Feat/cart model

pom.xml

@@ -33,11 +33,17 @@
             <optional>true</optional>
         </dependency>
 
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
+
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>

src/main/java/com/orderflow/ecommerce/controllers/CartController.java

@@ -0,0 +1,67 @@
+package com.orderflow.ecommerce.controllers;
+
+import com.orderflow.ecommerce.dtos.AddItemRequest;
+import com.orderflow.ecommerce.dtos.CartItemResponse;
+import com.orderflow.ecommerce.dtos.UpdateQuantityRequest;
+import com.orderflow.ecommerce.entities.Cart;
+import com.orderflow.ecommerce.entities.CartItem;
+import com.orderflow.ecommerce.repositories.CartItemRepository;
+import com.orderflow.ecommerce.repositories.CartRepository;
+import com.orderflow.ecommerce.services.CartService;
+import jakarta.validation.Valid;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+
+import java.util.Optional;
+
+@RestController
+@RequestMapping("/api/cart")
+public class CartController {
+
+    @Autowired
+    private CartService cartService;
+
+    @Autowired
+    private CartRepository repository;
+
+    @Autowired
+    private CartItemRepository itemRepository;
+
+    @GetMapping
+    public Optional<Cart> listCart() {
+        return repository.findByUserId(1L);
+    }
+
+    @PostMapping
+    public CartItemResponse addItem(@Valid @RequestBody AddItemRequest request) {
+        return cartService.addItemToCart(request);
+    }
+
+
+    @DeleteMapping("/{id}")
+    public ResponseEntity<Void> removeItem(@PathVariable Long id) {
+        repository.deleteById(id);
+        return ResponseEntity.noContent().build();
+    }
+
+    @PutMapping("/items/{id}")
+    public CartItemResponse updateItem(@PathVariable Long id, @Valid @RequestBody UpdateQuantityRequest request) {
+
+        CartItem item = itemRepository.findById(id)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Cart item not found with id: " + id));
+
+        item.setQuantity(request.quantity());
+
+        return CartItemResponse.from(itemRepository.save(item));
+    }
+
+    @DeleteMapping("/clear")
+    public ResponseEntity<Void> clearCart() {
+        cartService.clearCurrentCart();
+        return ResponseEntity.noContent().build();
+    }
+}

src/main/java/com/orderflow/ecommerce/dtos/AddItemRequest.java

@@ -0,0 +1,12 @@
+package com.orderflow.ecommerce.dtos;
+
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
+
+public record AddItemRequest(
+        @NotNull Long productId,
+        @NotNull @Positive Integer quantity,
+        @NotNull @Positive Double price
+) {
+
+}

src/main/java/com/orderflow/ecommerce/dtos/CartItemResponse.java

@@ -0,0 +1,21 @@
+package com.orderflow.ecommerce.dtos;
+
+import com.orderflow.ecommerce.entities.CartItem;
+
+public record CartItemResponse(
+        Long id,
+        Long productId,
+        String productName,
+        Integer quantity,
+        Double price
+) {
+    public static CartItemResponse from(CartItem item) {
+        return new CartItemResponse(
+                item.getId(),
+                item.getProductId(),
+                "Produto #" + item.getProductId(),
+                item.getQuantity(),
+                item.getPrice()
+        );
+    }
+}

src/main/java/com/orderflow/ecommerce/dtos/UpdateQuantityRequest.java

@@ -0,0 +1,10 @@
+package com.orderflow.ecommerce.dtos;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+
+public record UpdateQuantityRequest(
+        @NotNull(message = "A quantidade não pode ser nula")
+        @Min(value = 1, message = "A quantidade deve ser no mínimo 1")
+        Integer quantity
+) {}

src/main/java/com/orderflow/ecommerce/entities/Cart.java

@@ -0,0 +1,39 @@
+package com.orderflow.ecommerce.entities;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.NoArgsConstructor;
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+@Entity
+@Table(name = "tb_cart")
+@Getter @Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@EqualsAndHashCode(onlyExplicitlyIncluded = true)
+public class Cart implements Serializable {
+    @Serial
+    private static final long serialVersionUID = 1L;
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @EqualsAndHashCode.Include
+    private Long id;
+
+    private Instant createdAt = Instant.now();
+
+    @OneToMany(mappedBy = "cart", cascade = CascadeType.ALL)
+    private List<CartItem> items = new ArrayList<>();
+
+    @Column(name = "user_id")
+    private Long userId;
+}

src/main/java/com/orderflow/ecommerce/entities/CartItem.java

@@ -0,0 +1,29 @@
+package com.orderflow.ecommerce.entities;
+
+import com.fasterxml.jackson.annotation.JsonIgnore;
+import jakarta.persistence.*;
+import lombok.*;
+import java.io.Serializable;
+
+@Entity
+@Table(name = "tb_cart_item")
+@Getter @Setter
+@NoArgsConstructor
+@AllArgsConstructor
+public class CartItem implements Serializable {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private Integer quantity;
+    private Double price;
+
+    @JsonIgnore
+    @ManyToOne
+    @JoinColumn(name = "cart_id")
+    private Cart cart;
+
+    @Column(name = "product_id_temp")
+    private Long productId;
+}

src/main/java/com/orderflow/ecommerce/entities/Product.java

@@ -27,7 +27,4 @@ public class Product {
 
     private Integer stockQuantity;
 
-    @ManyToOne
-    @JoinColumn(name = "category_id")
-    private Category category;
 }

src/main/java/com/orderflow/ecommerce/repositories/CartItemRepository.java

@@ -0,0 +1,17 @@
+package com.orderflow.ecommerce.repositories;
+
+import com.orderflow.ecommerce.entities.CartItem;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Modifying;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+
+@Repository
+public interface CartItemRepository extends JpaRepository<CartItem, Long> {
+
+    @Modifying
+    @Transactional
+    @Query("DELETE FROM CartItem c WHERE c.cart.userId = :userId")
+    void deleteByCartUserId(Long userId);
+}