app/lib/core/utils/file_utils.dart

/// 文件工具类
class FileUtils {
  /// 将路径转换为 Cloudreve URI 格式
  /// "/" → "cloudreve://my", "/subfolder" → "cloudreve://my/subfolder"
  static String toCloudreveUri(String path) {
    if (path.startsWith('cloudreve://')) return path;
    if (path == '/' || path.isEmpty) return 'cloudreve://my';
    final cleanPath = path.startsWith('/') ? path.substring(1) : path;
    return 'cloudreve://my/$cleanPath';
  }

  static String toCloudreveUriWithQuery(
    String path,
    Map<String, Object?> queryParameters,
  ) {
    final baseUri = toCloudreveUri(path);
    final filteredQuery = <String, String>{};

    for (final entry in queryParameters.entries) {
      final value = entry.value;
      if (value != null) {
        filteredQuery[entry.key] = value.toString();
      }
    }

    if (filteredQuery.isEmpty) return baseUri;

    final query = Uri(queryParameters: filteredQuery).query;
    final separator = baseUri.contains('?') ? '&' : '?';
    return '$baseUri$separator$query';
  }

  static String toRelativePath(String path) {
    const prefix = 'cloudreve://my';
    if (!path.startsWith(prefix)) {
      return path.isEmpty ? '/' : path;
    }

    var relative = path.substring(prefix.length);
    final queryIndex = relative.indexOf('?');
    if (queryIndex != -1) {
      relative = relative.substring(0, queryIndex);
    }

    return relative.isEmpty ? '/' : relative;
  }

  static String decodePathForDisplay(String path) {
    final relativePath = toRelativePath(path);
    return relativePath.split('/').map(decodePathSegment).join('/');
  }

  static String decodePathSegment(String value) {
    var decoded = value;

    for (var i = 0; i < 5; i++) {
      try {
        final next = Uri.decodeComponent(decoded);
        if (next == decoded) break;
        decoded = next;
      } on FormatException {
        break;
      }
    }

    return decoded;
  }

  /// 获取文件扩展名
  static String getFileExtension(String fileName) {
    final dotIndex = fileName.lastIndexOf('.');
    if (dotIndex == -1) return '';
    return fileName.substring(dotIndex + 1).toLowerCase();
  }

  /// 判断是否为图片文件
  static bool isImageFile(String fileName) {
    const imageExtensions = [
      'jpg',
      'jpeg',
      'png',
      'gif',
      'webp',
      'bmp',
      'svg',
      'heic',
    ];
    return imageExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为视频文件
  static bool isVideoFile(String fileName) {
    const videoExtensions = ['mp4', 'webm', 'mkv', 'avi', 'mov', 'flv', 'wmv'];
    return videoExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为音频文件
  static bool isAudioFile(String fileName) {
    const audioExtensions = ['mp3', 'wav', 'ogg', 'flac', 'aac', 'm4a'];
    return audioExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为PDF文件
  static bool isPdfFile(String fileName) {
    return getFileExtension(fileName) == 'pdf';
  }

  /// 判断是否为文本文件
  static bool isTextFile(String fileName) {
    const textExtensions = [
      'txt',
      'md',
      'json',
      'xml',
      'yaml',
      'yml',
      'ini',
      'conf',
    ];
    return textExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为代码文件
  static bool isCodeFile(String fileName) {
    const codeExtensions = [
      'js',
      'ts',
      'tsx',
      'jsx',
      'dart',
      'java',
      'py',
      'c',
      'cpp',
      'h',
      'hpp',
      'cs',
      'php',
      'rb',
      'go',
      'rs',
      'swift',
      'kt',
      'html',
      'css',
      'scss',
      'less',
      'sql',
      'sh',
      'bat',
    ];
    return codeExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为压缩文件
  static bool isArchiveFile(String fileName) {
    const archiveExtensions = ['zip', 'rar', '7z', 'tar', 'gz', 'bz2'];
    return archiveExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否为文档文件
  static bool isDocumentFile(String fileName) {
    const docExtensions = [
      'doc',
      'docx',
      'xls',
      'xlsx',
      'ppt',
      'pptx',
      'odt',
      'ods',
      'odp',
    ];
    return docExtensions.contains(getFileExtension(fileName));
  }

  /// 判断是否可预览
  static bool isPreviewable(String fileName) {
    return isImageFile(fileName) ||
        isVideoFile(fileName) ||
        isPdfFile(fileName) ||
        isTextFile(fileName) ||
        isCodeFile(fileName);
  }

  /// 获取MIME类型
  static String getMimeType(String fileName) {
    final ext = getFileExtension(fileName);
    final mimeTypes = {
      'jpg': 'image/jpeg',
      'jpeg': 'image/jpeg',
      'png': 'image/png',
      'gif': 'image/gif',
      'webp': 'image/webp',
      'svg': 'image/svg+xml',
      'mp4': 'video/mp4',
      'webm': 'video/webm',
      'mkv': 'video/x-matroska',
      'avi': 'video/x-msvideo',
      'mp3': 'audio/mpeg',
      'wav': 'audio/wav',
      'ogg': 'audio/ogg',
      'pdf': 'application/pdf',
      'txt': 'text/plain',
      'json': 'application/json',
      'xml': 'application/xml',
      'html': 'text/html',
      'css': 'text/css',
      'js': 'application/javascript',
    };
    return mimeTypes[ext] ?? 'application/octet-stream';
  }

  /// 获取文件图标
  static String getFileIcon(String fileName) {
    if (isImageFile(fileName)) return 'assets/icons/image.svg';
    if (isVideoFile(fileName)) return 'assets/icons/video.svg';
    if (isAudioFile(fileName)) return 'assets/icons/audio.svg';
    if (isPdfFile(fileName)) return 'assets/icons/pdf.svg';
    if (isTextFile(fileName)) return 'assets/icons/text.svg';
    if (isCodeFile(fileName)) return 'assets/icons/code.svg';
    if (isArchiveFile(fileName)) return 'assets/icons/archive.svg';
    if (isDocumentFile(fileName)) return 'assets/icons/document.svg';

    return 'assets/icons/file.svg';
  }
}