84 lines
2.0 KiB
Dart
84 lines
2.0 KiB
Dart
import 'package:riverpod_annotation/riverpod_annotation.dart';
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import 'cart_provider.dart';
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import '../../../settings/presentation/providers/settings_provider.dart';
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part 'cart_total_provider.g.dart';
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/// Cart totals calculation provider
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@riverpod
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class CartTotal extends _$CartTotal {
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@override
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CartTotalData build() {
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final itemsAsync = ref.watch(cartProvider);
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final settingsAsync = ref.watch(settingsProvider);
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final items = itemsAsync.when(
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data: (data) => data,
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loading: () => <dynamic>[],
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error: (_, __) => <dynamic>[],
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);
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final settings = settingsAsync.when(
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data: (data) => data,
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loading: () => null,
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error: (_, __) => null,
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);
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// Calculate subtotal
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final subtotal = items.fold<double>(
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0.0,
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(sum, item) => sum + item.total,
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);
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// Calculate tax
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final taxRate = settings?.taxRate ?? 0.0;
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final tax = subtotal * taxRate;
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// Calculate total
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final total = subtotal + tax;
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return CartTotalData(
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subtotal: subtotal,
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tax: tax,
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taxRate: taxRate,
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total: total,
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itemCount: items.length,
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);
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}
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/// Apply discount amount to total
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double applyDiscount(double discountAmount) {
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final currentTotal = state.total;
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return (currentTotal - discountAmount).clamp(0.0, double.infinity);
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}
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/// Apply discount percentage to total
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double applyDiscountPercentage(double discountPercent) {
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final currentTotal = state.total;
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final discountAmount = currentTotal * (discountPercent / 100);
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return (currentTotal - discountAmount).clamp(0.0, double.infinity);
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}
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}
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/// Cart total data model
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class CartTotalData {
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final double subtotal;
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final double tax;
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final double taxRate;
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final double total;
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final int itemCount;
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const CartTotalData({
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required this.subtotal,
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required this.tax,
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required this.taxRate,
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required this.total,
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required this.itemCount,
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});
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@override
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String toString() {
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return 'CartTotalData(subtotal: $subtotal, tax: $tax, total: $total, items: $itemCount)';
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}
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}
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