refactor: Refactor the code of the Download command.

src/ZonyLrcTools.Common/Lyrics/LyricsDownloader.cs

@@ -0,0 +1,126 @@
+using System.Text;
+using Microsoft.Extensions.Options;
+using ZonyLrcTools.Common.Configuration;
+using ZonyLrcTools.Common.Infrastructure.DependencyInject;
+using ZonyLrcTools.Common.Infrastructure.Exceptions;
+using ZonyLrcTools.Common.Infrastructure.Extensions;
+using ZonyLrcTools.Common.Infrastructure.Logging;
+using ZonyLrcTools.Common.Infrastructure.Threading;
+
+namespace ZonyLrcTools.Common.Lyrics;
+
+public class LyricsDownloader : ILyricsDownloader, ISingletonDependency
+{
+    private readonly IEnumerable<ILyricsProvider> _lyricsProviders;
+    private readonly IWarpLogger _logger;
+    private readonly GlobalOptions _options;
+
+    public IEnumerable<ILyricsProvider> AvailableProviders => new Lazy<IEnumerable<ILyricsProvider>>(() =>
+    {
+        return _options.Provider.Lyric.Plugin
+            .Where(op => op.Priority != -1)
+            .OrderBy(op => op.Priority)
+            .Join(_lyricsProviders,
+                op => op.Name,
+                loader => loader.DownloaderName,
+                (_, loader) => loader);
+    }).Value;
+
+    public LyricsDownloader(IEnumerable<ILyricsProvider> lyricsProviders,
+        IOptions<GlobalOptions> options,
+        IWarpLogger logger)
+    {
+        _lyricsProviders = lyricsProviders;
+        _logger = logger;
+        _options = options.Value;
+    }
+
+    public async Task DownloadAsync(List<MusicInfo> needDownloadMusicInfos,
+        int parallelCount = 2,
+        CancellationToken cancellationToken = default)
+    {
+        await _logger.InfoAsync("开始下载歌词文件数据...");
+
+        if (parallelCount <= 0)
+        {
+            parallelCount = 1;
+        }
+
+        var warpTask = new WarpTask(parallelCount);
+        var downloadTasks = needDownloadMusicInfos.Select(info =>
+            warpTask.RunAsync(() =>
+                Task.Run(async () =>
+                {
+                    // Try to download lyrics from all available providers.
+                    foreach (var lyricsProvider in AvailableProviders)
+                    {
+                        await DownloadAndWriteLyricsAsync(lyricsProvider, info);
+
+                        if (info.IsSuccessful)
+                        {
+                            _logger.LogSuccessful(info);
+                            return;
+                        }
+                    }
+                }, cancellationToken), cancellationToken));
+
+        await Task.WhenAll(downloadTasks);
+
+        await _logger.InfoAsync($"歌词数据下载完成，成功: {needDownloadMusicInfos.Count(m => m.IsSuccessful)} 失败{needDownloadMusicInfos.Count(m => m.IsSuccessful == false)}。");
+    }
+
+    private async Task DownloadAndWriteLyricsAsync(ILyricsProvider provider, MusicInfo info)
+    {
+        try
+        {
+            var lyrics = await provider.DownloadAsync(info.Name, info.Artist);
+
+            if (lyrics.IsPruneMusic)
+            {
+                info.IsSuccessful = true;
+                return;
+            }
+
+            var newLyricsFilePath = Path.Combine(Path.GetDirectoryName(info.FilePath)!,
+                $"{Path.GetFileNameWithoutExtension(info.FilePath)}.lrc");
+
+            if (File.Exists(newLyricsFilePath))
+            {
+                File.Delete(newLyricsFilePath);
+            }
+
+            // Write lyrics to file.
+            await using (var fileStream = new FileStream(newLyricsFilePath, FileMode.CreateNew, FileAccess.Write))
+            {
+                await using (var binaryWriter = new BinaryWriter(fileStream, Encoding.UTF8))
+                {
+                    binaryWriter.Write(Utf8ToSelectedEncoding(lyrics));
+                    binaryWriter.Flush();
+                }
+            }
+
+            info.IsSuccessful = true;
+        }
+        catch (ErrorCodeException ex)
+        {
+            _logger.LogWarningInfo(ex);
+            info.IsSuccessful = false;
+        }
+        catch (Exception ex)
+        {
+            await _logger.ErrorAsync($"下载歌词文件时发生错误：{ex.Message}，歌曲名: {info.Name}，歌手: {info.Artist}。");
+            info.IsSuccessful = false;
+        }
+    }
+
+    private byte[] Utf8ToSelectedEncoding(LyricsItemCollection lyrics)
+    {
+        var supportEncodings = Encoding.GetEncodings();
+        if (supportEncodings.All(x => x.Name != _options.Provider.Lyric.Config.FileEncoding))
+        {
+            throw new ErrorCodeException(ErrorCodes.NotSupportedFileEncoding);
+        }
+
+        return Encoding.Convert(Encoding.UTF8, Encoding.GetEncoding(_options.Provider.Lyric.Config.FileEncoding), lyrics.GetUtf8Bytes());
+    }
+}