lib/data/file_storage.dart - develop - siblun/ReadFlow

lib/data/file_storage.dart
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siblun
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21 апр 2026, 16:13
21 апр 2026, 16:13c40d018
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';
import 'package:uuid/uuid.dart';

abstract class FileStorage {
  Future<String> saveImage(Uint8List bytes, String fileName);
  Future<void> deleteImage(String path);
  Future<bool> exists(String path);
  Future<File?> getFile(String path);
}

/// Реализация [FileStorage] для работы с локальной директорией Documents.
///
/// Автоматически создает папку 'covers' и генерирует уникальные имена файлов
/// для предотвращения коллизий.
class LocalFileStorage implements FileStorage {
  final Uuid _uuid = const Uuid();

  @override
  Future<void> deleteImage(String path) async {
    final dir = await getApplicationDocumentsDirectory();
    final file = File('${dir.path}/$path');

    if (await file.exists()){
      await file.delete();
    }
  }

  @override
  Future<bool> exists(String path) async{
    final dir = await getApplicationDocumentsDirectory();
    final file = File('${dir.path}/$path');
    return await file.exists();
  }

  @override
  Future<String> saveImage(Uint8List bytes, String fileName) async {
    final dir = await getApplicationDocumentsDirectory();

    final coversDir = Directory('${dir.path}/covers');
    if (!await coversDir.exists()) {
      await coversDir.create(recursive: true);
    }

    final uniqueName = '${_uuid.v4()}_$fileName';
    final file = File('${coversDir.path}/$uniqueName');

    await file.writeAsBytes(bytes);
    return 'covers/$uniqueName';
  }

  @override
  Future<File?> getFile(String path) async {
    try {
      final dir = await getApplicationDocumentsDirectory();
      final file = File('${dir.path}/$path');

      if (await file.exists()) {
        final stat = await file.stat();
        if (stat.size > 0) {
          return file;
        }
      }
      return null;
    } catch (e) {
      debugPrint('Error loading file $path: $e');
      return null;
    }
  }
}