Merge pull request #8 from fmIst0/implementing-shopping-cart-model

added shopping cart implementation

src/main/java/com/bookstore/controller/BookController.java

@@ -9,6 +9,7 @@
 import jakarta.validation.Valid;
 import java.util.List;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpStatus;
 import org.springframework.security.access.prepost.PreAuthorize;
@@ -46,7 +47,7 @@ public BookDto getBookById(@PathVariable Long id) {
     @GetMapping("/search")
     @PreAuthorize("hasRole('USER')")
     @Operation(summary = "Search books", description = "Search book by specific search parameters")
-    public List<BookDto> searchBooks(BookSearchParametersDto searchParameters) {
+    public Page<BookDto> searchBooks(BookSearchParametersDto searchParameters) {
         return bookService.searchBooks(searchParameters);
     }
 

src/main/java/com/bookstore/controller/ShoppingCartController.java

@@ -0,0 +1,79 @@
+package com.bookstore.controller;
+
+import com.bookstore.dto.cartitem.CartItemCreateDto;
+import com.bookstore.dto.cartitem.CartItemUpdateDto;
+import com.bookstore.dto.shoppingcart.ShoppingCartDto;
+import com.bookstore.model.User;
+import com.bookstore.service.ShoppingCartService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import java.util.List;
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Pageable;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@Tag(name = "Shopping cart management", description = "Endpoints for managing shopping carts")
+@RequiredArgsConstructor
+@RestController
+@RequestMapping(value = "/api/cart")
+public class ShoppingCartController {
+    private final ShoppingCartService shoppingCartService;
+
+    @GetMapping(value = "/all")
+    @PreAuthorize("hasRole('ADMIN')")
+    @Operation(summary = "Get all shopping carts",
+            description = "Get all shopping carts only for admins")
+    public List<ShoppingCartDto> getAll(Pageable pageable) {
+        return shoppingCartService.findAll(pageable);
+    }
+
+    @GetMapping
+    @PreAuthorize("hasRole('USER')")
+    @Operation(summary = "Retrieve user's shopping cart",
+            description = "Retrieve user's shopping cart")
+    public ShoppingCartDto getShoppingCartByUser(Authentication authentication) {
+        User user = (User) authentication.getPrincipal();
+        return shoppingCartService.getByUserId(user.getId());
+    }
+
+    @PostMapping
+    @PreAuthorize("hasRole('USER')")
+    @Operation(summary = "Add book to the shopping cart",
+            description = "Add book to the shopping cart")
+    public ShoppingCartDto addBookToTheCart(Authentication authentication,
+                                            @RequestBody @Valid
+                                            CartItemCreateDto cartItemCreateDto) {
+        User user = (User) authentication.getPrincipal();
+        return shoppingCartService.saveBookToTheCart(user.getId(), cartItemCreateDto);
+    }
+
+    @PutMapping(value = "/cart-items/{cartItemId}")
+    @PreAuthorize("hasRole('USER')")
+    @Operation(summary = "Update quantity of a book in the shopping cart",
+            description = "Update quantity of a book in the shopping cart")
+    public ShoppingCartDto updateBookInTheCart(Authentication authentication,
+                                               @PathVariable Long cartItemId,
+                                               @RequestBody @Valid
+                                                   CartItemUpdateDto cartItemUpdateDto) {
+        User user = (User) authentication.getPrincipal();
+        return shoppingCartService.update(user.getId(), cartItemId, cartItemUpdateDto);
+    }
+
+    @DeleteMapping(value = "/cart-items/{cartItemId}")
+    @PreAuthorize("hasRole('USER')")
+    @Operation(summary = "Remove a book from the shopping cart",
+            description = "Remove a book from the shopping cart")
+    public void removeBookFromTheCart(@PathVariable Long cartItemId) {
+        shoppingCartService.deleteCartItemFromTheCart(cartItemId);
+    }
+}

src/main/java/com/bookstore/dto/cartitem/CartItemCreateDto.java

@@ -0,0 +1,14 @@
+package com.bookstore.dto.cartitem;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+
+@Data
+public class CartItemCreateDto {
+    @NotNull
+    private Long bookId;
+    @NotNull
+    @Min(1)
+    private int quantity;
+}

src/main/java/com/bookstore/dto/cartitem/CartItemResponseDto.java

@@ -0,0 +1,11 @@
+package com.bookstore.dto.cartitem;
+
+import lombok.Data;
+
+@Data
+public class CartItemResponseDto {
+    private Long id;
+    private Long bookId;
+    private String bookTitle;
+    private int quantity;
+}

src/main/java/com/bookstore/dto/cartitem/CartItemUpdateDto.java

@@ -0,0 +1,12 @@
+package com.bookstore.dto.cartitem;
+
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+
+@Data
+public class CartItemUpdateDto {
+    @NotNull
+    @Min(1)
+    private int quantity;
+}

src/main/java/com/bookstore/dto/shoppingcart/ShoppingCartDto.java

@@ -0,0 +1,11 @@
+package com.bookstore.dto.shoppingcart;
+
+import com.bookstore.dto.cartitem.CartItemResponseDto;
+import java.util.Set;
+import lombok.Data;
+
+@Data
+public class ShoppingCartDto {
+    private Long userId;
+    private Set<CartItemResponseDto> cartItemsDto;
+}

src/main/java/com/bookstore/mapper/CartItemMapper.java

@@ -0,0 +1,22 @@
+package com.bookstore.mapper;
+
+import com.bookstore.config.MapperConfig;
+import com.bookstore.dto.cartitem.CartItemCreateDto;
+import com.bookstore.dto.cartitem.CartItemResponseDto;
+import com.bookstore.model.Book;
+import com.bookstore.model.CartItem;
+import com.bookstore.model.ShoppingCart;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+
+@Mapper(config = MapperConfig.class)
+public interface CartItemMapper {
+    @Mapping(target = "id", ignore = true)
+    CartItem toEntity(CartItemCreateDto cartItemCreateDto,
+                      Book book,
+                      ShoppingCart shoppingCart);
+
+    @Mapping(source = "cartItem.book.id", target = "bookId")
+    @Mapping(source = "cartItem.book.title", target = "bookTitle")
+    CartItemResponseDto toDto(CartItem cartItem);
+}

src/main/java/com/bookstore/mapper/ShoppingCartMapper.java

@@ -0,0 +1,14 @@
+package com.bookstore.mapper;
+
+import com.bookstore.config.MapperConfig;
+import com.bookstore.dto.shoppingcart.ShoppingCartDto;
+import com.bookstore.model.ShoppingCart;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+
+@Mapper(config = MapperConfig.class, uses = CartItemMapper.class)
+public interface ShoppingCartMapper {
+    @Mapping(source = "user.id", target = "userId")
+    @Mapping(source = "cartItems", target = "cartItemsDto")
+    ShoppingCartDto toDto(ShoppingCart shoppingCart);
+}

src/main/java/com/bookstore/model/CartItem.java

@@ -0,0 +1,32 @@
+package com.bookstore.model;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@EqualsAndHashCode
+@Entity
+@Table(name = "cart_items")
+public class CartItem {
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+    @ManyToOne
+    @JoinColumn(name = "shopping_cart_id", nullable = false)
+    private ShoppingCart shoppingCart;
+    @ManyToOne
+    @JoinColumn(name = "book_id", nullable = false)
+    private Book book;
+    @Column(nullable = false)
+    private int quantity;
+}

src/main/java/com/bookstore/model/ShoppingCart.java

@@ -0,0 +1,40 @@
+package com.bookstore.model;
+
+import jakarta.persistence.CascadeType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.MapsId;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.OneToOne;
+import jakarta.persistence.PrimaryKeyJoinColumn;
+import jakarta.persistence.Table;
+import java.util.Set;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+import org.hibernate.annotations.SQLDelete;
+
+@Getter
+@Setter
+@EqualsAndHashCode
+@Entity
+@SQLDelete(sql = "UPDATE shopping_carts SET is_deleted=true WHERE id=?")
+@Table(name = "shopping_carts")
+public class ShoppingCart {
+    @Id
+    private Long id;
+    @OneToOne
+    @MapsId
+    @PrimaryKeyJoinColumn(name = "user_id")
+    private User user;
+    @ToString.Exclude
+    @EqualsAndHashCode.Exclude
+    @OneToMany(mappedBy = "shoppingCart", cascade = CascadeType.ALL, orphanRemoval = true)
+    private Set<CartItem> cartItems;
+
+    public void addCartItemToSet(CartItem cartItem) {
+        cartItems.add(cartItem);
+        cartItem.setShoppingCart(this);
+    }
+}

src/main/java/com/bookstore/repository/cartitem/CartItemRepository.java

@@ -0,0 +1,7 @@
+package com.bookstore.repository.cartitem;
+
+import com.bookstore.model.CartItem;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CartItemRepository extends JpaRepository<CartItem, Long> {
+}

src/main/java/com/bookstore/repository/shoppingcart/ShoppingCartRepository.java

@@ -0,0 +1,17 @@
+package com.bookstore.repository.shoppingcart;
+
+import com.bookstore.model.ShoppingCart;
+import java.util.Optional;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.jpa.repository.EntityGraph;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface ShoppingCartRepository extends JpaRepository<ShoppingCart, Long> {
+
+    @EntityGraph(attributePaths = {"cartItems", "cartItems.book"})
+    Page<ShoppingCart> findAll(Pageable pageable);
+
+    @EntityGraph(attributePaths = {"cartItems", "cartItems.book"})
+    Optional<ShoppingCart> findByUserId(Long id);
+}

src/main/java/com/bookstore/service/BookService.java

@@ -5,6 +5,7 @@
 import com.bookstore.dto.book.BookSearchParametersDto;
 import com.bookstore.dto.book.CreateBookRequestDto;
 import java.util.List;
+import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 
 public interface BookService {
@@ -18,7 +19,7 @@ public interface BookService {
 
     void deleteBookById(Long id);
 
-    List<BookDto> searchBooks(BookSearchParametersDto searchParameters);
+    Page<BookDto> searchBooks(BookSearchParametersDto searchParameters);
 
     List<BookDtoWithoutCategoryIds> findAllByCategoryId(Long categoryId, Pageable pageable);
 }

src/main/java/com/bookstore/service/ShoppingCartService.java

@@ -0,0 +1,19 @@
+package com.bookstore.service;
+
+import com.bookstore.dto.cartitem.CartItemCreateDto;
+import com.bookstore.dto.cartitem.CartItemUpdateDto;
+import com.bookstore.dto.shoppingcart.ShoppingCartDto;
+import java.util.List;
+import org.springframework.data.domain.Pageable;
+
+public interface ShoppingCartService {
+    List<ShoppingCartDto> findAll(Pageable pageable);
+
+    ShoppingCartDto getByUserId(Long id);
+
+    ShoppingCartDto saveBookToTheCart(Long id, CartItemCreateDto cartItemCreateDto);
+
+    ShoppingCartDto update(Long id, Long cartItemId, CartItemUpdateDto cartItemUpdateDto);
+
+    void deleteCartItemFromTheCart(Long id);
+}

src/main/java/com/bookstore/service/impl/BookServiceImpl.java

@@ -15,6 +15,8 @@
 import java.util.List;
 import java.util.Set;
 import lombok.RequiredArgsConstructor;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.stereotype.Service;
@@ -73,12 +75,13 @@ public void deleteBookById(Long id) {
     }
 
     @Override
-    public List<BookDto> searchBooks(BookSearchParametersDto searchParameters) {
+    public Page<BookDto> searchBooks(BookSearchParametersDto searchParameters) {
         Specification<Book> bookSpecification = bookSpecificationBuilder.build(searchParameters);
-        return bookRepository.findAll(bookSpecification)
+        List<BookDto> bookDtos = bookRepository.findAll(bookSpecification)
                 .stream()
                 .map(bookMapper::toDto)
                 .toList();
+        return new PageImpl<>(bookDtos, Pageable.ofSize(10), bookDtos.size());
     }
 
     @Override