145 lines
3.3 KiB
Dart
145 lines
3.3 KiB
Dart
import 'package:flutter/foundation.dart';
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import '../models/bar_tab.dart';
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import '../models/product.dart';
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import '../models/tab_item.dart';
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import '../services/bar_tab_service.dart';
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import 'inventory_view_model.dart';
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class BarScreenViewModel extends ChangeNotifier {
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final BarTabService barTabService;
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final InventoryViewModel inventory;
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BarScreenViewModel({required this.barTabService, required this.inventory});
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List<BarTab> _tabs = [];
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String? _selectedTabId;
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bool _isLoading = false;
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bool _hasLoaded = false;
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String? _errorMessage;
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List<BarTab> get tabs => _tabs;
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String? get selectedTabId => _selectedTabId;
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bool get isLoading => _isLoading;
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bool get hasLoaded => _hasLoaded;
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String? get errorMessage => _errorMessage;
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BarTab? get selectedTab {
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if (_selectedTabId == null) return null;
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try {
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return _tabs.firstWhere((tab) => tab.id == _selectedTabId);
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} catch (_) {
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return null;
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}
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}
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Future<void> ensureLoaded() async {
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if (_hasLoaded || _isLoading) return;
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await load();
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}
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Future<void> load() async {
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if (_isLoading) return;
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_isLoading = true;
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_errorMessage = null;
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notifyListeners();
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try {
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_tabs = await barTabService.getOpenTabs();
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if (_selectedTabId == null ||
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!_tabs.any((tab) => tab.id == _selectedTabId)) {
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_selectedTabId = _tabs.isEmpty ? null : _tabs.first.id;
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}
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} catch (_) {
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_errorMessage = 'Could not load bar screen.';
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} finally {
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_hasLoaded = true;
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_isLoading = false;
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notifyListeners();
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}
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}
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void selectTab(String tabId) {
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_selectedTabId = tabId;
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notifyListeners();
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}
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Future<void> createTab(String customerName) async {
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final tab = await barTabService.createTab(customerName: customerName);
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_selectedTabId = tab.id;
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await _reloadTabs();
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}
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Future<void> addProductToSelectedTab(Product product) async {
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final tab = selectedTab;
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if (tab == null) return;
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if (product.stockQuantity <= 0) {
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throw Exception('Product is out of stock.');
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}
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await barTabService.addProductToTab(
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tabId: tab.id,
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product: product,
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stockAdjustment: () => inventory.decreaseStock(product.id, 1),
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);
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await _reloadTabs();
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}
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Future<void> changeItemQuantity(TabItem item, int quantity) async {
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final difference = quantity - item.quantity;
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await barTabService.updateTabItemQuantity(
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tabItemId: item.id,
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quantity: quantity,
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stockAdjustment: () async {
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if (difference > 0) {
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await inventory.decreaseStock(item.productId, difference);
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} else if (difference < 0) {
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await inventory.increaseStock(item.productId, -difference);
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}
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},
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);
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await _reloadTabs();
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}
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Future<void> closeSelectedTab() async {
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final tab = selectedTab;
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if (tab == null) return;
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await barTabService.closeTab(tab.id);
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await _reloadTabs();
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}
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Future<void> closeTab(String tabId) async {
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await barTabService.closeTab(tabId);
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await _reloadTabs();
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}
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Future<void> _reloadTabs() async {
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_tabs = await barTabService.getOpenTabs();
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if (_selectedTabId == null ||
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!_tabs.any((tab) => tab.id == _selectedTabId)) {
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_selectedTabId = _tabs.isEmpty ? null : _tabs.first.id;
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}
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notifyListeners();
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}
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}
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