// 获取应用实例
const app = getApp()

Page({
  data: {
    // 专家信息
    expertInfo: {
      id: 1,
      name: '张明专家',
      title: '资深畜牧兽医',
      expertise: '牛羊疾病防治',
      avatar: '/images/avatars/expert1.png',
      online: true,
      phone: '13800138000'
    },
    
    // 用户信息
    userInfo: {
      id: 1001,
      name: '养殖户',
      avatar: '/images/avatars/user.png'
    },
    
    // 消息列表
    messageList: [],
    scrollToView: '',
    
    // 输入相关
    inputValue: '',
    inputFocus: false,
    inputMode: 'keyboard', // keyboard or voice
    inputPlaceholder: '输入消息...',
    
    // 多媒体
    showMediaSheet: false,
    
    // 录音相关
    isRecording: false,
    recordingTime: 0,
    recordingTip: '上滑取消录音',
    recordingTimer: null,
    recordManager: null,
    
    // 页面状态
    isFirstLoad: true,
    showDateDivider: true,
    todayDate: '',
    
    // 消息ID计数器
    messageId: 1000,
    
    // 存储键名
    storageKey: 'consult_messages_'
  },

  onLoad: function(options) {
    // 初始化录音管理器
    this.initRecordManager()
    
    // 获取今天日期
    this.setTodayDate()
    
    // 加载用户信息
    this.loadUserInfo()
    
    // 加载专家信息
    if (options.expertId) {
      this.loadExpertInfo(options.expertId)
    }
    
    // 加载聊天记录
    this.loadChatHistory()
    
    // 设置键盘监听
    wx.onKeyboardHeightChange(this.onKeyboardHeightChange)
    
    // 模拟首次进入时的欢迎消息
    setTimeout(() => {
      this.setData({ isFirstLoad: false })
    }, 2000)
  },

  onUnload: function() {
    // 清理定时器
    if (this.data.recordingTimer) {
      clearInterval(this.data.recordingTimer)
    }
    
    // 移除监听器
    wx.offKeyboardHeightChange()
    
    // 保存聊天记录
    this.saveChatHistory()
  },

  onShow: function() {
    // 页面显示时自动滚动到底部
    setTimeout(() => {
      this.scrollToBottom()
    }, 300)
  },

  // 初始化录音管理器
  initRecordManager: function() {
    this.recordManager = wx.getRecorderManager()
    
    this.recordManager.onStart(() => {
      console.log('录音开始')
    })
    
    this.recordManager.onStop((res) => {
      const { tempFilePath, duration } = res
      if (tempFilePath) {
        this.sendAudioMessage(tempFilePath, Math.floor(duration / 1000))
      }
    })
    
    this.recordManager.onError((err) => {
      console.error('录音失败:', err)
      wx.showToast({
        title: '录音失败',
        icon: 'none'
      })
      this.setData({ isRecording: false })
    })
  },

  // 设置今天日期
  setTodayDate: function() {
    const now = new Date()
    const month = now.getMonth() + 1
    const date = now.getDate()
    const week = ['日', '一', '二', '三', '四', '五', '六'][now.getDay()]
    this.setData({
      todayDate: `${month}月${date}日 星期${week}`
    })
  },

  // 加载用户信息
  loadUserInfo: function() {
    const userInfo = wx.getStorageSync('userInfo') || this.data.userInfo
    this.setData({ userInfo })
  },

  // 加载专家信息
  loadExpertInfo: function(expertId) {
    // 这里应该是API请求，暂时使用模拟数据
    wx.showLoading({ title: '加载中...' })
    
    setTimeout(() => {
      const expertInfo = {
        id: expertId,
        name: ['张明', '李华', '王强', '赵刚'][expertId - 1] + '专家',
        title: '资深畜牧兽医',
        expertise: '牛羊疾病防治',
        avatar: `/images/avatars/expert${expertId}.png`,
        online: Math.random() > 0.3,
        phone: '138' + Math.floor(Math.random() * 100000000).toString().padStart(8, '0')
      }
      
      this.setData({
        expertInfo,
        storageKey: `consult_messages_${expertId}_${this.data.userInfo.id}`
      })
      
      wx.hideLoading()
    }, 500)
  },

  // 加载聊天记录
  loadChatHistory: function() {
    const storageKey = this.data.storageKey
    const savedMessages = wx.getStorageSync(storageKey) || []
    
    if (savedMessages.length > 0) {
      // 处理消息时间显示
      const processedMessages = this.processMessageTimes(savedMessages)
      this.setData({
        messageList: processedMessages,
        isFirstLoad: false
      })
      
      // 滚动到底部
      setTimeout(() => {
        this.scrollToBottom()
      }, 200)
    } else {
      // 初始化第一条欢迎消息
      this.initWelcomeMessage()
    }
  },

  // 处理消息时间显示
  processMessageTimes: function(messages) {
    if (!messages || messages.length === 0) return messages
    
    let lastTimestamp = 0
    
    return messages.map((msg, index) => {
      const currentTimestamp = msg.timestamp
      
      // 如果两条消息间隔超过5分钟，显示时间
      const timeDiff = currentTimestamp - lastTimestamp
      msg.showTime = timeDiff > 5 * 60 * 1000 || index === 0
      
      if (msg.showTime) {
        lastTimestamp = currentTimestamp
      }
      
      return msg
    })
  },

  // 初始化欢迎消息
  initWelcomeMessage: function() {
    const welcomeMessage = {
      id: 'welcome-' + Date.now(),
      sender: 'expert',
      type: 'text',
      content: '您好，我是' + this.data.expertInfo.name + '，有什么可以帮您？',
      timestamp: Date.now() - 60000,
      showTime: true
    }
    
    this.setData({
      messageList: [welcomeMessage]
    })
  },

  // 保存聊天记录
  saveChatHistory: function() {
    const { storageKey, messageList } = this.data
    if (messageList.length > 0) {
      try {
        wx.setStorageSync(storageKey, messageList)
      } catch (e) {
        console.error('保存聊天记录失败:', e)
      }
    }
  },

  // 返回上一页
  goBack: function() {
    wx.navigateBack()
  },

  // 打电话
  makePhoneCall: function() {
    const phone = this.data.expertInfo.phone
    wx.makePhoneCall({
      phoneNumber: phone,
      fail: () => {
        wx.showToast({
          title: '拨打失败',
          icon: 'none'
        })
      }
    })
  },

  // 输入处理
  onInput: function(e) {
    this.setData({
      inputValue: e.detail.value
    })
  },

  // 发送文本消息
  sendTextMessage: function() {
    const content = this.data.inputValue.trim()
    if (!content) return
    
    const newMessage = {
      id: 'msg-' + (++this.data.messageId),
      sender: 'user',
      type: 'text',
      content: content,
      timestamp: Date.now(),
      status: 'sending'
    }
    
    // 添加到消息列表
    this.addMessageToList(newMessage)
    
    // 清空输入框
    this.setData({
      inputValue: '',
      inputFocus: false
    })
    
    // 模拟发送成功
    setTimeout(() => {
      this.updateMessageStatus(newMessage.id, 'success')
      
      // 模拟专家回复
      setTimeout(() => {
        this.receiveExpertReply()
      }, 1000)
    }, 500)
  },

  // 添加消息到列表
  addMessageToList: function(message) {
    const { messageList } = this.data
    
    // 确定是否需要显示时间
    const lastMessage = messageList[messageList.length - 1]
    const timeDiff = lastMessage ? message.timestamp - lastMessage.timestamp : 0
    message.showTime = timeDiff > 5 * 60 * 1000 || !lastMessage
    
    messageList.push(message)
    
    this.setData({
      messageList,
      scrollToView: 'msg-' + message.id
    })
  },

  // 更新消息状态
  updateMessageStatus: function(messageId, status) {
    const { messageList } = this.data
    const index = messageList.findIndex(msg => msg.id === messageId)
    
    if (index !== -1) {
      messageList[index].status = status
      this.setData({ messageList })
    }
  },

  // 接收专家回复
  receiveExpertReply: function() {
    const replies = [
      '收到您的消息，让我分析一下您说的情况。',
      '建议您提供更多细节，比如发病时间、具体症状等。',
      '根据描述，可能是饲料问题引起的，建议调整饲料配方。',
      '可以考虑添加一些维生素补充剂，改善食欲问题。',
      '最好能提供照片，这样我可以更准确地判断情况。'
    ]
    
    const randomReply = replies[Math.floor(Math.random() * replies.length)]
    
    const newMessage = {
      id: 'exp-' + Date.now(),
      sender: 'expert',
      type: 'text',
      content: randomReply,
      timestamp: Date.now(),
      showTime: false
    }
    
    this.addMessageToList(newMessage)
  },

  // 切换输入模式
  switchInputMode: function() {
    const newMode = this.data.inputMode === 'keyboard' ? 'voice' : 'keyboard'
    const placeholder = newMode === 'voice' ? '按住说话' : '输入消息...'
    
    this.setData({
      inputMode: newMode,
      inputPlaceholder: placeholder,
      inputFocus: newMode === 'keyboard'
    })
  },

  // 显示多媒体选择面板
  showMediaActionSheet: function() {
    this.setData({
      showMediaSheet: true,
      inputFocus: false
    })
  },

  // 隐藏多媒体选择面板
  hideMediaActionSheet: function() {
    this.setData({
      showMediaSheet: false
    })
  },

  // 选择图片
  chooseImage: function() {
    this.hideMediaActionSheet()
    
    wx.chooseImage({
      count: 9,
      sizeType: ['compressed'],
      sourceType: ['album'],
      success: (res) => {
        this.uploadImages(res.tempFilePaths)
      }
    })
  },

  // 拍照
  takePhoto: function() {
    this.hideMediaActionSheet()
    
    wx.chooseImage({
      count: 1,
      sizeType: ['compressed'],
      sourceType: ['camera'],
      success: (res) => {
        this.uploadImages(res.tempFilePaths)
      }
    })
  },

  // 选择视频
  chooseVideo: function() {
    this.hideMediaActionSheet()
    
    wx.chooseVideo({
      sourceType: ['album'],
      compressed: true,
      maxDuration: 60,
      success: (res) => {
        this.uploadVideo(res.tempFilePath, res.thumbTempFilePath)
      }
    })
  },

  // 录制语音
  recordAudio: function() {
    this.hideMediaActionSheet()
    this.startVoiceRecord()
  },

  // 选择文件
  chooseFile: function() {
    this.hideMediaActionSheet()
    
    wx.chooseMessageFile({
      count: 1,
      type: 'all',
      success: (res) => {
        const file = res.tempFiles[0]
        this.uploadFile(file.path, file.name, file.size)
      }
    })
  },

  // 上传图片
  uploadImages: function(tempFilePaths) {
    tempFilePaths.forEach((tempFilePath, index) => {
      const fileName = 'image_' + Date.now() + '_' + index + '.jpg'
      this.uploadFile(tempFilePath, fileName, 0, 'image')
    })
  },

  // 上传视频
  uploadVideo: function(tempFilePath, thumbPath) {
    const fileName = 'video_' + Date.now() + '.mp4'
    this.uploadFile(tempFilePath, fileName, 0, 'video', thumbPath)
  },

  // 通用文件上传
  uploadFile: function(tempFilePath, fileName, fileSize = 0, type = 'file', thumbPath = '') {
    // 获取文件扩展名
    const extension = fileName.split('.').pop().toLowerCase()
    
    // 创建消息
    const messageId = 'file-' + Date.now()
    const message = {
      id: messageId,
      sender: 'user',
      type: type,
      content: tempFilePath,
      thumb: thumbPath,
      fileName: fileName,
      fileSize: fileSize,
      extension: extension,
      timestamp: Date.now(),
      status: 'uploading',
      progress: 0
    }
    
    this.addMessageToList(message)
    
    // 模拟上传过程
    let progress = 0
    const uploadInterval = setInterval(() => {
      progress += Math.random() * 20 + 10
      
      if (progress >= 100) {
        progress = 100
        clearInterval(uploadInterval)
        
        setTimeout(() => {
          this.updateMessageStatus(messageId, 'success')
          
          // 清除进度信息
          const { messageList } = this.data
          const index = messageList.findIndex(msg => msg.id === messageId)
          if (index !== -1) {
            delete messageList[index].progress
            this.setData({ messageList })
            
            // 模拟专家回复
            if (type === 'image' || type === 'video') {
              setTimeout(() => {
                this.receiveMediaReply(type)
              }, 800)
            }
          }
        }, 200)
      }
      
      // 更新进度
      const { messageList } = this.data
      const index = messageList.findIndex(msg => msg.id === messageId)
      if (index !== -1) {
        messageList[index].progress = Math.min(progress, 100)
        this.setData({ messageList })
      }
    }, 100)
  },

  // 接收媒体回复
  receiveMediaReply: function(type) {
    const imageReplies = [
      '照片收到了，牛的状况看起来确实不太理想。',
      '从照片看，饲养环境需要改善一下。',
      '图片清晰，我可以更准确地判断问题了。'
    ]
    
    const videoReplies = [
      '视频看到了，动物的精神状态需要关注。',
      '从视频可以观察到更多细节，这很有帮助。',
      '视频内容很有价值，让我了解了具体情况。'
    ]
    
    const replies = type === 'image' ? imageReplies : videoReplies
    const randomReply = replies[Math.floor(Math.random() * replies.length)]
    
    const newMessage = {
      id: 'exp-media-' + Date.now(),
      sender: 'expert',
      type: 'text',
      content: randomReply,
      timestamp: Date.now(),
      showTime: false
    }
    
    this.addMessageToList(newMessage)
  },

  // 开始语音录制
  startVoiceRecord: function(e) {
    this.setData({
      isRecording: true,
      recordingTime: 0,
      recordingTip: '上滑取消录音'
    })
    
    // 开始录音
    this.recordManager.start({
      duration: 60000, // 最长60秒
      sampleRate: 44100,
      numberOfChannels: 1,
      encodeBitRate: 192000,
      format: 'mp3'
    })
    
    // 开始计时
    const timer = setInterval(() => {
      const time = this.data.recordingTime + 1
      this.setData({ recordingTime: time })
    }, 1000)
    
    this.setData({ recordingTimer: timer })
  },

  // 结束语音录制
  endVoiceRecord: function() {
    if (this.data.isRecording) {
      this.recordManager.stop()
      
      if (this.data.recordingTimer) {
        clearInterval(this.data.recordingTimer)
      }
      
      this.setData({
        isRecording: false,
        recordingTime: 0
      })
    }
  },

  // 发送语音消息
  sendAudioMessage: function(tempFilePath, duration) {
    const message = {
      id: 'audio-' + Date.now(),
      sender: 'user',
      type: 'audio',
      content: tempFilePath,
      duration: duration,
      timestamp: Date.now(),
      status: 'sending'
    }
    
    this.addMessageToList(message)
    
    // 模拟发送成功
    setTimeout(() => {
      this.updateMessageStatus(message.id, 'success')
      
      // 模拟专家回复
      setTimeout(() => {
        const reply = {
          id: 'exp-audio-' + Date.now(),
          sender: 'expert',
          type: 'text',
          content: '语音收到了，我会仔细听取分析。',
          timestamp: Date.now(),
          showTime: false
        }
        this.addMessageToList(reply)
      }, 1500)
    }, 800)
  },

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

  // 下载文件
  downloadFile: function(e) {
    const url = e.currentTarget.dataset.url
    wx.showLoading({ title: '下载中...' })
    
    wx.downloadFile({
      url: url,
      success: (res) => {
        wx.hideLoading()
        wx.showToast({
          title: '下载成功',
          icon: 'success'
        })
        
        // 保存到相册（如果是图片）
        if (url.match(/\.(jpg|jpeg|png|gif)$/i)) {
          wx.saveImageToPhotosAlbum({
            filePath: res.tempFilePath,
            success: () => {
              wx.showToast({
                title: '已保存到相册',
                icon: 'success'
              })
            }
          })
        }
      },
      fail: () => {
        wx.hideLoading()
        wx.showToast({
          title: '下载失败',
          icon: 'none'
        })
      }
    })
  },

  // 键盘高度变化
  onKeyboardHeightChange: function(res) {
    if (res.height > 0) {
      // 键盘弹出时隐藏多媒体面板
      this.setData({ showMediaSheet: false })
      
      // 滚动到底部
      setTimeout(() => {
        this.scrollToBottom()
      }, 100)
    }
  },

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

  // 格式化时间（微信样式）
  formatTime: function(timestamp) {
    const now = new Date()
    const date = new Date(timestamp)
    const diff = now - date
    
    // 今天
    if (date.toDateString() === now.toDateString()) {
      return this.formatMessageTime(timestamp)
    }
    
    // 昨天
    const yesterday = new Date(now)
    yesterday.setDate(yesterday.getDate() - 1)
    if (date.toDateString() === yesterday.toDateString()) {
      return '昨天 ' + this.formatMessageTime(timestamp)
    }
    
    // 一周内
    if (diff < 7 * 24 * 60 * 60 * 1000) {
      const weekDays = ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
      return weekDays[date.getDay()] + ' ' + this.formatMessageTime(timestamp)
    }
    
    // 今年内
    if (date.getFullYear() === now.getFullYear()) {
      return `${date.getMonth() + 1}月${date.getDate()}日 ${this.formatMessageTime(timestamp)}`
    }
    
    // 更早
    return `${date.getFullYear()}/${date.getMonth() + 1}/${date.getDate()} ${this.formatMessageTime(timestamp)}`
  },

  // 格式化消息时间（HH:mm）
  formatMessageTime: function(timestamp) {
    const date = new Date(timestamp)
    const hours = date.getHours().toString().padStart(2, '0')
    const minutes = date.getMinutes().toString().padStart(2, '0')
    return `${hours}:${minutes}`
  },

  // 格式化文件大小
  formatFileSize: function(bytes) {
    if (bytes === 0) return '未知大小'
    
    const units = ['B', 'KB', 'MB', 'GB']
    let size = bytes
    let unitIndex = 0
    
    while (size >= 1024 && unitIndex < units.length - 1) {
      size /= 1024
      unitIndex++
    }
    
    return size.toFixed(1) + units[unitIndex]
  },

  // 阻止事件冒泡
  stopPropagation: function() {
    // 空函数，仅用于阻止事件冒泡
  }
})