/// <summary>
/// 文件批處理核心類（線程安全設(shè)計）
/// </summary>
public class FileBatchProcessor
{
    private readonly int _maxThreads = Environment.ProcessorCount * 2;
    private readonly ConcurrentQueue<string> _fileQueue = new();
    private readonly CancellationTokenSource _cts = new();
    
    // 支持MD5/SHA256雙算法校驗
    private readonly HashAlgorithm _hashProvider;
    
    public FileBatchProcessor(HashType hashType = HashType.SHA256) 
    {
        _hashProvider = hashType == HashType.MD5 ? 
            MD5.Create() : SHA256.Create();
    }
}

/// <summary>
/// 啟動多線程處理隊列
/// </summary>
public void StartProcessing(Action<FileTask> processAction)
{
    var parallelOptions = new ParallelOptions {
        MaxDegreeOfParallelism = _maxThreads,
        CancellationToken = _cts.Token
    };
 
    Parallel.ForEach(_fileQueue.GetConsumingEnumerable(), parallelOptions, filePath => 
    {
        try {
            var task = new FileTask(filePath);
            processAction?.Invoke(task);
            GenerateFileHash(task); // 生成哈希校驗碼
        }
        catch (IOException ex) {
            LogError($"文件操作失敗: {ex.Message}");
        }
    });
}

/// <summary>
/// 獲取匹配正則的文件列表（參考網(wǎng)頁5）
/// </summary>
public IEnumerable<string> GetFilteredFiles(string directory, string regexPattern)
{
    var regex = new Regex(regexPattern, RegexOptions.IgnoreCase);
    
    return Directory.EnumerateFiles(directory, "*.*", SearchOption.AllDirectories)
        .Where(file => regex.IsMatch(Path.GetFileName(file)))
        .OrderBy(f => f);
}

/// <summary>
/// 執(zhí)行文件重命名操作（支持原子操作）
/// </summary>
public void SafeRenameFile(string sourcePath, string newName)
{
    string targetPath = Path.Combine(Path.GetDirectoryName(sourcePath), newName);
    
    // 使用File.Move的原子特性
    if (File.Exists(targetPath)) File.Delete(targetPath);
    File.Move(sourcePath, targetPath);
    
    Console.WriteLine($"重命名完成: {Path.GetFileName(sourcePath)} => {newName}");
}
 
/// <summary>
/// 使用Magick.NET進(jìn)行圖像格式轉(zhuǎn)換
/// </summary>
public void ConvertImageFormat(string inputPath, MagickFormat outputFormat)
{
    using var image = new MagickImage(inputPath);
    image.Format = outputFormat;
    image.Write(Path.ChangeExtension(inputPath, outputFormat.ToString().ToLower()));
}

using System.Collections.Concurrent;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
using ImageMagick;
 
namespace FileProcessor
{
    /// <summary>
    /// 文件處理模式枚舉
    /// </summary>
    public enum ProcessMode
    {
        Rename,
        ConvertFormat,
        Both
    }
 
    /// <summary>
    /// 文件批量處理器核心類（線程安全）
    /// 技術(shù)亮點：
    /// 1. 多線程流水線處理
    /// 2. 正則表達(dá)式文件過濾
    /// 3. 文件哈希校驗
    /// 4. 原子性文件操作
    /// </summary>
    public class FileBatchProcessor : IDisposable
    {
        #region 屬性與字段
        private readonly ConcurrentQueue<string> _fileQueue = new();
        private readonly HashAlgorithm _hashProvider;
        private bool _disposed;
        
        /// <summary>
        /// 最大并發(fā)線程數(shù)（默認(rèn)CPU核心數(shù)×2）
        /// </summary>
        public int MaxDegreeOfParallelism { get; set; } = Environment.ProcessorCount * 2;
 
        /// <summary>
        /// 文件格式轉(zhuǎn)換目標(biāo)格式（默認(rèn)轉(zhuǎn)JPEG）
        /// </summary>
        public MagickFormat TargetFormat { get; set; } = MagickFormat.Jpeg;
 
        /// <summary>
        /// 文件名正則過濾模式
        /// </summary>
        public string? FileNamePattern { get; set; }
        #endregion
 
        #region 構(gòu)造函數(shù)
        public FileBatchProcessor(HashType hashType = HashType.SHA256)
        {
            _hashProvider = hashType switch
            {
                HashType.MD5 => MD5.Create(),
                _ => SHA256.Create()
            };
        }
        #endregion
 
        #region 核心方法
        /// <summary>
        /// 添加文件到處理隊列（支持正則過濾）
        /// </summary>
        /// <param name="directory">目標(biāo)目錄</param>
        /// <param name="searchOption">搜索模式</param>
        public void EnqueueFiles(string directory, 
            SearchOption searchOption = SearchOption.AllDirectories)
        {
            var regex = !string.IsNullOrEmpty(FileNamePattern) 
                ? new Regex(FileNamePattern, RegexOptions.IgnoreCase) 
                : null;
 
            foreach (var file in Directory.EnumerateFiles(directory, "*.*", searchOption))
            {
                if (regex == null || regex.IsMatch(Path.GetFileName(file)))
                {
                    _fileQueue.Enqueue(file);
                }
            }
        }
 
        /// <summary>
        /// 啟動批量處理流程
        /// </summary>
        /// <param name="renamePattern">新文件名模式（支持{name}、{ext}占位符）</param>
        /// <param name="mode">處理模式</param>
        public void ProcessFiles(string renamePattern, ProcessMode mode)
        {
            Parallel.ForEach(_fileQueue, new ParallelOptions
            {
                MaxDegreeOfParallelism = MaxDegreeOfParallelism
            }, file =>
            {
                try
                {
                    var task = new FileProcessTask(file);
                    
                    // 執(zhí)行重命名
                    if (mode is ProcessMode.Rename or ProcessMode.Both)
                    {
                        var newName = BuildNewFileName(file, renamePattern);
                        SafeRenameFile(task, newName);
                    }
 
                    // 執(zhí)行格式轉(zhuǎn)換
                    if (mode is ProcessMode.ConvertFormat or ProcessMode.Both)
                    {
                        ConvertFileFormat(task);
                    }
 
                    // 生成文件哈希
                    GenerateFileHash(task);
                    LogResult(task);
                }
                catch (Exception ex)
                {
                    LogError($"處理失敗: {file} - {ex.Message}");
                }
            });
        }
        #endregion
 
        #region 業(yè)務(wù)邏輯方法
        /// <summary>
        /// 構(gòu)建新文件名（支持動態(tài)模板）
        /// </summary>
        private string BuildNewFileName(string originalPath, string pattern)
        {
            string dir = Path.GetDirectoryName(originalPath)!;
            string name = Path.GetFileNameWithoutExtension(originalPath);
            string ext = Path.GetExtension(originalPath);
            
            return Path.Combine(dir, 
                pattern
                    .Replace("{name}", name)
                    .Replace("{ext}", ext)
                    .Replace("{timestamp}", $"{DateTime.Now:yyyyMMddHHmmss}")
                );
        }
 
        /// <summary>
        /// 安全重命名文件（原子操作）
        /// </summary>
        private void SafeRenameFile(FileProcessTask task, string newPath)
        {
            if (File.Exists(newPath)) File.Delete(newPath);
            File.Move(task.OriginalPath, newPath);
            task.NewPath = newPath;
        }
 
        /// <summary>
        /// 轉(zhuǎn)換文件格式（使用Magick.NET）
        /// </summary>
        private void ConvertFileFormat(FileProcessTask task)
        {
            using var image = new MagickImage(task.CurrentPath);
            image.Format = TargetFormat;
            string newPath = Path.ChangeExtension(task.CurrentPath, 
                TargetFormat.ToString().ToLower());
            image.Write(newPath);
            
            if (newPath != task.CurrentPath) 
            {
                File.Delete(task.CurrentPath);
                task.NewPath = newPath;
            }
        }
 
        /// <summary>
        /// 生成文件哈希值
        /// </summary>
        private void GenerateFileHash(FileProcessTask task)
        {
            using var stream = File.OpenRead(task.CurrentPath);
            byte[] hashBytes = _hashProvider.ComputeHash(stream);
            task.FileHash = BitConverter.ToString(hashBytes).Replace("-", "");
        }
        #endregion
 
        #region 輔助方法
        private void LogResult(FileProcessTask task)
        {
            Console.WriteLine($"""
                ======== 處理完成 ========
                原文件: {Path.GetFileName(task.OriginalPath)}
                新路徑: {Path.GetFileName(task.NewPath)}
                文件哈希: {task.FileHash}
                處理時間: {DateTime.Now:yyyy-MM-dd HH:mm:ss}
                """);
        }
 
        private void LogError(string message)
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine($"[ERROR] {DateTime.Now:HH:mm:ss} {message}");
            Console.ResetColor();
        }
        #endregion
 
        #region 釋放資源
        public void Dispose()
        {
            if (_disposed) return;
            _hashProvider.Dispose();
            _disposed = true;
            GC.SuppressFinalize(this);
        }
        #endregion
    }
 
    /// <summary>
    /// 文件處理任務(wù)對象
    /// </summary>
    public class FileProcessTask
    {
        public string OriginalPath { get; }
        public string? NewPath { get; set; }
        public string FileHash { get; set; } = string.Empty;
 
        public string CurrentPath => NewPath ?? OriginalPath;
 
        public FileProcessTask(string path) => OriginalPath = path;
    }
 
    public enum HashType { MD5, SHA256 }
}

using var processor = new FileBatchProcessor(HashType.SHA256) 
{
    FileNamePattern = @"\.(jpg|png)$", // 篩選圖片文件
    TargetFormat = MagickFormat.WebP   // 設(shè)置轉(zhuǎn)換格式
};

// 加載D盤Images目錄下所有匹配文件
processor.EnqueueFiles(@"D:\Images");

// 執(zhí)行重命名+格式轉(zhuǎn)換
processor.ProcessFiles(
    renamePattern: "converted_{name}_{timestamp}.webp",
    mode: ProcessMode.Both
);