import 'dart:async';
import 'dart:typed_data';

import 'package:demo001/xunfei/xunfei.dart';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_sound/flutter_sound.dart';
import 'package:audioplayers/audioplayers.dart';
import 'package:permission_handler/permission_handler.dart';

class SoundRecordScene extends StatefulWidget {
  @override
  _SoundRecordSceneState createState() => _SoundRecordSceneState();
}

class _SoundRecordSceneState extends State<SoundRecordScene> {
  late ISDK _sdk;
  FlutterSoundRecorder? _soundRecorder;
  AudioPlayer? _audioPlayer;
  bool _isRecorderReady = false;
  bool _isRecording = false;
  bool _isSpeaking = false; //是否说话
  int _stateSpeak = 0; // 说话状态 0 未说话 1开始说话 2 说话中 3结束说话
  String? _audioFilePath;
  double _volumeLevel = 0.0; // 当前音量值
  DateTime? _lastBelowThresholdTime; // 上次音量低于阈值的时间
  ScrollController _scrollController = ScrollController();
  List<String> _logs = [];
  List<ITaskTrans> _trans = [];
  late ITaskTrans _lasttran;
  // 音量阈值
  final double _speakingThreshold = 50.0; // 开始说话的阈值
  final double _silenceThreshold = 30.0; // 结束说话的阈值
  final Duration _silenceDuration = Duration(seconds: 1); // 持续低于阈值的时间

  // 采样率和声道数
  Codec _audiocodec = Codec.pcm16;
  final int _sampleRate = 16000; // 16kHz 采样率
  final int _numChannels = 1; // 单声道
  StreamController<Uint8List> _audioDataStreamController = StreamController<Uint8List>.broadcast();
  //暴露音频数据流
  Stream<Uint8List> get audioDataStream => _audioDataStreamController.stream;
  @override
  void initState() {
    super.initState();
    _sdk =  Xunfei( 
      appId: "137dc132",
      apiKey: "1c1891a475e71250ecd1320303ad6545",
      apiSecret: "MjZhNDA1NTI1NWZkZDQxOTMxYzMyN2Yw");
    _audioPlayer = AudioPlayer();
    _requestPermissions();
    _initRecorder();
  }

  // 初始化录音器
  void _initRecorder() async {
    try {
       _soundRecorder = FlutterSoundRecorder();
      await _soundRecorder?.openRecorder();
      await _soundRecorder?.setSubscriptionDuration(const Duration(milliseconds: 100));
      //检查编解码器是否支持
      if (!await _soundRecorder!.isEncoderSupported(Codec.pcm16)) {
        _log("PCM16 codec is not supported on this device.");
        _audiocodec = Codec.aacADTS;
      }
      setState(() {
        _isRecorderReady = true;
      });
      _log('录音器初始化成功');
    } catch (e) {
      _log('初始化录音器失败: $e');
      setState(() {
        _isRecorderReady = false;
      });
    }
  }

  // 请求麦克风权限
  void _requestPermissions() async {
    try {
      if (await Permission.microphone.request().isGranted) {
        _log('麦克风权限已授予');
      } else {
        _log('麦克风权限被拒绝');
        setState(() {
          _isRecorderReady = false;
        });
      }
    } catch (e) {
      _log('请求麦克风权限失败: $e');
      setState(() {
        _isRecorderReady = false;
      });
    }
  }

  // 开始录音
  void _startRecording() async {
    try {
      if (!_isRecorderReady) {
        _log('录音器未准备好');
        return;
      }
      if (_isRecording) return; // 防止重复调用
      final directory = await getTemporaryDirectory();
      final tempPath = '${directory.path}/recorded_audio.pcm';
      _log('录音文件路径: $tempPath');
      await _soundRecorder?.startRecorder(
        codec: _audiocodec,
        toStream: _audioDataStreamController.sink, // 将音频数据写入到 StreamController
        sampleRate: _sampleRate, // 设置采样率
        numChannels: _numChannels, // 设置声道数
        enableVoiceProcessing: true, // 启用音量监听
      );
      _soundRecorder?.onProgress!.listen((RecordingDisposition event) {
        // _log('onProgress 回调触发, 分贝: ${event.decibels}');
        if (event.decibels != null) {
          setState(() {
            _volumeLevel = event.decibels!; //更新音量值
          });
          _checkSpeakingStatus(); // 检查说话状态
        }
      });
      // 监听音频数据流
      _audioDataStreamController.stream.listen((Uint8List audioData) {
        if (_isSpeaking){
          // _log('Received audio data: ${audioData.length} bytes');  
          _lasttran.addAudioData(List.from(audioData));  
        }  
        // 这里可以进一步处理音频数据，例如保存到文件或上传到服务器
      });
      setState(() {
        _audioFilePath = tempPath;
        _isRecording = true;
      });
      _log('录音开始');
    } catch (e) {
      _log('录音开始 异常: $e');
    }
  }

  // 停止录音
  void _stopRecording() async {
    try {
      if (!_isRecording) return; // 防止重复调用
        await _soundRecorder?.stopRecorder();
        await _soundRecorder?.closeRecorder();
        await _lasttran.close();
      setState(() {
        _isRecording = false;
        _volumeLevel = 0.0; //重置音量值
      });
      _log('录音停止');
    } catch (e) {
      _log('录音停止 异常: $e');
    }
  }

  // 播放录音
  void _playRecording() async {
    // try {
    //   if (_audioFilePath != null) {
    //     await _audioPlayer?.play(DeviceFileSource(_audioFilePath!));
    //     _log('播放录音');
    //   }
    // } catch (e) {
    //   _log('播放录音 异常: $e');
    // }
  }

  // 检查说话状态
  _checkSpeakingStatus() {
    if (_volumeLevel > _speakingThreshold && !_isSpeaking) {
      // 音量高于阈值，表示开始说话
      setState(() {
        _isSpeaking = true;
      });
      _log('开始说话');
      _stateSpeak = 1;
      _lasttran = _sdk.createTransTask();
    } else if (_volumeLevel < _silenceThreshold) {
      // 音量低于阈值
      if (_lastBelowThresholdTime == null) {
        // 记录第一次低于阈值的时间
        _lastBelowThresholdTime = DateTime.now();
      } else if (DateTime.now().difference(_lastBelowThresholdTime!) >
          _silenceDuration) {
        // 持续低于阈值超过指定时间，表示结束说话
        if (_isSpeaking) {
          setState(() {
            _isSpeaking = false;
          });
          _log('结束说话');
          _stateSpeak = 3;
          _lasttran.close();
        }
      }
    } else {
      // 音量恢复到阈值以上，重置计时器
      _lastBelowThresholdTime = null;
    }
    _stateSpeak = 2;
  }

  // 添加日志信息并自动滚动
  void _log(String message) {
    print("输出日志:${message}");
    setState(() {
      _logs.add(message); // 从顶部插入新日志
    });
    _scrollToBottom();
  }

  // 滚动到底部
  void _scrollToBottom() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (_scrollController.hasClients) {
        _scrollController.animateTo(
          _scrollController.position.maxScrollExtent, // 滚动到底部
          duration: Duration(milliseconds: 200),
          curve: Curves.easeInOut,
        );
      }
    });
  }

  @override
  void dispose() {
    _soundRecorder?.closeRecorder();
    _audioPlayer?.dispose();
    _scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('录音与播放')),
      body: Column(
        children: [
          // 滑动面板（日志区域）
          Expanded(
            child: Padding(
              padding: const EdgeInsets.all(8.0),
              child: Container(
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.blue),
                  borderRadius: BorderRadius.circular(10),
                ),
                child: ListView.builder(
                  controller: _scrollController,
                  itemCount: _logs.length,
                  itemBuilder: (context, index) {
                    return Padding(
                      padding: const EdgeInsets.symmetric(
                          vertical: 0.0), // 设置日志项间的垂直间距
                      child: ListTile(
                        title: Text(_logs[index]),
                      ),
                    );
                  },
                ),
              ),
            ),
          ),

          // 底部按钮区域
          Padding(
              padding: const EdgeInsets.all(20.0),
              child:
                  Row(mainAxisAlignment: MainAxisAlignment.center, children: [
                // 音量图标和音量值
                Row(
                  children: [
                    Icon(
                      Icons.volume_up,
                      size: 30,
                    ),
                    SizedBox(width: 10), // 间距
                    Text(
                      '${_volumeLevel.toStringAsFixed(2)} dB', //显示音量值，保留两位小数
                      style: TextStyle(fontSize: 16),
                    ),
                  ],
                ),
                SizedBox(width: 20), // 间距
                // 按钮区域
                GestureDetector(
                  onTapDown: (details) {
                    _startRecording(); // 按下时开始录音
                  },
                  onTapUp: (details) {
                    _stopRecording(); // 抬起时停止录音并播放
                    _playRecording(); // 播放录音
                  },
                  child: Container(
                    margin: EdgeInsets.all(20),
                    padding: EdgeInsets.all(20),
                    decoration: BoxDecoration(
                      color: Colors.blue,
                      shape: BoxShape.circle,
                    ),
                    child: Icon(
                      Icons.mic,
                      color: Colors.white,
                      size: 50,
                    ),
                  ),
                ),
              ]))
        ],
      ),
    );
  }

  // 根据音量值动态调整图标颜色
  Color _getVolumeColor() {
    if (_volumeLevel < -40) {
      return Colors.green; // 低音量
    } else if (_volumeLevel < -20) {
      return Colors.yellow; // 中音量
    } else {
      return Colors.red; // 高音量
    }
  }
}