feat: 更新Chat前端页面

- 优化Chat组件交互体验
- 修复智能体选择逻辑
- 新增chat页面样式和脚本

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/components/chat/ChatAgentSelector.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
-import type { Agent } from '@/composables/useChat'
+import type { Agent } from '@/views/chat/chat'
 
-defineProps<{
+const props = defineProps<{
   show: boolean
   selectMode: 'single' | 'group'
   chatAgents: Agent[]
@@ -15,6 +15,11 @@ const emit = defineEmits<{
   (e: 'confirm'): void
   (e: 'update:groupChatName', value: string): void
 }>()
+
+// 点击智能体 - 只是选择，不直接确认
+const handleAgentClick = (agent: Agent) => {
+  emit('toggleSelect', agent)
+}
 </script>
 
 <template>
@@ -47,7 +52,7 @@ const emit = defineEmits<{
               <button
                 v-for="agent in chatAgents"
                 :key="agent.id"
-                @click="emit('toggleSelect', agent)"
+                @click="handleAgentClick(agent)"
                 class="w-full flex items-center gap-3 px-3 py-2.5 rounded-lg transition-all duration-200"
                 :class="selectedAgents.some(a => a.id === agent.id)
                   ? 'bg-orange-500/20 border border-orange-500/50'
@@ -82,7 +87,15 @@ const emit = defineEmits<{
               Cancel
             </button>
             <button
-              v-if="selectMode === 'group'"
+              v-if="selectMode === 'single'"
+              @click="emit('confirm')"
+              :disabled="selectedAgents.length === 0"
+              class="flex-1 py-2.5 bg-orange-500 hover:bg-orange-400 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              Confirm
+            </button>
+            <button
+              v-else
               @click="emit('confirm')"
               :disabled="selectedAgents.length < 2"
               class="flex-1 py-2.5 bg-orange-500 hover:bg-orange-400 text-white rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed"

web/src/components/chat/ChatHeader.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { getModelIcon, type Agent, type ChatModel } from '@/composables/useChat'
+import { getModelIcon, type Agent, type ChatModel } from '@/views/chat/chat'
 
 defineProps<{
   selectedAgent: Agent | null
@@ -13,6 +13,8 @@ const emit = defineEmits<{
   (e: 'toggleDropdown'): void
   (e: 'selectModel', model: ChatModel): void
   (e: 'toggleSidebar'): void
+  (e: 'clearChat'): void
+  (e: 'newChat'): void
 }>()
 </script>
 
@@ -40,8 +42,30 @@ const emit = defineEmits<{
     <!-- 中间：空白 -->
     <div class="flex-1"></div>
 
-    <!-- 右侧：模型选择和折叠按钮 -->
+    <!-- 右侧：模型选择和操作按钮 -->
-    <div class="flex items-center gap-3">
+    <div class="flex items-center gap-2">
+      <!-- 新建对话按钮 -->
+      <button
+        @click="emit('newChat')"
+        class="p-2 rounded-lg hover:bg-white/[0.06] text-white/35 hover:text-white/80 transition-all duration-200"
+        title="新建对话"
+      >
+        <svg class="w-[18px] h-[18px]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M12 4v16m8-8H4"></path>
+        </svg>
+      </button>
+
+      <!-- 清空对话按钮 -->
+      <button
+        @click="emit('clearChat')"
+        class="p-2 rounded-lg hover:bg-white/[0.06] text-white/35 hover:text-white/80 transition-all duration-200"
+        title="清空对话"
+      >
+        <svg class="w-[18px] h-[18px]" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M19 7l-.867 12.142A2 2 0 0116.138 21H7.862a2 2 0 01-1.995-1.858L5 7m5 4v6m4-6v6m1-10V4a1 1 0 00-1-1h-4a1 1 0 00-1 1v3M4 7h16"></path>
+        </svg>
+      </button>
+
       <!-- 模型选择下拉框 -->
       <div class="relative model-dropdown" v-if="chatModels.length > 0">
         <button
@@ -52,7 +76,10 @@ const emit = defineEmits<{
             <span class="text-base">{{ getModelIcon(selectedModel?.provider || '') }}</span>
             <span class="text-sm text-white">{{ selectedModel?.name || 'Select Model' }}</span>
           </div>
-          <span class="w-1.5 h-1.5 rounded-full bg-emerald-400"></span>
+          <span
+            class="w-1.5 h-1.5 rounded-full"
+            :class="selectedModel?.status === 1 ? 'bg-emerald-400' : 'bg-gray-400'"
+          ></span>
           <svg class="w-3.5 h-3.5 text-white/40" fill="none" stroke="currentColor" viewBox="0 0 24 24">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"></path>
           </svg>
@@ -80,7 +107,10 @@ const emit = defineEmits<{
                   <div class="text-sm text-white">{{ model.name }}</div>
                   <div class="text-xs text-white/40">{{ model.provider }} · {{ model.model }}</div>
                 </div>
-                <span class="w-2 h-2 rounded-full bg-emerald-400"></span>
+                <span
+                  class="w-2 h-2 rounded-full"
+                  :class="model.status === 1 ? 'bg-emerald-400' : 'bg-gray-400'"
+                ></span>
               </button>
             </div>
           </div>

web/src/components/chat/ChatInput.vue

@@ -41,7 +41,7 @@ const autoResize = (e: Event) => {
           @keydown="handleKeydown"
           placeholder="发送消息..."
           rows="1"
-          class="w-full bg-transparent text-white placeholder-white/25 py-4 pl-12 pr-28 resize-none focus:outline-none text-[15px]"
+          class="chat-input-textarea w-full bg-transparent text-white placeholder-white/25 py-4 pl-12 pr-28 resize-none focus:outline-none text-[15px]"
         ></textarea>
 
         <!-- 发送按钮 -->
@@ -63,9 +63,10 @@ const autoResize = (e: Event) => {
         </button>
       </div>
 
-      <!-- 提示 -->
+      <!-- 字符计数 -->
-      <div class="text-center mt-3">
+      <div class="flex justify-between items-center mt-2 px-1">
         <span class="text-[10px] text-white/20 tracking-wide">AI 可能会产生错误信息，请核实重要内容</span>
+        <span class="text-[10px] text-white/20">{{ modelValue.length }}/4000</span>
       </div>
     </div>
   </div>

web/src/components/chat/ChatMessage.vue

@@ -1,16 +1,33 @@
 <script setup lang="ts">
-import { renderMarkdown, type ChatMessage, type Agent } from '@/composables/useChat'
+import { ref } from 'vue'
+import { renderMarkdown, type ChatMessage, type Agent } from '@/views/chat/chat'
 
-defineProps<{
+const props = defineProps<{
   message: ChatMessage
   selectedAgent: Agent | null
 }>()
 
+const showActions = ref(false)
+const copySuccess = ref(false)
+
 // 创建消息内容的函数
 const getMessageContent = (content: string, isUser: boolean) => {
   if (isUser) return content
   return renderMarkdown(content)
 }
+
+// 复制消息
+const copyMessage = async () => {
+  try {
+    await navigator.clipboard.writeText(props.message.content)
+    copySuccess.value = true
+    setTimeout(() => {
+      copySuccess.value = false
+    }, 2000)
+  } catch (err) {
+    console.error('Failed to copy:', err)
+  }
+}
 </script>
 
 <template>
@@ -32,16 +49,38 @@ const getMessageContent = (content: string, isUser: boolean) => {
     </div>
 
     <!-- 消息容器 -->
-    <div class="flex flex-col max-w-[70%]" :class="message.role === 'user' ? 'items-end' : 'items-start'">
+    <div
+      class="flex flex-col max-w-[70%] group"
+      :class="message.role === 'user' ? 'items-end' : 'items-start'"
+      @mouseenter="showActions = true"
+      @mouseleave="showActions = false"
+    >
       <!-- 消息气泡 -->
       <div
-        class="px-4 py-3 rounded-2xl text-[14px] leading-relaxed markdown-body"
+        class="px-4 py-3 rounded-2xl text-[14px] leading-relaxed markdown-body relative"
         :class="message.role === 'user'
           ? 'bg-gradient-to-br from-orange-500 to-orange-600 text-white rounded-br-sm'
           : 'bg-[#1e1e28] text-gray-100 rounded-bl-sm'"
       >
         <span v-html="getMessageContent(message.content, message.role === 'user')"></span>
         <span v-if="message.isStreaming" class="inline-block w-0.5 h-4 ml-0.5 bg-orange-300 cursor-blink align-middle"></span>
+
+        <!-- 复制按钮 -->
+        <Transition name="fade">
+          <button
+            v-if="showActions && message.content"
+            @click="copyMessage"
+            class="absolute -top-2 right-2 p-1.5 rounded-lg bg-[#2a2a35] hover:bg-[#3a3a45] text-white/60 hover:text-white transition-all duration-150 shadow-lg"
+            :title="copySuccess ? '已复制' : '复制'"
+          >
+            <svg v-if="!copySuccess" class="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
+            </svg>
+            <svg v-else class="w-3.5 h-3.5 text-emerald-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
+            </svg>
+          </button>
+        </Transition>
       </div>
       <!-- 时间戳 -->
       <span class="text-[11px] text-gray-500 mt-1 px-1">
@@ -132,4 +171,14 @@ const getMessageContent = (content: string, isUser: boolean) => {
 .markdown-body :deep(th) {
   background: rgba(0, 0, 0, 0.2);
 }
+
+.fade-enter-active,
+.fade-leave-active {
+  transition: opacity 0.15s ease;
+}
+
+.fade-enter-from,
+.fade-leave-to {
+  opacity: 0;
+}
 </style>

web/src/components/chat/ChatSidebar.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import type { Agent, ChatSession, GroupChat } from '@/composables/useChat'
+import type { Agent, ChatSession, GroupChat } from '@/views/chat/chat'
 
 defineProps<{
   collapsed: boolean
@@ -13,6 +13,7 @@ const emit = defineEmits<{
   (e: 'openAgentSelector', mode: 'single' | 'group'): void
   (e: 'selectAgent', agent: Agent): void
   (e: 'selectSession', session: ChatSession): void
+  (e: 'selectGroup', group: GroupChat): void
 }>()
 
 const formatRelativeTime = (date: Date) => {
@@ -98,6 +99,7 @@ const formatRelativeTime = (date: Date) => {
           <button
             v-for="group in groupChats"
             :key="group.id"
+            @click="emit('selectGroup', group)"
             class="w-full text-left px-3 py-2.5 rounded-lg hover:bg-white/5 transition-all duration-200 group"
           >
             <div class="flex items-center gap-2">

web/src/views/Chat.vue

@@ -1,11 +1,12 @@
 <script setup lang="ts">
 import { ref, nextTick, onMounted, onUnmounted } from 'vue'
-import { useChat } from '@/composables/useChat'
+import { useChat } from './chat/chat'
 import ChatHeader from '@/components/chat/ChatHeader.vue'
 import ChatMessage from '@/components/chat/ChatMessage.vue'
 import ChatInput from '@/components/chat/ChatInput.vue'
 import ChatSidebar from '@/components/chat/ChatSidebar.vue'
 import ChatAgentSelector from '@/components/chat/ChatAgentSelector.vue'
+import './chat/chat.css'
 
 const {
   chatModels,
@@ -15,6 +16,7 @@ const {
   selectedAgent,
   messages,
   chatSessions,
+  currentSessionId,
   groupChats,
   showAgentSelector,
   selectMode,
@@ -29,9 +31,16 @@ const {
   confirmAgentSelection,
   cancelAgentSelection,
   selectAgent,
+  selectGroup,
   selectSession,
   newChat,
+  clearMessages,
   toggleSidebar,
+  createSession,
+  saveMessage,
+  deleteSession,
+  init,
+  cleanup,
 } = useChat()
 
 const messagesContainer = ref<HTMLElement | null>(null)
@@ -74,6 +83,19 @@ const sendMessage = async () => {
   const userContent = inputMessage.value.trim()
   inputMessage.value = ''
 
+  // 重置输入框高度
+  nextTick(() => {
+    const textarea = document.querySelector('.chat-input-textarea') as HTMLTextAreaElement
+    if (textarea) {
+      textarea.style.height = 'auto'
+    }
+  })
+
+  // 如果没有会话，创建一个新会话
+  if (!currentSessionId.value) {
+    await createSession()
+  }
+
   const userMessage = {
     id: Date.now(),
     role: 'user' as const,
@@ -82,6 +104,9 @@ const sendMessage = async () => {
   }
   messages.value.push(userMessage)
 
+  // 保存用户消息到后端
+  await saveMessage('user', userContent)
+
   const aiMessage = {
     id: Date.now() + 1,
     role: 'assistant' as const,
@@ -95,23 +120,6 @@ const sendMessage = async () => {
 
   isLoading.value = true
 
-  // ====== MOCK 模式：使用 mock 测试流式效果 ======
-  const USE_MOCK = false
-
-  if (USE_MOCK) {
-    const mockResponses = [
-      "你好！我是你的 AI 助手。",
-      "我收到了你的消息：\"" + userContent + "\"",
-      "这是一个模拟的流式响应效果。",
-      "现在你可以看到文字逐字出现的效果了！"
-    ]
-    const fullResponse = mockResponses.join(' ')
-    const aiMessageIndex = messages.value.length - 1
-    await mockStreamResponse(fullResponse, aiMessageIndex)
-    return
-  }
-  // ====== MOCK 模式结束 ======
-
   try {
     const requestBody: any = {
       agent_id: selectedAgent.value?.id || 1,
@@ -122,7 +130,11 @@ const sendMessage = async () => {
       requestBody.model_id = selectedModel.value.id
     }
 
-    // 先获取完整响应，再逐字符显示（模拟流式效果）
+    // 传入 session_id
+    if (currentSessionId.value) {
+      requestBody.session_id = currentSessionId.value
+    }
+
     const response = await fetch(`/api/agent/chat/stream`, {
       method: 'POST',
       headers: {
@@ -135,11 +147,11 @@ const sendMessage = async () => {
       throw new Error(`Request failed: ${response.status}`)
     }
 
-    // 读取完整响应
+    // 真正的流式处理：边读取边显示
     const reader = response.body.getReader()
     const decoder = new TextDecoder()
     let buffer = ''
-    let fullText = ''
+    const aiMessageIndex = messages.value.length - 1
 
     while (true) {
       const { done, value } = await reader.read()
@@ -152,34 +164,31 @@ const sendMessage = async () => {
 
       for (const line of lines) {
         if (line.startsWith('data: ')) {
-          const data = line.slice(6)
+          const data = line.slice(6).trim()
           if (data && data !== '[DONE]') {
-            fullText += data
+            // 直接累加内容并显示（真正的流式）
-          }
+            messages.value[aiMessageIndex].content += data
-        }
-      }
-    }
-
-    // 逐字符显示（模拟流式），每3个字符更新一次UI，减少重绘
-    const aiMessageIndex = messages.value.length - 1
-    messages.value[aiMessageIndex].content = ''
-    let tempText = ''
-
-    for (let i = 0; i < fullText.length; i++) {
-      tempText += fullText[i]
-      // 每3个字符更新一次UI，减少重绘次数
-      if ((i + 1) % 3 === 0 || i === fullText.length - 1) {
-        messages.value[aiMessageIndex].content = tempText
             await nextTick()
             scrollToBottom()
-        // 添加小延迟，让动画更自然
+          }
-        await new Promise(r => setTimeout(r, 8))
+        }
+      }
+    }
+
+    // 处理剩余buffer中的数据
+    if (buffer.startsWith('data: ')) {
+      const data = buffer.slice(6).trim()
+      if (data && data !== '[DONE]') {
+        messages.value[aiMessageIndex].content += data
       }
     }
 
     messages.value[aiMessageIndex].isStreaming = false
     isLoading.value = false
     scrollToBottom()
+
+    // 保存 AI 消息到后端
+    await saveMessage('assistant', messages.value[aiMessageIndex].content)
   } catch (error: any) {
     console.error('[Stream] 错误:', error)
     const errorIndex = messages.value.findIndex(m => m.isStreaming)
@@ -190,6 +199,16 @@ const sendMessage = async () => {
     isLoading.value = false
   }
 }
+
+// 初始化
+onMounted(() => {
+  console.log('[Chat] Component mounted, calling init()')
+  init()
+})
+
+onUnmounted(() => {
+  cleanup()
+})
 </script>
 
 <template>
@@ -206,11 +225,22 @@ const sendMessage = async () => {
         @toggle-dropdown="toggleModelDropdown"
         @select-model="handleSelectModel"
         @toggle-sidebar="toggleSidebar"
+        @clear-chat="clearMessages"
+        @new-chat="newChat"
       />
 
       <!-- 消息区域 -->
       <div ref="messagesContainer" class="flex-1 overflow-y-auto py-4">
-        <div class="px-6">
+        <!-- 空状态欢迎提示 -->
+        <div v-if="messages.length === 0" class="h-full flex items-center justify-center">
+          <div class="text-center">
+            <div class="text-5xl mb-4">{{ selectedAgent?.avatar || '🧠' }}</div>
+            <h2 class="text-xl font-semibold text-white mb-2">和 {{ selectedAgent?.name || 'AI' }} 开始对话</h2>
+            <p class="text-white/40 text-sm">发送消息开始聊天</p>
+          </div>
+        </div>
+        <!-- 消息列表 -->
+        <div v-else class="px-6">
           <ChatMessage
             v-for="message in messages"
             :key="message.id"
@@ -238,6 +268,7 @@ const sendMessage = async () => {
       @open-agent-selector="openAgentSelector"
       @select-agent="selectAgent"
       @select-session="selectSession"
+      @select-group="selectGroup"
     />
 
     <!-- 智能体选择弹窗 -->
@@ -254,55 +285,3 @@ const sendMessage = async () => {
     />
   </div>
 </template>
-
-<style scoped>
-::-webkit-scrollbar {
-  width: 6px;
-}
-
-::-webkit-scrollbar-track {
-  background: transparent;
-}
-
-::-webkit-scrollbar-thumb {
-  background: rgba(255, 255, 255, 0.08);
-  border-radius: 3px;
-}
-
-::-webkit-scrollbar-thumb:hover {
-  background: rgba(255, 255, 255, 0.15);
-}
-
-@keyframes messageSlideIn {
-  from {
-    opacity: 0;
-    transform: translateY(16px) scale(0.96);
-  }
-  to {
-    opacity: 1;
-    transform: translateY(0) scale(1);
-  }
-}
-
-.message-enter {
-  animation: messageSlideIn 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
-}
-
-@keyframes blink {
-  0%, 100% { opacity: 1; }
-  50% { opacity: 0; }
-}
-
-.cursor-blink {
-  animation: blink 1s step-end infinite;
-}
-
-@keyframes pulse-glow {
-  0%, 100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.4); }
-  50% { box-shadow: 0 0 20px 4px rgba(249, 115, 22, 0.2); }
-}
-
-.agent-glow {
-  animation: pulse-glow 2s ease-in-out infinite;
-}
-</style>

web/src/views/chat/chat.css

@@ -0,0 +1,51 @@
+/* Chat 页面样式 */
+
+::-webkit-scrollbar {
+  width: 6px;
+}
+
+::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+::-webkit-scrollbar-thumb {
+  background: rgba(255, 255, 255, 0.08);
+  border-radius: 3px;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  background: rgba(255, 255, 255, 0.15);
+}
+
+@keyframes messageSlideIn {
+  from {
+    opacity: 0;
+    transform: translateY(16px) scale(0.96);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.message-enter {
+  animation: messageSlideIn 0.4s cubic-bezier(0.22, 1, 0.36, 1) forwards;
+}
+
+@keyframes blink {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0; }
+}
+
+.cursor-blink {
+  animation: blink 1s step-end infinite;
+}
+
+@keyframes pulse-glow {
+  0%, 100% { box-shadow: 0 0 0 0 rgba(249, 115, 22, 0.4); }
+  50% { box-shadow: 0 0 20px 4px rgba(249, 115, 22, 0.2); }
+}
+
+.agent-glow {
+  animation: pulse-glow 2s ease-in-out infinite;
+}

web/src/views/chat/chat.ts

@@ -0,0 +1,591 @@
+import { ref, nextTick, onMounted, onUnmounted } from 'vue'
+import { marked } from 'marked'
+
+// 类型定义
+export interface ChatModel {
+  id: string
+  name: string
+  model_type: string
+  provider: string
+  model: string
+  status: string
+}
+
+export interface ChatMessage {
+  id: number
+  role: 'user' | 'assistant'
+  content: string
+  timestamp: Date
+  isStreaming?: boolean
+}
+
+export interface Agent {
+  id: number
+  name: string
+  avatar: string
+  description: string
+  accentColor: string
+  gradient: string
+  status: 'online' | 'offline'
+}
+
+export interface ChatSession {
+  id: string
+  title: string
+  agent_id: number
+  model_id?: string
+  last_message?: string
+  timestamp: Date
+  status?: string
+}
+
+export interface GroupChat {
+  id: number
+  name: string
+  members: string[]
+  lastMessage: string
+  timestamp: Date
+}
+
+// 配置 marked
+marked.setOptions({
+  breaks: true,
+  gfm: true
+})
+
+// 预处理内容：修复一些常见的 Markdown 问题
+const preprocessContent = (content: string): string => {
+  if (!content) return ''
+
+  // 1. 标题：# 标题 -> # 标题（确保 # 后有空格）
+  content = content.replace(/(^|\n)(#{1,6})([^\s#\n])/g, '$1$2 $3')
+
+  // 2. 无序列表：-项目 -> - 项目
+  content = content.replace(/(\n)(\s*)([-*+])(\S)/g, '$1$2$3 $4')
+
+  // 3. 有序列表：1.项目 -> 1. 项目
+  content = content.replace(/(\n)(\s*)(\d+\.)(\S)/g, '$1$2$3 $4')
+
+  // 4. 引用：>引用 -> > 引用
+  content = content.replace(/(\n)(>+)([^\s>\n])/g, '$1$2 $4')
+
+  // 5. 修复 ##1. 这种情况（连续处理）
+  content = content.replace(/#{1,6}\d+\./g, match => match.replace(/\d+\./, ' '))
+
+  return content
+}
+
+// 渲染 Markdown
+export const renderMarkdown = (content: string): string => {
+  if (!content) return ''
+  try {
+    const processed = preprocessContent(content)
+    return marked.parse(processed) as string
+  } catch (e) {
+    console.error('Markdown parse error:', e)
+    return content
+  }
+}
+
+// 根据 provider 获取图标
+export const getModelIcon = (provider: string) => {
+  const icons: Record<string, string> = {
+    'OpenAI': '🤖',
+    'Claude': '🧠',
+    'Google': '✨',
+    'Gemini': '✨',
+    'Ollama': '🦙',
+    'DeepSeek': '🔮',
+    'Moonshot': '🌙',
+    'Kimi': '🌙',
+    'Baidu': '🐉',
+    '文心一言': '🐉',
+    'Aliyun': '☁️',
+    'Ali': '☁️',
+    '通义千问': '☁️',
+    'Azure': '⬛',
+    'Anthropic': '🧠',
+  }
+  return icons[provider] || '💬'
+}
+
+// 创建 composable
+export function useChat() {
+  // 模型相关状态
+  const chatModels = ref<ChatModel[]>([])
+  const selectedModel = ref<ChatModel | null>(null)
+  const modelsLoading = ref(false)
+  const showModelDropdown = ref(false)
+
+  // 助手相关状态
+  const chatAgents = ref<Agent[]>([])
+  const selectedAgent = ref<Agent | null>(null)
+
+  // 消息相关状态
+  const messages = ref<ChatMessage[]>([])
+
+  // 历史对话
+  const chatSessions = ref<ChatSession[]>([])
+  const currentSessionId = ref<string | null>(null)
+
+  // 群聊
+  const groupChats = ref<GroupChat[]>([])
+
+  // 智能体选择弹窗
+  const showAgentSelector = ref(false)
+  const selectMode = ref<'single' | 'group'>('single')
+  const selectedAgents = ref<Agent[]>([])
+  const groupChatName = ref('')
+
+  // 输入相关
+  const inputMessage = ref('')
+  const isLoading = ref(false)
+
+  // 侧边栏
+  const sidebarCollapsed = ref(false)
+
+  // 获取模型列表（只获取 active 的 chat 模型）
+  const fetchModels = async () => {
+    modelsLoading.value = true
+    try {
+      const response = await fetch(`/model/list`)
+      const data = await response.json()
+      console.log('[Chat] Raw models:', data.list)
+
+      if (data.list) {
+        // 只过滤出 active 的 chat 模型 (status: 1=active, 0=inactive)
+        const activeChatModels = data.list.filter((m: ChatModel) =>
+          m.model_type === 'chat' && m.status === 1
+        )
+        console.log('[Chat] Filtered chat models:', activeChatModels)
+        chatModels.value = activeChatModels
+
+        // 默认选中第一个 active 的 chat 模型
+        if (chatModels.value.length > 0) {
+          selectedModel.value = chatModels.value[0]
+          console.log('[Chat] Selected model:', selectedModel.value)
+        }
+      }
+    } catch (error) {
+      console.error('Failed to fetch models:', error)
+    } finally {
+      modelsLoading.value = false
+    }
+  }
+
+  // 获取智能体列表
+  const fetchAgents = async () => {
+    try {
+      const response = await fetch('/api/agent/list')
+      const data = await response.json()
+      console.log('[Chat] Agents:', data)
+
+      if (data.agents) {
+        chatAgents.value = data.agents.map((agent: any) => ({
+          id: agent.id,
+          name: agent.name,
+          avatar: agent.avatar || '🧠',
+          description: agent.description || '',
+          accentColor: agent.accent_color || '#f97316',
+          gradient: 'from-orange-500/20 to-amber-500/20',
+          status: agent.status === 'active' ? 'online' : 'offline'
+        }))
+
+        // 默认选中第一个智能体
+        if (chatAgents.value.length > 0 && !selectedAgent.value) {
+          selectedAgent.value = chatAgents.value[0]
+        }
+      }
+    } catch (error) {
+      console.error('Failed to fetch agents:', error)
+    }
+  }
+
+  // 获取会话列表
+  const fetchSessions = async () => {
+    try {
+      const userId = localStorage.getItem('user_id') || 'default-user'
+      const response = await fetch(`/api/chat/sessions?user_id=${userId}&limit=50`)
+      const data = await response.json()
+      console.log('[Chat] Sessions:', data)
+
+      if (data.list) {
+        chatSessions.value = data.list.map((s: any) => ({
+          id: s.id,
+          title: s.title || '新会话',
+          agent_id: s.agent_id,
+          model_id: s.model_id,
+          last_message: s.last_message,
+          timestamp: new Date(s.created_at || Date.now()),
+          status: s.status
+        }))
+      }
+    } catch (error) {
+      console.error('Failed to fetch sessions:', error)
+    }
+  }
+
+  // 获取群聊列表
+  const fetchGroups = async () => {
+    try {
+      const userId = localStorage.getItem('user_id') || 'default-user'
+      const response = await fetch(`/api/chat/groups?user_id=${userId}`)
+      const data = await response.json()
+      console.log('[Chat] Groups:', data)
+
+      if (data.list) {
+        groupChats.value = data.list.map((g: any) => ({
+          id: g.id,
+          name: g.name,
+          members: g.agent_ids ? JSON.parse(g.agent_ids) : [],
+          lastMessage: g.description || '',
+          timestamp: new Date(g.created_at || Date.now())
+        }))
+      }
+    } catch (error) {
+      console.error('Failed to fetch groups:', error)
+    }
+  }
+
+  // 创建群聊
+  const createGroup = async (name: string, agentIds: number[]) => {
+    try {
+      const userId = localStorage.getItem('user_id') || 'default-user'
+      const response = await fetch('/api/chat/groups', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          user_id: userId,
+          name: name,
+          agent_ids: JSON.stringify(agentIds)
+        })
+      })
+      const group = await response.json()
+      console.log('[Chat] Created group:', group)
+
+      // 添加到群聊列表
+      groupChats.value.unshift({
+        id: group.id,
+        name: group.name,
+        members: agentIds.map(id => String(id)),
+        lastMessage: '',
+        timestamp: new Date()
+      })
+
+      return group
+    } catch (error) {
+      console.error('Failed to create group:', error)
+      return null
+    }
+  }
+
+  // 创建新会话
+  const createSession = async (title: string = '新会话') => {
+    try {
+      const userId = localStorage.getItem('user_id') || 'default-user'
+      const response = await fetch('/api/chat/sessions', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          user_id: userId,
+          agent_id: selectedAgent.value?.id || 1,
+          title: title,
+          model_id: selectedModel.value?.id
+        })
+      })
+      const session = await response.json()
+      console.log('[Chat] Created session:', session)
+
+      // 添加到会话列表
+      chatSessions.value.unshift({
+        id: session.id,
+        title: session.title || title,
+        agent_id: session.agent_id,
+        model_id: session.model_id,
+        timestamp: new Date()
+      })
+
+      currentSessionId.value = session.id
+      return session
+    } catch (error) {
+      console.error('Failed to create session:', error)
+      return null
+    }
+  }
+
+  // 获取会话历史消息
+  const fetchSessionMessages = async (sessionId: string) => {
+    try {
+      const response = await fetch(`/api/chat/sessions/${sessionId}/messages?limit=100`)
+      const data = await response.json()
+      console.log('[Chat] Messages:', data)
+
+      if (data.list) {
+        messages.value = data.list.map((m: any) => ({
+          id: m.id,
+          role: m.role as 'user' | 'assistant',
+          content: m.content,
+          timestamp: new Date(m.created_at)
+        }))
+      }
+    } catch (error) {
+      console.error('Failed to fetch messages:', error)
+    }
+  }
+
+  // 保存消息到后端
+  const saveMessage = async (role: 'user' | 'assistant', content: string) => {
+    if (!currentSessionId.value) return
+
+    try {
+      await fetch('/api/chat/messages', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          session_id: currentSessionId.value,
+          role: role,
+          content: content
+        })
+      })
+    } catch (error) {
+      console.error('Failed to save message:', error)
+    }
+  }
+
+  // 更新会话标题
+  const updateSessionTitle = async (sessionId: string, title: string) => {
+    try {
+      await fetch(`/api/chat/sessions/${sessionId}`, {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ title })
+      })
+    } catch (error) {
+      console.error('Failed to update session:', error)
+    }
+  }
+
+  // 删除会话
+  const deleteSession = async (sessionId: string) => {
+    try {
+      await fetch(`/api/chat/sessions/${sessionId}`, { method: 'DELETE' })
+      chatSessions.value = chatSessions.value.filter(s => s.id !== sessionId)
+
+      // 如果删除的是当前会话，清空消息
+      if (currentSessionId.value === sessionId) {
+        currentSessionId.value = null
+        messages.value = []
+      }
+    } catch (error) {
+      console.error('Failed to delete session:', error)
+    }
+  }
+
+  // 打开智能体选择器
+  const openAgentSelector = (mode: 'single' | 'group') => {
+    selectMode.value = mode
+    selectedAgents.value = []
+    groupChatName.value = ''
+    showAgentSelector.value = true
+  }
+
+  // 切换智能体选择
+  const toggleAgentSelection = (agent: Agent) => {
+    if (selectMode.value === 'single') {
+      // 单选模式：直接设置为只有一个
+      selectedAgents.value = [agent]
+    } else {
+      // 群聊模式：切换选择状态
+      const index = selectedAgents.value.findIndex(a => a.id === agent.id)
+      if (index > -1) {
+        selectedAgents.value.splice(index, 1)
+      } else {
+        selectedAgents.value.push(agent)
+      }
+    }
+  }
+
+  // 确认选择
+  const confirmAgentSelection = async () => {
+    if (selectMode.value === 'single') {
+      if (selectedAgents.value.length > 0) {
+        selectedAgent.value = selectedAgents.value[0]
+
+        // 创建新会话
+        const session = await createSession()
+        if (session) {
+          currentSessionId.value = session.id
+        }
+
+        messages.value = [
+          { id: Date.now(), role: 'assistant', content: `你好！我是 ${selectedAgent.value.name}，你的 AI 助手。有什么我可以帮助你的吗？`, timestamp: new Date() }
+        ]
+
+        // 保存助手欢迎消息
+        if (currentSessionId.value) {
+          await saveMessage('assistant', messages.value[0].content)
+        }
+      }
+    } else {
+      const name = groupChatName.value.trim() || `群聊 (${selectedAgents.value.length}人)`
+      const agentIds = selectedAgents.value.map(a => a.id)
+
+      // 调用后端 API 创建群聊
+      const group = await createGroup(name, agentIds)
+
+      if (!group) {
+        // 如果 API 调用失败，使用本地数据
+        groupChats.value.unshift({
+          id: Date.now(),
+          name: name,
+          members: selectedAgents.value.map(a => a.name),
+          lastMessage: 'New group created',
+          timestamp: new Date()
+        })
+      }
+    }
+    showAgentSelector.value = false
+  }
+
+  // 取消选择
+  const cancelAgentSelection = () => {
+    showAgentSelector.value = false
+  }
+
+  // 选择助手
+  const selectAgent = (agent: Agent) => {
+    selectedAgent.value = agent
+    messages.value = [
+      { id: 1, role: 'assistant', content: `你好！我是 ${agent.name}。有什么我可以帮助你的吗？`, timestamp: new Date() }
+    ]
+  }
+
+  // 选择群聊
+  const selectGroup = (group: GroupChat) => {
+    messages.value = [
+      { id: 1, role: 'assistant', content: `你好！欢迎进入群聊 "${group.name}"，${group.members.length} 位智能体已加入。`, timestamp: new Date() }
+    ]
+  }
+
+  // 选择历史对话
+  const selectSession = async (session: ChatSession) => {
+    const agent = chatAgents.value.find(a => a.id === session.agent_id)
+    if (agent) {
+      selectedAgent.value = agent
+    }
+
+    currentSessionId.value = session.id
+    await fetchSessionMessages(session.id)
+  }
+
+  // 新建聊天 - 先打开智能体选择器
+  const newChat = () => {
+    // 打开智能体选择器，让用户选择智能体
+    openAgentSelector('single')
+  }
+
+  // 清空对话
+  const clearMessages = () => {
+    messages.value = []
+  }
+
+  // 格式化时间
+  const formatTime = (date: Date) => {
+    return date.toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' })
+  }
+
+  // 格式化相对时间
+  const formatRelativeTime = (date: Date) => {
+    const now = new Date()
+    const diff = now.getTime() - date.getTime()
+    const hours = Math.floor(diff / 3600000)
+    const days = Math.floor(diff / 86400000)
+
+    if (hours < 1) return '刚刚'
+    if (hours < 24) return `${hours}小时前`
+    if (days < 7) return `${days}天前`
+    return date.toLocaleDateString('zh-CN')
+  }
+
+  // 切换侧边栏
+  const toggleSidebar = () => {
+    sidebarCollapsed.value = !sidebarCollapsed.value
+  }
+
+  // 点击外部关闭下拉框
+  const handleClickOutside = (e: MouseEvent) => {
+    const target = e.target as HTMLElement
+    if (!target.closest('.model-dropdown')) {
+      showModelDropdown.value = false
+    }
+  }
+
+  // 初始化
+  const init = () => {
+    fetchModels()
+    fetchAgents()
+    fetchSessions()
+    fetchGroups()
+    document.addEventListener('click', handleClickOutside)
+  }
+
+  // 清理
+  const cleanup = () => {
+    document.removeEventListener('click', handleClickOutside)
+  }
+
+  return {
+    // 模型
+    chatModels,
+    selectedModel,
+    modelsLoading,
+    showModelDropdown,
+    fetchModels,
+    fetchAgents,
+    // 助手
+    chatAgents,
+    selectedAgent,
+    selectAgent,
+    selectGroup,
+    // 消息
+    messages,
+    newChat,
+    clearMessages,
+    // 历史对话
+    chatSessions,
+    currentSessionId,
+    selectSession,
+    fetchSessions,
+    createSession,
+    fetchSessionMessages,
+    saveMessage,
+    updateSessionTitle,
+    deleteSession,
+    // 群聊
+    groupChats,
+    fetchGroups,
+    createGroup,
+    // 智能体选择
+    showAgentSelector,
+    selectMode,
+    selectedAgents,
+    groupChatName,
+    openAgentSelector,
+    toggleAgentSelection,
+    confirmAgentSelection,
+    cancelAgentSelection,
+    // 输入
+    inputMessage,
+    isLoading,
+    // 侧边栏
+    sidebarCollapsed,
+    toggleSidebar,
+    // 工具
+    formatTime,
+    formatRelativeTime,
+    getModelIcon,
+    // 生命周期
+    init,
+    cleanup,
+  }
+}