Implement cart controller

src/main/java/org/example/controller/cart/CartController.java

@@ -0,0 +1,43 @@
+package org.example.controller.cart;
+
+import java.util.Optional;
+import lombok.RequiredArgsConstructor;
+import org.example.controller.BaseController;
+import org.example.service.cart.CartService;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+@RequestMapping("/api/cart")
+@RequiredArgsConstructor
+public class CartController extends BaseController {
+  private final CartService cartService;
+
+  @GetMapping("/{user_id}")
+  public ResponseEntity<?> getAllItemsInCart(@PathVariable(value = "user_id") Long userId) {
+    return ResponseEntity.ok(cartService.getUserCart(userId));
+  }
+
+  @GetMapping("/quantity_info")
+  public ResponseEntity<?> getItemQuantityInCart(
+      @RequestParam(value = "item_id") Long itemId, @RequestParam(value = "user_id") Long userId) {
+    return ResponseEntity.ok(cartService.getItemsAmountInUsersCart(userId, itemId));
+  }
+
+  @PostMapping("/add")
+  public ResponseEntity<?> addItemToCart(
+      @RequestParam(value = "item_id") Long itemId,
+      @RequestParam(value = "user_id") Long userId,
+      @RequestParam(value = "count") Optional<Long> count) {
+    return ResponseEntity.ok(
+        cartService.addItemToCart(userId, itemId, count.isPresent() ? count.get() : 1));
+  }
+
+  @DeleteMapping("/delete")
+  public ResponseEntity<?> deleteItemFromCart(
+          @RequestParam(value = "item_id") Long itemId,
+          @RequestParam(value = "user_id") Long userId) {
+    return ResponseEntity.ok(
+            cartService.deleteItemFromCart(userId,itemId));
+  }
+}