worldhopper/lib/services/image_cache_service.dart

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/foundation.dart';
import 'package:path_provider/path_provider.dart';

/// Service for caching publication cover images locally
class ImageCacheService {
  final Directory _imageDirectory;

  ImageCacheService(this._imageDirectory);

  static Future<ImageCacheService> create() async {
    final appDir = await getApplicationDocumentsDirectory();
    final imageDir = Directory('${appDir.path}/images');

    // Create subdirectories
    await Directory('${imageDir.path}/covers').create(recursive: true);
    await Directory('${imageDir.path}/thumbnails').create(recursive: true);

    return ImageCacheService(imageDir);
  }

  /// Download and cache a cover image
  Future<String?> cacheCoverImage(String publicationId, String imageUrl) async {
    try {
      final dio = Dio();
      final response = await dio.get(
        imageUrl,
        options: Options(responseType: ResponseType.bytes),
      );

      if (response.statusCode != 200) return null;

      final file = File('${_imageDirectory.path}/covers/$publicationId.jpg');
      await file.writeAsBytes(response.data as List<int>);

      return file.path;
    } catch (e) {
      debugPrint('Error caching cover: $e');
      return null;
    }
  }

  /// Download and cache a thumbnail image
  Future<String?> cacheThumbnailImage(
      String publicationId, String imageUrl) async {
    try {
      final dio = Dio();
      final response = await dio.get(
        imageUrl,
        options: Options(responseType: ResponseType.bytes),
      );

      if (response.statusCode != 200) return null;

      final file =
          File('${_imageDirectory.path}/thumbnails/$publicationId.jpg');
      await file.writeAsBytes(response.data as List<int>);

      return file.path;
    } catch (e) {
      debugPrint('Error caching thumbnail: $e');
      return null;
    }
  }

  /// Check if a local image file exists
  bool hasLocalImage(String? path) {
    if (path == null) return false;
    return File(path).existsSync();
  }

  /// Delete cached images for a publication
  Future<void> deleteCachedImages(String publicationId) async {
    final coverFile = File('${_imageDirectory.path}/covers/$publicationId.jpg');
    final thumbFile =
        File('${_imageDirectory.path}/thumbnails/$publicationId.jpg');

    if (await coverFile.exists()) await coverFile.delete();
    if (await thumbFile.exists()) await thumbFile.delete();
  }

  /// Get cache directory size in bytes
  Future<int> getCacheSize() async {
    int totalSize = 0;

    await for (final entity in _imageDirectory.list(recursive: true)) {
      if (entity is File) {
        totalSize += await entity.length();
      }
    }

    return totalSize;
  }
}