import { computed, nextTick, onMounted, ref } from 'vue'

export default {
  name: 'TravelReimbursementCreateView',
  props: {
  initialPrompt: {
    type: String,
    default: ''
  },
  entrySource: {
    type: String,
    default: 'requests'
  },
  requestContext: {
    type: Object,
    default: null
  }
},
  emits: ['close'] ,
  setup(props, { emit }) {
    const DEFAULT_REQUEST = {
      id: 'BR240712001',
      reason: '客户方案汇报',
      city: '上海',
      period: '07-08 ~ 07-11',
      applyTime: '2024-07-07',
      amount: '¥3,680.00',
      node: '财务复核',
      approval: '主管审批中',
      travel: '已订酒店 / 机票'
    }

    const SOURCE_LABELS = {
      workbench: '来自个人工作台',
      topbar: '来自发起报销',
      detail: '来自智能录入',
      upload: '来自附件上传',
      requests: '来自报销列表'
    }

    let messageSeed = 0

    const fileInputRef = ref(null)
    const messageListRef = ref(null)
    const composerDraft = ref('')
    const attachedFiles = ref([])
    const messages = ref([])
    const currentInsight = ref({
      intent: 'welcome',
      confidence: 0,
      title: '',
      summary: '',
      welcome: { cards: [] }
    })

    const linkedRequest = computed(() => sanitizeRequest(props.requestContext))
    const sourceLabel = computed(() => SOURCE_LABELS[props.entrySource] ?? '来自 AI 工作台')
    const canSubmit = computed(() => Boolean(composerDraft.value.trim() || attachedFiles.value.length))
    const showInsightPanel = computed(() => currentInsight.value.intent !== 'welcome')
    const composerPlaceholder = computed(() => {
      if (props.entrySource === 'detail') {
        return `例如：帮我看一下 ${linkedRequest.value.id} 现在到哪个审批节点，或者补充超标说明。`
      }
      return '例如：帮我发起差旅报销、查一下审批节点，或者识别我刚上传的票据。'
    })
    const currentIntentLabel = computed(() => {
      const labels = {
        welcome: '等待输入',
        draft: '报销草稿',
        approval: '审批查询',
        recognition: '单据识别',
        note: '补充说明'
      }
      return labels[currentInsight.value.intent] ?? 'AI 处理中'
    })

    const shortcuts = computed(() => [
      { label: '查审批节点', icon: 'mdi mdi-timeline-clock-outline', prompt: `帮我看一下 ${linkedRequest.value.id} 现在到哪个审批节点了` },
      { label: '识别上传单据', icon: 'mdi mdi-file-search-outline', prompt: '我上传了几张票据，帮我识别并给出录入结果' },
      { label: '补充报销说明', icon: 'mdi mdi-text-box-edit-outline', prompt: `帮我给 ${linkedRequest.value.id} 补一段费用说明` },
      { label: '生成报销草稿', icon: 'mdi mdi-file-document-edit-outline', prompt: '我要发起一笔差旅费申请报销，请帮我先生成草稿' }
    ])

    messages.value = [
      createMessage(
        'assistant',
        buildGreeting(),
        []
      )
    ]

    onMounted(() => {
      currentInsight.value = buildWelcomeInsight()
      if (props.initialPrompt?.trim()) {
        composerDraft.value = props.initialPrompt.trim()
        submitComposer()
      } else {
        nextTick(scrollToBottom)
      }
    })

    function sanitizeRequest(request) {
      if (!request) return { ...DEFAULT_REQUEST }
      return {
        id: request.id ?? DEFAULT_REQUEST.id,
        reason: request.reason ?? DEFAULT_REQUEST.reason,
        city: request.city ?? DEFAULT_REQUEST.city,
        period: request.period ?? DEFAULT_REQUEST.period,
        applyTime: request.applyTime ?? DEFAULT_REQUEST.applyTime,
        amount: request.amount ?? DEFAULT_REQUEST.amount,
        node: request.node ?? DEFAULT_REQUEST.node,
        approval: request.approval ?? DEFAULT_REQUEST.approval,
        travel: request.travel ?? DEFAULT_REQUEST.travel
      }
    }

    function buildGreeting() {
      if (props.entrySource === 'detail') {
        return `已进入统一对话工作台，当前关联单据 ${linkedRequest.value.id}。你可以直接问审批节点、补充说明，或继续上传票据。`
      }
      return '这里是统一对话入口。你可以直接发起报销、查询审批节点，或者上传单据让我识别。'
    }

    function buildWelcomeInsight() {
      return {
        intent: 'welcome',
        confidence: 86,
        title: props.entrySource === 'detail' ? `已关联 ${linkedRequest.value.id}` : '先告诉我你要处理什么',
        summary: props.entrySource === 'detail'
          ? '右侧会跟随你的提问切换成审批状态、识别结果或补充说明界面。'
          : '无论是发起报销、查审批还是识别票据，这里都共用一个对话入口。',
        welcome: {
          cards: [
            { icon: 'mdi mdi-timeline-clock-outline', title: '审批查询', desc: '识别到审批、节点、状态等意图时，右侧切到流程状态。' },
            { icon: 'mdi mdi-file-search-outline', title: '票据识别', desc: '上传附件后展示识别结果、建议金额和缺失材料。' },
            { icon: 'mdi mdi-text-box-check-outline', title: '补充说明', desc: '补充超标、夜间交通、业务招待等说明时，右侧给出结构化备注。' }
          ]
        }
      }
    }

    function createMessage(role, text, attachments = []) {
      messageSeed += 1
      return {
        id: `msg-${messageSeed}`,
        role,
        text,
        attachments,
        time: nowTime()
      }
    }

    function nowTime() {
      return new Date().toLocaleTimeString('zh-CN', {
        hour: '2-digit',
        minute: '2-digit',
        hour12: false
      })
    }

    function triggerFileUpload() {
      fileInputRef.value?.click()
    }

    function handleFilesChange(event) {
      attachedFiles.value = Array.from(event.target.files ?? [])
    }

    function runShortcut(prompt) {
      composerDraft.value = prompt
      submitComposer()
    }

    function submitComposer() {
      if (!canSubmit.value) return

      const rawText = composerDraft.value.trim()
      const fileNames = attachedFiles.value.map((file) => file.name)
      const userText = rawText || `我上传了 ${fileNames.length} 份单据，请帮我识别并录入。`

      messages.value.push(createMessage('user', userText, fileNames))

      const insight = analyzeIntent(userText, fileNames)
      currentInsight.value = insight
      messages.value.push(createMessage('assistant', insight.reply))

      composerDraft.value = ''
      attachedFiles.value = []
      if (fileInputRef.value) {
        fileInputRef.value.value = ''
      }

      nextTick(scrollToBottom)
    }

    function scrollToBottom() {
      if (!messageListRef.value) return
      messageListRef.value.scrollTop = messageListRef.value.scrollHeight
    }

    function analyzeIntent(text, files) {
      if (isRecognitionIntent(text, files)) return buildRecognitionInsight(text, files)
      if (isApprovalIntent(text)) return buildApprovalInsight(text)
      if (isNoteIntent(text)) return buildNoteInsight(text)
      return buildDraftInsight(text, files)
    }

    function isRecognitionIntent(text, files) {
      return files.length > 0 || /(上传|附件|票据|发票|单据|识别|ocr)/i.test(text)
    }

    function isApprovalIntent(text) {
      return /(审批|节点|状态|进度|流程|卡在哪|到哪了|通过了吗|驳回)/.test(text)
    }

    function isNoteIntent(text) {
      return /(说明|备注|补充|原因|超标|夜间|特殊情况|备注一下)/.test(text)
    }

    function buildApprovalInsight(text) {
      const requestId = extractRequestId(text) || linkedRequest.value.id
      const timeline = [
        { label: '提交申请', time: `${linkedRequest.value.applyTime} 09:18`, state: 'done' },
        { label: '票据识别', time: `${linkedRequest.value.applyTime} 09:22`, state: 'done' },
        { label: '直属主管审批', time: '今天 10:46', state: 'done' },
        { label: linkedRequest.value.node, time: '进行中', state: 'current' },
        { label: '归档入账', time: '待处理', state: 'pending' }
      ]

      return {
        intent: 'approval',
        confidence: 95,
        title: `${requestId} 的审批状态`,
        summary: `当前在 ${linkedRequest.value.node}，右侧已经切到流程状态界面。`,
        reply: `我识别到你是在查询审批节点。${requestId} 当前处于 ${linkedRequest.value.node}，下一步预计由财务在今天 17:30 前处理。`,
        status: {
          requestId,
          currentStatus: linkedRequest.value.approval,
          currentNode: linkedRequest.value.node,
          nextOwner: '财务共享中心 · 王敏',
          eta: '今天 17:30 前',
          timeline,
          actions: [
            '若 17:30 后仍未推进，可提醒财务共享中心处理。',
            '当前不建议重复提交，避免流程串单。',
            '如果要补充说明，直接在当前对话里继续输入即可。'
          ]
        }
      }
    }

    function buildRecognitionInsight(text, files) {
      const requestId = extractRequestId(text) || linkedRequest.value.id
      const receipts = buildReceiptItems(text, files)
      const total = receipts.reduce((sum, item) => sum + parseCurrency(item.amount), 0)
      const amount = formatCurrency(total || guessAmount(text) || 3680)
      const completeness = files.length >= 2 ? '资料较完整' : '仍需补件'

      return {
        intent: 'recognition',
        confidence: files.length ? 97 : 90,
        title: '已切换到单据识别视图',
        summary: `识别到 ${receipts.length} 条候选费用，建议关联到 ${requestId}。`,
        reply: `我识别到你是在上传或识别单据。右侧已经展示识别结果、建议金额和缺失材料。`,
        recognition: {
          state: files.length ? '识别完成' : '待补附件',
          requestId,
          fileCount: Math.max(files.length, 1),
          amount,
          completeness,
          receipts,
          suggestions: [
            files.length ? '可直接生成费用明细草稿。' : '建议补传票据原件，识别结果会更稳定。',
            '金额和费用分类已经给出，确认后即可写入报销单。',
            '如果有多张单据属于同一行程，可以继续上传，右侧会合并结果。'
          ]
        }
      }
    }

    function buildNoteInsight(text) {
      const requestId = extractRequestId(text) || linkedRequest.value.id
      const noteType = /超标|夜间/.test(text) ? '特殊场景说明' : '补充报销说明'
      const generatedNote = /超标|夜间/.test(text)
        ? '因客户会议结束较晚，产生夜间交通费用，已保留行程截图与打车凭证，申请按实际发生金额报销。'
        : '本次费用与客户现场沟通及方案汇报直接相关，单据与行程已对应关联，请按当前草稿继续流转。'

      return {
        intent: 'note',
        confidence: 93,
        title: `${requestId} 的补充说明`,
        summary: `识别到你是在补充备注，右侧切到说明整理界面。`,
        reply: `我识别到你是在补充说明。右侧已经生成结构化备注，可直接作为对应单号的附加说明。`,
        note: {
          requestId,
          state: noteType,
          generatedNote,
          impacts: [
            '会同步显示给当前审批节点处理人。',
            '若涉及超标或夜间交通，审批意见会优先查看这段说明。',
            '继续补充金额、参与人或业务背景时，我会自动更新说明版本。'
          ],
          owner: linkedRequest.value.node,
          nextAction: '继续补充或提交当前说明'
        }
      }
    }

    function buildDraftInsight(text, files) {
      const requestId = linkedRequest.value.id
      const items = buildDraftItems(text, files)
      const total = items.reduce((sum, item) => sum + parseCurrency(item.amount), 0)

      return {
        intent: 'draft',
        confidence: 91,
        title: '已切换到报销草稿视图',
        summary: '识别到你是在发起报销或继续填写草稿，右侧展示当前建议明细。',
        reply: '我识别到你是在发起或继续整理报销。右侧已经切到草稿视图，展示建议费用明细和待补信息。',
        draft: {
          state: files.length ? '可继续完善' : '草稿已生成',
          requestId,
          type: inferDraftType(text),
          amount: formatCurrency(total || guessAmount(text) || 3280),
          progress: files.length ? '已录入基础信息' : '待补票据',
          items,
          missing: [
            '补充至少一份原始票据或行程截图。',
            '确认出差事由、城市和发生日期是否完整。',
            '如有业务招待或特殊交通，请补充关联说明。'
          ]
        }
      }
    }

    function extractRequestId(text) {
      return text.match(/BR\d{6,}/i)?.[0] ?? ''
    }

    function inferDraftType(text) {
      if (/招待|客户|用餐/.test(text)) return '业务招待报销'
      if (/交通|打车|高铁|机票/.test(text)) return '交通费用报销'
      return '差旅费申请报销'
    }

    function buildDraftItems(text, files) {
      const items = []

      if (/高铁|火车|车票/.test(text)) {
        items.push({ name: '高铁 / 火车票', desc: '建议录入为城际交通', amount: '¥236.00', tag: '交通' })
      }
      if (/机票|航班/.test(text)) {
        items.push({ name: '机票', desc: '建议录入为航空出行', amount: '¥1,280.00', tag: '交通' })
      }
      if (/酒店|住宿/.test(text)) {
        items.push({ name: '酒店住宿', desc: '建议录入为住宿费用', amount: '¥780.00', tag: '住宿' })
      }
      if (/打车|出租车|网约车/.test(text)) {
        items.push({ name: '市内交通', desc: '建议合并同日打车订单', amount: '¥126.00', tag: '交通' })
      }
      if (/餐|招待|客户/.test(text)) {
        items.push({ name: '业务招待', desc: '建议补充参与人和业务目的', amount: '¥860.00', tag: '招待' })
      }

      if (!items.length) {
        items.push({
          name: '差旅综合费用',
          desc: files.length ? '已根据附件生成候选明细' : '根据描述先生成一版草稿',
          amount: files.length ? '¥3,280.00' : '¥2,680.00',
          tag: '草稿'
        })
      }

      return items
    }

    function buildReceiptItems(text, files) {
      if (files.length) {
        return files.map((file, index) => {
          const type = inferFileType(file, text, index)
          const baseAmount = guessAmount(file) || guessAmount(text) || (index + 1) * 180 + 120
          return {
            name: file,
            type,
            amount: formatCurrency(baseAmount),
            confidence: `${92 - index}%`
          }
        })
      }

      return buildDraftItems(text, files).map((item, index) => ({
        name: item.name,
        type: item.tag,
        amount: item.amount,
        confidence: `${94 - index}%`
      }))
    }

    function inferFileType(fileName, text, index) {
      const name = `${fileName} ${text}`
      if (/酒店|住宿/.test(name)) return '住宿单据'
      if (/机票|航班/.test(name)) return '航空出行'
      if (/高铁|火车|车票/.test(name)) return '城际交通'
      if (/打车|出租车|网约车/.test(name)) return '市内交通'
      return index === 0 ? '费用主票据' : '补充附件'
    }

    function guessAmount(text) {
      const match = String(text).match(/(\d+(?:\.\d{1,2})?)/)
      return match ? Number.parseFloat(match[1]) : 0
    }

    function parseCurrency(value) {
      return Number.parseFloat(String(value).replace(/[^\d.]/g, '')) || 0
    }

    function formatCurrency(value) {
      return `¥${Number(value).toFixed(2)}`
    }

    return {
      emit,
      fileInputRef,
      messageListRef,
      composerDraft,
      attachedFiles,
      messages,
      currentInsight,
      linkedRequest,
      sourceLabel,
      canSubmit,
      showInsightPanel,
      composerPlaceholder,
      currentIntentLabel,
      shortcuts,
      triggerFileUpload,
      handleFilesChange,
      runShortcut,
      submitComposer
    }
  }
}