import '../datasources/local/folder_dao.dart';
import '../models/hive_image_folder.dart';
import '../../domain/entities/image_folder.dart';
import 'folder_repository.dart';

/// 文件夹仓库实现类 - 基于Hive数据库的文件夹操作实现
/// 负责处理文件夹数据的持久化存储和检索
class FolderRepositoryImpl implements FolderRepository {
  final FolderDao _folderDao;

  FolderRepositoryImpl(this._folderDao);

  @override
  Future<List<ImageFolder>> getAllFolders() async {
    try {
      final folders = await _folderDao.getAllFolders();
      return folders;
    } catch (e) {
      throw Exception('获取文件夹列表失败: $e');
    }
  }

  @override
  Future<ImageFolder?> getFolderById(String id) async {
    try {
      final folder = await _folderDao.getFolderById(id);
      return folder;
    } catch (e) {
      throw Exception('获取文件夹失败: $e');
    }
  }

  @override
  Future<String> createFolder({
    required String name,
    required String icon,
    String? coverImageId,
  }) async {
    try {
      final now = DateTime.now();
      final hiveFolder = HiveImageFolder(
        id: _generateId(),
        name: name,
        coverImageId: coverImageId,
        icon: icon,
        createdAt: now,
        updatedAt: now,
        lastUsedAt: now,
      );

      await _folderDao.insertHiveFolder(hiveFolder);
      return hiveFolder.id;
    } catch (e) {
      throw Exception('创建文件夹失败: $e');
    }
  }

  @override
  Future<void> updateFolder({
    required String id,
    required String name,
    required String icon,
    String? coverImageId,
  }) async {
    try {
      final existingFolder = await _folderDao.getHiveFolderById(id);
      if (existingFolder == null) {
        throw Exception('文件夹不存在');
      }

      final updatedFolder = HiveImageFolder(
        id: id,
        name: name,
        coverImageId: coverImageId,
        icon: icon,
        createdAt: existingFolder.createdAt,
        updatedAt: DateTime.now(),
        lastUsedAt: existingFolder.lastUsedAt,
      );

      await _folderDao.updateHiveFolder(updatedFolder);
    } catch (e) {
      throw Exception('更新文件夹失败: $e');
    }
  }

  @override
  Future<void> deleteFolder(String id) async {
    try {
      await _folderDao.deleteFolder(id);
    } catch (e) {
      throw Exception('删除文件夹失败: $e');
    }
  }

  @override
  Future<void> updateFolderLastUsed(String id) async {
    try {
      final existingFolder = await _folderDao.getHiveFolderById(id);
      if (existingFolder == null) {
        throw Exception('文件夹不存在');
      }

      final updatedFolder = HiveImageFolder(
        id: id,
        name: existingFolder.name,
        coverImageId: existingFolder.coverImageId,
        icon: existingFolder.icon,
        createdAt: existingFolder.createdAt,
        updatedAt: DateTime.now(),
        lastUsedAt: DateTime.now(),
      );

      await _folderDao.updateHiveFolder(updatedFolder);
    } catch (e) {
      throw Exception('更新文件夹使用时间失败: $e');
    }
  }

  @override
  Future<int> getFolderImageCount(String id) async {
    try {
      // 这里需要实现获取文件夹中图片数量的逻辑
      // 可能需要调用ImageDAO的相关方法
      // 暂时返回0，后续实现
      return 0;
    } catch (e) {
      throw Exception('获取文件夹图片数量失败: $e');
    }
  }

  @override
  Future<List<ImageFolder>> getRecentFolders({int limit = 10}) async {
    try {
      final folders = await _folderDao.getRecentFolders(limit: limit);
      return folders;
    } catch (e) {
      throw Exception('获取最近使用的文件夹失败: $e');
    }
  }

  @override
  Future<List<ImageFolder>> searchFolders(String keyword) async {
    try {
      final folders = await _folderDao.searchFolders(keyword);
      return folders;
    } catch (e) {
      throw Exception('搜索文件夹失败: $e');
    }
  }

  /// 生成唯一ID
  String _generateId() {
    return DateTime.now().millisecondsSinceEpoch.toString() +
        _generateRandomString(8);
  }

  /// 生成随机字符串
  String _generateRandomString(int length) {
    const chars = 'abcdefghijklmnopqrstuvwxyz0123456789';
    final random = DateTime.now().millisecondsSinceEpoch;
    String result = '';
    for (int i = 0; i < length; i++) {
      result += chars[(random + i) % chars.length];
    }
    return result;
  }
}