import { computed, inject, onMounted, provide, ref, type ComponentPublicInstance, type InjectionKey } from 'vue'
import { useIntersectionObserver } from '@vueuse/core'
import { useDesktopBreakpoint } from '@/layouts/composables/useAppLayout'
import { getProductsCatalog, getProductsCatalogRef } from '@/composables/useProductsCatalog'
import { loading, loadingMore } from '@/utils'
import {
  BOURSECU_TRANSACTION_TABS,
  getBoursecuStatusFilterGroup,
  getBoursecuStatusOptionsForTab,
  type BoursecuTradeSide,
  type BoursecuTransactionTab,
  type BoursecuTransactionTabId,
} from '../config/boursecuTabs'
import {
  getActiveBoursecuTab,
  initTransactionsPageData,
  loadMoreTransactions,
  reloadTransactionsTable,
  resetTransactionsPagination,
  transactionActiveTabId,
  transactionDateFilter,
  transactionDateFromFilter,
  transactionDateToFilter,
  transactionItems,
  transactionPagination,
  transactionStatusFilter,
  transactionProductFilter,
  transactionTableOutput,
  transactionTradeSide,
  transactionsBoursecuMode,
} from './useTransactionsPageData'

export interface TransactionsPageContext {
  pagination: typeof transactionPagination
  items: typeof transactionItems
  tableOutput: typeof transactionTableOutput
  showFilter: ReturnType<typeof ref<boolean>>
  dateFilter: typeof transactionDateFilter
  dateFromFilter: typeof transactionDateFromFilter
  dateToFilter: typeof transactionDateToFilter
  statusFilter: typeof transactionStatusFilter
  productFilter: typeof transactionProductFilter
  productOptions: ReturnType<typeof computed<{ value: number; label: string }[]>>
  showProductFilter: ReturnType<typeof computed<boolean>>
  mobileObserverEl: ReturnType<typeof ref<HTMLElement | null>>
  desktopObserverEl: ReturnType<typeof ref<HTMLElement | null>>
  activeTabId: typeof transactionActiveTabId
  tradeSide: typeof transactionTradeSide
  activeTab: ReturnType<typeof computed<BoursecuTransactionTab>>
  statusOptions: ReturnType<typeof computed<ReturnType<typeof getBoursecuStatusOptionsForTab>>>
  emptyText: ReturnType<typeof computed<string>>
  resetPagination: typeof resetTransactionsPagination
  initTable: () => Promise<void>
  reloadTable: typeof reloadTransactionsTable
  applyFilter: () => Promise<void>
  setActiveTab: (tabId: BoursecuTransactionTabId) => Promise<void>
  setTradeSide: (side: BoursecuTradeSide) => Promise<void>
  applyInlineFilters: () => Promise<void>
  bindMobileObserver: (el: Element | ComponentPublicInstance | null) => void
  bindDesktopObserver: (el: Element | ComponentPublicInstance | null) => void
}

export const TRANSACTIONS_PAGE_KEY: InjectionKey<TransactionsPageContext> =
  Symbol('transactionsPage')

export function useTransactionsPageProvider(options?: { boursecu?: boolean }) {
  const isBoursecu = options?.boursecu ?? false
  const isDesktop = useDesktopBreakpoint()
  const showFilter = ref(false)
  const mobileObserverEl = ref<HTMLElement | null>(null)
  const desktopObserverEl = ref<HTMLElement | null>(null)

  const activeObserverEl = computed(() =>
    isDesktop.value ? desktopObserverEl.value : mobileObserverEl.value,
  )

  const activeTab = computed<BoursecuTransactionTab>(
    () =>
      BOURSECU_TRANSACTION_TABS.find((tab) => tab.id === transactionActiveTabId.value) ??
      BOURSECU_TRANSACTION_TABS[0],
  )

  const statusOptions = computed(() => getBoursecuStatusOptionsForTab(activeTab.value))

  const productOptions = computed(() =>
    getProductsCatalogRef().value
      .filter((product) => product.active && product.show)
      .map((product) => ({
        value: product.id,
        label: product.title,
      })),
  )

  const showProductFilter = computed(
    () => transactionsBoursecuMode.value && activeTab.value.id !== 'deposit',
  )

  const emptyText = computed(() => {
    if (!transactionsBoursecuMode.value) {
      return 'تراکنشی موجود نیست'
    }

    if (activeTab.value.id === 'trades' && transactionTradeSide.value === 'sell') {
      return 'معامله فروشی برای شما به ثبت نرسیده است'
    }

    return activeTab.value.emptyText
  })

  async function initTable() {
    await reloadTransactionsTable()
  }

  async function applyFilter() {
    await reloadTransactionsTable()
    showFilter.value = false
  }

  async function setActiveTab(tabId: BoursecuTransactionTabId) {
    if (transactionActiveTabId.value === tabId) {
      return
    }

    const currentTab = activeTab.value
    const nextTab =
      BOURSECU_TRANSACTION_TABS.find((tab) => tab.id === tabId) ?? BOURSECU_TRANSACTION_TABS[0]

    if (getBoursecuStatusFilterGroup(currentTab) !== getBoursecuStatusFilterGroup(nextTab)) {
      transactionStatusFilter.value = undefined
    }

    transactionActiveTabId.value = tabId
    await reloadTransactionsTable()
  }

  async function setTradeSide(side: BoursecuTradeSide) {
    if (transactionTradeSide.value === side) {
      return
    }

    transactionTradeSide.value = side
    if (getActiveBoursecuTab().showTradeToggle) {
      await reloadTransactionsTable()
    }
  }

  async function applyInlineFilters() {
    await reloadTransactionsTable()
  }

  function resolveObserverElement(el: Element | ComponentPublicInstance | null) {
    if (!el) return null
    if (el instanceof HTMLElement) return el
    const root = (el as ComponentPublicInstance).$el
    return root instanceof HTMLElement ? root : null
  }

  function bindMobileObserver(el: Element | ComponentPublicInstance | null) {
    mobileObserverEl.value = resolveObserverElement(el)
  }

  function bindDesktopObserver(el: Element | ComponentPublicInstance | null) {
    desktopObserverEl.value = resolveObserverElement(el)
  }

  useIntersectionObserver(
    activeObserverEl,
    async ([entry]) => {
      if (entry?.isIntersecting) {
        await loadMoreTransactions()
      }
    },
    {
      root: null,
      rootMargin: '300px',
      threshold: 0.01,
    },
  )

  onMounted(async () => {
    if (isBoursecu) {
      await getProductsCatalog()
    }
    await initTransactionsPageData(isBoursecu)
  })

  const context: TransactionsPageContext = {
    pagination: transactionPagination,
    items: transactionItems,
    tableOutput: transactionTableOutput,
    showFilter,
    dateFilter: transactionDateFilter,
    dateFromFilter: transactionDateFromFilter,
    dateToFilter: transactionDateToFilter,
    statusFilter: transactionStatusFilter,
    productFilter: transactionProductFilter,
    productOptions,
    showProductFilter,
    mobileObserverEl,
    desktopObserverEl,
    activeTabId: transactionActiveTabId,
    tradeSide: transactionTradeSide,
    activeTab,
    statusOptions,
    emptyText,
    resetPagination: resetTransactionsPagination,
    initTable,
    reloadTable: reloadTransactionsTable,
    applyFilter,
    setActiveTab,
    setTradeSide,
    applyInlineFilters,
    bindMobileObserver,
    bindDesktopObserver,
  }

  provide(TRANSACTIONS_PAGE_KEY, context)
  return context
}

export function useTransactionsPageContext() {
  const context = inject(TRANSACTIONS_PAGE_KEY)
  if (!context) {
    throw new Error('useTransactionsPageContext must be used within useTransactionsPageProvider')
  }
  return context
}

/** @deprecated Use useTransactionsPageProvider in index + useTransactionsPageContext in views. */
export function useTransactionsPage(options?: { boursecu?: boolean }) {
  return useTransactionsPageProvider(options)
}