import { getProfilePosts } from './threads-profile-scraper'

const SUCCESS_CODE = 102000
const API_BASE = process.env.HAIXUN_BACKEND_URL ?? 'http://127.0.0.1:8890'
const WORKER_ID =
  process.env.HAIXUN_NODE_WORKER_ID ??
  `${process.env.HOSTNAME ?? 'local'}-style-8d-node-${process.pid}`
const WORKER_SECRET = process.env.HAIXUN_WORKER_SECRET ?? ''
const POLL_INTERVAL_MS = Number(process.env.HAIXUN_WORKER_POLL_MS ?? 3000)
const TARGET_SAMPLES = Number(process.env.HAIXUN_8D_TARGET_SAMPLES ?? 4)

type ApiEnvelope<T> = {
  code: number
  message: string
  data?: T
}

type StepStatus = 'pending' | 'running' | 'succeeded' | 'failed' | 'cancelled'

type JobStep = {
  id: string
  status: StepStatus
  started_at?: number
  ended_at?: number
  message?: string
}

type JobData = {
  id: string
  template_type: string
  scope_id: string
  status: string
  phase: string
  payload: Record<string, unknown>
  progress: {
    summary: string
    percentage: number
    steps: JobStep[]
  }
}

type ScrapedPost = {
  text: string
  permalink?: string
  likeCount?: number
  replyCount?: number
}

type BrowserSessionData = {
  account_id: string
  storage_state: string
  update_at: number
}

const STYLE_STEPS = ['session', 'samples', 'style', 'store']

const STEP_PROGRESS: Record<string, number> = {
  session: 10,
  samples: 40,
  style: 75,
  store: 92,
}

function sleep(ms: number) {
  return new Promise((resolve) => setTimeout(resolve, ms))
}

function nowNano() {
  return Date.now() * 1_000_000
}

async function api<T>(path: string, body?: unknown, method = 'POST'): Promise<T | undefined> {
  const headers: Record<string, string> = { 'Content-Type': 'application/json' }
  if (WORKER_SECRET) headers['X-Worker-Secret'] = WORKER_SECRET

  const res = await fetch(`${API_BASE}${path}`, {
    method,
    headers,
    body: body === undefined ? undefined : JSON.stringify(body),
  })
  const raw = await res.text()
  let json: ApiEnvelope<T>
  try {
    json = JSON.parse(raw) as ApiEnvelope<T>
  } catch {
    throw new Error(`worker API returned non-JSON response from ${path}: HTTP ${res.status}`)
  }
  if (json.code !== SUCCESS_CODE) {
    throw new Error(json.message || `request failed: ${path}`)
  }
  return json.data
}

async function claimJob() {
  return api<JobData | null>('/api/v1/internal/workers/jobs/claim', {
    worker_type: 'node',
    worker_id: WORKER_ID,
  })
}

async function heartbeat(jobID: string) {
  await api(`/api/v1/internal/workers/jobs/${encodeURIComponent(jobID)}/heartbeat`, {
    worker_id: WORKER_ID,
    ttl_seconds: 300,
  })
}

async function isCancelRequested(jobID: string) {
  const data = await api<{ cancelled: boolean }>(
    `/api/v1/internal/workers/jobs/${encodeURIComponent(jobID)}/cancel-check`,
    { worker_id: WORKER_ID },
  )
  return !!data?.cancelled
}

async function ackCancel(jobID: string) {
  await api(`/api/v1/internal/workers/jobs/${encodeURIComponent(jobID)}/cancel-ack`, {
    worker_id: WORKER_ID,
  })
}

async function failJob(jobID: string, error: unknown, phase?: string) {
  const message = error instanceof Error ? error.message : String(error)
  await api(`/api/v1/internal/workers/jobs/${encodeURIComponent(jobID)}/fail`, {
    worker_id: WORKER_ID,
    error: message,
    phase,
  })
}

async function completeJob(jobID: string, result: Record<string, unknown>) {
  await api(`/api/v1/internal/workers/jobs/${encodeURIComponent(jobID)}/complete`, {
    worker_id: WORKER_ID,
    result,
  })
}

async function report(job: JobData, phase: string, summary: string, steps: JobStep[], percentage?: number) {
  await api(`/api/v1/internal/workers/jobs/${encodeURIComponent(job.id)}/progress`, {
    worker_id: WORKER_ID,
    phase,
    summary,
    percentage: percentage ?? STEP_PROGRESS[phase] ?? job.progress?.percentage ?? 0,
    steps,
  })
}

function normalizeSteps(job: JobData): JobStep[] {
  const existing = new Map((job.progress?.steps ?? []).map((step) => [step.id, step]))
  return STYLE_STEPS.map((id) => existing.get(id) ?? { id, status: 'pending' as const })
}

function updateStep(steps: JobStep[], id: string, status: StepStatus, message: string): JobStep[] {
  const at = nowNano()
  return steps.map((step) => {
    if (step.id !== id) return step
    return {
      ...step,
      status,
      message,
      started_at: step.started_at ?? at,
      ended_at: status === 'succeeded' || status === 'failed' || status === 'cancelled' ? at : step.ended_at,
    }
  })
}

async function runStep<T>(
  job: JobData,
  steps: JobStep[],
  phase: string,
  runningMessage: string,
  doneMessage: string,
  fn: () => Promise<T>,
) {
  let nextSteps = updateStep(steps, phase, 'running', runningMessage)
  await report(job, phase, runningMessage, nextSteps)
  if (await isCancelRequested(job.id)) {
    nextSteps = updateStep(nextSteps, phase, 'cancelled', '使用者已取消')
    await report(job, phase, '任務已收到取消請求', nextSteps)
    await ackCancel(job.id)
    throw new Error('cancelled')
  }

  let result: T
  try {
    result = await fn()
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error)
    nextSteps = updateStep(nextSteps, phase, 'failed', message)
    await report(job, phase, message, nextSteps)
    throw error
  }
  nextSteps = updateStep(nextSteps, phase, 'succeeded', doneMessage)
  await report(job, phase, doneMessage, nextSteps)
  return { result, steps: nextSteps }
}

async function getBrowserStorageState(job: JobData) {
  const accountID = String(job.payload.threads_account_id ?? '').trim()
  const tenantID = String(job.payload.tenant_id ?? '').trim()
  const ownerUID = String(job.payload.owner_uid ?? '').trim()
  if (!accountID || !tenantID || !ownerUID) return ''
  try {
    const data = await api<BrowserSessionData>(
      `/api/v1/internal/workers/threads-accounts/${encodeURIComponent(accountID)}/session`,
      {
        tenant_id: tenantID,
        owner_uid: ownerUID,
      },
    )
    return data?.storage_state ?? ''
  } catch (error) {
    console.warn(`[8d-worker] browser session unavailable, fallback to public page: ${error}`)
    return ''
  }
}

function toProgressSteps(steps: JobStep[]) {
  return steps.map((step) => ({
    id: step.id,
    status: step.status,
    started_at: step.started_at,
    ended_at: step.ended_at,
    message: step.message,
  }))
}

async function analyzeStyle8DWithGo(job: JobData, username: string, posts: ScrapedPost[], steps: JobStep[]) {
  const personaID = String(job.payload.persona_id ?? job.scope_id ?? '').trim()
  const tenantID = String(job.payload.tenant_id ?? '').trim()
  const ownerUID = String(job.payload.owner_uid ?? '').trim()
  const accountID = String(job.payload.threads_account_id ?? '').trim()
  if (!personaID || !tenantID || !ownerUID || !accountID) {
    throw new Error('job payload 缺少 persona_id / tenant_id / owner_uid / threads_account_id')
  }

  const data = await api<{
    persona_id: string
    post_count: number
    style_profile: string
    style_benchmark: string
  }>(
    `/api/v1/internal/workers/jobs/${encodeURIComponent(job.id)}/analyze-style-8d`,
    {
      worker_id: WORKER_ID,
      tenant_id: tenantID,
      owner_uid: ownerUID,
      persona_id: personaID,
      threads_account_id: accountID,
      username,
      posts: posts.map((post) => ({
        text: post.text,
        permalink: post.permalink,
        like_count: post.likeCount ?? 0,
        reply_count: post.replyCount ?? 0,
      })),
      steps: toProgressSteps(steps),
    },
  )
  if (!data?.style_profile?.trim()) {
    throw new Error('Go 8D 分析未回傳 style_profile')
  }
  return data
}

async function processStyle8D(job: JobData) {
  const username = String(job.payload.benchmark_username ?? '').replace(/^@/, '').trim()
  if (!username) throw new Error('job payload 缺少 benchmark_username')

  let steps = normalizeSteps(job)
  const hb = setInterval(() => {
    heartbeat(job.id).catch((error) => console.warn(`[8d-worker] heartbeat failed: ${error}`))
  }, 30_000)

  try {
    let storageState = ''
    ;({ result: storageState, steps } = await runStep(
      job,
      steps,
      'session',
      '確認 Chrome extension session 是否已同步…',
      'Chrome session 已就緒',
      async () => {
        await heartbeat(job.id)
        const state = await getBrowserStorageState(job)
        if (!state.trim()) {
          const accountID = String(job.payload.threads_account_id ?? '').trim()
          if (!accountID) {
            throw new Error(
              '尚未選定經營帳號。請在頂部切換 Threads 帳號，到連線頁用擴充套件同步登入態後再跑 8D。',
            )
          }
          throw new Error(
            'Chrome session 尚未同步到此帳號。請到該帳號連線頁，確認 Threads 已在 Chrome 登入，再按擴充套件同步。',
          )
        }
        return state
      },
    ))

    let posts: ScrapedPost[] = []
    ;({ result: posts, steps } = await runStep(
      job,
      steps,
      'samples',
      `使用登入態抓取 @${username} 近期貼文樣本…`,
      '貼文樣本已抓取',
      async () => getProfilePosts(storageState, username, 12),
    ))

    if (posts.length < TARGET_SAMPLES) {
      throw new Error(
        `可讀取的近期貼文不足 ${TARGET_SAMPLES} 篇（目前 ${posts.length} 篇）。請確認對標帳號存在、有公開貼文，且 Chrome session 仍有效（可重新同步擴充套件）。`,
      )
    }

    steps = updateStep(steps, 'style', 'running', `已取得 ${posts.length} 篇，交由 Go LLM 分析八個維度…`)
    await report(job, 'style', `已取得 ${posts.length} 篇，交由 Go LLM 分析八個維度…`, steps, 55)
    if (await isCancelRequested(job.id)) {
      steps = updateStep(steps, 'style', 'cancelled', '使用者已取消')
      await report(job, 'style', '任務已收到取消請求', steps)
      await ackCancel(job.id)
      throw new Error('cancelled')
    }

    const analyzed = await analyzeStyle8DWithGo(job, username, posts, steps)
    steps = updateStep(updateStep(steps, 'style', 'succeeded', '8D 風格策略已產生'), 'store', 'succeeded', '8D 策略已寫入人設')
    await report(job, 'store', '8D 策略已寫入人設', steps, 92)

    await completeJob(job.id, {
      persona_id: job.payload.persona_id,
      benchmark_username: username,
      post_count: analyzed.post_count,
      message: '8D style profile analyzed by Go LLM and stored',
    })
    console.log(`[8d-worker] completed job=${job.id} username=${username} posts=${posts.length}`)
  } finally {
    clearInterval(hb)
  }
}

async function main() {
  console.log(`[8d-worker] started id=${WORKER_ID} api=${API_BASE}`)
  while (true) {
    try {
      const job = await claimJob()
      if (!job) {
        await sleep(POLL_INTERVAL_MS)
        continue
      }
      console.log(`[8d-worker] claimed job=${job.id} template=${job.template_type}`)
      if (job.template_type !== 'style-8d') {
        await failJob(job.id, new Error(`unsupported node job template: ${job.template_type}`))
        continue
      }
      try {
        await processStyle8D(job)
      } catch (error) {
        if (error instanceof Error && error.message === 'cancelled') {
          console.log(`[8d-worker] cancelled job=${job.id}`)
        } else {
          console.error(`[8d-worker] failed job=${job.id}`, error)
          await failJob(job.id, error, job.phase)
        }
      }
    } catch (error) {
      console.error('[8d-worker] loop error', error)
      await sleep(POLL_INTERVAL_MS)
    }
  }
}

main().catch((error) => {
  console.error('[8d-worker] fatal', error)
  process.exit(1)
})