flutter_appfx/lib/util/fileUtils.dart

import 'dart:io';
import 'dart:math';
import 'package:convert/convert.dart';
import 'package:crypto/crypto.dart';
import 'package:path/path.dart' as path;
import 'package:file_selector/file_selector.dart' as file_selector;
import 'package:path_provider/path_provider.dart';
import 'logger.dart';



String fileOrDirectoryName(FileSystemEntity directory) {
  return lastNameOfPath(directory.path);
}

String lastNameOfPath(path) {
  final paths = path.split(Platform.pathSeparator);
  return paths.last;
}

bool isDirectory(path) {
  return FileSystemEntity.isDirectorySync(path);
}

Future<bool> isDirectoryExists(path) {
  return Directory(path).exists();
}

Future<bool> isFileExists(path) {
  return File(path).exists();
}

bool isFile(path) {
  return FileSystemEntity.isFileSync(path);
}

Future<int> fileSizeOf(path) async {
  final file = File(path);
  final size = await file.length();
  return size;
}

String formatFileSize(int bytes) {
  if (bytes <= 0) return "0 B";
  const suffixes = ["B", "KB", "MB", "GB", "TB", "PB", "EB"];
  var i = (log(bytes) / log(1024)).floor();
  return ((bytes / pow(1024, i)).toStringAsFixed(2)) + ' ' + suffixes[i];
}

// MD5
Future<String> getFileMd5(String filePath) async {
  final fileExists = File(filePath).existsSync();
  if (!fileExists) throw FileSystemException("File does not exist", filePath);
  final file = File(filePath);
  final digest = await file.openRead().transform(md5).first;
  return hex.encode(digest.bytes);
}


createFolder(String folderPath) async {
  // 创建文件夹
  final Directory folder = Directory(folderPath);
  // 如果文件夹不存在，则创建
  if (!await folder.exists()) {
    await folder.create();
  } else {
    Log.d("Folder already exists");
  }
}

copyDirectory(Directory source, Directory destination) async {
  await for (var entity in source.list(recursive: false)) {
    if (entity is Directory) {
      var newDirectory = Directory(
          path.join(destination.absolute.path, path.basename(entity.path)));
      await newDirectory.create();
      await copyDirectory(entity.absolute, newDirectory);
    } else if (entity is File) {
      await entity.copy(
          path.join(destination.path, path.basename(entity.path)));
    }
  }
}

clearDirectory(Directory directory) async {
  // 列出所有文件和文件夹
  var files = directory.listSync();

  // 遍历文件和文件夹
  for (var fileEntity in files) {
    if (fileEntity is File) {
      // 文件直接删除
      await fileEntity.delete();
    } else if (fileEntity is Directory) {
      // 文件夹则递归删除
      await clearDirectory(fileEntity);
      await fileEntity.delete();
    }
  }
}

deleteDirectory(String path) async {
  final directory = Directory(path);
  await directory.delete(recursive: true);
}



Future<String?> getSaveLocation({String? suggestedName}) async {
  if (Platform.isIOS) {
    final directory = await getApplicationDocumentsDirectory();

    Log.d('iOS get file path: ${directory.path}/$suggestedName');

    return '${directory.path}/$suggestedName';

  } else {
    final file_selector.FileSaveLocation? selectedFile = await file_selector.getSaveLocation(
      suggestedName: suggestedName,
    );
    if (selectedFile != null) {
      return selectedFile.path;
    }
  }
  return null;
}