import { defineStore } from "pinia"
import { ref, computed } from "vue"
import { chatDB } from "@/utils/db"
import { useWebRTC } from "@/composables/useWebRTC"
import { useUserStore } from "@/stores/user"
import { sendMessage } from "@/utils/request.js"

export const useChatStore = defineStore("chat", () => {
  const friends = ref([])
  const currentFriend = ref(null)
  const messages = ref([])
  const connectionStatus = ref("disconnected")
  const socket = ref(null)

  // 通话相关状态
  const currentCall = ref(null)
  const incomingCall = ref(null)
  const callStatus = ref("idle") // idle, calling, ringing, ongoing, ended
  const callError = ref(null) // 错误状态：'rejected', 'no-answer', 'busy'
  const callConnectionStatus = ref("") // 连接状态：等待接听、正在连接等

  const webrtc = useWebRTC()
  const userStore = useUserStore()

  // 计算属性
  const isConnected = computed(() => connectionStatus.value === "connected")
  const isInCall = computed(() => callStatus.value !== "idle")
  const isCalling = computed(() => callStatus.value === "calling")
  const isRinging = computed(() => callStatus.value === "ringing")
  const isOngoingCall = computed(() => callStatus.value === "ongoing")

  // 初始化数据库
  const initDB = async () => {
    try {
      await chatDB.init()
      console.log("数据库初始化成功")
    } catch (error) {
      console.error("数据库初始化失败:", error)
    }
  }

  // 加载好友列表
  const loadFriends = async (presetUsers, currentUserId) => {
    try {
      // 从数据库获取好友列表
      let friendList = await chatDB.getFriends(currentUserId)

      // 如果数据库中没有好友，使用预设用户初始化
      if (friendList.length === 0) {
        friendList = presetUsers.filter((user) => user.id !== currentUserId)

        // 保存到数据库
        for (const friend of friendList) {
          await chatDB.saveFriend(
              {
                ...friend,
                lastMessage: "",
                unreadCount: 0,
              },
              currentUserId
          )
        }
      }

      friends.value = friendList
    } catch (error) {
      console.error("加载好友列表失败:", error)
      // 降级到预设用户
      const friendList = presetUsers.filter((user) => user.id !== currentUserId)
      friendList.forEach((friend) => {
        friend.lastMessage = ""
        friend.unreadCount = 0
      })
      friends.value = friendList
    }
  }

  // 设置当前好友
  const setCurrentFriend = (friend) => {
    currentFriend.value = friend
    // 清除未读消息计数
    if (friend) {
      friend.unreadCount = 0
    }
  }

  // 切换当前聊天好友
  const switchFriend = async (friend, currentUserId) => {
    currentFriend.value = friend

    // 清空未读消息计数
    friend.unreadCount = 0
    await chatDB.clearUnreadCount(friend.id)

    // 加载聊天记录
    try {
      const chatHistory = await chatDB.getChatHistory(currentUserId, friend.id)
      messages.value = chatHistory.sort((a, b) => a.timestamp - b.timestamp)
    } catch (error) {
      console.error("加载聊天记录失败:", error)
      messages.value = []
    }
  }

  // 添加消息
  const addMessage = async (message, currentUserId) => {
    messages.value.push(message)

    if (currentFriend.value) {
      try {
        // 保存到数据库
        await chatDB.saveMessage(message, currentUserId, currentFriend.value.id)

        // 更新好友列表中的最后消息
        const friend = friends.value.find((f) => f.id === currentFriend.value.id)
        if (friend) {
          let lastMessage = message.content
          if (message.type === "image") lastMessage = "[图片]"
          if (message.type === "video") lastMessage = "[视频]"
          if (message.type === "audio") lastMessage = "[语音]"

          friend.lastMessage = lastMessage.length > 20 ? lastMessage.substring(0, 20) + "..." : lastMessage

          // 更新数据库中的好友信息
          await chatDB.updateFriendLastMessage(friend.id, currentUserId, friend.lastMessage, 0)
        }
      } catch (error) {
        console.error("保存消息失败:", error)
      }
    }
  }

  // 处理接收到的消息
  const handleIncomingMessage = async (messageData, currentUserId) => {
    // 添加来源检查 - 防止循环
    if (messageData.isFromHttp) {
      console.log("忽略来自HTTP的消息，避免循环")
      return
    }

    const senderId = messageData.sender_user_id
    const receiverId = messageData.receiver_user_id

    if (receiverId !== currentUserId) return

    // 如果是通话信令，直接处理
    if (messageData.call_id || messageData.call_status) {
      handleCallSignal(messageData)
      return
    }

    const newMessage = {
      type: getMessageType(messageData.message_type),
      content: messageData.content,
      time: new Date().toLocaleTimeString().slice(0, 5),
      senderId: senderId,
      read: false,
      duration: messageData.duration || 0,
      timestamp: Date.now(),
    }

    try {
      // 保存消息到数据库
      await chatDB.saveMessage(newMessage, currentUserId, senderId)

      // 如果消息来自当前聊天用户，直接显示
      if (currentFriend.value && senderId == currentFriend.value.id) {
        newMessage.read = true
        messages.value.push(newMessage)
      } else {
        // 更新未读消息计数
        const friend = friends.value.find((f) => f.id == senderId)
        if (friend) {
          friend.unreadCount = (friend.unreadCount || 0) + 1

          // 更新最后消息
          let lastMessage = newMessage.content
          if (newMessage.type === "image") lastMessage = "[图片]"
          if (newMessage.type === "video") lastMessage = "[视频]"
          if (newMessage.type === "audio") lastMessage = "[语音]"
          friend.lastMessage = lastMessage

          // 更新数据库
          await chatDB.updateFriendLastMessage(friend.id, currentUserId, lastMessage, friend.unreadCount)
        }
      }
    } catch (error) {
      console.error("处理接收消息失败:", error)
    }
  }

  // 根据消息类型编号获取类型字符串
  const getMessageType = (type) => {
    const types = [
      "text", "image", "audio", "video",
      "prescription", "medical-record",
      "video-call", "audio-call", "file"
    ]
    return types[type] || "text"
  }

  // 处理通话信令
  const handleCallSignal = (data) => {
    console.log("处理通话信令:", data)

    // 根据通话状态处理
    switch (data.call_status) {
      case "invite":
        handleIncomingCall(data)
        break
      case "accepted":
        handleCallAccepted(data)
        break
      case "rejected":
        handleCallRejected(data)
        break
      case "ended":
        handleCallEnded(data)
        break
      case "candidate":
        handleIceCandidate(data)
        break
      case "no-answer": // 添加无人接听状态
        handleCallNoAnswer(data)
        break
      case "connecting": // 新增连接状态
        callConnectionStatus.value = "正在连接..."
        break
      case "busy": // 对方忙线中
        handleCallBusy(data)
        break
    }
  }

  // 处理来电
  const handleIncomingCall = (data) => {
    // 如果自己正在通话中，自动拒绝并发送忙线状态
    if (isInCall.value) {
      sendMessage({
        senderId: userStore.currentUser?.id,
        receiverId: data.sender_user_id,
        type: data.message_type === 6 ? "video-call" : "audio-call",
        callId: data.call_id,
        callStatus: "busy"
      })

      // 添加未接来电消息
      const friend = friends.value.find(f => f.id === data.sender_user_id)
      if (friend) {
        friend.lastMessage = "[未接来电]"
        chatDB.updateFriendLastMessage(friend.id, userStore.currentUser.id, "[未接来电]", friend.unreadCount)
      }

      return
    }

    incomingCall.value = {
      callId: data.call_id,
      callerId: data.sender_user_id,
      callType: data.message_type === 6 ? "video" : "audio",
      content: data.content
    }
    callStatus.value = "ringing"
    callError.value = null
    callConnectionStatus.value = "收到来电"

    console.log("收到来电:", incomingCall.value)
  }

  // 处理通话接受
  const handleCallAccepted = (data) => {
    if (currentCall.value && currentCall.value.callId === data.call_id) {
      callStatus.value = "ongoing"
      callError.value = null
      callConnectionStatus.value = "通话中"
      console.log("通话已被接受")
    }
  }

  // 处理通话拒绝
  const handleCallRejected = (data) => {
    if (currentCall.value && currentCall.value.callId === data.call_id) {
      callStatus.value = "ended"
      callError.value = "rejected"
      callConnectionStatus.value = "对方已拒绝"
      currentCall.value = null
      console.log("通话已被拒绝")

      // 5秒后清除状态
      setTimeout(() => {
        callStatus.value = "idle"
        callError.value = null
        callConnectionStatus.value = ""
      }, 5000)
    }
  }

  // 处理通话结束
  const handleCallEnded = (data) => {
    if ((currentCall.value && currentCall.value.callId === data.call_id) ||
        (incomingCall.value && incomingCall.value.callId === data.call_id)) {
      callStatus.value = "ended"
      callError.value = null
      callConnectionStatus.value = "通话已结束"
      currentCall.value = null
      incomingCall.value = null
      console.log("通话已结束")

      // 5秒后清除状态
      setTimeout(() => {
        callStatus.value = "idle"
        callConnectionStatus.value = ""
      }, 5000)
    }
  }

  // 处理ICE候选
  const handleIceCandidate = (data) => {
    if (currentCall.value && currentCall.value.callId === data.call_id) {
      console.log("收到ICE候选:", data.content)
      // 这里可以添加WebRTC处理逻辑
    }
  }

  // 处理无人接听
  const handleCallNoAnswer = (data) => {
    if (currentCall.value && currentCall.value.callId === data.call_id) {
      callStatus.value = "ended"
      callError.value = "no-answer"
      callConnectionStatus.value = "对方无人接听"
      currentCall.value = null
      console.log("对方无人接听")

      // 5秒后清除状态
      setTimeout(() => {
        callStatus.value = "idle"
        callError.value = null
        callConnectionStatus.value = ""
      }, 5000)
    }
  }

  // 处理对方忙线
  const handleCallBusy = (data) => {
    if (currentCall.value && currentCall.value.callId === data.call_id) {
      callStatus.value = "ended"
      callError.value = "busy"
      callConnectionStatus.value = "对方忙线中"
      currentCall.value = null
      console.log("对方忙线中")

      // 5秒后清除状态
      setTimeout(() => {
        callStatus.value = "idle"
        callError.value = null
        callConnectionStatus.value = ""
      }, 5000)
    }
  }

  // 发起通话
  const startCall = (peerId, type) => {
    if (isInCall.value) {
      alert('您正在通话中，请先结束当前通话。')
      return
    }

    const friend = friends.value.find(f => f.id === peerId)
    if (!friend) {
      alert('好友信息无效')
      return
    }

    const callId = Date.now().toString() + Math.random().toString(36).substr(2, 9)

    currentCall.value = {
      callId: callId,
      peerId: peerId,
      callType: type,
      startTime: Date.now(),
      status: 'calling'
    }

    callStatus.value = "calling"
    callError.value = null
    callConnectionStatus.value = "等待对方接听..."

    // 设置30秒超时（无人接听）
    const timeoutId = setTimeout(() => {
      if (callStatus.value === "calling") {
        callStatus.value = "ended"
        callError.value = "no-answer"
        callConnectionStatus.value = "对方无人接听"
        console.log("呼叫超时，对方无人接听")

        // 发送无人接听信号
        sendMessage({
          senderId: userStore.currentUser?.id,
          receiverId: peerId,
          type: type === "video" ? "video-call" : "audio-call",
          callId: callId,
          callStatus: "no-answer"
        })

        // 更新好友最后消息为未接来电
        friend.lastMessage = "[未接来电]"
        chatDB.updateFriendLastMessage(friend.id, userStore.currentUser.id, "[未接来电]", friend.unreadCount)

        // 5秒后清除状态
        setTimeout(() => {
          callStatus.value = "idle"
          currentCall.value = null
          callConnectionStatus.value = ""
        }, 5000)
      }
    }, 30000)

    currentCall.value.timeoutId = timeoutId

    // 发送通话请求
    sendMessage({
      senderId: userStore.currentUser?.id,
      receiverId: peerId,
      type: type === "video" ? "video-call" : "audio-call",
      callId: callId,
      callStatus: "invite"
    })

    console.log("发起通话:", currentCall.value)
  }

  // 接听来电
  const acceptCall = () => {
    if (!incomingCall.value) return

    // 清除可能存在的超时计时器
    if (currentCall.value?.timeoutId) {
      clearTimeout(currentCall.value.timeoutId)
    }

    // 发送接受信号
    sendMessage({
      senderId: userStore.currentUser?.id,
      receiverId: incomingCall.value.callerId,
      type: incomingCall.value.callType === "video" ? "video-call" : "audio-call",
      callId: incomingCall.value.callId,
      callStatus: "accepted"
    })

    currentCall.value = {
      callId: incomingCall.value.callId,
      peerId: incomingCall.value.callerId,
      callType: incomingCall.value.callType,
      startTime: Date.now(),
      status: 'ongoing'
    }

    callStatus.value = "ongoing"
    callConnectionStatus.value = "通话中"
    incomingCall.value = null
    callError.value = null
    console.log("接听通话")
  }

  // 拒绝来电
  const rejectCall = () => {
    if (!incomingCall.value) return

    // 发送拒绝信号
    sendMessage({
      senderId: userStore.currentUser?.id,
      receiverId: incomingCall.value.callerId,
      type: incomingCall.value.callType === "video" ? "video-call" : "audio-call",
      callId: incomingCall.value.callId,
      callStatus: "rejected"
    })

    callStatus.value = "ended"
    callConnectionStatus.value = "已拒绝"
    callError.value = "rejected"

    // 更新好友最后消息为已拒绝
    const friend = friends.value.find(f => f.id === incomingCall.value.callerId)
    if (friend) {
      friend.lastMessage = "[已拒绝]"
      chatDB.updateFriendLastMessage(friend.id, userStore.currentUser.id, "[已拒绝]", friend.unreadCount)
    }

    incomingCall.value = null

    // 5秒后清除状态
    setTimeout(() => {
      callStatus.value = "idle"
      callError.value = null
      callConnectionStatus.value = ""
    }, 5000)

    console.log("拒绝通话")
  }

  // 结束通话
  const endCall = () => {
    const callId = currentCall.value?.callId || incomingCall.value?.callId
    const peerId = currentCall.value?.peerId || incomingCall.value?.callerId
    const callTypeVal = currentCall.value?.callType || incomingCall.value?.callType

    if (!callId || !peerId) return

    // 清除超时计时器
    if (currentCall.value?.timeoutId) {
      clearTimeout(currentCall.value.timeoutId)
    }

    // 发送结束信号
    sendMessage({
      senderId: userStore.currentUser?.id,
      receiverId: peerId,
      type: callTypeVal === "video" ? "video-call" : "audio-call",
      callId: callId,
      callStatus: "ended"
    })

    callStatus.value = "ended"
    callConnectionStatus.value = "通话结束"
    // 5秒后清除状态
    setTimeout(() => {
      callStatus.value = "idle"
      currentCall.value = null
      incomingCall.value = null
      callError.value = null
      callConnectionStatus.value = ""
    }, 5000)

    console.log("结束通话")
  }

  return {
    friends,
    currentFriend,
    messages,
    connectionStatus,
    socket,
    currentCall,
    incomingCall,
    callStatus,
    callError,
    callConnectionStatus,
    isConnected,
    isInCall,
    isCalling,
    isRinging,
    isOngoingCall,
    initDB,
    loadFriends,
    setCurrentFriend,
    switchFriend,
    addMessage,
    handleIncomingMessage,
    handleCallSignal,
    startCall,
    acceptCall,
    rejectCall,
    endCall
  }
})