frontend/src/hooks/useAudioAnalyzer.ts

import { useRef, useEffect, useState } from 'react';

interface UseAudioAnalyzerReturn {
  audioData: Uint8Array;
  analyser: AnalyserNode | null;
  connectToStream: (stream: MediaStream) => void;
  disconnect: () => void;
}

export const useAudioAnalyzer = (fftSize: number = 256): UseAudioAnalyzerReturn => {
  const [audioData, setAudioData] = useState<Uint8Array>(new Uint8Array(fftSize / 2));
  const [analyser, setAnalyser] = useState<AnalyserNode | null>(null);
  const audioContextRef = useRef<AudioContext | null>(null);
  const sourceRef = useRef<MediaStreamAudioSourceNode | null>(null);
  const animationFrameRef = useRef<number | null>(null);

  const connectToStream = (stream: MediaStream) => {
    try {
      // Clean up existing connections
      disconnect();

      // Create new audio context and analyser
      const audioContext = new (window.AudioContext || (window as any).webkitAudioContext)();
      const analyserNode = audioContext.createAnalyser();
      analyserNode.fftSize = fftSize;
      analyserNode.smoothingTimeConstant = 0.8;

      // Connect stream to analyser
      const source = audioContext.createMediaStreamSource(stream);
      source.connect(analyserNode);

      // Store references
      audioContextRef.current = audioContext;
      sourceRef.current = source;
      setAnalyser(analyserNode);

      // Start updating audio data
      const bufferLength = analyserNode.frequencyBinCount;
      const dataArray = new Uint8Array(bufferLength);

      const updateAudioData = () => {
        if (analyserNode) {
          analyserNode.getByteFrequencyData(dataArray);
          setAudioData(new Uint8Array(dataArray));
          animationFrameRef.current = requestAnimationFrame(updateAudioData);
        }
      };

      updateAudioData();
    } catch (error) {
      console.error('Error setting up audio analyzer:', error);
    }
  };

  const disconnect = () => {
    // Cancel animation frame
    if (animationFrameRef.current) {
      cancelAnimationFrame(animationFrameRef.current);
      animationFrameRef.current = null;
    }

    // Disconnect audio nodes
    if (sourceRef.current) {
      sourceRef.current.disconnect();
      sourceRef.current = null;
    }

    // Close audio context
    if (audioContextRef.current) {
      audioContextRef.current.close();
      audioContextRef.current = null;
    }

    setAnalyser(null);
    setAudioData(new Uint8Array(fftSize / 2));
  };

  // Cleanup on unmount
  useEffect(() => {
    return () => {
      disconnect();
    };
  }, []);

  return {
    audioData,
    analyser,
    connectToStream,
    disconnect,
  };
};