import { computed, onMounted, onUnmounted, ref } from 'vue'
import { useFullscreen } from '@vueuse/core'
import type { Product } from '@/models/products'
import { getTvProducts, getTvServerTime } from '@/api/products'
import { getConfigApp } from '@/utils/config'
import { useSettingsStore } from '@/store/settingsStore'
import { getTvProductBuyPrice, getTvProductSellPrice, isTvProductPriceInactive } from '@/utils/productPrice'
import { getLastPrices, getTradeBuyPrice, getTradeSellPrice, lastPrice, startLastPricePolling, stopLastPricePolling } from '@/utils/price'
import { usePriceWithoutType } from '@/utils/usePrice'
import { getPriceDisplayMessage, getPriceDisplayState, NO_QUOTE_MESSAGE } from '@/utils/storeHours'
import { isMeltedTradeGroup, isMetalCommodityGroup } from '@/utils/productCategories'
import { priceSocketConnected, priceStreamLifecycle } from '@/utils/priceSocketState'
import logoFallback from '@/assets/img/logo_full_.png'
//@ts-ignore
import moment from 'moment-jalaali'
//@ts-ignore
import fa from 'moment/src/locale/fa'

moment.locale('fa', fa)
moment.loadPersian({ usePersianDigits: false })

const CURSOR_HIDE_MS = 2500
const TV_HTML_CLASS = 'app-layout--tv'
const REFRESH_MS = 15000
/** دقت تابلو: هزار تومان = ۱۰٬۰۰۰ ریال — باقی‌مانده به پایین حذف می‌شود */
const TV_TOMAN_STEP = 1000

function parseTvNews(raw: unknown): string[] {
  const text = String(raw ?? '').trim()
  if (!text) return []

  try {
    const decoded = JSON.parse(text)
    if (Array.isArray(decoded)) {
      return decoded.map((item) => String(item ?? '').trim()).filter(Boolean)
    }
  } catch {
    // هر خط یک خبر
  }

  return text
    .split(/\r?\n/)
    .map((line) => line.replace(/^[-•*]\s+/, '').trim())
    .filter(Boolean)
}

function floorTvToman(rial: number): number {
  if (!Number.isFinite(rial) || rial <= 0) return 0
  return Math.floor(rial / 10 / TV_TOMAN_STEP) * TV_TOMAN_STEP
}

function formatTvPrice(rial: number): string {
  const toman = floorTvToman(rial)
  return toman > 0 ? usePriceWithoutType(toman) : '—'
}

function productText(product: Product) {
  return `${product.group_type ?? ''} ${product.title ?? ''}`
}

function isShowOnTv(product: Product) {
  const value = product.show_on_tv as unknown
  return value === true || value === 1 || value === '1' || value === 'true'
}

function isParsianCoin(product: Product) {
  return productText(product).includes('پارسیان')
}

function isBankCoin(product: Product) {
  if (isParsianCoin(product)) return false
  const group = (product.group_type ?? '').trim()
  const title = (product.title ?? '').trim()
  if (group === 'سکه' || group === 'سکه بانکی') return true
  if (group.includes('سکه') && !group.includes('پارسیان')) return true
  if (title.includes('بانکی')) return true
  // API سبک TV ممکن است group_type نداشته باشد
  if (title.includes('سکه') && !title.includes('پارسیان')) return true
  return false
}

function bankCoinRank(product: Product) {
  const text = productText(product)
  if (text.includes('نیم')) return 2
  if (text.includes('ربع')) return 3
  if (text.includes('تمام') || text.includes('امامی') || text.includes('بهار')) return 1
  return 99
}

function isSimorghBar(product: Product) {
  return productText(product).includes('سیمرغ')
}

function isGoldBar(product: Product) {
  if (isMeltedTradeGroup(product.group_type) || isMetalCommodityGroup(product.group_type)) {
    return false
  }

  const group = (product.group_type ?? '').trim()
  if (group.includes('شمش') || isSimorghBar(product)) {
    return true
  }

  return (product.title ?? '').includes('شمش')
}

export function useTvMonitorPage() {
  const settingsStore = useSettingsStore()
  const rootEl = ref<HTMLElement | null>(null)
  const { isFullscreen, enter: enterFullscreen, exit: exitFullscreen } = useFullscreen(rootEl)

  const products = ref<Product[]>([])
  const loading = ref(true)
  const nowLabel = ref('')
  const dateLabel = ref('')
  const cursorHidden = ref(false)
  const wakeLockSentinel = ref<{ release: () => Promise<void> } | null>(null)

  let clockTimer: ReturnType<typeof setInterval> | undefined
  let cursorTimer: ReturnType<typeof setTimeout> | undefined
  let listTimer: ReturnType<typeof setInterval> | undefined
  /** اختلاف میلی‌ثانیهٔ ساعت سرور (Asia/Tehran) با Date.now محلی */
  let serverOffsetMs = 0

  const brandName = computed(
    () => String(getConfigApp('name_fa') || getConfigApp('name') || 'تابلو قیمت'),
  )
  const brandLogo = computed(() => String(getConfigApp('avatar') || logoFallback))

  // API فقط show_on_tv می‌دهد؛ فیلتر کلاینت برای دادهٔ ناقص است
  const catalogProducts = computed(() => {
    const list = products.value
    if (!list.length) return list
    const marked = list.filter(isShowOnTv)
    return marked.length ? marked : list
  })

  function normalizeTvProduct(raw: Product): Product {
    const image = (raw as Product & { image?: string | null }).image
    if (image && !raw.img) {
      return { ...raw, img: image }
    }
    return raw
  }

  async function syncServerClock() {
    const t0 = Date.now()
    const payload = await getTvServerTime()
    const t1 = Date.now()
    if (!payload?.unix) return
    const rttHalf = (t1 - t0) / 2
    serverOffsetMs = payload.unix * 1000 + rttHalf - t1
  }

  const parsianCoins = computed(() =>
    catalogProducts.value
      .filter(isParsianCoin)
      .sort((a, b) => Number(a.amount ?? 0) - Number(b.amount ?? 0)),
  )

  const bankCoins = computed(() =>
    catalogProducts.value
      .filter(isBankCoin)
      .sort((a, b) => bankCoinRank(a) - bankCoinRank(b) || Number(a.amount ?? 0) - Number(b.amount ?? 0)),
  )

  const hasCoinBoard = computed(
    () => parsianCoins.value.length > 0 || bankCoins.value.length > 0,
  )

  const coinRowCount = computed(() =>
    Math.max(parsianCoins.value.length, bankCoins.value.length, 1),
  )

  const simorghBars = computed(() =>
    catalogProducts.value
      .filter(isSimorghBar)
      .sort((a, b) => Number(a.amount ?? 0) - Number(b.amount ?? 0)),
  )

  /** تیکر بالا: فقط شمش‌های تابلو */
  const tickerProducts = computed(() =>
    catalogProducts.value
      .filter(isGoldBar)
      .sort((a, b) => Number(a.amount ?? 0) - Number(b.amount ?? 0)),
  )

  const tickerTitle = computed(() => (tickerProducts.value.length ? 'مظنه شمش‌ها' : ''))

  /** تیکر پایین: بقیه — نه سکه، نه پارسیان، نه شمش */
  const extraTickerProducts = computed(() =>
    catalogProducts.value
      .filter((product) => !isParsianCoin(product) && !isBankCoin(product) && !isGoldBar(product))
      .sort((a, b) => (a.title ?? '').localeCompare(b.title ?? '', 'fa')),
  )

  const extraTickerTitle = computed(() =>
    extraTickerProducts.value.length ? 'سایر مظنه‌ها' : '',
  )

  const tvNewsItems = computed(() => {
    void settingsStore.settingsRevision
    return parseTvNews(settingsStore.getSettingByKey('tv_news') ?? getConfigApp('tv_news'))
  })

  const newsTickerTitle = computed(() => (tvNewsItems.value.length ? 'اخبار' : ''))

  const hasBoardContent = computed(
    () =>
      hasCoinBoard.value
      || tickerProducts.value.length > 0
      || extraTickerProducts.value.length > 0
      || tvNewsItems.value.length > 0,
  )

  const statusBanner = computed(() => {
    void lastPrice.value
    const state = getPriceDisplayState()
    return state === 'open' ? '' : getPriceDisplayMessage(state)
  })

  const liveBuy = computed(() => getTradeBuyPrice(lastPrice.value))
  const liveSell = computed(() => getTradeSellPrice(lastPrice.value))

  const isLive = computed(
    () => priceSocketConnected.value || priceStreamLifecycle.value === 'open',
  )

  async function loadProducts() {
    try {
      const list = await getTvProducts()
      products.value = (Array.isArray(list) ? list : []).map(normalizeTvProduct)
    } catch {
      if (!products.value.length) {
        products.value = []
      }
    } finally {
      loading.value = false
    }
  }

  function updateClock() {
    const now = moment(Date.now() + serverOffsetMs).utcOffset(210)
    nowLabel.value = now.format('HH:mm:ss')
    dateLabel.value = now.format('dddd jD jMMMM jYYYY')
  }

  function hideCursorSoon() {
    cursorHidden.value = false
    if (cursorTimer) clearTimeout(cursorTimer)
    cursorTimer = setTimeout(() => {
      cursorHidden.value = true
    }, CURSOR_HIDE_MS)
  }

  async function requestWakeLock() {
    try {
      const nav = navigator as Navigator & {
        wakeLock?: { request: (type: 'screen') => Promise<{ release: () => Promise<void> }> }
      }
      wakeLockSentinel.value = (await nav.wakeLock?.request('screen')) ?? null
    } catch {
      wakeLockSentinel.value = null
    }
  }

  async function releaseWakeLock() {
    try {
      await wakeLockSentinel.value?.release()
    } catch {
      /* ignore */
    }
    wakeLockSentinel.value = null
  }

  async function onVisibilityChange() {
    if (document.visibilityState === 'visible') {
      await requestWakeLock()
    }
  }

  async function toggleFullscreen(event?: Event) {
    event?.stopPropagation()
    hideCursorSoon()
    try {
      if (isFullscreen.value) {
        await exitFullscreen()
      } else {
        await enterFullscreen()
      }
    } catch {
      /* browser may block without gesture */
    }
  }

  function productWeightLabel(product: Product) {
    if (isMeltedTradeGroup(product.group_type)) {
      return 'قیمت هر گرم'
    }
    const amount = Number(product.amount ?? 0)
    if (!amount) return ''
    if (amount < 1) return `${amount * 1000} سوت`
    return `${amount} گرم`
  }

  function simorghWeightLabel(product: Product) {
    const amount = Number(product.amount ?? 0)
    if (!amount) return product.title
    return `${amount} گرم`
  }

  function tickerItemLabel(product: Product) {
    const title = (product.title ?? '').trim()
    if (title) return title
    return simorghWeightLabel(product)
  }

  function isProductTvInactive(product: Product) {
    return isTvProductPriceInactive(product)
  }

  function productBuyLabel(product: Product) {
    if (isProductTvInactive(product)) return NO_QUOTE_MESSAGE
    return formatTvPrice(getTvProductBuyPrice(product))
  }

  function productSellLabel(product: Product) {
    if (isProductTvInactive(product)) return NO_QUOTE_MESSAGE
    return formatTvPrice(getTvProductSellPrice(product))
  }

  function liveQuoteLabel(value: number) {
    return formatTvPrice(value)
  }

  onMounted(async () => {
    document.documentElement.classList.add(TV_HTML_CLASS)
    await syncServerClock()
    updateClock()
    hideCursorSoon()
    clockTimer = setInterval(updateClock, 1000)
    window.addEventListener('mousemove', hideCursorSoon)
    document.addEventListener('visibilitychange', onVisibilityChange)
    await requestWakeLock()

    startLastPricePolling()
    void getLastPrices()
    void loadProducts()
    listTimer = setInterval(() => {
      void loadProducts()
      void syncServerClock()
    }, REFRESH_MS)

    document.title = `${brandName.value} | تابلو قیمت`
  })

  onUnmounted(() => {
    document.documentElement.classList.remove(TV_HTML_CLASS)
    document.title = String(getConfigApp('name_fa') || getConfigApp('name') || '')
    if (clockTimer) clearInterval(clockTimer)
    if (cursorTimer) clearTimeout(cursorTimer)
    if (listTimer) clearInterval(listTimer)
    window.removeEventListener('mousemove', hideCursorSoon)
    document.removeEventListener('visibilitychange', onVisibilityChange)
    void releaseWakeLock()
    stopLastPricePolling()
  })

  return {
    rootEl,
    brandName,
    brandLogo,
    nowLabel,
    dateLabel,
    parsianCoins,
    bankCoins,
    hasCoinBoard,
    hasBoardContent,
    coinRowCount,
    tickerProducts,
    tickerTitle,
    extraTickerProducts,
    extraTickerTitle,
    tvNewsItems,
    newsTickerTitle,
    statusBanner,
    liveBuy,
    liveSell,
    isLive,
    isFullscreen,
    cursorHidden,
    loading,
    productWeightLabel,
    tickerItemLabel,
    isProductTvInactive,
    productBuyLabel,
    productSellLabel,
    liveQuoteLabel,
    toggleFullscreen,
  }
}