using NAudio.Wave;

namespace ScreenRecorder;

/// <summary>
/// 录制系统麦克风音频，保存为 WAV 文件
/// </summary>
public class AudioService : IDisposable
{
    private WaveInEvent? _waveIn;
    private WaveFileWriter? _writer;
    private string? _outputPath;

    public void Start(string outputPath)
    {
        _outputPath = outputPath;
        _waveIn = new WaveInEvent
        {
            WaveFormat = new WaveFormat(44100, 1),
            BufferMilliseconds = 50
        };

        _writer = new WaveFileWriter(outputPath, _waveIn.WaveFormat);
        _waveIn.DataAvailable += OnDataAvailable;
        _waveIn.StartRecording();
    }

    private void OnDataAvailable(object? sender, WaveInEventArgs e)
    {
        _writer?.Write(e.Buffer, 0, e.BytesRecorded);
    }

    public void Stop()
    {
        _waveIn?.StopRecording();
        _waveIn?.Dispose();
        _waveIn = null;
        _writer?.Dispose();
        _writer = null;
    }

    public void Dispose() => Stop();
}