import { computed, ref } from 'vue'
import { message } from 'ant-design-vue'
import { useRoute, useRouter } from 'vue-router'
import {
  buildDepositSmsUrl,
  buildSupportPhoneUrl,
  loadSupportMessengerFromSettings,
  messengerNeedsClipboardCopy,
  openSupportMessengerEntry,
  resolveDepositGuideText,
  resolveDepositSupportMessage,
  resolveSupportMessengerEntries,
  resolveSupportMessengerLink,
  resolveSupportMessengerMeta,
  supportMessengerPickerAnchor,
  supportMessengerPickerOpen,
  supportMessengerSettings,
  type ResolvedSupportMessengerEntry,
} from '@/utils/supportMessenger'
import {
  copyDepositFieldValue,
  displayDepositCardNumber,
  displayDepositSheba,
  getDepositGuideVarsFromSettings,
  getDepositSettingLabel,
  hasDepositFieldValue,
} from '@/utils/depositGuideText'
import { useSettingsStore } from '@/store/settingsStore'
import { isUserSupportChatEnabled } from '@/utils/chat'

/** plain: منوی شناور / درباره ما — بدون پیش‌متن | deposit: مودال واریز — با deposit_support_message_text */
type SupportPickerIntent = 'plain' | 'deposit'

const CHAT_PICKER_ENTRY: ResolvedSupportMessengerEntry = {
  messenger: 'chat',
  id: 'support-chat',
  label: 'چت پشتیبانی',
  icon: 'vuesax-linear:messages-2',
  accent: '#16a34a',
  url: '',
}

export function useSupportMessenger() {
  const settingsStore = useSettingsStore()
  const router = useRouter()
  const route = useRoute()
  const supportPickerOpen = supportMessengerPickerOpen
  const supportPickerIntent = ref<SupportPickerIntent>('plain')

  /** چت فقط بعد از لاگین — روی صفحه ورود در picker نیاید */
  const isChatEnabled = computed(() => {
    void route.name
    return isUserSupportChatEnabled()
  })

  const legacySupportLink = computed(() => '')

  const depositSupportMessage = computed(() => resolveDepositSupportMessage())

  const supportMessengerEntries = computed(() =>
    resolveSupportMessengerEntries(supportMessengerSettings.value),
  )

  const pickerEntries = computed(() => {
    const list = [...supportMessengerEntries.value]
    if (isChatEnabled.value) {
      list.unshift(CHAT_PICKER_ENTRY)
    }
    return list
  })

  const primaryMessengerEntry = computed(() => supportMessengerEntries.value[0] ?? null)

  const messengerType = computed(
    () => (primaryMessengerEntry.value?.messenger ?? supportMessengerSettings.value.messenger ?? '').trim().toLowerCase(),
  )

  const messengerMeta = computed(() => {
    if (isChatEnabled.value && supportMessengerEntries.value.length === 0) {
      return {
        label: CHAT_PICKER_ENTRY.label,
        icon: CHAT_PICKER_ENTRY.icon,
        accent: CHAT_PICKER_ENTRY.accent,
      }
    }
    return primaryMessengerEntry.value
      ? {
          label: primaryMessengerEntry.value.label,
          icon: primaryMessengerEntry.value.icon,
          accent: primaryMessengerEntry.value.accent,
        }
      : resolveSupportMessengerMeta(messengerType.value)
  })

  const messengerLink = computed(() =>
    primaryMessengerEntry.value?.url
      || resolveSupportMessengerLink(
        supportMessengerSettings.value.messenger,
        supportMessengerSettings.value.messengerId,
        legacySupportLink.value,
      ),
  )

  function goToSupportChat() {
    void router.push({ name: 'support' })
    return true
  }

  async function openMessengerEntry(entry: ResolvedSupportMessengerEntry, text?: string) {
    if (entry.messenger === 'chat') {
      return goToSupportChat()
    }

    const messageText =
      text !== undefined
        ? text.trim()
        : supportPickerIntent.value === 'deposit'
          ? depositSupportMessage.value.trim()
          : ''
    const opened = await openSupportMessengerEntry(entry, messageText, legacySupportLink.value)
    if (!opened) return false

    if (messageText && messengerNeedsClipboardCopy(entry.messenger)) {
      message.success('متن پیام کپی شد — در پیام‌رسان paste کنید')
    }
    return true
  }

  let supportPickerOpenedAt = 0

  async function openSupportPicker(
    intent: SupportPickerIntent,
    anchorEl?: HTMLElement | null,
  ) {
    supportPickerIntent.value = intent
    if (anchorEl !== undefined) {
      supportMessengerPickerAnchor.value = anchorEl
    }

    const draft =
      intent === 'deposit' ? depositSupportMessage.value.trim() : ''
    const messengerEntries = supportMessengerEntries.value
    const entries = pickerEntries.value

    // لیست خالی + چت خاموش → هیچ‌کار
    if (entries.length === 0) {
      return false
    }

    // فقط چت (لیست پیام‌رسان خالی) → مستقیم چت
    if (isChatEnabled.value && messengerEntries.length === 0) {
      return goToSupportChat()
    }

    // فقط یک گزینه (چت یا یک پیام‌رسان) → مستقیم همان
    if (entries.length === 1) {
      return openMessengerEntry(entries[0], draft)
    }

    // چند گزینه (چت + لینک‌ها یا چند پیام‌رسان) → منوی انتخاب
    const now = Date.now()
    if (supportPickerOpen.value) {
      if (now - supportPickerOpenedAt < 450) return true
      supportPickerOpen.value = false
      return true
    }

    supportPickerOpen.value = true
    supportPickerOpenedAt = now
    return true
  }

  async function openSupportMessenger(anchorEl?: HTMLElement | null) {
    return openSupportPicker('plain', anchorEl)
  }

  async function openDepositSupportMessenger(anchorEl?: HTMLElement | null) {
    return openSupportPicker('deposit', anchorEl)
  }

  function handleSupportMessengerClick(event?: Event) {
    const target = event?.currentTarget
    const anchor = target instanceof HTMLElement ? target : null
    void openSupportMessenger(anchor)
  }

  const depositSmsLink = computed(() =>
    buildDepositSmsUrl(
      supportMessengerSettings.value.depositSmsSupportNumber,
      depositSupportMessage.value,
    ),
  )

  const supportPhoneLink = computed(() => {
    const fromSettings = buildSupportPhoneUrl(
      supportMessengerSettings.value.depositSmsSupportNumber,
    )
    if (fromSettings) return fromSettings

    const legacy = legacySupportLink.value
    if (legacy.startsWith('tel:') && legacy.length > 4) return legacy

    return ''
  })

  const supportMessengerText = computed(() => resolveDepositGuideText())

  const depositCardNumberRaw = computed(() => {
    void settingsStore.settings
    const fromMessenger = supportMessengerSettings.value.depositCardNumber?.trim()
    if (fromMessenger) return fromMessenger
    return String(getDepositGuideVarsFromSettings().cardNumber ?? '').trim()
  })

  const depositShebaRaw = computed(() => {
    void settingsStore.settings
    const fromMessenger = supportMessengerSettings.value.depositSheba?.trim()
    if (fromMessenger) return fromMessenger
    return String(getDepositGuideVarsFromSettings().sheba ?? '').trim()
  })

  const depositCardNumber = computed(() => displayDepositCardNumber(depositCardNumberRaw.value))
  const depositSheba = computed(() => displayDepositSheba(depositShebaRaw.value))

  const depositCardLabel = computed(() => {
    void settingsStore.settings
    return getDepositSettingLabel('deposit_card_number', 'شماره کارت واریز')
  })

  const depositShebaLabel = computed(() => {
    void settingsStore.settings
    return getDepositSettingLabel('deposit_sheba', 'شبا واریز')
  })

  const hasDepositCardValue = computed(() => hasDepositFieldValue(depositCardNumberRaw.value))
  const hasDepositShebaValue = computed(() => hasDepositFieldValue(depositShebaRaw.value))

  async function copyDepositCardNumber() {
    await copyDepositFieldValue(
      depositCardNumberRaw.value,
      'card',
      'شماره کارت ثبت نشده است',
    )
  }

  async function copyDepositShebaNumber() {
    await copyDepositFieldValue(
      depositShebaRaw.value,
      'sheba',
      'شماره شبا ثبت نشده است',
    )
  }

  const hasMessengerLink = computed(
    () => isChatEnabled.value || supportMessengerEntries.value.length > 0,
  )
  const hasMultipleMessengers = computed(() => pickerEntries.value.length > 1)
  const hasSupportPhoneLink = computed(() => !!supportPhoneLink.value)
  const hasSupportActions = computed(() => hasSupportPhoneLink.value || hasMessengerLink.value)
  const opensInNewTab = computed(() => /^https?:\/\//i.test(messengerLink.value))

  return {
    supportPickerOpen,
    supportPickerAnchor: supportMessengerPickerAnchor,
    supportMessengerEntries: pickerEntries,
    isChatEnabled,
    messengerType,
    messengerMeta,
    messengerLink,
    supportPhoneLink,
    depositSmsLink,
    supportMessengerText,
    depositSupportMessage,
    depositCardNumber,
    depositSheba,
    depositCardNumberRaw,
    depositShebaRaw,
    depositCardLabel,
    depositShebaLabel,
    hasDepositCardValue,
    hasDepositShebaValue,
    copyDepositCardNumber,
    copyDepositShebaNumber,
    openSupportMessenger,
    openDepositSupportMessenger,
    openMessengerEntry,
    handleSupportMessengerClick,
    goToSupportChat,
    hasMessengerLink,
    hasMultipleMessengers,
    hasSupportPhoneLink,
    hasSupportActions,
    opensInNewTab,
    loadSupportMessengerFromSettings,
  }
}