import 'dart:io';
import 'package:win_text_editor/frame/models/file_node.dart';

class FileService {
  /// 延时加载目录内容（不递归）
  static Future<List<FileNode>> listDirectory(String path, {int parentDepth = 0}) async {
    final directory = Directory(path);
    final List<FileNode> nodes = [];

    if (await directory.exists()) {
      final entities = directory.listSync();

      // 遍历目录实体并创建FileNode
      for (final entity in entities) {
        nodes.add(
          FileNode(
            name: entity.path.split(Platform.pathSeparator).last,
            path: entity.path,
            isDirectory: entity is Directory,
            depth: parentDepth + 1,
            children: [],
          ),
        );
      }

      // 排序：文件夹在前按字母排序，文件在后按字母排序
      nodes.sort((a, b) {
        if (a.isDirectory && !b.isDirectory) {
          return -1; // a是文件夹，b是文件，a排在前面
        } else if (!a.isDirectory && b.isDirectory) {
          return 1; // a是文件，b是文件夹，b排在前面
        } else {
          // 都是文件夹或都是文件时，按名称字母排序
          return a.name.compareTo(b.name);
        }
      });
    }

    return nodes;
  }

  /// 递归构建完整文件树（原方法保留备用）
  static Future<List<FileNode>> buildFileTree(String rootPath) async {
    final rootDirectory = Directory(rootPath);
    final List<FileNode> nodes = [];

    if (await rootDirectory.exists()) {
      final entities = rootDirectory.listSync();

      for (final entity in entities) {
        final node = FileNode(
          name: entity.path.split(Platform.pathSeparator).last,
          path: entity.path,
          isDirectory: entity is Directory,
        );

        if (entity is Directory) {
          node.children.addAll(await buildFileTree(entity.path));
        }

        nodes.add(node);
      }
    }

    return nodes;
  }

  static Future<String> readFile(String filePath) async {
    return await File(filePath).readAsString();
  }

  static Future<void> writeFile(String filePath, String content) async {
    await File(filePath).writeAsString(content);
  }
}