import 'package:hive_ce/hive.dart';
import 'package:hive_ce_flutter/hive_flutter.dart';
import 'package:retail/core/constants/storage_constants.dart';
import 'package:retail/features/products/data/models/product_model.dart';
import 'package:retail/features/categories/data/models/category_model.dart';
import 'package:retail/features/home/data/models/cart_item_model.dart';
import 'package:retail/features/home/data/models/transaction_model.dart';
import 'package:retail/features/settings/data/models/app_settings_model.dart';

/// Hive database initialization and management
class HiveDatabase {
  static HiveDatabase? _instance;
  static HiveDatabase get instance => _instance ??= HiveDatabase._();

  HiveDatabase._();

  bool _isInitialized = false;

  /// Initialize Hive database
  Future<void> init() async {
    if (_isInitialized) {
      return;
    }

    try {
      // Initialize Hive for Flutter
      await Hive.initFlutter();

      // Register all type adapters
      _registerAdapters();

      // Open all boxes
      await _openBoxes();

      // Initialize default settings if needed
      await _initializeDefaults();

      _isInitialized = true;
    } catch (e) {
      throw Exception('Failed to initialize Hive database: $e');
    }
  }

  /// Register all Hive type adapters
  void _registerAdapters() {
    // Register only if not already registered
    if (!Hive.isAdapterRegistered(StorageConstants.productTypeId)) {
      Hive.registerAdapter(ProductModelAdapter());
    }
    if (!Hive.isAdapterRegistered(StorageConstants.categoryTypeId)) {
      Hive.registerAdapter(CategoryModelAdapter());
    }
    if (!Hive.isAdapterRegistered(StorageConstants.cartItemTypeId)) {
      Hive.registerAdapter(CartItemModelAdapter());
    }
    if (!Hive.isAdapterRegistered(StorageConstants.transactionTypeId)) {
      Hive.registerAdapter(TransactionModelAdapter());
    }
    if (!Hive.isAdapterRegistered(StorageConstants.appSettingsTypeId)) {
      Hive.registerAdapter(AppSettingsModelAdapter());
    }
  }

  /// Open all required boxes
  Future<void> _openBoxes() async {
    await Future.wait([
      Hive.openBox<ProductModel>(StorageConstants.productsBox),
      Hive.openBox<CategoryModel>(StorageConstants.categoriesBox),
      Hive.openBox<CartItemModel>(StorageConstants.cartBox),
      Hive.openBox<TransactionModel>(StorageConstants.transactionsBox),
      Hive.openBox<AppSettingsModel>(StorageConstants.settingsBox),
    ]);
  }

  /// Initialize default settings and seed data if first launch
  Future<void> _initializeDefaults() async {
    final settingsBox = Hive.box<AppSettingsModel>(StorageConstants.settingsBox);

    // Initialize default settings if not exists
    if (settingsBox.isEmpty) {
      await settingsBox.put(
        'app_settings',
        AppSettingsModel.defaultSettings(),
      );
    }
  }

  /// Get a specific box by name
  Box<T> getBox<T>(String boxName) {
    return Hive.box<T>(boxName);
  }

  /// Get products box
  Box<ProductModel> get productsBox =>
      Hive.box<ProductModel>(StorageConstants.productsBox);

  /// Get categories box
  Box<CategoryModel> get categoriesBox =>
      Hive.box<CategoryModel>(StorageConstants.categoriesBox);

  /// Get cart box
  Box<CartItemModel> get cartBox =>
      Hive.box<CartItemModel>(StorageConstants.cartBox);

  /// Get transactions box
  Box<TransactionModel> get transactionsBox =>
      Hive.box<TransactionModel>(StorageConstants.transactionsBox);

  /// Get settings box
  Box<AppSettingsModel> get settingsBox =>
      Hive.box<AppSettingsModel>(StorageConstants.settingsBox);

  /// Clear all data from all boxes (useful for logout or reset)
  Future<void> clearAllData() async {
    await Future.wait([
      productsBox.clear(),
      categoriesBox.clear(),
      cartBox.clear(),
      transactionsBox.clear(),
      // Don't clear settings
    ]);
  }

  /// Clear cart only
  Future<void> clearCart() async {
    await cartBox.clear();
  }

  /// Compact all boxes (optimize storage)
  Future<void> compactAll() async {
    await Future.wait([
      productsBox.compact(),
      categoriesBox.compact(),
      cartBox.compact(),
      transactionsBox.compact(),
      settingsBox.compact(),
    ]);
  }

  /// Close all boxes
  Future<void> closeAll() async {
    await Hive.close();
    _isInitialized = false;
  }

  /// Delete all boxes (complete database reset)
  Future<void> deleteAll() async {
    await Future.wait([
      Hive.deleteBoxFromDisk(StorageConstants.productsBox),
      Hive.deleteBoxFromDisk(StorageConstants.categoriesBox),
      Hive.deleteBoxFromDisk(StorageConstants.cartBox),
      Hive.deleteBoxFromDisk(StorageConstants.transactionsBox),
      Hive.deleteBoxFromDisk(StorageConstants.settingsBox),
    ]);
    _isInitialized = false;
  }

  /// Get database statistics
  Map<String, dynamic> getStatistics() {
    return {
      'products': productsBox.length,
      'categories': categoriesBox.length,
      'cartItems': cartBox.length,
      'transactions': transactionsBox.length,
      'isInitialized': _isInitialized,
    };
  }

  /// Check if database is initialized
  bool get isInitialized => _isInitialized;
}