fix: practice defense driving...seal it all

src/StreamShorts.Console/Commands/DefaultCommand.cs

@@ -1,6 +1,6 @@
 namespace StreamShorts.Console.Commands;
 
-internal class DefaultCommand(
+internal sealed class DefaultCommand(
   IFileSystem fileSystem,
   IAnsiConsole console,
   IAudioExtractor audioExtractor,

src/StreamShorts.Console/Hosting/TypeRegistrar.cs

@@ -1,6 +1,6 @@
 namespace StreamShorts.Console.Hosting;
 
-internal class TypeRegistrar(IHostBuilder builder) : ITypeRegistrar
+internal sealed class TypeRegistrar(IHostBuilder builder) : ITypeRegistrar
 {
   private readonly IHostBuilder _builder = builder;
 

src/StreamShorts.Console/Hosting/TypeResolver.cs

@@ -1,6 +1,6 @@
 namespace StreamShorts.Console.Hosting;
 
-internal class TypeResolver(IHost provider) : ITypeResolver, IDisposable
+internal sealed class TypeResolver(IHost provider) : ITypeResolver, IDisposable
 {
   private readonly IHost _host = provider ?? throw new ArgumentNullException(nameof(provider));
 

src/StreamShorts.Library/Media/Audio/AudioExtractor.cs

@@ -4,7 +4,7 @@ namespace StreamShorts.Library.Media.Audio;
 /// Extracts audio from video files.
 /// </summary>
 /// <inheritdoc/>
-public class AudioExtractor : IAudioExtractor
+public sealed class AudioExtractor : IAudioExtractor
 {
   private readonly IVideoService _videoService = new FFMpegService();
 

src/StreamShorts.Library/Media/Audio/FailedAudioExtractionException.cs

@@ -1,15 +1,30 @@
 namespace StreamShorts.Library.Media.Audio;
 
-public class FailedAudioExtractionException : Exception
+/// <summary>
+/// Represents an error that occurs when audio extraction fails.
+/// </summary>
+public sealed class FailedAudioExtractionException : Exception
 {
+  /// <summary>
+  /// Initializes a new instance of the <see cref="FailedAudioExtractionException"/> class.
+  /// </summary>
   public FailedAudioExtractionException() : base()
   {
   }
 
+  /// <summary>
+  /// Initializes a new instance of the <see cref="FailedAudioExtractionException"/> class with a specified error message.
+  /// </summary>
+  /// <param name="message">The error message that explains the reason for the exception.</param>
   public FailedAudioExtractionException(string message) : base(message)
   {
   }
 
+  /// <summary>
+  /// Initializes a new instance of the <see cref="FailedAudioExtractionException"/> class with a specified error message and a reference to the inner exception that is the cause of this exception.
+  /// </summary>
+  /// <param name="message">The error message that explains the reason for the exception.</param>
+  /// <param name="innerException">The exception that is the cause of the current exception.</param>
   public FailedAudioExtractionException(string message, Exception innerException) : base(message, innerException)
   {
   }

src/StreamShorts.Library/Media/FFMpegService.cs

@@ -10,7 +10,7 @@ namespace StreamShorts.Library.Media;
 /// Represents a service for processing video files using FFMpeg.
 /// </summary>
 /// <inheritdoc/>
-internal class FFMpegService : IVideoService
+internal sealed class FFMpegService : IVideoService
 {
   public async Task<bool> ExtractAudioFromVideoAsync(Stream video, Stream audio)
   {

src/StreamShorts.Library/Media/NAudioService.cs

@@ -7,7 +7,7 @@ namespace StreamShorts.Library.Media;
 /// Represents a service for processing audio files using NAudio.
 /// </summary>
 /// <inheritdoc/>
-internal class NAudioService : IAudioService
+internal sealed class NAudioService : IAudioService
 {
   public Stream ConvertMp3ToWav16(Stream mp3)
   {

src/StreamShorts.Library/Transcription/TranscriptionSegment.cs

@@ -6,7 +6,7 @@ namespace StreamShorts.Library.Transcription;
 /// <param name="StartTime">The start time of the segment.</param>
 /// <param name="EndTime">The end time of the segment.</param>
 /// <param name="Text">The transcribed text of the segment.</param>
-public record TranscriptionSegment(
+public sealed record TranscriptionSegment(
   TimeSpan StartTime,
   TimeSpan EndTime,
   string Text

src/StreamShorts.Library/Transcription/WhisperTranscriber.cs

@@ -11,7 +11,7 @@ namespace StreamShorts.Library.Transcription;
 /// Represents a transcriber that uses Whisper for audio transcription.
 /// </summary>
 /// <inheritdoc/>
-public class WhisperTranscriber : ITranscriber
+public sealed class WhisperTranscriber : ITranscriber, IDisposable
 {
   private readonly IAudioService _audioService = new NAudioService();
   private WhisperProcessor? _whisperProcessor;
@@ -76,4 +76,10 @@ public class WhisperTranscriber : ITranscriber
       yield return result;
     }
   }
+
+  public void Dispose()
+  {
+    _whisperProcessor?.Dispose();
+    _whisperProcessor = null;
+  }
 }