import { existsSync, mkdirSync, readdirSync, readFileSync, renameSync, writeFileSync } from 'node:fs'
import { join } from 'node:path'
import { getJob, listJobs, emitJob, type Job } from '~/server/utils/jobs'
import { listPendingJobs, patchPendingJob, readPendingJob, deletePendingJob } from '~/server/utils/pending'
import { getShotQueue } from '~/server/utils/shotQueue'
import { fetchLiveQueue } from '~/server/utils/comfy'
import { isLtxWorkflow, isTextToVideo, LTX_DISABLED_MESSAGE, ltxWorkflowEnabled, parseVideoWorkflow, type VideoWorkflowId } from '~/utils/videoModels'
import { persistLoraFields } from '~/server/utils/loras'
import { resolveLoraStack } from '~/utils/loras'
import { allowIdentityRefs } from '~/utils/globalLocks'

export type StudioJobStatus = 'waiting' | 'running' | 'held' | 'complete' | 'error' | 'cancelled'
export type StudioJobKind = 'video' | 'edit'

export interface StudioJobPayload {
  prompt: string
  name: string
  folderId: string
  aspect: string
  width: number
  height: number
  steps: number
  turbo: boolean
  seed: number
  cfg: number
  fps: number
  samplerName: string
  scheduler: string
  duration: number
  sound: boolean
  workflow: VideoWorkflowId
  useIdentityRefs: boolean
  stillId?: string
  stillFilename?: string
  hideThumbnail: boolean
  hideInput?: boolean
  folderLocked?: boolean
  referenceStillIds: Array<string | null>
  extensions: { prompt: string; duration: number; permanenceRefs?: PermanenceRef[]; loraName?: string; loraStack?: import('~/utils/loras').LoraStackItem[] }[]
  queueAutoRun: boolean
  globalLocks?: string
  permanenceRefs?: PermanenceRef[]
  shotPermanenceRefs?: PermanenceRef[][]
  loraName?: string
  loraStack?: import('~/utils/loras').LoraStackItem[]
  shotLoras?: string[]
  shotLoraStacks?: import('~/utils/loras').LoraStackItem[][]
  negative?: string
  passes?: { prompt: string }[]
  referenceStillId?: string
  referenceStillFilename?: string
  scaleToTotalPixels?: boolean
  scaleMegapixels?: number
  imagePipeline?: 'v1' | 'v2'
  v2Mode?: 'edit' | 'compose' | 'refine' | 'generate'
  v2Task?: 'scene' | 'identity' | 'outfit' | 'face_lock' | 'refine' | 't2i'
  snofsModel?: number
  snofsClip?: number
  consistencyModel?: number
  consistencyClip?: number
  maskStillId?: string
  maskStillFilename?: string
  refineStrength?: number
}

export interface StudioJob {
  id: string
  ownerKey: string
  createdAt: number
  updatedAt: number
  status: StudioJobStatus
  kind: StudioJobKind
  name: string
  prompt: string
  shotCount: number
  familyId: string
  shotQueueId?: string
  liveJobId?: string
  payload: StudioJobPayload
  cutIn?: boolean
  holdForCutIn?: boolean
  pauseAfterCurrent?: boolean
  pausedByUser?: boolean
  resumeAutoRun?: boolean
  lastError?: string
}

type StudioQueueStore = {
  paused: boolean
  jobs: StudioJob[]
}

const writeChains = new Map<string, Promise<unknown>>()
let dispatchChain: Promise<unknown> = Promise.resolve()

function libraryRoot() {
  const config = useRuntimeConfig()
  return (config.libraryDir || process.env.LIBRARY_DIR || '/data/library').replace(/\/$/, '')
}

function queuePath(owner: string) {
  return join(libraryRoot(), 'users', owner, 'studio-queue.json')
}

function ensureOwner(owner: string) {
  mkdirSync(join(libraryRoot(), 'users', owner), { recursive: true })
}

function readStore(owner: string): StudioQueueStore {
  ensureOwner(owner)
  const path = queuePath(owner)
  if (!existsSync(path)) return { paused: false, jobs: [] }
  try {
    const parsed = JSON.parse(readFileSync(path, 'utf8'))
    if (Array.isArray(parsed)) return { paused: false, jobs: parsed }
    if (parsed && typeof parsed === 'object') {
      return {
        paused: parsed.paused === true,
        jobs: Array.isArray(parsed.jobs) ? parsed.jobs : []
      }
    }
    return { paused: false, jobs: [] }
  } catch {
    return { paused: false, jobs: [] }
  }
}

function writeStore(owner: string, store: StudioQueueStore) {
  ensureOwner(owner)
  const path = queuePath(owner)
  const tmp = `${path}.tmp`
  writeFileSync(tmp, JSON.stringify({
    paused: store.paused === true,
    jobs: store.jobs
  }, null, 2))
  renameSync(tmp, path)
}

function readJobs(owner: string): StudioJob[] {
  return readStore(owner).jobs
}

function mutate<T>(owner: string, fn: (jobs: StudioJob[]) => T): Promise<T> {
  const prev = writeChains.get(owner) || Promise.resolve()
  const run = prev.then(() => {
    const store = readStore(owner)
    const result = fn(store.jobs)
    writeStore(owner, store)
    return result
  })
  writeChains.set(owner, run.then(() => undefined, () => undefined))
  return run
}

function mutateStore<T>(owner: string, fn: (store: StudioQueueStore) => T): Promise<T> {
  const prev = writeChains.get(owner) || Promise.resolve()
  const run = prev.then(() => {
    const store = readStore(owner)
    const result = fn(store)
    writeStore(owner, store)
    return result
  })
  writeChains.set(owner, run.then(() => undefined, () => undefined))
  return run
}

function jobIsUserPaused(job: StudioJob) {
  return job.pauseAfterCurrent === true || job.pausedByUser === true
}

function syncPausedFlag(store: StudioQueueStore) {
  store.paused = store.jobs.some(jobIsUserPaused)
}

function migrateGlobalPause(store: StudioQueueStore) {
  const anyJobFlag = store.jobs.some(jobIsUserPaused)
  if (store.paused && !anyJobFlag) {
    for (const job of store.jobs) {
      if (job.status === 'running') job.pauseAfterCurrent = true
      else if (job.status === 'held' && !job.holdForCutIn) job.pausedByUser = true
    }
  }
  syncPausedFlag(store)
}

export function isStudioQueuePaused(owner: string) {
  const store = readStore(owner)
  return store.jobs.some(jobIsUserPaused)
}

export function listOwnersWithStudioQueues() {
  const root = join(libraryRoot(), 'users')
  if (!existsSync(root)) return [] as string[]
  return readdirSync(root, { withFileTypes: true })
    .filter(entry => entry.isDirectory())
    .map(entry => entry.name)
    .filter(owner => existsSync(queuePath(owner)))
}

export function listStudioJobs(owner: string) {
  return readJobs(owner)
}

export function studioJobKind(job: Pick<StudioJob, 'kind'> | { kind?: string }) {
  return job.kind === 'edit' ? 'edit' : 'video'
}

export function summarizeStudioJob(job: StudioJob) {
  return {
    id: job.id,
    createdAt: job.createdAt,
    updatedAt: job.updatedAt,
    status: job.status,
    kind: studioJobKind(job),
    name: job.name,
    prompt: job.prompt,
    shotCount: job.shotCount,
    familyId: job.familyId,
    shotQueueId: job.shotQueueId,
    liveJobId: job.liveJobId,
    stillId: job.payload.stillId,
    workflow: job.payload.workflow,
    imagePipeline: job.payload.imagePipeline || 'v1',
    duration: job.payload.duration,
    hideThumbnail: job.payload.hideThumbnail,
    folderLocked: job.payload.folderLocked === true,
    queueAutoRun: job.payload.queueAutoRun === true,
    cutIn: job.cutIn === true,
    holdForCutIn: job.holdForCutIn === true,
    pauseAfterCurrent: job.pauseAfterCurrent === true,
    pausedByUser: job.pausedByUser === true,
    lastError: job.lastError
  }
}

const QUEUED_GRACE_MS = 4 * 60 * 1000
const SUBMIT_WINDOW_MS = 45 * 1000
const PENDING_ORPHAN_MS = 2 * 60 * 1000

function jobAgeMs(job: { startedAt: number }) {
  return Date.now() - job.startedAt
}

/** Uploading, or created just now and not yet on Comfy. Paused leftovers do not count. */
export function jobIsLocallySubmitting(job: Job) {
  if (job.library?.stopAfterCurrent) return false
  if (job.status === 'uploading') return true
  if (job.status === 'queued' && !job.promptId && jobAgeMs(job) < SUBMIT_WINDOW_MS) return true
  if (job.status === 'running' && !job.promptId && jobAgeMs(job) < SUBMIT_WINDOW_MS) return true
  return false
}

function sweepStaleLiveJobs() {
  const now = Date.now()
  for (const job of listJobs()) {
    if (job.status !== 'queued') continue
    if (job.promptId) continue
    if (now - job.startedAt < QUEUED_GRACE_MS) continue
    job.status = 'error'
    job.error = job.error || 'Job never started'
  }
}

export async function videoJobsBusy() {
  sweepStaleLiveJobs()
  if (listJobs().some(jobIsLocallySubmitting)) return true
  const queue = await fetchLiveQueue()
  if (queue) return queue.running > 0 || queue.pending > 0
  return listJobs().some((job) => {
    if (job.library?.stopAfterCurrent) return false
    if (job.status === 'uploading' || job.status === 'running') return true
    if (job.status === 'queued') return jobAgeMs(job) < SUBMIT_WINDOW_MS
    return false
  }) || listPendingJobs().some((pending) => {
    if (!pending.promptId || pending.stopAfterCurrent) return false
    const live = getJob(pending.jobId)
    if (live) return jobIsLocallySubmitting(live) || live.status === 'running' || live.status === 'uploading'
    return Date.now() - pending.startedAt < PENDING_ORPHAN_MS
  })
}

export function applyPersistedPauseToJob(job: Job) {
  const library = job.library
  if (!library) return false
  const store = readStore(library.ownerKey)
  const row = store.jobs.find(item => item.liveJobId === job.id)
    || (library.queueId ? store.jobs.find(item => item.shotQueueId === library.queueId) : undefined)
  const queue = library.queueId ? getShotQueue(library.ownerKey, library.queueId) : null
  const paused = row?.pauseAfterCurrent === true
    || row?.pausedByUser === true
    || queue?.stopAfterCurrent === true
  if (paused) {
    library.stopAfterCurrent = true
    library.queueAutoRun = false
  }
  return paused
}

export async function addStudioJob(params: {
  ownerKey: string
  payload: StudioJobPayload
  familyId: string
  kind?: StudioJobKind
}) {
  const now = Date.now()
  const kind = params.kind === 'edit' ? 'edit' : 'video'
  const shotCount = kind === 'edit'
    ? 1 + (params.payload.passes?.length || 0)
    : 1 + (params.payload.extensions?.length || 0)
  const job: StudioJob = {
    id: crypto.randomUUID(),
    ownerKey: params.ownerKey,
    createdAt: now,
    updatedAt: now,
    status: 'waiting',
    kind,
    name: (params.payload.name || '').trim() || params.payload.prompt.slice(0, 80),
    prompt: params.payload.prompt,
    shotCount,
    familyId: params.familyId,
    payload: params.payload,
    cutIn: false
  }
  await mutate(params.ownerKey, (jobs) => {
    jobs.push(job)
    return job
  })
  return job
}

export async function patchStudioJob(owner: string, id: string, patch: (job: StudioJob) => void) {
  return mutate(owner, (jobs) => {
    const job = jobs.find(item => item.id === id)
    if (!job) throw createError({ statusCode: 404, statusMessage: 'Queued job not found' })
    patch(job)
    job.updatedAt = Date.now()
    return structuredClone(job)
  })
}

export async function cancelStudioJob(owner: string, id: string) {
  const before = readJobs(owner).find(item => item.id === id)
  if (!before) throw createError({ statusCode: 404, statusMessage: 'Queued job not found' })
  if (before.status !== 'waiting' && before.status !== 'held' && before.status !== 'running') {
    throw createError({ statusCode: 409, statusMessage: 'That job is no longer in the queue' })
  }
  const stopLive = before.status === 'running'
  const liveJobId = before.liveJobId
  const shotQueueId = before.shotQueueId

  const result = await mutateStore(owner, (store) => {
    const job = store.jobs.find(item => item.id === id)
    if (!job) throw createError({ statusCode: 404, statusMessage: 'Queued job not found' })
    if (job.status !== 'waiting' && job.status !== 'held' && job.status !== 'running') {
      throw createError({ statusCode: 409, statusMessage: 'That job is no longer in the queue' })
    }
    job.status = 'cancelled'
    job.cutIn = false
    job.holdForCutIn = false
    job.pauseAfterCurrent = false
    job.pausedByUser = false
    job.liveJobId = undefined
    job.updatedAt = Date.now()
    const stillCutIn = store.jobs.some(item => item.status === 'waiting' && item.cutIn)
    if (!stillCutIn) {
      for (const item of store.jobs) {
        if (item.status === 'running' || item.status === 'held') {
          item.holdForCutIn = false
        }
      }
    }
    syncPausedFlag(store)
    return structuredClone(job)
  })
  if (stopLive) {
    await stopLiveGeneration(liveJobId, shotQueueId)
  }
  if (result.shotQueueId) {
    const { deleteShotQueue, setQueueJob } = await import('~/server/utils/shotQueue')
    setQueueJob(result.shotQueueId, null)
    await deleteShotQueue(owner, result.shotQueueId, { force: true }).catch(() => null)
  }
  const jobs = readJobs(owner)
  if (!jobs.some(item => item.status === 'waiting' && item.cutIn)) {
    const running = jobs.find(item => item.status === 'running')
    if (running?.liveJobId) {
      const live = getJob(running.liveJobId)
      if (live?.library) live.library.stopAfterCurrent = false
    }
  }
  kickStudioQueue()
  return result
}

async function stopLiveGeneration(liveJobId?: string, shotQueueId?: string) {
  if (shotQueueId) {
    const { setQueueJob, pauseShotQueue } = await import('~/server/utils/shotQueue')
    setQueueJob(shotQueueId, null)
    const live = liveJobId ? getJob(liveJobId) : undefined
    if (live?.library?.ownerKey) {
      await pauseShotQueue(live.library.ownerKey, shotQueueId).catch(() => null)
    }
  }
  if (!liveJobId) return
  const live = getJob(liveJobId)
  if (live) {
    live.status = 'cancelled'
    if (live.library) {
      live.library.stopAfterCurrent = true
      live.library.queueAutoRun = false
    }
    emitJob(live, { type: 'error', error: 'Job interrupted.', message: 'Job interrupted.' })
  }
  deletePendingJob(liveJobId)
  const { interruptComfy } = await import('~/server/utils/comfy')
  await interruptComfy().catch(() => false)
}

export async function cancelOrphanQueue(owner: string, queueId: string) {
  const { getShotQueue, getQueueJobId, queueIsProcessing, deleteShotQueue } = await import('~/server/utils/shotQueue')
  const queue = getShotQueue(owner, queueId)
  if (!queue) throw createError({ statusCode: 404, statusMessage: 'Queue not found' })
  const generating = queue.status === 'running' || queueIsProcessing(queueId)
  const liveJobId = getQueueJobId(queueId) || queue.currentJobId
  if (generating) {
    await stopLiveGeneration(liveJobId, queueId)
  }
  await deleteShotQueue(owner, queueId, { force: true }).catch(() => null)
  kickStudioQueue()
  return { ok: true }
}

export async function requestCutIn(owner: string, id: string) {
  const jobsNow = readJobs(owner)
  const running = jobsNow.find(job => job.status === 'running')
    || jobsNow.find(job => job.status === 'held')
  const target = jobsNow.find(job => job.id === id)
  if (!target) throw createError({ statusCode: 404, statusMessage: 'Queued job not found' })
  if (target.status !== 'waiting') {
    throw createError({ statusCode: 409, statusMessage: 'Only a waiting job can cut in' })
  }
  if (running?.id === id) {
    throw createError({ statusCode: 409, statusMessage: 'That job is already running' })
  }
  const updated = await mutate(owner, (jobs) => {
    const job = jobs.find(item => item.id === id)
    if (!job) throw createError({ statusCode: 404, statusMessage: 'Queued job not found' })
    if (job.status !== 'waiting') {
      throw createError({ statusCode: 409, statusMessage: 'Only a waiting job can cut in' })
    }
    job.cutIn = true
    job.updatedAt = Date.now()
    for (const item of jobs) {
      if (item.id !== id && item.status === 'waiting') item.cutIn = false
    }
    const active = running ? jobs.find(item => item.id === running.id) : undefined
    if (active && active.status === 'running') {
      active.holdForCutIn = true
      active.resumeAutoRun = active.payload.queueAutoRun === true
      active.updatedAt = Date.now()
    }
    return structuredClone(job)
  })
  if (running?.liveJobId) {
    const live = getJob(running.liveJobId)
    if (live?.library) {
      live.library.stopAfterCurrent = true
    }
  }
  await kickStudioQueue()
  return updated
}

function pruneDone(jobs: StudioJob[]) {
  const cutoff = Date.now() - 1000 * 60 * 60 * 24
  return jobs.filter(job => {
    if (job.status === 'waiting' || job.status === 'running' || job.status === 'held') return true
    return job.updatedAt > cutoff
  }).slice(-40)
}

export async function markStudioLive(owner: string, id: string, liveJobId: string, shotQueueId?: string) {
  return patchStudioJob(owner, id, (job) => {
    job.status = 'running'
    job.liveJobId = liveJobId
    if (shotQueueId) job.shotQueueId = shotQueueId
    job.lastError = undefined
  })
}

export async function markStudioHeld(owner: string, id: string) {
  return patchStudioJob(owner, id, (job) => {
    job.status = 'held'
    job.liveJobId = undefined
  })
}

export async function markStudioSettled(owner: string, liveJobId: string, status: 'complete' | 'error' | 'cancelled', error?: string) {
  return mutate(owner, (jobs) => {
    const job = jobs.find(item => item.liveJobId === liveJobId)
    if (!job) return null
    if (job.holdForCutIn && status === 'complete') {
      job.status = 'held'
      job.liveJobId = undefined
      job.updatedAt = Date.now()
      return structuredClone(job)
    }
    job.status = status
    job.liveJobId = undefined
    job.cutIn = false
    job.holdForCutIn = false
    job.lastError = error
    job.updatedAt = Date.now()
    return structuredClone(job)
  })
}

function pickCutIn(jobs: StudioJob[]) {
  return jobs.find(job => job.status === 'waiting' && job.cutIn) || null
}

function pickHeld(jobs: StudioJob[]) {
  return jobs
    .filter(job => (
      job.status === 'held'
      && job.shotQueueId
      && job.holdForCutIn
      && !job.pausedByUser
    ))
    .sort((a, b) => b.updatedAt - a.updatedAt)[0] || null
}

function pickWaiting(jobs: StudioJob[]) {
  const waiting = jobs.filter(job => job.status === 'waiting')
  if (!waiting.length) return null
  if (jobs.some(job => job.pausedByUser === true)) {
    return waiting.reduce((latest, job) => job.createdAt >= latest.createdAt ? job : latest)
  }
  return waiting[0] || null
}

export function kickStudioQueue() {
  const run = dispatchChain.then(() => dispatchStudioQueue()).catch(() => undefined)
  dispatchChain = run
  return run
}

let kickRetryTimer: ReturnType<typeof setTimeout> | null = null
function scheduleKickRetry() {
  if (kickRetryTimer) return
  kickRetryTimer = setTimeout(() => {
    kickRetryTimer = null
    kickStudioQueue()
  }, 2500)
}

function pendingAlive(job: StudioJob) {
  if (job.liveJobId && readPendingJob(job.liveJobId)?.promptId) return true
  if (!job.shotQueueId) return false
  return listPendingJobs().some(pending => (
    pending.ownerKey === job.ownerKey
    && pending.queueId === job.shotQueueId
    && Boolean(pending.promptId)
  ))
}

function repairStaleJobs(jobs: StudioJob[]) {
  for (const job of jobs) {
    if (job.status === 'error' && /allowIdentityRefs is not defined/i.test(String(job.lastError || ''))) {
      job.status = 'waiting'
      job.liveJobId = undefined
      job.lastError = undefined
      job.updatedAt = Date.now()
      continue
    }
    if (job.status !== 'running') continue
    const live = job.liveJobId ? getJob(job.liveJobId) : undefined
    const liveBusy = live && (live.status === 'queued' || live.status === 'uploading' || live.status === 'running')
    if (liveBusy || pendingAlive(job)) continue
    const holdPause = job.pauseAfterCurrent === true || job.pausedByUser === true
    if (job.shotQueueId) {
      job.status = 'held'
      job.liveJobId = undefined
      if (holdPause) {
        job.pausedByUser = true
        job.pauseAfterCurrent = false
        job.holdForCutIn = false
      } else {
        job.holdForCutIn = true
        job.resumeAutoRun = job.payload.queueAutoRun === true || job.resumeAutoRun === true
      }
      job.updatedAt = Date.now()
    } else {
      job.status = holdPause ? 'held' : 'complete'
      job.liveJobId = undefined
      if (holdPause) {
        job.pausedByUser = true
        job.pauseAfterCurrent = false
      }
      job.updatedAt = Date.now()
    }
  }
}

async function dispatchStudioQueue() {
  sweepStaleLiveJobs()
  for (const owner of listOwnersWithStudioQueues()) {
    const store = await mutateStore(owner, (current) => {
      migrateGlobalPause(current)
      repairStaleJobs(current.jobs)
      const next = pruneDone(current.jobs)
      current.jobs.splice(0, current.jobs.length, ...next)
      syncPausedFlag(current)
      return {
        paused: current.paused === true,
        jobs: current.jobs.map(item => structuredClone(item))
      }
    })
    if (await videoJobsBusy()) {
      if (listOwnersWithStudioQueues().some(owner => readJobs(owner).some(job => job.status === 'waiting'))) {
        scheduleKickRetry()
      }
      return
    }
    const cutIn = pickCutIn(store.jobs)
    if (cutIn) {
      await startStudioJob(cutIn)
      return
    }
    const waiting = pickWaiting(store.jobs)
    if (waiting) {
      await startStudioJob(waiting)
      return
    }
    const held = pickHeld(store.jobs)
    if (held?.shotQueueId) {
      const resumed = await resumeHeldStudioJob(held)
      if (resumed) return
    }
  }
}

async function resumeHeldStudioJob(item: StudioJob) {
  if (!item.shotQueueId) {
    await patchStudioJob(item.ownerKey, item.id, (job) => {
      job.status = 'complete'
      job.holdForCutIn = false
    })
    return false
  }
  const { startQueueBurst } = await import('~/server/utils/videoChain')
  const count = item.resumeAutoRun ? 'all' as const : 1
  try {
    const started = await startQueueBurst(item.ownerKey, item.shotQueueId, count)
    await patchStudioJob(item.ownerKey, item.id, (job) => {
      job.status = 'running'
      job.liveJobId = started.jobId
      job.holdForCutIn = false
      job.cutIn = false
    })
    return true
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error)
    await patchStudioJob(item.ownerKey, item.id, (job) => {
      job.status = 'error'
      job.lastError = message
      job.holdForCutIn = false
    })
    return false
  }
}

async function startStudioEditJob(item: StudioJob) {
  let live: Job | undefined
  try {
    const { stillPath } = await import('~/server/utils/library')
    const { existsSync, readFileSync } = await import('node:fs')
    const { createEditLiveJob, runEdit } = await import('~/server/utils/imageChain')
    const { runEditV2 } = await import('~/server/utils/imageChainV2')

    const payload = item.payload
    const generate = payload.imagePipeline === 'v2' && payload.v2Mode === 'generate'
    if (!generate && (!payload.stillId || !existsSync(stillPath(item.ownerKey, payload.stillId)))) {
      throw new Error('The input still is missing from the library')
    }
    const image = payload.stillId && existsSync(stillPath(item.ownerKey, payload.stillId))
      ? {
        filename: payload.stillFilename || 'still.png',
        data: readFileSync(stillPath(item.ownerKey, payload.stillId)),
        type: 'image/png'
      }
      : null
    const refId = payload.referenceStillId
    const reference = refId && existsSync(stillPath(item.ownerKey, refId))
      ? {
        filename: payload.referenceStillFilename || 'image2.png',
        data: readFileSync(stillPath(item.ownerKey, refId)),
        type: 'image/png'
      }
      : null

    if (payload.imagePipeline === 'v2') {
      const mode = payload.v2Mode === 'compose'
        ? 'compose'
        : payload.v2Mode === 'refine'
          ? 'refine'
          : payload.v2Mode === 'generate'
            ? 'generate'
            : 'edit'
      const maskId = payload.maskStillId
      const mask = mode === 'refine' && maskId && existsSync(stillPath(item.ownerKey, maskId))
        ? {
          filename: payload.maskStillFilename || 'refine-mask.png',
          data: readFileSync(stillPath(item.ownerKey, maskId)),
          type: 'image/png'
        }
        : null
      if (mode === 'refine' && !mask) {
        throw new Error('Refine requires a mask. Refusing to fall back to Edit.')
      }
      if (mode === 'compose' && !reference) {
        throw new Error('Compose requires image B. Refusing to fall back to one-image generation.')
      }
      if (mode === 'edit' && reference) {
        throw new Error('Edit mode takes one image. Use Compose for two stills.')
      }
      live = createEditLiveJob({
        steps: payload.steps,
        hideThumbnail: payload.hideThumbnail,
        library: {
          ownerKey: item.ownerKey,
          folderId: payload.folderId,
          hideThumbnail: payload.hideThumbnail,
          hideInput: payload.hideInput,
          folderLocked: payload.folderLocked,
          name: payload.name,
          prompt: payload.prompt,
          aspect: payload.aspect || 'auto',
          width: payload.width,
          height: payload.height,
          steps: payload.steps,
          turbo: payload.turbo === true,
          seed: payload.seed || Math.floor(Math.random() * 2_147_483_647),
          cfg: payload.cfg,
          stillId: payload.stillId,
          stillFilename: payload.stillFilename,
          familyId: item.familyId,
          chainIndex: 0,
          chainStep: 1,
          chainTotal: 1
        }
      })
      await markStudioLive(item.ownerKey, item.id, live.id)
      void runEditV2(live, {
        mode,
        task: payload.v2Task || 'scene',
        image: mode === 'generate' ? null : image,
        reference: mode === 'refine' || mode === 'generate' ? null : reference,
        mask,
        prompt: payload.prompt,
        negative: payload.negative || '',
        steps: payload.steps,
        seed: live.library?.seed || payload.seed,
        cfg: payload.cfg,
        snofsModel: payload.snofsModel ?? 0.65,
        snofsClip: payload.snofsClip ?? 0.35,
        consistencyModel: payload.consistencyModel ?? (mode === 'generate' ? 0 : 0.7),
        consistencyClip: payload.consistencyClip ?? (mode === 'generate' ? 0 : 0.7),
        megapixels: payload.scaleMegapixels ?? 1,
        strength: payload.refineStrength,
        width: payload.width,
        height: payload.height,
        turbo: payload.turbo === true,
        sourceStillId: payload.stillId,
        referenceStillId: payload.referenceStillId
      }).catch((error) => {
        const message = error instanceof Error ? error.message : String(error)
        if (live && live.status !== 'error' && live.status !== 'cancelled' && live.status !== 'deferred') {
          live.status = 'error'
          live.error = message
        }
      })
      return
    }

    const passes = payload.passes || []
    live = createEditLiveJob({
      steps: payload.steps,
      hideThumbnail: payload.hideThumbnail,
      library: {
        ownerKey: item.ownerKey,
        folderId: payload.folderId,
        hideThumbnail: payload.hideThumbnail,
        hideInput: payload.hideInput,
        folderLocked: payload.folderLocked,
        name: payload.name,
        prompt: payload.prompt,
        aspect: payload.aspect || 'auto',
        width: payload.width,
        height: payload.height,
        steps: payload.steps,
        turbo: true,
        seed: payload.seed || Math.floor(Math.random() * 2_147_483_647),
        cfg: payload.cfg,
        stillId: payload.stillId,
        stillFilename: payload.stillFilename,
        familyId: item.familyId,
        chainIndex: 0,
        chainStep: 1,
        chainTotal: 1 + passes.length,
        chainLabel: passes.length ? 'Pass 1' : undefined,
        passes,
        ...persistLoraFields(payload.loraStack || payload.loraName)
      }
    })

    await markStudioLive(item.ownerKey, item.id, live.id)
    void runEdit(live, {
      image,
      reference,
      prompt: payload.prompt,
      passes,
      negative: payload.negative || '',
      steps: payload.steps,
      seed: live.library?.seed || payload.seed,
      cfg: payload.cfg,
      scaleToTotalPixels: payload.scaleToTotalPixels === true,
      scaleMegapixels: payload.scaleMegapixels,
      ...persistLoraFields(payload.loraStack || payload.loraName)
    }).catch((error) => {
      const message = error instanceof Error ? error.message : String(error)
      if (live && live.status !== 'error' && live.status !== 'cancelled' && live.status !== 'deferred') {
        live.status = 'error'
        live.error = message
      }
    })
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error)
    if (live && (live.status === 'queued' || live.status === 'uploading' || live.status === 'running')) {
      live.status = 'error'
      live.error = message
    }
    await patchStudioJob(item.ownerKey, item.id, (job) => {
      job.status = 'error'
      job.lastError = message
    }).catch(() => null)
    kickStudioQueue()
  }
}

export async function startStudioJob(item: StudioJob) {
  if (studioJobKind(item) === 'edit') {
    await startStudioEditJob(item)
    return
  }
  let live: Job | undefined
  try {
  const { createJob } = await import('~/server/utils/jobs')
  const { runGeneration, frameLength } = await import('~/server/utils/videoChain')
  const { createShotQueue, setQueueJob } = await import('~/server/utils/shotQueue')
  const { stillPath } = await import('~/server/utils/library')
  const { existsSync, readFileSync } = await import('node:fs')

  const payload = item.payload
  const workflow = parseVideoWorkflow(payload.workflow)
  if (isLtxWorkflow(workflow) && !ltxWorkflowEnabled()) {
    throw new Error(LTX_DISABLED_MESSAGE)
  }
  const identity = allowIdentityRefs(
    payload.useIdentityRefs,
    payload.permanenceRefs,
    payload.globalLocks,
    payload.shotPermanenceRefs
  )
  const stillFile = payload.stillId && existsSync(stillPath(item.ownerKey, payload.stillId))
    ? {
      filename: payload.stillFilename || 'still.png',
      data: readFileSync(stillPath(item.ownerKey, payload.stillId)),
      type: 'image/png'
    }
    : null
  if (!isTextToVideo(workflow) && !stillFile) {
    throw new Error('The input still is missing from the library')
  }
  const job = createJob()
  live = job
  job.kind = 'video'
  job.maxStep = payload.steps
  job.hideThumbnail = payload.hideThumbnail
  const extensions = payload.extensions || []
  job.library = {
    ownerKey: item.ownerKey,
    folderId: payload.folderId,
    hideThumbnail: payload.hideThumbnail,
    hideInput: payload.hideInput,
    folderLocked: payload.folderLocked,
    name: payload.name,
    prompt: payload.prompt,
    aspect: payload.aspect,
    width: payload.width,
    height: payload.height,
    steps: payload.steps,
    turbo: payload.turbo,
    seed: payload.seed || Math.floor(Math.random() * 2_147_483_647),
    cfg: payload.cfg,
    fps: payload.fps,
    samplerName: payload.samplerName,
    scheduler: payload.scheduler,
    stillId: payload.stillId,
    stillFilename: payload.stillFilename,
    referenceStillIds: payload.referenceStillIds,
    duration: payload.duration,
    sound: payload.sound,
    extensions,
    chainIndex: 0,
    chainStep: 1,
    chainTotal: 1 + extensions.length,
    chainLabel: extensions.length ? 'Initial' : undefined,
    familyId: item.familyId,
    workflow: workflow,
    useIdentityRefs: identity,
    queueAutoRun: extensions.length ? payload.queueAutoRun : false,
    queueBudget: extensions.length && payload.queueAutoRun ? extensions.length : 0,
    globalLocks: payload.globalLocks,
    permanenceRefs: payload.permanenceRefs,
    shotPermanenceRefs: payload.shotPermanenceRefs,
    ...persistLoraFields(resolveLoraStack(payload.loraStack || payload.loraName, payload.shotLoraStacks?.[0] || payload.shotLoras?.[0])),
    shotLoras: payload.shotLoras,
    shotLoraStacks: payload.shotLoraStacks
  }

  if (extensions.length) {
    const queue = await createShotQueue({
      ownerKey: item.ownerKey,
      name: payload.name,
      familyId: item.familyId,
      folderId: payload.folderId,
      autoRun: payload.queueAutoRun,
      stillId: payload.stillId,
      stillFilename: payload.stillFilename,
      hideThumbnail: payload.hideThumbnail,
      hideInput: payload.hideInput,
      aspect: payload.aspect,
      width: payload.width,
      height: payload.height,
      steps: payload.steps,
      turbo: payload.turbo,
      cfg: payload.cfg,
      fps: payload.fps,
      samplerName: payload.samplerName,
      scheduler: payload.scheduler,
      workflow: workflow,
      sound: payload.sound,
      useIdentityRefs: identity,
      referenceStillIds: payload.referenceStillIds,
      globalLocks: payload.globalLocks,
      permanenceRefs: payload.permanenceRefs,
      ...persistLoraFields(payload.loraStack || payload.loraName),
      initial: { prompt: payload.prompt, duration: payload.duration, permanenceRefs: payload.shotPermanenceRefs?.[0], ...persistLoraFields(resolveLoraStack(payload.loraStack || payload.loraName, payload.shotLoraStacks?.[0] || payload.shotLoras?.[0])) },
      extensions: extensions.map((item, index) => ({
        ...item,
        ...persistLoraFields(item.loraStack || item.loraName || payload.shotLoraStacks?.[index + 1] || payload.shotLoras?.[index + 1])
      })),
      jobId: job.id
    })
    job.library.queueId = queue.id
    setQueueJob(queue.id, job.id)
    await patchStudioJob(item.ownerKey, item.id, (row) => {
      row.shotQueueId = queue.id
    })
  }

  await markStudioLive(item.ownerKey, item.id, job.id, job.library.queueId)

  const referenceImages: Array<{ filename: string; data: Buffer; type?: string } | null> = [null, null, null, null]
  for (const [index, stillId] of (payload.referenceStillIds || []).entries()) {
    if (!stillId || index >= 4) continue
    const path = stillPath(item.ownerKey, stillId)
    if (!existsSync(path)) continue
    referenceImages[index] = {
      filename: `identity-ref-${index + 2}.png`,
      data: readFileSync(path),
      type: 'image/png'
    }
  }

  void runGeneration(job, {
    prompt: payload.prompt,
    image: stillFile,
    width: payload.width,
    height: payload.height,
    steps: payload.steps,
    seed: job.library.seed,
    turbo: payload.turbo,
    length: frameLength(payload.duration, payload.fps),
    sound: payload.sound,
    cfg: payload.cfg,
    fps: payload.fps,
    samplerName: payload.samplerName,
    scheduler: payload.scheduler,
    extensions,
    workflow: workflow,
    duration: payload.duration,
    useIdentityRefs: identity,
    referenceImages,
    ...persistLoraFields(resolveLoraStack(payload.loraStack || payload.loraName, payload.shotLoraStacks?.[0] || payload.shotLoras?.[0])),
    shotLoras: payload.shotLoras,
    shotLoraStacks: payload.shotLoraStacks
  }).catch((error) => {
    const message = error instanceof Error ? error.message : String(error)
    if (job.status !== 'error' && job.status !== 'cancelled' && job.status !== 'deferred') {
      job.status = 'error'
      job.error = message
    }
  })
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error)
    if (live && (live.status === 'queued' || live.status === 'uploading' || live.status === 'running')) {
      live.status = 'error'
      live.error = message
    }
    await patchStudioJob(item.ownerKey, item.id, (job) => {
      job.status = 'error'
      job.lastError = message
    }).catch(() => null)
    kickStudioQueue()
  }
}

export async function onLiveVideoSettled(job: Job) {
  const owner = job.library?.ownerKey
  if (!owner) {
    kickStudioQueue()
    return
  }
  const remaining = job.library
    ? Math.max(0, (job.library.chainTotal || 1) - (job.library.chainStep || 1))
    : 0
  const failed = job.status === 'error' || job.status === 'cancelled'
  const snapshot = readStore(owner)
  const rowNow = snapshot.jobs.find(item => item.liveJobId === job.id)
    || (job.library?.queueId
      ? snapshot.jobs.find(item => (
        item.status === 'running'
        && item.shotQueueId === job.library?.queueId
      ))
      : undefined)
  const userPause = !failed && rowNow?.holdForCutIn !== true && (
    rowNow?.pauseAfterCurrent === true
    || rowNow?.pausedByUser === true
    || job.library?.stopAfterCurrent === true
  )
  const cutInHold = !failed && remaining > 0 && rowNow?.holdForCutIn === true && !userPause
  const interrupted = remaining > 0 && (userPause || cutInHold)
  if (interrupted && job.status === 'running') {
    job.status = 'complete'
  }
  if (userPause && remaining > 0) {
    await mutateStore(owner, (store) => {
      const row = store.jobs.find(item => item.liveJobId === job.id)
      if (!row) {
        syncPausedFlag(store)
        return
      }
      row.status = 'held'
      row.liveJobId = undefined
      row.pauseAfterCurrent = false
      row.pausedByUser = true
      row.holdForCutIn = false
      row.resumeAutoRun = row.payload.queueAutoRun === true || row.resumeAutoRun === true
      row.updatedAt = Date.now()
      syncPausedFlag(store)
    })
  } else if (cutInHold) {
    await mutate(owner, (jobs) => {
      const row = jobs.find(item => item.liveJobId === job.id)
      if (!row) return
      row.status = 'held'
      row.liveJobId = undefined
      row.holdForCutIn = true
      row.resumeAutoRun = row.payload.queueAutoRun === true || job.library?.queueAutoRun === true || row.resumeAutoRun === true
      row.updatedAt = Date.now()
    })
  } else if (userPause) {
    await mutateStore(owner, (store) => {
      const row = store.jobs.find(item => item.liveJobId === job.id)
      if (!row) {
        syncPausedFlag(store)
        return
      }
      row.status = job.status === 'cancelled'
        ? 'cancelled'
        : job.status === 'complete'
          ? 'complete'
          : 'error'
      row.liveJobId = undefined
      row.cutIn = false
      row.holdForCutIn = false
      row.pauseAfterCurrent = false
      row.pausedByUser = false
      row.lastError = job.error
      row.updatedAt = Date.now()
      syncPausedFlag(store)
    })
  } else {
    const status = job.status === 'cancelled'
      ? 'cancelled'
      : job.status === 'complete'
        ? 'complete'
        : 'error'
    await markStudioSettled(owner, job.id, status, job.error)
  }
  await kickStudioQueue()
}

function applyLiveJobPause(live: Job | undefined, pause: boolean, restoreAutoRun?: boolean) {
  if (!live?.library) return
  live.library.stopAfterCurrent = pause
  if (pause) live.library.queueAutoRun = false
  else if (restoreAutoRun) live.library.queueAutoRun = true
  patchPendingJob(live.id, {
    stopAfterCurrent: pause,
    queueAutoRun: live.library.queueAutoRun
  })
}

export async function toggleStudioQueuePause(owner: string, options: {
  resume?: boolean
  jobId?: string
  queueId?: string
} = {}) {
  const { pauseShotQueue, setShotQueuePause, listShotQueues, getShotQueue } = await import('~/server/utils/shotQueue')
  const storeNow = readStore(owner)
  const running = storeNow.jobs.find(job => job.status === 'running')
  const target = options.jobId
    ? storeNow.jobs.find(job => job.id === options.jobId)
    : options.queueId
      ? storeNow.jobs.find(job => job.shotQueueId === options.queueId)
      : running || storeNow.jobs.find(job => job.pauseAfterCurrent || job.pausedByUser)
  const queueArmed = options.queueId
    ? listShotQueues(owner).some(queue => queue.id === options.queueId && queue.stopAfterCurrent === true)
    : target?.shotQueueId
      ? listShotQueues(owner).some(queue => queue.id === target.shotQueueId && queue.stopAfterCurrent === true)
      : false
  const armed = target?.pauseAfterCurrent === true
    || target?.pausedByUser === true
    || queueArmed
  const shouldPause = options.resume === true ? false : options.resume === false ? true : !armed

  if (!shouldPause) {
    const heldPaused = storeNow.jobs.filter(job => (
      job.status === 'held'
      && Boolean(job.shotQueueId)
      && job.pausedByUser === true
      && (!options.jobId || job.id === options.jobId)
      && (!options.queueId || job.shotQueueId === options.queueId)
    ))
    const restored = await mutateStore(owner, (store) => {
      for (const job of store.jobs) {
        if (options.jobId && job.id !== options.jobId) continue
        if (options.queueId && job.shotQueueId !== options.queueId) continue
        job.pauseAfterCurrent = false
        job.pausedByUser = false
      }
      syncPausedFlag(store)
      return structuredClone(store)
    })
    const rows = options.jobId
      ? restored.jobs.filter(job => job.id === options.jobId)
      : options.queueId
        ? restored.jobs.filter(job => job.shotQueueId === options.queueId)
        : restored.jobs
    for (const row of rows) {
      if (row.liveJobId) applyLiveJobPause(getJob(row.liveJobId), false, row.payload.queueAutoRun === true || row.resumeAutoRun === true)
      if (row.shotQueueId) await setShotQueuePause(owner, row.shotQueueId, false).catch(() => null)
    }
    if (!options.jobId && !options.queueId) {
      for (const queue of listShotQueues(owner)) {
        if (queue.stopAfterCurrent) await setShotQueuePause(owner, queue.id, false).catch(() => null)
      }
    } else if (options.queueId) {
      const rowHasQueue = rows.some(job => job.shotQueueId === options.queueId)
      if (!rowHasQueue) await setShotQueuePause(owner, options.queueId, false).catch(() => null)
    }
    const busy = await videoJobsBusy()
    if (heldPaused[0] && !busy) {
      await resumeHeldStudioJob(heldPaused[0]).catch(() => null)
    } else {
      if (heldPaused.length && busy) {
        await mutate(owner, (jobs) => {
          for (const job of jobs) {
            if (!heldPaused.some(item => item.id === job.id)) continue
            job.holdForCutIn = true
            job.pausedByUser = false
            job.pauseAfterCurrent = false
            job.updatedAt = Date.now()
          }
        }).catch(() => null)
      }
      kickStudioQueue()
    }
    return { paused: false, willPause: false }
  }

  const updated = await mutateStore(owner, (store) => {
    const row = options.jobId
      ? store.jobs.find(job => job.id === options.jobId)
      : options.queueId
        ? store.jobs.find(job => job.shotQueueId === options.queueId)
        : store.jobs.find(job => job.status === 'running')
    if (row) {
      if (row.status !== 'running' && row.status !== 'held') {
        throw createError({ statusCode: 409, statusMessage: 'Nothing is generating on that job' })
      }
      if (row.status === 'running') {
        row.pauseAfterCurrent = true
      } else {
        row.pausedByUser = true
        row.pauseAfterCurrent = false
        row.holdForCutIn = false
      }
      row.resumeAutoRun = row.payload.queueAutoRun === true || row.resumeAutoRun === true
      row.updatedAt = Date.now()
    }
    syncPausedFlag(store)
    return {
      paused: store.paused,
      job: row ? structuredClone(row) : null
    }
  })

  const queueId = updated.job?.shotQueueId || options.queueId
  if (updated.job?.liveJobId) {
    applyLiveJobPause(getJob(updated.job.liveJobId), true)
    patchPendingJob(updated.job.liveJobId, { stopAfterCurrent: true, queueAutoRun: false })
  }
  for (const pending of listPendingJobs()) {
    if (pending.ownerKey !== owner) continue
    if (queueId) {
      if (pending.queueId !== queueId) continue
    } else if (updated.job?.liveJobId) {
      if (pending.jobId !== updated.job.liveJobId) continue
    } else {
      continue
    }
    patchPendingJob(pending.jobId, { stopAfterCurrent: true, queueAutoRun: false })
  }
  const queued = queueId ? getShotQueue(owner, queueId) : null
  if (updated.job && queued?.autoRun) {
    await patchStudioJob(owner, updated.job.id, (job) => {
      job.resumeAutoRun = true
    }).catch(() => null)
  }
  if (queueId) await pauseShotQueue(owner, queueId).catch(() => null)
  if (!updated.job && !queueId) {
    for (const queue of listShotQueues(owner)) {
      if (queue.status === 'running') await pauseShotQueue(owner, queue.id).catch(() => null)
    }
  }
  const anyGenerating = storeNow.jobs.some(job => job.status === 'running')
    || listShotQueues(owner).some(queue => queue.status === 'running')
  if (!updated.job && !queueId && !anyGenerating) {
    throw createError({ statusCode: 409, statusMessage: 'Nothing is generating, so there is nothing to pause after' })
  }
  return {
    paused: true,
    willPause: updated.job?.status === 'running' || Boolean(queued?.status === 'running') || anyGenerating,
    jobId: updated.job?.id,
    queueId
  }
}

export async function onStudioQueueBurstStarted(owner: string, queueId: string, liveJobId: string) {
  await mutateStore(owner, (store) => {
    const row = store.jobs.find(job => job.shotQueueId === queueId)
    if (!row) {
      syncPausedFlag(store)
      return
    }
    row.status = 'running'
    row.liveJobId = liveJobId
    row.pauseAfterCurrent = false
    row.pausedByUser = false
    row.holdForCutIn = false
    row.updatedAt = Date.now()
    syncPausedFlag(store)
  })
}