package com.ecommerce.dto.response;

import com.ecommerce.model.Cart;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.math.BigDecimal;
import java.util.List;
import java.util.stream.Collectors;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class CartResponse {
    private String id;
    private String userId;
    private List<CartItemDto> items;
    private BigDecimal totalPrice;
    private int totalItems;
    
    @Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public static class CartItemDto {
        private String productId;
        private String productName;
        private String productImage;
        private BigDecimal price;
        private int quantity;
        private BigDecimal subtotal;
    }
    
    public static CartResponse fromCart(Cart cart) {
        List<CartItemDto> itemDtos = cart.getItems().stream()
                .map(item -> CartItemDto.builder()
                        .productId(item.getProductId())
                        .productName(item.getProductName())
                        .productImage(item.getProductImage())
                        .price(item.getPrice())
                        .quantity(item.getQuantity())
                        .subtotal(item.getSubtotal())
                        .build())
                .collect(Collectors.toList());
        
        return CartResponse.builder()
                .id(cart.getId())
                .userId(cart.getUserId())
                .items(itemDtos)
                .totalPrice(cart.getTotalPrice())
                .totalItems(cart.getTotalItems())
                .build();
    }
}