const API = require('../../../utils/api.js')

Page({
  data: {
    messages: [],
    inputValue: '',
    inputFocus: false,
    isTyping: false,
    scrollToMessage: '',
    quickQuestions: [
      '怎么加入暖橙团队？',
      '陪诊服务的流程是什么？',
      '如何预约陪诊服务？',
      '陪诊服务收费标准？'
    ]
  },

  messageIdCounter: 0,

  onLoad() {
    this.loadChatHistory()
    this.initSocketListeners()
  },

  onUnload() {
    this.removeSocketListeners()
  },

  onShow() {
    this.setData({ inputFocus: true })
  },

  initSocketListeners() {
    const app = getApp()
    const socket = app.globalData.chatSocket
    if (!socket) return

    this._onSocketMessage = (data) => {
      if (data && data.type === 'ai') {
        this.handleAIReply(data)
      }
    }

    this._onSocketError = (err) => {
      console.error('[AIChat] WebSocket error', err)
      this.handleAIError('网络连接失败，请检查网络设置')
    }

    socket.onMessage(this._onSocketMessage)
    socket.onError(this._onSocketError)
  },

  removeSocketListeners() {
    const app = getApp()
    const socket = app.globalData.chatSocket
    if (!socket) return

    if (this._onSocketMessage) {
      socket.onMessage(null)
    }
    if (this._onSocketError) {
      socket.onError(null)
    }
  },

  handleAIReply(data) {
    let messages = null
    if (this.data.messages.length > 0) {
      let lastMessage = this.data.messages[this.data.messages.length - 1]
      if (lastMessage.type === 'ai' && lastMessage._serverId === data.id) {
        lastMessage.content += data.content || ''
        messages = this.data.messages
      }
    }

    if (!messages) {
      const aiResponse = {
        id: `msg_${++this.messageIdCounter}`,
        _serverId: data.id,
        type: 'ai',
        contentType: 'text',
        content: data.content || '',
        time: this.formatTime(new Date())
      }

      if (data.sessionId) {
        wx.setStorageSync('ai_session_id', data.sessionId)
      }

      messages = [...this.data.messages, aiResponse]
    }

    this.setData({
      messages: messages,
      isTyping: false
    })
    this.saveChatHistory(messages)
    this.scrollToBottom()
  },

  loadChatHistory() {
    try {
      const history = wx.getStorageSync('ai_chat_history')
      if (history && history.length > 0) {
        this.setData({ messages: history })
        this.scrollToBottom()
      }
    } catch (e) {
      console.log('加载聊天记录失败', e)
    }
  },

  saveChatHistory(messages) {
    try {
      wx.setStorageSync('ai_chat_history', messages)
    } catch (e) {
      console.log('保存聊天记录失败', e)
    }
  },

  onInputChange(e) {
    this.setData({ inputValue: e.detail.value })
  },

  onQuickQuestionTap(e) {
    const question = e.currentTarget.dataset.question
    this.setData({ inputValue: question })
    this.sendMessage()
  },

  sendMessage() {
    const content = this.data.inputValue.trim()
    if (!content) return

    const userMessage = {
      id: `msg_${++this.messageIdCounter}`,
      type: 'user',
      contentType: 'text',
      content: content,
      time: this.formatTime(new Date())
    }

    const messages = [...this.data.messages, userMessage]
    this.setData({
      messages: messages,
      inputValue: '',
      isTyping: true
    })

    this.saveChatHistory(messages)
    this.scrollToBottom()

    this.sendToAI(content)
  },

  sendToAI(content, type = 'chat') {
    const app = getApp()
    const user = app.globalData.user
    const socket = app.globalData.chatSocket

    if (!socket.isConnected) {
      socket.connect()
    }

    if (socket) {
      socket.send({
        type: type,
        content: content,
        userId: user ? user._id : '',
        appId: app.globalData.appId
      })
    } else {
      // 处理连接失败的情况
      this.handleAIError('网络连接失败，请检查网络设置')
    }
  },

  handleAIError(errorMessage) {
    const errorResponse = {
      id: `msg_${++this.messageIdCounter}`,
      type: 'ai',
      contentType: 'text',
      content: errorMessage,
      time: this.formatTime(new Date())
    }

    const messages = [...this.data.messages, errorResponse]
    this.setData({
      messages: messages,
      isTyping: false
    })
    this.saveChatHistory(messages)
    this.scrollToBottom()
  },

  scrollToBottom() {
    setTimeout(() => {
      const lastMessage = this.data.messages[this.data.messages.length - 1]
      if (lastMessage) {
        this.setData({
          scrollToMessage: `msg-${lastMessage.id}`
        })
      }
    }, 100)
  },

  previewImage(e) {
    const src = e.currentTarget.dataset.src
    wx.previewImage({
      urls: [src],
      current: src
    })
  },

  formatTime(date) {
    const hours = String(date.getHours()).padStart(2, '0')
    const minutes = String(date.getMinutes()).padStart(2, '0')
    return `${hours}:${minutes}`
  },

  clearChat() {
    wx.showModal({
      title: '确认清空',
      content: '确定要清空所有聊天记录吗？',
      success: (res) => {
        if (res.confirm) {
          this.sendToAI('clear', 'clear')
          this.setData({ messages: [] })
          wx.removeStorageSync('ai_chat_history')
          wx.removeStorageSync('ai_session_id')
        }
      }
    })
  }
})