// 聊天页面逻辑
const { API, WebSocketManager, util, constants } = require('../../utils/api.js')
const { formatRelativeTime } = util
const { MESSAGE_TYPE, WS_MESSAGE_TYPE } = constants

Page({
  data: {
    messages: [],
    inputValue: '',
    sending: false,
    isTyping: false,
    showHistoryTip: false,
    websocketManager: null,
    lastMessageId: '',
    isConnected: false,
    currentPage: 1
  },

  onLoad() {
    this.initWebSocket()
    this.loadChatHistory()
    this.addWelcomeMessage()
  },

  onUnload() {
    if (this.data.websocketManager) {
      this.data.websocketManager.disconnect()
    }
  },

  // 添加欢迎消息
  addWelcomeMessage() {
    const welcomeMessage = {
      id: util.generateUniqueId(),
      content: '你好！我是智控未来的AI助手，有什么可以帮你的吗？',
      type: MESSAGE_TYPE.TEXT,
      isMe: false,
      nickname: '智控未来',
      avatar: '/assets/images/ai-avatar.png',
      time: formatRelativeTime(new Date())
    }
    this.addMessage(welcomeMessage)
  },

  // 初始化WebSocket连接
  initWebSocket() {
    const manager = new WebSocketManager()
    const app = getApp()
    
    manager.onMessage(WS_MESSAGE_TYPE.MESSAGE, (data) => {
      this.handleNewMessage(data)
    })
    
    manager.onMessage(WS_MESSAGE_TYPE.SYSTEM, (data) => {
      this.handleSystemMessage(data)
    })
    
    manager.connect(app.globalData.websocketUrl || 'wss://pactgo.cn/api/v1/ws/control')
    
    this.setData({
      websocketManager: manager,
      isConnected: true
    })
  },

  // 加载聊天记录
  async loadChatHistory() {
    try {
      // 模拟加载历史消息
      const mockHistory = this.getMockHistoryMessages()
      if (mockHistory.length > 0) {
        this.setData({
          messages: mockHistory,
          showHistoryTip: true
        })
        this.scrollToBottom()
      }
    } catch (error) {
      console.error('加载聊天记录失败:', error)
    }
  },

  // 加载更多历史消息
  loadMoreHistory() {
    if (this.data.currentPage < 3) { // 模拟加载3页历史
      this.setData({ currentPage: this.data.currentPage + 1 })
      const moreHistory = this.getMockHistoryMessages(this.data.currentPage)
      if (moreHistory.length > 0) {
        const updatedMessages = [...moreHistory, ...this.data.messages]
        this.setData({ messages: updatedMessages })
      }
    }
  },

  // 模拟历史消息
  getMockHistoryMessages(page = 1) {
    const messages = []
    if (page === 1) {
      messages.push({
        id: 'history-1',
        content: '你好，我是智控未来的AI助手',
        type: MESSAGE_TYPE.TEXT,
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: '昨天 14:30'
      })
      messages.push({
        id: 'history-2',
        content: '你能做什么？',
        type: MESSAGE_TYPE.TEXT,
        isMe: true,
        nickname: '我',
        avatar: '/assets/images/user-avatar.png',
        time: '昨天 14:31'
      })
      messages.push({
        id: 'history-3',
        content: '我可以帮你解答问题、提供信息、生成内容等。请问有什么具体需求吗？',
        type: MESSAGE_TYPE.TEXT,
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: '昨天 14:32'
      })
    } else if (page === 2) {
      messages.push({
        id: 'history-4',
        content: '如何学习编程？',
        type: MESSAGE_TYPE.TEXT,
        isMe: true,
        nickname: '我',
        avatar: '/assets/images/user-avatar.png',
        time: '昨天 15:00'
      })
      messages.push({
        id: 'history-5',
        content: '<p>学习编程的步骤：</p><ol><li>选择一门编程语言，如Python、JavaScript等</li><li>学习基础语法和概念</li><li>实践项目，积累经验</li><li>参与社区，学习他人的代码</li></ol>',
        type: MESSAGE_TYPE.richText,
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: '昨天 15:01'
      })
    }
    return messages
  },

  // 处理新消息
  handleNewMessage(data) {
    this.setData({ isTyping: false })
    
    // 模拟不同类型的消息
    if (data.content.includes('代码')) {
      const codeMessage = {
        id: data.id || util.generateUniqueId(),
        content: 'def hello():\n    print("Hello, World!")',
        type: 'code',
        language: 'Python',
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: formatRelativeTime(new Date())
      }
      this.addMessage(codeMessage)
    } else if (data.content.includes('卡片')) {
      const cardMessage = {
        id: data.id || util.generateUniqueId(),
        type: 'buttonCard',
        title: '选择一个选项',
        buttons: [
          { id: '1', text: '选项一', action: 'option1' },
          { id: '2', text: '选项二', action: 'option2' }
        ],
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: formatRelativeTime(new Date())
      }
      this.addMessage(cardMessage)
    } else if (data.content.includes('富文本')) {
      const richTextMessage = {
        id: data.id || util.generateUniqueId(),
        content: '<h3>标题</h3><p>这是一段<b>加粗</b>的文本，包含<ul><li>无序列表项1</li><li>无序列表项2</li></ul></p>',
        type: 'richText',
        isMe: false,
        nickname: '智控未来',
        avatar: '/assets/images/ai-avatar.png',
        time: formatRelativeTime(new Date())
      }
      this.addMessage(richTextMessage)
    } else {
      const message = {
        id: data.id || util.generateUniqueId(),
        content: data.content,
        type: data.type || MESSAGE_TYPE.TEXT,
        isMe: false,
        nickname: data.nickname || '智控未来',
        avatar: data.avatar || '/assets/images/ai-avatar.png',
        time: formatRelativeTime(new Date())
      }
      this.addMessage(message)
    }
  },

  // 处理系统消息
  handleSystemMessage(data) {
    const message = {
      id: data.id || util.generateUniqueId(),
      content: data.content,
      type: MESSAGE_TYPE.SYSTEM,
      isMe: false,
      nickname: '系统',
      avatar: '/assets/images/system-avatar.png',
      time: formatRelativeTime(new Date())
    }
    this.addMessage(message)
  },

  // 添加消息
  addMessage(message) {
    const messages = [...this.data.messages, message]
    this.setData({
      messages: messages,
      lastMessageId: message.id
    })
    this.scrollToBottom()
  },

  // 滚动到底部
  scrollToBottom() {
    setTimeout(() => {
      if (this.data.messages.length > 0) {
        const lastMessage = this.data.messages[this.data.messages.length - 1]
        this.setData({
          lastMessageId: lastMessage.id
        })
      }
    }, 100)
  },

  // 输入变化
  onInputChange(e) {
    this.setData({
      inputValue: e.detail.value
    })
  },

  // 发送消息
  async sendMessage() {
    const content = this.data.inputValue.trim()
    if (!content || this.data.sending) {
      return
    }
    
    this.setData({
      sending: true,
      isTyping: true
    })
    
    // 添加用户消息到界面
    const userMessage = {
      id: util.generateUniqueId(),
      content: content,
      type: MESSAGE_TYPE.TEXT,
      isMe: true,
      nickname: '我',
      avatar: '/assets/images/user-avatar.png',
      time: formatRelativeTime(new Date())
    }
    
    this.addMessage(userMessage)
    
    try {
      // 模拟AI回复
      setTimeout(() => {
        const aiResponse = {
          id: util.generateUniqueId(),
          content: this.getMockAIResponse(content),
          type: MESSAGE_TYPE.TEXT,
          isMe: false,
          nickname: '智控未来',
          avatar: '/assets/images/ai-avatar.png',
          time: formatRelativeTime(new Date())
        }
        this.handleNewMessage(aiResponse)
      }, 1500)
      
      this.setData({
        inputValue: '',
        sending: false
      })
    } catch (error) {
      console.error('发送消息失败:', error)
      util.showError('发送失败，请重试')
      this.setData({
        sending: false,
        isTyping: false
      })
    }
  },

  // 模拟AI回复
  getMockAIResponse(content) {
    const responses = {
      '你好': '你好！很高兴为你服务。',
      '今天天气怎么样': '今天天气晴朗，适合户外活动。',
      '如何学习编程': '学习编程需要持之以恒，建议从基础语法开始，多动手实践。',
      '代码': 'def hello():\n    print("Hello, World!")',
      '卡片': '这是一个卡片消息',
      '富文本': '这是一段富文本消息，包含<b>加粗</b>和<u>下划线</u>。',
      '今天是几月几日': '今天是' + new Date().toLocaleDateString('zh-CN'),
      '你是谁': '我是智控未来的AI助手，由LMStudio提供支持。'
    }
    return responses[content] || '感谢你的提问，我会为你提供准确的回答。'
  },

  // 长按消息
  onMessageLongPress(e) {
    const messageId = e.currentTarget.dataset.messageId
    const message = this.data.messages.find(msg => msg.id === messageId)
    
    if (message && message.type === MESSAGE_TYPE.TEXT) {
      wx.showActionSheet({
        itemList: ['复制消息', '删除消息'],
        success: (res) => {
          switch (res.tapIndex) {
            case 0:
              this.copyMessage(message.content)
              break
            case 1:
              this.deleteMessage(messageId)
              break
          }
        }
      })
    }
  },

  // 复制消息
  copyMessage(content) {
    wx.setClipboardData({
      data: content,
      success: () => {
        wx.showToast({
          title: '复制成功',
          icon: 'success'
        })
      }
    })
  },

  // 删除消息
  deleteMessage(messageId) {
    const updatedMessages = this.data.messages.filter(msg => msg.id !== messageId)
    this.setData({ messages: updatedMessages })
    wx.showToast({
      title: '已删除',
      icon: 'success'
    })
  },

  // 复制代码
  copyCode(e) {
    const content = e.currentTarget.dataset.content
    wx.setClipboardData({
      data: content,
      success: () => {
        wx.showToast({
          title: '代码已复制',
          icon: 'success'
        })
      }
    })
  },

  // 预览图片
  previewImage(e) {
    const url = e.currentTarget.dataset.url
    wx.previewImage({
      urls: [url]
    })
  },

  // 卡片按钮点击
  onCardButtonTap(e) {
    const action = e.currentTarget.dataset.action
    wx.showToast({
      title: `你点击了${action}`,
      icon: 'none'
    })
  },

  // 清空聊天记录
  clearChatHistory() {
    wx.showModal({
      title: '清空聊天记录',
      content: '确定要清空所有聊天记录吗？此操作不可恢复。',
      confirmText: '清空',
      confirmColor: '#dd524d',
      success: (res) => {
        if (res.confirm) {
          this.setData({
            messages: [],
            lastMessageId: ''
          })
          
          // 清空本地存储
          wx.removeStorageSync('chatHistory')
          
          wx.showToast({
            title: '已清空',
            icon: 'success'
          })
        }
      }
    })
  }
})