import { reactive, shallowRef, ref } from 'vue'
import * as systemApi from '@/api/modules/system'
import * as messageApi from '@/api/modules/message'
import { wsManager } from '@/api/websocket'
import { useToastStore } from '@/stores/toast'
import { useChatStore } from '@/stores/chat'
import type { ChatMessage } from '@/types/api'
import type { CallStatus } from '@/types/message'

export interface CallState {
  active: boolean
  minimized: boolean
  type: 'audio' | 'video'
  status: 'idle' | 'outgoing' | 'incoming' | 'connected'
  statusText: string
  id: string | null
  muted: boolean
  camOff: boolean
  remoteCamOff: boolean // 新增：对方是否关闭摄像头
  duration: number
  startTime: number | null
}

// 铃声资源 (使用在线资源作为示例)
const RINGTONE_INCOMING = 'https://assets.mixkit.co/active_storage/sfx/2860/2860-64-bit.mp3' // 电话铃声
const RINGTONE_DIALING = 'https://assets.mixkit.co/active_storage/sfx/2864/2864-64-bit.mp3' // 嘟嘟声

export function useWebRTC(userId: string, onIncomingCall?: (senderUserId: string) => void) {
  const toastStore = useToastStore()
  const chatStore = useChatStore()

  const call = reactive<CallState>({
    active: false,
    minimized: false,
    type: 'video',
    status: 'idle',
    statusText: '',
    id: null,
    muted: false,
    camOff: false,
    remoteCamOff: false,
    duration: 0,
    startTime: null,
  })

  const isCaller = ref(false)
  const localStream = shallowRef<MediaStream | null>(null)
  const remoteStream = shallowRef<MediaStream | null>(null)
  let durationTimer: number | null = null
  let pc: RTCPeerConnection | null = null
  const pendingCandidates: RTCIceCandidate[] = []
  let currentReceiverUserId = ''

  // 音频对象
  const audioIncoming = new Audio(RINGTONE_INCOMING)
  const audioDialing = new Audio(RINGTONE_DIALING)
  audioIncoming.loop = true
  audioDialing.loop = true

  // --- 铃声控制 ---
  function playRingtone(type: 'incoming' | 'dialing') {
    stopRingtone() // 先停止当前的
    const audio = type === 'incoming' ? audioIncoming : audioDialing
    audio.currentTime = 0
    audio.play().catch(e => console.warn('Autoplay prevented:', e))
  }

  function stopRingtone() {
    audioIncoming.pause()
    audioDialing.pause()
    audioIncoming.currentTime = 0
    audioDialing.currentTime = 0
  }

  // --- 系统通知 ---
  function sendSystemNotification(title: string, body: string) {
    if (!('Notification' in window)) return

    if (Notification.permission === 'granted') {
      new Notification(title, { body, icon: '/favicon.ico' })
    } else if (Notification.permission !== 'denied') {
      Notification.requestPermission().then(permission => {
        if (permission === 'granted') {
          new Notification(title, { body, icon: '/favicon.ico' })
        }
      })
    }
  }

  // --- 辅助函数 ---
  function getRoomId(uid1: string, uid2: string): string {
    return [uid1, uid2].sort().join('_')
  }

  function formatTextDuration(seconds: number): string {
    if (seconds <= 0) return '0秒'
    const h = Math.floor(seconds / 3600)
    const m = Math.floor((seconds % 3600) / 60)
    const s = seconds % 60
    let str = ''
    if (h > 0) str += `${h}小时`
    if (m > 0) str += `${m}分钟`
    if (s > 0) str += `${s}秒`
    return str
  }

  async function sendSummaryMessage(reason: 'connected' | 'cancelled' | 'rejected' | 'busy') {
    if (!isCaller.value || !currentReceiverUserId) return
    let content = ''
    const durationStr = formatTextDuration(call.duration)
    const isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
    const deviceText = isMobile ? '移动端' : '电脑端'

    if (reason === 'connected') content = `通话结束，时长：${durationStr}`
    else if (reason === 'cancelled') content = '已取消呼叫'
    else if (reason === 'rejected') content = '对方拒绝接听'
    else if (reason === 'busy') content = '对方忙'

    content += ` [${deviceText}]`

    const roomId = getRoomId(userId, currentReceiverUserId)
    const clientId = wsManager.getClientId()
    const payload = {
      sender_client_id: clientId || '',
      receiver_user_id: currentReceiverUserId,
      room_id: roomId,
      message_type: 0,
      content: content,
      duration: 0,
      extra: JSON.stringify({ isSystem: true }),
    }

    try {
      await messageApi.sendMessage(payload)
      const localMsg: any = {
        ...payload, id: Date.now(), sender_user_id: userId, created_at: new Date().toISOString(), isSelf: true, extra: { isSystem: true }
      }
      chatStore.addMessage(roomId, localMsg)
      chatStore.updateContactLastMsg(currentReceiverUserId, content, Date.now())
    } catch (e) { console.error(e) }
  }

  // --- WebRTC 基础 ---
  async function initMedia(videoEnabled: boolean): Promise<void> {
    try {
      if (localStream.value) localStream.value.getTracks().forEach(t => t.stop())
      const constraints: MediaStreamConstraints = {
        video: videoEnabled ? { width: { ideal: 1280 }, height: { ideal: 720 }, facingMode: 'user' } : false,
        audio: { echoCancellation: true, noiseSuppression: true, autoGainControl: true },
      }
      const stream = await navigator.mediaDevices.getUserMedia(constraints)
      localStream.value = stream
    } catch (error) { throw new Error('无法获取设备权限') }
  }

  async function createPC(): Promise<void> {
    const servers = [{ urls: 'stun:stun.l.google.com:19302' }]
    if (pc) pc.close()
    pc = new RTCPeerConnection({ iceServers: servers })
    if (localStream.value) localStream.value.getTracks().forEach((track) => pc!.addTrack(track, localStream.value!))
    pc.ontrack = (e) => { if (e.streams && e.streams[0]) remoteStream.value = e.streams[0] }
    pc.onicecandidate = (e) => { if (e.candidate && call.id) sendSignal('candidate', e.candidate) }
  }

  function sendSignal(status: CallStatus, data?: any, receiverUserId?: string) {
    if (!call.id) return
    const targetUserId = receiverUserId || currentReceiverUserId
    if (!targetUserId) return
    const payload = {
      sender_client_id: wsManager.getClientId() || '',
      receiver_user_id: targetUserId,
      room_id: '',
      message_type: 6,
      content: JSON.stringify(data || {}),
      call_id: call.id,
      call_status: status,
      extra: JSON.stringify({ type: call.type }),
    }
    messageApi.sendMessage(payload).catch(console.error)
  }

  // --- 摄像头开关同步信令 ---
  function sendSyncState(type: 'cam-toggle', value: boolean) {
    if (call.status !== 'connected') return
    const payload = {
      sender_client_id: wsManager.getClientId() || '',
      receiver_user_id: currentReceiverUserId,
      room_id: '',
      message_type: 6, // 借用信令通道
      content: JSON.stringify({ action: type, value }),
      call_id: call.id,
      call_status: 'sync_state' as any, // 自定义状态
      extra: JSON.stringify({ type: call.type })
    }
    messageApi.sendMessage(payload).catch(console.error)
  }

  // --- 计时器 ---
  function startCallTimer() {
    stopCallTimer()
    call.startTime = Date.now()
    call.duration = 0
    durationTimer = window.setInterval(() => {
      if (call.startTime) call.duration = Math.floor((Date.now() - call.startTime) / 1000)
    }, 1000)
  }

  function stopCallTimer() {
    if (durationTimer) { clearInterval(durationTimer); durationTimer = null }
    call.startTime = null
    call.duration = 0
  }

  function formatDuration(seconds: number): string {
    const m = Math.floor(seconds / 60).toString().padStart(2, '0')
    const s = (seconds % 60).toString().padStart(2, '0')
    const h = Math.floor(seconds / 3600)
    return h > 0 ? `${h.toString().padStart(2, '0')}:${m}:${s}` : `${m}:${s}`
  }

  // --- 操作 ---
  async function startCall(type: 'audio' | 'video', receiverUserId: string) {
    isCaller.value = true
    currentReceiverUserId = receiverUserId
    call.type = type
    call.id = Date.now().toString()
    call.active = true
    call.minimized = false
    call.status = 'outgoing'
    call.statusText = '正在呼叫...'
    call.duration = 0
    call.camOff = false
    call.remoteCamOff = false
    remoteStream.value = null

    try {
      await initMedia(type === 'video')
      await createPC()
      playRingtone('dialing') // 播放拨号音
      sendSignal('invite', undefined, receiverUserId)
    } catch (error: any) {
      toastStore.error(error.message || '无法启动通话')
      closeCall()
    }
  }

  async function acceptCall(senderUserId?: string) {
    isCaller.value = false
    stopRingtone() // 停止来电铃声
    if (senderUserId) currentReceiverUserId = senderUserId
    call.status = 'connected'
    call.statusText = '正在连接...'
    call.camOff = false
    call.remoteCamOff = false

    try {
      await initMedia(call.type === 'video')
      await createPC()
      sendSignal('accepted', undefined, currentReceiverUserId)
    } catch (error) {
      endCall()
    }
  }

  function endCall() {
    stopRingtone()
    if (isCaller.value) {
      if (call.status === 'connected') sendSummaryMessage('connected')
      else if (call.status === 'outgoing') sendSummaryMessage('cancelled')
    }
    sendSignal('hangup')
    closeCall()
  }

  function closeCall() {
    stopRingtone()
    call.active = false
    call.status = 'idle'
    call.statusText = ''
    call.id = null
    stopCallTimer()
    if (pc) { pc.close(); pc = null }
    if (localStream.value) { localStream.value.getTracks().forEach(t => t.stop()); localStream.value = null }
    remoteStream.value = null
  }

  async function handleSignaling(message: ChatMessage) {
    const signal = message.call_status as any
    const content = message.content ? JSON.parse(message.content) : {}
    const extra = message.extra ? (typeof message.extra === 'string' ? JSON.parse(message.extra) : message.extra) : {}

    if (extra.type) call.type = extra.type

    // 处理自定义状态同步信令
    if (signal === 'sync_state') {
      if (content.action === 'cam-toggle') {
        call.remoteCamOff = content.value
      }
      return
    }

    if (signal === 'invite') {
      isCaller.value = false
      currentReceiverUserId = message.sender_user_id
      call.id = message.call_id
      call.active = true
      call.minimized = false
      call.status = 'incoming'
      call.statusText = `邀请你进行${call.type === 'video' ? '视频' : '语音'}通话`
      call.remoteCamOff = false

      playRingtone('incoming') // 播放来电铃声
      sendSystemNotification('新来电', `收到来自 ${message.sender_user_id} 的${call.type === 'video' ? '视频' : '语音'}通话邀请`) // 触发系统通知

      if (onIncomingCall) onIncomingCall(message.sender_user_id)

    } else if (signal === 'accepted') {
      stopRingtone() // 对方接听，停止拨号音
      call.status = 'connected'
      call.statusText = '通话中'
      startCallTimer()
      const offer = await pc!.createOffer()
      await pc!.setLocalDescription(offer)
      sendSignal('offer', offer)

    } else if (signal === 'offer') {
      stopRingtone() // 建立连接，停止可能存在的铃声
      if (!pc) {
        await initMedia(call.type === 'video')
        await createPC()
      }
      await pc!.setRemoteDescription(content)
      processPendingCandidates()
      const answer = await pc!.createAnswer()
      await pc!.setLocalDescription(answer)
      sendSignal('answer', answer, message.sender_user_id)
      call.status = 'connected'
      call.statusText = '通话中'
      startCallTimer()

    } else if (signal === 'answer') {
      await pc!.setRemoteDescription(content)
      processPendingCandidates()

    } else if (signal === 'candidate') {
      if (pc && pc.remoteDescription) await pc.addIceCandidate(content)
      else pendingCandidates.push(content)

    } else if (['hangup', 'ended', 'answered_elsewhere'].includes(signal)) {
      if (isCaller.value) {
        if (call.status === 'outgoing') sendSummaryMessage('rejected')
        else if (call.status === 'connected') sendSummaryMessage('connected')
      }
      closeCall()
      if (signal === 'answered_elsewhere') toastStore.info('已在其他设备接听')
    }
  }

  async function processPendingCandidates() {
    while (pendingCandidates.length > 0) {
      const c = pendingCandidates.shift()
      if (c && pc) await pc.addIceCandidate(c)
    }
  }

  function toggleMute() {
    call.muted = !call.muted
    if (localStream.value) localStream.value.getAudioTracks().forEach(t => t.enabled = !call.muted)
  }

  function toggleCamera() {
    call.camOff = !call.camOff
    // 同步状态给对方
    sendSyncState('cam-toggle', call.camOff)
    if (localStream.value) localStream.value.getVideoTracks().forEach(t => t.enabled = !call.camOff)
  }

  return {
    call, localStream, remoteStream, startCall, acceptCall, endCall, handleSignaling, toggleMute, toggleCamera, formatDuration, sendSystemNotification
  }
}