import { existsSync, mkdirSync, readdirSync, readFileSync, renameSync, rmSync, writeFileSync } from 'node:fs'
import { join } from 'node:path'

export interface PendingJob {
  jobId: string
  promptId: string
  clientId: string
  ownerKey: string
  folderId: string
  hideThumbnail: boolean
  prompt: string
  aspect: string
  width: number
  height: number
  steps: number
  turbo: boolean
  seed: number
  startedAt: number
}

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

function pendingPath(jobId: string) {
  return join(pendingRoot(), `${jobId}.json`)
}

function ensurePending() {
  mkdirSync(pendingRoot(), { recursive: true })
}

export function writePendingJob(job: PendingJob) {
  ensurePending()
  const tmp = pendingPath(job.jobId) + '.tmp'
  writeFileSync(tmp, JSON.stringify(job, null, 2))
  renameSync(tmp, pendingPath(job.jobId))
}

export function readPendingJob(jobId: string): PendingJob | null {
  const path = pendingPath(jobId)
  if (!existsSync(path)) return null
  try {
    return JSON.parse(readFileSync(path, 'utf8')) as PendingJob
  } catch {
    return null
  }
}

export function listPendingJobs(): PendingJob[] {
  ensurePending()
  return readdirSync(pendingRoot())
    .filter(name => name.endsWith('.json'))
    .map(name => readPendingJob(name.replace(/\.json$/, '')))
    .filter((job): job is PendingJob => Boolean(job))
}

export function deletePendingJob(jobId: string) {
  rmSync(pendingPath(jobId), { force: true })
}

export async function completePendingIfReady(pending: PendingJob) {
  const history = await fetchHistory(pending.promptId)
  const video = extractVideo(history, pending.promptId)
  if (!video) return null
  const buffer = await downloadComfyVideo(video)
  const clip = await saveClip({
    ownerKey: pending.ownerKey,
    folderId: pending.folderId,
    prompt: pending.prompt,
    aspect: pending.aspect,
    width: pending.width,
    height: pending.height,
    steps: pending.steps,
    turbo: pending.turbo,
    seed: pending.seed,
    hideThumbnail: pending.hideThumbnail,
    video: buffer,
    thumb: null,
    comfyFilename: video.filename
  })
  deletePendingJob(pending.jobId)
  return {
    type: 'complete' as const,
    status: 'complete' as const,
    message: 'Video ready',
    progress: 100,
    clipId: clip.id,
    filename: video.filename,
    subfolder: video.subfolder,
    mediaType: video.type,
    hideThumbnail: pending.hideThumbnail
  }
}