import {
  clearBookingState,
  clearMyRoomData,
  getCurrentUser,
  getLoginStatus,
  saveBookingList,
  saveCurrentBooking,
  saveEffectiveContracts,
  saveCurrentUser,
  saveMyRoomData,
  savePendingContractCount,
  savePendingContracts,
  saveRegisteredUser,
  setCheckedInStatus
} from './app-state'
import {
  getMyEffectiveContracts,
  getMyPendingSignContracts,
  orderSearchedMePage
} from '@/api/index.js'
import store from '@/store'
import {
  normalizeBookingList,
  parseOrderListResponse,
  pickCurrentBooking,
  pickCurrentStayOrder
} from './booking-helper'
import { getCurrentLanguage } from './i18n'

const SYNC_TTL = 3000

let syncStayStatePromise = null
let lastSyncStayStateAt = 0

function getSessionSyncText(key = '') {
  const isEn = getCurrentLanguage() === 'en'
  const map = {
    pendingContract: isEn ? 'Pending Contract Signature' : '待签合同'
  }

  return map[key] || ''
}

function parseContractList(response) {
  const payload = response && response.data ? response.data : response

  if (Array.isArray(payload)) {
    return payload
  }

  if (payload && Array.isArray(payload.data)) {
    return payload.data
  }

  if (payload && payload.data && Array.isArray(payload.data.data)) {
    return payload.data.data
  }

  return []
}

function buildLeaseText(order = {}) {
  const start = String(order.startDate || order.start || order.checkinDate || '').slice(0, 10)
  const end = String(order.endDate || order.end || order.checkoutDate || '').slice(0, 10)

  if (start && end) {
    return `${start} - ${end}`
  }

  return start || end || ''
}

function mapOrderToRoomData(order = {}) {
  const imageUrls = Array.isArray(order.imageUrls)
    ? order.imageUrls
    : typeof order.imageUrls === 'string'
      ? order.imageUrls.split(',').map(item => item.trim()).filter(Boolean)
      : []

  const roomLabel = [
    order.buildingName || order.buildingSectionName || order.unitName || '',
    order.roomNo || order.roomCode || order.roomName || ''
  ].filter(Boolean).join(' ')

  const title = [
    order.areaName || order.campusName || '',
    order.roomTypeName || order.roomType || ''
  ].filter(Boolean).join(' · ')

  return {
    ...order,
    id: roomLabel || order.roomNo || order.roomCode || order.orderNo || '',
    roomLabel: roomLabel || order.roomNo || order.roomCode || '',
    titleZh: title || order.roomTypeName || order.roomName || '当前入住房间',
    titleEn: order.roomTypeNameEn || title || order.roomTypeName || 'Current Stay',
    leaseText: buildLeaseText(order),
    image: order.imageUrl || imageUrls[0] || ''
  }
}

function pickFirstValue(...values) {
  for (let index = 0; index < values.length; index += 1) {
    const value = values[index]
    if (value === undefined || value === null) {
      continue
    }
    const text = String(value).trim()
    if (text) {
      return text
    }
  }
  return ''
}

function buildPendingContractQuery(order = {}) {
  const safeOrder = order || {}
  const orderNo = pickFirstValue(safeOrder.orderNo, safeOrder.no, safeOrder.code, safeOrder.OrderNo)
  if (!orderNo) {
    return null
  }
  return {
    ProviderType: 'WechatMiniProgram',
    OrderNo: orderNo
  }
}

function buildEffectiveContractQuery(order = {}) {
  const safeOrder = order || {}
  const orderNo = pickFirstValue(safeOrder.orderNo, safeOrder.no, safeOrder.code, safeOrder.OrderNo)
  if (!orderNo) {
    return null
  }
  return {
    OrderNo: orderNo
  }
}

function enrichBookingLanguageFields(booking = {}) {
  if (!booking || typeof booking !== 'object') {
    return booking
  }
  return {
    ...booking,
    statusTextZh: booking.statusTextZh || '待签合同',
    statusTextEn: booking.statusTextEn || 'Pending Contract Signature'
  }
}

function buildContractStepBooking(pendingContracts = []) {
  const contract = Array.isArray(pendingContracts) ? pendingContracts[0] : null
  if (!contract || typeof contract !== 'object') {
    return null
  }

  return {
    ...contract,
    orderNo: contract.orderNo || contract.OrderNo || '',
    roomName: contract.roomName || contract.roomTypeName || contract.houseTypeName || '',
    roomTypeName: contract.roomTypeName || contract.houseTypeName || contract.roomName || '',
    startDate: contract.start || contract.startDate || '',
    endDate: contract.end || contract.endDate || '',
    status: 'contract_pending_sign',
    statusKey: 'contract_pending_sign',
    statusCode: 10,
    statusText: getSessionSyncText('pendingContract'),
    statusTextZh: '待签合同',
    statusTextEn: 'Pending Contract Signature'
  }
}

function syncStoredUser(hasCheckedIn, currentOrder, currentBooking) {
  const user = getCurrentUser()

  if (!user || typeof user !== 'object' || !Object.keys(user).length) {
    return
  }

  const nextUser = {
    ...user,
    hasCheckedIn,
    currentOrder: currentOrder || null,
    currentBooking: currentBooking || null,
    bookingStatus: currentBooking ? (currentBooking.status || currentBooking.statusKey || 'none') : 'none',
    bookingRejectReason: currentBooking ? (currentBooking.rejectReasonText || currentBooking.rejectReason || '') : ''
  }

  saveCurrentUser(nextUser)
  saveRegisteredUser(nextUser)

  if (store && store.commit) {
    store.commit('$tStore', {
      name: 'vuex_user',
      value: {
        ...(store.state && store.state.vuex_user ? store.state.vuex_user : {}),
        ...nextUser
      }
    })
  }
}

function syncStoreState({
  hasCheckedIn = false,
  currentOrder = null,
  pendingContracts = [],
  effectiveContracts = [],
  orderList = []
} = {}) {
  if (!store || !store.commit) {
    return
  }

  store.commit('$tStore', {
    name: 'vuex_checkin_status',
    value: !!hasCheckedIn
  })
  store.commit('$tStore', {
    name: 'vuex_current_order',
    value: currentOrder || null
  })
  store.commit('$tStore', {
    name: 'vuex_pending_contracts',
    value: Array.isArray(pendingContracts) ? pendingContracts : []
  })
  store.commit('$tStore', {
    name: 'vuex_pending_contract_count',
    value: Array.isArray(pendingContracts) ? pendingContracts.length : 0
  })
  store.commit('$tStore', {
    name: 'vuex_effective_contracts',
    value: Array.isArray(effectiveContracts) ? effectiveContracts : []
  })
  store.commit('$tStore', {
    name: 'vuex_valid_orders',
    value: Array.isArray(orderList) ? orderList : []
  })
}

function requestStayState(language = 'zh') {
  return orderSearchedMePage({
    PageIndex: 1,
    PageSize: 100,
    IsExport: false
  }, language)
    .then((orderResponse) => {
      const orderList = normalizeBookingList(parseOrderListResponse(orderResponse), language)
      const currentOrder = pickCurrentStayOrder(orderList)
      const pendingContractQuery = buildPendingContractQuery(currentOrder)
      const effectiveContractQuery = buildEffectiveContractQuery(currentOrder)

      return Promise.all([
        Promise.resolve(orderList),
        Promise.resolve(currentOrder),
        pendingContractQuery
          ? getMyPendingSignContracts(pendingContractQuery, language).catch(() => [])
          : Promise.resolve([]),
        effectiveContractQuery
          ? getMyEffectiveContracts(effectiveContractQuery, language).catch(() => [])
          : Promise.resolve([])
      ])
    })
    .then(([orderList, currentOrder, pendingContractsResponse, effectiveContractsResponse]) => {
      const pendingContracts = parseContractList(pendingContractsResponse)
      const effectiveContracts = parseContractList(effectiveContractsResponse)
      const currentBooking = enrichBookingLanguageFields(pickCurrentBooking(orderList) || buildContractStepBooking(pendingContracts))

      return {
        hasCheckedIn: !!currentOrder,
        currentOrder,
        currentBooking,
        orderList,
        pendingContracts,
        effectiveContracts
      }
    })
}

export function syncLoginStayState(options = {}) {
  const { language = 'zh', force = false } = options

  if (!getLoginStatus()) {
    return Promise.resolve({
      hasCheckedIn: false,
      currentOrder: null,
      currentBooking: null,
      orderList: []
    })
  }

  const now = Date.now()

  if (!force && syncStayStatePromise) {
    return syncStayStatePromise
  }

  if (!force && lastSyncStayStateAt && now - lastSyncStayStateAt < SYNC_TTL) {
    return Promise.resolve({
      skipped: true
    })
  }

  const syncSource = store && store.dispatch
    ? store.dispatch('fetchUserGlobalStatus', {
      force,
      language
    })
    : requestStayState(language)

  syncStayStatePromise = syncSource
    .then((result = {}) => {
      const orderList = Array.isArray(result.orderList)
        ? result.orderList
        : (Array.isArray(result.validOrders) ? result.validOrders : [])
      const pendingContracts = Array.isArray(result.pendingContracts) ? result.pendingContracts : []
      const effectiveContracts = Array.isArray(result.effectiveContracts) ? result.effectiveContracts : []
      const currentOrder = result.currentOrder || pickCurrentStayOrder(orderList)
      const currentBooking = enrichBookingLanguageFields(result.currentBooking || pickCurrentBooking(orderList) || buildContractStepBooking(pendingContracts))
      const hasCheckedIn = typeof result.hasCheckedIn === 'boolean'
        ? result.hasCheckedIn
        : !!currentOrder

      saveBookingList(orderList)
      if (currentBooking) {
        saveCurrentBooking(currentBooking)
      } else {
        clearBookingState()
        saveBookingList(orderList)
      }
      setCheckedInStatus(hasCheckedIn)
      savePendingContracts(pendingContracts)
      savePendingContractCount(pendingContracts.length)
      saveEffectiveContracts(effectiveContracts)

      if (hasCheckedIn) {
        saveMyRoomData(mapOrderToRoomData(currentOrder))
      } else {
        clearMyRoomData()
      }

      syncStoreState({
        hasCheckedIn,
        currentOrder,
        pendingContracts,
        effectiveContracts,
        orderList
      })
      syncStoredUser(hasCheckedIn, currentOrder, currentBooking)
      lastSyncStayStateAt = Date.now()

      return {
        hasCheckedIn,
        currentOrder,
        currentBooking,
        orderList,
        pendingContracts,
        effectiveContracts
      }
    })
    .finally(() => {
      syncStayStatePromise = null
    })

  return syncStayStatePromise
}