feature: user can change quantity and remove products

src/app/core/models/cart.model.ts

@@ -13,3 +13,8 @@ export interface CartModel {
   totalPrice: number;
   items: CartItemModel[];
 }
+
+export interface CartItemRequest {
+  productId: number;
+  quantity: number;
+}

src/app/core/services/cart-service.ts

@@ -1,8 +1,9 @@
 import { HttpClient, HttpErrorResponse } from "@angular/common/http";
 import { effect, inject, Injectable, signal } from "@angular/core";
 import { API_URL } from "../tokens/api-url-tokens";
-import { CartModel } from "../models/cart.model";
+import { CartItemModel, CartItemRequest, CartModel } from "../models/cart.model";
 import { AuthService, AuthState } from "@app/features/auth/services/auth-service";
+import { Cart } from "@app/shared/components/cart/cart";
 
 @Injectable({
   providedIn: "root",
@@ -36,4 +37,12 @@ export class CartService {
       },
     });
   }
+
+  updateCart(data: CartItemRequest) {
+    return this.http.patch<CartModel>(this.apiUrl + "/cart", data);
+  }
+
+  removeFromCart(productId: number) {
+    return this.http.delete<CartModel>(this.apiUrl + "/cart", { body: { productId: productId } });
+  }
 }

src/app/shared/components/cart-item/cart-item.html

@@ -7,17 +7,19 @@
       <p class="text-sm truncate max-w-30 mt-2">{{ cartItem.title }}</p>
       <div class="mt-auto flex space-x-4 items-center text-gray-600">
         <p class="text-sm">Rs. {{ cartItem.price }} x {{ cartItem.quantity }}</p>
-        <button class="active:scale-80" title="Remove Item">
+      </div>
+    </div>
+    <div class="flex flex-col justify-between">
+      <div class="mt-2 flex space-x-2 items-center">
+        <p class="font-medium">Rs. {{ cartItem.subtotal }}</p>
+        <button (click)="removeProduct()" class="active:scale-80 py-0" title="Remove Item">
           <lucide-angular [name]="TrashIcon" class="w-3" />
         </button>
       </div>
-    </div>
-    <div class="flex flex-col">
-      <p class="mt-2 font-medium flex-1">Rs. {{ cartItem.subtotal }}</p>
       <div class="flex max-h-7 text-xs text-center text-gray-700">
-        <button class="btn btn-ghost py-1! px-2 rounded-r-none!">-</button>
-        <p class="py-1 px-2 border-y border-y-gray-300">{{ cartItem.quantity }}</p>
-        <button class="btn py-1! btn-ghost px-2 rounded-l-none!">+</button>
+        <button (click)="decrementQty()" class="btn btn-ghost py-1! px-2 rounded-r-none!">-</button>
+        <p class="w-7 text-center py-1 px-2 border-y border-y-gray-300">{{ cartItem.quantity }}</p>
+        <button (click)="incrementQty()" class="btn py-1! btn-ghost px-2 rounded-l-none!">+</button>
       </div>
     </div>
   </div>

src/app/shared/components/cart-item/cart-item.ts

@@ -1,5 +1,5 @@
-import { Component, Input } from "@angular/core";
-import { CartItemModel } from "@app/core/models/cart.model";
+import { Component, EventEmitter, Input, Output, signal } from "@angular/core";
+import { CartItemModel, CartItemRequest } from "@app/core/models/cart.model";
 import { LucideAngularModule, Trash } from "lucide-angular";
 
 @Component({
@@ -10,5 +10,25 @@ import { LucideAngularModule, Trash } from "lucide-angular";
 })
 export class CartItem {
   @Input() cartItem!: CartItemModel;
+  @Output() qtyChangeEvent = new EventEmitter<CartItemRequest>();
+  @Output() productDeleteEvent = new EventEmitter<number>();
   TrashIcon = Trash;
+
+  incrementQty() {
+    if (this.cartItem.quantity < 10) {
+      this.cartItem.quantity += 1;
+      this.qtyChangeEvent.emit({ productId: this.cartItem.id, quantity: this.cartItem.quantity });
+    }
+  }
+
+  decrementQty() {
+    if (this.cartItem.quantity > 1) {
+      this.cartItem.quantity -= 1;
+      this.qtyChangeEvent.emit({ productId: this.cartItem.id, quantity: this.cartItem.quantity });
+    }
+  }
+
+  removeProduct() {
+    this.productDeleteEvent.emit(this.cartItem.id);
+  }
 }

src/app/shared/components/cart/cart.html

@@ -4,9 +4,17 @@
   } @else if (authService.authState() === AuthState.Loading) {
   <li><a class="block h-full w-full">Loading</a></li>
   } @else {
-  <ol>
+  <ol
+    [class.pointer-events-none]="isLoading()"
+    [class.opacity-40]="isLoading()"
+    [class.cursor-block]="isLoading()"
+  >
     @for (item of cart.items; track item.id) {
-    <app-cart-item [cartItem]="item" />
+    <app-cart-item
+      (qtyChangeEvent)="updateProductQty($event)"
+      (productDeleteEvent)="removeProduct($event)"
+      [cartItem]="item"
+    />
     }
   </ol>
 

src/app/shared/components/cart/cart.ts

@@ -1,7 +1,9 @@
-import { Component, computed, inject, Input } from "@angular/core";
-import { CartModel } from "@app/core/models/cart.model";
+import { Component, computed, inject, Input, signal } from "@angular/core";
+import { CartItemModel, CartItemRequest, CartModel } from "@app/core/models/cart.model";
 import { CartItem } from "../cart-item/cart-item";
 import { AuthService, AuthState } from "@app/features/auth/services/auth-service";
+import { CartService } from "@app/core/services/cart-service";
+import { finalize, tap } from "rxjs";
 
 @Component({
   selector: "app-cart",
@@ -12,6 +14,31 @@ import { AuthService, AuthState } from "@app/features/auth/services/auth-service
 export class Cart {
   @Input() cart!: CartModel;
 
+  isLoading = signal(false);
+
   protected readonly authService = inject(AuthService);
+  protected readonly cartService = inject(CartService);
   protected readonly AuthState = AuthState;
+
+  updateProductQty(cartItem: CartItemRequest) {
+    this.isLoading.set(true);
+
+    this.cartService
+      .updateCart(cartItem)
+      .pipe(finalize(() => this.isLoading.set(false)))
+      .subscribe((cartdata) => {
+        this.cart = cartdata;
+      });
+  }
+
+  removeProduct(productId: number) {
+    this.isLoading.set(true);
+
+    this.cartService
+      .removeFromCart(productId)
+      .pipe(finalize(() => this.isLoading.set(false)))
+      .subscribe((cartData) => {
+        this.cart = cartData;
+      });
+  }
 }