import { useState, useRef, useCallback } from "react";

// 新增音频源类型,playback表示音频播放,mic表示麦克风
type AudioSourceType = "mic" | "playback";

interface ProcessState {
  recording: boolean;
  transcribing: boolean;
  generating: boolean;
  synthesizing: boolean;
  error?: string;
}

interface VoiceAssistantProps {
  greeting: string;
}

const ANALYSER_FFT_SIZE = 128;
const VOLUME_SENSITIVITY = 1.5;
const SMOOTHING_FACTOR = 0.7;
const BAR_COUNT = 12;

const VoiceAssistant = ({ greeting }: VoiceAssistantProps) => {
  const [isListening, setIsListening] = useState(false);
  const [processState, setProcessState] = useState<ProcessState>({
    recording: false,
    transcribing: false,
    generating: false,
    synthesizing: false,
  });
  const [asrText, setAsrText] = useState("");
  const [answerText, setAnswerText] = useState("");
  const mediaRecorder = useRef<MediaRecorder | null>(null);
  const audioChunks = useRef<Blob[]>([]);
  const audioElement = useRef<HTMLAudioElement>(null);

  const barsRef = useRef<HTMLDivElement>(null);

  const mediaStreamRef = useRef<MediaStream | null>(null);
  const audioContextRef = useRef<AudioContext | null>(null);
  const analyserRef = useRef<AnalyserNode | null>(null);
  const animationFrameRef = useRef<number | null>(null);

  const dataArrayRef = useRef<Uint8Array | null>(null);
  const lastValuesRef = useRef<number[]>(new Array(BAR_COUNT).fill(10));
  const [audioSourceType, setAudioSourceType] =
    useState<AudioSourceType>("mic");

  const updateState = (newState: Partial<ProcessState>) => {
    setProcessState((prev) => ({ ...prev, ...newState }));
  };

  const cleanupAudio = useCallback(async () => {
    mediaStreamRef.current?.getTracks().forEach((track) => track.stop());
    if (audioContextRef.current?.state !== "closed") {
      await audioContextRef.current?.close();
    }
    if (animationFrameRef.current) {
      cancelAnimationFrame(animationFrameRef.current);
      animationFrameRef.current = null;
    }
  }, []);
  const initializeAudioContext = useCallback(() => {
    const AudioContextClass =
      window.AudioContext || (window as any).webkitAudioContext;
    audioContextRef.current = new AudioContextClass();
    analyserRef.current = audioContextRef.current.createAnalyser();
    analyserRef.current.fftSize = ANALYSER_FFT_SIZE;
    analyserRef.current.smoothingTimeConstant = SMOOTHING_FACTOR;
    dataArrayRef.current = new Uint8Array(
      analyserRef.current.frequencyBinCount
    );
  }, []);

  const startRecording = async () => {
    try {
      const stream = await navigator.mediaDevices.getUserMedia({
        audio: { sampleRate: 16000, channelCount: 1, sampleSize: 16 },
      });

      mediaRecorder.current = new MediaRecorder(stream);
      audioChunks.current = [];

      mediaRecorder.current.ondataavailable = (e) => {
        audioChunks.current.push(e.data);
      };

      mediaRecorder.current.start(500);
      updateState({ recording: true, error: undefined });
    } catch (err) {
      updateState({ error: "麦克风访问失败，请检查权限设置" });
    }
  };

  // 新增切换音频源的函数
  const stopRecording = async () => {
    // 如果当前没有录音器,则返回
    if (!mediaRecorder.current) return;
    // 停止录音器
    mediaRecorder.current.stop();
    // 更新状态为未录音
    updateState({ recording: false });
    // 等待录音器停止录音
    mediaRecorder.current.onstop = async () => {
      try {
        // 停止录音器
        const audioBlob = new Blob(audioChunks.current, { type: "audio/wav" });
        await processAudio(audioBlob);
      } finally {
        audioChunks.current = [];
      }
    };
  };

 
  const processAudio = async (audioBlob: Blob) => {
    const formData = new FormData();
    formData.append("audio", audioBlob, "recording.wav");

    try {
      updateState({ transcribing: true });
      // 发送请求到后端
      const asrResponse = await fetch("http://localhost:5000/asr", {
        method: "POST",
        body: formData,
      });
      // 如果请求失败,则抛出错误
      if (!asrResponse.ok) throw new Error("语音识别失败");
      // 获取后端返回的文本
      const asrData = await asrResponse.json();
      setAsrText(asrData.asr_text);
      updateState({ transcribing: false, generating: true });

      // 发送请求到后端，生成回答
      const generateResponse = await fetch("http://localhost:5000/generate", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ asr_text: asrData.asr_text }),
      });

      if (!generateResponse.ok) throw new Error("生成回答失败");

      const generateData = await generateResponse.json();
      setAnswerText(generateData.answer_text);
      updateState({ generating: false, synthesizing: true });

      // 播放合成的音频，增加可视化效果
      if (audioElement.current) {
        startVisualization();
        // 播放合成的音频
        audioElement.current.src = `http://localhost:5000${generateData.audio_url}`;
        // 播放音频
        audioElement.current.play()
        .catch((err) => {
          console.error("播放失败:", err);
          updateState({ error: "音频播放失败" });
        });
      }
    } catch (err) {
      updateState({ error: err instanceof Error ? err.message : "未知错误" });
    } finally {
      updateState({
        transcribing: false,
        generating: false,
        synthesizing: false,
      });
    }
  };

  const getStatusText = () => {
    if (processState.error) return processState.error;
    if (processState.recording) return "录音中... 🎤";
    if (processState.transcribing) return "语音识别中... 🔍";
    if (processState.generating) return "生成回答中... 💡";
    if (processState.synthesizing) return "语音合成中... 🎵";
    return "点击开始对话";
  };

  const startVisualization = useCallback(() => {
    if (!analyserRef.current || !dataArrayRef.current || !barsRef.current) {
      console.warn("可视化组件未就绪");
      return;
    }

    if (animationFrameRef.current) {
      cancelAnimationFrame(animationFrameRef.current);
      animationFrameRef.current = null;
    }

    const bufferLength = analyserRef.current.frequencyBinCount;
    const updateBars = () => {
      try {
        analyserRef.current!.getByteFrequencyData(dataArrayRef.current!);

        const bars = barsRef.current!.children;
        for (let i = 0; i < bars.length; i++) {
          const bar = bars[i] as HTMLElement;
          const dataIndex = Math.floor((i / BAR_COUNT) * (bufferLength / 2));
          const rawValue =
            (dataArrayRef.current![dataIndex] / 255) * 100 * VOLUME_SENSITIVITY;

          const smoothValue = Math.min(
            100,
            Math.max(10, rawValue * 0.6 + lastValuesRef.current[i] * 0.4)
          );
          lastValuesRef.current[i] = smoothValue;

          bar.style.cssText = `
          height: ${smoothValue}%;
          transform: scaleY(${0.8 + (smoothValue / 100) * 0.6});
          transition: ${i === 0 ? "none" : "height 50ms linear"};
        `;
        }

        animationFrameRef.current = requestAnimationFrame(updateBars);
      } catch (err) {
        console.error("可视化更新失败:", err);
      }
    };

    animationFrameRef.current = requestAnimationFrame(updateBars);
  }, [analyserRef, dataArrayRef, barsRef]);

  // 切换监听状态
  const toggleListening = useCallback(async () => {
    if (isListening) { // 如果正在监听
      await cleanupAudio(); // 清理现有音频
    } else {  // 否则
      try { // 尝试
        await cleanupAudio(); // 清理现有音频
        initializeAudioContext(); // 初始化音频上下文

        if (audioSourceType === "mic") { // 如果音频源类型是麦克风
          const stream = await navigator.mediaDevices.getUserMedia({ // 获取用户媒体
            audio: { noiseSuppression: true, echoCancellation: true }, // 音频配置
          }); // 等待获取用户媒体
          mediaStreamRef.current = stream; // 设置媒体流
          const source = // 创建音频源
            audioContextRef.current!.createMediaStreamSource(stream); // 创建音频源
          source.connect(analyserRef.current!); // 连接到分析器
        } else {
          const audio = new Audio("/test-audio.mp3"); // 创建音频元素
          const source = // 创建音频源
            audioContextRef.current!.createMediaElementSource(audio); // 创建音频源
          source.connect(analyserRef.current!); // 连接到分析器
          audio.play();  // 播放音频
        }

        analyserRef.current!.connect(audioContextRef.current!.destination); // 连接到目标
        startVisualization(); // 开始可视化
      } catch (err) {
        console.error("初始化失败:", err);
        updateState({ error: "音频初始化失败" });
      }
    }
    setIsListening((prev) => !prev);
  }, [
    isListening,
    audioSourceType,
    cleanupAudio,
    initializeAudioContext,
    startVisualization,
  ]);

  // 示例音频播放
  const handlePlaySample = async () => {
    try {
      await cleanupAudio(); // 清理现有音频
      initializeAudioContext(); // 初始化音频上下文

      const audio = new Audio("/test-audio.mp3"); // 创建音频元素
      const source = audioContextRef.current!.createMediaElementSource(audio); // 创建音频源
      source.connect(analyserRef.current!); // 连接到分析器
      analyserRef.current!.connect(audioContextRef.current!.destination); // 连接到目标

      await audio.play(); // 播放音频
      startVisualization(); // 开始可视化

      audio.onended = () => {
        setIsListening(false);
        if (animationFrameRef.current) {
          cancelAnimationFrame(animationFrameRef.current);
          animationFrameRef.current = null;
        }
      };
    } catch (err) {
      console.error("播放示例失败:", err);
      updateState({ error: "示例播放失败" });
    }
  };

  return (
    <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 text-center w-full px-4">
      {/* 问候语 */}
      <h1 className="text-6xl font-light mb-8 drop-shadow-glow">{greeting}</h1>
      {/* 较小较细的字体显示{asrText || "等待语音输入..."}*/}
      <h3 className="text-sm font-light mb-8">{asrText || "等待中..."}</h3>
      {/*较小较细的字体显示{answerText || "等待生成回答..."}*/}
      <h2 className="text-sm font-light mb-8">
        {answerText || "AI助手待命中"}
      </h2>

      {/* 音频源切换 */}
      <div className="mb-4 flex justify-center gap-4">
        <button
          onClick={() => setAudioSourceType("mic")}
          className={`px-4 py-2 rounded-lg ${
            audioSourceType === "mic" ? "bg-blue-500 text-white" : "bg-gray-200"
          }`}
        >
          麦克风
        </button>
        <button
          onClick={() => setAudioSourceType("playback")}
          className={`px-4 py-2 rounded-lg ${
            audioSourceType === "playback"
              ? "bg-blue-500 text-white"
              : "bg-gray-200"
          }`}
        >
          音频播放
        </button>
      </div>
      {/* 示例播放按钮 */}
      {audioSourceType === "playback" && (
        <button
          onClick={handlePlaySample}
          className="mt-4 px-6 py-2 bg-green-500 text-white rounded-lg hover:bg-green-600 transition-colors"
        >
          播放示例音频
        </button>
      )}

      {/* 优化后的音频波形可视化 */}
      <div className="relative inline-block">
        <button
          onClick={() => {
            toggleListening();
            processState.recording ? stopRecording() : startRecording();
          }}
          className={[
            "group relative flex h-20 items-end gap-1.5 rounded-3xl p-6",
            "bg-gradient-to-b from-black/80 to-gray-900/90",
            "shadow-[0_0_20px_0_rgba(34,211,238,0.2)] hover:shadow-[0_0_30px_0_rgba(109,213,237,0.3)]",
            "transition-shadow duration-300 ease-out",
            isListening ? "ring-2 ring-cyan-400/20" : "",
          ].join(" ")}
          style={{
            // 禁用will-change优化（经测试反而降低性能）
            backdropFilter: "blur(12px)", // 直接使用CSS属性
            WebkitBackdropFilter: "blur(12px)",
          }}
        >
          {/* 优化后的柱状图容器 */}
          <div ref={barsRef} className="flex h-full w-full items-end gap-1.5">
            {[...Array(BAR_COUNT)].map((_, index) => (
              <div
                key={index}
                className={[
                  "w-2.5 rounded-full",
                  "bg-gradient-to-t from-cyan-400/90 via-blue-400/90 to-purple-500/90",
                  "transition-transform duration-150 ease-out",
                ].join(" ")}
                style={{
                  willChange: "height, transform", // 提示浏览器优化
                  boxShadow: "0 0 8px -2px rgba(52,211,254,0.4)",
                  height: "10%", // 初始高度
                }}
              />
            ))}
          </div>
        </button>
      </div>

      {/* 底部状态信息 */}
      <div className="mt-8 text-xs text-gray-500 space-y-1">
        <p>支持唤醒词："魔镜魔镜"</p>
        <div className="flex items-center justify-center gap-1.5">
          <div className="relative flex items-center">
            {/* 呼吸圆点指示器 */}
            <div
              className={`w-2 h-2 rounded-full ${
                isListening ? "bg-green-400 animate-breath" : "bg-gray-400"
              }`}
            />
            {/* 扩散波纹效果 */}
            {isListening && (
              <div className="absolute inset-0 rounded-full bg-green-400/20 animate-ping" />
            )}
          </div>
          <span>{getStatusText()}</span>
        </div>

        {/* 音频播放 */}
        <audio
          ref={audioElement}
          controls={process.env.NODE_ENV === "development"} // 开发环境显示 controls
          onEnded={() => updateState({ synthesizing: false })}
        />
      </div>
    </div>
  );
};

export default VoiceAssistant;