From e9003542325307d39428233db7cde11bbab7be05 Mon Sep 17 00:00:00 2001
From: ngfchl <ngfchl@126.comn>
Date: Sat, 18 Jul 2026 11:36:23 +0800
Subject: [PATCH] feat: add batch rename rule engine

---
 lib/models/batch_rename.dart | 134 +++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 lib/models/batch_rename.dart

diff --git a/lib/models/batch_rename.dart b/lib/models/batch_rename.dart
new file mode 100644
index 0000000..57bd1be
--- /dev/null
+++ b/lib/models/batch_rename.dart
@@ -0,0 +1,134 @@
+import 'cloud_file.dart';
+
+enum BatchRenameRuleKind { remove, replace, regex, prefix, suffix }
+
+class BatchRenameRule {
+  final String id;
+  final bool enabled;
+  final BatchRenameRuleKind kind;
+  final String pattern;
+  final String replacement;
+  final bool ignoreCase;
+
+  const BatchRenameRule({
+    required this.id,
+    this.enabled = true,
+    this.kind = BatchRenameRuleKind.replace,
+    this.pattern = '',
+    this.replacement = '',
+    this.ignoreCase = false,
+  });
+
+  BatchRenameRule copyWith({
+    bool? enabled,
+    BatchRenameRuleKind? kind,
+    String? pattern,
+    String? replacement,
+    bool? ignoreCase,
+  }) => BatchRenameRule(
+    id: id,
+    enabled: enabled ?? this.enabled,
+    kind: kind ?? this.kind,
+    pattern: pattern ?? this.pattern,
+    replacement: replacement ?? this.replacement,
+    ignoreCase: ignoreCase ?? this.ignoreCase,
+  );
+
+  String apply(String value) {
+    if (!enabled) return value;
+    switch (kind) {
+      case BatchRenameRuleKind.remove:
+        return pattern.isEmpty
+            ? value
+            : value.replaceAll(
+                RegExp(RegExp.escape(pattern), caseSensitive: !ignoreCase),
+                '',
+              );
+      case BatchRenameRuleKind.replace:
+        return pattern.isEmpty
+            ? value
+            : value.replaceAll(
+                RegExp(RegExp.escape(pattern), caseSensitive: !ignoreCase),
+                replacement,
+              );
+      case BatchRenameRuleKind.regex:
+        return pattern.isEmpty
+            ? value
+            : value.replaceAll(
+                RegExp(pattern, caseSensitive: !ignoreCase),
+                replacement,
+              );
+      case BatchRenameRuleKind.prefix:
+        return '$pattern$value';
+      case BatchRenameRuleKind.suffix:
+        return '$value$pattern';
+    }
+  }
+}
+
+class BatchRenamePreview {
+  final CloudFile file;
+  final String newName;
+  final String? error;
+
+  const BatchRenamePreview({
+    required this.file,
+    required this.newName,
+    this.error,
+  });
+  bool get changed => file.name != newName;
+  bool get applicable => changed && error == null;
+}
+
+List<BatchRenamePreview> buildRenamePreviews(
+  List<CloudFile> files,
+  List<BatchRenameRule> rules, {
+  required bool preserveExtension,
+}) {
+  final values = <BatchRenamePreview>[];
+  for (final file in files) {
+    try {
+      final dot = !file.isDirectory && preserveExtension
+          ? file.name.lastIndexOf('.')
+          : -1;
+      final base = dot > 0 ? file.name.substring(0, dot) : file.name;
+      final extension = dot > 0 ? file.name.substring(dot) : '';
+      final renamed =
+          rules.fold(base, (value, rule) => rule.apply(value)) + extension;
+      final trimmed = renamed.trim();
+      values.add(
+        BatchRenamePreview(
+          file: file,
+          newName: renamed,
+          error:
+              trimmed.isEmpty ||
+                  renamed.contains('/') ||
+                  renamed.contains('\u0000')
+              ? '名称包含非法字符或为空'
+              : null,
+        ),
+      );
+    } on FormatException {
+      values.add(
+        BatchRenamePreview(file: file, newName: file.name, error: '正则表达式无效'),
+      );
+    }
+  }
+  final proposed = <String, int>{};
+  for (final item in values.where((item) => item.applicable)) {
+    final key =
+        '${item.file.cloudPath.toLowerCase()}/${item.newName.toLowerCase()}';
+    proposed[key] = (proposed[key] ?? 0) + 1;
+  }
+  return values.map((item) {
+    final key =
+        '${item.file.cloudPath.toLowerCase()}/${item.newName.toLowerCase()}';
+    return proposed[key] != null && proposed[key]! > 1
+        ? BatchRenamePreview(
+            file: item.file,
+            newName: item.newName,
+            error: '规则产生同名项目',
+          )
+        : item;
+  }).toList();
+}