Create update quantity component for changing cart item quantity

frontend/components/global/product-detail/UpdateQuantity.vue

@@ -0,0 +1,87 @@
+<script lang="ts" setup>
+// import
+
+import useGetProduct from "~/composables/api/product/useGetProduct";
+import useAddCartItem from "~/composables/api/orders/useAddCartItem";
+import type { ProductVariantProvideType } from "~/pages/product/[id].vue";
+
+// provide / inject
+
+const { selectedVariant } = inject(
+    "productVariant"
+) as ProductVariantProvideType;
+
+// state
+
+const route = useRoute();
+const id = route.params.id as string | undefined;
+
+const { refetch: refetchProduct } = useGetProduct(id);
+const { mutateAsync: addCartItem, isPending: isAddCartItemPending } = useAddCartItem();
+
+const timer = ref<NodeJS.Timeout | null>(null);
+
+const quantity = ref(1);
+
+// methods
+
+const onInput = (e: any) => {
+    const value = Number(e.target.value);
+    if (value > 0 && value <= selectedVariant.value!.in_stock) {
+        quantity.value = value;
+    } else {
+        quantity.value = 1;
+    }
+};
+
+watch(
+    () => quantity.value,
+    (newValue) => {
+        if (timer.value) clearTimeout(timer.value);
+        timer.value = setTimeout(async () => {
+            await addCartItem({ id: selectedVariant.value!.id, quantity: newValue });
+            await refetchProduct();
+        }, 350);
+    }
+);
+
+watch(selectedVariant, (newValue) => {
+    quantity.value = newValue!.cart_quantity;
+});
+
+// lifecycle
+
+onMounted(() => {
+    quantity.value = selectedVariant.value!.cart_quantity;
+});
+
+</script>
+
+<template>
+    <NumberFieldRoot
+        class="rounded-full border-slate-200 border-[1.5px] flex items-center bg-white gap-4 p-4"
+        v-model="quantity"
+        :min="1"
+        :max="selectedVariant!.in_stock"
+    >
+        <NumberFieldIncrement class="cursor-pointer">
+            <Icon name="ci:plus" class="**:stroke-slate-500 size-5" />
+        </NumberFieldIncrement>
+        <div class="relative">
+            <div
+                :class="isAddCartItemPending ? 'opacity-100' : 'opacity-0'"
+                class="w-[40px] h-[25px] flex-center transition-all absolute bg-white"
+            >
+                <Icon :name="'svg-spinners:180-ring-with-bg'" class="size-[25px]" />
+            </div>
+            <NumberFieldInput
+                @input="onInput"
+                :class="!isAddCartItemPending ? 'opacity-100' : 'opacity-0'"
+                class="transition-all field-sizing-content w-[40px] h-[25px] bg-transparent text-center outline-none typo-label-md text-black"
+            />
+        </div>
+        <NumberFieldDecrement class="cursor-pointer">
+            <Icon name="ci:minus" class="**:stroke-slate-500 size-5" />
+        </NumberFieldDecrement>
+    </NumberFieldRoot>
+</template>