import { computed, ref } from 'vue'

import { useNavigation, navItems } from './useNavigation.js'
import { useRequests } from './useRequests.js'
import { useChat } from './useChat.js'
import { useToast } from './useToast.js'
import { documents } from '../data/requests.js'

export function useAppShell() {
  const loggedIn = ref(false)
  const travelCreateMode = ref(false)
  const detailMode = ref(false)
  const selectedTravelRequest = ref(null)
  const smartEntryOpen = ref(false)
  const smartEntryContext = ref({ prompt: '', source: 'requests', request: null })
  const smartEntrySessionId = ref(0)

  const { activeView, currentView, setView } = useNavigation()
  const { requests, search, filters, ranges, activeRange, filteredRequests, approveRequest, rejectRequest } = useRequests()
  const { messages, draft, uploadedFiles, messageList, activeCase, prompts, sendMessage, handleUpload, openChat, openNewChat } = useChat(activeView)
  const { toastText, toast } = useToast()

  const docSearch = ref('')
  const customRange = ref({ start: '2024-07-06', end: '2024-07-12' })
  const travelPrompts = ['帮我提交出差申请', '预订机票', '预订酒店', '预订火车票', '查询差旅政策']

  const topBarView = computed(() => {
    if (detailMode.value) {
      return {
        title: '差旅报销详情',
        desc: '查看报销单据详情、票据识别与审批进度'
      }
    }
    return currentView.value
  })

  const filteredDocuments = computed(() => {
    const key = docSearch.value.trim().toLowerCase()
    return documents.filter((doc) => {
      const matchesSearch = !key || `${doc.id}${doc.applicant}${doc.destination}${doc.type}`.toLowerCase().includes(key)
      return matchesSearch
    })
  })

  function handleLogin(credentials) {
    if (credentials.username && credentials.password) {
      loggedIn.value = true
    }
  }

  function handleRecoverPassword() {
    toast('请联系系统管理员重置密码。')
  }

  function handleSsoLogin() {
    toast('SSO 登录通道建设中。')
  }

  function handleApprove(request) {
    const msg = approveRequest(request)
    toast(msg)
  }

  function handleReject(request) {
    const msg = rejectRequest(request)
    toast(msg)
  }

  function handleNavigate(view) {
    travelCreateMode.value = false
    detailMode.value = false
    selectedTravelRequest.value = null
    smartEntryOpen.value = false
    setView(view)
  }

  function handleOpenChat(request) {
    travelCreateMode.value = false
    openChat(request)
  }

  function openTravelCreate() {
    smartEntryOpen.value = true
    travelCreateMode.value = false
    detailMode.value = false
    selectedTravelRequest.value = null
    smartEntryContext.value = { prompt: '', source: 'topbar', request: null }
    smartEntrySessionId.value += 1
  }

  function openSmartEntry(payload = {}) {
    smartEntryOpen.value = true
    travelCreateMode.value = false
    if (payload.source !== 'detail') {
      detailMode.value = false
      selectedTravelRequest.value = null
    }
    smartEntryContext.value = {
      prompt: payload.prompt ?? '',
      source: payload.source ?? 'workbench',
      request: payload.request ?? selectedTravelRequest.value
    }
    smartEntrySessionId.value += 1
  }

  function closeSmartEntry() {
    smartEntryOpen.value = false
  }

  function openRequestDetail(request) {
    selectedTravelRequest.value = request
    detailMode.value = true
    activeView.value = 'requests'
  }

  function closeRequestDetail() {
    detailMode.value = false
    selectedTravelRequest.value = null
  }

  return {
    activeCase,
    activeRange,
    activeView,
    closeRequestDetail,
    closeSmartEntry,
    currentView,
    customRange,
    detailMode,
    docSearch,
    draft,
    filteredDocuments,
    filteredRequests,
    filters,
    handleApprove,
    handleLogin,
    handleNavigate,
    handleOpenChat,
    handleRecoverPassword,
    handleReject,
    handleSsoLogin,
    handleUpload,
    loggedIn,
    messageList,
    messages,
    navItems,
    openChat,
    openNewChat,
    openRequestDetail,
    openSmartEntry,
    openTravelCreate,
    prompts,
    ranges,
    requests,
    search,
    selectedTravelRequest,
    sendMessage,
    setView,
    smartEntryContext,
    smartEntryOpen,
    smartEntrySessionId,
    toast,
    toastText,
    topBarView,
    travelCreateMode,
    travelPrompts,
    uploadedFiles
  }
}