<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'
import { ElMessage } from 'element-plus'
import { useModelSettings } from './settings/useModelSettings'
import { fetchKnowledgeBases, createKnowledgeBase as apiCreateKnowledgeBase, deleteKnowledgeBase as apiDeleteKnowledgeBase, fetchKnowledgeDocuments } from './knowledge/useKnowledge'
import './knowledge/knowledge.css'

// 获取已配置的模型列表
const { models, fetchModels } = useModelSettings()

// 页面加载时获取数据
onMounted(async () => {
  fetchModels()
  await fetchKbList()
})

// 获取知识库列表
const knowledgeBases = ref<any[]>([])
const loadingKb = ref(false)

const fetchKbList = async () => {
  loadingKb.value = true
  try {
    const data = await fetchKnowledgeBases()
    knowledgeBases.value = data
  } finally {
    loadingKb.value = false
  }
}

// 筛选 LLM (chat) 模型
const llmModels = computed(() => {
  return models.value.filter((m: any) => m.model_type === 'chat')
})

// 筛选 Embedding 模型
const embeddingModels = computed(() => {
  return models.value.filter((m: any) => m.model_type === 'embedding')
})

// 步骤验证
const step1Valid = computed(() => !!newKbForm.value.name.trim())
const step2Valid = computed(() => !!modelConfig.value.llmModelId && !!modelConfig.value.embeddingModelId)
const step3Valid = computed(() => {
  // Parsing - 如果选择 docling，则需要填写 URL
  if (parsingConfig.value.engine === 'docling') {
    return !!parsingConfig.value.doclingUrl.trim()
  }
  return true
})
const step4Valid = computed(() => {
  // Local 存储不需要额外配置
  if (storageConfig.value.type === 'local') {
    return true
  }
  // MinIO 存储需要填写所有字段
  if (storageConfig.value.type === 'minio') {
    return !!(storageConfig.value.endpoint && storageConfig.value.accessKeyId && storageConfig.value.secretAccessKey && storageConfig.value.bucket)
  }
  // S3 暂时默认通过
  return true
})

// 获取当前步骤是否有效
const isCurrentStepValid = computed(() => {
  switch (createStep.value) {
    case 1: return step1Valid.value
    case 2: return step2Valid.value
    case 3: return step3Valid.value
    case 4: return step4Valid.value
    default: return false
  }
})

// 步骤是否可以点击（只能点击当前步骤或已完成的步骤）
const canClickStep = (step: number) => {
  if (step === 1) return true
  if (step === createStep.value) return true
  // 可以点击已完成的前面的步骤
  if (step < createStep.value) {
    switch (step) {
      case 1: return step1Valid.value
      case 2: return step2Valid.value
      case 3: return step3Valid.value
      case 4: return step4Valid.value
      default: return false
    }
  }
  return false
}

// 下一步
const nextStep = () => {
  if (!isCurrentStepValid.value) {
    ElMessage.warning('Please complete the current step first')
    return
  }
  if (createStep.value < 4) {
    createStep.value++
  }
}

// 上一步
const prevStep = () => {
  if (createStep.value > 1) {
    createStep.value--
  }
}

const loading = ref(false)
const searchQuery = ref('')

// 筛选知识库
const filteredKnowledgeBases = () => {
  if (!searchQuery.value) return knowledgeBases.value
  const query = searchQuery.value.toLowerCase()
  return knowledgeBases.value.filter(kb =>
    kb.name.toLowerCase().includes(query) ||
    kb.description.toLowerCase().includes(query)
  )
}

// 新建知识库 - 分步骤
const showCreateDialog = ref(false)
const createStep = ref(1)

// 文件上传弹窗
const showFileUploadDialog = ref(false)
const selectedKnowledge = ref<any>(null)
const fileFilter = ref('all') // all, parsed, parsing, failed
const selectedFile = ref<any>(null) // 当前选中的文件ID
const selectedDocument = ref<any>(null) // 当前选中的文档详情
const knowledgeDocuments = ref<any[]>([]) // 知识库文档列表
const loadingDocuments = ref(false)
const fileInput = ref<HTMLInputElement | null>(null)
const uploading = ref(false)
const previewUrl = ref('') // 文档预览URL (blob URL)
const previewDownloadUrl = ref('') // 原始下载链接
const loadingPreview = ref(false)
const previewPage = ref(1) // 当前页码
const previewTotalPages = ref(1) // 总页数

// 使用代理接口加载PDF
const loadPdfWithProxy = async (doc: any): Promise<string> => {
  if (!selectedKnowledge.value || !doc.file_key) {
    return ''
  }

  try {
    const { getFileProxyUrl } = await import('./knowledge/useKnowledge')
    const proxyUrl = getFileProxyUrl(selectedKnowledge.value.id, doc.file_key)
    console.log('Using proxy URL for PDF:', proxyUrl)
    return proxyUrl
  } catch (error) {
    console.error('Failed to get proxy URL:', error)
    return ''
  }
}

const newKbForm = ref({
  name: '',
  description: '',
})
// 模型配置
const modelConfig = ref({
  llmModelId: '',
  embeddingModelId: '',
})

const parsingConfig = ref({
  enablePdf: true,
  engine: 'markitdown',
  doclingUrl: '',
  pandoc: true,
  academic: false,
  highRes: false,
  fileSizeLimit: '5242880',
})

// Storage 配置
const storageConfig = ref({
  type: 'local',
  endpoint: '',
  accessKeyId: '',
  secretAccessKey: '',
  bucket: '',
})

const openCreateDialog = () => {
  createStep.value = 1
  newKbForm.value = { name: '', description: '' }
  modelConfig.value = { llmModelId: '', embeddingModelId: '' }
  parsingConfig.value = {
    enablePdf: true,
    engine: 'markitdown',
    doclingUrl: '',
    pandoc: true,
    academic: false,
    highRes: false,
    fileSizeLimit: '5242880',
  }
  storageConfig.value = { type: 'local' }
  showCreateDialog.value = true
}

const cancelCreate = () => {
  newKbForm.value = { name: '', description: '' }
  modelConfig.value = { llmModelId: '', embeddingModelId: '' }
  parsingConfig.value = {
    enablePdf: true,
    engine: 'markitdown',
    doclingUrl: '',
    pandoc: true,
    academic: false,
    highRes: false,
    fileSizeLimit: '5242880',
  }
  storageConfig.value = { type: 'local' }
  showCreateDialog.value = false
}

const createKnowledgeBase = async () => {
  const result = await apiCreateKnowledgeBase({
    name: newKbForm.value.name,
    description: newKbForm.value.description,
    llm_model_id: modelConfig.value.llmModelId,
    embedding_model_id: modelConfig.value.embeddingModelId,
    parsing_config: {
      engine: parsingConfig.value.engine,
      docling_url: parsingConfig.value.engine === 'docling' ? parsingConfig.value.doclingUrl : undefined,
      enable_pdf: parsingConfig.value.enablePdf,
      pandoc: parsingConfig.value.pandoc,
    },
    storage_config: {
      type: storageConfig.value.type,
      endpoint: storageConfig.value.type === 'minio' ? storageConfig.value.endpoint : undefined,
      access_key_id: storageConfig.value.type === 'minio' ? storageConfig.value.accessKeyId : undefined,
      secret_access_key: storageConfig.value.type === 'minio' ? storageConfig.value.secretAccessKey : undefined,
      bucket: storageConfig.value.type === 'minio' ? storageConfig.value.bucket : undefined,
    }
  })

  if (result.success) {
    await fetchKbList()
    newKbForm.value = { name: '', description: '' }
    modelConfig.value = { llmModelId: '', embeddingModelId: '' }
    parsingConfig.value = {
      enablePdf: true,
      engine: 'markitdown',
      doclingUrl: '',
      pandoc: true,
      academic: false,
      highRes: false,
      fileSizeLimit: '5242880',
    }
    showCreateDialog.value = false
    ElMessage.success('Knowledge base created successfully')
  } else {
    ElMessage.error(result.message || 'Failed to create knowledge base')
  }
}

// 编辑知识库
const showEditDialog = ref(false)
const editForm = ref({
  id: '',
  name: '',
  description: '',
})

const openEdit = (kb: any) => {
  editForm.value = {
    id: kb.id,
    name: kb.name,
    description: kb.description
  }
  showEditDialog.value = true
}

const saveEdit = () => {
  const kb = knowledgeBases.value.find(k => k.id === editForm.value.id)
  if (kb) {
    kb.name = editForm.value.name
    kb.description = editForm.value.description
  }
  showEditDialog.value = false
  ElMessage.success('Knowledge base updated successfully')
}

const cancelEdit = () => {
  showEditDialog.value = false
}

// 删除知识库
const deleteKb = async (id: string) => {
  const result = await apiDeleteKnowledgeBase(id)
  if (result.success) {
    await fetchKbList()
    ElMessage.success('Knowledge base deleted')
  } else {
    ElMessage.error(result.message || 'Failed to delete knowledge base')
  }
}

// 辅助函数：格式化文件大小
const formatFileSize = (bytes: number) => {
  if (!bytes) return '0 B'
  const k = 1024
  const sizes = ['B', 'KB', 'MB', 'GB']
  const i = Math.floor(Math.log(bytes) / Math.log(k))
  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i]
}

// 辅助函数：格式化日期
const formatDate = (dateStr: string) => {
  if (!dateStr) return ''
  const date = new Date(dateStr)
  return date.toLocaleDateString('zh-CN')
}

// 辅助函数：获取状态图标
const getStatusIcon = (status: string) => {
  switch (status) {
    case 'parsed':
      return 'fa-solid fa-check-circle'
    case 'parsing':
      return 'fa-solid fa-spinner fa-spin'
    case 'failed':
      return 'fa-solid fa-circle-xmark'
    default:
      return 'fa-solid fa-clock'
  }
}

// 进入知识库（上传文档界面）
const enterKnowledge = async (kb: any) => {
  selectedKnowledge.value = kb
  selectedFile.value = null
  previewUrl.value = ''
  previewDownloadUrl.value = ''

  // 获取文档列表
  loadingDocuments.value = true
  try {
    const docs = await fetchKnowledgeDocuments(kb.id, fileFilter.value)
    knowledgeDocuments.value = docs

    // 自动选中第一个文档
    if (docs && docs.length > 0) {
      await selectDocument(docs[0])
    }
  } finally {
    loadingDocuments.value = false
  }

  showFileUploadDialog.value = true
}

// 切换文件过滤标签时重新获取文档列表
const changeFileFilter = async (filter: string) => {
  fileFilter.value = filter
  if (selectedKnowledge.value) {
    loadingDocuments.value = true
    try {
      const docs = await fetchKnowledgeDocuments(selectedKnowledge.value.id, filter)
      knowledgeDocuments.value = docs
    } finally {
      loadingDocuments.value = false
    }
  }
}

// 选择文档
const selectDocument = async (doc: any) => {
  selectedFile.value = doc.id
  selectedDocument.value = doc
  previewUrl.value = ''
  previewDownloadUrl.value = ''
  previewPage.value = 1
  previewTotalPages.value = 1

  // 优先使用代理接口加载PDF
  if (doc.file_key && selectedKnowledge.value) {
    previewUrl.value = await loadPdfWithProxy(doc)
    if (previewUrl.value) {
      return
    }
  }

  // 如果代理失败，尝试使用file_url
  const fileUrl = doc.file_url || doc.fileUrl || doc.url || doc.FileURL
  if (fileUrl) {
    previewUrl.value = fileUrl
    return
  }

  // 如果没有file_url，调用预览API获取
  if (selectedKnowledge.value) {
    loadingPreview.value = true
    try {
      const { getDocumentPreview } = await import('./knowledge/useKnowledge')
      const result = await getDocumentPreview(selectedKnowledge.value.id, doc.id)
      if (result.success && result.data?.content) {
        previewUrl.value = result.data.content
        previewTotalPages.value = result.data.total_pages || 1
        previewPage.value = result.data.current_page || 1
      }
    } catch (error) {
      console.error('Failed to get preview:', error)
    } finally {
      loadingPreview.value = false
    }
  }
}

// 翻页
const changePreviewPage = async (page: number) => {
  if (!selectedKnowledge.value || !selectedFile.value || page < 1 || page > previewTotalPages.value) return

  loadingPreview.value = true
  previewPage.value = page
  try {
    const { getDocumentPreview } = await import('./knowledge/useKnowledge')
    const result = await getDocumentPreview(selectedKnowledge.value.id, selectedFile.value, page)
    if (result.success && result.data?.content) {
      previewUrl.value = result.data.content
      previewTotalPages.value = result.data.total_pages || 1
      previewPage.value = result.data.current_page || page
    }
  } catch (error) {
    console.error('Failed to get preview:', error)
  } finally {
    loadingPreview.value = false
  }
}

// 触发文件上传
const triggerFileUpload = () => {
  fileInput.value?.click()
}

// 处理文件选择
const handleFileSelect = async (event: Event) => {
  const target = event.target as HTMLInputElement
  const file = target.files?.[0]
  if (!file || !selectedKnowledge.value) return

  uploading.value = true
  try {
    const { uploadDocument } = await import('./knowledge/useKnowledge')
    const result = await uploadDocument(selectedKnowledge.value.id, file)

    if (result.success) {
      ElMessage.success('File uploaded successfully')

      // 刷新文档列表以获取最新数据（包括 file_key）
      await changeFileFilter(fileFilter.value)

      // 获取刚上传的文档
      const uploadedDoc = knowledgeDocuments.value.find(d => d.id === result.id)
      if (uploadedDoc) {
        // 选中新上传的文档
        selectedFile.value = result.id
        selectedDocument.value = uploadedDoc

        // 使用代理接口加载PDF
        if (uploadedDoc.file_key) {
          previewUrl.value = await loadPdfWithProxy(uploadedDoc)
        } else if (uploadedDoc.file_url) {
          previewUrl.value = uploadedDoc.file_url
        }
      }
    } else {
      ElMessage.error(result.message || 'Failed to upload file')
    }
  } catch (error) {
    ElMessage.error('Failed to upload file')
  } finally {
    uploading.value = false
    // 清空 input 以便可以再次选择相同文件
    target.value = ''
  }
}

// 删除文档
const deleteDocument = async (docId: string) => {
  if (!selectedKnowledge.value) return

  try {
    const { deleteDocument: apiDeleteDocument } = await import('./knowledge/useKnowledge')
    const result = await apiDeleteDocument(selectedKnowledge.value.id, docId)

    if (result.success) {
      ElMessage.success('Document deleted')
      // 如果删除的是当前选中的文件，清除选中状态
      if (selectedFile.value === docId) {
        selectedFile.value = null
        selectedDocument.value = null
        previewUrl.value = ''
  previewDownloadUrl.value = ''
      }
      // 刷新文档列表
      await changeFileFilter(fileFilter.value)
    } else {
      ElMessage.error(result.message || 'Failed to delete document')
    }
  } catch (error) {
    ElMessage.error('Failed to delete document')
  }
}
</script>

<template>
  <div class="p-6 min-h-screen">
    <!-- 顶部导航 -->
    <div class="flex justify-between items-center mb-6">
      <div class="flex items-center gap-2">
        <i class="fa-solid fa-brain text-gray-400"></i>
        <span class="font-medium">Knowledge Base</span>
      </div>
      <button @click="openCreateDialog" class="btn-primary">
        <i class="fa-solid fa-plus"></i>
        New Knowledge Base
      </button>
    </div>

    <!-- 搜索 -->
    <div class="flex gap-4 mb-6">
      <div class="flex-1 relative">
        <i class="fa-solid fa-search absolute left-3 top-1/2 -translate-y-1/2 text-gray-400"></i>
        <input
          v-model="searchQuery"
          type="text"
          placeholder="Search knowledge bases by name or description..."
          class="search-input w-full"
        >
      </div>
    </div>

    <!-- Knowledge Base 列表 -->
    <div class="bg-dark-700 rounded-xl overflow-hidden">
      <div v-if="loading" class="py-12 text-center text-gray-400">
        <i class="fa-solid fa-circle-notch fa-spin text-2xl mb-2"></i>
        <p>Loading...</p>
      </div>
      <table v-else-if="filteredKnowledgeBases().length > 0" class="w-full">
        <thead class="bg-dark-600">
          <tr>
            <th class="text-left px-5 py-3 text-sm font-medium text-gray-400">Name</th>
            <th class="text-center px-5 py-3 text-sm font-medium text-gray-400">Documents</th>
            <th class="text-center px-5 py-3 text-sm font-medium text-gray-400">Chunks</th>
            <th class="text-center px-5 py-3 text-sm font-medium text-gray-400">Status</th>
            <th class="text-center px-5 py-3 text-sm font-medium text-gray-400">Created</th>
            <th class="text-center px-5 py-3 text-sm font-medium text-gray-400">Actions</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="kb in filteredKnowledgeBases()" :key="kb.id" class="table-row">
            <td class="px-5 py-4">
              <div class="font-medium">{{ kb.name }}</div>
              <div class="text-sm text-gray-500">{{ kb.description }}</div>
            </td>
            <td class="px-5 py-4 text-center">
              <span class="text-primary-cyan">{{ kb.document_count }}</span>
            </td>
            <td class="px-5 py-4 text-center text-gray-400 text-sm">
              {{ kb.chunk_count }}
            </td>
            <td class="px-5 py-4 text-center">
              <span v-if="kb.status === 'ready'" class="bg-primary-success/20 text-primary-success px-2 py-1 rounded text-sm">
                Ready
              </span>
              <span v-else-if="kb.status === 'processing'" class="bg-primary-warning/20 text-primary-warning px-2 py-1 rounded text-sm">
                Processing
              </span>
            </td>
            <td class="px-5 py-4 text-center text-gray-400 text-sm">
              {{ kb.created_at?.split('T')[0] }}
            </td>
            <td class="px-5 py-4">
              <div class="flex items-center justify-center gap-2">
                <button
                  @click="enterKnowledge(kb)"
                  class="p-2 rounded-lg transition-colors hover:bg-dark-600"
                  title="Enter"
                >
                  <i class="fa-solid fa-door-open text-gray-400 hover:text-primary-orange"></i>
                </button>
                <button
                  @click="openEdit(kb)"
                  class="p-2 rounded-lg transition-colors hover:bg-dark-600"
                  title="Edit"
                >
                  <i class="fa-solid fa-pen text-gray-400 hover:text-primary-danger"></i>
                </button>
                <button
                  @click="deleteKb(kb.id)"
                  class="p-2 rounded-lg transition-colors hover:bg-dark-600"
                  title="Delete"
                >
                  <i class="fa-solid fa-trash text-gray-400 hover:text-primary-danger"></i>
                </button>
              </div>
            </td>
          </tr>
        </tbody>
      </table>

      <!-- 空状态 -->
      <div v-else class="empty-box">
        <div class="empty-icon">
          <i class="fa-solid fa-brain"></i>
        </div>
        <p class="empty-text">No knowledge bases found</p>
        <p class="empty-tip">Click "New Knowledge Base" to create one</p>
      </div>
    </div>

    <!-- 新建知识库弹窗 -->
    <el-dialog
      v-model="showCreateDialog"
      title="Create Knowledge Base"
      width="1100px"
      :close-on-click-modal="false"
      :show-close="false"
      class="kb-dialog kb-create-dialog"
    >
      <div class="create-layout">
        <!-- 左侧：选项列表 -->
        <div class="sidebar">
          <div
            class="menu-item"
            :class="{ active: createStep === 1 }"
            @click="createStep = 1"
          >
            <i class="fa-solid fa-layer-group menu-icon"></i>
            <div class="menu-content">
              <span class="menu-title">Basic Info</span>
              <span class="menu-desc">Name and description</span>
            </div>
            <i v-if="createStep === 1" class="fa-solid fa-chevron-right menu-arrow"></i>
            <i v-else-if="createStep > 1 && step1Valid" class="fa-solid fa-check-circle menu-check"></i>
          </div>
          <div
            class="menu-item"
            :class="{ active: createStep === 2, disabled: !canClickStep(2) }"
            @click="canClickStep(2) && (createStep = 2)"
          >
            <i class="fa-solid fa-robot menu-icon"></i>
            <div class="menu-content">
              <span class="menu-title">Model Config</span>
              <span class="menu-desc">Embedding & rerank models</span>
            </div>
            <i v-if="createStep === 2" class="fa-solid fa-chevron-right menu-arrow"></i>
            <i v-else-if="createStep > 2 && step2Valid" class="fa-solid fa-check-circle menu-check"></i>
          </div>
          <div
            class="menu-item"
            :class="{ active: createStep === 3, disabled: !canClickStep(3) }"
            @click="canClickStep(3) && (createStep = 3)"
          >
            <i class="fa-solid fa-file-lines menu-icon"></i>
            <div class="menu-content">
              <span class="menu-title">Parsing</span>
              <span class="menu-desc">Document parsing settings</span>
            </div>
            <i v-if="createStep === 3" class="fa-solid fa-chevron-right menu-arrow"></i>
            <i v-else-if="createStep > 3 && step3Valid" class="fa-solid fa-check-circle menu-check"></i>
          </div>
          <div
            class="menu-item"
            :class="{ active: createStep === 4, disabled: !canClickStep(4) }"
            @click="canClickStep(4) && (createStep = 4)"
          >
            <i class="fa-solid fa-hard-drive menu-icon"></i>
            <div class="menu-content">
              <span class="menu-title">Storage</span>
              <span class="menu-desc">Vector & file storage</span>
            </div>
            <i v-if="createStep === 4" class="fa-solid fa-chevron-right menu-arrow"></i>
            <i v-else-if="createStep > 4 && step4Valid" class="fa-solid fa-check-circle menu-check"></i>
          </div>
        </div>

        <!-- 右侧：内容区 -->
        <div class="content">
          <!-- Step 1: Basic Info -->
          <div v-if="createStep === 1" class="form-content">
            <div class="section-header">
              <i class="fa-solid fa-layer-group section-icon"></i>
              <span class="section-title">Basic Info</span>
            </div>
            <el-form label-position="top" class="kb-form">
              <el-form-item label="Name" required>
                <el-input v-model="newKbForm.name" placeholder="Enter knowledge base name" />
              </el-form-item>
              <el-form-item label="Description">
                <el-input v-model="newKbForm.description" type="textarea" :rows="4" placeholder="Enter knowledge base description" />
              </el-form-item>
            </el-form>
          </div>

          <!-- Step 2: Model Config -->
          <div v-if="createStep === 2" class="form-content">
            <div class="section-header">
              <i class="fa-solid fa-robot section-icon"></i>
              <span class="section-title">Model Config</span>
            </div>
            <el-form label-position="top" class="kb-form">
              <el-form-item label="LLM Model">
                <el-select v-model="modelConfig.llmModelId" placeholder="Select a chat model" class="w-full" popper-class="dark-select-dropdown">
                  <el-option
                    v-for="model in llmModels"
                    :key="model.id"
                    :label="model.name"
                    :value="model.id"
                  >
                    <div class="model-option">
                      <span class="model-name">{{ model.name }}</span>
                      <span class="model-info">{{ model.provider }} - {{ model.model }}</span>
                    </div>
                  </el-option>
                </el-select>
              </el-form-item>
              <el-form-item label="Embedding Model">
                <el-select v-model="modelConfig.embeddingModelId" placeholder="Select an embedding model" class="w-full" popper-class="dark-select-dropdown">
                  <el-option
                    v-for="model in embeddingModels"
                    :key="model.id"
                    :label="model.name"
                    :value="model.id"
                  >
                    <div class="model-option">
                      <span class="model-name">{{ model.name }}</span>
                      <span class="model-info">{{ model.provider }} - {{ model.model }}</span>
                    </div>
                  </el-option>
                </el-select>
              </el-form-item>
            </el-form>
          </div>

          <!-- Step 3: Parsing -->
          <div v-if="createStep === 3" class="form-content">
            <div class="section-header">
              <i class="fa-solid fa-file-lines section-icon"></i>
              <span class="section-title">Parsing</span>
            </div>

            <div class="parsing-section">
              <div class="parsing-row">
                <span class="parsing-label">Parsing Engine</span>
                <el-select v-model="parsingConfig.engine" placeholder="Select engine" class="parsing-select" popper-class="dark-select-dropdown">
                  <el-option label="MarkItDown" value="markitdown" />
                  <el-option label="Docling" value="docling" />
                </el-select>
              </div>

              <!-- Docling URL 配置 -->
              <div v-if="parsingConfig.engine === 'docling'" class="parsing-row" style="margin-top: 12px; align-items: center;">
                <span class="parsing-label" style="flex: 1;">Docling URL</span>
                <input
                  v-model="parsingConfig.doclingUrl"
                  type="text"
                  placeholder="http://localhost:8080"
                  class="input-field"
                  style="width: 350px;"
                >
              </div>
            </div>
          </div>

          <!-- Step 4: Storage -->
          <div v-if="createStep === 4" class="form-content">
            <div class="section-header">
              <i class="fa-solid fa-hard-drive section-icon"></i>
              <span class="section-title">Storage</span>
            </div>
            <el-form label-position="top" class="kb-form">
              <el-form-item label="Storage Type">
                <el-select v-model="storageConfig.type" placeholder="Select storage type" class="w-full" popper-class="dark-select-dropdown">
                  <el-option label="Local" value="local" />
                  <el-option label="MinIO" value="minio" />
                  <el-option label="S3" value="s3" />
                </el-select>
              </el-form-item>

              <!-- MinIO 配置 -->
              <template v-if="storageConfig.type === 'minio'">
                <el-form-item label="Endpoint">
                  <el-input v-model="storageConfig.endpoint" placeholder="http://localhost:9000" />
                </el-form-item>
                <el-form-item label="Access Key ID">
                  <el-input v-model="storageConfig.accessKeyId" placeholder="Enter Access Key ID" />
                </el-form-item>
                <el-form-item label="Secret Access Key">
                  <el-input v-model="storageConfig.secretAccessKey" type="password" placeholder="Enter Secret Access Key" show-password />
                </el-form-item>
                <el-form-item label="Bucket">
                  <el-input v-model="storageConfig.bucket" placeholder="Enter Bucket name" />
                </el-form-item>
              </template>
            </el-form>
          </div>
        </div>
      </div>

      <template #footer>
        <div class="dialog-footer">
          <div class="footer-left">
            <span class="step-hint">Step {{ createStep }} of 4</span>
          </div>
          <div class="footer-right">
            <el-button @click="cancelCreate" class="cancel-btn">Cancel</el-button>
            <el-button v-if="createStep > 1" @click="prevStep" class="prev-btn">
              <i class="fa-solid fa-arrow-left"></i>
              Previous
            </el-button>
            <el-button v-if="createStep < 4" :disabled="!isCurrentStepValid" @click="nextStep" class="next-btn">
              Next
              <i class="fa-solid fa-arrow-right"></i>
            </el-button>
            <el-button v-if="createStep === 4" :disabled="!isCurrentStepValid" @click="createKnowledgeBase" class="confirm-btn">
              <i class="fa-solid fa-plus"></i>
              Create
            </el-button>
          </div>
        </div>
      </template>
    </el-dialog>

    <!-- 编辑知识库弹窗 -->
    <el-dialog
      v-model="showEditDialog"
      title="Edit Knowledge Base"
      width="500px"
      :close-on-click-modal="false"
      class="kb-dialog"
    >
      <p class="dialog-desc">Edit knowledge base information</p>

      <el-form label-position="top" class="kb-form">
        <el-form-item label="Name">
          <el-input v-model="editForm.name" placeholder="Enter knowledge base name" />
        </el-form-item>
        <el-form-item label="Description">
          <el-input v-model="editForm.description" type="textarea" :rows="3" placeholder="Enter description" />
        </el-form-item>
      </el-form>

      <template #footer>
        <div class="dialog-footer">
          <el-button text @click="cancelEdit">Cancel</el-button>
          <el-button type="primary" @click="saveEdit">Save</el-button>
        </div>
      </template>
    </el-dialog>

    <!-- 文件上传弹窗 -->
    <el-dialog
      v-model="showFileUploadDialog"
      title=" "
      width="calc(100vw - 40px)"
      top="20px"
      :close-on-click-modal="false"
      class="kb-dialog file-upload-dialog"
    >
      <div class="file-upload-layout">
        <!-- 顶部导航 -->
        <div class="file-header">
          <button class="back-btn" @click="showFileUploadDialog = false">
            <i class="fa-solid fa-arrow-left"></i>
          </button>
          <h2 class="file-title">{{ selectedKnowledge?.name || 'Knowledge Base' }}</h2>
          <input
            type="file"
            ref="fileInput"
            style="display: none"
            accept=".pdf,.doc,.docx,.txt,.md"
            @change="handleFileSelect"
          />
          <button class="btn-primary" @click="triggerFileUpload">
            <i class="fa-solid fa-upload"></i>
            Upload
          </button>
        </div>

        <!-- 标签栏 -->
        <div class="file-tabs">
          <div
            class="file-tab"
            :class="{ active: fileFilter === 'all' }"
            @click="changeFileFilter('all')"
          >
            All
          </div>
          <div
            class="file-tab"
            :class="{ active: fileFilter === 'parsed' }"
            @click="changeFileFilter('parsed')"
          >
            Parsed
          </div>
          <div
            class="file-tab"
            :class="{ active: fileFilter === 'parsing' }"
            @click="changeFileFilter('parsing')"
          >
            Parsing
          </div>
          <div
            class="file-tab"
            :class="{ active: fileFilter === 'failed' }"
            @click="changeFileFilter('failed')"
          >
            Failed
          </div>
        </div>

        <!-- 内容区 - 左侧文件列表 + 右侧预览 -->
        <div class="file-main">
          <!-- 左侧文件列表 -->
          <div class="file-list">
            <!-- 加载状态 -->
            <div v-if="loadingDocuments" class="loading-state">
              <i class="fa-solid fa-spinner fa-spin"></i>
              <span>Loading...</span>
            </div>
            <!-- 无数据提示 -->
            <div v-else-if="knowledgeDocuments.length === 0" class="empty-state">
              <i class="fa-solid fa-folder-open"></i>
              <span>No documents yet</span>
            </div>
            <!-- 文档列表 -->
            <div
              v-else
              class="file-item"
              :class="{ selected: selectedFile === doc.id }"
              v-for="doc in knowledgeDocuments"
              :key="doc.id"
              @click="selectDocument(doc)"
            >
              <div class="file-item-icon">
                <i class="fa-solid fa-file-pdf"></i>
              </div>
              <div class="file-item-info">
                <div class="file-item-name">{{ doc.name }}</div>
                <div class="file-item-meta">
                  <span>{{ formatFileSize(doc.file_size) }}</span>
                  <span>{{ formatDate(doc.uploaded_at) }}</span>
                </div>
              </div>
              <div class="file-item-status" :class="doc.status">
                <span v-if="doc.status === 'failed'" class="status-text">Failed</span>
                <i v-else :class="getStatusIcon(doc.status)"></i>
              </div>
            </div>
          </div>

          <!-- 右侧预览面板 -->
          <div class="file-preview">
            <!-- 无选中文件时显示提示 -->
            <div v-if="!selectedFile" class="preview-empty">
              <i class="fa-solid fa-file-lines"></i>
              <span>Select a document to preview</span>
            </div>
            <!-- 有选中文件时显示预览 -->
            <template v-else>
            <div class="preview-header">
              <div class="preview-header-left">
                <i class="fa-solid fa-file-pdf"></i>
                <span class="preview-filename">{{ selectedDocument?.name || 'Document' }}</span>
              </div>
              <div class="preview-header-info">
                <span class="info-tag">{{ formatFileSize(selectedDocument?.file_size) }}</span>
                <span class="info-tag">{{ formatDate(selectedDocument?.uploaded_at) }}</span>
                <span class="info-tag" :class="selectedDocument?.status">{{ selectedDocument?.status === 'parsed' ? 'Parsed' : selectedDocument?.status === 'parsing' ? 'Parsing' : selectedDocument?.status === 'failed' ? 'Failed' : 'Pending' }}</span>
                <span class="info-tag">{{ selectedDocument?.chunk_count || 0 }} chunks</span>
              </div>
            </div>
            <div class="preview-content">
              <!-- PDF文件预览 -->
              <div class="pdf-preview">
                <!-- 加载中状态 -->
                <div v-if="loadingPreview" class="preview-loading">
                  <i class="fa-solid fa-spinner fa-spin"></i>
                  <span>Loading preview...</span>
                </div>
                <!-- 有blob预览URL时显示PDF (使用iframe) -->
                <iframe
                  v-else-if="previewUrl"
                  :src="previewUrl"
                  class="pdf-embed"
                />
                <!-- 无预览但有下载链接时显示下载按钮 -->
                <div v-else-if="previewDownloadUrl" class="preview-no-file">
                  <i class="fa-solid fa-file-pdf"></i>
                  <span>Cannot preview PDF directly</span>
                  <a :href="previewDownloadUrl" target="_blank" class="download-link">
                    <i class="fa-solid fa-download"></i> Download PDF
                  </a>
                </div>
                <!-- 无预览也无下载链接时显示提示 -->
                <div v-else class="preview-no-file">
                  <i class="fa-solid fa-file-pdf"></i>
                  <span>Document preview not available</span>
                </div>
              </div>
            </div>
            </template>
            <div class="preview-actions">
              <button class="action-btn delete" @click="deleteDocument(selectedFile)">
                <i class="fa-solid fa-trash"></i>
                Delete
              </button>
              <button class="action-btn reparse">
                <i class="fa-solid fa-rotate"></i>
                Reparse
              </button>
              <button class="action-btn confirm">
                <i class="fa-solid fa-check"></i>
                Confirm
              </button>
            </div>
          </div>
        </div>
      </div>
    </el-dialog>
  </div>
</template>
