init

lib/viewmodels/bar_screen_view_model.dart

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+import 'package:flutter/foundation.dart';
+
+import '../models/bar_tab.dart';
+import '../models/product.dart';
+import '../models/tab_item.dart';
+import '../services/bar_tab_service.dart';
+import '../services/product_service.dart';
+
+class BarScreenViewModel extends ChangeNotifier {
+  final BarTabService barTabService;
+
+  BarScreenViewModel({
+    required this.barTabService,
+  });
+
+  List<BarTab> _tabs = [];
+  String? _selectedTabId;
+  bool _isLoading = false;
+  bool _hasLoaded = false;
+  String? _errorMessage;
+
+  List<BarTab> get tabs => _tabs;
+
+  String? get selectedTabId => _selectedTabId;
+
+  bool get isLoading => _isLoading;
+
+  bool get hasLoaded => _hasLoaded;
+
+  String? get errorMessage => _errorMessage;
+
+  BarTab? get selectedTab {
+    if (_selectedTabId == null) return null;
+
+    try {
+      return _tabs.firstWhere((tab) => tab.id == _selectedTabId);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Future<void> ensureLoaded() async {
+    if (_hasLoaded || _isLoading) return;
+
+    await load();
+  }
+
+  Future<void> load() async {
+    if (_isLoading) return;
+
+    _isLoading = true;
+    _errorMessage = null;
+    notifyListeners();
+
+    try {
+      _tabs = await barTabService.getOpenTabs();
+
+      if (_selectedTabId == null ||
+          !_tabs.any((tab) => tab.id == _selectedTabId)) {
+        _selectedTabId = _tabs.isEmpty ? null : _tabs.first.id;
+      }
+    } catch (_) {
+      _errorMessage = 'Could not load bar screen.';
+    } finally {
+      _hasLoaded = true;
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+
+  void selectTab(String tabId) {
+    _selectedTabId = tabId;
+    notifyListeners();
+  }
+
+  Future<void> createTab(String customerName) async {
+    final tab = await barTabService.createTab(
+      customerName: customerName,
+    );
+
+    _selectedTabId = tab.id;
+    await _reloadTabs();
+  }
+
+  Future<void> addProductToSelectedTab(Product product) async {
+    final tab = selectedTab;
+
+    if (tab == null) return;
+
+    await barTabService.addProductToTab(
+      tabId: tab.id,
+      product: product,
+    );
+
+    await _reloadTabs();
+  }
+
+  Future<void> changeItemQuantity(
+      TabItem item,
+      int quantity,
+      ) async {
+    await barTabService.updateTabItemQuantity(
+      tabItemId: item.id,
+      quantity: quantity,
+    );
+
+    await _reloadTabs();
+  }
+
+  Future<void> closeSelectedTab() async {
+    final tab = selectedTab;
+
+    if (tab == null) return;
+
+    await barTabService.closeTab(tab.id);
+
+    _selectedTabId = null;
+    await _reloadTabs();
+  }
+
+  Future<void> closeTab(String tabId) async {
+    await barTabService.closeTab(tabId);
+
+    if (_selectedTabId == tabId) {
+      _selectedTabId = null;
+    }
+
+    await _reloadTabs();
+  }
+
+  Future<void> _reloadTabs() async {
+    _tabs = await barTabService.getOpenTabs();
+
+    if (_selectedTabId == null || !_tabs.any((tab) => tab.id == _selectedTabId)) {
+      _selectedTabId = _tabs.isEmpty ? null : _tabs.first.id;
+    }
+
+    notifyListeners();
+  }
+}