CodePreviewModal.razor

@using Microsoft.JSInterop
@using Microsoft.AspNetCore.Components
@using WebCodeCli.Helpers
@inject IJSRuntime JSRuntime
@inject NavigationManager NavigationManager

@if (_isVisible)
{
    <div class="fixed inset-0 z-[80] overflow-hidden" @onclick="HandleBackdropClick">
        <div class="flex items-center justify-center min-h-screen px-4 pt-4 pb-20 text-center sm:block sm:p-0">
            <!-- 背景遮罩 -->
            <div class="fixed inset-0 transition-opacity bg-black/50 backdrop-blur-sm" aria-hidden="true"></div>

            <!-- 居中技巧 -->
            <span class="hidden sm:inline-block sm:align-middle sm:h-screen" aria-hidden="true">&#8203;</span>

            <!-- 模态框内容 -->
            <div class="inline-block w-full max-w-6xl overflow-hidden text-left align-middle transition-all transform bg-white rounded-2xl shadow-2xl border border-gray-200"
                 @onclick:stopPropagation="true">
                
                <!-- 头部 -->
                <div class="flex items-center justify-between px-6 py-4 border-b border-gray-200 bg-white">
                    <div class="flex items-center gap-3 flex-1 min-w-0">
                        @((MarkupString)GetFileTypeIcon())
                        <div class="flex-1 min-w-0">
                            <h3 class="text-lg font-bold text-gray-900 truncate">@_fileName</h3>
                            <p class="text-xs text-gray-600 truncate">@_filePath</p>
                        </div>
                    </div>
                    <div class="flex items-center gap-2 ml-4">
                        @if (!string.IsNullOrEmpty(_languageLabel))
                        {
                            <span class="@GetLabelColorClass() px-3 py-1 text-xs font-bold text-white rounded-full shadow-sm">@_languageLabel</span>
                        }
                        <span class="text-xs text-gray-600 font-medium">@_fileSize</span>
                    </div>
                </div>

                <!-- 工具栏 -->
                <div class="flex items-center justify-between px-6 py-3 bg-gray-50 border-b border-gray-200">
                    <div class="flex items-center gap-2">
                        @if (_previewType == PreviewType.Code)
                        {
                            <button type="button"
                                    @onclick="CopyCode"
                                    @onclick:stopPropagation="true"
                                    @onclick:preventDefault="true"
                                    class="btn-primary text-sm py-2 px-4 flex items-center gap-2">
                                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
                                </svg>
                                @(_copied ? "✓ 已复制" : "复制代码")
                            </button>
                        }
                        @if (_previewType == PreviewType.Office)
                        {
                            <button type="button"
                                    @onclick="OpenInNewWindow"
                                    @onclick:stopPropagation="true"
                                    class="btn-primary text-sm py-2 px-4 flex items-center gap-2">
                                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14"></path>
                                </svg>
                                在新窗口打开
                            </button>
                        }
                        <button type="button"
                                @onclick="DownloadFile"
                                @onclick:stopPropagation="true"
                                class="btn-secondary text-sm py-2 px-4 flex items-center gap-2">
                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
                            </svg>
                            下载文件
                        </button>
                    </div>
                    <button type="button" @onclick="Close" @onclick:stopPropagation="true" class="text-gray-400 hover:text-gray-600 hover:bg-gray-100 rounded-lg p-2 transition-all">
                        <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12"></path>
                        </svg>
                    </button>
                </div>

                <!-- 内容区域 - 根据文件类型显示不同预览 -->
                @if (_previewType == PreviewType.Office)
                {
                    <!-- Office文档预览区域 - 使用 FilePreviewPanel 组件 -->
                    <div class="max-h-[70vh] overflow-hidden">
                        <FilePreviewPanel 
                            PreviewType="FilePreviewPanel.FilePreviewType.Office"
                            FileName="@_fileName"
                            OfficePreviewUrl="@_officePreviewUrl"
                            OfficePreviewError="@_officePreviewError"
                            IsLoadingOffice="@_isLoadingPreview"
                            MaxHeight="max-h-[70vh]"
                            ContainerClass="h-full" />
                    </div>
                    
                    <!-- 底部信息栏 -->
                    <div class="flex items-center justify-between px-6 py-3 bg-gray-50 border-t border-gray-200 text-xs text-gray-700 font-medium">
                        <div class="flex items-center gap-2">
                            @((MarkupString)GetOfficeTypeIcon())
                            <span>@FilePreviewPanel.GetOfficeTypeName(System.IO.Path.GetExtension(_fileName))</span>
                        </div>
                        <div class="flex items-center gap-2 text-blue-600">
                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 12a9 9 0 01-9 9m9-9a9 9 0 00-9-9m9 9H3m9 9a9 9 0 01-9-9m9 9c1.657 0 3-4.03 3-9s-1.343-9-3-9m0 18c-1.657 0-3-4.03-3-9s1.343-9 3-9m-9 9a9 9 0 019-9"></path>
                            </svg>
                            <span>Microsoft Office 在线预览</span>
                        </div>
                    </div>
                }
                else if (_previewType == PreviewType.Unknown)
                {
                    <!-- 不支持预览的文件类型 -->
                    <div class="h-[50vh] flex flex-col items-center justify-center bg-gray-50 p-8">
                        <div class="w-20 h-20 bg-gray-200 rounded-full flex items-center justify-center mb-4">
                            <svg class="w-10 h-10 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z"></path>
                            </svg>
                        </div>
                        <h4 class="text-lg font-bold text-gray-800 mb-2">无法预览此文件类型</h4>
                        <p class="text-gray-600 text-center max-w-md mb-4">此文件格式不支持在线预览，请下载后使用本地应用程序打开。</p>
                        <button @onclick="DownloadFile" class="btn-primary py-2 px-4 flex items-center gap-2">
                            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-4l-4 4m0 0l-4-4m4 4V4"></path>
                            </svg>
                            下载文件
                        </button>
                    </div>
                }
                else
                {
                    <div class="max-h-[70vh] overflow-hidden">
                        <FilePreviewPanel 
                            PreviewType="@ConvertToFilePreviewType(_previewType)"
                            FileName="@_fileName"
                            FileContent="@_fileContent"
                            Language="@_language"
                            ImageUrl="@_imageDataUrl"
                            PdfDataUrl="@_pdfDataUrl"
                            IsLoading="@_isLoadingPreview"
                            ErrorMessage="@_officePreviewError"
                            CodeElementId="code-preview-content"
                            ShowLineNumbers="false"
                            MaxHeight="max-h-[70vh]"
                            AutoApplyHighlight="true"
                            ContainerClass="h-full" />
                    </div>
                }

                <!-- 底部信息栏 -->
                @if (_previewType == PreviewType.Code)
                {
                    <div class="flex items-center justify-between px-6 py-3 bg-gray-50 border-t border-gray-200 text-xs text-gray-700 font-medium">
                        <div class="flex items-center gap-2">
                            <svg class="w-4 h-4 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 21h10a2 2 0 002-2V5a2 2 0 00-2-2H7a2 2 0 00-2 2v14a2 2 0 002 2z"></path>
                            </svg>
                            共 @_lineCount 行
                        </div>
                        <div class="flex items-center gap-2">
                            <svg class="w-4 h-4 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 10h18M7 15h1m4 0h1m-7 4h12a3 3 0 003-3V8a3 3 0 00-3-3H6a3 3 0 00-3 3v8a3 3 0 003 3z"></path>
                            </svg>
                            编码: UTF-8
                        </div>
                    </div>
                }
                else if (_previewType == PreviewType.Image)
                {
                    <div class="flex items-center justify-center px-6 py-3 bg-gray-50 border-t border-gray-200 text-xs text-gray-700 font-medium">
                        <div class="flex items-center gap-2">
                            <svg class="w-4 h-4 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z"></path>
                            </svg>
                            图片预览
                        </div>
                    </div>
                }
                else if (_previewType == PreviewType.Pdf)
                {
                    <div class="flex items-center justify-center px-6 py-3 bg-gray-50 border-t border-gray-200 text-xs text-gray-700 font-medium">
                        <div class="flex items-center gap-2">
                            <svg class="w-4 h-4 text-red-500" fill="currentColor" viewBox="0 0 20 20">
                                <path fill-rule="evenodd" d="M4 4a2 2 0 012-2h4.586A2 2 0 0112 2.586L15.414 6A2 2 0 0116 7.414V16a2 2 0 01-2 2H6a2 2 0 01-2-2V4z" clip-rule="evenodd"></path>
                            </svg>
                            PDF 文档预览
                        </div>
                    </div>
                }
            </div>
        </div>
    </div>
}

@code {
    // 预览类型枚举
    private enum PreviewType
    {
        Code,      // 代码/文本文件
        Image,     // 图片文件
        Office,    // Office文档(Word/Excel/PowerPoint)
        Pdf,       // PDF文件
        Unknown    // 不支持预览
    }

    // 会话ID，用于生成文件访问URL
    [Parameter] public string SessionId { get; set; } = string.Empty;

    private bool _isVisible = false;
    private string _fileName = string.Empty;
    private string _filePath = string.Empty;
    private string _fileContent = string.Empty;
    private string _language = "plaintext";
    private string _languageLabel = string.Empty;
    private string _fileSize = string.Empty;
    private int _lineCount = 0;
    private bool _copied = false;
    private byte[]? _fileBytes;
    
    // 预览相关
    private PreviewType _previewType = PreviewType.Code;
    private string _imageDataUrl = string.Empty;
    private string _pdfDataUrl = string.Empty;
    private string _officePreviewUrl = string.Empty;
    private string _officePreviewError = string.Empty;
    private bool _isLoadingPreview = false;
    private string _currentSessionId = string.Empty;

    /// <summary>
    /// 显示预览模态框
    /// </summary>
    /// <param name="fileName">文件名</param>
    /// <param name="filePath">文件相对路径</param>
    /// <param name="content">文件文本内容（可选）</param>
    /// <param name="fileBytes">文件字节内容（可选）</param>
    /// <param name="sessionId">会话ID（用于生成文件URL）</param>
    public async Task ShowAsync(string fileName, string filePath, string content, byte[]? fileBytes = null, string? sessionId = null)
    {
        _fileName = fileName;
        _filePath = filePath;
        _fileContent = content;
        _fileBytes = fileBytes;
        _copied = false;
        _officePreviewError = string.Empty;
        _isLoadingPreview = false;
        _currentSessionId = sessionId ?? SessionId;

        // 计算文件大小
        var actualSize = fileBytes?.Length ?? content.Length;
        _fileSize = CalculateFileSize(actualSize);

        // 根据文件扩展名确定预览类型
        var extension = System.IO.Path.GetExtension(fileName).ToLower();
        _previewType = GetPreviewType(extension);
        
        // 根据预览类型进行初始化
        switch (_previewType)
        {
            case PreviewType.Code:
                (_language, _languageLabel) = GetLanguageFromExtension(extension);
                _lineCount = content.Split('\n').Length;
                break;
                
            case PreviewType.Image:
                _languageLabel = GetImageLabel(extension);
                if (fileBytes != null)
                {
                    var mimeType = GetMimeType(extension);
                    _imageDataUrl = $"data:{mimeType};base64,{Convert.ToBase64String(fileBytes)}";
                }
                break;
                
            case PreviewType.Pdf:
                _languageLabel = "PDF";
                if (fileBytes != null)
                {
                    _pdfDataUrl = $"data:application/pdf;base64,{Convert.ToBase64String(fileBytes)}";
                }
                break;
                
            case PreviewType.Office:
                _languageLabel = GetOfficeLabel(extension);
                await InitializeOfficePreview(extension);
                break;
                
            default:
                _languageLabel = extension.TrimStart('.').ToUpper();
                break;
        }

        _isVisible = true;
        StateHasChanged();

        // 如果是代码预览，应用语法高亮
        if (_previewType == PreviewType.Code)
        {
            await Task.Delay(50);
            try
            {
                await JSRuntime.InvokeVoidAsync("applyCodeHighlight");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"应用语法高亮失败: {ex.Message}");
            }
        }
    }

    /// <summary>
    /// 初始化Office在线预览
    /// </summary>
    private async Task InitializeOfficePreview(string extension)
    {
        _isLoadingPreview = true;
        StateHasChanged();

        try
        {
            // 获取当前应用的基础URL
            var baseUri = NavigationManager.BaseUri.TrimEnd('/');
            
            // 构建文件的公开访问URL
            var encodedFilePath = Uri.EscapeDataString(_filePath);
            var fileUrl = $"{baseUri}/api/workspace/{_currentSessionId}/files/{encodedFilePath}";
            
            // 使用 FilePreviewPanel 的静态方法生成预览 URL
            var (previewUrl, errorMessage) = FilePreviewPanel.GenerateOfficePreviewUrl(fileUrl, baseUri);
            _officePreviewUrl = previewUrl;
            _officePreviewError = errorMessage;
        }
        catch (Exception ex)
        {
            _officePreviewError = $"初始化预览失败: {ex.Message}";
        }
        finally
        {
            _isLoadingPreview = false;
        }
    }

    /// <summary>
    /// 在新窗口打开Office预览
    /// </summary>
    private async Task OpenInNewWindow()
    {
        if (!string.IsNullOrEmpty(_officePreviewUrl))
        {
            await JSRuntime.InvokeVoidAsync("window.open", _officePreviewUrl, "_blank");
        }
    }

    /// <summary>
    /// 获取预览类型
    /// </summary>
    private PreviewType GetPreviewType(string extension)
    {
        return extension.ToLower() switch
        {
            // 图片文件
            ".png" or ".jpg" or ".jpeg" or ".gif" or ".webp" or ".bmp" or ".svg" or ".ico" 
                => PreviewType.Image,
            
            // PDF文件
            ".pdf" => PreviewType.Pdf,
            
            // Office文档 - Word
            ".doc" or ".docx" or ".docm" or ".dotx" or ".dotm" or ".odt" 
                => PreviewType.Office,
            
            // Office文档 - Excel
            ".xls" or ".xlsx" or ".xlsm" or ".xlsb" or ".xltx" or ".xltm" or ".csv" or ".ods" 
                => PreviewType.Office,
            
            // Office文档 - PowerPoint
            ".ppt" or ".pptx" or ".pptm" or ".potx" or ".potm" or ".ppsx" or ".ppsm" or ".odp" 
                => PreviewType.Office,
            
            // 代码/文本文件
            ".html" or ".htm" or ".css" or ".js" or ".ts" or ".jsx" or ".tsx" or ".json" or 
            ".xml" or ".cs" or ".java" or ".py" or ".rb" or ".php" or ".go" or ".rs" or 
            ".sql" or ".sh" or ".bash" or ".ps1" or ".yaml" or ".yml" or ".md" or ".vue" or 
            ".razor" or ".cpp" or ".cc" or ".c" or ".swift" or ".kt" or ".dart" or ".r" or 
            ".scala" or ".dockerfile" or ".txt" or ".log" or ".config" or ".ini" or ".env" or
            ".gitignore" or ".editorconfig" or ".prettierrc" or ".eslintrc" or ".babelrc" or
            ".csproj" or ".sln" or ".props" or ".targets"
                => PreviewType.Code,
            
            // 压缩文件和其他二进制文件
            ".zip" or ".rar" or ".7z" or ".tar" or ".gz" or ".exe" or ".dll" or ".so" or ".bin"
                => PreviewType.Unknown,
            
            // 默认尝试作为代码/文本处理
            _ => PreviewType.Code
        };
    }

    /// <summary>
    /// 获取文件类型图标
    /// </summary>
    private string GetFileTypeIcon()
    {
        var extension = System.IO.Path.GetExtension(_fileName).ToLower();
        return FileIconHelper.GetLargeFileIcon(extension);
    }

    /// <summary>
    /// 获取标签颜色类
    /// </summary>
    private string GetLabelColorClass()
    {
        var extension = System.IO.Path.GetExtension(_fileName).ToLower();
        
        return extension switch
        {
            ".doc" or ".docx" or ".docm" or ".dotx" or ".dotm" or ".odt" => "bg-blue-600",
            ".xls" or ".xlsx" or ".xlsm" or ".xlsb" or ".xltx" or ".xltm" or ".csv" or ".ods" => "bg-green-600",
            ".ppt" or ".pptx" or ".pptm" or ".potx" or ".potm" or ".ppsx" or ".ppsm" or ".odp" => "bg-orange-500",
            ".pdf" => "bg-red-500",
            ".png" or ".jpg" or ".jpeg" or ".gif" or ".webp" or ".bmp" or ".svg" or ".ico" => "bg-pink-500",
            _ => "bg-gray-900"
        };
    }

    /// <summary>
    /// 获取Office类型图标
    /// </summary>
    private string GetOfficeTypeIcon()
    {
        var extension = System.IO.Path.GetExtension(_fileName).ToLower();
        
        return extension switch
        {
            ".doc" or ".docx" or ".docm" or ".dotx" or ".dotm" or ".odt" =>
                "<svg class=\"w-4 h-4 text-blue-600\" fill=\"currentColor\" viewBox=\"0 0 24 24\"><path d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6z\"/></svg>",
            
            ".xls" or ".xlsx" or ".xlsm" or ".xlsb" or ".xltx" or ".xltm" or ".csv" or ".ods" =>
                "<svg class=\"w-4 h-4 text-green-600\" fill=\"currentColor\" viewBox=\"0 0 24 24\"><path d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6z\"/></svg>",
            
            ".ppt" or ".pptx" or ".pptm" or ".potx" or ".potm" or ".ppsx" or ".ppsm" or ".odp" =>
                "<svg class=\"w-4 h-4 text-orange-600\" fill=\"currentColor\" viewBox=\"0 0 24 24\"><path d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8l-6-6z\"/></svg>",
            
            _ => "<svg class=\"w-4 h-4 text-gray-600\" fill=\"none\" stroke=\"currentColor\" viewBox=\"0 0 24 24\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M7 21h10a2 2 0 002-2V9.414a1 1 0 00-.293-.707l-5.414-5.414A1 1 0 0012.586 3H7a2 2 0 00-2 2v14a2 2 0 002 2z\"></path></svg>"
        };
    }

    /// <summary>
    /// 获取Office标签
    /// </summary>
    private string GetOfficeLabel(string extension)
    {
        return extension.ToLower() switch
        {
            ".doc" or ".docx" or ".docm" or ".dotx" or ".dotm" => "Word",
            ".odt" => "ODT",
            ".xls" or ".xlsx" or ".xlsm" or ".xlsb" or ".xltx" or ".xltm" => "Excel",
            ".csv" => "CSV",
            ".ods" => "ODS",
            ".ppt" or ".pptx" or ".pptm" or ".potx" or ".potm" or ".ppsx" or ".ppsm" => "PowerPoint",
            ".odp" => "ODP",
            _ => extension.TrimStart('.').ToUpper()
        };
    }

    /// <summary>
    /// 获取图片标签
    /// </summary>
    private string GetImageLabel(string extension)
    {
        return extension.ToLower() switch
        {
            ".png" => "PNG",
            ".jpg" or ".jpeg" => "JPEG",
            ".gif" => "GIF",
            ".webp" => "WebP",
            ".bmp" => "BMP",
            ".svg" => "SVG",
            ".ico" => "ICO",
            _ => "Image"
        };
    }

    private void Close()
    {
        _isVisible = false;
        _imageDataUrl = string.Empty;
        _pdfDataUrl = string.Empty;
        _officePreviewUrl = string.Empty;
        _officePreviewError = string.Empty;
        StateHasChanged();
    }

    private void HandleBackdropClick()
    {
        Close();
    }

    private async Task CopyCode()
    {
        try
        {
            // 使用统一的剪贴板函数（含回退方案）
            var success = await JSRuntime.InvokeAsync<bool>("clipboardCopy.copyText", _fileContent);
            if (success)
            {
                _copied = true;
                StateHasChanged();

                // 2秒后恢复按钮文本
                await Task.Delay(2000);
                _copied = false;
                StateHasChanged();
            }
            else
            {
                Console.WriteLine("复制失败：剪贴板操作返回 false");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"复制失败: {ex.Message}");
        }
    }

    private async Task DownloadFile()
    {
        try
        {
            if (_fileBytes != null)
            {
                var base64 = Convert.ToBase64String(_fileBytes);
                var mimeType = GetMimeType(System.IO.Path.GetExtension(_fileName));
                await JSRuntime.InvokeVoidAsync("downloadBase64File", _fileName, base64, mimeType);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"下载失败: {ex.Message}");
        }
    }

    private string CalculateFileSize(int byteCount)
    {
        if (byteCount < 1024)
            return $"{byteCount} B";
        else if (byteCount < 1024 * 1024)
            return $"{byteCount / 1024.0:F2} KB";
        else
            return $"{byteCount / (1024.0 * 1024.0):F2} MB";
    }

    private (string language, string label) GetLanguageFromExtension(string extension)
    {
        return extension switch
        {
            ".html" or ".htm" => ("html", "HTML"),
            ".css" => ("css", "CSS"),
            ".js" => ("javascript", "JavaScript"),
            ".ts" => ("typescript", "TypeScript"),
            ".jsx" => ("jsx", "JSX"),
            ".tsx" => ("tsx", "TSX"),
            ".json" => ("json", "JSON"),
            ".xml" => ("xml", "XML"),
            ".cs" => ("csharp", "C#"),
            ".java" => ("java", "Java"),
            ".py" => ("python", "Python"),
            ".rb" => ("ruby", "Ruby"),
            ".php" => ("php", "PHP"),
            ".go" => ("go", "Go"),
            ".rs" => ("rust", "Rust"),
            ".sql" => ("sql", "SQL"),
            ".sh" or ".bash" => ("bash", "Bash"),
            ".ps1" => ("powershell", "PowerShell"),
            ".yaml" or ".yml" => ("yaml", "YAML"),
            ".md" => ("markdown", "Markdown"),
            ".vue" => ("markup", "Vue"),
            ".razor" => ("cshtml", "Razor"),
            ".cpp" or ".cc" => ("cpp", "C++"),
            ".c" => ("c", "C"),
            ".swift" => ("swift", "Swift"),
            ".kt" => ("kotlin", "Kotlin"),
            ".dart" => ("dart", "Dart"),
            ".r" => ("r", "R"),
            ".scala" => ("scala", "Scala"),
            ".dockerfile" => ("docker", "Docker"),
            _ => ("plaintext", "Text")
        };
    }

    private string GetMimeType(string extension)
    {
        return extension.ToLower() switch
        {
            ".html" or ".htm" => "text/html",
            ".css" => "text/css",
            ".js" => "text/javascript",
            ".json" => "application/json",
            ".xml" => "application/xml",
            ".txt" => "text/plain",
            ".md" => "text/markdown",
            ".png" => "image/png",
            ".jpg" or ".jpeg" => "image/jpeg",
            ".gif" => "image/gif",
            ".webp" => "image/webp",
            ".bmp" => "image/bmp",
            ".svg" => "image/svg+xml",
            ".ico" => "image/x-icon",
            ".pdf" => "application/pdf",
            ".doc" => "application/msword",
            ".docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
            ".xls" => "application/vnd.ms-excel",
            ".xlsx" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            ".ppt" => "application/vnd.ms-powerpoint",
            ".pptx" => "application/vnd.openxmlformats-officedocument.presentationml.presentation",
            ".csv" => "text/csv",
            ".zip" => "application/zip",
            ".rar" => "application/x-rar-compressed",
            ".7z" => "application/x-7z-compressed",
            _ => "application/octet-stream"
        };
    }

    /// <summary>
    /// 将内部 PreviewType 转换为 FilePreviewPanel.FilePreviewType
    /// </summary>
    private FilePreviewPanel.FilePreviewType ConvertToFilePreviewType(PreviewType type)
    {
        return type switch
        {
            PreviewType.Code => FilePreviewPanel.FilePreviewType.Code,
            PreviewType.Image => FilePreviewPanel.FilePreviewType.Image,
            PreviewType.Pdf => FilePreviewPanel.FilePreviewType.Pdf,
            PreviewType.Office => FilePreviewPanel.FilePreviewType.Unknown, // Office 类型需要特殊处理
            PreviewType.Unknown => FilePreviewPanel.FilePreviewType.Unknown,
            _ => FilePreviewPanel.FilePreviewType.None
        };
    }
}