import { ref, onUnmounted } from 'vue'
import CryptoJS from 'crypto-js'

// 科大讯飞配置（从后端获取）
let XFYUN_CONFIG = {
  APPID: '',
  ACCESS_KEY_ID: '',
  ACCESS_KEY_SECRET: '',
  API_URL: 'wss://office-api-ast-dx.iflyaisol.com/ast/communicate/v1'
}

// 从后端获取配置
const loadConfig = async () => {
  try {
    const token = localStorage.getItem('talk_token')
    const response = await fetch('http://localhost:8080/talk/config/xunfei', {
      headers: {
        'Authorization': token ? `Bearer ${token}` : '',
        'clientid': 'talk-web'
      }
    })
    const config = await response.json()
    XFYUN_CONFIG.APPID = config.appId || ''
    XFYUN_CONFIG.ACCESS_KEY_ID = config.apiKey || ''
    XFYUN_CONFIG.ACCESS_KEY_SECRET = config.apiSecret || ''
  } catch (error) {
    console.error('加载讯飞配置失败:', error)
  }
}

export function useVoiceRecognition() {
  const isRecording = ref(false)
  const currentTranscription = ref('')
  const tempTranscription = ref('')

  let websocket = null
  let mediaRecorder = null
  let audioContext = null
  let sessionId = ''

  // 生成 UUID
  const generateUUID = () => {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      const r = Math.random() * 16 | 0
      const v = c === 'x' ? r : (r & 0x3 | 0x8)
      return v.toString(16)
    })
  }

  // 生成 WebSocket URL
  const getWebSocketUrl = async () => {
    // 确保配置已加载
    if (!XFYUN_CONFIG.APPID) {
      await loadConfig()
    }

    const appId = XFYUN_CONFIG.APPID
    const accessKeyId = XFYUN_CONFIG.ACCESS_KEY_ID
    const accessKeySecret = XFYUN_CONFIG.ACCESS_KEY_SECRET

    const uuid = generateUUID()
    const now = new Date()
    const year = now.getFullYear()
    const month = String(now.getMonth() + 1).padStart(2, '0')
    const day = String(now.getDate()).padStart(2, '0')
    const hour = String(now.getHours()).padStart(2, '0')
    const minute = String(now.getMinutes()).padStart(2, '0')
    const second = String(now.getSeconds()).padStart(2, '0')
    const utc = `${year}-${month}-${day}T${hour}:${minute}:${second}+0800`

    const params = {
      accessKeyId: accessKeyId,
      appId: appId,
      uuid: uuid,
      utc: utc,
      audio_encode: 'pcm_s16le',
      lang: 'autodialect',
      samplerate: '16000'
    }

    const sortedKeys = Object.keys(params).sort()
    const baseString = sortedKeys
      .map(key => `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`)
      .join('&')

    const signatureHash = CryptoJS.HmacSHA1(baseString, accessKeySecret)
    const signature = CryptoJS.enc.Base64.stringify(signatureHash)

    return `${XFYUN_CONFIG.API_URL}?${baseString}&signature=${encodeURIComponent(signature)}`
  }

  // 连接 WebSocket
  const connectWebSocket = async () => {
    return new Promise(async (resolve, reject) => {
      const wsUrl = await getWebSocketUrl()
      console.log('连接 WebSocket:', wsUrl)

      websocket = new WebSocket(wsUrl)

      websocket.onopen = () => {
        console.log('WebSocket 连接成功')
        resolve()
      }

      websocket.onmessage = (event) => {
        try {
          const data = JSON.parse(event.data)
          console.log('收到消息:', data)

          if (data.msg_type === 'action' && data.data && data.data.action === 'started') {
            sessionId = data.data.sessionId || generateUUID()
            console.log('握手成功, sessionId:', sessionId)
            return
          }

          if (data.msg_type === 'error' || data.action === 'error') {
            console.error('转写错误:', data.desc || data.message)
            return
          }

          if (data.msg_type === 'result' && data.res_type === 'asr' && data.data) {
            const result = data.data

            if (result.cn && result.cn.st && result.cn.st.rt) {
              let transcriptText = ''
              result.cn.st.rt.forEach(rt => {
                if (rt.ws) {
                  rt.ws.forEach(ws => {
                    if (ws.cw) {
                      ws.cw.forEach(cw => {
                        transcriptText += cw.w
                      })
                    }
                  })
                }
              })

              if (transcriptText) {
                // 去掉开头的标点符号
                transcriptText = transcriptText.replace(/^[，。！？、；：""''（）《》【】…—\s]+/, '')

                if (transcriptText) {
                  const type = result.cn.st.type
                  if (type === '0') {
                    currentTranscription.value += transcriptText
                    tempTranscription.value = ''
                    console.log('确定性结果:', transcriptText)
                  } else {
                    tempTranscription.value = transcriptText
                    console.log('中间结果:', transcriptText)
                  }
                }
              }
            }
          }
        } catch (error) {
          console.error('解析消息失败:', error)
        }
      }

      websocket.onerror = (error) => {
        console.error('WebSocket 错误:', error)
        reject(error)
      }

      websocket.onclose = () => {
        console.log('WebSocket 关闭')
      }
    })
  }

  // 发送音频数据
  const sendAudioData = (audioData) => {
    if (websocket && websocket.readyState === WebSocket.OPEN) {
      websocket.send(audioData)
    }
  }

  // 关闭 WebSocket
  const closeWebSocket = () => {
    if (websocket && websocket.readyState === WebSocket.OPEN) {
      const endMessage = {
        end: true,
        sessionId: sessionId || generateUUID()
      }
      websocket.send(JSON.stringify(endMessage))

      setTimeout(() => {
        if (websocket) {
          websocket.close()
          websocket = null
        }
      }, 1000)
    }
  }

  // 开始录音
  const startRecording = async () => {
    try {
      const stream = await navigator.mediaDevices.getUserMedia({ audio: true })

      // 连接 WebSocket
      await connectWebSocket()

      // 创建音频上下文
      audioContext = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: 16000 })
      const source = audioContext.createMediaStreamSource(stream)
      const processor = audioContext.createScriptProcessor(4096, 1, 1)

      source.connect(processor)
      processor.connect(audioContext.destination)

      processor.onaudioprocess = (e) => {
        const inputData = e.inputBuffer.getChannelData(0)
        const pcmData = new Int16Array(inputData.length)

        for (let i = 0; i < inputData.length; i++) {
          pcmData[i] = Math.max(-32768, Math.min(32767, inputData[i] * 32768))
        }

        sendAudioData(pcmData.buffer)
      }

      isRecording.value = true
      console.log('开始录音')
    } catch (error) {
      console.error('启动录音失败:', error)
      throw error
    }
  }

  // 停止录音
  const stopRecording = () => {
    if (audioContext) {
      audioContext.close()
      audioContext = null
    }

    closeWebSocket()
    isRecording.value = false
    console.log('停止录音')
  }

  // 清理资源
  onUnmounted(() => {
    if (isRecording.value) {
      stopRecording()
    }
  })

  return {
    isRecording,
    currentTranscription,
    tempTranscription,
    startRecording,
    stopRecording
  }
}