99 lines
2.2 KiB
Dart
99 lines
2.2 KiB
Dart
/// Domain Entity: Cart Item
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///
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/// Represents a single item in a shopping cart.
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library;
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/// Cart Item Entity
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///
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/// Contains item-level information:
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/// - Product reference
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/// - Quantity
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/// - Pricing
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class CartItem {
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/// Unique cart item identifier
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final String cartItemId;
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/// Cart ID this item belongs to
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final String cartId;
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/// Product ID
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final String productId;
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/// Quantity ordered
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final double quantity;
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/// Unit price at time of adding to cart
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final double unitPrice;
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/// Subtotal (quantity * unitPrice)
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final double subtotal;
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/// Timestamp when item was added
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final DateTime addedAt;
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const CartItem({
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required this.cartItemId,
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required this.cartId,
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required this.productId,
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required this.quantity,
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required this.unitPrice,
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required this.subtotal,
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required this.addedAt,
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});
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/// Calculate subtotal (for verification)
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double get calculatedSubtotal => quantity * unitPrice;
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/// Copy with method for immutability
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CartItem copyWith({
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String? cartItemId,
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String? cartId,
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String? productId,
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double? quantity,
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double? unitPrice,
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double? subtotal,
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DateTime? addedAt,
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}) {
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return CartItem(
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cartItemId: cartItemId ?? this.cartItemId,
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cartId: cartId ?? this.cartId,
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productId: productId ?? this.productId,
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quantity: quantity ?? this.quantity,
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unitPrice: unitPrice ?? this.unitPrice,
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subtotal: subtotal ?? this.subtotal,
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addedAt: addedAt ?? this.addedAt,
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);
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}
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@override
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bool operator ==(Object other) {
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if (identical(this, other)) return true;
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return other is CartItem &&
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other.cartItemId == cartItemId &&
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other.cartId == cartId &&
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other.productId == productId &&
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other.quantity == quantity &&
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other.unitPrice == unitPrice &&
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other.subtotal == subtotal;
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}
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@override
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int get hashCode {
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return Object.hash(
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cartItemId,
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cartId,
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productId,
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quantity,
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unitPrice,
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subtotal,
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);
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}
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@override
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String toString() {
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return 'CartItem(cartItemId: $cartItemId, productId: $productId, '
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'quantity: $quantity, unitPrice: $unitPrice, subtotal: $subtotal)';
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}
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}
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