import { ref } from "vue"
import { useChatStore } from "@/stores/chat"
import { useUserStore } from "@/stores/user"
import { callAPI } from "@/utils/request.js"

export function useWebRTC() {
    const localStream = ref(null)
    const remoteStream = ref(null)
    const peerConnection = ref(null)
    const isConnected = ref(false)
    const isConnecting = ref(false)

    const userStore = useUserStore()
    const chatStore = useChatStore()

    const configuration = {
        iceServers: [
            { urls: "stun:stun.l.google.com:19302" },
            { urls: "stun:stun1.l.google.com:19302" }
        ],
        iceTransportPolicy: "all",
        reconnectPolicy: {
            maxAttempts: 3, // 最大重连次数
            delay: 2000     // 重连延迟(ms)
        }
    }

    // 重连相关变量
    let reconnectAttempts = 0
    let reconnectTimer = null
    let currentCallId = null
    let currentPeerId = null

    // 收集ICE候选的队列
    const iceCandidateQueue = ref([])

    // 获取本地媒体流
    const getLocalMedia = async (constraints = { audio: true, video: true }) => {
        try {
            console.log("🎥 开始获取本地媒体流:", constraints)

            // 检测设备可用性
            try {
                const devices = await navigator.mediaDevices.enumerateDevices()
                const hasVideo = devices.some(d => d.kind === 'videoinput' && d.deviceId !== '')
                const hasAudio = devices.some(d => d.kind === 'audioinput' && d.deviceId !== '')

                if (constraints.video && !hasVideo) {
                    console.warn("❌ 摄像头设备不可用")
                    constraints.video = false
                }
                if (constraints.audio && !hasAudio) {
                    console.warn("❌ 麦克风设备不可用")
                    constraints.audio = false
                }
            } catch (deviceError) {
                console.warn("设备检测失败，继续尝试获取媒体:", deviceError)
            }

            // 如果已有流，先停止
            if (localStream.value) {
                localStream.value.getTracks().forEach((track) => track.stop())
                localStream.value = null
            }

            const stream = await navigator.mediaDevices.getUserMedia(constraints)
            localStream.value = stream

            console.log("✅ 本地媒体流获取成功:", {
                streamId: stream.id,
                videoTracks: stream.getVideoTracks().length,
                audioTracks: stream.getAudioTracks().length,
                videoEnabled: stream.getVideoTracks()[0]?.enabled,
                audioEnabled: stream.getAudioTracks()[0]?.enabled,
            })

            return stream
        } catch (error) {
            console.error("❌ 获取本地媒体流失败:", error)

            // 如果视频失败，尝试只获取音频
            if (constraints.video) {
                try {
                    console.log("🎵 尝试仅获取音频流")
                    const audioStream = await navigator.mediaDevices.getUserMedia({ audio: true, video: false })
                    localStream.value = audioStream
                    console.log("✅ 音频流获取成功")
                    return audioStream
                } catch (audioError) {
                    console.error("❌ 音频流也获取失败:", audioError)
                }
            }

            throw error
        }
    }

    // 创建PeerConnection
    const createPeerConnection = (callId, peerId) => {
        console.log("🔗 创建PeerConnection:", { callId, peerId })

        // 保存当前通话信息用于重连
        currentCallId = callId
        currentPeerId = peerId

        if (peerConnection.value) {
            console.log("🔄 关闭现有连接")
            peerConnection.value.close()
        }

        const pc = new RTCPeerConnection(configuration)
        peerConnection.value = pc

        // 处理ICE候选队列
        const processCandidateQueue = async () => {
            console.log(`🔄 处理候选队列 (${iceCandidateQueue.value.length} 项)`)
            while (iceCandidateQueue.value.length > 0) {
                const candidate = iceCandidateQueue.value.shift()
                try {
                    await pc.addIceCandidate(candidate)
                    console.log("✅ 从队列添加ICE候选成功")
                } catch (error) {
                    console.error("❌ 添加队列ICE候选失败:", error)
                }
            }
        }

        // ICE候选事件
        pc.onicecandidate = async (event) => {
            if (event.candidate) {
                console.log("📡 发送ICE候选:", event.candidate)
                try {
                    await callAPI.sendCandidate(userStore.currentUser?.id, peerId, callId, event.candidate, 6)
                } catch (error) {
                    console.error("❌ 发送ICE候选失败:", error)
                }
            } else {
                console.log("❄️ ICE候选收集完成")
            }
        }

        // 接收远程流 - 修复轨道处理逻辑
        pc.ontrack = (event) => {
            console.log("📹 接收到远程轨道:", event.track.kind, "id:", event.track.id)

            // 如果还没有远程流，创建一个新的MediaStream
            if (!remoteStream.value) {
                console.log("🆕 创建新的远程流")
                remoteStream.value = new MediaStream()
            }

            // 确保轨道尚未添加
            const existingTrack = remoteStream.value.getTracks().find(t => t.id === event.track.id)
            if (!existingTrack) {
                remoteStream.value.addTrack(event.track)
                console.log("✅ 添加远程轨道成功，轨道数:", remoteStream.value.getTracks().length)
                console.log("✅ 添加远程轨道成功:", remoteStream.value)
            } else {
                console.log("⏭️ 轨道已存在，跳过添加")
            }
        }

        // 连接状态变化
        pc.onconnectionstatechange = () => {
            const state = pc.connectionState
            console.log("🔗 连接状态:", state)

            if (state === "connected") {
                isConnected.value = true
                isConnecting.value = false
                reconnectAttempts = 0 // 重置重连计数器
                clearTimeout(reconnectTimer)
                if (chatStore.callStatus === "connecting") {
                    chatStore.callStatus = "ongoing"
                    chatStore.callConnectionStatus = "通话已连接"
                }

                // 连接成功后处理候选队列
                processCandidateQueue()
            } else if (state === "connecting") {
                isConnecting.value = true
            } else if (state === "disconnected" || state === "failed") {
                isConnected.value = false
                isConnecting.value = false
            }
        }

        // ICE连接状态变化
        pc.oniceconnectionstatechange = () => {
            const state = pc.iceConnectionState
            console.log("❄️ ICE连接状态:", state)

            if (state === "failed") {
                if (reconnectAttempts < configuration.reconnectPolicy.maxAttempts) {
                    reconnectAttempts++
                    console.warn(`⚠️ 连接失败，尝试重连 (${reconnectAttempts}/${configuration.reconnectPolicy.maxAttempts})`)
                    chatStore.callConnectionStatus = `连接失败，正在尝试重连 (${reconnectAttempts}/${configuration.reconnectPolicy.maxAttempts})`

                    reconnectTimer = setTimeout(() => {
                        restartConnection()
                    }, configuration.reconnectPolicy.delay)
                } else {
                    console.error("❌ 重连次数已达上限，放弃连接")
                    chatStore.callStatus = "disconnected"
                    chatStore.callConnectionStatus = "连接失败，请稍后再试"
                }
            } else if (state === "connected") {
                reconnectAttempts = 0
                clearTimeout(reconnectTimer)
            }
        }

        // ICE收集状态变化
        pc.onicegatheringstatechange = () => {
            console.log("❄️ ICE收集状态:", pc.iceGatheringState)
        }

        // 信令状态变化
        pc.onsignalingstatechange = () => {
            console.log("📶 信令状态:", pc.signalingState)
        }

        // 添加本地流到连接
        if (localStream.value) {
            console.log("➕ 添加本地流到PeerConnection")
            localStream.value.getTracks().forEach((track) => {
                // 确保只添加活跃的轨道
                if (track.readyState === 'live') {
                    pc.addTrack(track, localStream.value)
                    console.log(`✅ 添加 ${track.kind} 轨道到连接`)
                }
            })
        }

        return pc
    }

    // 重启连接
    const restartConnection = () => {
        if (!currentCallId || !currentPeerId) {
            console.error("❌ 无法重启连接: 缺少callId或peerId")
            return
        }

        console.log("🔄 尝试重启WebRTC连接")
        closeConnection()
        createPeerConnection(currentCallId, currentPeerId)

        if (chatStore.isCaller) {
            createOffer(currentCallId, currentPeerId).then(offer => {
                // 重新发送offer逻辑
                callAPI.sendOffer(userStore.currentUser?.id, currentPeerId, currentCallId, offer, 1)
                console.log("📤 重新发送Offer")
            })
        } else {
            // 被叫方请求对方重新发送offer
            console.log("📤 请求对方重新发送Offer")
            callAPI.requestResendOffer(currentCallId, currentPeerId)
        }
    }

    // 创建Offer
    const createOffer = async (callId, peerId) => {
        console.log("📤 创建Offer")

        if (!peerConnection.value) {
            createPeerConnection(callId, peerId)
        }

        try {
            const offer = await peerConnection.value.createOffer()
            await peerConnection.value.setLocalDescription(offer)

            console.log("✅ Offer创建成功:", offer.type)
            console.log("📋 SDP:", offer.sdp.substring(0, 100) + "...")

            return offer
        } catch (error) {
            console.error("❌ 创建Offer失败:", error)
            throw error
        }
    }

    // 创建Answer
    const createAnswer = async (offer, callId, peerId) => {
        console.log("📥 处理Offer并创建Answer")

        if (!peerConnection.value) {
            createPeerConnection(callId, peerId)
        }

        try {
            await peerConnection.value.setRemoteDescription(offer)
            const answer = await peerConnection.value.createAnswer()
            await peerConnection.value.setLocalDescription(answer)

            console.log("✅ Answer创建成功:", answer.type)
            console.log("📋 SDP:", answer.sdp.substring(0, 100) + "...")

            return answer
        } catch (error) {
            console.error("❌ 创建Answer失败:", error)
            throw error
        }
    }

    // 设置远程Answer
    const setRemoteAnswer = async (answer) => {
        console.log("📥 设置远程Answer")
        try {
            await peerConnection.value.setRemoteDescription(answer)
            console.log("✅ 远程Answer设置成功")
        } catch (error) {
            console.error("❌ 设置远程Answer失败:", error)
            throw error
        }
    }

    // 添加ICE候选
    const addIceCandidate = async (candidate) => {
        if (!peerConnection.value) {
            console.log("⏳ 连接尚未建立，将候选加入队列")
            iceCandidateQueue.value.push(candidate)
            return
        }

        if (peerConnection.value.remoteDescription) {
            try {
                await peerConnection.value.addIceCandidate(candidate)
                console.log("✅ ICE候选添加成功")
            } catch (error) {
                console.error("❌ 添加ICE候选失败:", error)
            }
        } else {
            console.log("⏳ 等待远程描述，将候选加入队列")
            iceCandidateQueue.value.push(candidate)
        }
    }

    // 切换摄像头
    const toggleCamera = async (enable) => {
        if (!localStream.value) return

        const videoTrack = localStream.value.getVideoTracks()[0]
        if (videoTrack) {
            videoTrack.enabled = enable
            console.log("📹 摄像头状态:", enable ? "开启" : "关闭")
        }
    }

    // 切换麦克风
    const toggleMicrophone = async (enable) => {
        if (!localStream.value) return

        const audioTrack = localStream.value.getAudioTracks()[0]
        if (audioTrack) {
            audioTrack.enabled = enable
            console.log("🎤 麦克风状态:", enable ? "开启" : "关闭")
        }
    }

    // 关闭连接 - 彻底释放资源
    const closeConnection = () => {
        console.log("🔄 关闭WebRTC连接")

        // 停止所有媒体轨道并释放设备
        if (localStream.value) {
            console.log("📹 停止本地流轨道")
            localStream.value.getTracks().forEach(track => {
                console.log(`⏹ 停止轨道: ${track.kind} (${track.id})`)
                track.stop() // 停止轨道以释放设备
                track.enabled = false
            })
            localStream.value = null
        }

        // 清除远程流
        if (remoteStream.value) {
            console.log("📹 清除远程流")
            remoteStream.value.getTracks().forEach(track => {
                console.log(`⏹ 停止远程轨道: ${track.kind} (${track.id})`)
                track.stop()
            })
            remoteStream.value = null
        }

        // 关闭对等连接
        if (peerConnection.value) {
            console.log("🔌 关闭对等连接")
            peerConnection.value.close()
            peerConnection.value = null
        }

        // 清理重连计时器
        if (reconnectTimer) {
            console.log("⏲ 清除重连计时器")
            clearTimeout(reconnectTimer)
            reconnectTimer = null
        }

        // 重置状态
        isConnected.value = false
        isConnecting.value = false
        reconnectAttempts = 0
        currentCallId = null
        currentPeerId = null

        // 清空候选队列
        iceCandidateQueue.value = []
    }

    return {
        localStream,
        remoteStream,
        peerConnection,
        isConnected,
        isConnecting,
        getLocalMedia,
        createPeerConnection,
        createOffer,
        createAnswer,
        setRemoteAnswer,
        addIceCandidate,
        toggleCamera,
        toggleMicrophone,
        closeConnection,
    }
}