import { createUpscaleHost } from './upscale-host.mjs'
import { purgeStudio2Files } from './studio2-purge.mjs'
import { stableMemoryArgs } from './comfy-memory-policy.mjs'
import { createGpuReservation } from './gpu-reservation.mjs'
import { createGpuProxy } from './gpu-proxy.mjs'
import { createYueGpHost } from './yuegp-host.mjs'
import { createYue2Host } from './yue2-host.mjs'
import http from 'node:http'
import net from 'node:net'
import { execFile, spawn } from 'node:child_process'
import { promisify } from 'node:util'
import { readdirSync, existsSync, rmSync, readFileSync, openSync, mkdirSync, writeFileSync, unlinkSync, statSync, createReadStream } from 'node:fs'
import { basename, dirname, join, resolve, relative, isAbsolute } from 'node:path'
import { tmpdir } from 'node:os'

const execFileAsync = promisify(execFile)
const port = Number(process.env.COMFY_CONTROL_PORT || 8199)
const proxyPort = Number(process.env.COMFY_PROXY_PORT || 8198)
const token = process.env.COMFY_CONTROL_TOKEN || ''
const defaultHttp = (process.env.COMFY_LISTEN || 'http://127.0.0.1:8188').replace(/\/$/, '')
const idleMs = Math.max(60_000, Number(process.env.COMFY_IDLE_MS || 30 * 60 * 1000) || 30 * 60 * 1000)
const trainingUrl = String(process.env.TRAINING_CONTROL_URL || 'http://127.0.0.1:8200').replace(/\/$/, '')

let lastWorkAt = Date.now()
let lastQueueRunning = 0
let lastLaunchAt = 0
let stoppedByAgent = false
let lastHealthyPort = 0
let lastProcessUp = false
let lastTraining = { busy: false, jobId: null, status: null, name: null, message: '' }

function markWork() {
  lastWorkAt = Date.now()
  stoppedByAgent = false
}

async function trainingLock() {
  try {
    const res = await fetch(`${trainingUrl}/status`, { signal: AbortSignal.timeout(2500) })
    const body = await res.json().catch(() => null)
    const job = body?.job
    const status = String(job?.status || '')
    const busy = Boolean(job && ['preparing', 'queued', 'running', 'stopping'].includes(status))
    lastTraining = {
      busy,
      jobId: job?.id || null,
      status: busy ? status : null,
      name: busy ? (job?.outputName || null) : null,
      message: busy
        ? `AITraining is ${status}${job?.outputName ? ` (${job.outputName})` : ''}. Stop that job before poking Comfy.`
        : ''
    }
    return lastTraining
  } catch {
    lastTraining = { busy: false, jobId: null, status: null, name: null, message: '' }
    return lastTraining
  }
}

function json(res, status, body) {
  const payload = JSON.stringify(body)
  res.writeHead(status, { 'Content-Type': 'application/json', 'Content-Length': Buffer.byteLength(payload) })
  res.end(payload)
}

function authorized(req) {
  if (!token) return true
  const header = String(req.headers.authorization || '')
  return header === `Bearer ${token}`
}

function lockPorts() {
  const ports = []
  try {
    const dir = join(process.env.APPDATA || '', 'Comfy Desktop', 'port-locks')
    for (const name of readdirSync(dir)) {
      const match = name.match(/^port-(\d+)\.json$/)
      if (match) ports.push(Number(match[1]))
    }
  } catch { /* ignore */ }
  return ports
}

function candidatePorts() {
  const skip = new Set([port, proxyPort])
  const ordered = []
  const seen = new Set()
  const add = (value) => {
    const next = Number(value)
    if (!Number.isInteger(next) || next < 1 || next > 65535) return
    if (skip.has(next) || seen.has(next)) return
    seen.add(next)
    ordered.push(next)
  }
  for (const next of lockPorts()) add(next)
  try {
    const url = new URL(defaultHttp.includes('://') ? defaultHttp : `http://${defaultHttp}`)
    if (url.port) add(url.port)
  } catch { /* ignore */ }
  for (let next = 8188; next <= 8210; next++) add(next)
  return ordered
}

const probeSkipUntil = new Map()

async function probeStats(portNum, timeoutMs = 400) {
  if (Date.now() < (probeSkipUntil.get(portNum) || 0)) return null
  try {
    const res = await fetch(`http://127.0.0.1:${portNum}/system_stats`, { signal: AbortSignal.timeout(timeoutMs) })
    if (!res.ok) return null
    const stats = await res.json()
    if (!stats?.system) return null
    probeSkipUntil.delete(portNum)
    return stats
  } catch (error) {
    const timedOut = error?.name === 'TimeoutError' || error?.name === 'AbortError' || /timeout/i.test(String(error?.message || ''))
    if (timedOut) probeSkipUntil.set(portNum, Date.now() + 30_000)
    return null
  }
}

function advertisedPort(stats) {
  const argv = stats?.system?.argv
  if (!Array.isArray(argv)) return 0
  const index = argv.findIndex(item => String(item) === '--port')
  if (index >= 0) return Number(argv[index + 1]) || 0
  const flag = argv.find(item => /^--port=\d+$/.test(String(item)))
  if (flag) return Number(String(flag).split('=')[1]) || 0
  return 0
}

async function findHealthyPort() {
  const probed = await Promise.all(candidatePorts().map(async (next) => {
    const stats = await probeStats(next)
    return stats ? { port: next, advertised: advertisedPort(stats) } : null
  }))
  const found = probed.filter(Boolean)
  const native = found.find(item => item.advertised && item.advertised === item.port)
  if (native) return native.port
  for (const item of found) {
    if (item.advertised && found.some(other => other.port === item.advertised)) return item.advertised
  }
  return found[0]?.port || 0
}

let proxyServer = null
let proxyTarget = 0

function ensureProxyListening() {
  if (proxyServer) return
  proxyServer = createGpuProxy({ target: () => proxyTarget, reservation: gpuReservation, authorized, markWork, externalBusy: () => yueGp.busy() || yue2.busy() || upscale.busy() })
  proxyServer.on('error', (error) => {
    console.log(JSON.stringify({ src: 'comfy-host-agent', event: 'proxy-error', error: String(error.message || error) }))
  })
  proxyServer.listen(proxyPort, '0.0.0.0', () => {
    console.log(JSON.stringify({ src: 'comfy-host-agent', event: 'proxy', listen: proxyPort, target: proxyTarget || null }))
  })
}

function setProxyTarget(targetPort) {
  ensureProxyListening()
  const next = Number(targetPort) || 0
  if (proxyTarget === next) return
  proxyTarget = next
  console.log(JSON.stringify({ src: 'comfy-host-agent', event: 'proxy-target', listen: proxyPort, target: proxyTarget || null }))
}

function markAsleep() {
  stoppedByAgent = true
  lastQueueRunning = 0
  lastHealthyPort = 0
  lastProcessUp = false
  lastLaunchAt = 0
  probeSkipUntil.clear()
  setProxyTarget(0)
}

async function syncProxy() {
  const healthyPort = await findHealthyPort()
  lastHealthyPort = healthyPort || 0
  if (healthyPort) {
    setProxyTarget(healthyPort)
    lastProcessUp = true
  } else {
    setProxyTarget(0)
    lastProcessUp = false
  }
  return healthyPort
}

// PowerShell -Command text used to contain the literal main.py path, so the
// probe process matched itself and /start forever returned already/booting.
const PS_COMFY_MAIN =
  "Get-CimInstance Win32_Process | Where-Object { $_.Name -match '^python(w)?\\.exe$' -and $_.CommandLine -match ('ComfyUI' + '[\\\\/]main\\.py') } | Select-Object -First 1 -ExpandProperty ProcessId"

async function processUp() {
  try {
    const { stdout } = await execFileAsync('tasklist', ['/FO', 'CSV', '/NH'], { windowsHide: true, timeout: 4000 })
    if (/Comfy Desktop|ComfyUI/i.test(stdout)) return true
  } catch { /* ignore */ }
  try {
    const { stdout } = await execFileAsync('powershell.exe', [
      '-NoProfile', '-Command',
      PS_COMFY_MAIN
    ], { windowsHide: true, timeout: 6000 })
    return Boolean(String(stdout).trim())
  } catch {
    return false
  }
}

function readJsonFile(path) {
  try {
    return JSON.parse(readFileSync(path, 'utf8'))
  } catch {
    return null
  }
}

function desktopListenPort() {
  try {
    const url = new URL(defaultHttp.includes('://') ? defaultHttp : `http://${defaultHttp}`)
    const next = Number(url.port || 8188) || 8188
    if (next === port || next === proxyPort) return 8188
    return next
  } catch {
    return 8188
  }
}

function pickDesktopInstall() {
  const wanted = String(process.env.COMFY_INSTANCE_NAME || 'ComfyUI (1)').trim()
  const parsed = readJsonFile(join(process.env.APPDATA || '', 'Comfy Desktop', 'installations.json'))
  const installs = (Array.isArray(parsed) ? parsed : [])
    .filter(item => item && item.status === 'installed' && item.installPath && item.sourceId !== 'cloud')
  if (!installs.length) return null
  return installs.find(item => item.name === wanted)
    || installs.slice().sort((a, b) => Number(b.lastLaunchedAt || 0) - Number(a.lastLaunchedAt || 0))[0]
}

function resolveHeadlessLaunch() {
  if (process.env.COMFY_LAUNCH_CMD) {
    return {
      command: process.env.COMFY_LAUNCH_CMD,
      cwd: process.env.COMFY_LAUNCH_CWD || undefined,
      mode: 'env'
    }
  }
  const inst = pickDesktopInstall()
  if (!inst) return null
  const venvPython = join(inst.installPath, 'ComfyUI', '.venv', 'Scripts', 'python.exe')
  const standalonePython = join(inst.installPath, 'standalone-env', 'python.exe')
  const python = existsSync(venvPython) ? venvPython : standalonePython
  const cwd = inst.installPath
  const main = join(inst.installPath, 'ComfyUI', 'main.py')
  if (!existsSync(python) || !existsSync(main)) return null
  const extra = join(process.env.APPDATA || '', 'Comfy Desktop', 'instance-model-paths', `${inst.id}.yaml`)
  const shared = join(process.env.APPDATA || '', 'Comfy Desktop', 'shared_model_paths.yaml')
  const extraConfig = existsSync(extra) ? extra : (existsSync(shared) ? shared : '')
  const roots = sharedRoots()
  const args = [
    '-s',
    '-u',
    join('ComfyUI', 'main.py'),
    '--listen', '0.0.0.0',
    '--port', String(desktopListenPort()),
    '--disable-auto-launch'
  ]
  const extraArgs = String(inst.launchArgs || '').trim()
  if (extraArgs) args.push(...extraArgs.split(/\s+/).filter(Boolean))
  const cliPath = join(inst.installPath, 'ComfyUI', 'comfy', 'cli_args.py')
  const memoryArgs = stableMemoryArgs(args, { cliSource: existsSync(cliPath) ? readFileSync(cliPath, 'utf8') : '' })
  args.splice(0, args.length, ...memoryArgs)
  if (extraConfig) args.push('--extra-model-paths-config', extraConfig)
  if (existsSync(roots.input)) args.push('--input-directory', roots.input)
  if (existsSync(roots.output)) args.push('--output-directory', roots.output)
  return {
    file: python,
    args,
    cwd,
    mode: 'headless',
    instance: inst.name,
    log: join(inst.installPath, 'logs', 'aigen-headless.log')
  }
}

function desktopShellCommand() {
  const local = process.env.LOCALAPPDATA || ''
  const desktop = `${local}\\Programs\\Comfy Desktop\\Comfy Desktop.exe`
  return `start "" "${desktop}"`
}

async function pythonMainUp() {
  try {
    const { stdout } = await execFileAsync('tasklist', ['/FO', 'CSV', '/NH'], { windowsHide: true, timeout: 2000 })
    if (!/python(?:w)?\.exe/i.test(stdout)) return false
    const { stdout: verbose } = await execFileAsync('powershell.exe', [
      '-NoProfile', '-Command',
      PS_COMFY_MAIN
    ], { windowsHide: true, timeout: 2500 })
    return Boolean(String(verbose).trim())
  } catch {
    return false
  }
}

function portInUse(portNum) {
  return new Promise((resolve) => {
    const probe = net.createServer()
    probe.once('error', () => resolve(true))
    probe.once('listening', () => {
      probe.close(() => resolve(false))
    })
    probe.listen(portNum, '0.0.0.0')
  })
}

async function pickListenPort() {
  const preferred = desktopListenPort()
  const ordered = [preferred, ...candidatePorts()]
  const seen = new Set()
  for (const next of ordered) {
    if (!next || seen.has(next)) continue
    seen.add(next)
    if (await probeStats(next, 400)) return next
    if (!(await portInUse(next))) return next
  }
  return preferred
}

function windowlessPython(pythonPath) {
  if (process.platform !== 'win32') return pythonPath
  if (!/python\.exe$/i.test(pythonPath)) return pythonPath
  const pythonw = pythonPath.replace(/python\.exe$/i, 'pythonw.exe')
  return existsSync(pythonw) ? pythonw : pythonPath
}

function vbsString(value) {
  return `"${String(value).replace(/"/g, '""')}"`
}

function spawnViaWscript(file, args, opts = {}) {
  const command = [file, ...args].map((part) => {
    const text = String(part)
    return /\s|"/.test(text) ? `"${text.replace(/"/g, '\\"')}"` : text
  }).join(' ')
  const lines = ['Set sh = CreateObject("WScript.Shell")']
  if (opts.cwd) lines.push(`sh.CurrentDirectory = ${vbsString(opts.cwd)}`)
  lines.push(`sh.Run ${vbsString(command)}, 0, False`)
  const tmp = join(tmpdir(), `aigen-launch-${process.pid}-${Date.now()}.vbs`)
  writeFileSync(tmp, `${lines.join('\r\n')}\r\n`)
  const child = spawn('wscript.exe', ['//B', '//Nologo', tmp], {
    detached: true,
    stdio: 'ignore',
    windowsHide: true
  })
  child.unref()
  const cleanup = () => {
    try { unlinkSync(tmp) } catch { /* ignore */ }
  }
  child.once('exit', cleanup)
  setTimeout(cleanup, 15000)
  return child
}

function spawnHidden(file, args, opts = {}) {
  const exe = windowlessPython(file)
  // python.exe + detached:true allocates an empty console on the active display.
  // pythonw.exe is windowless. If it is missing, launch via hidden WScript.
  if (process.platform === 'win32' && /python\.exe$/i.test(exe)) {
    return spawnViaWscript(exe, args, opts)
  }
  const child = spawn(exe, args, {
    detached: true,
    stdio: opts.stdio || 'ignore',
    windowsHide: true,
    cwd: opts.cwd
  })
  child.unref()
  return child
}

function spawnShellHidden(command, cwd) {
  if (process.platform === 'win32') {
    const match = String(command).match(/start\s+""\s+"([^"]+)"/i)
      || String(command).match(/^"([^"]+\.exe)"\s*$/i)
    if (match) return spawnHidden(match[1], [], { cwd })
    return spawnViaWscript(process.env.ComSpec || 'cmd.exe', ['/d', '/s', '/c', command], { cwd })
  }
  const child = spawn(command, { shell: true, detached: true, stdio: 'ignore', cwd })
  child.unref()
  return child
}

async function startComfy() {
  markWork()
  const launch = resolveHeadlessLaunch()
  if (launch?.file) {
    const port = await pickListenPort()
    const portIdx = launch.args.indexOf('--port')
    if (portIdx >= 0) launch.args[portIdx + 1] = String(port)
    let stdio = 'ignore'
    try {
      mkdirSync(dirname(launch.log), { recursive: true })
      stdio = ['ignore', openSync(launch.log, 'a'), openSync(launch.log, 'a')]
    } catch { /* ignore */ }
    const child = spawnHidden(launch.file, launch.args, {
      stdio,
      cwd: launch.cwd
    })
    console.log(JSON.stringify({
      src: 'comfy-host-agent',
      event: 'start',
      mode: launch.mode,
      instance: launch.instance,
      cwd: launch.cwd,
      port,
      pid: child.pid || null
    }))
    return { started: true, mode: launch.mode, instance: launch.instance, cwd: launch.cwd, port, pid: child.pid || null }
  }
  const fallback = {
    command: launch?.command || desktopShellCommand(),
    cwd: launch?.cwd || process.env.COMFY_LAUNCH_CWD || undefined,
    mode: launch?.mode || 'desktop-shell'
  }
  spawnShellHidden(fallback.command, fallback.cwd)
  console.log(JSON.stringify({
    src: 'comfy-host-agent',
    event: 'start',
    mode: fallback.mode,
    cwd: fallback.cwd || null
  }))
  return { started: true, mode: fallback.mode, instance: null, cwd: fallback.cwd || null }
}

async function fetchLocalQueue(portNum) {
  if (!portNum) return { running: 0, pending: 0, ok: false }
  try {
    const res = await fetch(`http://127.0.0.1:${portNum}/queue`, { signal: AbortSignal.timeout(2500) })
    if (!res.ok) return { running: 0, pending: 0, ok: false }
    const payload = await res.json()
    return {
      running: Array.isArray(payload?.queue_running) ? payload.queue_running.length : 0,
      pending: Array.isArray(payload?.queue_pending) ? payload.queue_pending.length : 0,
      ok: true
    }
  } catch {
    return { running: 0, pending: 0, ok: false }
  }
}

function isWorkHttp(chunk) {
  const head = chunk.toString('latin1', 0, Math.min(chunk.length, 256))
  const line = head.split('\r\n')[0] || ''
  const match = line.match(/^(GET|HEAD|POST|PUT|PATCH|DELETE)\s+(\S+)/i)
  if (!match) return false
  const method = match[1].toUpperCase()
  let path = String(match[2] || '').split('?')[0] || ''
  try { path = decodeURIComponent(path) } catch { /* keep raw */ }
  if (method === 'GET' || method === 'HEAD') return false
  if (/^\/(system_stats|queue|object_info|internal)\b/i.test(path)) return false
  return true
}

async function taskkillImage(image) {
  try {
    await execFileAsync('taskkill', ['/IM', image, '/F', '/T'], { windowsHide: true, timeout: 8000 })
    return true
  } catch {
    return false
  }
}

async function stopComfyProcesses() {
  const killed = []
  if (await taskkillImage('Comfy Desktop.exe')) killed.push('Comfy Desktop.exe')
  if (await taskkillImage('ComfyUI.exe')) killed.push('ComfyUI.exe')
  try {
    const { stdout } = await execFileAsync('powershell.exe', [
      '-NoProfile', '-Command',
      "Get-CimInstance Win32_Process | Where-Object { $_.Name -match '^python(w)?\\.exe$' -and $_.CommandLine -match ('ComfyUI' + '[\\\\/]main\\.py') } | ForEach-Object { Stop-Process -Id $_.ProcessId -Force -ErrorAction SilentlyContinue; $_.ProcessId }"
    ], { windowsHide: true, timeout: 8000 })
    if (String(stdout).trim()) killed.push('main.py')
  } catch { /* ignore */ }
  return killed
}

async function noteQueue(portNum) {
  const queue = await fetchLocalQueue(portNum)
  if (!queue.ok) return queue
  if (queue.running > 0 || queue.pending > 0) {
    markWork()
  } else if (lastQueueRunning > 0 && queue.running === 0) {
    lastWorkAt = Date.now()
  }
  lastQueueRunning = queue.running
  return queue
}

async function maybeIdleStop(healthyPort) {
  if (gpuReservation.availability().busy) return
  if (healthyPort) {
    stoppedByAgent = false
    const queue = await noteQueue(healthyPort)
    if (!queue.ok) return
    if (queue.running > 0 || queue.pending > 0) return
  } else if (await processUp()) {
    stoppedByAgent = false
  } else {
    stoppedByAgent = true
    return
  }
  if (Date.now() - lastWorkAt < idleMs) return
  console.log(JSON.stringify({
    src: 'comfy-host-agent',
    event: 'idle-stop',
    idleMs,
    lastActivityAt: new Date(lastWorkAt).toISOString(),
    http: Boolean(healthyPort)
  }))
  const killed = await stopComfyProcesses()
  markAsleep()
  console.log(JSON.stringify({ src: 'comfy-host-agent', event: 'stopped', reason: 'idle', killed }))
}

function sharedRoots() {
  const local = process.env.LOCALAPPDATA || ''
  return {
    input: process.env.COMFY_INPUT_DIR || join(local, 'Comfy-Desktop', 'ComfyUI-Shared', 'input'),
    output: process.env.COMFY_OUTPUT_DIR || join(local, 'Comfy-Desktop', 'ComfyUI-Shared', 'output'),
    temp: process.env.COMFY_TEMP_DIR || join(local, 'Comfy-Desktop', 'ComfyUI-Shared', 'temp')
  }
}

function installLeafRoots(leaf) {
  const local = process.env.LOCALAPPDATA || ''
  const roots = []
  const installs = join(local, 'Comfy-Desktop', 'ComfyUI-Installs')
  try {
    for (const dir of readdirSync(installs, { withFileTypes: true })) {
      if (!dir.isDirectory()) continue
      roots.push(join(installs, dir.name, 'ComfyUI', leaf))
    }
  } catch { /* ignore */ }
  return roots
}

function inputRoots() {
  const roots = [sharedRoots().input]
  const cwd = process.env.COMFY_LAUNCH_CWD
  if (cwd) roots.push(join(cwd, 'input'))
  roots.push(...installLeafRoots('input'))
  return [...new Set(roots)]
}

function outputRoots() {
  const roots = [sharedRoots().output]
  const cwd = process.env.COMFY_LAUNCH_CWD
  if (cwd) {
    roots.push(join(cwd, 'output'))
    roots.push(join(cwd, 'ComfyUI', 'output'))
  }
  roots.push(...installLeafRoots('output'))
  return [...new Set(roots)]
}

function tempRoots() {
  const roots = [sharedRoots().temp]
  const cwd = process.env.COMFY_LAUNCH_CWD
  if (cwd) {
    roots.push(join(cwd, 'temp'))
    roots.push(join(cwd, 'ComfyUI', 'temp'))
  }
  roots.push(...installLeafRoots('temp'))
  return [...new Set(roots)]
}

function rootsForType(type) {
  if (type === 'input') return inputRoots()
  if (type === 'temp') return [...tempRoots(), ...outputRoots()]
  return [...outputRoots(), ...tempRoots()]
}

function safeFile(root, subfolder, filename) {
  const name = basename(String(filename || ''))
  if (!name || name === '.' || name === '..') return null
  const rootAbs = resolve(root)
  const target = resolve(rootAbs, String(subfolder || '').replace(/\.\./g, ''), name)
  const rel = relative(rootAbs, target)
  if (!rel || rel.startsWith('..') || isAbsolute(rel)) return null
  return target
}

function findOutputFile(filename, subfolder, type) {
  const roots = rootsForType(type || 'output')
  const subs = [...new Set([String(subfolder || ''), type === 'input' ? '' : 'video', type === 'input' ? '' : 'audio', ''])]
  for (const root of roots) {
    if (!existsSync(root)) continue
    for (const sub of subs) {
      const path = safeFile(root, sub, filename)
      if (path && existsSync(path)) {
        try {
          if (statSync(path).isFile()) return path
        } catch { /* ignore */ }
      }
    }
  }
  return null
}

function streamFile(res, path) {
  const size = statSync(path).size
  const lower = path.toLowerCase()
  const type = lower.endsWith('.mp4') ? 'video/mp4'
    : lower.endsWith('.webm') ? 'video/webm'
    : lower.endsWith('.flac') ? 'audio/flac'
    : lower.endsWith('.wav') ? 'audio/wav'
    : lower.endsWith('.mp3') ? 'audio/mpeg'
    : lower.endsWith('.png') ? 'image/png'
    : lower.endsWith('.jpg') || lower.endsWith('.jpeg') ? 'image/jpeg'
    : 'application/octet-stream'
  res.writeHead(200, {
    'Content-Type': type,
    'Content-Length': size,
    'Cache-Control': 'no-store'
  })
  createReadStream(path).pipe(res)
}

function removeFile(path) {
  if (!path || !existsSync(path)) return false
  try {
    rmSync(path, { force: true })
    return true
  } catch {
    return false
  }
}

function fileStem(filename) {
  const name = basename(String(filename || ''))
  const dot = name.lastIndexOf('.')
  return dot > 0 ? name.slice(0, dot) : name
}

function removeNamedFile(roots, filename, subfolders, { stemSiblings = true } = {}) {
  const deleted = []
  const name = basename(String(filename || ''))
  if (!name) return deleted
  const stem = fileStem(name)
  const subs = [...new Set((subfolders || []).map(item => String(item || '')))]
  for (const root of roots) {
    if (!existsSync(root)) continue
    for (const sub of subs) {
      const dir = sub ? join(root, String(sub).replace(/\.\./g, '')) : root
      const exact = safeFile(root, sub, name)
      if (removeFile(exact)) deleted.push(exact)
      if (!stemSiblings || !stem || !existsSync(dir)) continue
      let files = []
      try { files = readdirSync(dir) } catch { continue }
      for (const file of files) {
        if (file === name || file.startsWith(`${stem}.`)) {
          const path = join(dir, file)
          if (removeFile(path)) deleted.push(path)
        }
      }
    }
  }
  return deleted
}

function defaultSweepPrefixes() {
  return ['MiniMax_H3', 'xAIGen', 'XAIgen', 'LTX23', 'AIGen', 'v2-krea', 'v2-generate']
}

function looksLikeStudioStill(name) {
  // Studio uploads: 12-hex job prefix, or legacy aigen_<hex>_…
  const n = String(name || '')
  return /^[0-9a-f]{12}_.+\.(png|jpe?g|webp|gif)$/i.test(n)
    || /^aigen_[0-9a-f]+_.+\.(png|jpe?g|webp|gif)$/i.test(n)
}

function isStudioOutputName(file, sub, prefixes) {
  if (looksLikeStudioStill(file) && (!sub || sub === 'image' || sub === 'still')) return true
  if (sub === 'audio') {
    return prefixes.some(prefix => file.startsWith(prefix)) || file.startsWith('ComfyUI')
  }
  if (!sub) {
    return prefixes.some(prefix => prefix !== 'LTX23' && file.startsWith(prefix))
  }
  return prefixes.some(prefix => file.startsWith(prefix))
}

function sweepStaleStudioInputs(maxAgeMs = 15 * 60 * 1000) {
  const deleted = []
  const cutoff = Date.now() - Math.max(60_000, Number(maxAgeMs) || 900_000)
  for (const root of inputRoots()) {
    if (!existsSync(root)) continue
    let files = []
    try { files = readdirSync(root) } catch { continue }
    for (const file of files) {
      if (!looksLikeStudioStill(file)) continue
      const path = join(root, file)
      try {
        const st = statSync(path)
        if (st.isDirectory() || st.mtimeMs > cutoff) continue
      } catch {
        continue
      }
      if (removeFile(path)) deleted.push(path)
    }
  }
  return deleted
}

function sweepStaleStudioOutputs(prefixes, subfolders, maxAgeMs = 15 * 60 * 1000) {
  const deleted = []
  const names = [...new Set([...defaultSweepPrefixes(), ...(prefixes || [])])].map(item => String(item || '').trim()).filter(Boolean)
  const subs = [...new Set(['video', 'audio', 'image', 'still', ...(subfolders || [])])].map(item => String(item || ''))
  const cutoff = Date.now() - Math.max(60_000, Number(maxAgeMs) || 900_000)
  for (const root of outputRoots()) {
    if (!existsSync(root)) continue
    for (const sub of ['', ...subs]) {
      const dir = sub ? join(root, sub) : root
      if (!existsSync(dir)) continue
      let files = []
      try { files = readdirSync(dir) } catch { continue }
      for (const file of files) {
        if (!isStudioOutputName(file, sub, names)) continue
        const path = join(dir, file)
        try {
          const st = statSync(path)
          if (st.isDirectory() || st.mtimeMs > cutoff) continue
        } catch {
          continue
        }
        if (removeFile(path)) deleted.push(path)
      }
    }
  }
  return deleted
}

function readJson(req) {
  return new Promise((resolve) => {
    const chunks = []
    req.on('data', (chunk) => chunks.push(chunk))
    req.on('end', () => {
      try {
        resolve(JSON.parse(Buffer.concat(chunks).toString('utf8') || '{}'))
      } catch {
        resolve({})
      }
    })
    req.on('error', () => resolve({}))
  })
}

function purgeDesktopFiles(body) {
  const deleted = []
  const allowSweep = false // Never sweep another studio's files during a job cleanup.
  const names = [
    String(body?.imageName || body?.filename || ''),
    ...(Array.isArray(body?.imageNames) ? body.imageNames : [])
  ].map(name => String(name || '').trim()).filter(Boolean)
  const imageSub = String(body?.imageSubfolder || '')
  for (const imageName of names) {
    deleted.push(...removeNamedFile(inputRoots(), imageName, [imageSub, '']))
  }
  const video = body?.video || null
  const videoName = String(video?.filename || '')
  if (videoName) {
    const type = String(video?.type || 'output')
    const imageOut = /\.(png|jpe?g|webp|gif)$/i.test(videoName)
    deleted.push(...removeNamedFile(
      rootsForType(type),
      videoName,
      [video.subfolder, imageOut ? '' : 'video', ''],
      { stemSiblings: false }
    ))
  }
  const audio = body?.audio || null
  const audioName = String(audio?.filename || '')
  if (audioName) {
    deleted.push(...removeNamedFile(
      rootsForType(String(audio?.type || 'output')),
      audioName,
      [audio.subfolder, 'audio', ''],
      { stemSiblings: false }
    ))
  }
  const output = body?.output || null
  const outputName = String(output?.filename || '')
  if (outputName) {
    deleted.push(...removeNamedFile(
      rootsForType(String(output?.type || 'output')),
      outputName,
      [output.subfolder, 'image', 'still', ''],
      { stemSiblings: false }
    ))
  }
  if (allowSweep) {
    deleted.push(...sweepStaleStudioInputs(body?.sweepMaxAgeMs))
    deleted.push(...sweepStaleStudioOutputs(body?.sweepPrefixes, body?.sweepSubfolders, body?.sweepMaxAgeMs))
  }
  const unique = [...new Set(deleted)]
  console.log(JSON.stringify({
    src: 'comfy-host-agent',
    event: 'purge',
    deleted: unique.length,
    files: unique.map((path) => basename(path)),
    imageNames: names,
    video: videoName || null,
    audio: audioName || null,
    output: outputName || null,
    sweep: allowSweep
  }))
  return { ok: true, deleted: unique }
}

const gpuReservation = createGpuReservation({ idle: async () => {
  if (yueGp.busy() || yue2.busy() || upscale.busy()) return false
  if ((await trainingLock()).busy) return false
  const healthy = await syncProxy()
  if (healthy) {
    const queue = await fetchLocalQueue(healthy)
    return queue.ok && queue.running === 0 && queue.pending === 0
  }
  // A stopped service may be reserved before waking; a silent live process may not.
  return !(await processUp()) && !(await pythonMainUp().catch(() => true))
} })

const yueGp = createYueGpHost({
  leaseValid: lease => gpuReservation.isOwner(lease),
  prepare: async () => {
    if ((await trainingLock()).busy) throw new Error('GPU is busy with training.')
    if (yue2.busy()) throw new Error('YuE2 is using the GPU.')
    const healthy = await syncProxy()
    if (healthy) {
      const queue = await fetchLocalQueue(healthy)
      if (!queue.ok || queue.running || queue.pending) throw new Error('Comfy is busy; YuEGP cannot start.')
      await stopComfyProcesses()
      markAsleep()
    }
    if (await pythonMainUp()) throw new Error('Comfy has not stopped; retry after the GPU is free.')
  }
})

const yue2 = createYue2Host({
  leaseValid: lease => gpuReservation.isOwner(lease),
  prepare: async () => {
    if ((await trainingLock()).busy) throw new Error('GPU is busy with training.')
    if (yueGp.busy()) throw new Error('YuEGP is using the GPU.')
    const healthy = await syncProxy()
    if (healthy) {
      const queue = await fetchLocalQueue(healthy)
      if (!queue.ok || queue.running || queue.pending) throw new Error('Comfy is busy; YuE2 cannot start.')
    }
    // Same gate as YuEGP: stop Comfy and refuse to launch while its Python still owns VRAM.
    if (healthy || await processUp() || await pythonMainUp().catch(() => false)) {
      await stopComfyProcesses()
      markAsleep()
    }
    if (await pythonMainUp()) throw new Error('Comfy has not stopped; retry after the GPU is free.')
  }
})

const upscale = createUpscaleHost({ leaseValid: token => gpuReservation.isOwner(token) })

async function handleControl(req, res) {
  if (!authorized(req)) return json(res, 401, { ok: false, error: 'unauthorized' })
  const url = new URL(req.url || '/', 'http://localhost')
  if (url.pathname.startsWith('/upscale/')) {
    const match = url.pathname.match(/^\/upscale\/jobs\/([a-zA-Z0-9-]{12,80})(\/input|\/video|\/cancel)?$/)
    if (req.method === 'POST' && url.pathname === '/upscale/jobs') return json(res, 200, upscale.start(await readJson(req), String(req.headers['x-aigen-gpu-lease'] || '')))
    if (match && req.method === 'PUT' && match[2] === '/input') { await upscale.upload(match[1], req); return json(res, 200, { uploaded: true }) }
    if (match && req.method === 'POST' && match[2] === '/cancel') return json(res, 200, await upscale.cancel(match[1]))
    if (match && req.method === 'GET' && match[2] === '/video') { const path = upscale.output(match[1]); return path ? streamFile(res, path) : json(res, 404, { error: 'Video not ready' }) }
    if (match && req.method === 'GET' && !match[2]) { const job = upscale.read(match[1]); return json(res, job ? 200 : 404, job || { error: 'Upscale job not found' }) }
    return json(res, 404, { error: 'Unknown upscale endpoint' })
  }
  if (url.pathname.startsWith('/yuegp/')) {
    const match = url.pathname.match(/^\/yuegp\/jobs\/([a-zA-Z0-9-]{12,80})(\/audio|\/cancel)?$/)
    if (req.method === 'GET' && url.pathname === '/yuegp/status') return json(res, 200, { configured: yueGp.configured(), busy: yueGp.busy(), backend: 'yuegp' })
    if (req.method === 'POST' && url.pathname === '/yuegp/jobs') return json(res, 200, await yueGp.start(await readJson(req), String(req.headers['x-aigen-gpu-lease'] || '')))
    if (match && req.method === 'POST' && match[2] === '/cancel') return json(res, 200, await yueGp.cancel(match[1]))
    if (match && req.method === 'GET' && match[2] === '/audio') {
      const path = yueGp.audio(match[1])
      return path ? streamFile(res, path) : json(res, 404, { error: 'Audio not ready' })
    }
    if (match && req.method === 'GET' && !match[2]) {
      const job = yueGp.read(match[1])
      return json(res, job ? 200 : 404, job || { error: 'YuEGP job not found' })
    }
    return json(res, 404, { error: 'Unknown YuEGP endpoint' })
  }
  if (url.pathname.startsWith('/yue2/')) {
    if (yueGp.busy()) return json(res, 409, { message: 'YuEGP is using the GPU.' })
    const match = url.pathname.match(/^\/yue2\/jobs\/([a-zA-Z0-9-]{12,80})(\/audio|\/cancel)?$/)
    if (req.method === 'GET' && url.pathname === '/yue2/status') return json(res, 200, { configured: yue2.configured(), busy: yue2.busy(), backend: 'yue2' })
    if (req.method === 'POST' && url.pathname === '/yue2/jobs') return json(res, 200, await yue2.start(await readJson(req), String(req.headers['x-aigen-gpu-lease'] || '')))
    if (match && req.method === 'POST' && match[2] === '/cancel') return json(res, 200, await yue2.cancel(match[1]))
    if (match && req.method === 'GET' && match[2] === '/audio') {
      const path = yue2.audio(match[1])
      return path ? streamFile(res, path) : json(res, 404, { error: 'Audio not ready' })
    }
    if (match && req.method === 'GET' && !match[2]) {
      const job = yue2.read(match[1])
      return json(res, job ? 200 : 404, job || { error: 'YuE2 job not found' })
    }
    return json(res, 404, { error: 'Unknown YuE2 endpoint' })
  }
  if (req.method === 'POST' && url.pathname.startsWith('/gpu/')) {
    const body = await readJson(req)
    let result
    if (url.pathname === '/gpu/acquire') result = await gpuReservation.acquire(body.ticket)
    else if (url.pathname === '/gpu/renew') result = await gpuReservation.renew(body.token)
    else if (url.pathname === '/gpu/release') result = await gpuReservation.release(body.token)
    else if (url.pathname === '/gpu/cancel') result = await gpuReservation.cancel(body.ticket)
    else return json(res, 404, { ok: false })
    return json(res, 200, result)
  }
  if (req.method === 'GET' && url.pathname === '/status') {
    // Answer immediately. MyMonitor allows ~500ms; probing ports + WMI here
    // made the A light stay red even while this process was running.
    // Do not treat a stale proxyTarget as proof Comfy is up — that made
    // /status report asleep+http at once, so training skipped /stop.
    const healthyPort = lastHealthyPort || 0
    const processUpNow = Boolean(lastProcessUp && healthyPort)
    const asleep = !healthyPort && !processUpNow
    if (!asleep) stoppedByAgent = false
    return json(res, 200, {
      ok: true,
      http: Boolean(healthyPort),
      process: processUpNow,
      processUp: processUpNow,
      asleep,
      lastActivityAt: new Date(lastWorkAt).toISOString(),
      idleMs,
      port: healthyPort || null,
      proxyPort,
      gpu: gpuReservation.availability(),
      training: { busy: lastTraining.busy },
      yuegp: { busy: yueGp.busy(), configured: yueGp.configured() },
      yue2: { busy: yue2.busy(), configured: yue2.configured() },
      upscale: { busy: upscale.busy(), engine: 'realesrgan-rife', local: true }
    })
  }
  if (req.method === 'POST' && url.pathname === '/start') {
    if (upscale.busy()) return json(res, 409, { message: 'Local upscale is using the GPU.' })
    if (yueGp.busy()) return json(res, 409, { message: 'YuEGP is using the GPU.' })
    if (yue2.busy()) return json(res, 409, { message: 'YuE2 is using the GPU.' })
    const training = await trainingLock()
    if (training.busy) {
      return json(res, 409, {
        ok: false,
        error: 'train-busy',
        message: training.message,
        training
      })
    }
    const healthyPort = await syncProxy()
    if (healthyPort) {
      markWork()
      return json(res, 200, { ok: true, started: false, already: true, asleep: false, port: healthyPort, proxyPort })
    }
    const listenPort = desktopListenPort()
    // Do not trust lastProcessUp alone — force-stop can leave it sticky while Comfy is dead.
    const processAlive = await processUp().catch(() => false) || await pythonMainUp().catch(() => false)
    const portBusy = await portInUse(listenPort)
    if (processAlive || portBusy) {
      markWork()
      lastProcessUp = true
      if (portBusy) setProxyTarget(listenPort)
      return json(res, 200, {
        ok: true,
        started: false,
        already: true,
        booting: true,
        asleep: false,
        port: portBusy ? listenPort : null,
        proxyPort
      })
    }
    // Only honor launch cooldown if we actually spawned recently; never block a real cold start.
    if (lastLaunchAt && Date.now() - lastLaunchAt < 45_000 && await processUp().catch(() => false)) {
      return json(res, 200, { ok: true, started: false, already: true, booting: true, asleep: false, proxyPort })
    }
    stoppedByAgent = false
    probeSkipUntil.clear()
    lastLaunchAt = Date.now()
    const launched = await startComfy()
    if (launched.port) {
      lastProcessUp = true
      setProxyTarget(launched.port)
    }
    return json(res, 200, { ok: true, asleep: false, proxyPort, ...launched })
  }
  if (req.method === 'POST' && url.pathname === '/stop') {
    const body = await readJson(req).catch(() => ({}))
    const force = body?.force === true || url.searchParams.get('force') === '1'
    const healthyPort = await syncProxy()
    const queue = healthyPort ? await fetchLocalQueue(healthyPort) : { running: 0, pending: 0, ok: false }
    if (!force && queue.ok && (queue.running > 0 || queue.pending > 0)) {
      return json(res, 409, {
        ok: false,
        error: 'queue-busy',
        running: queue.running,
        pending: queue.pending
      })
    }
    if (force && healthyPort) {
      try {
        await fetch(`http://127.0.0.1:${healthyPort}/interrupt`, { method: 'POST', signal: AbortSignal.timeout(4000) })
      } catch { /* ignore */ }
    }
    const killed = await stopComfyProcesses()
    markAsleep()
    console.log(JSON.stringify({ src: 'comfy-host-agent', event: 'stopped', reason: force ? 'force-stop' : 'stop', killed, queue }))
    return json(res, 200, { ok: true, stopped: true, asleep: true, killed, forced: force })
  }
  if (req.method === 'GET' && url.pathname === '/view') {
    const filename = String(url.searchParams.get('filename') || '')
    const subfolder = String(url.searchParams.get('subfolder') || '')
    const type = String(url.searchParams.get('type') || 'output')
    const path = findOutputFile(filename, subfolder, type)
    if (!path) return json(res, 404, { ok: false, error: 'not-found', filename, subfolder, type })
    markWork()
    return streamFile(res, path)
  }
  if (req.method === 'POST' && url.pathname === '/studio2/purge') {
    if (!gpuReservation.isOwner(String(req.headers['x-aigen-gpu-lease'] || ''))) return json(res, 409, { ok: false, error: 'GPU lease required' })
    const body = await readJson(req)
    try { return json(res, 200, purgeStudio2Files(body, rootsForType)) }
    catch (error) { return json(res, 400, { ok: false, error: String(error.message || error) }) }
  }
  if (req.method === 'POST' && url.pathname === '/purge') {
    const body = await readJson(req)
    return json(res, 200, purgeDesktopFiles(body))
  }
  if (req.method === 'POST' && url.pathname === '/sweep') return json(res, 409, { ok: false, message: 'Global cleanup is disabled while studios share the GPU.' })
  json(res, 404, { ok: false, error: 'not found' })
}

const server = http.createServer(async (req, res) => {
  if (!authorized(req)) return json(res, 401, { ok: false, error: 'unauthorized' })
  try {
    const path = new URL(req.url || '/', 'http://localhost').pathname
    if (['POST', 'PUT'].includes(req.method) && !path.startsWith('/gpu/')) {
      await gpuReservation.permit(String(req.headers['x-aigen-gpu-lease'] || ''), () => handleControl(req, res))
    } else await handleControl(req, res)
  } catch (error) {
    req.resume()
    if ((String(req.url || '').startsWith('/yuegp/') || String(req.url || '').startsWith('/yue2/') || String(req.url || '').startsWith('/upscale/')) && !res.headersSent) return json(res, error.statusCode || 400, { error: error.message || 'Music host request failed' })
    if (!res.headersSent) json(res, error.statusCode || 400, { ok: false, message: error.statusCode === 409 ? 'GPU is in use. Waiting for availability.' : 'GPU coordination request failed.' })
  }
})

function logStartupSweep() {
  // Disabled: sweeping studio outputs on agent start was deleting Comfy
  // files that are still part of the generation / recover workflow.
}

server.listen(port, '0.0.0.0', async () => {
  ensureProxyListening()
  lastHealthyPort = await syncProxy() || 0
  lastProcessUp = Boolean(lastHealthyPort) || await processUp().catch(() => false)
  if (lastHealthyPort) await noteQueue(lastHealthyPort)
  logStartupSweep()
  console.log(JSON.stringify({
    src: 'comfy-host-agent',
    event: 'listen',
    port,
    proxyPort,
    comfyPort: lastHealthyPort || null,
    idleMs,
    candidates: candidatePorts()
  }))
  void trainingLock()
  setInterval(() => { void trainingLock() }, 3000)
  let lastIdleCheck = 0
  setInterval(() => {
    syncProxy().then(async (nextPort) => {
      lastHealthyPort = nextPort || 0
      const now = Date.now()
      if (now - lastIdleCheck < 10_000) return
      lastIdleCheck = now
      await maybeIdleStop(nextPort)
      lastProcessUp = Boolean(nextPort) || await processUp().catch(() => false)
    }).catch(() => {})
  }, 3000)
})