86 lines
2.5 KiB
Dart
86 lines
2.5 KiB
Dart
// lib/metadata/metadata_service.dart
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// ⭐ 移除未使用的 import 'dart:io';
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import 'package:flutter/foundation.dart'; // ⭐ 添加
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import 'metadata_model.dart';
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import 'metadata_reader.dart';
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import 'metadata_normalizer.dart';
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import 'metadata_cache.dart';
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import 'file_provider.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 MetadataReader _reader = MetadataReader();
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final MetadataNormalizer _normalizer = MetadataNormalizer();
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final MetadataCache _cache = MetadataCache();
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FileProvider _getProvider(String url) {
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if (url.startsWith('http://') || url.startsWith('https://')) {
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return WebDAVFileProvider();
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}
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return LocalFileProvider();
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}
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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
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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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debugPrint('📦 [MetadataService] cache hit: ${cached.title}');
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return cached;
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}
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}
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// 2. 获取文件
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final provider = _getProvider(url);
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final file = await provider.getFile(url);
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if (file == null || !await file.exists()) {
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debugPrint(
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'⚠️ [MetadataService] file not available, using filename fallback');
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return _fallbackFromFileName(fileName);
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}
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// 3. 读取 metadata
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final raw = await _reader.readRawMetadata(file);
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// 4. 标准化
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final normalized = _normalizer.normalize(
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raw,
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fileName: fileName,
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filePath: url,
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);
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// 5. 评估（第一阶段：直接接受）
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final history = await _cache.getHistory(normalized.artist, limit: 10);
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final candidate = _normalizer.evaluate(normalized, history);
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final finalMetadata = _normalizer.decide(candidate);
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// 6. 缓存
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if (finalMetadata.isNotEmpty) {
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await _cache.put(fileId, finalMetadata);
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debugPrint(
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'✅ [MetadataService] metadata saved: ${finalMetadata.title} - ${finalMetadata.artist}');
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}
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return finalMetadata;
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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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