generated from dellevin/template
优化界面2
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DelLevin-Home
226
lib/utils/tag/tag_dao.dart
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226
lib/utils/tag/tag_dao.dart
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import 'dart:convert';
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import '../database_helper.dart';
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class TagDao {
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final DatabaseHelper _dbHelper = DatabaseHelper.instance;
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/// 获取指定类型的所有标签，按名称排序
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Future<List<Map<String, dynamic>>> getTagsByType(String type) async {
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final db = await _dbHelper.database;
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return await db.query('tags',
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where: 'type = ?',
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whereArgs: [type],
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orderBy: 'name ASC');
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}
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/// 根据ID获取标签
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Future<Map<String, dynamic>?> getTagById(String id) async {
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final db = await _dbHelper.database;
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final results = await db.query('tags', where: 'id = ?', whereArgs: [id]);
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return results.isNotEmpty ? results.first : null;
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}
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/// 添加标签，返回新标签ID
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Future<String> addTag(String name, String type) async {
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final db = await _dbHelper.database;
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final id = 'tag_${DateTime.now().millisecondsSinceEpoch}';
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await db.insert('tags', {
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'id': id,
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'name': name,
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'type': type,
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'created_at': DateTime.now().toIso8601String(),
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});
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return id;
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}
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/// 重命名标签，同时级联更新所有关联条目
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Future<bool> renameTag(String tagId, String newName) async {
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final db = await _dbHelper.database;
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final tag = await getTagById(tagId);
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if (tag == null) return false;
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final oldName = tag['name'] as String;
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final type = tag['type'] as String;
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if (oldName == newName) return true;
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// 检查新名称是否已存在同类型标签
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final existing = await db.query('tags',
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where: 'name = ? AND type = ? AND id != ?',
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whereArgs: [newName, type, tagId]);
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if (existing.isNotEmpty) return false;
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await db.update('tags', {'name': newName},
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where: 'id = ?', whereArgs: [tagId]);
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// 级联更新
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switch (type) {
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case 'movie_genre':
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await _cascadeRenameInMovies(oldName, newName);
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case 'book_genre':
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await _cascadeRenameInBooks(oldName, newName);
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case 'note_tag':
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await _cascadeRenameInNotes(oldName, newName);
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}
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return true;
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}
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/// 删除标签
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/// [replacementName] 不为 null 时，先将所有条目中的旧标签替换为新标签，再删除
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/// [replacementName] 为 null 时，从所有条目中移除该标签
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Future<void> deleteTag(String tagId, {String? replacementName}) async {
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final db = await _dbHelper.database;
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final tag = await getTagById(tagId);
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if (tag == null) return;
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final name = tag['name'] as String;
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final type = tag['type'] as String;
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if (replacementName != null && replacementName != name) {
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await _ensureTagExists(replacementName, type);
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switch (type) {
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case 'movie_genre':
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await _cascadeRenameInMovies(name, replacementName);
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case 'book_genre':
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await _cascadeRenameInBooks(name, replacementName);
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case 'note_tag':
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await _cascadeRenameInNotes(name, replacementName);
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}
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} else if (replacementName == null) {
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switch (type) {
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case 'movie_genre':
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await _cascadeDeleteFromMovies(name);
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case 'book_genre':
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await _cascadeDeleteFromBooks(name);
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case 'note_tag':
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await _cascadeDeleteFromNotes(name);
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}
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}
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await db.delete('tags', where: 'id = ?', whereArgs: [tagId]);
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}
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/// 确保标签存在（用于替换操作）
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Future<void> _ensureTagExists(String name, String type) async {
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final db = await _dbHelper.database;
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final existing = await db.query('tags',
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where: 'name = ? AND type = ?', whereArgs: [name, type]);
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if (existing.isEmpty) {
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await addTag(name, type);
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}
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}
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// ====== 级联重命名 ======
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Future<void> _cascadeRenameInMovies(String oldName, String newName) async {
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final db = await _dbHelper.database;
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final movies = await db.query('movies');
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for (final row in movies) {
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final genres = _parseList(row['genres']);
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if (genres.contains(oldName) && !genres.contains(newName)) {
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final updated = genres.map((g) => g == oldName ? newName : g).toList();
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await db.update('movies', {
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'genres': jsonEncode(updated),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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Future<void> _cascadeRenameInBooks(String oldName, String newName) async {
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final db = await _dbHelper.database;
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final books = await db.query('books');
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for (final row in books) {
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final genres = _parseList(row['genres']);
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if (genres.contains(oldName) && !genres.contains(newName)) {
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final updated = genres.map((g) => g == oldName ? newName : g).toList();
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await db.update('books', {
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'genres': jsonEncode(updated),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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Future<void> _cascadeRenameInNotes(String oldName, String newName) async {
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final db = await _dbHelper.database;
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final notes = await db.query('notes');
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for (final row in notes) {
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final tags = _parseList(row['tags']);
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if (tags.contains(oldName) && !tags.contains(newName)) {
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final updated = tags.map((t) => t == oldName ? newName : t).toList();
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await db.update('notes', {
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'tags': jsonEncode(updated),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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// ====== 级联删除 ======
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Future<void> _cascadeDeleteFromMovies(String tagName) async {
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final db = await _dbHelper.database;
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final movies = await db.query('movies');
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for (final row in movies) {
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final genres = _parseList(row['genres']);
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if (genres.contains(tagName)) {
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genres.removeWhere((g) => g == tagName);
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await db.update('movies', {
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'genres': jsonEncode(genres),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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Future<void> _cascadeDeleteFromBooks(String tagName) async {
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final db = await _dbHelper.database;
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final books = await db.query('books');
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for (final row in books) {
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final genres = _parseList(row['genres']);
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if (genres.contains(tagName)) {
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genres.removeWhere((g) => g == tagName);
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await db.update('books', {
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'genres': jsonEncode(genres),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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Future<void> _cascadeDeleteFromNotes(String tagName) async {
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final db = await _dbHelper.database;
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final notes = await db.query('notes');
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for (final row in notes) {
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final tags = _parseList(row['tags']);
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if (tags.contains(tagName)) {
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tags.removeWhere((t) => t == tagName);
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await db.update('notes', {
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'tags': jsonEncode(tags),
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'updated_at': DateTime.now().toIso8601String(),
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}, where: 'id = ?', whereArgs: [row['id']]);
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}
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}
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}
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/// 解析 JSON 字符串列表
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List<String> _parseList(dynamic data) {
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if (data == null) return [];
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if (data is List) return data.map((e) => e.toString()).toList();
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if (data is String) {
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if (data.isEmpty || data == '[]') return [];
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try {
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final decoded = jsonDecode(data);
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if (decoded is List) {
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return decoded.map((e) => e.toString()).toList();
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}
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} catch (_) {
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return data.split(',').map((s) => s.trim()).where((s) => s.isNotEmpty).toList();
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}
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}
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return [];
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}
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}
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