import 'package:flutter/foundation.dart';
import '../models/document.dart';
import '../services/mock_data_service.dart';

/// 文档状态管理
class DocumentProvider with ChangeNotifier {
  List<Document> _documents = [];
  Document? _selectedDocument;
  bool _loading = false;

  List<Document> get documents => _documents;
  Document? get selectedDocument => _selectedDocument;
  bool get loading => _loading;

  DocumentProvider() {
    loadDocuments();
  }

  /// 加载文档列表
  Future<void> loadDocuments() async {
    _loading = true;
    notifyListeners();

    // 模拟网络请求
    await Future.delayed(const Duration(milliseconds: 500));

    _documents = MockDataService.getMockDocuments();
    _loading = false;
    notifyListeners();
  }

  /// 选择文档
  void selectDocument(Document document) {
    _selectedDocument = document;
    notifyListeners();
  }

  /// 添加文档
  void addDocument(Document document) {
    _documents.insert(0, document);
    notifyListeners();
  }

  /// 更新文档
  void updateDocument(Document document) {
    final index = _documents.indexWhere((d) => d.id == document.id);
    if (index != -1) {
      _documents[index] = document;
      notifyListeners();
    }
  }

  /// 删除文档
  void deleteDocument(String id) {
    _documents.removeWhere((d) => d.id == id);
    if (_selectedDocument?.id == id) {
      _selectedDocument = null;
    }
    notifyListeners();
  }

  /// 根据ID获取文档
  Document? getDocumentById(String id) {
    try {
      return _documents.firstWhere((d) => d.id == id);
    } catch (e) {
      return null;
    }
  }
}