
    const text = args.slice(1).join(' ').trim()
    if (!text) {
      ctx.console.error(argv0 + ': add requires text')
      ctx.exitCode = 1
      return
    }
    const taskId = bareP2pId('task')
    const r = bareP2pSend(ctx, 'taskmesh', 'task.add', {
      taskId,
      text
    })
    if (r && r.ok === false) ctx.exitCode = 1
    else ctx.console.log('added ' + taskId)
    return
  }

  if (sub === 'done') {
    const taskId = String(args[1] || '').trim()
    if (!taskId) {
      ctx.console.error(argv0 + ': done requires TASK_ID')
      ctx.exitCode = 1
      return
    }
    const r = bareP2pSend(ctx, 'taskmesh', 'task.done', { taskId })
    if (r && r.ok === false) ctx.exitCode = 1
    else ctx.console.log('completed ' + taskId)
    return
  }

  if (sub === 'list') {
    const mode = args[1] === 'all' ? 'all' : 'open'
    const rows = bareP2pCollectFromHistory(ctx, 'taskmesh', 2000)
    /** @type {Map<string, { taskId: string, text: string, done: boolean, atMs: number }>} */
    const board = new Map()
    for (const row of rows) {
      const kind = row.packet?.kind
      const p = row.packet?.payload
      if (!p || typeof p !== 'object') continue
      if (kind === 'task.add' && typeof p.taskId === 'string') {
        board.set(p.taskId, {
          taskId: p.taskId,
          text: typeof p.text === 'string' ? p.text : '',
          done: false,
          atMs: row.receivedAtMs
        })
      } else if (kind === 'task.done' && typeof p.taskId === 'string') {
        const cur = board.get(p.taskId)
        if (cur) cur.done = true
      }
    }
    const all = [...board.values()].sort((a, b) => a.atMs - b.atMs)
    for (const t of all) {
      if (mode !== 'all' && t.done) continue
      ctx.console.log((t.done ? '[x] ' : '[ ] ') + t.taskId + ' ' + t.text)
    }
    return
  }

  ctx.console.error(argv0 + ': unsupported subcommand')
  ctx.exitCode = 1
}