48 lines
1.3 KiB
Dart
48 lines
1.3 KiB
Dart
// lib/metadata/metadata_service.dart
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import 'metadata_model.dart';
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import 'metadata_cache.dart';
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class MetadataService {
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static final MetadataService _instance = MetadataService._internal();
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factory MetadataService() => _instance;
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MetadataService._internal();
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final MetadataCache _cache = MetadataCache();
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/// 临时版本：不进行实际文件读取，只返回基于文件名的 fallback
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Future<FinalMetadata> getMetadata({
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required String url,
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required String fileName,
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required String fileId,
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bool forceRefresh = false,
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}) async {
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// 1. 检查缓存（如果有）
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if (!forceRefresh) {
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final cached = await _cache.get(fileId);
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if (cached != null && cached.isNotEmpty) {
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return cached;
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}
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}
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// 2. 暂时不读取文件，直接 fallback
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final fallback = _fallbackFromFileName(fileName);
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// 3. 缓存结果（即使 fallback 也缓存，避免频繁调用）
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if (fallback.isNotEmpty) {
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await _cache.put(fileId, fallback);
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}
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return fallback;
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}
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FinalMetadata _fallbackFromFileName(String fileName) {
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final dotIndex = fileName.lastIndexOf('.');
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final title = dotIndex > 0 ? fileName.substring(0, dotIndex) : fileName;
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return FinalMetadata(
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title: title,
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artist: '未知艺术家',
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source: 'filename',
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);
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}
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}
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